The existence of a concentrated alkali salt
(EO/Li = 6/1) may weaken the interactions between the plasticizer and the PVC polymeric matrix, which will also influence the mechanical properties remarkably.
On the other hand, it seems to be very attractive to separate the sterol fraction from the mixture of fatty acid alkali salts
, glycerol, excess of alkali, and solvent by using column chromatography separation with principles of solid phase extraction (SPE).
The salt of organic sulfonic acid comprises one or more selected from the group consisting of alkali salts
of alkyl sulfonic acid with alkyl group with 6-22 carbon atoms, alkali salts
of alkyl aryl sulfonic acid with alkyl group with 2-22 carbon atoms and alkali salts
of sulfo fatty acid ester with alkyl group with 2-22 carbon atoms.