Clariant Produkte (deutschland) Gmbh

Clariant Produkte Gmbh

Norbert Kohl

Hans-Tobias Macholdt

Ruediger Baur

Eduard Michel

A dye base sulfate and method of making are described. The dye base sulphate of formula (I) is produced with a residual amine content of less than 2000 ppm, as determined by HPLC, by precipitation of the dye base, made by Friedel-Crafts alkylation, substitution and hydrolysis, as the dye base sulphate is a) taken up in water and subjected to a first steam distillation then filtered and optionally dried at 50 to 180&#xb0; C., b) the pressed cake is treated with water or the optionally dried dye base sulphate is moistened with water, c) subjected to a further steam distillation and filtration and d) dried at 50 to 180&#xb0; C. 

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Muenster, Germany

Norbert Kohl