# US 12,006,483 B2 · Phosphorous-free oil soluble molybdenum complexes for high temperature naphthenic acid corrosion inhibition > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,006,483 B2 - Document ID: US12006483B2 - Status: Granted - Kind: B2 - Application number: 17/443,591 - Filed: 2021-07-27 - Published: 2022-02-03 - Granted: 2024-06-11 - Earliest claimed: 2020-07-29 - Assignees: Ecolab USA Inc. - Applicants: Ecolab USA Inc. - Inventors: Oussama Zenasni; Philip Andrew Thornthwaite; Maria DeJesus Marquez; John Nathan Scholz - Web page: https://patentgrep.com/patent/US12006483B2 ## CPC - C10G 75/02: by addition of corrosion inhibitors - C09K 8/54: Compositions for in situ inhibition of corrosion in boreholes or wells - C10G 7/10: Inhibiting corrosion during distillation - C23F 11/04: in markedly acid liquids - C23F 11/16: Sulfur-containing compounds - C09K 2208/32: Anticorrosion additives - C10G: CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION (cracking to hydrogen or synthesis gas C01B; cracking or pyrolysis of hydrocarbon gases to individual hydrocarbons or mixtures thereof of definite or specified constitution C07C; cracking to cokes C10B); RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - C23F: NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE (working metal by laser beams B23K26/00; desurfacing by applying flames B23K7/00; working of metal by electro-erosion B23H; producing decorative effects by removing surface material, e.g. by engraving, by etching, B44C1/22; electrolytic etching or polishing C25F); INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25 ## Abstract Disclosed are sulfur-containing molybdenum complexes used in compositions and methods for inhibiting or reducing high temperature corrosion in petroleum refineries. ## Claims ### Claim 1 A method of inhibiting corrosion of a metal surface that is contacted by a hydrocarbon fluid source containing acidic corrodents, comprising: introducing into the hydrocarbon fluid source containing acidic corrodents a phosphorus-free, sulfur-containing molybdenum complex having the general formula selected from Formula II: wherein R and R′ each represents a group selected from an alkyl group comprising one or more hydroxyl groups, an alkyl group, an alkenyl group, or an aryl group; and each X represents oxygen or sulfur and can be the same or different but where at least one X in Formula II is sulfur. ### Claim 2 (depends on 1) The method of claim 1, wherein the hydrocarbon fluid source is in contact with a distillation column, a stripper, a tray, or piping. ### Claim 3 (depends on 1) The method of claim 1, wherein the hydrocarbon fluid source comprises a liquid hydrocarbon fraction. ### Claim 4 (depends on 1) The method of claim 1, wherein the hydrocarbon fluid source comprises crude oil. ### Claim 5 (depends on 1) The method of claim 1, wherein the hydrocarbon fluid source comprises a total acid number (TAN) of 0.2 to 20 or the hydrocarbon fluid source has a temperature that is about 175° C. to 600° C. ### Claim 6 (depends on 1) The method of claim 1, wherein the acidic corrodents comprise a corrodent selected from the group consisting of naphthenic acid, sulfur or combinations thereof. ### Claim 7 (depends on 1) The method of claim 1, wherein the acidic corrodents comprise a naphthenic acid. ### Claim 8 (depends on 1) The method of claim 1, wherein R or R′ is an alkyl group comprising one or more hydroxyl groups. ### Claim 9 (depends on 1) The method of claim 1, wherein R or R′ is an alkyl group. ### Claim 10 (depends on 1) The method of claim 1, wherein R or R′ is an alkenyl group. ### Claim 11 (depends on 1) The method of claim 1, wherein R or R′ is an aryl group. ### Claim 12 (depends on 11) The method of claim 11, wherein the aryl group is substituted. ### Claim 13 (depends on 9) The method of claim 9, wherein the alkyl group is 2 to 30 carbon atoms. ### Claim 14 (depends on 9) The method of claim 9, wherein the alkyl group is 5 to 10 carbon atoms. ### Claim 15 (depends on 1) The method of claim 1, wherein the phosphorus-free, sulfur-containing molybdenum complex is introduced into a distillation column. ### Claim 16 (depends on 1) The method of claim 1, wherein the introducing step comprises introducing a composition into the hydrocarbon fluid source, wherein the composition comprises the phosphorus-free, sulfur-containing molybdenum complex and one or more other additives. ### Claim 17 (depends on 16) The method of claim 16, wherein the one or more other additives comprise an asphaltene inhibitor. ### Claim 18 (depends on 16) The method of claim 16, wherein the one or more other additives comprise a paraffin inhibitor. ### Claim 19 (depends on 16) The method of claim 16, wherein the one or more other additives comprise a dispersant.