Patent · US Expired

Process for the purification of crude propene oxide

US7049450B2 · kind B2 · utility

14Cited by

2References

20Claims

0Family size

Assignees

Degussa AG · DE
UHDE GMBH · DE

Inventors

Willi Hofen · Rodenbach, DE
Thomas Haas · Munster, DE
Wolfgang Wöll · Maintal, DE
Georg Thiele · Hanau, DE

Key dates

Filing date	Nov 26, 2003
Grant date	May 23, 2006
Priority date	—
Expiry date	Apr 25, 2024

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D301/32
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for the purification of a crude propene oxide containing methanol and acetaldehyde by a continuously operated extractive distillation using an extraction solvent lowering the volatility of methanol and feeding a compound containing an unsubstituted NH2 group capable of reacting with acetaldehyde to a distillation column at a point above the feeding point of the crude propene oxide to give a purified propene oxide containing less than 100 ppm methanol and less than 100 ppm acetaldehyde. There is also disclosed a process for the catalytic epoxidation of propene that includes this purification stage.

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