Purification of alkyl glyoxylate

Details Purification of alkyl glyoxylate Purification of alkyl glyoxylate

1988-07-25

1989-09-19

Bascomb, Wilbur

Distillation: processes, separatory

With chemical reaction

203 14, 203 67, 203 69, 203 72, 203 73, 203 80, 203DIG19, 203DIG25, 560177, 560186, 562577, B01D 122, B01D 336, C07C 6966

Patent

active

048678490

ABSTRACT:
There is disclosed an improved process for the manufacture of glyoxylic acid obtained by oxidation of glycolic acid. For processing purposes alkyl esters of these acids are employed. Increased efficiency is obtained by recovering glycolate rich streams from one or more distillation operations and after treatment to remove acetic acid by-product the streams are recycled to the oxidation reaction.

REFERENCES:
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patent: 4156093 (1979-05-01), Christidis
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patent: 4502923 (1985-03-01), Dyroff et al.
patent: 4692547 (1987-09-01), Driscoll et al.
"A Simple and Efficient Synthesis of Ethyl and Methyl Glyoxyate", James M. Hook, Synthetic Communications, 14(1), 83-87 (1984).
"A Convenient Preparation of Methyl and ethyl Glyoxylate", T. Kelly, T. Schmidt, J. Haggerty, Synthesis, Oct. 1972, pp. 544-545.

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