# US 2017/0283286 A1 · Sodium Nitrite Oxidation of Hydrogen Sulfide > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0283286 A1 - Document ID: US20170283286A1 - Status: Published application - Kind: A1 - Application number: 15/623,112 - Filed: 2017-06-14 - Published: 2017-10-05 - Earliest claimed: 2009-03-31 - Assignees: United Laboratories International, LLC - Applicants: United Laboratories International, LLC - Inventors: Jack G. Frost; Kenneth J. Snyder, JR. - Web page: https://patentgrep.com/patent/US20170283286A1 ## CPC - C02F 1/72: by oxidation {(C02F1/4672 takes precedence)} - C02F 1/20: by degassing, i.e. liberation of dissolved gases (degasification of liquids in general B01D19/00; arrangement of degassing apparatus in boiler feed supply F22D) - C02F 1/66: by neutralisation; pH adjustment (for degassing C02F1/20; using ion-exchange C02F1/42; for flocculation or precipitation of suspended impurities C02F1/52; for removing dissolved compounds C02F1/58) - C02F 2101/101: {Sulfur compounds} - C02F 2103/365: {from petrochemical industry (e.g. refineries)} - 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 A method for treating hydrogen sulfide in a solution includes providing the solution containing hydrogen sulfide. The method also includes adding sodium nitrite to the solution in an amount suitable to react with the hydrogen sulfide and treat the hydrogen sulfide. ## Claims ### Claim 1 A method for removing hydrogen sulfide from water, wherein the water comprises hydrogen sulfide, comprising: adding sodium nitrite to the water in an amount suitable to react with the hydrogen sulfide in the water and remove hydrogen sulfide from the water; and adding a pH buffer periodically to the water to maintain a pH of the water, wherein the pH buffer comprises citric acid, phosphoric acid, boric acid, or any combinations thereof. ### Claim 2 (depends on 1) The method of claim 1, wherein a concentration of the hydrogen sulfide in the water is about 2,000 mg/liter to about 25,000 mg/liter. ### Claim 3 (depends on 1) The method of claim 1, wherein the sodium nitrite is added at a weight ratio to hydrogen sulfide from about 0.676:1 to about 5:1. ### Claim 4 (depends on 1) The method of claim 1, wherein the water is disposed in a tank. ### Claim 5 (depends on 4) The method of claim 4, wherein the sodium nitrite is added to the tank. ### Claim 6 (depends on 1) The method of claim 1, wherein the reaction between the sodium nitrite and the hydrogen sulfide is carried out at between about 40° C. to about 70° C. ### Claim 7 (depends on 1) The method of claim 1, wherein the pH buffer comprises phosphoric acid. ### Claim 8 (depends on 1) The method of claim 1, further comprising adding a pH buffer to the water about every hour to maintain a pH of the water between about 7.0 to about 9.0 and to remove free ammonia from the water. ### Claim 9 (depends on 1) The method of claim 1, further comprising adding a pH buffer to the water about 24 hours after commencement of the reaction to maintain a pH of the water between about 7.0 to about 9.0 and to remove free ammonia from the water. ### Claim 10 (depends on 1) The method of claim 1, further comprising adding a pH buffer to the water about every hour for about a three hour segment, beginning after about the second hour of the commencement of the reaction to maintain a pH of the water between about 7.0 to about 9.0 and to remove free ammonia from the water. ### Claim 11 A method for removing hydrogen sulfide from water, wherein the water comprises hydrogen sulfide, comprising: (A) adding sodium nitrite to the water in an amount suitable to react with the hydrogen sulfide in the water and remove hydrogen sulfide from the water; (B) blowing a gas onto the water to remove ammonia formed by a reaction of sodium nitrite and the hydrogen sulfide; and (C) adding a pH buffer periodically to the water to maintain a pH of the water between about 7.0 to about 9.0 and to remove free ammonia from the water. ### Claim 12 (depends on 11) The method of claim 11, wherein the concentration of hydrogen sulfide in the water is about 2,000 mg/liter to about 25,000 mg/liter. ### Claim 13 (depends on 11) The method of claim 11, wherein the sodium nitrite is added at a weight ratio to hydrogen sulfide from about 0.676:1 to about 5:1. ### Claim 14 (depends on 11) The method of claim 11, wherein the water is disposed in a tank. ### Claim 15 (depends on 14) The method of claim 14, wherein the sodium nitrite is added to the tank ### Claim 16 (depends on 11) The method of claim 11, wherein the reaction between the sodium nitrite and the hydrogen sulfide is carried out at between about 40° C. to about 70° C. ### Claim 17 (depends on 11) The method of claim 11, wherein an ammonia-removal gas. ### Claim 18 (depends on 11) The method of claim 11, wherein the gas is blown by a compressor. ### Claim 19 (depends on 11) The method of claim 11, wherein the gas comprises nitrogen. ### Claim 20 (depends on 11) The method of claim 11, wherein the gas comprises air.