METHOD OF PRODUCING SODIUM ALLYL SULPHONATE FOR SYNTHESIS OF SULPHO-CONTAINING CARBOXYLATE SUPER-PLASTICISERS FOR CEMENT MIXTURES Russian patent published in 2014 - IPC C07C303/32 C07C309/20 

FIELD: chemistry.

SUBSTANCE: method of producing sodium allyl suphonate involves reacting sodium sulphite and allyl chloride in a heterogeneous aqueous-organic medium in the presence of methoxy polyethylene glycol methacrylates (with 23-45 ethoxyl links) as phase-transfer catalysts. Synthesis is carried out at temperature of 30-40°C, synthesis time of 2-4 hours and molar ratio of sodium sulphite to allyl chloride of (1.0-1.1):1.0, concentration of methoxy polyethylene glycol methacrylate of 0.05-0.1% with respect to the mass of the aqueous phase. The obtained homogeneous aqueous sodium allyl sulphonate solution can be used without further purification for synthesis of super-plasticisers by radical terpolymerisation with methoxy polyethylene glycol methacrylates and (meth)acrylic acid.

EFFECT: simple technology of producing sodium allyl sulphonate when producing super-plasticisers for cement mixtures, low power consumption, preventing formation of waste water and high output of the end product.

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