Rohm and Haas Company

Rohm and Haas

Berni P Chong

James Watson Neely

Eric G Isacoff

Warren T Ford

Glenn H Beasley

Robert R Rowe

Conventional filter aid materials are treated with anion exchange resin materials having particle diameters smaller than 1 micrometer to produce an improved filter aid material bearing a fixed monolayer of the anion exchange resins.

Filter aid materials bearing anion exchange resins

Emulsion copolymer particles with diameters smaller than 1.5 micrometers and functionalized with cation exchange functional groups are prepared and suspended as emulsions in liquid media to form liquid cation exchange materials.

Emulsion copolymer cation exchange resins

Emulsion copolymer particles with diameters less than 1.5 micrometers are functionalized with anion exchange functional groups by a method involving coagulation of the emulsion. Both weakly basic and strongly basic anion exchange resins are prepared from aromatic or acrylic copolymers, and the emulsion coagula may be resuspended to form anion exchange emulsions.

Emulsion copolymer anion exchange resins

Flocs prepared by mixing cationic and anionic emulsion ion exchange resins are useful as a filtration and deionization medium. Flocs prepared from weakly acidic and weakly basic emulsion ion exchange resins may be regenerated thermally.

Filtration and deionization prepared from cationic and anionic emulsion

Macroporous styrene polymer particles which have been partially pyrolyzed at temperatures between 300.degree. and 800.degree. C. to form non-functionalized, carbonaceous adsorbents, are functionalized according to this invention to produce weak base, strong base, weak acid or strong acid, dense ion exchange particles, or precursors thereof, using such reactions as halogenation, sulfonation, chloromethylation, chlorosulfonation and oxidation, alone or followed by aminolysis or other conventional functionalization reactions.

Ion exchange material prepared from partially pyrolyzed macroporous

Flocs for filtration and deionization prepared from cationic and anionic

Ions are exchanged between emulsion ion exchange resins and conventional ion exchange resins during both batch and column contact. This process may be used to place the emulsion resin or the conventional resin in the desired ionic form.

Ion exchange process involving emulsion ion exchange resins

Beads of an inert, crosslinked copolymer of methyl methacrylate and hydroxyalkyl methacrylate are used as an interface separator during the regeneration of mixed-bed ion exchange columns; the beads have a settling rate intermediate between that of the cation and anion exchange resins of the mixed-bed system.

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North Wales, PA, United States of America

Berni P Chong