Process for the preparation of an aqueous 3-chloro-2-...

Details Process for the preparation of an aqueous 3-chloro-2-... Process for the preparation of an aqueous 3-chloro-2-...

C - Chemistry, Metallurgy

07

C

31/1, 260/503.7

C07C 143/10 (1980.01)

Patent

CA 1171429

ABSTRACT OF THE DISCLOSURE An improved and novel process for the preparation of an aqueous 3-chloro2-sulfopropionic acid reagent involves the formation of a re- action mixture by adding acrylic acid to chlorosulfonic acid maintained at about 45 to 130°C, maintaining the mixture at about 60-130°C for about 2-6 hours, and adding sufficient water to the resulting anhydrous reagent to decompose the unreacted chlorosulfonic acid and dilute the reagent may be vacuum stripped to remove residual hydrochloric acid. Crystalline 3-chloro-2sulfopropionic acid may be isolated from the aqueous reagent at a solids content above 80% and below 95%. preferably at 85% to 90%.

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