METHOD FOR PRODUCING POLYMER SCALING INHIBITOR FOR WATER RECYCLING SYSTEMS Russian patent published in 2021 - IPC C09K15/04 C08F20/06 C08F22/02 C02F5/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a method for producing water solutions of low molecular weight copolymers of monoethylenically unsaturated carboxylic acids with 3-4 carbon atoms used as scaling inhibitors in water recycling systems and in heat power engineering. The method for producing a polymer scaling inhibitor consists in preliminarily preparing two reagent solutions. One of said solutions consists of acrylic, and/or methacrylic, and/or maleic, and/or fumaric acids, and/or allylsulphonic acid, and/or water-soluble salts thereof with a monomer concentration of 15 to 40% wt., an initiator in the amount of 0.001 to 1% wt., water the rest. The second solution consists of 0.001 to 0.4% wt. of a molecular weight regulator, the rest is water. The first and second reagent solutions are simultaneously dosed into a flow reactor at a temperature of 75 to 90°C using two pumps. A T-shaped mixer is used as a flow reactor. A fluorescent organic compound containing an allylic bond in an amount of 0.1 to 1% wt. is added therein to one of the solutions. The produced reaction mass is then passed through a coil with an inner diameter of 1 to 10 mm, and radical copolymerisation of the above reagents is executed at a temperature of 75 to 90°C. Inorganic peroxy compounds are used as an initiator, and sodium hypophosphite is used as a molecular weight regulator.

EFFECT: invention makes it possible to simplify the process of producing a polymer scaling inhibitor by producing water solutions of low molecular weight copolymers of monoethylenically unsaturated carboxylic acids with 3-4 carbon atoms in flow reactors with a possibility of producing efficient scaling inhibitors for use in water recycling systems and heat power engineering, while also making it possible to ensure express analysis and "real-time" monitoring of inhibitor concentration in water recycling systems without assaying.

4 cl