Supercritical Fluid Extraction

Salient Features

  • Pressures upto 700 bar for lab scale units & upto 450 bar for commercial plants
  • Semi or fully automated PLC based plants with CO recycling 2
  • PED, U stamp, CE, CSA, UL certification optional
  • Customizable designs as per client requirements

World-class technology for natural products

  • There is a tremendous demand for high purity & residual solvent free extracts of natural products. Also there is increasing requirement of eco-friendlymanufacturing processes for the extraction of natural products
  • Supercritical fluid extraction technology provides an economical solution toproviding a safe & eco-friendly way for extraction of natural products. Itssuperiority over the conventional technologies of extraction, especially fornatural products in the food and pharmaceutical industry is well recognized
  • Supercritical CO2 textile dyeing is an emerging innovative waterless technology for dyeing of textile fabrics that will revive the textile industries

Commercial Applications

  • Extraction of natural products such as spice oil & oleoresins, flavors, fragrances, colors
  • Decaffeination of tea & coffee
  • Production of uniform &ultra fine particles
  • Supercritical CO2 (SCO2) textile dyeing of fabrics
  • Supercritical CO2 (SCO2) cleaning of high precision metal components
  • Drying of aerogels

Advantages of SCFE

  • Extract with delicacy & freshness close to natural
  • High potency of active components
  • Longer shelf life extracts
  • Eco-friendly & green technology with no residual solvent & effluents
  • High flexibility of process conditions
  • Simultaneous fractionation of extracts
  • High yields compared to solvent extracted products
  • Low batch times for extraction
  • Recycling of CO2
  • Low operating cost

Advantage of CO2 as a solvent

  • Carbon dioxide is generally regarded as safe (GRAS) for food products
  • Inexpensive & easily available
  • Non-toxic, non-flammable and inert to most materials

Process description for lab-scale plants

The Carbon dioxide gas from the cylinder is first liquefied & then pressurizedabove the critical pressure of CO2 (73.8 bar) to the required pressurenecessary for extraction. This high pressure liquid CO2 is then heated abovethe critical temperature of CO2 (31 °C) to the required temperature. CO2which is now in supercritical phase (SCCO2) enters the extractor where theraw material is fed in powder form & the extraction is achieved on the basisof solubility. The compounds dissolved in SCCO2 finally come to theseparator at atmospheric pressure & get precipitated. CO2 leaving theseparator is then measured by passing it through a CO gas flow meter.

Process description for commercial scale plant

The raw material in powder form is fed to the extractor. The liquid carbondioxide from the CO2 tank is precooled by passing it through the precooler.This precooled liquid carbon dioxide is then pressurized by means of apositive displacement plunger pump to a pressure above the criticalpressure of CO2 (i.e. 73.8 bar). High pressure liquid CO2 is then heated abovethe critical temperature of CO2 (i.e 31 °C) by passing it through preheater. CO2which is now in the supercritical state enters the extractor in which the rawmaterial is loaded. The SCCO2 dissolves substances on the basis of solubility,depending on operating conditions. The SCCO2 with soluble extracts enters the separators where the pressure & temperature are reduced sequentiallyso that solubility decreases & extract precipitates in the separators. Finallythe clean CO2 without any traces is recycled back to the CO2 tank viacondenser.

MOC SS316

Volume (ltr) Design Pressure (bar) Design Temperature (°C)
Standard Optional Standard Optional
0.1 to 2350500, 700100200
5 to 25500
50 to 100NA150
200 to 1000

SCFE standard models

Model No. Working Volume (ltr) Feed Capacity* (kg/day)
E13310.10.24
E1431/td> 0.250.6
E21310.51.2
E233112.4
E243124.8
E2531512
E31311024
E33312560
E343150120
E3531100240
E3631200480
E37315001200
E383110002400
Notes:
  1. *The feed capacity is assuming bulk density of 0.4 kg/ltr of feed,6 batches / day & one extractor. 5 ltr & above can be offered with 2extractors & the feed capacity shall double the above given capacity.
  2. 5 ltr & above systems are offered with CO recycling & PLC controls.

Optional Accessories

Video

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