# US 2019/0313672 A1 · Method for producing chlorous acid aqueous solution by adsorption of chlorine dioxide > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0313672 A1 - Document ID: US20190313672A1 - Status: Published application - Kind: A1 - Application number: 16/395,191 - Filed: 2019-04-25 - Published: 2019-10-17 - Earliest claimed: 2013-12-20 - Assignees: Honbu Sankei Co., Ltd. - Applicants: Honbu Sankei Co., Ltd. - Inventors: Hisataka GODA - Web page: https://patentgrep.com/patent/US20190313672A1 ## CPC - A23B 2/788: Inorganic compounds - A01N 59/00: Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds - C01B 11/08: Chlorous acid - A23V 2002/00: Food compositions, function of food ingredients or processes for food or foodstuffs - A23B: PRESERVATION OF FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES; CHEMICAL RIPENING OF FRUIT OR VEGETABLES - 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 - C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C} - A23V: INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION ## Abstract The present invention addresses the problem of providing a novel technique for producing aqueous chlorous acid. The present invention provides a method for producing chlorous acid, which comprises a step of adding chlorine dioxide (ClO2) to one or more components independently selected from an inorganic acid, an inorganic acid salt, an organic acid and an organic acid salt or a combination of two or more of the aforementioned components. In the method, chlorine dioxide (ClO2) is provided in the form of a gas. The method also comprises, subsequent to the above-mentioned addition step, a step of further adding one or more components independently selected from an inorganic acid, an inorganic acid salt, an organic acid and an organic acid salt or a combination of two or more of the aforementioned components. ## Claims ### Claim 1 A method of manufacturing a chlorous acid aqueous solution, comprising the step of: trapping chlorine dioxide (ClO2) with aqueous solution A comprising one of an inorganic acid, inorganic acid salt, organic acid, and organic acid salt, two or more types thereof or a combination thereof. ### Claim 2 (depends on 1) The method of claim 1, further comprising the step of adding the chlorine dioxide in the presence of hydrogen peroxide. ### Claim 3 (depends on 1) The method of claim 1, wherein a pH of the aqueous solution A is 11.0 or less and 6.0 or greater. ### Claim 4 (depends on 1) The method of claim 1, wherein a pH of the aqueous solution A is 10.8 or less and 10.2 or greater. ### Claim 5 (depends on 1) The method of claim 1, wherein the chlorine dioxide (ClO2) is provided as gas. ### Claim 6 (depends on 1) The method of claim 1, comprising, after the step of adding, a step of further adding aqueous solution B comprising one of an inorganic acid, inorganic acid salt, organic acid, and organic acid salt, two or more types thereof or a combination thereof. ### Claim 7 (depends on 1) The method of claim 1, wherein the inorganic acid is carbonic acid, phosphoric acid, boric acid, or sulfuric acid; and the inorganic acid salt is carbonate, hydroxide, phosphate, or borate. ### Claim 8 (depends on 7) The method of claim 7, wherein the carbonate is sodium carbonate, potassium carbonate, sodium bicarbonate, or potassium bicarbonate, and the hydroxide is sodium hydroxide, potassium hydroxide, calcium hydroxide, or barium hydroxide. ### Claim 9 (depends on 7) The method of claim 7, wherein the phosphate is disodium hydrogen phosphate, sodium dihydrogen phosphate, trisodium phosphate, tripotassium phosphate, dipotassium hydrogen phosphate, or potassium dihydrogen phosphate. ### Claim 10 (depends on 7) The method of claim 7, wherein the borate is sodium borate or potassium borate. ### Claim 11 (depends on 1) The method of claim 1, wherein the organic acid salt is succinic acid, citric acid, malic acid, acetic acid, or lactic acid. ### Claim 12 (depends on 1) The method of claim 1, wherein the organic acid salt is sodium succinate, potassium succinate, sodium citrate, potassium citrate, sodium malate, potassium malate, sodium acetate, potassium acetate, sodium lactate, potassium lactate, or calcium lactate. ### Claim 13 (depends on 1) The method of claim 1, wherein TAL of the aqueous solution A is 20 to 2000, wherein the TAL is found by an amount of 0.1N—HCl titration from an initial pH at or below pH of 11.0 to a pH of ### Claim 14 (depends on 6) The method of claim 6, wherein a pH of a liquid after adding the aqueous solution B is 3.2 or greater and less than 7.0, or a pH of a liquid after adding the aqueous solution B is 4.0 or greater and less than 7.0, or a pH of a liquid after adding the aqueous solution B is about 5.0 or greater and less than 7.0. ### Claim 15 (depends on 1) The method of claim 1, wherein the chlorine dioxide is present at a concentration of 0.8 to 1.0%. ### Claim 16 A chlorous acid aqueous solution manufactured by a method comprising the step of trapping chlorine dioxide (ClO2) with aqueous solution A comprising one of an inorganic acid, inorganic acid salt, organic acid, and organic acid salt, two or more types thereof or a combination thereof. ### Claim 17 (depends on 16) The chlorous acid aqueous solution of claim 16, wherein the method further comprises a step of adding the chlorine dioxide in the presence of hydrogen peroxide. ### Claim 18 (depends on 16) The chlorous acid aqueous solution of claim 16, wherein a pH of the aqueous solution A is 11.0 or less and 6.0 or greater. ### Claim 19 (depends on 16) The chlorous acid aqueous solution of claim 16, wherein a pH of the aqueous solution A is 10.8 or less and 10.2 or greater. ### Claim 20 (depends on 16, 24) The chlorous acid aqueous solution of claim 16, wherein the chlorine dioxide (ClO2) is provided as gas.