METHOD OF PREPARING PULP WATER FROM CARTON-PAPER MANUFACTURING FOR ITS REPEATED USE Russian patent published in 2009 - IPC D21F1/66 C02F1/52 C02F1/56 D21F1/70 

FIELD: chemistry; textiles; paper.

SUBSTANCE: pulp water is sequentially processed with a coagulant - N,N - poly-dimethyl - N¹,N¹ - di-allyl-ammonium chloride and flocculant - anionic polyacrylamide with the subsequent separation of the solid phase from the pulp water by floatation. Processing of pulp water is carried out with the relation of the coagulant to the flocculant from 1.3:1 to 6.7:1, predominantly from 2.6: to 4.0:1. Separation the solid phase from pulp water is carried out with the concentration of suspended materials 1000-2000 mg/dm³.

EFFECT: increase in the degree of purity of pulp water, prepared for its repeated use, decrease in the dry solid content of the cleaned water, removing the need of constantly regulating the pH of the cleaned water.

4 cl, 3 tbl, 3 ex