Verfahren zur Fraktionierung bzw. Raffination von lipiden Naturstoffen

摘要

A method for the fractionation and/or refinement of natural substances contg. lipids comprises extraction of the liq. substance with a compressed gas in the form of a liq. mixt. of 50-90 wt.% propane and 10-50 wt.% carbon dioxide, the mixt. being in a non-critical state . Pref. the extn. is carried out at 10-80(30-65) degrees C and 20-65 (30-55) bar using 1-25g of a mixt. comprising 60-80 wt.% propane and 20-40 wt.% CO2 per g of starting material. A high pressure extraction column is used with a counter-flow and a temp. gradient up to 20 degrees C has been set up. The extracted lipid components are sepd. from the extraction gases by increasing the temp. and/or reducing the pressure, pref. at less than 60 degrees C and 8-30 bar. The liq./liq. extraction step is a continuous one.