Demand bactericide for disinfecting water and process of preparation

Claim 2

THE PROCESS FOR PRODUCING A TRIIODIDE DEMAND BACTERICIDE, COMPRISING PREPARING AN AQUEOUS SOLUTION OF IODINE WHICH IS PRESENT THEREIN ESSENTIALLY AS TRIIODIDE IONS (I3-), CONTACTING SAID TRIIODIDE SOLUTION WITH A POROUS GRANULAR STRONG BASE ANION EXCHANGE RESIN HAVING THE STRONGLY BASIC GROUPS THEREOF IN A SALT FORM REACTABLE WITH TRIIODIDE IONS, AND CONTACTING BEING CONTINUED UNTIL SUFFICIENT TRIIODIDE HAS REACTED WITH SAID STRONGLY BASIC GROUPS THAT BACTERIALLY CONTAMINATED WATER IS DISINFECTED WHEN PASSED THROUGH A BED OF THE REACTED RESIN, AND REMOVING WATER-ELUTABLE IODINE FROM SAID RESIN, SAID REMOVING BEING CONTINUED UNTIL THE REACTED RESIN CAN BE WASHED WITH DISTILLED WATER AT A TEMPERATURE OF 25* TO 30*C. WITHOUT OBTAINING IN THE WASH WATER A CONCENTRATION OF OXIDIZING IODINE DETECTABLE BY REACTING SAID WASH WATER WITH A CADMIUM IODIDE-LINEAR STARCH TEST REAGENT.

Claim 3

THE TRIIODIDE DEMAND BACTERICIDE PRODUCED BY THE PROCESS OF CLAIM 1.

Claim 4

The process of claim 1 in which said strongly basic groups of said resin are quaternary ammonium groups.

Claim 5

The process of claim 1 in which said quaternary ammonium groups are benzyl trimethyl ammonium groups.

Claim 6

The process of claim 4 in which said quaternary ammonium groups before said contacting are in a salt form selected from the class consisting of chloride and sulfate.

Claim 7

The process for producing a triiodide demand bactericide, comprising preparing an aqueous solution of iodine which is present therein essentially as triiodide ions (I3 ), contacting said triiodide solution with a porous granular quaternary ammonium anion exchange resin containing said quaternary ammonium groups as benzyl trimethyl quaternary ammonium groups in a salt form reactable with triiodide ions, said contacting being continued until sufficient triiodide has reacted with said quaternary ammonium groups that bacterially contaminated water is disinfected when passed through a bed of the reacted resin, and removing water-elutable iodine from said resin, said removing being continued until the reacted resin can be washed with distilled water at a temperature of 25* to 30*C. without obtaining in the wash water a concentration of oxidizing iodine detectable by reacting said wash water with a cadmium iodide-linear starch test reagent.

Claim 8

The process for producing a triiodide demand bactericide, comprising preparing an aqueous solution of iodine which is present therein essentially as triiodide ions (I3 ), contacting said triiodide solution with a porous granular quaternary ammonium anion exchange resin containing said quaternary ammonium groups as benzyl trimethyl quaternary ammonium groups in a salt form reactable with triiodide ions, said contacting being continued until sufficient triiodide has reacted with said quaternary ammonium groups that bacterially contaminated water is disinfected when passed through a bed of the reacted resin, and removing water-elutable iodine from said resin, said removing being continued until the reacted resin can be washed with distilled water at a temperature of 25* to 30*C. without obtaining in the wash water a concentration of oxidizing iodine detectable by reacting said wash water with a cadmium iodide-linear starch test reagent.

Claim 9

The triiodide demand bactericide produced by the process of claim 6, said bacteriCide being further characterized by containing sufficient triiodide to kill 100 percent of the bacteria in water passed therethrough up to a bacterial concentration in said water of 106 bacteria per milliliter.

Claim 10

The process of claim 6 in which said quaternary ammonium groups before said contacting are in a salt form selected from the class consisting of chloride and sulfate.

Claim 11

The process for producing a demand bactericide, comprising reacting a quaternary ammonium anion exchange resin containing residual tertiary amine groups with an alkylating reagent to convert the tertiary amine groups therein to quaternary ammonium groups, said alkylating agent providing alkyl groups of from 1 to 4 carbons, the resulting anion exchange resin containing essentially only quaternary ammonium groups as the anion exchange groups therein, converting the anion exchange groups of said resin to the triiodide salt form thereof, and washing said converted resin with water until said resin is essentially free of water-elutable triiodide.

Claim 12

The process for producing a demand bactericide, comprising reacting a quaternary ammonium anion exchange resin containing residual tertiary amine groups with an alkylating reagent to convert the tertiary amine groups therein to quaternary ammonium groups, said alkylating agent providing alkyl groups of from 1 to 4 carbons, the resulting anion exchange resin containing essentially only quaternary ammonium groups as the anion exchange groups therein, converting the anion exchange groups of said resin to the triiodide salt form thereof, and washing said converted resin with water until said resin is essentially free of water-elutable triiodide.

Claim 13

The process of claim 9 in which said alkylating reagent is a methylating reagent.

Claim 14

The process of claim 10 in which said methylating reagent is dimethyl sulfate.

Claim 15

The process of claim 9 in which said alkylated quaternary ammonium resin prior to said conversion is in a salt form other than the iodide form.