the extractor and suspended in 500 ml of chloroform the suspension is stirred for 5 min and the solvent is evaporated to dryness at 35 u00b0 c the obtained powder is loaded again into the plant extractor and an extraction cycle is repeated under the same conditions for about 3 hours finally the mixture is removed from the extractor suspended in 500 ml of chloroform stirring for 10 min at room temperature and filtered with suction the resulting clear chloroform solution is evaporated to dryness under vacuum at 35 u00b0 c to obtain 24 g of a surfactant purified paste the separator is washed twice with 150 ml of chloroform the two washings are combined and evaporated under vacuum at 35 u00b0 c 5 2 g of impurities are obtained similar results can be obtained following the procedures described in example 1 without resuspending the material in chloroform half way through the cycle in this case the mixture from the extractor is mixed by hand and loaded again to repeat the extraction cycle under the same operative conditions following the same procedure as in examples 1 and 2 but carrying out the extraction cycle under a pressure of 250 bars 23 5 g of purified surfactant paste were obtained from 30 g of the starting ps crude paste separating 6 5 g of impurities 30 g of ps crude paste are dissolved in 400 ml of chloroform at room temperature with stirring when the dissolution is complete 60 g of celite 545 merck 2693 are added in a 2 1 w w ratio the solvent is evaporated to dryness under vacuum at 35 u00b0 c a powder is obtained which is placed into the plant extractor ______________________________________fluid carbon dioxidepressure 200 barsextractor temperature 40 u00b0 c.