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
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
ORGANIC CHEMISTRY
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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