The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 17, 2014
Filed:
Jan. 21, 2009
Applicants:
François Bleger, Geispolsheim Gare, FR;
Olivier Simon, Jaux, FR;
Alain Schouteeten, Ezanville, FR;
Inventors:
Assignee:
Clariant Specialty Fine Chemicals (France), Trosly Breuil, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 51/235 (2006.01); C07C 51/27 (2006.01);
U.S. Cl.
CPC ...
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 Ka/Q>10, where Ka is the total volumetric mass transfer coefficient and Q is the heat load liberated by the reaction per mole of glyoxal.