POLYACRYLAMIDE-BASED FLOCCULANT FOR PURIFYING NATURAL WATER AND WASTE WATER FROM OIL REFINERIES Russian patent published in 2015 - IPC C02F1/56 B01D21/01 C08L33/26 C08K5/53 

FIELD: chemistry.

SUBSTANCE: invention can be used to purify natural water and waste water from oil refineries. The polyacrylamide-based flocculant includes polyacrylamide used in the form of an aqueous solution with molecular weight of 30 million, with hydrolysis degree of 70% and operating pH 5-11, wherein the polymer has swollen in water at room temperature for 1 day, a modifying agent - propylene glycol and water, with the following ratio of components, wt %: polyacrylamide 0.5-0.7; propylene glycol 0.15-0.3; water - the balance. To prepare the flocculant, propylene glycol is added to an aqueous polyacrylamide solution with said characteristics at room temperature while stirring in the disclosed ratio of components and then used to flocculate contaminated water.

EFFECT: flocculant provides faster and improved clarification of waste water owing to improved flocculating power of the composition of the reagent.

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