Patent · US Expired

Method of removing water from a dilute solution of N-methylmorpholine-N-oxide, N-methylmorpholine, or morpholine

US5118423A · kind A · utility

6Cited by

4References

4Claims

0Family size

Assignee

LENZING AKTIENGESELLSCHAFT · AT

Inventors

Stephan Astegger · Vöcklabruck, AT
Dieter Eichinger · Vöcklabruck, AT
Heinrich Firgo · Vöcklabruck, AT
Karin Weinzierl · Vöcklabruck, AT
Bernd Wolschner · Vöcklabruck, AT
Stefan Zikeli · Regau, AT

Key dates

Filing date	Mar 27, 1991
Grant date	Jun 2, 1992
Priority date	—
Expiry date	Mar 27, 2011

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P70/62
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

For the removal of water from dilute aqueous solution of NMMO, N-methylmorpholine or morpholine or mixtures thereof, the solution is subjected to reverse osmosis at a pressure in excess of the osmotic pressure and probably around 40 bar and a temperature of 25.degree. C. to 75.degree. C. to form a retentate containing the amines and a permeate which is practically free from the amines. The permeate can be used as process water while the retentate can be worked up to NMMO for reuse in the cellulose solubilization process.

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