Recovering reacted prods. from sodium dithionate prepn. - by distn., acidification, heating pptn. filtering and crystallisation

Treating residual mother liquor from prepn. of Na dithionate by reacting SO2 with Na formate and a Na cpd. with a basic reaction in aq. alcoholic medium, comprises distn to separate the alcohol and the organic formate, then acidification to pH 3.0-4.5, heating the soln. to 75-110 degrees C sepg. the...

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Main Authors WUNSCH,GERD,.DR, KIENER,VOLKER,.DR, SARNECKI,WILHELM,.DR, SCHREINER,SIEGFRIED,.DR, HEINER,.REICH,HANS
Format Patent
LanguageEnglish
German
Published 24.05.1978
Edition2
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Summary:Treating residual mother liquor from prepn. of Na dithionate by reacting SO2 with Na formate and a Na cpd. with a basic reaction in aq. alcoholic medium, comprises distn to separate the alcohol and the organic formate, then acidification to pH 3.0-4.5, heating the soln. to 75-110 degrees C sepg. the S. pptd., and isolating the Na formate by evapn. and cooling. Alternatively, the soln. can be evapd. to dryness, then taken up at 50-100 degrees C in a soln. of Na formate satd. at 20-30 degrees C, filtering, cooling and sepn. of the crystallised formate. No polluting substance is released, while some of the initial reactants of the dithionate prepn. can be recycled.
Bibliography:Application Number: DE19762651418