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1. (WO2018137987) METHOD FOR THE PRODUCTION OF POLYETHER POLYOLS

Pub. No.:    WO/2018/137987    International Application No.:    PCT/EP2018/051163
Publication Date: Fri Aug 03 01:59:59 CEST 2018 International Filing Date: Fri Jan 19 00:59:59 CET 2018
IPC: C08G 65/30
Applicants: HUNTSMAN INTERNATIONAL LLC
Inventors: TERMORSHUIZEN, Paul Anton
CANTERO, Hector
Title: METHOD FOR THE PRODUCTION OF POLYETHER POLYOLS
Abstract:
The invention is related to a method for preparing polyether polyols, wherein the method comprises the steps of: a) providing a crude polyether polyols and a base catalyst; b) mixing the crude polyether polyols mixture with an acid thereby providing a neutralized polyether polyols mixture; c) removing water from the neutralized polyether polyols mixture, thereby providing a dehydrated neutralized polyether polyols mixture comprising polyether polyols and a suspension of the crystallized salts suspended in the polyether polyols; d) separating the polyether polyols from the crystallized salt by filtration resulting in a filtration cake comprising crystallized salts and remaining polyether polyols around the crystals; e) removing polyether polyols from the filter, leaving a filtration cake; f) redissolving the filtration cake obtaining a mixture of a salt solution and the remaining polyether polyols; and separating and removing the remaining polyether polyols from the salt solution.