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| Number | Title | Issue Date |
| 7244352 | Selective hydroprocessing and mercaptan removal A process for producing a naphtha having a decreased amount of sulfur by selective hydroprocessing a petroleum feedstream comprising cracked naphtha to reduce its sulfur content with minimum loss of octane. The reduced sulfur naphtha stream contains mercaptan sulfur... | 07/17/2007 |
| 7223332 | Reactor and process for mercaptan oxidation and separation in the same vessel The present invention is an apparatus and process for oxidizing mercaptans in a preferably kerosene stream. By using a catalyst promoter, sufficient separation of hydrocarbon and aqueous alkali occurs in the reactor vessel to obviate the need for a settling tank. He... | 05/29/2007 |
| 7179368 | Method for desulfurizing thiophene derivatives contained in fuels The invention concerns a method for selectively desulphurizing thiopene compounds contained in hydrocarbons derived from crude oil distillation, whether refined or not, which consists in oxidising the thiophene sulphur atoms into sulphone in the presence of an oxidi... | 02/20/2007 |
| 7029573 | Composition and control method for treating hydrocarbon The invention relates to a composition and method for treating liquid hydrocarbons in order to remove acidic impurities, such as mercaptans, particularly mercaptans having a molecular weight of about C4 (C4H10S=90 g/mole) and higher,... | 04/18/2006 |
| 7014751 | Continuous liquid hydrocarbon treatment method The invention relates to a method for treating and upgrading a hydrocarbon containing acidic species such as mercaptans, comprising: (a) contacting the hydrocarbon, in the essential absence of oxygen, with a first phase of a treatment composition containing w... | 03/21/2006 |
| 7005058 | Process and apparatus for removing sulfur from hydrocarbons Disclosed is an apparatus and process for controlling the sulfur content of effluent from a hydrocarbon fractionation column. The effluent includes a low boiling stream, a middle boiling stream and a high boiling stream. Either of the feed or the low boiling stream ... | 02/28/2006 |
| 6960291 | Naphtha desulfurization method The invention relates to a method for desulfurizing naphtha boiling-range hydrocarbons such as cracked naphtha. More particularly, the invention relates to hydrotreating the naphtha under selective hydrotreating conditions, and then removing mercaptans from the hydr... | 11/01/2005 |
| 6755964 | Process for the fixed bed sweetening of petroleum distillates using halogenated metal phthalocyanine as a catalyst A process for fixed bed sweetening of petroleum distillates using halogenating metal phthalocyanine as a catalyst comprising impregnating the catalyst on activated charcoal bed by circulating alcoholic alkaline solution of the catalyst through charcoal bed till colo... | 06/29/2004 |
| 6656977 | Alkyl glycidyl ether-capped polyamine foam control agents A method for controlling the foaming of an aqueous organic compound-containing composition by the incorporation of a foam controlling amount of a compound of the formula: ##STR1## where n and m are 2 or 3, x is 1-6, ##STR2## R' is a C4 to C22 alky... | 12/02/2003 |
| 6565740 | Process for sweetening of LPG, light petroleum distillates by liquid-liquid extraction using metal phthalocyanine sulphonamide catalyst The present invention related to a process for sweetening of LPG light petroleum distillates by liquid liquid extraction using metal phtalocyanine sulphonamide catalyst which comprises extracting the mercaptanes contain in LPG, light petroleum distillate ... | 05/20/2003 |
| 6352640 | Caustic extraction of mercaptans (LAW966) The invention describes a method for preparing a low sulfur motor gasoline utilizing ethanol and caustic extraction.... | 03/05/2002 |
| 6013175 | Quaternary ammonium hydroxides as mercaptan scavengers A method for scavenging mercaptans in a hydrocarbon fluid is disclosed. According to the method, an effective mercaptan-scavenging amount of an aqueous scavenging composition is added to the fluid. The composition comprises a quaternary ammonium hydroxide... | 01/11/2000 |
| 5961819 | Treatment of sour hydrocarbon distillate with continuous recausticization An improved process is described for removing mercaptan sulfur from sour hydrocarbon distillate streams comprising of treating a sour hydrocarbon distillate stream in two oxidation zones within a reaction vessel. The first treatment occurs in the presence... | 10/05/1999 |
| 5840177 | Quaternary ammonium hydroxides as mercaptan scavengers A method for scavenging mercaptans in a hydrocarbon fluid is disclosed. According to the method, an effective mercaptan-scavenging amount of an aqueous scavenging composition is added to the fluid. The composition comprises a quaternary ammonium hydroxide... | 11/24/1998 |
| 5741415 | Method for the demercaptanization of petroleum distillates The demercaptanization of petroleum distillates may be carried out by means of the oxidation of the mercaptans contained therein using the oxygen in the air, at a temperature of about 80° to about 220° C., in the presence of about 0.01 to about 10.0 mas... | 04/21/1998 |
| 5683574 | Method for the extraction of low molecular weight mercaptans from petroleum and gas condensates Low molecular weight mercaptans are extracted from petroleum (e.g., crude oil) or gas condensate by contacting the mercaptans with oxygen in an aqueous solution of a metal hydroxide in the presence of a cobalt dihalodihydroxydisulfophthalocyanine catalyst... | 11/04/1997 |
| 5591323 | Process for sweetening petroleum cuts without regular addition of alkaline solution using a basic solid catalyst A process for sweetening a petroleum cut containing mercaptans, wherein said petroleum cut is subjected to oxidation conditions by being contacted with a porous catalyst, in the presence of air said process being characterised in that said catalyst compri... | 01/07/1997 |
| 5340465 | Use of a metal oxide solid solution for sweetening a sour hydrocarbon fraction An improved process for treating a sour hydrocarbon stream has been developed. This process involves contacting the sour hydrocarbon fraction with a metal oxide solid solution in the presence of an oxidizing agent such as air or oxygen. One example of a s... | 08/23/1994 |
| 5273646 | Process for improving the activity of a mercaptan oxidation catalyst This invention relates to a process for improving the activity of a catalyst effective in sweetening a hydrocarbon fraction containing mercaptans. The process involves adding to the hydrocarbon fraction an effective amount of an aqueous solution comprisin... | 12/28/1993 |
| 5244643 | Treatment of oxygen containing gaseous hydrocarbons for mercaptan removal Fuel gas streams containing oxygen are treated by a process that performs simultaneous sweetening and absorption of mercaptan compounds. The mercaptan oxidation catalyst and an aqueous alkaline solution and a low vapor pressure liquid hydrocarbon stream c... | 09/14/1993 |
| 5180484 | Caustic free liquid/liquid process for sweeting a sour hydrocarbon fraction This invention relates to a liquid-liquid process for treating a sour hydrocarbon fraction. The process comprises contacting the hydrocarbon fraction in the presence of an oxidizing agent with an aqueous solution containing ammonium hydroxide, a metal che... | 01/19/1993 |
| 5169516 | Removal of arsenic compounds from light hydrocarbon streams A process for removal of arsenic from a hydrocarbon stream containing arsenic together with mercaptan and non-mercaptan sulfur compounds. The hydrocarbon stream is passed through at least two mercaptan oxidizing reactors in series wherein the mercaptans a... | 12/08/1992 |
| 4968411 | Method of treating a hydrocarbon chargestock A catalyst composition useful in the catalytic oxidation of mercaptans is disclosed. The composition is a stable aqueous slurry or suspension of a first component which is predominantly a metal phthalocyanine disulfonate compound, and a second component w... | 11/06/1990 |
| 4956325 | Method of impregnating a support material The present invention is directed to impregnating a support material with a metal phthalocyanine oxidation catalyst dissolved in monoethanol amine. More specifically, the invention is directed to the method of impregnating a catalyst support such as carbo... | 09/11/1990 |
| 4929340 | Catalyst and process for sweetening a sour hydrocarbon fraction using dipolar compounds This invention relates to an improved process and catalyst for treating a sour hydrocarbon stream. The improvement comprises the use of a dipolar compound which has a positively charged atom and an electronegative group in the same structure. A particular... | 05/29/1990 |
| 4913802 | Process for sweetening a sour hydrocarbon fraction This invention relates to a process for sweetening a sour hydrocarbon fraction containing mercaptans. The process involves contacting the hydrocarbon fraction in the presence of an oxidizing agent with a catalytic composite, ammonium hydroxide and a quate... | 04/03/1990 |
| 4909925 | Removal of hydrogen sulphides Hydrogen sulphide is scavenged from a feedstock comprising crude oil and hydrogen sulphide by adding a compound of general formula ##STR1## to the feedstock. R is an alkyl group containing 1 to 18 carbon atoms, an aryl group, or an alkyl aryl group w... | 03/20/1990 |
| 4908122 | Process for sweetening a sour hydrocarbon fraction The present invention deals with a process for sweetening a sour hydrocarbon fraction containing mercaptans. The process involves contacting the hydrocarbon fraction in the presence of an oxidizing agent with a catalytic composite, ammonium hydroxide and ... | 03/13/1990 |
| 4906354 | Process for improving the thermal stability of jet fuels sweetened by oxidation The thermal stability of jet fuel sweetened by oxidation is improved by washing the sweetened fuel with strong aqueous caustic.... | 03/06/1990 |
| 4897180 | Catalytic composite and process for mercaptan sweetening This invention relates to a catalytic composite effective in oxidizing mercaptans contained in a sour petroleum distillate to disulfides. The catalytic composite comprises a metal chelate, an onium compound and optionally an alkali metal hydroxide. The on... | 01/30/1990 |
| 4808765 | Sulfur removal from hydrocarbons There is disclosed a process for treating liquid (liquifiable) and gaseous hydrocarbons to remove substantially all of the acid gases including COS by contacting the hydrocarbon streams with specific aqueous treating agents in a series of sequential speci... | 02/28/1989 |
| 4705620 | Mercaptan extraction process A process is disclosed for treating a sour hydrocarbon stream comprising extracting the mercaptans contained in said hydrocarbon stream with an alkaline solution in an extraction zone, oxidizing the mercaptans to disulfides in the presence of an oxidation... | 11/10/1987 |
| 4490246 | Process for sweetening petroleum fractions A process is disclosed for treating hydrocarbon streams by the catalyzed oxidation of mercaptans to disulfides. In the process, the hydrocarbon-containing stream is admixed with air and then passed through an oxidation zone. The oxidation zone effluent is... | 12/25/1984 |
| 4481107 | Oxidation of difficultly oxidizable mercaptans A process is disclosed for oxidizing difficultly oxidizable mercaptans contained in a hydrocarbon fraction which comprises adding a hydrocarbon soluble alkali metal compound, capable of forming the alkali metal mercaptides of the difficultly oxidized merc... | 11/06/1984 |
| 4481106 | Hydrocarbon treating process A process is disclosed for treating hydrocarbon streams such as naphtha by the oxidation of mercaptans into disulfide compounds which remain in the hydrocarbon stream. The conversion is effected during passage of the hydrocarbon and an aqueous stream down... | 11/06/1984 |
| 4412912 | Hydrocarbon treating process having minimum gaseous effluent A process is disclosed for treating hydrocarbon streams for the purpose of removing mercaptans and also converting the remaining mercaptans to disulfides which remain in the hydrocarbon stream being treated. The hydrocarbons rise through a contacting colu... | 11/01/1983 |
| 4411776 | Method for treating mercaptans contained in a sour petroleum distillate A method of treating a mercaptan-containing sour petroleum distillate is disclosed which method comprises the steps of contacting the distillate at oxidation conditions with a catalytic composite comprising a metal chelate, at least about 10 wt. % of an a... | 10/25/1983 |
| 4378305 | Catalytic composite particularly useful for the oxidation of mercaptans and the removal of gums contained in a sour petroleum distillate A catalytic composite comprising a metal chelate mercaptan oxidation catalyst impregnated on a basic anion exchange resin is disclosed. The catalytic composite is particularly useful to effect the oxidation of mercaptans contained in a sour petroleum dist... | 03/29/1983 |
| 4374042 | Method of reactivating a catalytic composite of a carrier material and a mercaptan oxidation catalyst A method of reactivating a mercaptan oxidation catalytic composite of an adsorptive support and a metal chelate comprising contacting the composite with an aqueous solution of a quaternary ammonium compound and a linear ionic compound at a temperature of ... | 02/15/1983 |
| 4364843 | Catalytic composite, method of manufacture, and process for use A catalytic composite comprising a metal chelate, at least about 10 wt. % of an alkali metal hydroxide, and an adsorptive support, prepared by admixing the support, metal chelate, alkali metal hydroxide, and an alcohol having fewer than about five carbon ... | 12/21/1982 |
