Extraction Equipment

Pressurized Liquid Extraction Plant

Pressurized Liquid Extraction (PLE), also known as accelerated solvent extraction, uses common liquid solvents at elevated temperature under enough pressure to keep them liquid well above their normal boiling points. The combination of heat and pressure dramatically speeds up mass transfer, dissolves target compounds faster and uses far less solvent than conventional soaking or reflux methods. It works with water, ethanol, methanol, hydro-alcoholic blends and other food- or pharma-grade solvents, and suits a wide range of botanicals and process residues. Mechotech engineers turnkey PLE systems configured to each feedstock, solvent and target compound.

Pressurized Liquid Extraction works by holding a solvent above its atmospheric boiling point while pressure keeps it in the liquid phase. Higher temperature lowers solvent viscosity and surface tension and disrupts analyte-matrix interactions, so extraction is faster, yields improve and solvent consumption and cycle times fall sharply compared with maceration or Soxhlet. Selectivity can be adjusted by choosing the solvent, its polarity and the operating temperature, giving flexible control over which compounds are recovered. Mechotech fabricates the extraction cells, heaters, high-pressure pumps and solvent-handling circuit in SS 304 with product-contact SS 316L to hygienic, GMP-oriented standards, with integrated solvent recovery. PLC/SCADA automation manages temperature, pressure, flow and purge cycles, and capacity is configured from pilot to commercial scale.

Technical Specifications

Technology	Pressurized Liquid Extraction (PLE) / Accelerated Solvent Extraction (ASE)
Working Principle	Liquid solvent held above its atmospheric boiling point under pressure to accelerate mass transfer and dissolution
Operating Temperature	Configurable elevated range above the chosen solvent's boiling point
Operating Pressure	Configurable, set to keep the solvent liquid at the operating temperature
Solvent	Water, ethanol, methanol, hydro-alcoholic and other process-grade solvents (as applicable)
Operating Modes	Static and dynamic flow-through (configurable)
Product-contact Material	SS 304 / SS 316L
Automation	PLC/SCADA (configurable) with recipe management, purge cycles and batch logging
Capacity	Configured to process requirement - pilot to commercial
Utilities	Steam / thermic fluid or electric heating, cooling water, nitrogen / inert gas, power, compressed air
Solvent Recovery	Integrated evaporation and recovery for solvent reuse (configurable)
Compliance	GMP / cGMP hygienic design
Final Output	Liquid extract; optional concentrate or dried powder via downstream recovery and drying

Manufacturing Process

Feed loading

Sized botanical material is loaded into the extraction cell or vessel and sealed. Uniform particle size promotes even solvent penetration and consistent yield.

Solvent fill & pressurisation

The selected solvent is pumped into the cell and pressure is raised to keep it liquid at the target temperature. Pressure eliminates boiling and helps the solvent enter the matrix pores.

Heating

The cell is heated to the chosen operating temperature above the solvent's normal boiling point. Elevated temperature accelerates diffusion and weakens compound-matrix binding.

Static / dynamic extraction

The pressurised hot solvent contacts the matrix in a static hold or continuous flow-through mode. Target compounds dissolve rapidly into the solvent phase.

Extract flush & collection

Fresh solvent flushes the loaded extract from the cell into a collection vessel. A controlled rinse maximises recovery of dissolved actives.

Purge & depressurisation

An inert-gas or nitrogen purge clears residual solvent from the cell and the system is depressurised. This recovers solvent held in the spent solids and prepares for the next step.

Solvent recovery & concentration

The extract is routed to evaporation where solvent is recovered for reuse and the product is concentrated. Recovered solvent lowers operating cost and waste.

Finishing & drying

The concentrate can be dried to powder by spray or vacuum drying downstream. The system is then flushed and readied for the next batch.

Applications

Nutraceutical and dietary-supplement actives
Phytochemicals including polyphenols, alkaloids and flavonoids
Essential oils, oleoresins and natural colours
Pharmaceutical botanical actives and standardised extracts
Food, beverage and natural flavour ingredients
Cosmetic and personal-care botanical extracts
Environmental and residue extraction from solids
R&D, pilot studies and process scale-up

Key Features

Fast extraction, short cycles
Elevated temperature and pressure accelerate mass transfer, cutting extraction times sharply versus maceration, percolation or Soxhlet reflux.
Low solvent consumption
Efficient contact and flush recovery reduce solvent use per batch, and integrated recovery returns solvent for reuse to lower cost and waste.
Flexible solvent selectivity
Water, ethanol, methanol and hydro-alcoholic blends can be used and matched to the target, so polarity and temperature together tune what is extracted.
High and repeatable yields
Controlled pressure keeps solvent liquid and drives it into the matrix, delivering consistent, high recovery across batches.
Hygienic, GMP-oriented build
Product-contact parts in SS 316L with CIP-friendly, smooth-finish design support pharmaceutical, nutraceutical and food-grade production.
Full automation with safety interlocks
PLC/SCADA control of temperature, pressure, flow and purge, with interlocks suited to solvent handling, ensures safe, repeatable, traceable operation.

Frequently Asked Questions

What is Pressurized Liquid Extraction?

Pressurized Liquid Extraction, also called accelerated solvent extraction, is a technique that uses ordinary liquid solvents at elevated temperature while pressure keeps them liquid above their normal boiling points. This combination extracts target compounds much faster and with less solvent than traditional soaking or reflux methods, using water, ethanol, methanol or other process-grade solvents.

How does pressurized liquid extraction work?

The extraction cell is filled with solvent and pressurised so the solvent stays liquid, then heated above its atmospheric boiling point. The heat lowers solvent viscosity and surface tension and weakens the bonds holding target compounds in the matrix, so the compounds dissolve quickly. Fresh solvent then flushes the loaded extract to collection, an inert-gas purge recovers residual solvent, and the system depressurises.

What are the advantages of PLE compared with conventional extraction?

PLE is far faster than maceration, percolation or Soxhlet reflux because heat and pressure speed up mass transfer. It uses significantly less solvent per batch, gives high and repeatable yields, and integrates solvent recovery to cut cost and waste. Selectivity is flexible because the solvent, its polarity and the temperature can all be adjusted to the target compound.

What can a pressurized liquid extraction plant process?

It handles a broad range of botanicals and solid matrices, including polyphenols, alkaloids and flavonoids, essential oils, oleoresins and natural colours, and standardised actives for nutraceutical, pharmaceutical, food and cosmetic use. It is also used for residue and environmental extraction from solids and for R&D and pilot work where speed and low solvent use matter.

What capacity is available?

Mechotech configures capacity to the process requirement, from pilot and R&D units through to commercial-scale plants. Cell or vessel volume, heating duty, pressure rating, solvent-handling and recovery capacity and cycle time are all sized around the feedstock, chosen solvent, throughput and finished-product specification, with a pilot recommended to validate parameters before scale-up.

What material of construction and compliance does Mechotech use?

Product-contact components are built in SS 316L with SS 304 for structural and non-contact areas, finished to smooth, CIP-friendly, hygienic standards suited to solvent service. Systems follow GMP and cGMP hygienic design principles for pharmaceutical, nutraceutical and food-grade production, with appropriate safety interlocks for solvent handling and documentation to support qualification.

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

Yes. Mechotech designs, engineers and fabricates the complete pressurized liquid extraction system, including the extraction cells, heaters, high-pressure pumps, solvent-recovery circuit 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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Pressurized Liquid Extraction Plant