Clariant (france)

Clariant Specialty Fine Chemicals (france)

François Bleger

Alain Schouteeten

Olivier Simon

Jérôme Piron

Françoise Mordacq

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&#x3e;10, where Ka is the total volumetric mass transfer coefficient and Q is the heat load liberated by the reaction per mole of glyoxal.

Process of preparation of glyoxylic acid aqueous solution

Process for the preparation of a 2-(n-alkyl)-3-(4-hydroxybenzoyl)benzofuran of formula (I) in which R represents a linear or branched alkyl radical including from 1 to 5 carbon atoms and R1 represents a linear or branched alkyl radical including from 1 to 3 carbon atoms, a linear or branched alkoxy radical including from 1 to 3 carbon atoms, a halogen atom or a nitro radical, and intermediates.

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Geispolsheim-Gare, France

François Bleger