Patent ID: 8354559
Filing Date: 2013-01-15
Classification: B01J,C08G

Abstract:
1. A process for purifying a crude polyether obtained by ring opening polymerization of an alkylene oxide or a cyclic compound containing an alkylene oxide with an initiator having at least one hydroxyl group, in the presence of a double metal cyanide complex catalyst, said process comprising adding, directly following the ring opening polymerization, a powder of an inorganic adsorbent containing at least 50 vol % of fine particles having a particle size of at most 26 μm and further containing at least 90 vol % of fine particles having a particle size of at most 44 μm, to the crude polyether to let a metal derived from the above double metal cyanide complex catalyst remained in the polyether phase be adsorbed on the above powder; and further separating the above powder from the above polyether.