Exchange reactions control for selective separation of glyoxylic acid in technological mixtures of glyoxal oxidation

ABSTRACT

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 CaCO_3, 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.

KEYWORDS:

• Exchange reactions
• glyoxal oxidation
• glyoxylic acid
• selective separation
• sodium glyoxylate

Acknowledgments

The authors acknowledge assistance of the Laboratory for Physico-Chemical Methods of Analysis. Also, thanks are due to Nataly Korotchenko and Dmitry Novikov for consultations (Tomsk State University).

Declaration of interest

The authors declare no competing financial interest.

Funding

This research is supported by the Tomsk State University Competitiveness Improvement Program and by the Foundation for Assistance to Small Innovative Enterprises (FACIE) (agreement № 5098GU1/2014).

Additional information

Funding

This research is supported by the Tomsk State University Competitiveness Improvement Program and by the Foundation for Assistance to Small Innovative Enterprises (FACIE) (agreement № 5098GU1/2014).