SFE-CO2 Technology

   
       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 a positive displacement plunger pump to a pressure above the critical pressure of CO2 (i.e. 73.8 bar). High pressure liquid CO2 is then heated above the critical temperature of CO2 (i.e 31 °C) by passing it through preheater. CO2 which is now in the supercritical state enters the extractor in which the raw material 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 sequentially so that solubility decreases & extract precipitates in the separators. Finally the clean CO2 without any traces is recycled back to the CO2 tank via condenser.

Advantages of SCFE
    1.Extract with delicacy & freshness close to natural
    2.High potency of active components
    3.Longer shelf life extracts
    4.Eco-friendly & green technology with no residual solvent & effluents
    5.High flexibility of process conditions
    6.Simultaneous fractionation of extracts
    7.High yields compared to solvent extracted products
    8.Low batch times for extraction
    9.Recycling of CO2
    10.Low operating cost


Advantage of CO2 as a solvent
    1.Carbon dioxide is generally regarded as safe (GRAS) for food products
    2.Inexpensive & easily available
    3.Non-toxic, non-flammable and inert to most materials


Commercial Applications
    1.Extraction of natural products such as spice oil & oleoresins, flavors, fragrances, colors
    2.Decaffeination of tea & coffee
    3.Production of uniform &ultra fine particles
    4.Supercritical CO2 (SCO2) textile dyeing of fabrics
    5.Supercritical CO2 (SCO2) cleaning of high precision metal components
    6.Drying of aerogels


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