Process for the manufacture of thioglycolic acid

Details Process for the manufacture of thioglycolic acid Process for the manufacture of thioglycolic acid

C - Chemistry, Metallurgy

07

C

C07C 323/52 (2006.01) C07C 319/02 (2006.01)

Patent

CA 2193055

A process is described for the manufacture of thioglycolic acid by the conversion of monochloroacetic acid with hydro- gen sulfide under pressure in the presence of tertiary amines in solution, whereby care is taken that the partial pressure of hydrogen sulfide over the reaction medium is at least 2 bar up to the end of the reaction, and the thiogly- colic acid formed as an ammonium salt is released by means of acid. The partial pressure of hydrogen sulfide can be maintained by linking the reaction chamber with a source of hydrogen sulfide under pressure during the conversion.

rocédé pour la fabrication de l'acide thioglycolique par conversion de l'acide monochloracétique avec du sulfure d'hydrogène sous pression en présence d'amines tertiaires en solution, où l'on s'assure que la pression partielle du sulfure d'hydrogène au-dessus du milieu de réaction est d'au moins 2 bars jusqu'à la fin de la réaction; l'acide thioglycolique produit sous forme de sel d'ammonium est libéré au moyen d'un acide. La pression partielle du sulfure d'hydrogène peut être maintenue en reliant l'enceinte réactionnelle à une source de sulfure d'hydrogène sous pression durant la conversion.

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