Hydrochloric Acid → Dipotassium 4,4'-dinitrostilbene-2,2'-disulphonate

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1000 g of 4.5% strength by weight sodium hydroxide solution and 3 g of 4,4'-dinitrostilbene-2,2'-disulphonic acid are initially taken at 70° C. 124 g of 87.2% strength finely powdered 4,4'-dinitrodibenzyl-2,2'-disulphonic acid and 430 g of 6.19% strength by weight aqueous potassium hydroxide solution are added in small portions (approximately 20 portions) at 70° C. 50 l/hour of oxygen and 20 l/hour of air are passed into the reaction mixture for the whole duration of the experiment. After the mixture has been stirred for a further 2 hours at 70° C., a further 6 g of 100% strength by weight potassium hydroxide solution are added and the mixture is neutralized with 210 g of 30% strength by weight hydrochloric acid. 145 g of moist dipotassium 4,4'-dinitrostilbene-2,2'-disulphonate, corresponding to 124.7 g of dry material are isolated by filtration. The yield is found to be 97.2% of theory according to analysis by means of the HPLC method.

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