METHOD OF PURIFICATION THE WATER SOLUTIONS FROM LIGNOSULFONATES AND CHLORLIGNINS BY FORMATION OF THE COMPLEX WITH POLYETHYLENEPOLYAMINE Russian patent published in 2007 - IPC C02F1/58 C02F101/30 C02F103/28 

FIELD: environmental protection; pulp-and-paper; other industries; methods of purification the water solutions from lignosulfonates and chlorlignins.

SUBSTANCE: the invention is pertaining to purification of the waste waters from the industrial lignines, such as lignosulfonates, chlorlignins. The method may be used, for example, at purification of the bleaching filtrates formed in the pulp-and-paper production (PPP). For realization of the method the water solutions (the PPP waste waters)containing lignosulfonates and chlorlignins at their initial concentration in the solution - 0.5-10 g/l and рН of the solution - 2-5 are treated with polyetylenepolyamine at the mass ratio of polyetylenepolyamine : lignosulfonates, chlorlignins, equal to 0.1 - 1:1. The formed water insoluble complex after sedimentation is separated, for example, by filtration. The method ensures 80-96 % extraction of the lignosulfonates and chlorlignins.

EFFECT: the invention ensures 80-96 percent extraction of the lignosulfonates and chlorlignins.

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