Abstract:
Shreds of a treated cellulosic paper are randomly gathered as an aggregation which permits passage of water. The paper contains chemical functionality which selectively absorbs dissolved ionic metal species from water. This invention is based in part upon the discovery that a protonated form of PEI, created by addition of acid species to PEI (to produce a pH in the range of 4.5 to 6.8), can undergo thermally induced chemical reaction with cellulose to impart ion exchange properties without decomposition. Furthermore, by utilizing PEI of exceptionally high molecular weight, cellulose substrates thus treated, particularly paper and paper pulp, have sufficient ion exchange capacity to be of commercial value; for example, and not by limitation, they can be shredded and formed into aggregations providing specialized performance in fixed bed absorption operations.
Abstract:
Die Erfindung betrifft ein Verfahren zur Herstellung von aminomethylierten Perlpolymerisaten unter Verwendung von kondensierten Formaldehyden und Carbonsäureanhydriden.
Abstract:
Die Erfindung betrifft ein Verfahren zur Herstellung von aminomethylierten Perlpolymerisaten aus N-Carbonsäuremethylphthalimidestern, die als Anionenaustauscher verwendet werden oder zu Chelatharzen weiter umgesetzt werden können.
Abstract:
A method of removing chromium from water using a weak base anion exchange resin at a pH above about 5 includes the step of periodically reducing a flow of the water through the ion exchange resin for a rest period, such that a secondary mechanism of chromium removal predominates, wherein chromium ions are removed from the weak base anion exchange groups and precipitated inside the ion exchange resin. In an alternative embodiment, rather than resting, the ion exchange resin is periodically conditioned with an acid so as to enhance the secondary mechanism.
Abstract:
An ion exchange polymer is provided. The ion exchange polymer is a reaction product of a reaction between a crosslinker monomer and a cationic monomer. The crosslinker monomer is a reaction product of a reaction between a first crosslinking monomer and a second crosslinking monomer. Further, the cationic monomer comprises a quaternary ammonium group. A method for making an ion exchange polymer is also provided. The method comprises a step of preparing a curable solution and a step of curing the curable solution. The step of preparing the curable solution comprises mixing a pair of crosslinking monomers, a cationic monomer that comprises a quaternary ammonium group and an acid. A membrane is also provided. The membrane comprises the ion exchange polymer made by the method provided.
Abstract:
The present invention relates to removal of selenium from feeds such as waste water streams from refineries and power plants. In particular, the present invention provides adsorbents, uses of those adsorbents and methods of removing selenium.
Abstract:
The present invention relates to removal of selenium from feeds such as waste water streams from refineries and power plants. In particular, the present invention provides adsorbents, uses of those adsorbents and methods of removing selenium.
Abstract:
Porous polymeric networks and composite materials comprising metal nanoparticles distributed in the polymeric networks are provided. Also provided are methods for using the polymeric networks and the composite materials in liquid- and vapor-phase waste remediation applications. The porous polymeric networks, are highly porous, three-dimensional structures characterized by high surface areas. The polymeric networks comprise polymers polymerized from aldehydes and phenolic molecules.
Abstract:
The present invention relates to chemically modified hollow fiber materials for extracorporeally removing exotoxins produced by pathogenic Escherichia coli from protein containing liquids, particularly from blood or plasma, as well as the use in treating patients suffering from diseases which, for example, are caused by enterohemorrhagic Escherichia coli bacteria (EHEC infections) or other pathogenic Escherichia coli like enterotoxigenic Escherichia coli (ETEC) or enteroaggregative Escherichia coli (EAEC).