Horizontal Rotary-Type Extraction
Horizontal Rotary-Type Extraction
Mechotech engineers and manufactures the Rotary Extractor as turnkey process equipment for herbal, oleoresin and botanical extraction lines. Mechotech’s process graphic shows a rotating horizontal vessel in which prepared feed is loaded, solvent is added, the vessel rotates gently during an extraction hold, the solvent-and-extract solution (miscella) is drawn off, and the spent solids are discharged, as a single-pass batch cycle. Mechotech’s article on rotary extractors describes the wider rotary family, in which botanical material is moved through extraction zones while the extraction medium passes through it, often on the counter-current principle, for continuous or semi-continuous processing. The configuration for a project, a rotating batch vessel or a continuous rotary system, is confirmed in design.
The Rotary Extractor is built in SS 316L (or a process-appropriate grade) with electropolished product-contact surfaces and integrated instrumentation, so it can be cleaned in place between batches and operated under PLC-based control. Feed material is loaded into the extraction vessel and contacted with solvent under process-controlled conditions, with the rotating configuration engineered to the confirmed feedstock and target extraction performance during the design stage rather than fixed in advance. The extractor is one stage of a line: the miscella it produces goes on to filtration, vacuum evaporation and solvent recovery, and the spent solids can be desolventised before disposal. Capacity is configured to the customer’s requirement, from pilot-scale systems for process validation to larger commercial installations with modular expansion, and every unit is delivered with full documentation to support GMP qualification.
Process Flow
Technical Specifications
| Equipment Type | Rotary Extractor — rotating-vessel solid–liquid extractor |
|---|---|
| Technology | Rotary solid-liquid extraction |
| Working Principle | Prepared feed and solvent are contacted in a rotating vessel with gentle rotary action; the miscella is drawn off and the spent solids are discharged (per Mechotech’s process graphic) |
| Operating Cycle | Single-pass batch cycle with no recycle loop, as the process graphic shows; continuous or semi-continuous rotary configurations are described in Mechotech’s article and are confirmed in design |
| Feed | Prepared botanical material; particle size is set to the feedstock, since the article notes too coarse a feed penetrates poorly and too fine a feed raises flow resistance |
| Extraction Medium | Solvent system selected for the feedstock and target compounds; confirmed during process development |
| Product-contact Material | SS 316L (or process-appropriate grade), electropolished |
| Automation | PLC-based control; the article notes rotary systems suit PLC and SCADA automation |
| Cleaning | CIP-capable, with spray-ball connections |
| Downstream Line | Filtration, vacuum evaporation, solvent recovery and, where required, spent-solids desolventising and drying |
| Capacity | Configured to requirement — pilot-scale to larger commercial installations with modular expansion |
| Compliance | GMP hygienic design; full documentation for qualification |
Plant Capacities
| Scale | Typical Use | Operating Cycle |
|---|---|---|
| Pilot | Process validation on the client’s feedstock | Batch cycle |
| Production | Commercial batch extraction | Batch cycle, or continuous / semi-continuous rotary configuration confirmed in design |
| Large production | High-volume extraction campaigns | Configured to feed bulk density, extraction kinetics and downstream capacity |
Vessel size, rotation and cycle time are sized to the feed’s bulk density, moisture, extraction kinetics and solvent-to-solid ratio; exact capacity is configured to your batch size and campaign plan, and no fixed volumes are quoted on this page.
Manufacturing Process
Feed Charging
Prepared feed material is loaded into the extraction vessel to begin the extraction cycle; feed preparation and particle size are set to the feedstock.
Solvent Contact
Solvent is introduced to the vessel and contacts the feed material under process-controlled conditions.
Extraction Hold
The feed and solvent are held in contact for the process-defined duration under gentle rotation, allowing target compounds to transfer into the solvent phase.
Miscella Drawoff
The solvent-and-extract solution (miscella) is drawn off from the vessel once the batch has reached its target extraction level and is sent on for filtration, concentration and solvent recovery.
Vessel Discharge
Spent, solvent-wet solids are discharged from the vessel, where a desolventising stage can recover residual solvent before disposal, and the extractor is cleaned in place for the next cycle.
Major Plant Equipment
- Rotary extraction vessel
- Solvent charging system
- Miscella drawoff and collection manifold
- Vessel discharge system
- CIP skid and spray-ball connections
- PLC-based control panel
- Downstream filtration, vacuum evaporation and solvent recovery equipment (separate Mechotech pages)
Plant Output
Applications
- Spice and oleoresin extraction, such as chilli, paprika, black pepper, turmeric, ginger, cardamom, coriander, cumin and fenugreek, where feed properties and validated processes allow (per Mechotech’s article)
- Selected herbal materials, such as ashwagandha, amla, moringa, green tea and licorice (per the article)
- Natural colour, nutraceutical and phytochemical extraction lines (per the article)
- Extraction ahead of Mechotech’s evaporation, solvent-recovery and spray-drying equipment
Key Features
Gentle Rotary Action
Mechotech’s process graphic shows feed and solvent held in contact under gentle rotation, with the vessel then emptied through miscella drawoff and spent-solids discharge.
Part of a Complete Extraction Line
The extractor is designed with the filtration, evaporation, solvent recovery and drying that follow it, because the article stresses that the extractor is only one stage of the plant.
Configuration Confirmed in Design
A rotating batch vessel or a continuous rotary system can be configured; the choice follows bulk density, moisture, extraction kinetics and the target campaign.
Hygienic, CIP-Capable Construction
Electropolished SS 316L product-contact surfaces and CIP connections, with documentation to support GMP qualification.
PLC-Based Control
PLC-based control of the cycle, with SCADA integration where the plant requires production data and traceability.
Scalable Capacity
The extractor is sized to the customer’s requirement, from pilot-scale validation through to commercial capacity, with modular expansion as production grows.
Frequently Asked Questions
Does Mechotech supply the complete Rotary Extractor?
What capacities are available for the Rotary Extractor?
Which industries use the Rotary Extractor?
How is the Rotary Extractor configured for a specific feedstock?
What is a rotary extractor?
Is this a batch or a continuous extractor?
What materials is rotary extraction suited to?
What happens to the miscella and the spent solids?
How does a rotary extractor compare with the other extractors?
What information is needed to specify one?
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