Recovery of aqueous glyoxylic acid solutions
AssigneeBASF SE
InventorsGerhard Wickenhaeuser, Bernd Heida, Fritz Graf, Leopold Hupfer
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Abstract
Aqueous glyoxylic acid solutions, essentially free of other acids, are recovered from aqueous solutions which still contain other acids, by a method in which the aqueous solution is mixed with an organic nitrogen compound at as high as 50.degree. C., the phases are separated, and the glyoxylic acid is extracted from the organic phase with water, at a higher temperature.
Claims9
A process for the recovery of an aqueous glyoxylic acid solution, essentially free of other acids, from an aqueous solution which contains other acids in addition to glyoxylic acid by treating the aqueous solution with a solution of organic nitrogen compound dissolved in a non-polar organic solvent, said organic nitrogen compound being selected from the group consisting of a straight-chain or branched tertiary amine having a molecular weight higher than 200 and a dialkylated acid amide, wherein the treatment is carried out by mixing the solutions at a temperature up to 50.degree. C., and the glyoxylic acid is extracted from the resulting organic phase with water, at a higher temperature.
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