公开(公告)号：AT384753T

公开(公告)日：2008-02-15

申请号：AT05744275

申请日：2005-04-21

Applicant: BASF AG

Inventor： OSTROWSKI THOMAS ,  RUPPEL RAIMUND ,  HOEPPNER GERD ,  BERGMANN SASCHA ,  VANDEWALLE KOEN ,  BAUM EVA

IPC: C08G65/26 ,  C08G18/48

Abstract: Process for preparing polyether polyols having an end block of ethylene oxide by addition of alkylene oxides onto H-functional starter substances, in which A) a polyether polyol precursor is prepared by means of double metal cyanide (DMC) catalysis in a semicontinuous mode of operation in which previously prepared polyether polyol together with the DMC catalyst are placed in a reactor and H-functional starter substance and propylene oxide are added continuously, B) the polyether polyol precursor from stage A) is reacted with propylene oxide or an ethylene oxide/propylene oxide mixture in the presence of the DMC catalyst in a continuously operating reactor to give a polyether polyol intermediate, C) the intermediate from stage B) is mixed with an alkali metal hydroxide as catalyst and D) reacted with ethylene oxide in a continuously operating reactor to give the final product, E) the catalyst is separated off from the final product obtained in stage D).

公开(公告)号：DE602005004539D1

公开(公告)日：2008-03-13

申请号：DE602005004539

申请日：2005-04-21

Applicant: BASF AG

Inventor： OSTROWSKI THOMAS ,  RUPPEL RAIMUND ,  HOEPPNER GERD ,  BERGMANN SASCHA ,  VANDEWALLE KOEN ,  BAUM EVA

IPC: C08G65/26 ,  C08G18/48

Abstract: Process for preparing polyether polyols having an end block of ethylene oxide by addition of alkylene oxides onto H-functional starter substances, in which A) a polyether polyol precursor is prepared by means of double metal cyanide (DMC) catalysis in a semicontinuous mode of operation in which previously prepared polyether polyol together with the DMC catalyst are placed in a reactor and H-functional starter substance and propylene oxide are added continuously, B) the polyether polyol precursor from stage A) is reacted with propylene oxide or an ethylene oxide/propylene oxide mixture in the presence of the DMC catalyst in a continuously operating reactor to give a polyether polyol intermediate, C) the intermediate from stage B) is mixed with an alkali metal hydroxide as catalyst and D) reacted with ethylene oxide in a continuously operating reactor to give the final product, E) the catalyst is separated off from the final product obtained in stage D).