Patent · US Expired

Separation of m- and p-dichlorobenzene

US5152875A · kind A · utility

3Cited by

6References

13Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Siegbert Rittner · Mörfelden, DE
Adolf Schmidt · Adelsheim, DE
Rudolf Steiner · Bassersdorf, CH
Leonhard Unverdorben · Uttenreuth, DE

Key dates

Filing date	Apr 8, 1991
Grant date	Oct 6, 1992
Priority date	—
Expiry date	Apr 8, 2011

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C17/386
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for separating m- and p-dichlorobenzene by extractive rectification with an extractant and removal of this extractant. Using as extractant an alkylene carbonate of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are identical to or different from one another and each is hydrogen, methyl or ethyl, with the proviso that together the radicals R.sup.1 to R.sup.4 do not contain more than 6 carbon atoms. The process of the invention makes it possible to separate off the m-isomer in high purity.

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