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公开(公告)号：DE102005042609A1
公开(公告)日：2007-03-08
申请号：DE102005042609
申请日：2005-09-07
Applicant: BASF AG
Inventor： WEISMANTEL MATTHIAS , MARCO MICHAEL DE , DAIS ANDREAS , ESBROECK DOMINICUS VAN , POSSEMIERS KARL J , KAEY RONNY DE , MIERT LEO VAN
Abstract: The invention relates to a process for continuously preparing water-absorbing polymer particles by mixing a monomer solution with a redox initiator consisting of at least one oxidizing agent and at least one reducing agent and polymerizing it, wherein the monomer solution is mixed with at least one oxidizing agent upstream of the polymerization reactor and the at least one reducing agent is metered into the polymerization reactor, and also to an apparatus for performing the process.
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公开(公告)号：DE102005042604A1
公开(公告)日：2007-03-08
申请号：DE102005042604
申请日：2005-09-07
Applicant: BASF AG
Inventor： WEISMANTEL MATTHIAS , MARCO MICHAEL DE , ESBROECK DOMINICUS VAN , POSSEMIERS KARL J , KAEY RONNY DE
Abstract: Neutralization procedure comprises partially neutralizing at least an ethylenically unsaturated carboxylic acid compound with a base, where the neutralization takes place in a continuous process and the neutralized solution is at less than 70[deg]C. Independent claims are included for: (1) a procedure for production of water-absorbing polymer comprising a neutralization procedure; and (2) a device for continuous neutralization comprising a circular pipe (R), at least a first supply pipe (Z 1) and second supply pipe (Z 2) in the circular pipe, at least a heat exchanger (W 1) in the circular pipe, where the heat exchanger flows directly behind the supply pipes, at least a conduit (A), which flows directly behind the heat exchanger, a pump (P) and optionally a container (B) between the heat exchanger and the conduit.
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Patent Agency Ranking
公开(公告)号：DE102005031114A1
公开(公告)日：2007-01-18
申请号：DE102005031114
申请日：2005-07-04
Applicant: BASF AG
Inventor： HILLEBRECHT ANNEMARIE , STUEVEN UWE , MIERT LEO , ESBROECK DOMINICUS VAN , BRIAN BERND , CHSZANIECKI SIEGFRIED
Abstract: The invention relates to the use of an apparatus for adding at least one solid or viscous liquid additive, or an additive dispersed in solvent, to a reactor interior of a reactor for preparing crosslinked, finely divided polymers by copolymerizing (a) water-soluble, monoethylenically unsaturated monomers and (b) from 0.001 to 5 mol %, based on the monomers (a), of monomers comprising at least two polymerizable groups, (c) from 0 to 20 mol %, based on the monomers (a), of water-insoluble monoethylenically unsaturated monomers, where the apparatus comprises at least one screw for conveying the at least one additive and the at least one screw ends in an addition orifice substantially flush with the inner wall of the reactor interior.
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公开(公告)号：DE102005014291A1
公开(公告)日：2006-09-28
申请号：DE102005014291
申请日：2005-03-24
Applicant: BASF AG
Inventor： WEISMANTEL MATTHIAS , BRUHNS STEFAN , ESBROECK DOMINICUS VAN
Abstract: Preparation of water-absorbing polymers (A) with drying quality index comprises polymerizing a monomer solution and drying the obtained hydrogel agent in hot-gas flow, where the drying process takes place in at least two temperature zones, when the flow of the hydrogel in the gas flow is: downwards in the front side of the volume drier, and upwards against the rear side of the drier; where the amount of water in the hydrogel is 15-45 wt.%, the hydrogel layer in the volume drier flows at least partially against down wards, and the speed of the gas is 5-30%. Preparation of water-absorbing polymers (A) with drying quality index comprises polymerizing a monomer solution and drying the obtained hydrogel agent in hot-gas flow, where the drying process takes place in at least two temperature zones, when the gas inlet temperature (T n) is not equal to T n + a; and flow of the hydrogel in the gas flow is: downwards in the front side of the volume drier, and upwards against the rear side of the drier; where the amount of water in the hydrogel is 15-45 wt.%, the hydrogel layer in the volume drier flows at least partially against down wards, and the speed of the gas is 5-30%. n : index; and a : greater than 0. An independent claim is included for a device for drying (A) comprising a gas permeable conveyer belt (which is streamed by a preheated gas), where the gas inlet temperature is adjusted such that it can come form at least two temperature zones.
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公开(公告)号：DE102005062929A1
公开(公告)日：2007-07-05
申请号：DE102005062929
申请日：2005-12-29
Applicant: BASF AG
Inventor： STUEVEN UWE , DANIEL THOMAS , FUNK RUEDIGER , WEISMANTEL MATTHIAS , ESBROECK DOMINICUS VAN , POSSEMIERS KARL J
IPC: C08F2/44 , C08F220/06 , C08F283/06 , C08J3/075
Abstract: Preparation of water-absorbing resin by polymerization of a reaction mixture comprising at least one hydrophilic monomer and optionally at least one cross-linker, comprises mixing at least a first portion of a particulate additive in the reaction mixture, before the reaction mixture reaches a retention time of 40% of the total retention time in the reactor; and mixing at least a second portion of a particulate additive in the reaction mixture, when the reaction mixture reaches a retention time of 45% or more of the total retention time in the reactor. Preparation of water-absorbing resin by polymerization of a reaction mixture comprising at least one hydrophilic monomer and optionally at least one cross-linker, in a reactor, comprises mixing at least a first portion of a particulate additive in the reaction mixture, before the reaction mixture reaches a retention time of 40% of the total retention time in the reactor; and mixing at least a second portion of a particulate additive in the reaction mixture, when the reaction mixture reaches a retention time of 45% or more of the total retention time in the reactor, where: the additive is a water-adsorbing resin powder and/or filler; the total solid content of the monomer and additive is 30-60 wt.%; the amount of the additive is 5-50 wt.%, based on the monomer; and the weight ratio of the first fraction to the second fraction of the additive is 10:10-1:5.
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公开(公告)号：DE102005042608A1
公开(公告)日：2007-03-08
申请号：DE102005042608
申请日：2005-09-07
Applicant: BASF AG
Inventor： WEISMANTEL MATTHIAS , MARCO MICHAEL DE , DAIS ANDREAS , ESBROECK DOMINICUS VAN , POSSEMIERS KARL J , KAEY RONNY DE , MIERT LEO VAN
Abstract: The present invention relates to a process for continuously preparing water-absorbing polymers by mixing a monomer solution with at least one crosslinker and polymerizing the resulting mixture, wherein the residence time of the mixture between the addition of the at least one crosslinker and the entry into the polymerization reactor is less than 180 seconds, and also to an apparatus for performing the process.
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公开(公告)号：DE102005042607A1
公开(公告)日：2007-03-08
申请号：DE102005042607
申请日：2005-09-07
Applicant: BASF AG
Inventor： WEISMANTEL MATTHIAS , FUNK RUEDIGER , ESBROECK DOMINICUS VAN , POSSEMIERS KARL J , KAEY RONNY DE , MIERT LEO VAN
Abstract: The invention relates to a process for preparing water-absorbing polymer particles, comprising the inertization of monomer solutions, wherein the monomer solution, based on the dissolved monomer, comprises from 0.001 to 0.016% by weight of at least one polymerization inhibitor and at least 50% by volume of the inert gas used to inertize the monomer solution is transferred into the polymerization reactor together with the inertized monomer solution, and also to apparatus for performing the process.
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