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The dual‐solvent extraction of wool grease with hexane and aqueous isopropanol
Author(s) -
Anderson C. A.,
Warner J. J.
Publication year - 1983
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02669972
Subject(s) - grease , wool , aqueous solution , solvent , chromatography , hexane , extraction (chemistry) , chemistry , fractionation , materials science , pulp and paper industry , organic chemistry , composite material , engineering
Hexane solutions of three wool greases of different purities—(a) B.P. grade, (b) a typical commercial grade, and (c) a very crude grease‐were extracted by countercurrent flow of aqueous isopropanol (60% v/v IPA) in a 12‐stage mixer‐settler pilot plant. Fractionation performance was in close agreement with that predicted by an ex‐traction model developed previously. Concentrations of detergent in the product greases were 0.00%, 0.00% and 0.43%, respectively. However, even with the crude grease the concentration of detergent oligomers with more than 7 ethoxylate units was zero; free acids content was slightly reduced; and the free cholesterol content was unaffected. The color of the wool grease was improved by solvent extraction, but the bleachability was only marginally improved. The complete removal of detergent oligomers indicates that the extrac‐tion technique will improve the water‐emulsifying capacity of cer‐tain wool greases and overcome the synergism responsible for hyp ersensitivity.