Bayer Aktiengesellschaft

Reinhard Kaiser

Guido Steffan

Horst Behre

Joachim Probst

Gunter Kolb

Rolf Putter

Axel Vogel

Franz Alfes

Franz Weider

Diez Heine

Jurgen Zander

Hans-Joachim Becker

Otto Barth

Jurgen Dammann

A process has been provided for the preparation of nitro-T-acid by nitration of naphthalene-1,3,6-trisulphonic acid from a nitration mixture which has reacted to the extent of at least 80% which naphthalene-1,3,6-trisulphonic acid or a mixture containing the latter. Nitro-T-acid (and T-acid) is an intermediate for the preparation of H-acid which, in turn, is an intermediate for the preparation of dyestuffs.

Process for the preparation of nitro-T-acid

A process for preparing 1,2,4-triazole which comprises contacting hydrazine with formamide in the molar ratio of 1:2.0-2.7 at a temperature from 100.degree. to 250.degree. C. in the presence of ammonia.

Process for the preparation of 1,2,4-triazole

A chlorinated colorless polyolefin, preferably a chlorinated colorless isotactic polypropylene, soluble in carbon tetrachloride and having a chlorine content of from 60% to 70% by weight and an average degree of polymerization of from 2000 to 6000, produced by chlorinating polyolefins having a degree of polymerization of from 2000 to 20,000 in suspension or solution or in suspension and solution at 40 to 60.degree. C. in the presence of a halogen transfer agent, a chlorination catalyst and from 0.2 to 0.5% by weight, based on polyolefin, of at least one compound corresponding to the general Formula (I):

Chlorination of polyolefins in the presence of complex formers

A process has been invented for the preparation of aminonaphthalenesulphonic acids by the catalytic hydrogenation of salts of nitronaphthalenesulphonic acids with hydrogen in the presence of Raney nickel catalysts at elevated temperature and pressure, said catalysts comprising a combination of fresh Raney nickel catalyst and Raney nickel catalyst which has already been used in prior hydrogenation or hydrogenations.

Process for the preparation of aminonaphthalenesulphonic acids

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Cologne, Germany

Reinhard Kaiser