Bechamp reduction of DNS to DAS using H.sub.2 SO.sub.4 and trace

Details Bechamp reduction of DNS to DAS using H.sub.2 SO.sub.4 and trace Bechamp reduction of DNS to DAS using H.sub.2 SO.sub.4 and trace

1986-09-17

1989-04-11

Chan, Nicky

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C14362

Patent

active

048204528

ABSTRACT:
A process for preparing bis-diaminostilbene dilsulfonic acid from bis-dinitrostilbene disulfonic acid by an improved Bechamp reduction process is disclosed. The process involves reduction with metallic iron in an acidic medium consisting of 0.033 to 0.27% of acetic acid and 0.38 to 0.76% of sulfuric acid in water at an oxidation-reduction potential (iron/thalamide electrode) in the range 140 to 270 millivolts.

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patent: 2762801 (1956-09-01), Hausermann
patent: 3472842 (1969-10-01), Hausermann et al.
patent: 3506657 (1970-04-01), Hausermann
patent: 4179476 (1979-12-01), Franz et al.
patent: 4217304 (1980-08-01), Albrecht et al.
Bechamp Reduction Process (Merck Index, 10th Ed. p. ONR-8) (1983).

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