Basf Se Corporation

Basf Aktiengesellschaft

Recticel N.v.

Laszlo Somogyi

Karl Siemensmeyer

Marcus Guzmann

Stefan Stein

Harald Kiesow

Rolf Streicher

Heike Becker

Andrea Zamponi

Rainer Erhardt

Andreas Arlt

Michael Klemm

Reiner Erhard

The present invention relates to a process for dyeing leather with at least one dye F which has at least one alkaline-activable group of the formula A; where

Method for the reactive coloration of leather

Method for the reactive coloring of leather

A process for working up &#x3b2;-sulfatoethylsulfonylaniline-2-sulfonic acid from a solution in aqueous sulfuric acid, comprises a first step of the &#x3b2;-sulfatoethylsulfonylaniline-2-sulfonic acid being precipitated by addition of alkali or alkaline earth metal and/or ammonium salts, separated off and dissolved or the sulfuric acid being precipitated by addition of calcium salts and the resulting calcium sulfate being separated off if appropriate, and a second step of the resultant solution being adjusted to a pH between 1 and 5 by addition of alkali or alkaline earth metal or ammonium hydroxide, carbonate, bicarbonate and/or acetate, any calcium sulfate still present being separated off and the &#x3b2;-sulfatoethylsulfonylaniline-2-sulfonic acid being isolated from the solution.

Method for processing &#x3b2;-sulphatoethylsulphonylaniline-2-sulphonic acid

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Limburgerhof, Germany

Laszlo Somogyi