Process for purifying glyoxal

Details Process for purifying glyoxal Process for purifying glyoxal

1974-06-11

1977-02-01

Daus, Donald G.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 4702

Patent

active

040061892

ABSTRACT:
Crude glyoxal solutions obtained for example by the oxidation of acetaldehyde with nitric acid are purified by removing volatile acids followed by neutralization. Thereafter, the glyoxal is converted into a glyoxal glyoxal-di-(alkylhemiacetal) with an alcohol containing 1 to 3 carbon atoms with water removal during the conversion. After separating salts and other impurities, the glyoxal-di-(alkylhemiacetal) is hydrolyzed with water at elevated temperatures to yield pure glyoxal hydrate.

REFERENCES:
patent: 2246049 (1941-06-01), Lange
patent: 3367973 (1968-02-01), Schramm et al.

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