Patent · US Expired

Process for the separation and purification of cellulose ethers and cellulose derivatives

US4963271A · kind A · utility

12Cited by

3References

15Claims

0Family size

Assignee

Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

Wilfried Raehse · Goldkronach, DE
Willi Wuest · Ratingen, DE
Norbert Kuehne · Haan, DE

Key dates

Filing date	Aug 31, 1988
Grant date	Oct 16, 1990
Priority date	—
Expiry date	Aug 31, 2008

Classification

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

Abstract

A process and apparatus for the separation and purification of cellulose ethers and other cellulose derivatives in a filter unit at relatively high temperatures and with narrow-mesh filters, employing a pressure vessel having candle filters to which pressure is introduced for separation of the suspension liquid, for the removal of residual liquid from the filter cake formed, and also for washing the filter cake.

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