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| Number | Title | Issue Date |
| 7432411 | Continuous method for obtaining butenes from a Cfraction A continuous process for isolating butenes from a C4 fraction comprising butanes, butenes and other C3-C5-hydrocarbons by extractive distillation using a selective solvent (LM), comprising a first process stage I in a scrubbing zone ... | 10/07/2008 |
| 7396450 | Method of reducing amount of peroxides, reducing fuel sediments and enhancing fuel system elastomer durability, fuel stability and fuel color durability A reduction in the formation and presence of peroxides in low sulfur diesel fuels is obtained through the combination of those fuels with an organic nitrate combustion improver. The reduction in the amount of peroxides means that the fuel system elastomers will be m... | 07/08/2008 |
| 7355087 | Production of 1-alkenes from mixed olefin streams using catalytic distillation A catalytic distillation process for isomerizing and separating 1-alkenes from a mixed alkene stream. The process comprises contacting a mixed alkene stream comprising the 1-alkene and homologs thereof with a supported isomerization catalyst under isomerization/dist... | 04/08/2008 |
| 7348466 | Solvent extraction In a method for the solvent extraction of butadiene from a mixture of hydrocarbons having four carbon atoms per molecule, which method inherently produces tars, the extraction process is operated with a tar loading level, relative to the solvent employed, of no more... | 03/25/2008 |
| 7342143 | Polyalphaolefin having a low halide concentration and a method of manufacturing thereof A method for the processing of a polyalphaolefin feedstock having a concentration of organic halide to thereby yield a polyalphaolefin end-product having a low concentration of organic halide. The method includes a hydrogenation step whereby the polyalphaolefin feed... | 03/11/2008 |
| 7304200 | Method for separation of substances by extraction or by washing them with ionic liquids The present invention relates to a process for the liquid-liquid extraction or liquid-gas extraction of mixtures of organic compounds, in which one or more components of the mixture are completely or partly extracted by means of a phase comprising at least one ionic... | 12/04/2007 |
| 7205438 | Solvent recovery blends from diene production A diene production stream comprising a solvent recovery blend from diene production comprising one or more fouling agent, one or more extractive distillation solvent, and from about 1 ppm to about 1000 ppm of N,N-disubstituted amide. ... | 04/17/2007 |
| 7204927 | Settling aids for solids in hydrocarbons A treatment for accelerating the settling of finely divided solids in hydrocarbon fluids, including adding to the hydrocarbon a sufficient settling amount of a combination of at least two of (a) a quaternary fatty ammonium compound, (b) a hetero-atom punctuated fatt... | 04/17/2007 |
| 7202391 | Process for inhibiting polymerization of an aromatic vinyl compound According to the present invention, there is provided a process for inhibiting the polymerization of an aromatic vinyl compound which is capable of efficiently inhibiting the polymerization of an aromatic vinyl compound not only in an initial stage but also over a l... | 04/10/2007 |
| 7182839 | Preventing deposition of fouling agents onto equipment Methods and compositions effective to prevent deposition of fouling agents, preferably polymerization precursors, on handling equipment, particularly during solvent recovery. ... | 02/27/2007 |
| 7078580 | Process for separating aromatics by extractive distillation and a composite solvent used therein This application relates to a composite solvent for separating aromatics by extractive distillation, comprising a main solvent, a solutizer and a modifier. Said solutizer is selected from any one or mixtures of any two of C8–C11 aromatics hav... | 07/18/2006 |
| 7048847 | Settling aids for solids in hydrocarbons A treatment for accelerating the settling of finely divided solids in hydrocarbon fluids, including adding to the hydrocarbon a sufficient settling amount of a combination of (a) a polyacrylic acid adducted alkylphenol-formaldehyde resin alkoxylate compound, and (b)... | 05/23/2006 |
| 7019188 | Use of ionic liquids to separate olefins, diolefins and aromatics The present invention relates to the separation of olefins, diolefins and lower aromatics from mixed streams of hydrocarbons using ionic liquids in the absence of metal compounds. The present invention eliminates the metal complexes conventionally used in such separ... | 03/28/2006 |
| 6866772 | Extraction of aromatics from hydrocarbon oil using furfural-co-solvent extraction process An improved furfural extraction process for lube oil base-stock production from hydrocarbon oils containing aromatic type material by the addition of a solvent comprising of furfural and a co-solvent, said process being conducted in a continuous countercurrent extra... | 03/15/2005 |
| 6689926 | Process for purifying styrene monomer feedstock prior to polymerization A process is disclosed which provides for the reduction of phenylacetylene levels in styrene monomer feedstreams, which process utilizes a normal styrene inhibitor additive, such as an hydroxylamine, injected into the styrene monomer feedstream immediatel... | 02/10/2004 |
| 6617483 | Polyalkylene glycol compositions for enhanced aromatic extraction The invention relates to extractive distillation compositions for separating a mixture of hydrocarbon compounds, wherein the extractive distillation composition includes at least one alkylene glycol compound, and at least one compatibility agent, wherein ... | 09/09/2003 |
| 6555726 | Methods for enhanced extractive distillation employing extractive distillation compositions comprising sulfolane and compatibility agent The invention relates to methods for enhanced extractive distillation of hydrocarbons that employ extrative distillation compositions comprising sulfolane or sulfolane derivatives in comination with compatibility agents.... | 04/29/2003 |
| 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 |
| 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 |
| 6475348 | Mixture of substances containing compounds with vinyl groups and stabilizers A mixture contains one or more vinyl-containing compounds as component (A) and, as a further component, a stabilizer (B) which contains one or more readily volatile nitroxyl compounds as component (b1), one or more sparingly volatile nitroxyl c... | 11/05/2002 |
| 6441264 | Method for separating benzothiophene compounds from hydrocarbon mixture containing them, and hydrocarbon mixture obtained by said method A method for separating at least a benzothiophene compound from a hydrocarbon mixture is disclosed. The method includes contacting the mixture of a fraction obtained therefrom with a reagent including an acceptor complexing agent π, to obtain a donor-acc... | 08/27/2002 |
| 6407306 | Process for extracting carotenes from carotene-containing materials A process is described for extracting carotenes from carotene-containing materials, in particular from fats and oils of biological origin, which provides for extraction of carotene-containing material with an extractant comprising at least one member sele... | 06/18/2002 |
| 6395953 | Process for preparing purified conjugated diene Processes for producing a purified conjugated diene comprise feeding a petroleum fraction containing the conjugated diene to an extractive distillation column, feeding an extraction solvent to the extractive distillation column, and extractive-distilling ... | 05/28/2002 |
| 6392115 | Separation of hydrocarbons by extractive distillation A process for separating a first hydrocarbon, selected from the group consisting of aromatic hydrocarbons, cycloalkanes, cycloalkenes, cycloalkadienes and combinations thereof, from a close-boiling second hydrocarbon, selected from the group consisting of... | 05/21/2002 |
| 6342648 | Methods and compositions for inhibiting vinyl aromatic monomer polymerization The present invention provides compositions and methods inhibiting polymerization of vinyl aromatic compounds comprising a bisphenol compound and an oxidized p-phenylenediamine. In a specific, non-limiting embodiment, the polymerization of the vinyl aroma... | 01/29/2002 |
| 6337429 | Method for separating a C4-hydrocarbon mixture A C4 -hydrocarbon mixture essentially containing 1,3-butadiene, butenes, butanes and other C4 -hydrocarbons is separated into at least 4 fractions, a) the fraction (a) essentially comprising 1,3-butadiene, b) the fraction (b) essentially ... | 01/08/2002 |
| 6320090 | Method of removing contaminants from petroleum distillates Polynuclear aromatic hydrocarbons (PAHs) and other contaminants are removed from petroleum distillates by mixing a solvent with petroleum distillate to extract the contaminants therefrom. The solvent is recovered and distilled to separate the contaminants... | 11/20/2001 |
| 6147273 | Method for the separation of compounds having olefinic unsaturation Olefins may be separated from paraffins, particularly those having the same number of carbon atoms, more easily than by fractional distillation by contacting a feed containing both materials with an aqueous solution of silver nitrate and nitric acid. The ... | 11/14/2000 |
| 6136155 | Separation of mesitylene from 1,2,4-trimetyhlbenzene by azeotropic distillation Mesitylene is difficult to separate from 1,2,4-Trimethylbenzene because of the proximity of their boiling points. They are readily separated by azeotropic distillation. Effective agents are isopropyl acetate, 2-pentanol and acetonitrile.... | 10/24/2000 |
| 6117310 | Process for treating a hydrocarbon substrate with a bisoxazolidine hydrogen sulfide scavenger The present invention provides a method for scavenging sulfhydryl compounds from sour hydrocarbon substrates, preferably crude oils, refined distillate streams, and natural gas, by mixing the substrates with preferably substantially water free bisoxazolid... | 09/12/2000 |
| 6114593 | Method for reducing organic fluoride levels in hydrocarbons A system and/or process for decreasing the level of at least one organic fluoride present in a hydrocarbon mixture by first passing the hydrocarbon mixture to an eductor and educting into the hydrocarbon mixture a catalyst comprising a volatility reducing... | 09/05/2000 |
| 6100439 | Styrene caustic wash extraction aid Methods and compositions for improving the extraction of phenols from crude styrene using an aqueous caustic solution are disclosed. It has been discovered that aromatic or alkylammonium tailed multi-polyether headed surfactants and/or quaternary polyamin... | 08/08/2000 |
| 6040489 | 1,3-Butadiene separation from a crude C4 stream using catalytic extractive distillation A process for separating 1,3-butadiene from a crude C4 stream containing butanes, butenes, butadienes and acetylenes has been developed. The process begins with introducing hydrogen, a solvent, and the crude C4 stream to a catalytic ... | 03/21/2000 |
| 6033529 | Separation of mesitylene from 4-ethyl toluene by azeotropic distillation Mesitylene cannot be separated from 4-ethyl toluene by distillation because of the proximity of their boiling points. They are readily separated by azeotropic distillation. Effective agents are isopropyl palmitate, triacetin and methyl salicylate.... | 03/07/2000 |
| 6005157 | Cycloparaffin purification from petroleum streams Disclosed is a process for separating at least one cycloalkane containing 5-10 carbon atoms per molecule from at least one close-boiling alkane by extractive distillation of a feed consisting essentially of said at least one cycloalkane and said at least ... | 12/21/1999 |
| 5972172 | Separation of 1,2,4-trimethylbenzene from 1,2,3-trimethylbenzene by extractive distillation 1,2,4-Trimethylbenzene is difficult to separate from 1,2,3-trimethylbenzene by conventional distillation or rectification because of the proximity of their boiling points. 1,2,4-trimethylbenzene can be readily separated from 1,2,3-trimethylbenzene by extr... | 10/26/1999 |
| 5958352 | Abatement of hydrogen sulfide with an aldehyde ammonia trimer The present invention provides a method for scavenging H2 S from aqueous and hydrocarbon substrates, preferably natural gas, using aldehyde ammonia trimers.... | 09/28/1999 |
| 5951916 | Solutions of buckminsterfullerene (C60 ) in n-ethyl-2-pyrrolidone (NEP) A solution comprising a polar solvent and C60 in which the solubility of C60 is at least 2 mg/ml of solvent. The polar solvent has a low toxicity, high boiling point, high thermal and electrochemical stability, low viscosity, low fre... | 09/14/1999 |
| 5888356 | Inhibition of polymerization of vinylaromatic or vinylaliphatic The polymerization of a vinylaromatic or vinylaliphatic compound at elevated temperature in the absence of air is inhibited by processing the vinylaromatic or vinylaliphatic compound in the presence of 4-hydroxy-2,2,6,6-tetramethylpiperidine-N-oxyl or ... | 03/30/1999 |
| 5877385 | Process including extractive distillation and/or dehydrogenation to produce styrene from petroleum feedstock including ethyl-benzene/xylene mixtures Disclosed is a process for recovering styrene from a feedstock containing at least styrene, ethylbenzene, and one or more aromatic or non-aromatic hydrocarbon compounds which includes separating said feedstock into a first stream relatively more concentra... | 03/02/1999 |
