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| Number | Title | Issue Date |
| 7704380 | Method of removing sulfides including hydrogen sulfide and mercaptan In accordance with the present invention, a method of removing sulfide(s), which is safe, is effective over long periods at low cost, and exerts no adverse influences on the environment. The present invention relates to a method of removing sulfide(s), characterized... | 04/27/2010 |
| 7374734 | Absorbing agent and method for eliminating acid gases from fluids The disclosure relates to an absorbent for removing acid gases from fluids. The absorbent contains at least one tertiary amine, an amine which is selected from hydroxyethylpiperazine, bis(hydroxyethylpiperazine) or a mixture of these and piperazine. The absorbent ma... | 05/20/2008 |
| 7368617 | Selective hydrogenation of acetylenes and dienes in a hydrocarbon stream Acetylenes and dienes in a stream containing hydrogen, methane, C2-C6 olefins and paraffins, C2-C6 acetylenes and dienes, benzene, toluene, xylenes, and other C6+ components are hydrogenated in a downflow boilin... | 05/06/2008 |
| 7276152 | Oxidative desulfurization and denitrogenation of petroleum oils A robust, non-aqueous, and oil-soluble organic peroxide oxidant is employed for oxidative desulfurization and denitrogenation of hydrocarbon feedstocks including petroleum fuels. Even at low concentrations, the non-aqueous organic peroxide oxidant is extremely activ... | 10/02/2007 |
| 7270737 | Process for desulfurization comprising a stage for selective hydrogenation of diolefins and a stage for extraction of sulfur-containing compounds For desulfurization of a hydrocarbon-containing feedstock, at least one stage for selective hydrogenation of diolefins present in the initial hydrocarbon feedstock, in the presence of a catalyst of group VIII of the period table, and a stage for extraction by a solv... | 09/18/2007 |
| 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 |
| 7211665 | Sulfide scavenger 1,3,5-(2H2,4H2,6H2) tripropanediamine N,N,N′,N′,N″,N″ hexamethyl is used to scavenge sulfur compounds from hydrocarbons. A novel method of making the triazine comprises autocondensing (CH3)2NCH2 | 05/01/2007 |
| 7189282 | Method for eliminating mercaptan from crude gas This invention relates to a process for cleaning gas, in particular hydrocarbonaceous gas such as e.g. natural gas, which is contaminated with sulfur in the form of H2S and mercaptans as well as CO2. To remove the undesired sulfur-contai... | 03/13/2007 |
| 7175755 | Process for the extractive oxidation of contaminants from raw hydrocarbon streams A process for the extractive oxidation of contaminants from raw hydrocarbon streams rich in heteroatomic polar compounds is described, the said process involving the extractive oxidation of sulfur and nitrogen compounds from said streams, the said process comprising... | 02/13/2007 |
| 7087156 | Process for removal of nitrogen containing contaminants from gas oil feedstreams The present invention is directed to the removal of nitrogen and sulfur containing impurities from high molecular weight petroleum feedstock obtained from fluid cracking catalyst or distillation zone of a petroleum treatment plant. The present process comprises firs... | 08/08/2006 |
| 7048846 | Membrane separation for sulfur reduction A membrane process for the removal of sulfur species from a naphtha feed, in particular, a FCC light cat naphtha, without a substantial loss of olefin yield is disclosed. The process involves contacting a naphtha feed stream with a membrane having sufficient flux an... | 05/23/2006 |
| 7041212 | Membrane separation for sulfur reduction A membrane process for the removal of sulfur species from a naphtha feed, in particular, a FCC light cat naphtha, without a substantial loss of olefin yield is disclosed. The process involves contacting a naphtha feed stream with a membrane having sufficient flux an... | 05/09/2006 |
| 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 |
| 7018527 | Membrane separation for sulfur reduction A membrane process for the removal of sulfur species from a naphtha feed, in particular, a FCC light cat naphtha, without a substantial loss of olefin yield is disclosed. The process involves contacting a naphtha feed stream with a membrane having sufficient flux an... | 03/28/2006 |
| 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 |
| 7004997 | Method for removal of acid gases from a gas flow A process is described for removing acid gases from a gas stream in which an acid-gas-containing gas stream in which the sum of the partial pressures of the acid gases does not exceed 1,500 mbar is brought into contact with an aqueous absorbent in an absorption step... | 02/28/2006 |
| 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 |
| 7001504 | Method for extraction of organosulfur compounds from hydrocarbons using ionic liquids A process for the removal of organosulfur compounds from hydrocarbon materials is disclosed. The process includes contacting an ionic liquid with a hydrocarbon material to extract sulfur-containing compounds into the ionic liquid. The sulfur-containing compounds can... | 02/21/2006 |
| 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 |
| 6939393 | Method for neutralizing a stream of fluid, and washing liquid for use in one such method A description is given of the use of an alkylenediamine of the type R1HN—X—NHR2, where X is an alkylene radical having from 2 to 9 carbons, R1 is a hydrocarbon radical having from 1 to 6 carbons and R2 is a hydrocarbon... | 09/06/2005 |
| 6923904 | Process for effecting ultra-deep HDS of hydrocarbon feedstocks The invention pertains to a process for reducing the sulfur content of a hydrocarbon feedstock to a value of less than 200 ppm, preferably less than 50 ppm, which comprises subjecting a catalyst comprising a Group VIB metal component, a Group VIII metal component, a... | 08/02/2005 |
| 6827844 | Ultrasound-assisted desulfurization of fossil fuels in the presence of dialkyl ethers Fossil fuels are combined with an aqueous liquid and a dialkyl ether to form an aqueous-organic reaction medium which is passed through an ultrasound chamber on a continuous flow-through basis. The emerging mixture separates spontaneously into aqueous and organic ph... | 12/07/2004 |
| 6802959 | Separation of olefinic hydrocarbons from sulfur-containing hydrocarbons by use of a solvent A process for separating olefins from sulfur-containing hydrocarbons contained in a hydrocarbon feedstock is disclosed and includes contacting the hydrocarbon feedstock with N-hydroxyethyl pyrollidone in a contacting zone, removing at least one olefin overhead from ... | 10/12/2004 |
| 6740230 | Method for removing mercaptans from fluid fluxes The disclosure concerns a process for removing mercaptans from fluid streams comprising same, especially from hydrocarbon gas streams, for example natural gas, synthesis gas from heavy oil or heavy residues or refinery gas, or else from liquid hydrocarbons, for exam... | 05/25/2004 |
| 6736963 | Multiple stage process for removal of sulfur from components for blending of transportation fuels Economical processes are disclosed for the production of fuels of reduced sulfur content from a feedstock, typically derived from natural petroleum, wherein the feedstock is comprised of limited amounts of sulfur-containing organic compounds as unwanted impurities. ... | 05/18/2004 |
| 6733660 | Multistage process for removal of sulfur from components for blending of transportation fuels Economical processes are disclosed for the production of fuels of reduced sulfur content from a feedstock, typically derived from natural petroleum, wherein the feedstock is comprised of limited amounts of sulfur-containing organic compounds as unwanted impurities. ... | 05/11/2004 |
| 6726835 | Fractionation for full boiling range gasoline desulfurization Savings in the processing of a naphtha boiling range feed containing a thiophene are achieved by fractionating the feed stream in a single dividing wall column to yield a C6-minus overhead stream, a side-draw containing the majority of the C6 a... | 04/27/2004 |
| 6638419 | Method for obtaining oil products with low sulphur content by desulfurization of extracts A method for obtaining oil products such as diesel fuel with improved quality, from a gas oil fraction containing organosulphur compounds such as dibenzenethiophenes and/or their derivatives, with initial and final boiling points generally ranging between... | 10/28/2003 |
| 6540907 | Fractionation for full boiling range gasoline desulfurization Savings in the processing of a naphtha boiling range feed containing a thiophene are achieved by fractionating the feed stream in a single dividing wall column to yield a C6 -minus overhead stream, a side-draw containing the majority of the C | 04/01/2003 |
| 6531103 | Process for removing sulfur compounds from gas and liquid hydrocarbon streams The present invention provides a process for removing sulfur compounds including sulfur in the (-2) oxidation state such as mercaptans, dialkyl sulfides, carbonyl sulfide, hydrogen sulfide, thiophenes and benzothiophenes, from liquid or gas feed streams, ... | 03/11/2003 |
| 6488840 | Mercaptan removal from petroleum streams (Law950) This invention relates to reducing the amount of thiols (mercaptans) in petroleum streams, specifically, mercaptans above the five carbon molecular weight range.... | 12/03/2002 |
| 6483003 | Removal of impurities from a hydrocarbon component or fraction A process for removing impurities from a hydrocarbon component or fraction comprises mixing, in a liquid-liquid extraction step, an impurity-containing liquid hydrocarbon component or fraction, as an impure liquid hydrocarbon feedstock, with an acetonitri... | 11/19/2002 |
| 6444117 | Sweetening of sour crudes The general object of this invention is to provide an improved process for sweetening and desulfurizing sulfur-containing crude oil streams. Heating the sulfur-containing crude oil stream to an elevated temperature for an extended period of time while sti... | 09/03/2002 |
| 6406616 | Process for removing low amounts of organic sulfur from hydrocarbon fuels A process for desulfurizing hydrocarbons such as gasoline and similar petroleum products to reduce the sulfur content to a range of from about 2 to 15 ppm sulfur without affecting the octane rating is described. The sulfur containing hydrocarbon is contac... | 06/18/2002 |
| 6402940 | Process for removing low amounts of organic sulfur from hydrocarbon fuels A process for desulfurizing fuels such as diesel oil and similar petroleum products to reduce the sulfur content to a range of from about 2 to 15 ppm sulfur is described. The sulfur containing fuel is contacted at slightly elevated temperatures with an ox... | 06/11/2002 |
| 6358402 | Extractive distillation process for the reduction of sulfur species in hydrocarbons streams A method for separating sulfur species from hydrocarbon streams, particularly cracked naphtha streams, using extractive distillation. The method effectively separates sulfur species from cracked naphtha streams without substantially lowering the olefin co... | 03/19/2002 |
| 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 |
| 6267938 | Scavengers for use in reducing sulfide impurities A method is provided for reducing the amount of hydrogen sulfide and organic sulfides present in streams, such as natural gas streams, by scrubbing the stream with a composition containing (i) an aqueous phase containing a reaction product resulting from ... | 07/31/2001 |
| 6242618 | H2S scavengers for polysulfide products and methods for scavenging H2S from polysulfide products Invention relates to H2 S scavengers polysulfide compounds and methods for scavenging H2 S from polysulfide compounds. Furthermore, the invention uses a scavenger for selectively reducing the levels of hydrogen sulfide present in a p... | 06/05/2001 |
| 6231755 | Desulfurization of petroleum products The invention discloses a process for the desulfurization of petroleum products by contacting with acidic organic polymers. Preferably, highly fluorinated and, most preferably, perfluorinated acidic organic polymers are used.... | 05/15/2001 |
