The separation of solid fatty acids from liquid fatty acids by the formation of acid soaps. I. Tallow soaps |
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Authors: | W O Munns S Kairys Dilys A Manion E M Meade |
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Affiliation: | (1) Canada Packers Limited, Toronto, Canada;(2) University of Toronto, Canada |
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Abstract: | The formation of acid soaps has been used successfully for the separation of a mixture of fatty acids into high and low iodine
value fractions. The acid soaps of saturated acid can be made to crystallize from water leaving their unsaturated counter
parts in solution. Acid soaps of saturated fatty acids are well characterized compounds with the formula R-COOM.R-COOH, where
R is a straight alkyl chain, and M is sodium, potassium or ammonium.
Optimum crystallization conditions involve a soap concentration of 2–5%, pH adjustment to between 7.0 and 8.0, an initial
crystallization temperature not below 25C, and a crystallization period of at least 4 hr during which time cooling to a final
temperature of 5–10C must be gradual, and agitation gentle. |
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