Preparation of ion exchange

Uses. Chemical intermediate preparation of ion-exchange resins... 

The first selective membranes based on commercial ion-exchangers were produced around 1950 (61, 68). Since that time about a hundred publications and patents concerning the preparation of ion-exchange... 

Gupta B and Anjum N. Preparation of ion-exchange membranes by hydrolysis of radiation-grafted polyethylene-g-polyacrylamide membranes. J. Appl. Polym. Sci. 2003 90 149-154. 

S 14. — — and J. Rabm Ion exchange resin matrices. XII. New trends in preparation of ion-exchange resins. Chem. Cisty 58, 651 (1963). 

In a word, ion-exchange with the assistance of microwaves is feasible, convenient, and fast. It can reach a higher exchange degree than can traditional methods and make the inaccessible ions in traditional methods exchangeable. This method is especially appropriate for the laboratory preparation of ion-exchanged zeolite molecular sieves. The microwave technique is very successful in the synthesis of microporous crystals, modification of the properties of zeolites, secondary synthesis of microporous materials, and the preparation of ultra-fine particles and films, and has attracted the wide interest of chemists in the field of molecular sieves. 

In the preparation of ion-exchange celluloses main attention is paid to their physical structure and controlled distribution of exchange groups in their mass. 

There are numerous literature references to the preparation of ion-exchange membranes by polymerization. 

Special Property Membranes. In the literature, there are numerous methods reported for the preparation of ion-exchange membranes with special properties,87-89 for instance, for use as battery separators, ion-selective electrodes, or in the chlor-alkali process. Especially membranes recently developed for the chlor-alkali industry are of commercial significance. These membranes are based on polytetrafluoroethylene and carry sulfone groups in the bulk of the membrane phase and carboxyl-groups on the surface as the charged moiety. They combine good chemical stability with high selectivity and low electric resistance. 

Preparation of Ion Exchange Membranes from Conventional Polymers... 

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