公开(公告)号：ES2190025T3

公开(公告)日：2003-07-16

申请号：ES98118312

申请日：1998-09-25

Applicant: BASF AG

Inventor： AUER HEINZ ,  BEISER KLAUS ,  CIPRIAN JURGEN DR ,  FRANZ LOTHAR DR ,  FRANZISCHKA WOLFGANG DR ,  PESSEL ULRICH-DIETER

IPC: B01J19/00 ,  B01J19/18 ,  C08G65/20 ,  C08G65/30 ,  C08G65/32 ,  C08G65/331

Abstract: The foam produced during the continuous production of hydroxyl (OH) group terminated polytetrahydrofuran is removed and by transesterification of the corresponding ester group containing polymer. A process for preparing OH group containing polymers, especially for preparing polytetrahydrofuran with terminal OH groups, by transesterification of the corresponding ester group-containing polymers with alcohols. Tranesterification is carried out continuously in at least one stirred reactor (I,II,III,IV), where at least one reactor (I,II,III,IV) being connected via a line (3,3') to a generally cylindrical container (5,13'), with a diameter of about 2-4 times the diameter of the line (3,3'), to take up the foam formed in the stirred reactor(s) (I,II,III,IV) and to pass the foam tangentially into the cylindrical container (5,13) at a speed sufficient to separate the foam into a gaseous phase and a liquid phase. The gas phase is led off via a line (9) and the liquid phase is led off via a line (7,15).

公开(公告)号：ES2209047T3

公开(公告)日：2004-06-16

申请号：ES98124438

申请日：1998-12-22

Applicant: BASF AG

Inventor： BEER WULF FRIEDEMANN DR ,  BEISER KLAUS ,  CIPRIAN JURGEN DR ,  FRANZ LOTHAR DR ,  FRANZISCHKA WOLFGANG DR ,  PALM CHRISTOF DR

IPC: B01J39/04 ,  B01J39/05 ,  B01J47/02 ,  B01J47/026 ,  B01J49/00 ,  B01J49/06 ,  C08F6/08 ,  C08G65/20 ,  C08G65/30 ,  C08G65/331 ,  C08J5/20

Abstract: The production of a hydroxyl group containing polymer, preferably polytetrahydrofuran, by ester exchange of the corresponding acyloxy group containing polymer with alcohol in the presence of a sodium containing catalyst involves separation of the sodium cation using a catalytic amount of water by passage through an ion exchange material.