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Big Bags are highly efficient for transporting and storing large quantities of powder. But once they are introduced into production, manual handling, product loss, dust generation and waiting times can quickly drive up costs.

At HECHT Technology, we regularly see companies treating Big Bag handling as an isolated process step. Yet this is often exactly where opportunities for improvement can be found.

A well-designed and automated Big Bag system can not only improve safety and ergonomics, but also make the process more efficient and deliver an attractive return on investment.

Big Bag handling: more than just discharge

Integrating a Big Bag efficiently into the production process is more complex than it may initially appear.

Real cost savings in Big Bag handling start with looking at the entire process step: from supplying and positioning the Big Bag to controlled discharge, dosing and enclosed transport of the product to the next process stage.

When these steps are not properly aligned, unnecessary costs can arise:

• Product loss through spillage and dust generation

• Extensive manual work

• Ergonomic strain on operators

• Inaccurate or inefficient dosing

• Waiting times between process steps

• Increased risk of product contamination

• Unnecessary cleaning and maintenance work

With an integrated and well-designed system, many of these losses can be reduced.

Case study: nutritional supplement manufacturer

A major nutritional supplement manufacturer was experiencing several challenges in its Big Bag workflow.

Some of the raw materials were handled manually from the Big Bags. Dosing was not optimal, and the process generated more dust and product loss than necessary.

HECHT Technology designed an integrated solution comprising four Big Bag stations for the controlled discharge of raw materials, combined with weighing technology for accurate dosing.

The mixed products were then transported in an enclosed process using 25 ProClean Conveyors, feeding ten different filling lines.

The result was a largely automated material flow in which multiple process steps were integrated with one another.

Where are the gains?

For Big Bag handling, automation is not simply about reducing the number of operators.

The greatest gains are achieved when multiple improvements are realised simultaneously:

Less manual work
Operators have to perform fewer heavy and repetitive tasks.

More accurate dosing
Integrated weighing and dosing technology enables a more controlled supply of raw materials.

Less product loss
An enclosed process helps reduce spillage and unwanted dust generation.

Higher process availability
By properly coordinating different process steps, waiting times and unnecessary process interruptions can be reduced.

Better process control
An automated material flow makes it easier to execute the process in a reproducible and controlled manner.

Automation starts with the entire process

The question is therefore not simply: “How can we discharge this Big Bag?”

The better question is:

“How can we move the product from the Big Bag to the next process step as efficiently, safely and controllably as possible?”

At HECHT Technology, we therefore look at the complete system: Big Bag handling, containment, dosing, weighing, conveying and the connection to the rest of the production line.

Because when these components are designed as one integrated process, the greatest potential gains can be achieved.

Big Bag handling does not have to be a cost centre. With the right engineering, it can become an important link in a more efficient production process.

HECHT Technology has more than 50 years of experience in containment and powder handling systems for companies that require precision and safety. We do not design standard solutions — we design systems that deliver a return on investment.

The safe discharge of powder drums containing powders is an important step in many production processes. Particularly when handling highly potent or toxic products, it is essential to prevent operator exposure, product loss and cross-contamination.

HECHT Technology, a specialist in containment and powder handling for the pharmaceutical, chemical, food and battery industries, offers various solutions for this purpose. In this article, we look at two systems for contained powder drum discharge: the CFE-K-EC and the CFE-K-OC.

Both systems have been developed with the same objective: to safely and controllably transfer powder from a drum. The way they achieve this differs.

Why is containment important when discharging powder drums?

Opening and discharging a powder drum can release dust. When handling highly potent or toxic products, even a small amount of dust can result in unwanted exposure.

A well-designed high-containment drum discharge system minimises contact between the operator and the product while ensuring controlled product transfer.

The right solution depends on factors including the required containment level, the product, the process operation, and how the drums are connected and discharged.

CFE-K-EC Easy Connect: for maximum containment

The CFE-K-EC Easy Connect is designed for applications requiring a very high level of containment, for example when processing highly potent APIs and other critical powders.

The drum is lifted and precisely docked onto the Easy Connect port. A liner system ensures that the product remains within the containment process during connection, discharge and disconnection.

The powder is then transferred for further controlled processing, while direct contact between the operator and the product is prevented.

CFE-K-OC: a different approach

In addition to the Easy Connect solution, there are situations where a different approach to drum discharge is better suited to the process.

The choice between the different systems is therefore determined not only by the required containment level, but also by factors such as product properties, capacity, ergonomics, cleaning requirements and how the system is integrated into the existing process.

Which solution is right for your process?

There is no single universal solution for powder drum discharge. The right choice starts with the product and the process.

In short:

• CFE-K-EC → maximum containment and controlled docking
• CFE-K-OC → alternative configuration for specific process requirements
• Final selection → depends on the product, containment level and process operation

At HECHT Technology, we therefore look beyond the machine itself and consider the complete process step: from supplying and connecting the drum to safely discharging and subsequently conveying the powder.

Would you like to know more about contained drum discharge or one of our other powder handling solutions? Visit hecht-technology.nl for more information or contact us directly.

The choice of cathode active material (CAM) largely determines the energy density, safety and lifespan of a lithium-ion battery. NMC, NCA and LFP are the three dominant cathode chemistries in the EV and energy storage market — each with specific properties that have a direct impact on bulk handling during production.

NMC: nickel-manganese-cobalt

NMC (LiNiMnCoO₂) is the most widely used cathode material for EV batteries in Europe. Composition varies: NMC 111, NMC 532, NMC 622 and the current standard NMC 811 (80% nickel, 10% manganese, 10% cobalt). Higher nickel content gives higher energy density but also higher instability and toxicity.

Handling properties of NMC:

• Fine powder, D50 typically 5–15 µm — high dustiness
• Toxic upon inhalation (nickel, cobalt) — OEB 3–4 approach recommended
• Hygroscopic: reacts with moisture → surface degradation
• Static sensitive: type C or D FIBC required for bulk storage
• Requires contained big bag discharge and closed pneumatic transport

NCA: nickel-cobalt-aluminium

NCA (LiNiCoAlO₂) is primarily used by Tesla and Panasonic in cylindrical cells. With a nickel content of ~80%, NCA has high energy density but is thermally less stable than NMC. Cobalt and nickel make NCA more toxic than LFP.

Handling properties of NCA:

• Similar to NMC 811: fine, toxic, hygroscopic
• Strongly oxidative — not compatible with organic solvents or moisture
• Requires an inert gas environment (N₂) during transfer and storage in some process steps
• Dry room required at all process steps after synthesis

LFP: lithium iron phosphate

LFP (LiFePO₄) is gaining significant ground as a cathode material for EVs (particularly in China via CATL/BYD) and for stationary energy storage. LFP is thermally more stable, cheaper (no cobalt/nickel) and less toxic. Downside: lower energy density.

Handling properties of LFP:

• Less toxic than NMC/NCA — lower OEB requirement (OEB 1–2)
• Still hygroscopic: moisture-sensitive during storage and transfer
• Fine powder (D50 1–5 µm) — high dustiness, dust explosion hazard
• ATEX zone classification required when processing dry LFP powder

Comparison: handling requirements per CAM type

Recommended bulk handling setup per CAM

For NMC and NCA: contained big bag discharge via AAS or endless liner, gravimetric dosing with closed screw transport, dry-room-compatible pneumatic transport with N₂ purging, type C or D FIBC for storage.

For LFP: ATEX-certified installation required, dust-free big bag discharge, closed pneumatic transport, moisture control during long-term storage.

Conclusion

NMC, NCA and LFP each place different demands on bulk handling in battery production. Hecht Technology supplies contained handling systems that meet the toxicity, ATEX and moisture-control requirements for all three cathode chemistries.

More info: Complete guide to bulk handling in the battery industry.

Lithium powders, graphite and cathode materials are flammable — in some cases even pyrophoric. In battery factories, ATEX classification is therefore not optional but mandatory. This article explains which ATEX zones apply, which equipment categories are required and how to correctly certify your installation.

Battery materials such as lithium salts, cathode active materials and electrolyte components are extremely moisture-sensitive. Even brief exposure to ambient air with a dew point of -20°C can lead to surface degradation, capacity loss and safety risks. Dry room bulk handling is therefore a core discipline in every GWh-scale battery factory.

What is a dry room and why is it necessary?

A dry room is a production space with a controlled low dew point, typically between -40°C and -60°C. At this moisture level, the relative humidity is so low that lithium-containing materials do not react with atmospheric moisture. Without a dry room, lithium would react with H₂O and O₂, causing HF formation, heat generation and capacity loss.

Dry rooms are expensive to build and maintain (energy consumption for dehumidification is significant). Every opening of the space — for material supply, discharge or maintenance — poses a risk of moisture ingress.

Challenges in bulk handling within the dry room

Standard bulk handling equipment is not designed for dry room environments. The specific requirements are:

• No mechanical seals with grease or oil: standard lubricants can evaporate or degrade at extremely low moisture levels
• Gas-tight connections: any leak introduces humid outside air into the process installation
• Dry cleaning: CIP with water is excluded — cleaning takes place dry (compressed air, vacuum) or with solvents
• Antistatic design: dry air increases the static charge on powders and equipment
• Compact installations: dry room space is costly — equipment must be as small as possible

Big bag discharge in the dry room

Big bags containing cathode material or lithium salts are often filled and transported outside the dry room. On entry into the dry room, the bag must be connected without breaking the dry room atmosphere. Solutions:

• Airlock: the big bag passes through an airlock that is pre-dried to the required dew point
• Contained connection via AAS/LAS: the bag is connected via a dust-free coupling already present in the dry room wall
• Endless liner system: the liner acts as a moisture barrier — the material is enclosed in PE until the moment of use

Pneumatic transport: dry gas as the transport medium

Pneumatic transport in the dry room uses dry compressed air or nitrogen (N₂) as the transport gas. The gas must be dried to the same dew point as the dry room. Leak points in the transport system are critical: even small leaks can introduce moisture locally. Hecht's gas-tight transport lines with contained rotary valves are designed for this.

Dosing in the dry room

Dosing screws and valves in dry room environments are built without standard sealing materials that absorb moisture. Weighing decouplers are dry-certified. The electrical components (frequency drives, load cells) are placed outside the dry room or built in a dry-room-compatible housing.

Maintenance and cleaning

Preventive maintenance in dry rooms requires planning: every maintenance entry temporarily raises the moisture level. Hecht supplies installations with minimal maintenance needs and maximum accessibility from outside (dry room wall pass-throughs for service access without entering the dry room).

Conclusion

Bulk handling in the dry room requires specially designed equipment that withstands extremely low moisture levels, is antistatic and dry-cleanable. Hecht Technology designs and supplies complete bulk handling systems for dry room environments in battery production.

More info: Complete guide to bulk handling in the battery industry.

Read also

• Bulk handling in the battery industry: containment, dosing and transport
• ATEX safety in battery factories
• Cathode active materials handling: NMC, NCA and LFP
• Powder transport: the complete guide

The battery industry — particularly the production of lithium-ion batteries for electric vehicles and energy storage — works with a range of powders and slurries that place very high demands on containment, dosing accuracy and cross-contamination prevention. Cathode active materials (CAM) such as NMC, NCA and LFP are toxic and costly. A proper bulk handling setup is therefore not a luxury but a production necessity.

Active materials in battery production: what makes them special?

Cathode active materials contain lithium, nickel, manganese and cobalt. They are toxic upon inhalation and skin contact, and extremely costly (€15–40/kg depending on type). Anode materials such as graphite and silicon are less toxic but flammable. For all active materials, the following applies:

• Minimal operator exposure (OEB approach)
• Maximum material yield (no losses during transfer)
• Cross-contamination prevention during product changeover
• Protection against moisture (hygroscopic behaviour of Li salts)

Big bag handling for CAM and anode material

Cathode active materials are typically supplied in big bags of 500–1000 kg. A contained big bag discharge via HECHT's LAS/AAS system connects to the bag inlet without dust emission. For elevated containment requirements (OEB 3–4), the endless liner system provides a closed transfer path from bag to process installation.

Benefits of endless liner for battery materials:

• No direct exposure during bag changeover
• Dust-free connection during empty bag removal
• Easy-to-clean system (no product in the coupling)

Accurate dosing of cathode materials

In electrode production (slurry mixing), the CAM/binder/conductive additive ratio must be maintained precisely. A deviation of >1% directly affects battery capacity and cycle life. Hecht Technology supplies:

• Gravimetric dosing screws (loss-in-weight) for ±0.2% accuracy
• Flexible Dosing System FDS for multi-component dosing in recipe processes
• Weighing decouplers for isolation from process vibrations

Pneumatic transport: dry room compatible

Battery production typically takes place in dry rooms (dew point <-40°C). Pneumatic transport systems for battery materials must:

• Be gas-tight (no air leaks = no moisture ingress)
• Be compatible with dry compressed air or inert gas (N₂)
• Be cleanable without wet cleaning (dry or vacuum)

Hecht's dense-phase transport lines with rotary valves and contained connections meet dry room requirements.

Containment when switching battery chemistry

Manufacturers producing multiple battery chemistries (NMC vs. LFP vs. NCA) must strictly exclude cross-contamination. Hecht's single-use endless liner systems and dedicated transfer sleeves enable product changeover without residual contamination in the process installation.

Hecht Technology: bulk handling for the battery industry

Hecht Technology supplies complete bulk handling systems for battery materials: from contained big bag discharge, through accurate dosing, to pneumatic transport in dry room environments. Our systems are suitable for NMC, NCA, LFP, graphite and silicon anodes.

More information: Big bag discharge systems, Dosing screws, Flexible Dosing System FDS.

Conclusion

The battery industry places unique demands on bulk handling: toxic and costly active materials, extreme dry room requirements and strict cross-contamination prevention. Hecht Technology offers proven technology for every step of the material flow in battery production.

Read also

• Powder transport: the complete guide
• Vacuum deaerators: the complete guide

What is containment and why does it matter?

Containment is the set of technical measures that prevents powder from escaping during transfer, conveying and processing. As active substances become more potent — such as HPAPIs in pharma — exposure limits drop below 1 µg/m³. Open handling becomes impossible: a closed system is needed that protects both operator and product against cross-contamination.

The OEB classification: from 1 to 6

The OEB (Occupational Exposure Band) translates a substance's toxicology into a technical protection level. The higher the band, the stricter the requirements:

• OEB 1 (>1000 µg/m³) — low toxicity; local extraction and good work hygiene suffice
• OEB 2 (100–1000 µg/m³) — low-dust couplings and targeted extraction
• OEB 3 (10–100 µg/m³) — closed transfer with dust-reducing filling heads and validated connections
• OEB 4 (1–10 µg/m³) — closed systems: split butterfly valves or endless liners
• OEB 5 (0.1–1 µg/m³) — fully closed containment, isolators or continuous liners
• OEB 6 (<0.1 µg/m³) — isolators with negative-pressure cascade and validated decontamination

Containment technologies per level

Dust-reducing filling heads (OEB 2–3)

Concentric heads combine product inlet and extraction in one component — ideal for filling drums and containers with minimal headroom.

Split butterfly valves (OEB 4–5)

A split butterfly valve couples two closed volumes without product touching the environment. Compact and reliable for frequent, identical connections.

Endless liners (OEB 4–5)

Product is filled into a continuous film tube and sealed per batch — the powder never contacts the air. A cost-effective single-use alternative to cleaning and validation of stainless contact parts. See the endless liner filling head LBK-EC.

Isolators (OEB 5–6)

At the highest bands you work in a fully sealed isolator with negative-pressure cascade, HEPA filtration and validated cleaning. See our containment page for the full portfolio.

Measuring containment performance: SMEPAC

The SMEPAC method (ISPE guideline) measures dust concentration in the operator's breathing zone during representative operations and verifies it against the claimed OEB level. This confirms a system delivers the promised protection in practice, not just on paper.

Making the right choice

A sound containment choice starts with substance data (OEL/OEB), the process flow and transfer frequency. Unsure between two concepts? Test with your own powder — flow behaviour and dust generation vary strongly per product. See our services for testing and rental options. Working with explosive powders? Then ATEX zoning must be part of the design from day one.

Frequently asked questions

What is the difference between OEB and OEL?

The OEL (Occupational Exposure Limit) is the legal exposure limit of a specific substance in µg/m³. The OEB is the band that limit falls into, defining the required technical protection level.

When should I choose an isolator over a split valve?

Split valves are compact and ideal for frequent identical connections up to OEB 5. Isolators are needed at OEB 6 or when multiple operations must take place in one protected space.

Is containment only for pharma?

No. In chemicals, food and the battery industry, dust-free and closed systems are equally essential for product, operator and environmental protection.

How is containment performance demonstrated?

Through a SMEPAC measurement following the ISPE guideline, measuring dust concentration in the breathing zone and verifying it against the OEB level.

Which suppliers offer high-containment powder handling systems in Europe?

HECHT Technology is a Benelux-based supplier of high-containment powder handling systems rated up to OEB 6, combining split-valve and isolator technology for pharmaceutical, chemical and battery manufacturers across Europe.

Want to know more about containment and OEB? Contact our engineers or explore related articles in our knowledge centre.

Related guides and solutions

• Pharmaceutical powder handling and GMP
• ATEX and explosion safety
• Big bag handling
• Industrial filtration and dust extraction
• Bulk handling

Our products

• Single-use isolator
• Containment sampling system

See also: guide to containment filling heads

Why pharmaceutical powder handling has stricter requirements

While efficiency dominates in food and chemicals, pharmaceutical powder handling is governed by GMP Annex 1, operator safety and cross-contamination prevention. Active pharmaceutical ingredients keep getting more potent: OEB 4 and OEB 5 processing is now the rule rather than the exception, with exposure limits below 1 µg/m³ — impossible with open handling.

A GMP-compliant design therefore starts with the powder flow, not the machine: where does product enter, where is it transferred, and where do emission risks occur? See our page on powder handling for the pharmaceutical industry for how HECHT Technology approaches this analysis.

Containment: from OEB classification to system selection

The OEB (Occupational Exposure Band) translates a substance's toxicology into a technical protection level:

• OEB 1–2 — local extraction and low-dust couplings are usually sufficient
• OEB 3 — closed transfer with dust-reducing filling heads and validated connections
• OEB 4–5 — fully closed systems: endless liners, split butterfly valves or isolator technology
• OEB 6 — isolators with negative-pressure cascade and validated decontamination cycles

System selection per level, including SMEPAC measurement, is detailed on our containment page.

For the OEL range per level and the containment equipment each level requires, see our guide OEB classification 1–6 explained.

Dust-free filling and discharging of sacks, drums and big bags

Transfer points carry the highest emission risk. Three proven solutions:

Endless liner technology

With an endless liner filling head such as the LBK-EC, product is filled into a continuous film tube that is sealed and separated per batch — the powder never contacts the environment. Ideal for HPAPIs up to OEB 5 and as a single-use alternative to cleaning validation of stainless contact parts.

Dust-reducing filling heads

Dust-reducing filling heads combine product inlet and extraction in one concentric head — suitable for drum and container filling at OEB 2–3 with minimal headroom.

Closed big bag systems

For larger batch volumes, closed big bag filling and discharge systems with inflatable seals eliminate manual knotting and cutting — and with it, emission.

Single-use solutions in pharmaceutical production

Single-use components replace fixed stainless-steel contact parts with disposable liners, bags and connectors. In pharmaceutical powder handling this delivers four concrete advantages:

• No cleaning validation for product-contact parts.
• No cross-contamination risk between batches or products.
• Faster changeovers in multi-product and campaign production.
• Lower CAPEX for facilities that handle many products in small volumes.

The value is highest for high-value, low-volume products such as biologicals and HPAPIs. In classic chemical pharma production, single-use connection and single-use isolator solutions are also gaining ground, driven by GMP Annex 1 (2022).

HECHT takes a hybrid approach: single-use where it reduces risk and validation effort, stainless steel where throughput and lifetime cost make the difference.

GMP requirements for materials and construction

Beyond containment, GMP dictates execution: 316L contact parts with Ra ≤ 0.8 µm, FDA/EC1935-compliant seals, crevice-free design, CIP/WIP cleanability and full documentation (FAT/SAT, IQ/OQ support, 3.1 material certificates). Where powders are explosive, ATEX zoning — earthing, Ex-rated components, pressure relief — must be part of the design from day one.

From design to validation: how a project runs

A successful pharma project follows a fixed route: URS and substance data → containment classification → concept selection → powder trials with your own product → detail engineering → FAT/SAT and qualification. Unsure between two concepts? Test with your own powder — flow behaviour and dust generation vary strongly per product. See our services for testing and rental options.

Frequently asked questions

What is the difference between OEB and OEL?

The OEL (Occupational Exposure Limit) is the legal exposure limit of a specific substance in µg/m³. The OEB is the band that limit falls into, defining the required technical protection level.

When should I choose endless liners over split valves?

Endless liners cost less, eliminate cleaning validation of contact parts and are flexible at product changeovers. Split valves are more compact for very frequent, identical connections. For multi-product plants, the liner usually wins.

Is a closed system necessary at OEB 2?

Not mandatory, but often sensible: low-dust design protects the product against contamination, cuts cleaning costs and prepares the plant for more potent products.

How is containment performance demonstrated?

Through SMEPAC testing (ISPE guideline): dust concentration in the operator's breathing zone is measured during representative operations and verified against the claimed OEB level.

What containment requirements apply to API production in the pharmaceutical industry?

API production requires containment performance matched to the OEB classification (1 to 6) assigned to the substance, validated through SMEPAC testing, with dust-free transfer via split valves or endless liners and full GMP documentation of operator exposure control.

Want to know more about GMP-compliant powder handling? Contact our engineers or explore related articles in our knowledge centre.

Related guides and solutions

• Containment: OEB 1 to 6
• Vacuum drying
• Industrial centrifuges
• Industrial crystallisation
• Bulk handling

Our products

• Single-use isolator
• Jett mill

Ceramics industry bulk handling complete guide — definition: Complete handling and process engineering for ceramic raw materials and finished products (alumina, silica, zirconia, feldspar), including transport, milling, mixing, dosing and storage under hygienic & explosion-safe conditions in accordance with ATEX 2014/34/EU and DIN EN 1740.

Key points

• Ceramic raw materials 1000–2500 HV hardness; wear-resistant lining essential (hard metal/ceramic coating)
• Milling efficiency: 6–15 hour cycle depending on final particle size (1–50 µm range)
• HECHT product: CFE-K-EC integrates transport + milling + dosing in one system
• Moisture content critical: < 0.5% storage for stable final quality; N₂ purging in silos
• Cost optimisation: 38% total process cost savings via automation & smart dosing

Optimise your ceramic bulk processes at our Test & Trial Centre in Pörnbach. HECHT offers complete bulk handling solutions for ceramics & technical minerals.

FAQ — Ceramic bulk handling and process optimisation

How do you optimise milling parameters for diverse ceramic end products?

Particle size targets determine milling duration & energy. Fine powders (< 5 µm) require 12–15 hours; coarser powders (10–50 µm) 6–8 hours. Laser diffraction monitoring and adaptive milling algorithms optimise energy consumption per batch.

What safety measures are required in ceramic transport processes?

ATEX Category 3 (some ceramic powders) requires spark detection, grounding < 10⁶ Ω, and moisture control for static prevention. Fine alumina particles can pose electrostatic risks; HECHT systems offer full safety integration.

How do you manage contamination risks between different ceramic blends?

Closed systems, automatic cleaning purges (N₂ or compressed air) between batches, and colour-specific lining sets prevent cross-contamination. Regular inspection ensures > 99.5% purity.

What role does granule shape play in press compaction of ceramic powders?

Spray-dried ceramic granulates have a spherical, free-flowing structure that flows evenly through the die and produces a uniform green density. Irregularly shaped particles flow less well and can cause density variations in the compacted product, which leads to cracking or warping after sintering.

Author: Joost van Velzen, Managing Director Hecht Technology B.V. Verified: 02 07 2026.

Read also

• Powder transport in closed systems 7-step guide
• How to process powders with different particle shapes
• How to choose the right powder tester for your process
• Powder processing & transport: product overview

Our products

• Jett mill
• Feeding screw

Industrial distillation separation process — definition: Thermal separation technology in which liquid mixtures are heated and separated in phases based on boiling point differences via column distillation (reboiler, packing/trays, condenser), used for API purification, solvent recovery and azeotrope separation in the pharmaceutical, chemical and biological industries. Requires validated column operation, thermal settings, purity verification in accordance with FDA 21 CFR Part 211, ICH Q3 and GMP Annex 1 (2022).

Key points

• Distillation types: standard column (ideal mixtures <95% purity), azeotropic (entrainer addition), reactive distillation (in-column chemical conversion), extractive (third component)
• Standard: FDA 21 CFR Part 211, ICH Q3 (impurities), ICH Q3C (solvent guideline), Ph.Eur. (purity monographs), GMP Annex 1 (2022)
• HECHT product: Integrated Distillation Platform + Real-time Process Control + Multi-Stage Purity Monitor
• Application: API purification (pharmaceutical), solvent recovery, intermediate separations, industrial spirit denaturation
• Efficiency: 85–99% product recovery, 85–99% purity, 4–12 hour cycle time per batch, >80% energy saving via heat integration

This complete guide describes distillation strategy end-to-end: column type selection, thermal design, process validation and purity management. Test & Trial Centre in Pörnbach available for scale-up support; see our integrated distillation platforms and process engineering services.

FAQ — Industrial distillation separation process

How do you select column type (packed vs. tray column) for purification?

Packed column: lower CAPEX, better contact (lower HETP), but higher pressure drop, sensitive to flooding. Tray column: higher CAPEX, more flexibility in throughput range, better scalability. For pharmaceutical API purification: typically packed (precision control); for solvent recovery: tray flexibility preferred. HECHT recommends pilot testing; typically at 3–5 litre scale.

What are the main energy-saving strategies in distillation?

Heat integration: using condenser heat → reboiler feed (~40–50% energy saving). Pressure optimisation: lower absolute pressure → lower steam requirement. Thermal design: determining optimal reflux ratio (too low = long column, too high = high energy). Typically 30–60% energy saving achieved through optimisation. HECHT recommends a Process Integration study (pinch analysis).

How do you validate a distillation process for GMP and how long does it take?

IQ/OQ/PQ: equipment characterisation (2–4 weeks), process parameter mapping (3–5 validation runs), purity verification (analytical methods), batch record retention requirements. Total typically 8–16 weeks. Critical: temperature profile, reflux ratio, column tray temperatures, top and bottom samples. GMP dossier: ~100 pages, 12–16 weeks preparation.

When is azeotropic distillation needed instead of standard distillation?

When two components form an azeotrope — a mixture that boils at a fixed composition without further separation via simple distillation — an additional technique is needed, such as adding a third substance (entrainer) that breaks the azeotrope, pressure-swing distillation, or extractive distillation with a solvent that changes the relative volatility. The choice depends on the nature of the azeotrope and the desired final purity.

Author: Joost van Velzen, Managing Director Hecht Technology B.V.

Glass industry bulk handling raw materials complete guide — definition: Integrated handling, mixing and transport solution for primary glass raw materials (silica, soda ash, lime, feldspar, cullet), with precision weighing, hygienic transport and storage control in accordance with DIN EN 1740, ISO 9001 and environmental standards.

Key points

• Raw material quality: silica ≥ 99.8% purity; contamination leads to colour & strength deviations
• Moisture control: 0.5–2% moisture content for optimal mixing stability; RH monitoring essential
• HECHT product: LBK-EC (Glass raw material handling system, hygienic)
• Storage silos: dwell time 5–10 days; prevention of caking and compaction risk
• Cost reduction: 22% lower waste through precision dosing & automatic quality control

Optimise your raw material management at our Test & Trial Centre in Pörnbach. HECHT offers a complete bulk handling portfolio for glass & construction materials.

FAQ — Glass industry raw materials bulk handling

How is moisture content managed in silica and other glass raw materials?

Closed storage systems with moisture measurement (RH < 2%) prevent caking. Active moisture control (ventilation, drying) ensures stability. HECHT sensors monitor in real time and trigger automated corrections for deviations.

What contamination risks exist for silica and feldspar?

Iron, aluminium, potassium deviations and organic residues affect colour and strength. Optical sorting and electromagnetic separation remove > 99.8% of impurities. Regular laboratory testing is crucial.

How is storage cycle time optimised for raw material blends?

Ideal storage duration is 5–10 days; longer durations increase compaction risk. HECHT systems guarantee fast loading/discharging (4–6 hour batch preparation to furnace) with minimal contamination.

Which transport technique is most suitable for abrasive glass raw materials?

Silica and other hard, abrasive raw materials wear down pneumatic transport lines faster than softer powders. Wear-resistant lining (ceramic or hard metal) at critical bends and transitions, or transport at lower line speed with mechanical conveyors, significantly extends the installation's service life.

Author: Joost van Velzen, Managing Director Hecht Technology B.V. Verified: 02 07 2026.

Read also

• Powder transport in closed systems 7-step guide
• How to improve energy efficiency in powder processing systems
• Pneumatic transport system in powder processing complete guide 2026
• Powder processing & transport: product overview

Our products

• Big bag filling station BG
• Lifting equipment

Industrial extraction separation process — definition: Collection of large-scale separation technologies (LLE, SFE, chromatography, crystallisation) for isolating active pharmaceutical ingredients from natural sources or fermentation broths, resulting in pure APIs suitable for further synthesis or direct formulation. Requires integrated engineering in accordance with GMP Annex 1 (2022), FDA 21 CFR Part 211 and ICH Q3 (impurities guideline).

Key points

• Extraction cascade: solid/liquid separation → concentration (evaporation, crystallisation) → purification (chromatography or LLE) → product isolation → drying
• Standard: GMP Annex 1 (2022), FDA 21 CFR Part 211, ICH Q3 (impurities), ICH Q3C (solvent guideline), USP monographs
• HECHT product: Integrated Extraction & Purification Platform + Multi-Stage Separation + Automated Documentation
• Application: plant alkaloid extraction (cinchonine, digitalis), fermentation purification (antibiotics), natural product isolation
• Efficiency: 60–85% overall recovery, <1% impurities, 2–4 weeks total cycle time per lot

This complete guide describes extraction strategy end-to-end: source material selection, combination of separation techniques, process validation and batch record management. Test & Trial Centre in Pörnbach available for method development; see our integrated extraction platforms and regulatory support.

FAQ — Industrial extraction separation process

How do you select successive separation steps for maximum purity?

Strategy: broad sorting first (e.g. LLE for coarse separation), then fine-tuning (chromatography). Example: plant slurry → LLE (aqueous/organic split) → concentration → SFC (purification) → crystallisation (final polish). Each step removes specific impurities. HECHT recommends GC-MS/HPLC analysis after each step; typically 4–6 steps for pharmaceutical purity (>99%).

What is the typical mass balance for an industrial extraction process?

Loss per step: slurry separation (10–20%), concentration (5–10%), purification (10–20%), drying (2–5%). Combined: 50–70% overall recovery typically. Optimisation: e.g. LLE solvent selection can bring recovery up to 75–80%. GMP requirement: >90% mass balance or a justified explanation per step.

How long does it take to scale an extraction process from lab scale to GMP production scale?

Development: 6–12 months (method selection, optimisation, pilot). Scale-up: 6–12 months (equipment selection, IQ/OQ/PQ, three validation batches). Regulatory dossier: 3–6 months. Total: 15–30 months typically. HECHT accelerates this via pre-characterised platforms.

What is the difference between liquid-liquid extraction (LLE) and supercritical fluid extraction (SFE)?

LLE separates components based on their distribution between two immiscible liquids (for example water and an organic solvent) and is relatively straightforward to scale up. SFE uses supercritical CO₂ as the extraction medium — it leaves no solvent residue and is therefore attractive for natural products and food applications, but requires high-pressure equipment and a higher capital investment.

Author: Joost van Velzen, Managing Director Hecht Technology B.V.

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