Process for preparation of 4,4'-diaminostilbene-2,2'-disulfonic

Details Process for preparation of 4,4'-diaminostilbene-2,2'-disulfonic Process for preparation of 4,4'-diaminostilbene-2,2'-disulfonic

1974-12-02

1976-02-03

Thomas, Jr., James O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C14356

Patent

active

039364976

ABSTRACT:
Disodium 4,4'-diaminostilbene-2,2'-disulfonate is prepared by catalytically reducing disodium 4,4'-dinitrostilbene-2,2'-disulfonate with hydrogen in the presence of a nickel catalyst, either (1) in an alcohol medium in which a water content of the reaction system is 3 % by weight or below based on the system before the beginning of the reaction, or (2) in an aqueous medium in which pH of the system is adjusted to a range from 5 to 10 using a buffer.

REFERENCES:
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patent: 2933503 (1960-04-01), Clark et al.
patent: 3067253 (1962-12-01), Dietzier et al.
patent: 3148217 (1964-09-01), Freyermuth et al.
patent: 3350452 (1967-10-01), Rylander et al.
patent: 3555071 (1971-01-01), Rao et al.
patent: 3862245 (1975-01-01), Greco

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