Process for the production of pure diglycolic acid by oxidation

Details Process for the production of pure diglycolic acid by oxidation Process for the production of pure diglycolic acid by oxidation

1976-09-08

1978-01-03

Garner, Vivian

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 5126, C07C 5142

Patent

active

040666913

ABSTRACT:
A process for the production of pure diglycolic acid by oxidation of diethylene glycol with nitric acid, comprises the steps of:
A. cooling the reaction mixture formed during the oxidation to a temperature of -10.degree. to +25.degree. C. and separating a first quantity of thus-crystallized diglycolic acid;
B. concentrating the first mother liquor at 5 - 530 millibars to a concentration of 35-45% by weight of HNO.sub.3 and cooling to a temperature of -10.degree. to +25.degree. C.;
c. separating a further quantity of thus-crystallized diglycolic acid; and
D. recycling the remaining second mother liquor to the reactor for oxidizing diethylene glycol with nitric acid.

REFERENCES:
patent: 3476804 (1969-11-01), Bende et al.

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