Evaporation method solutions used to compensate for losses of chemicals in manufacturing processes pulp

摘要

PCT No. PCT/SE83/00280 Sec. 371 Date Mar. 8, 1984 Sec. 102(e) Date Mar. 8, 1984 PCT Filed Jul. 11, 1983 PCT Pub. No. WO84/00390 PCT Pub. Date Feb. 2, 1984.A method for keeping the heating surfaces in the final thickener (VI), which is divided into several sections (A,B,C), clean in evaporating waste liquors in pulping processes for recovering the cooking chemicals. Chemical solutions e.g. residual products from other processes as tall oil separation and chlorine dioxide production are added to cover the chemical losses. According to the invention the chemical solutions are supplied to those sections of the final thickener which are at the time not being washed with thick waste liquor from the preceding evaporator (II).