Patent · US Expired

Process for the removal of dimethyl ether in methyl chloride

US4794204A · kind A · utility

3Cited by

5References

2Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Hendrik W. Post · Hofheim, DE
Helmold von Plessen · Kelkheim, DE
Wilhelm Lendle · Bad Soden am Taunus, DE

Key dates

Filing date	Jun 11, 1987
Grant date	Dec 27, 1988
Priority date	—
Expiry date	Jun 11, 2007

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C17/38
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process is described for the removal of dimethyl ether in methyl chloride by catalytic cleavage by means of hydrogen chloride. Dimethyl ether is present as an impurity in crude methyl chloride produced by the catalytic esterification of methanol. The crude methyl chloride is cooled so that water and hydrogen chloride separate out. Gaseous hydrogen chloride is then added to the methyl chloride in an amount corresponding to at least twice the molar amount of dimethyl ether, and the gaseous mixture is passed over a methanol esterification contact catalyst at an elevated temperature.

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