Exchange reactions control for selective separation of glyoxylic acid in technological mixtures of glyoxal oxidation /M. A. Pozdniakov, K. V. Rubtsov, V. V. Botvin [et.al.]

Электронный ресурс
Другой Автор
Pozdniakov, Maxim A.
Botvin, Vladimir V.
Sorvanov, Alexander A.
Knyazev, Alexey S.
Filimoshkin, Anatoliy G.
Rubtsov, Konstantin V.
Источник
Separation science and technology 2017 Vol. 52, № 5. P. 876-882
Аннотация
Separation of glyoxylic acid from unpurified multicomponent technological mixtures, resulting in the process of direct oxidation of glyoxal, and preparation of sodium glyoxylate are developed. The mixtures are treated with an optimal amount of CaCO3, which has to be prespecified by acidic–basic titration of the technological mixtures. Both separation of glyoxylic acid and preparation of sodium glyoxylate take place owing to ionic exchange reactions: calcium glyoxylate is easily converted into glyoxylic acid by action of oxalic acid. Reaction with Na2CO3 leads to the formation of sodium glyoxylate.
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Резюме
Separation of glyoxylic acid from unpurified multicomponent technological mixtures, resulting in the process of direct oxidation of glyoxal, and preparation of sodium glyoxylate are developed. The mixtures are treated with an optimal amount of CaCO3, which has to be prespecified by acidic–basic titration of the technological mixtures. Both separation of glyoxylic acid and preparation of sodium glyoxylate take place owing to ionic exchange reactions: calcium glyoxylate is easily converted into glyoxylic acid by action of oxalic acid. Reaction with Na2CO3 leads to the formation of sodium glyoxylate.