(1) In the process of papermaking, pine wood is boiled with alkali under pressure, the fatty acids and rosin acids in pine wood are dissolved in alkali liquor in the form of sodium soap to obtain "black liquid soap", and treated with sulfuric acid to obtain crude Tol oil, which is prepared by distillation.It is mainly used to produce oil field chemicals and ore flotation agents.It is also used in the production of dimer and trimer fatty acids used in the paint industry.
(2) fatty acids obtained from Tall oil.The scum obtained from kraft pulp waste liquor of coniferous trees is the mixture of rosin acid, oleic acid and linoleic acid after acidification, which is called Tuol oil.The fatty acids of Tuol oil obtained by fractionation, which contain 6% ~ 8% rosin acid, are used as raw materials for soap making.After further fractionation, high quality Tall oil fatty acids containing less than 2% resinous acid can be obtained, which can be used to produce dimer fatty acids and other products
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