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| Number | Title | Issue Date |
| 7465846 | Extraction of oxygenates from a hydrocarbon stream This invention relates to a commercially viable process for extracting oxygenates from a hydrocarbon stream, typically a fraction of the condensation product of a Fischer-Tropsch reaction, while preserving the olefin content of the condensation product. The oxygenat... | 12/16/2008 |
| 7442847 | Removing diamondoid components from natural gas at reduced temperatures A process for separating diamondoids and water from a gas stream that is being cooled to below atmospheric temperature is disclosed. The multi-component gas stream is contacted with a diamondoid solvent and a water solvent (glycol) simultaneously. The feed gas can b... | 10/28/2008 |
| 7435318 | Ionic liquids as selective additives for separation of close-boiling or azeotropic mixtures The invention relates to a process for separating close-boiling, homo- and heteroazeotropic mixtures by using ionic liquids. Due to the selectivity and unusual combination of properties of the ionic liquids the process is superior to conventional extractive rectific... | 10/14/2008 |
| 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 |
| 7388121 | Process to separate butadiene dimers The invention relates to a process to separate butadiene dimers from a mixture comprising butadiene dimers and alkyl-3-pentenoate and/or isomers thereof wherein the butadiene dimers are separated from said mixture by distillation in the presence of an alcohol and in... | 06/17/2008 |
| 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 |
| 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 |
| 7223331 | Method for settling suspended fine inorganic solid particles from hydrocarbon slurry and additive for use therewith Disclosed is a method for settling suspended finely divided inorganic solid particles from a hydrocarbon slurry using an additive. The additive comprises (a) a hydroxy-terminated polyoxyalkylate chain(s) containing polymer having at least one oxygen atom and at leas... | 05/29/2007 |
| 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 |
| 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 |
| 7161055 | Method of extracting and isolating minor components from vegetable oil A process for the separation and recovery of minor components from vegetable oil such as palm oil. Esterified palm oil is subjected to molecular distillation giving a concentrate rich in minor components. The concentrate is then adsorbed to adsorbents such as normal... | 01/09/2007 |
| 7141712 | Recovery of palm phytonutrients A process for the recovery of phytonutrients such as carotenes, phospholipids and ubiquinones from palm oil esters is disclosed. This process comprises the steps of vacuum distillation, treatment and purification of concentrate containing these phytonutrients. The a... | 11/28/2006 |
| 7097815 | Hydroprocessing process A process for hydroprocessing a hydrocarbon feedstock, includes the steps of providing a hydrocarbon feed having an initial characteristic; providing a first hydrogen-containing gas; feeding the hydrocarbon feed and the first hydrogen-containing gas cocurrently to a... | 08/29/2006 |
| 7060866 | High pressure separation of dimethyl ether from an olefin stream Disclosed is a method of removing dimethyl ether from an ethylene and/or propylene containing stream. Dimethyl ether is removed at a high pressure, preferably in a distillation column. The high pressure separation has the benefit of providing a relatively low bottom... | 06/13/2006 |
| 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 |
| 6973968 | Method of natural gas production A method and system for dissociating methane hydrate deposits in-situ is provided wherein an oxidizer fluid and a supply of fuel, both at a pressure higher than that of the methane hydrate deposit, are supplied and delivered to the methane hydrate deposit. The fuel ... | 12/13/2005 |
| 6946017 | Process for separating carbon dioxide and methane A process for separation of carbon dioxide and methane in which a gas mixture comprising carbon dioxide and methane is brought into contact with a methane hydrate solid material disposed in a reactor vessel, whereby the methane hydrate is displaced by carbon dioxide... | 09/20/2005 |
| 6939994 | Process for the production of bisphenol-A Bisphenol-A (BPA) is efficiently produced from phenol and acetone via countercurrent and multistage contact with a solid acid catalyst in the presence of an agent that enhances the removal of water of reaction from the reaction zone. A preferred contacting device is... | 09/06/2005 |
| 6916361 | Method for separation of non-hydrocarbon gases from hydrocarbon gases A method for the separation of non-hydrocarbon gases from hydrocarbon gases, the method comprising the steps of: adding water and an agent adapted to reduce the interfacial tension between water and hydrocarbons to a first stream of desired hydrocarbon and undesired... | 07/12/2005 |
| 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 |
| 6863779 | Distillation of styrene A process for the distillation of vinylaromatic monomers in the presence of 4-tert-butylcatechol (TBC) and oxygen, wherein no aromatic nitro or amino compound is present in any effective amount. The process is particularly suitable for destabilizing and purifying st... | 03/08/2005 |
| 6844480 | Method of separating dimethyl ether from an olefin stream This invention is directed to a method of removing dimethyl ether from an olefin stream. Dimethyl ether is removed from the olefin stream by first separating the olefin stream into a first stream comprising dimethyl ether and lighter boiling point compounds, and a s... | 01/18/2005 |
| 6838587 | Method of removing oxygenate contaminants from an olefin stream This invention is directed to a method of removing acetaldehyde, CO2 and/or water from an ethylene and/or propylene containing stream. In this invention, acetaldehyde and C4+ olefins are substantially removed from the ethylene and/or propylene ... | 01/04/2005 |
| 6797846 | Fibrous crystal aggregates, preparation method thereof and use thereof A crystal substance formed by precipitating as fibrous aggregates by making a metal aliphatic carboxylate dissolve completely in pure water, stirring, and gradually cooling the resulting solution. A method of preparing the fibrous crystal aggregates. A material for ... | 09/28/2004 |
| 6781026 | Aromatics purification from petroleum streams A process for separating a feed mixture comprising at least one aromatic hydrocarbon and at least one non-aromatic hydrocarbon by extractive distillation (ED) utilizing a solvent mixture comprising sulfolane and at least one co-solvent. The co-solvent is an alkyl su... | 08/24/2004 |
| 6734332 | Process for enriching cis or trans-isomers in an olefin stream An olefin product rich in cis- or trans-isomers can be produced by reacting the mixed olefin feedstock with an linear polyaromatic compound such as anthracene under heat, then separating the unreacted olefin enriched in cis-isomer. The remaining linear unreacted pol... | 05/11/2004 |
| 6720468 | Process for the removal of conjugated olefins from a monoolefin stream A process for the separation of conjugated olefins from monoolefins in a fluid comprising such conjugated olefins and monoolefins using a Diels-Alder reaction to provide a fluid comprising a Diels-Alder adduct and monoolefins. The fluid comprising such Diels-Alder a... | 04/13/2004 |
| 6664433 | Process for the purification of aromatic hydrocarbons and process for the preparation of high-purity aromatic hydrocarbons This invention provides a process for purifying to a high degree of purity aromatic hydrocarbons containing impurities which are difficult to separate by distillation such as sulfur compounds and nitrogen compounds. The process of this invention for purif... | 12/16/2003 |
| 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 |
| 6613197 | Method for isolation of barely volatile organic compounds A method and apparatus for isolation of a barely volatile organic compound in a sample suspected to contain the same, e.g. a dioxin, which includes continuously adding superheated steam and a volatile and hardly water-soluble/water-insoluble solvent to a ... | 09/02/2003 |
| 6572831 | Materials treatment A material contaminated with a solvent is treated with a hydrofluorocarbon to remove the contaminant. The hydrofluorocarbon can be tetrafluoroethane.... | 06/03/2003 |
| 6570045 | Methods of solidifying low-boiling-point hydrocarbon and handling the same, and regeneration thereof Disclosed are a method of solidifying a low-boiling-point hydrocarbon, wherein the low-boiling-point hydrocarbon (including hydrocarbons which are gaseous at ordinary temperature) is brought into contact with a metal salt of an aliphatic carboxylic acid, ... | 05/27/2003 |
| 6565742 | Aromatics separation process and method of retrofitting existing equipment for same An improved process for the recovery of aromatic compounds from a mixture containing aromatic and non-aromatic compounds and method for retrofitting existing equipment for the same is provided. The improved process comprises the steps of recovering aromat... | 05/20/2003 |
| 6559248 | Process of removing contaminants from an olefin stream using extractive distillation Disclosed is a method of purifying olefin containing oxygenate contaminants. The method incorporates the use of extractive distillation. Under the appropriate conditions, olefins containing very low levels of oxygenate contaminants can be recovered.... | 05/06/2003 |
| 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 |
| 6417415 | Methods of solidifying low-boiling-point hydrocarbon and handling the same, and regeneration thereof Disclosed are a method of solidifying a low-boiling-point hydrocarbon, wherein the low-boiling-point hydrocarbon (including hydrocarbons which are gaseous at ordinary temperature) is brought into contact with a metal salt of an aliphatic carboxylic acid, ... | 07/09/2002 |
