Process for the preparation of 4,4'-diaminostilbene-2,2'-disulfo

Details Process for the preparation of 4,4'-diaminostilbene-2,2'-disulfo Process for the preparation of 4,4'-diaminostilbene-2,2'-disulfo

1976-08-24

1978-01-24

Chan, Nicky

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C14362

Patent

active

040703959

ABSTRACT:
4,4'-DIAMINOSTILBENE-2,2'-DISULFONIC ACID (HEREINAFTER ABBREVIATED AS DAS) or its alkali salt (abbreviated as DAS-salt) are prepared by catalytic hydrogenation of 4,4'-dinitrostilbene-2,2'-disulfonic acid (hereinafter abbreviated as DNS) or its alkali salt (abbreviated as DNS-salt). The catalytic hydrogenation is carried out using Raney nickel catalyst in the presence of dicyandiamide in water at a temperature in the range of 50.degree.-120.degree. C under an elevated hydrogen pressure. In both DNS-salt and DAS-salt alkali means sodium or potassium.

REFERENCES:
patent: 2455807 (1948-12-01), Redmon et al.
patent: 3936497 (1976-02-01), Hirata et al.
patent: 3989743 (1976-11-01), Braden et al.

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