EP 0000944 A1 19790307 - Filtration process for purifying polyols.
Title (en)
Filtration process for purifying polyols.
Title (de)
Filtrationsverfahren zur Reinigung von Polyolen.
Title (fr)
Procédé de filtration pour la purification de polyols.
Publication
Application
Priority
US 82943677 A 19770831
Abstract (en)
Filtration process for purifying polyols. The alkaline catalyst used for the preparation of the polyether polyol is removed by mixing the crude polyol with water, an adsorbent and a solvent; the mixing is followed by filtration. The filter cake is washed with the solvent. The solvent and water are removed from the polyol by means of a flash stripper. The solvent can be an aliphatic, alicyclic or aromatic hydrocarbon, a dialkylketone, a dialkyl ether, a halogenated hydrocarbon or a mixture thereof; the solvent is recycled.
IPC 1-7
IPC 8 full level
C08G 65/30 (2006.01)
CPC (source: EP)
C08G 65/30 (2013.01)
Citation (search report)
- GB 1369304 A 19741002 - MARLES KUHLMANN WYANDOTTE SOC
- US 4029879 A 19770614 - MUZZIO JOHN A
- CHEMICAL ABSTRACTS, vol. 81, abstract no. 50462v, 1974, COLUMBUS, Ohio (USA) & SU-A-392 078 (SIMENIDO A.V. et al.)
Designated contracting state (EPC)
BE DE FR
DOCDB simple family (publication)
DOCDB simple family (application)
EP 78100738 A 19780824