FIELD: chemistry.
SUBSTANCE: first, sulphate soap is combined with an alkaline washing solution, which has a lower concentration of lignates and inorganic solid substances than the sulphate soap. Resulting mixture includes washed tall oil soap, a concentrated salt solution, lignates and calcium carbonate. After that, washed tall oil soap is separated from the concentrated salt solution, lignates and calcium carbonates, preferably with an application of centrifugation, decantation, filtration, settling or combination of the said technologies. Acidification of washed tall oil soap forms a mixture of crude tall oil and spent acid. Crude tall oil is separated from spent acid. Spent acid is converted into alkali, and, at least, a part of it is returned for a application as alkaline washing solution.
EFFECT: invention makes it possible to manufacture crude tall oil, simultaneously preventing technological shortcomings, caused by the accumulation of calcium sulphate in acidification installations or after them.
18 cl, 13 dwg, 6 tbl, 4 ex
