FIELD: sewage treatment. SUBSTANCE: coagulating agent is prepared by hydrolysis of catalytic complex from alkylbenzenes production with basic aluminium chloride followed by separation of layers and lower layer removing that contains coagulating agent. The separated lower layer is treated with gaseous ammonia or amine, in part, monoethanolamide at amount 0.05-0.5 wt.-% and used as an effective coagulating agent. EFFECT: improved method of preparing. 2 cl, 1 tbl
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