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(1) In the process of paper making, the pine is boiled with alkali under pressure, the fatty acids and rosin acids in the

pine are dissolved in the form of sodium soap in the lye to obtain "black liquor soap", and the crude tol oil is obtained by distillation after being treated with sulfuric acid. It is mainly used to produce oilfield chemicals and ore flotation agents.

It is also used in the production of dimer and trimer fatty acids used in the coating industry.

(ii) Fatty acids obtained from Tol oil. The scum of coniferous trees obtained from the waste liquor of pulping by sulfate process, after acidification, the oily substance obtained is a mixture of rosin acid, oleic acid and linoleic acid, which is called tol oil. The fatty acid of Tual oil obtained by fractionating Tual oil contains 6%~8% rosin acid, which is the raw material of soap making. Further fractionation results in high quality Tol fatty acids containing less than 2% resinous acids, which can be used to manufacture dimer fatty acids and other products