METHOD FOR PRODUCING METHYLENE-DISULFONIC ACID COMPOUND

摘要

The purpose of the present invention is to efficiently produce a methylene-disulfonic acid compound by using a carboxylic acid chloride compound and by using an industrially advantageous method. Provided is a method for producing a methylene-disulfonic acid compound represented by formula (3) (in formula (3), R1 and R2 are the same as R1 and R2 in formula (1)) includes the following: (A) a step of reacting a carboxylic acid halide compound represented by formula (1): R1R2CHCOX (1) (in formula (1), R1 and R2 are each independently a hydrogen atom or a C1-C4 alkyl group in which a hydrogen atom may be substituted with a halogen atom, and X is a halogen atom) with chlorosulfonic acid; and (B) a step of mixing water with the reaction liquid obtained in step (A).