Extraction Equipment

Counter-Current Extraction (CCE) Plant

Counter-Current Extraction (CCE) moves feed material and solvent through a series of connected extraction stages in opposing directions, so the freshest, most concentrated solvent gradient always meets the material at the stage where it will do the most good. This staged, opposing-flow arrangement sustains a higher concentration gradient across the whole extraction train than a single-vessel soak can achieve, giving solvent-efficient, consistent recovery at commercial throughput. Mechotech engineers turnkey counter-current extraction systems configured to each feedstock, solvent and target compound.

In a counter-current extraction plant, prepared feed advances progressively through multiple linked extraction stages while solvent is introduced at the discharge end and flows in the opposite direction. At each stage the solids contact a solvent stream that is progressively fresher than the miscella it displaces, so the leanest solvent finishes off the most-exhausted material and the richest miscella is drawn off where it has contacted the freshest feed. This opposing-flow, multi-stage arrangement is what distinguishes CCE from a single-pass or single-vessel batch soak, and it is the same underlying principle Mechotech applies across its counter-current and continuous extraction equipment. Mechotech fabricates the extraction stages, solids-conveying mechanism, solvent distribution manifold and miscella collection train in SS 304 with product-contact SS 316L to hygienic, GMP-oriented standards, with PLC/SCADA control of feed rate, solvent flow and stage residence time. Capacity and stage configuration are engineered to the customer's feedstock and target throughput.

Process Flow

Technical Specifications

Technology	Counter-Current Extraction (CCE) — multi-stage, opposing-flow solid-liquid extraction
Working Principle	Feed and solvent move through multiple linked stages in opposing directions, maximising the concentration-gradient driving mass transfer at each stage
Stage Configuration	Multiple sequential extraction stages, number and residence time configured to feedstock and target yield
Solids Conveying	Screen, basket or auger conveying mechanism (configurable to feedstock)
Solvent	Water, ethanol, hexane, hydro-alcoholic or other process-grade solvents (as applicable to the target compound)
Product-contact Material	SS 304 / SS 316L, electropolished
Miscella Handling	In-line filtration and clarification ahead of downstream concentration
Solvent Recovery	Integrated recirculation of recovered solvent to the counter-current stage train
Automation	PLC/SCADA (configurable) with feed-rate, solvent-flow and stage-residence-time control
Capacity	Configured to process requirement — pilot to commercial, pilot validation recommended before scale-up
Utilities	Electric power, solvent-handling and recovery utilities, compressed air
Compliance	GMP / WHO-GMP hygienic design
Final Output	Concentrated miscella; spent solids discharged per the configured stage cycle

Manufacturing Process

Feed preparation & intake

Prepared feed material is metered into the first extraction stage at a controlled rate, sized to the feedstock's particle size and bed permeability.

Staged solids conveying

A conveying mechanism — screen, basket or auger, selected to the feedstock — advances the solids through successive extraction stages at a controlled residence time per stage.

Counter-current solvent introduction

Solvent is introduced at the discharge end of the stage train and flows opposite to the solids' direction of travel, establishing the opposing-flow concentration gradient that defines counter-current operation.

Stage-wise contact & mass transfer

At each stage, solvent percolates through or contacts the solid bed, progressively dissolving target compounds as the material advances toward discharge and the solvent advances toward the richest end.

Miscella drawoff

Concentrated solvent-and-extract solution (miscella) is drawn off at the feed-entry end, where it has contacted the freshest material and reached its highest concentration for that stage configuration.

Spent-solids discharge

Extracted, solvent-wet solids are discharged from the far end of the stage train for downstream desolventising or disposal, as configured to the process.

Miscella filtration & clarification

Drawn-off miscella passes through filtration to remove fines before being routed to downstream concentration and solvent-recovery stages.

Solvent recovery & recirculation

Recovered solvent from downstream evaporation is returned to the extraction train's solvent-in stage, sustaining the counter-current loop and reducing fresh-solvent consumption.

Major Plant Equipment

Feed intake and metering system
Multi-stage extraction body
Solids-conveying mechanism (screen, basket or auger, configurable)
Counter-current solvent distribution manifold
Miscella drawoff and collection manifold
In-line miscella filtration
Spent-solids discharge system
Solvent recovery and recirculation interface
PLC/SCADA automation

Plant Output

Concentrated miscella (extract-in-solvent)Spent solids / de-oiled marc, discharged continuously or per configured cycle

Turnkey Line

Counter-Current Extractor

See the complete end-to-end plant and the equipment at each stage.

Applications

Multi-stage botanical and herbal extraction requiring solvent-efficient recovery
Oilseed and vegetable-oil extraction at commercial throughput
Oleoresin and spice-extract production with staged solvent contact
Nutraceutical actives extraction where consistent, gradient-driven recovery is required
Protein-meal and de-oiled cake processing
Scale-up production lines moving from single-vessel batch soak to staged counter-current operation
Applications evaluated case-by-case for feedstock permeability and stage count

Key Features

Opposing-flow concentration gradient
Solvent and feed travel in opposite directions across the stage train, maximising the concentration gradient driving mass transfer at every stage compared with a single-vessel soak.
Multi-stage, configurable train
The number of extraction stages, conveying mechanism and per-stage residence time are configured to the feedstock, target yield and required throughput.
Solvent-efficient recovery
Because the leanest solvent meets the most-exhausted material, less fresh solvent is typically needed per unit of extract recovered than in repeated single-vessel soaks.
Integrated solvent recovery loop
Recovered solvent is recirculated to the counter-current stage train, reducing fresh-solvent consumption and supporting closed-loop operation.
Hygienic, GMP-oriented build
Product-contact parts in SS 316L with smooth, CIP-friendly finishes support pharmaceutical, nutraceutical and food-grade production.
Full automation & stage control
PLC/SCADA control of feed rate, solvent flow and per-stage residence time with batch/run logging supports repeatable, traceable operation.

Frequently Asked Questions

What is Counter-Current Extraction (CCE)?

Counter-Current Extraction moves feed material and solvent through a series of linked extraction stages in opposing directions, so the freshest solvent always meets the material where it will do the most good — the leanest solvent finishes off the most-exhausted material, and the richest miscella is drawn off where it has contacted the freshest feed. This staged, opposing-flow arrangement sustains a stronger concentration gradient across the extraction train than a single-vessel soak.

How does counter-current extraction work?

Prepared feed is conveyed progressively through multiple extraction stages while solvent is introduced at the discharge end and flows in the opposite direction. At each stage, the solids contact a progressively fresher solvent stream, and target compounds dissolve into the solvent as the material advances. Concentrated miscella is drawn off at the feed-entry end, and spent solids discharge at the far end, with recovered solvent recirculated back into the counter-current loop.

How is this different from Mechotech's Counter-Current Extractor and Continuous Extractor?

Mechotech's Counter-Current Extractor and Continuous Extractor apply the same opposing-flow principle described on this page. This Counter-Current Extraction (CCE) page sets out the full technical specification — stage configuration, materials, automation and solvent-recovery detail — for that family of equipment; the underlying extraction mechanism is shared across all three.

What are the advantages of counter-current extraction compared with a single-vessel batch soak?

Because the concentration gradient is maximised at every stage rather than relying on a single equilibrium soak, counter-current extraction typically achieves more complete recovery per unit of solvent used, and a multi-stage train can sustain steadier throughput at commercial scale than repeated single-vessel batch cycles.

What feedstocks and solvents suit counter-current extraction?

It suits solid-liquid extraction applications where feedstock permeability supports staged solvent contact, including botanical and herbal actives, oilseed and vegetable-oil extraction, oleoresins and spice extracts, and protein-meal processing, using solvents ranging from water and ethanol to hexane and hydro-alcoholic blends depending on the target compound. Solvent selection and stage count are evaluated per feedstock.

What capacity and stage configuration can Mechotech supply?

Stage count, conveying mechanism and solvent-handling capacity are configured to the feedstock, particle size and target throughput, from pilot-scale systems for process validation to commercial-scale trains. We recommend validating extraction yield and stage residence time on a pilot system before scaling to full commercial operation.

What material of construction and compliance does Mechotech use?

Product-contact parts are built in SS 316L with SS 304 for structural and non-contact areas, finished to smooth, CIP-friendly, hygienic standards. Systems follow GMP and WHO-GMP hygienic design principles, with documentation to support qualification.

Does Mechotech provide turnkey design, manufacture, installation and commissioning?

Yes. Mechotech designs, engineers and fabricates the complete counter-current extraction system, including the multi-stage extraction body, solids-conveying mechanism, solvent distribution and recovery loop, and PLC/SCADA automation, and installs and commissions it as a single performance-verified turnkey plant. We support the project through scale-up, operator training and process validation.

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Counter-Current Extraction (CCE) Plant