Preparation of pure dimethyl carbonate

Details Preparation of pure dimethyl carbonate Preparation of pure dimethyl carbonate

1978-01-23

1979-07-24

Bascomb, Jr., Wilbur L.

Distillation: processes, separatory

Adding material to distilland except water or steam per se

Organic compound

203 60, 203 62, 203 67, 203 69, 260463, B01D 340, C07C 6900

Patent

active

041622006

ABSTRACT:
Dimethyl carbonate is obtained pure, from its solutions in methanol, by extractive distillation carried out with a temperature of from 60.degree. C. at the top to 250.degree. C. at the bottom of the column and employing, as the extractant, an aprotic organic liquid which is substantially inert toward dimethyl carbonate, boils at above 100.degree. C. at standard pressure, is miscible with dimethyl carbonate in all proportions and has a dielectric constant .epsilon. of from 4 to 90 and a dipole moment .mu. of from 1.5 to 5 Debye.

REFERENCES:
patent: 3803201 (1974-04-01), Gilpin et al.
patent: 3847755 (1974-11-01), Chanel et al.
patent: 3963586 (1976-06-01), Ginnasi et al.

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