FIELD: chemistry.
SUBSTANCE: invention relates to production of 1,2-benzisothiazolin-3-one or its sodium salt. Method comprises steps (i) heating a mixture of sodium sulphide hydrate and N-methyl-2-pyrrolidone, (ii) distillation of water from mixture and, optionally, at least part of N-methyl-2-pyrrolidone, leaving sodium sulphide with depleted water content and, optionally, water and/or N-methyl-2-pyrrolidone, (iii) introduction of at least one benzamide, substituted in position 2, selected from a group, consisting of 2-chlorobenzamide, 2-fluorobenzamide, 2-nitrobenzamide, 2-cyanobenzamide and 2-C1-6 alkoxybenzamide with a branched or linear chain, in sodium sulphide with depleted water content to form a composition containing 2-mercaptobenzamide or its sodium salt, and (iv) of oxidative cyclisation of composition, containing 2-mercaptobenzamide or its sodium salt, by reaction with a reagent selected from a group consisting of aqueous hydrogen peroxide, MCPBA (meta-chloroperoxybenzoic acid), peracetic acid, perbenzoic acid and perphthalic acid.
EFFECT: production of 1,2-benzisothiazolin-3-one and its sodium salt with good output and purity.
3 cl, 8 ex
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