Patent · US Expired

Process for separating solvents used in the purification of products

US4985152A · kind A · utility

7Cited by

3References

6Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Josef Hilbig · Taunusstein, DE
Guenther Welt · Gau-Bischofsheim, DE
Manfred Ziegelmayer · Bischofsheim, DE

Key dates

Filing date	Jul 14, 1989
Grant date	Jan 15, 1991
Priority date	—
Expiry date	Jul 14, 2009

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01D2201/085
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

The present invention relates to a process and a device for selectively separating the solvents employed in the preparation and purification of products. In this connection the different solvents are removed from the product to be treated by means of mechanical separation and subsequent admission of steam, and are collected separately. As a result of this, mixing of solvents from the preparation and from the purification is avoided, so that the working up of a solvent mixture is superfluous. The proces and the device are preferably used in the process for producing starch ethers and cellulose ethers.

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