Patent ID: 8772537

Claim:
A process for producing S-(3-aminopropyl)thiosulfuric acid, the process comprising the following steps (A1), (B1) and (C1): (A1) a step of reacting a hydrochloride of 3-chloropropylamine with an alkali metal salt of thiosulfuric acid in the presence of from 2.72 parts by weight to 6 parts by weight of water with respect to 1 part by weight of the hydrochloride of 3-chloropropylamine at between 50° C. and 100° C., (B1) a step of obtaining a mixture of a solid containing S-(3-aminopropyl)thiosulfuric acid and a liquid containing an alkali metal chloride by adjusting the temperature of the reaction mixture obtained in step (A1) to not lower than −15° C. and lower than 50° C., and (C1) a step of obtaining S-(3-aminopropyl)thiosulfuric acid as a solid by separating the solid containing S-(3-aminopropyl)thiosulfuric acid and the liquid containing the alkali metal chloride from the mixture obtained in step (B1).