# US 10,499,647 B2 · Use of an encapsulated chlorine bleach particle to reduce gas evolution during dispensing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,499,647 B2 - Document ID: US10499647B2 - Status: Granted - Kind: B2 - Application number: 15/402,736 - Filed: 2017-01-10 - Published: 2018-07-12 - Granted: 2019-12-10 - Earliest claimed: 2017-01-10 - Assignees: Ecolab USA Inc. - Applicants: Ecolab USA Inc. - Inventors: Jonathan P. Fast; John Nordling - Web page: https://patentgrep.com/patent/US10499647B2 ## CPC - A01N 59/00: Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds - C02F 1/688: {Devices in which the water progressively dissolves a solid compound} - C02F 1/76: with halogens or compounds of halogens {(C02F1/4674 takes precedence)} - C02F 2103/023: {Water in cooling circuits} - C02F 2303/04: Disinfection - A01N: PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF (preservation of food or foodstuff A23); BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES (preparations for medical, dental or toiletry purposes which kill or prevent the growth or proliferation of unwanted organisms A61K); PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS - C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes) ## Abstract The present disclosure relates to use of an encapsulated chlorine bleach to reduce gas evolution when reacted with sodium bromide during dispensing. The compositions include a coated chlorine combined with the sodium bromide which beneficially suppresses the chemical reaction, and therefore gas release, while providing a single, solid, all-in-one composition. Compositions, methods of dispensing and methods of use are disclosed. ## Claims ### Claim 1 A method of dispensing a biocidal composition comprising: providing a solid biocide composition to an external dispenser, wherein the composition comprises from about 70 wt-% to about 99 wt-% of a coated chlorine and from about 1 wt-% to about 30 wt-% of a bromide salt; intermittently contacting a water source onto the solid biocide composition through the external dispenser, initiating a reaction between the water source, coated chlorine, and bromide salt at a wet interface on the solid biocide composition; and generating an aqueous biocide solution of hypobromous acid and/or hypobromite from the reaction, wherein the aqueous biocide solution carries bromine gas generated by the solid biocide composition into a fluid delivery system, and wherein the coated chlorine is chloroisocyanurate or chloroisocyanuric acid, trichloroisocyanuric acid, dichloroisocyanuric acid or salt thereof, coated by a sulfate, tripolyphosphate, or combination thereof, and reduces the concentration of bromine gas generated from the solid biocide composition in the presence of residual water in the external dispenser when the water source is not contacting the solid biocide. ### Claim 2 (depends on 1) The method of claim 1, wherein the coated chlorine has at least about 50% available chlorine in its base chlorine before it is coated. ### Claim 3 (depends on 1) The method of claim 1, wherein the coated chlorine provides a physical barrier between the chlorine and the bromide salt to prevent premature reaction in the dispenser and delays the reaction. ### Claim 4 (depends on 3) The method of claim 3, wherein the reaction is delayed until the solid biocide composition is in contact with water in a dispensing line or a bulk water system. ### Claim 5 (depends on 1) The method of claim 1, wherein the solid biocide composition is a pellet, tablet, lozenge, puck, briquette, brick, or block, and wherein the solid biocide composition is a multi-use solid. ### Claim 6 (depends on 1) The method of claim 1, wherein the solid biocide composition has a weight from about 100 grams to about 10 kilograms. ### Claim 7 (depends on 1) The method of claim 1, wherein the water source is dosed for from about 30 seconds to about 5 minutes. ### Claim 8 (depends on 1) The method of claim 1, wherein the external dispenser is physically separated from a main water system. ### Claim 9 (depends on 1) The method of claim 1, wherein the reduction in concentration of bromine gas is at least about 2 times compared to the concentration of bromine gas generated by a non-coated chlorine reagent. ### Claim 10 (depends on 1) The method of claim 1, wherein the reduction in concentration of bromine gas is at least about 3 times compared to the concentration of bromine gas generated by a non-coated chlorine reagent. ### Claim 11 (depends on 1) The method of claim 1, wherein the reduction in concentration of bromine gas is at least about 5 times compared to the concentration of bromine gas generated by a non-coated chlorine reagent. ### Claim 12 (depends on 1) The method of claim 1, wherein the solution of hypobromous acid and/or hypobromite has pH from about 7 to about 10. ### Claim 13 (depends on 1) The method of claim 1, wherein the coated chlorine comprises from about 85 wt-% to about 99 wt-% of the solid biocide composition and the bromide salt comprises from about 1 wt-% to about 15 wt-% of the solid biocide composition.