Patent · US Expired

Preparation of pure dimethyl carbonate

US4162200A · kind A · utility

11Cited by

3References

5Claims

0Family size

Assignee

BASF SE

Inventors

Walter Himmele · Monsheim, DE
Karl Fischer · Burns Lake, CA
Gerd Kaibel · Lampertheim, DE
Kurt Schneider · Farmington, US
Rudolf Irnich · Worms, DE

Key dates

Filing date	Jan 23, 1978
Grant date	Jul 24, 1979
Priority date	—
Expiry date	Jan 23, 1998

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C68/08
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.