Basf Aktiengesellschaft

Armin Haag

Rudolf Bermes

Hellmut Kast

Peter Krotzsch

Fritz E Kempter

Erich Gulbins

Ruprecht Kroker

Wolfgang Kochanek

Wolfgag Habermann

A process for preparing amine salts of 4-nitrotoluene-2-sulfonic acid by sulfonation of nitrotoluene with oleum, subsequent dilution of the reaction mixture with water and extraction with lipophilic amines, wherein the acidic aqueous solution of the sulfonation product is partially neutralized with mineral bases. The compounds prepared according to the invention are particularly suitable for preparing dyes.

Preparation of amine salts of 4-nitrotoluene-2-sulfonic acid

The application relates to a process for removing nobler metal ions than iron, especially copper ions, from acidic process and waste waters by reduction under an inert gas atmosphere with carbonyl iron powders which have previously been subjected to a thermal treatment with hydrogen to remove nitrides and carbides. This process results in residual metal ion content &lt;0.5 ppm and thus complete removal of the metal ions to be reduced.

Removal of nobler metal ions than iron from process and waste waters

Pigment formulations and their use. The formulations contain pigments, organic solvents and from 10 to 80% by weight of a wetting agent consisting of a non-ionic organic compound which has a viscosity of from 500 to 10,000 mPa.s and has been produced by reacting an alkylated amide/formaldehyde reaction product and an epoxy resin, which may or may not be modified, in a weight ratio of from 9:1 to 1:9. They are used as additives in surface-coating binders, especially in cationic electrocoating finishes.

Pigment formulations for use in surface-coating binders

Growing community of inventors

Hirschberg, Germany

Armin Haag