FIELD: pharmaceuticals.
SUBSTANCE: invention relates to a method of the purification of acrylamido-2-methyl-2-propanesulfonic acid (ATBS), used as a monomer for the synthesis of polymers used as dispersants, thickeners, flocculants or superabsorbents. The method of purifying acrylamido-2-methyl-2-propanesulfonic acid includes two successive stages: obtaining a suspension of ATBS crystals by distilling an aqueous solution of ATBS, and isolating crystals of acrylamido-2-methyl-2-propanesulfonic acid by separating the solid and liquid phases of the said suspension, wherein at the first stage, distillation is performed continuously and at subatmospheric pressure.
EFFECT: provision of a method that meets the requirements for reducing the content of impurities in the product being purified, reducing the environmental impact of toxic solvents and reducing risks for employees and facilities.
15 cl, 1 dwg, 3 tbl, 3 ex
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