Patent · US Expired

Method for the continuous purification by distillation of 1,2-propylene glycol that accumulates during the synthesis of propylene oxide without coupling products

US7332634B2 · kind B2 · utility

5Cited by

4References

17Claims

0Family size

Assignee

BASF SE

Inventors

Peter Bassler · Viernheim, DE
Hans-Georg Goebbel · Kallstadt, DE
Joaquim Henrique Teles · Waldsee, DE
Peter Rudolf · Ludwigshafen, DE

Key dates

Filing date	Jul 22, 2003
Grant date	Feb 19, 2008
Priority date	—
Expiry date	Apr 9, 2024

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01D3/143
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

The invention relates to a continuously operated process for the purification by distillation of the 1,2-propylene glycol formed as by-product in the synthesis of propylene oxide, wherein the mixture formed in the synthesis which contains the 1,2-propylene glycol is separated in a dividing wall column into low-, intermediate- and high-boiling fractions and the 1,2-propylene glycol is taken off as intermediate boiler at the side offtake of the column.

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