Process of preparation of glyoxylic acid aqueous solution
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United States of America Patent
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Jun 17, 2014
Grant Date -
Jan 20, 2011
app pub date -
Jan 21, 2009
filing date -
Jan 25, 2008
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Abstract
The invention relates to a method for preparing an aqueous solution of glyoxylic acid by oxidation of an aqueous solution of glyoxal with oxygen or a gas containing oxygen, in the presence of a catalytic quantity of nitric acid and/or at least one nitrogen oxide, a strong acid not oxidizing glyoxal, and by maintaining conditions satisfying the equation KLa/Q>10, where KLa is the total volumetric mass transfer coefficient and Q is the heat load liberated by the reaction per mole of glyoxal.
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