Process for the production of sulfuric acid semi- ester...

Details Process for the production of sulfuric acid semi- ester... Process for the production of sulfuric acid semi- ester...

C - Chemistry, Metallurgy

09

B

260/153, 260/196

C09B 1/34 (2006.01) C09B 45/18 (2006.01) C09B 47/04 (2006.01) C09B 62/503 (2006.01)

Patent

CA 1084047

Abstract of the Disclosure: Improved process for the sulfatation of the hydroxy group of a .beta.-hydroxy-ethylsulfonyl group present in compounds select- ed from the dyestuff class which comprises carrying out the reaction in a machine operating with a kneading action and effect and with the use of only 1 to 5 times the equimolar amount of a concentrated sulfuric acid, of oleum or sulfur dioxide itself. The .beta.-sulfatoethylsulfonyl group containing dyestuffs, thus prepared have a high purity and are obtained in a high yield and esterification rate. Above all, the novel process is distinguished by a highly reduced salt and acid content of the waste water.

283916

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