Process for the production of pure 3,3',4,4'-tetraaminobiphenyl

Details Process for the production of pure 3,3',4,4'-tetraaminobiphenyl Process for the production of pure 3,3',4,4'-tetraaminobiphenyl

C - Chemistry, Metallurgy

07

C

C07C 211/54 (2006.01) C07C 209/68 (2006.01) C07C 209/84 (2006.01)

Patent

CA 2073628

HOE 91/F 225 Abstract of the Disclosure Process for the production of pure 3,3',4,4'-tetraamino- biphenyl The present invention relates to a process for the preparation of pure 3,3',4,4'-tetraaminobiphenyl in high yield by ammonolysis of 3,3'-dichlorobenzidine in the presence of copper powder and CuCl. After the crude product has been washed with ammonia water and water, the 3,3',4,4'-tetraaminobiphenyl, thus pretreated, is crystallized in water in the presence of 0 to 5 % by weight of activated carbon and of about 1 to 2 % by weight of a water-soluble reducing agent at temperatures of about 100 to about 140°C, under a protective gas atmosphere (redissolution). The water-soluble reducing agent is an alkali metal dithionite or alkali metal sulfite. The protective gas used can be nitrogen. The water used in the recrystallization (redissolution water) can be reused in whole or in part in the recrystallization.

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