Distillation Equipment

Solvent Recovery Distillation Plant

Mechotech designs and manufactures the Solvent Recovery Distillation Plant as turnkey process equipment that reclaims process solvent — from extraction, washing, or reaction operations — and returns it to a reusable grade instead of it being discharged as waste. Built around a straightforward still or multi-stage column paired with a condenser and receiver, the plant is engineered as a closed-loop system with explosion-proof electricals, inert-gas blanketing, and vapour-containment measures suited to flammable solvents, so recovered solvent can be routed straight back into the process with minimal fresh-solvent make-up.

Spent solvent — typically carrying dissolved solids, moisture, colour bodies, or residual product — is charged to the still and heated so the clean solvent fraction vaporises away from the non-volatile residue, then condenses back to a purified liquid in the condenser for collection. Where the process handles a single solvent, a simple single-stage still is sufficient; where two or more solvents must be split and each recovered to its own specification, a multi-stage column with reflux is added. Because the recovered solvents are frequently flammable (ethanol, hexane, acetone, and similar), the plant is engineered as a sealed, closed-loop system with nitrogen blanketing, flame-proof instrumentation, and vent/vapour-recovery provisions built in from the design stage rather than added afterward. Mechotech fabricates the still, column (where fitted), condenser, and receiver train in SS 316L (or a process-appropriate grade) with electropolished product-contact surfaces, and controls heating, vacuum, and cut collection under PLC-based automation, with capacity and configuration engineered to the customer's solvent system and recovery target.

Process Flow

Technical Specifications

Technology	Solvent recovery distillation — closed-loop reclamation of process solvent
Working Principle	Spent solvent is vaporised away from non-volatile residue, then condensed and returned to storage for reuse
Configuration	Single-stage still (single solvent) or multi-stage column with reflux (multi-solvent split)
Operating Temperature	Configured to the solvent's boiling range and heat sensitivity
Operating Vacuum	Configurable for heat-sensitive solvents and energy efficiency
Product-contact Material	SS 316L (or process-appropriate grade), electropolished
Safety Design	Flame-proof electricals, nitrogen/inert-gas blanketing, sealed vapour-containment circuit
Solvent Recovery	Typical target above 95 percent, depending on solvent stream and feed quality
Automation	PLC-based control of heating, vacuum, and cut collection with batch data logging
Capacity	Configured to requirement — pilot to commercial
Utilities	Steam/thermic fluid or electric heating, cooling water, nitrogen, power, compressed air
Compliance	WHO-GMP, Schedule M hygienic design; CPCB-aligned solvent-recovery and emissions practice
Final Output	Purified, reusable process solvent with concentrated residue for disposal

Plant Capacities

Scale	Typical Duty	Still/Column Configuration	Operating Mode
Pilot	Solvent-recovery process validation	Single-stage still	Atmospheric or vacuum (configurable)
Small commercial	Single-solvent recovery for reuse	Single-stage still with condenser	Atmospheric or vacuum (configurable)
Commercial multi-solvent	Recovery train splitting two or more solvents	Multi-stage column with reflux	Vacuum-capable for heat-sensitive solvents

Still/column size, condenser duty, and vacuum rating are engineered to the specified solvent system, feed volume, and recovery target; exact capacity is confirmed during process design.

Manufacturing Process

Spent Solvent Collection

Solvent recovered from extraction, washing, or reaction stages is routed to a dedicated feed tank, with streams segregated by solvent type to protect recovery quality.

Pre-Filtration

Coarse solids, marc, or sludge are removed ahead of the still to protect heating surfaces and reduce fouling during distillation.

Still Charging & Heating

The filtered feed is charged to the recovery still and heated so the clean solvent fraction vaporises while non-volatile residue and dissolved solids remain behind.

Vacuum Application (where required)

For heat-sensitive or high-boiling solvents, vacuum is drawn to lower the operating temperature and reduce thermal stress on the solvent and any residual product.

Condensation & Solvent Capture

Solvent vapour is condensed in a closed shell-and-tube condenser under inert-gas blanketing, capturing the recovered solvent while minimising vapour loss to atmosphere.

Purity Verification & Cut Collection

Recovered solvent is checked against its reuse specification and routed to the appropriate receiver, with off-spec cuts diverted for reprocessing.

Residue Discharge

Concentrated bottoms residue is drained from the still base for disposal or further recovery, and the vessel is prepared for the next batch.

Closed-Loop Return to Process

Purified solvent is transferred to storage for direct reuse in the originating extraction, washing, or reaction step, closing the solvent loop.

Major Plant Equipment

Spent-solvent feed tank
Pre-filtration system
Recovery still / reboiler
Multi-stage rectification column (where fitted)
Reflux divider and control (multi-stage configuration)
Shell-and-tube condenser
Nitrogen/inert-gas blanketing system
Recovered-solvent receiver vessels
Vacuum system (for vacuum-mode operation)
Residue collection and discharge system
Flame-proof electricals and instrumentation
PLC/HMI control panel

Plant Output

Recovered/reusable process solventConcentrated residue for disposal or further recovery

Applications

Recovery of extraction solvent for reuse in botanical and herbal extraction plants
Reclamation of washing and rinsing solvents from pharmaceutical process lines
Recovery of reaction-stage solvents in API and fine-chemical manufacturing
Closed-loop solvent management for flammable solvents such as ethanol, hexane, and acetone
Reduction of fresh-solvent purchase and hazardous-waste disposal volumes
Solvent recovery in nutraceutical concentrate and standardised-extract production
Recovery trains supporting CPCB-aligned emission and solvent-management compliance
Pilot-scale solvent-recovery validation ahead of commercial plant sizing

Key Features

Closed-Loop Recovery Design
The still, condenser, and receiver form a sealed circuit engineered to return recovered solvent directly to the process, minimising vapour loss and fresh-solvent make-up.
Explosion-Proof, Flammable-Solvent-Ready Construction
Flame-proof electricals, nitrogen blanketing, and vapour-containment provisions are built into the design for safe handling of flammable process solvents.
Single or Multi-Stage Recovery
A simple single-stage still handles single-solvent recovery, while a multi-stage column with reflux is added where two or more solvents must be split and recovered separately.
Vacuum Operation for Sensitive Solvents
Configurable vacuum lowers operating temperature to protect heat-sensitive solvents and any entrained product residue from thermal degradation.
GMP-Compliant Construction
Electropolished SS 316L product-contact surfaces meet WHO-GMP and Schedule M requirements, and the vessel is cleaned in place (CIP) between batches.
PLC-Based Recovery Control
Heating, vacuum, and cut collection are managed under automated control with batch data logging for repeatable recovery quality and CPCB-aligned traceability.

Frequently Asked Questions

What does a Solvent Recovery Distillation Plant do?

It reclaims spent process solvent — from extraction, washing, or reaction operations — by distilling it so the clean solvent vaporises away from dissolved solids, moisture, and residue, then condensing it back into a purified liquid ready for reuse. This closes the solvent loop instead of the spent solvent being discharged as hazardous waste.

Is this a single still or a multi-stage column?

It depends on the solvent system. Where a single solvent needs to be recovered, a straightforward single-stage still with a condenser is typically sufficient. Where two or more solvents must be separated and each recovered to its own specification, Mechotech adds a multi-stage rectification column with reflux — closer in design to a Solvent Rectification system — sized to the required split.

How is flammable-solvent safety handled?

Because recovered solvents such as ethanol, hexane, and acetone are commonly flammable, the plant is engineered from the design stage with flame-proof electricals, nitrogen/inert-gas blanketing, and a sealed vapour-containment circuit, rather than these being added as an afterthought.

What recovery rate can be expected?

Recovery depends on the solvent stream, feed contamination level, and cut specification, but a typical target is above 95 percent solvent recovery. Vacuum operation, feed pre-filtration, and correctly sized condensing capacity all contribute to hitting that target consistently.

Where does this plant fit relative to Mechotech's other distillation equipment?

This plant is purpose-built for reclaiming and reusing an existing process solvent, as opposed to the Fractional Distillation Unit, which is built to split a feed mixture into several distinct product fractions. Where extremely high purity or difficult multi-solvent splits are required, Mechotech's Solvent Purification and Solvent Rectification systems add further polishing and fractionation stages.

What capacity can Mechotech supply?

Still/column size, condenser duty, and vacuum rating are configured to the solvent system, feed volume, and recovery target, from pilot-scale units for process validation to larger commercial recovery trains. We recommend validating recovery parameters on a pilot system before scaling.

Does Mechotech provide turnkey design, installation, and commissioning?

Yes. Mechotech engineers, fabricates, installs, and commissions the complete still, condenser, receiver train, and safety systems as a single accountable scope, with documentation to support GMP and regulatory qualification.

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Solvent Recovery Distillation Plant