Process for the preparation of 4,4'-dinitrostilbene-2,...

Details Process for the preparation of 4,4'-dinitrostilbene-2,... Process for the preparation of 4,4'-dinitrostilbene-2,...

C - Chemistry, Metallurgy

07

C

260/503

C07C 309/42 (2006.01)

Patent

CA 1262554

ABSTRACT OF THE DISCLOSURE 4,4'-Dinitrostilbene-2,2'-disulphonic acid salts are prepared by the oxidation of 4-nitrotoluene-2-sul- phonic acid or salts thereof in an aqueous alkaline medium, by adding potassium, calcium and/or magnesium ions during the reaction at the rate at which 4,4'-dinitrostilbene- 2,2'-disulphonic acid is formed, the amount of added potas- sium, calcium and/or magnesium ions at any point during the reaction being 10 to 150 mol %, relative to the amount of 4,4'-dinitrostilbene-2,2'-disulphonic acid present in the reaction mixture at that particular time, and by re- moving the precipitated salt of 4,4'-dinitrostilbene-2,2'- disulphonic acid. Le A 23 691

510328

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