Continuous process for refining glyoxal

Details Continuous process for refining glyoxal Continuous process for refining glyoxal

1975-04-30

1977-12-27

Thomas, Jr., James O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 4702

Patent

active

040655067

ABSTRACT:
An improvement in a process for refining crude glyoxal solutions, especially those obtained by the oxidation of acid aldehyde with nitric acid, wherein the crude glyoxal solution, free of volatile acids, is neutralized, the glyoxal is transformed to the glyoxal semiacetal with an alcohol having 1 to 3 carbon atoms and, after separation of the salts and other impurities, is again hydrolized with water at elevated temperatures. The improvement described involves continuously extracting the glyoxal semiacetal formed with an organic solvent which is immiscible with water, hydrolyzing the extracted glyoxal semiacetal and refining the aqueous glyoxal solution obtained with active charcoal.

REFERENCES:
patent: 2339346 (1944-01-01), McNamee et al.
patent: 3367973 (1968-02-01), Schramm et al.
patent: 3542879 (1970-12-01), Dinwoodie et a.
patent: 3574765 (1971-04-01), Kuryla et al.

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