| http://www.w3.org/ns/prov#value | - east about 40% by weight and at most about 60% by weight, preferably about 50% by weight or more, and the boiling point of the basic organic nitrogen compound(s) used is equal to or above the boiling point of water and below the boiling point of the fatty acids to be extracted and adding from 1 to 4 parts, preferably from 2 to 4 parts, of alkane and/or of an ester, in particular an acetate, to 1 p
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