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公开(公告)号:AU2003293754A8
公开(公告)日:2004-06-30
申请号:AU2003293754
申请日:2003-12-03
Applicant: BASF AG
Inventor: ELLIOT MARK , EXNER KAI MICHAEL , BENNETT ANDREA KAREN , CIPRIAN JURGEN
Abstract: A process for the reduction of the concentration of methoxyhydroquinone (MEHQ) in acrylic acid that is neutralized to 75-100% comprises continuous adsorption on activated carbon. An Independent claim is included for a process for the production of superabsorbers (I) by reduction of the MEHQ content by the novel process followed by polymerization, optionally with non-neutralized acrylic acid with optionally surface cross-linking.
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公开(公告)号:ES2203120T3
公开(公告)日:2004-04-01
申请号:ES99917985
申请日:1999-04-15
Applicant: BASF AG
Inventor: AUER HEINZ , CIPRIAN JURGEN , FRANZ LOTHAR , FRANZISCHKA WOLFGANG , IFFLAND GABRIELE , WECK ALEXANDER
IPC: C08G65/20 , C08G65/30 , C08G65/32 , C08G65/331
Abstract: The present invention relates to a process for preparing hydroxyl-containing polymers, in particular for preparing polytetrahydrofuran with terminal hydroxyl groups, from the corresponding acyloxy-containing polymers by transesterification with alcohols in the presence of an alkali metal- or alkaline earth metal-containing catalyst, which entails the appropriate acyloxy-containing polymer being introduced together with the alcohol and the catalyst into a first prereactor (I) and converted therein at least partly to the hydroxyl-containing polymer, and the reaction solution being fed into the upper zone (IIa) of a distillation column (II) into whose lower zone (IIb) alcohol in vapor phase is additionally fed. This involves a phase exchange at the coherent and the disperse phase at the transition from the prereactor to the distillation column. Preferably, in addition to the first prereactor, a further 3 prereactors are used which serve as holdup reactors.
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公开(公告)号:ES2233867T3
公开(公告)日:2005-06-16
申请号:ES02776935
申请日:2002-08-20
Applicant: BASF AG
Inventor: CIPRIAN JURGEN , BEER WULFRICH FRIEDEMANN , MENGER VOLKMAR
IPC: C08G65/20 , C08G65/26 , C08G65/30 , C08G65/331
Abstract: Procedimiento para la fabricación de una disolución alcohólica de politetrahidrofurano con grupos OH terminales (PTHF) a partir del correspondiente éter de politetrametileno con grupos aciloxi terminales mediante transesterificación con alcoholes en presencia de un catalizador que contiene metal alcalino o alcalinotérreo, en el que inmediatamente tras la transesterificación la disolución de PTHF se conduce a través de al menos un intercambiador iónico para la separación de los iones metálicos alcalinos o alcalinotérreos en presencia de una cantidad catalítica de agua, caracterizado porque la separación de los iones metálicos alcalinos o alcalinotérreos se realiza en una instalación de intercambio iónico totalmente continua, que presenta: - varias celdas de intercambio iónico (Z) que se disponen en una plataforma giratoria respectivamente con un elemento distribuidor y uno colector y - una válvula central (V) con un disco de estator (S) y un disco de rotor (R), a través de los cuales se realiza la carga y descarga de todos los flujos de líquidos en la instalación de intercambio iónico, así como con - conducciones de carga (a) y descarga (b) desde el elemento distribuidor o elemento colector de cada celda de intercambio iónico (Z) hacia la válvula central (V).
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公开(公告)号:AU2003293754A1
公开(公告)日:2004-06-30
申请号:AU2003293754
申请日:2003-12-03
Applicant: BASF AG
Inventor: BENNETT ANDREA KAREN , CIPRIAN JURGEN , ELLIOT MARK , EXNER KAI MICHAEL
Abstract: A process for the reduction of the concentration of methoxyhydroquinone (MEHQ) in acrylic acid that is neutralized to 75-100% comprises continuous adsorption on activated carbon. An Independent claim is included for a process for the production of superabsorbers (I) by reduction of the MEHQ content by the novel process followed by polymerization, optionally with non-neutralized acrylic acid with optionally surface cross-linking.
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公开(公告)号:AU1520001A
公开(公告)日:2001-06-06
申请号:AU1520001
申请日:2000-11-08
Applicant: BASF AG
Inventor: BERRSCHE HELMUT , GABEL SABINE , IFFLAND GABRIELE , CIPRIAN JURGEN , WENZEL ANNE , TELES JOAQUIM HENRIQUE , REHFINGER ALWIN DR
IPC: B01J47/00 , B01J47/02 , B01J47/026 , C01B15/013 , C07D301/12
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