Solvent extraction

Details Solvent extraction Solvent extraction

1994-02-02

1995-01-03

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210639, 210651, 210653, B01D 6116

Patent

active

053783697

ABSTRACT:
The invention provides a method for the solvent-extraction of .beta.-carotene from an aqueous algal biomass suspension, whereby a vegetable oil which is immiscible with water is mixed with an aqueous biomass suspension, the biomass containing the .beta.-carotene, to form a mixture of the organic phase and the aqueous suspension, whereby the .beta.-carotene is caused to dissolve in the organic phase. This is followed by separation of the organic phase from the aqueous phase by passing the organic phase containing the dissolved .beta.-carotene through a semi-permeable membrane to effect microfiltration or ultrafiltration of the organic phase. The membrane is of a material which is hydrophobic and the organic phase is passed through the membrane with a pressure drop across the membrane which is lower than that which causes the aqueous phase to pass through the membrane.

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