Method of preparation of ion exchangers by alkylation and hydroxyalkylation of polymeric hydrophilic anion exchangers
US4111859A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 1975 |
| Grant date | Sep 5, 1978 |
| Priority date | — |
| Expiry date | Feb 7, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J47/016
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention relates to a method for preparation of ion exchangers from hydrophilic anion-exchanging gels based on acrylate or methacrylate copolymers prepared by copolymerization of amino-group-containing monomers, as aminoalkyl acrylates and methacrylates, aminoalkylacrylamides and aminoalkylmethacrylamides or on gels prepared by chemical bonding of amine groups to the hydrophilic matrix of acrylate or methacrylate copolymers. The method consists in alkylation or hydroxyalkylation of amine groups by alkylating agents, as alkyl halogenides, alkyl p-toluenesulfonates, alkyl sulfates, epoxides, etc. Alkylation with alkyldiaze compounds was used for transformation of the undesired carboxylic groups of the ion exchangers. Another modification consists in the reaction of halogenated acrylate or methacrylate gels with polyamines or oligomeric polyethyleneimines. These reactions lead to ion exchangers with modified chemical nature, dissociation constant, exchange capacity, degree of hydrophility, distance of the ionogenous groups from the surface of the matrix or the character of microsurroundings. The resulting ion-exchanging materials are suitable above all for the sorption and separa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.