Bechamp reduction of dns to das using h2so4 and trace of hoac

Details Bechamp reduction of dns to das using h2so4 and trace of hoac Bechamp reduction of dns to das using h2so4 and trace of hoac

C - Chemistry, Metallurgy

07

C

260/503

C07C 309/46 (2006.01)

Patent

CA 1277678

BECHAMP REDUCTION OF DNS TO DAS USING H2SO4 AND TRACE OF HOAc ABSTRACT OF DISCLOSURE A process for preparing bis-diaminostilbene disulfonic 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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