Document Type and Number:
Japanese Patent JPS6115102
Kind Code:
B2
Abstract:
Improved process for the sulfatation of the hydroxy group of a beta -hydroxy-ethylsulfonyl group present in compounds selected 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.
Inventors:
ERUNSUTO HOIERU
HANSU HERUMUUTO SHUTOIERUNAAGERU
DEIITERU UAAGUNERU
HANSU HERUMUUTO SHUTOIERUNAAGERU
DEIITERU UAAGUNERU
Application Number:
JP9229177A
Publication Date:
April 22, 1986
Filing Date:
August 02, 1977
Export Citation:
Assignee:
HOECHST AG
International Classes:
C09B43/24; C09B62/503