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| Number | Title | Issue Date |
| 8053621 | Solvent treatment methods and polymerization processes employing the treatment methods A method for treating a hydrocarbon solvent, the method comprising continuously introducing a hydrocarbon solvent to a liquid medium containing hydrogen ions; allowing the hydrocarbon solvent to be in contact with the liquid medium for at least 1 minute; continuousl... | 11/08/2011 |
| 7399404 | Reduction of the content of compounds containing oxygen and/or nitrogen in material flows containing isobutene A process for reducing the content of oxygen-containing and/or nitrogen-containing compounds in streams having an isobutene content of at least 10% by weight, which comprises passing the stream in the liquid state at a temperature T [in K] and a linear velocity v [i... | 07/15/2008 |
| 7396973 | Simulated moving bed adsorptive separation process for handling multiple feedstocks The present invention discloses a means to improve the production capacity and feedstock handling flexibility of a simulated moving bed adsorptive separation process by introducing a second feed stream to the adsorbent chamber, such second feed stream comprising a f... | 07/08/2008 |
| 7368618 | Process for removal of oxygenates from a paraffin stream The present invention comprises a process for removal of oxygenates from a paraffin-rich or olefin-rich paraffin stream which comprises passing a feed stream, comprising one or more C10 to C15 feed paraffins or C10 to C15 ... | 05/06/2008 |
| 7357912 | Method of catalytic decomposition of water A method of catalytically decomposing water, which comprises contacting water with a composite catalyst comprising a solid acid catalyst and a solid base catalyst at an elevated temperature, wherein the composite catalyst contains the solid acid catalyst in an amoun... | 04/15/2008 |
| 7326821 | Removal of oxygenate from an olefin stream This invention is to a process for removing dimethyl ether from an olefin stream. The process includes contacting the olefin stream with a molecular sieve that has improved capacity to adsorb the dimethyl ether from the olefin stream. The molecular sieve used to rem... | 02/05/2008 |
| 7294746 | Processes for removal of color bodies from polytrimethylene ether glycol polymers Processes for reducing color in PO3G are provided. The processes include contacting PO3G with an adsorbent and then separating the PO3G from the adsorbent by, for example, filtration. The process provides PO3G having an APHA color preferably less than about 50. The ... | 11/13/2007 |
| 7102044 | Process for removal of oxygenates from a paraffin stream The present invention comprises a process for removal of oxygenates from a paraffin-rich or olefin-rich paraffin stream which comprises passing a feed stream, comprising one or more C10 to C15 feed paraffins or C10 to C15 ... | 09/05/2006 |
| 7009082 | Removal of color bodies from polytrimethylene ether glycol polymers A process is described for reducing the discoloration of PO3G. The discolored polymer is contacted with adsorbent and separated therefrom, for instance, by filtration. The treated polytrimethylene, preferably, has an APHA color of less than about 50 and a molecular ... | 03/07/2006 |
| 6987152 | Feed purification at ambient temperature A method for olefin polymerization is provided. A feed stream comprising more than 0.1 ppm by volume of oxygen and 0.3 ppm by volume of water is passed through a first packed bed to selectively remove at least a portion of the oxygen. The feed stream is then passed ... | 01/17/2006 |
| 6960700 | Adsorbent beds for removal of hydrides from hydrocarbons A process for removal of trace impurities of hydrides of arsenic, phosphorus, antimony, silicon, and boron and sulfur and oxygenates and compounds containing these impurities from a hydrocarbon stream comprising contacting the hydrocarbon stream with an adsorbent ma... | 11/01/2005 |
| 6805790 | Process and an apparatus for preparation of petroleum hydrocarbon solvent with improved color stability from nitrogen rich crude oil A process and an apparatus for the preparation of petroleum hydrocarbon solvent with improved color stability from crude oils having high concentration of nitrogenous compounds which comprises passing said petroleum hydrocarbon stream containing substantial amount o... | 10/19/2004 |
| 6797854 | Process for drying a gaseous or liquid mixture with the aid of an adsorber composed of alumina and of a molecular sieve The invention relates to a process for drying a gaseous or liquid mixture by passing the said mixture into an adsorber, characterized in that the water adsorption equilibrium zone of the adsorber comprises an upstream alumina zone and a downstream molecular sieve zo... | 09/28/2004 |
| 6761818 | Heavy oil-solid composition and method for preparing the same The invention includes a compositon of matter comprising a heavy oil having dispersed therein surface modified solid wherein said surface modified solids comprise solids having adsorbed thereon air oxidized polar hydrocarbons from said heavy oil and wherein said sur... | 07/13/2004 |
| 6753452 | Removal of polar contaminants from aromatic feedstocks A process is described for removing polar compounds from an aromatic feedstock which contains polar compounds. The process comprises contacting the feedstock in an adsorption zone at a temperature of less than or equal to 130° C. with an adsorbent selective for the... | 06/22/2004 |
| 6733572 | Separation of propylene and dimethylether from hydrocarbon mixtures The present invention is a process for separating propylene and dimethylether from a mixture comprising propylene, dimethylether, and propane. The mixture is passed through a bed of an adsorbent comprising a porous crystalline material having (i) diffusion time cons... | 05/11/2004 |
| 6617482 | Removable of polar contaminants from aromatic feedstocks A process is described for removing polar compounds from an aromatic feedstock which contains polar compounds and which is then used in an alkylation process. The process comprises contacting the feedstock in an adsorption zone at a temperature of less th... | 09/09/2003 |
| 6524468 | Heavy oil - solid composition and method for preparing the same The invention includes a compositon of matter comprising a heavy oil having dispersed therein surface modified solid wherein said surface modified solids comprise solids having adsorbed thereon air oxidized polar hydrocarbons from said heavy oil and where... | 02/25/2003 |
| 6313362 | Aromatic alkylation process Akylation product is contacted with a purification medium in a liquid phase pre-reaction step to remove impurities and form a purified stream. The purified stream may then be further processed by liquid phase transalkylation to convert the polyalkylated a... | 11/06/2001 |
| 6288299 | Method for eliminating inhibitors of polymerization of monomer mixtures using an optimized alumina The invention relates to a process for adsorption of polymerization inhibitors from ethylenically unsaturated monomers, in which these inhibitors are placed in contact with an alumina exhibiting a volume of pores of diameter greater than 100 Å of at leas... | 09/11/2001 |
| 6168769 | Olefin purification A process for purifying a fluid stream contaminated with carbon dioxide is provided which comprises contacting, under conditions sufficient to substantially remove the contaminated carbon dioxide from the fluid stream which contains at least one C2 | 01/02/2001 |
| 6118037 | Process for the removal of contaminant compounds containing one or more heteroatoms of sulfur, nitrogen and/or oxygen from hydrocarbon streams Process for the removal of contaminant compounds containing one or more heteroatoms of sulfur, nitrogen and/or oxygen from hydrocarbon streams characterized in that it comprises: an adsorption step in which said compounds are adsorbed by means of an adsor... | 09/12/2000 |
| 6111162 | Process for removing oxygenated contaminants from hydrocarbon streams Process for selectively removing oxygenated contaminants from streams prevalently containing hydrocarbons with from 3 to 8 carbon atoms characterized in that it comprises an adsorption step wherein said contaminants are adsorbed by an adsorbent essentiall... | 08/29/2000 |
| 6096934 | Oxidative coupling of methane with carbon conservation A process for converting methane to ethane and ethylene through oxidative coupling of methane and carbon conservation has been developed. The process begins by contacting methane and an oxygen-containing stream with an oxidative coupling catalyst that is ... | 08/01/2000 |
| 6090993 | Process for the preparation of aromatic solvent from a dioxane contaminated aromatic stream A process for preparing benzene containing less than 1 ppm (wt) dioxane from an aromatic stream containing benzene which is contaminated with dioxane, the process including providing an aromatic stream containing benzene which is contaminated with dioxane... | 07/18/2000 |
| 6039865 | Removal of phosphates from hydrocarbon streams Phosphates can be removed from a hydrocarbon stream by contacting said stream with a ceramic formed of a basic material which is insoluble in the hydrocarbon stream. A ceramic as used in this patent document is a solid solution formed by calcination of a ... | 03/21/2000 |
| 5972303 | Olefin purification A process for purifying a fluid stream contaminated with carbon dioxide is provided which comprises contacting, under conditions sufficient to substantially remove the contaminated carbon dioxide from the fluid stream which contains at least one C2 | 10/26/1999 |
| 5955045 | Removal of nitrogen oxides from gases For selectively removing nitrogen oxides from a carrier gas that contains hydrocarbons, the nitrogen oxides are removed by chemisorption on metal oxides, without the occurrence of undesirable secondary reactions. The metal oxides are preferably formed fro... | 09/21/1999 |
| 5912395 | Raffinate line flush in simulated continuous moving bed adsorptive separation process The capacity of a simulated moving bed adsorptive separation process is increased by flushing the contents of the transfer line just previously used to remove the raffinate stream from the adsorbent chamber back into the adsorbent chamber. This step is pe... | 06/15/1999 |
| 5888402 | Process for the purification of a hydrocarbon stream Process for the purification of a hydrocarbon stream by removing contaminating compounds contained in the hydrocarbon stream by contact with a solid adsorbent material and withdrawing a purified hydrocarbon stream, the improvement of which comprises passi... | 03/30/1999 |
| 5725756 | In situ mitigation of coke buildup in porous catalysts with supercritical reaction media A method to minimize catalyst deactivation rate and coke laydown, and maximize desired reaction rate in processing of industrially significant reactions under supercritical conditions to generate a reaction mixture stream including formed reaction product... | 03/10/1998 |
| 5690809 | In situ mitigation of coke buildup in porous catalysts by pretreatment of hydrocarbon feed to reduce peroxides and oxygen impurities An improved process is provided for in situ mitigation of coke buildup and porous catalyst used for the processing of hydrocarbon feed stocks. The process exhibits improved catalyst activity over extended periods and the process comprises the pretreatment... | 11/25/1997 |
| 5659107 | Separation of cyclopentadiene from dicyclopentadiene Cyclopentadiene is separated from dicyclopentadiene by means of a sorbent material which contains (i) alkali metal oxide(s) and/or hydroxide(s) and (ii) an inorganic support material. The more preferred sorbent material is Na2 O and/or NaOH on ... | 08/19/1997 |
| 5510566 | Regenerant recycle process for oxygenate removal In methyl tertiary butyl ether (MTBE) plant n-butane is used to regenerate a molecular sieve adsorption bed of an oxygen removal unit, and contaminated n-butane is purified by distillation and recycled for further regeneration. The requirement for n-butan... | 04/23/1996 |
| 5466364 | Performance of contaminated wax isomerate oil and hydrocarbon synthesis liquid products by silica adsorption The daylight stability, foaming characteristics, color, engine performance test behavior, oxygenates content, and thermal stability of wax isomerate oils and/or hydrocarbon synthesis liquid products are improved by the process of contacting the aforesaid ... | 11/14/1995 |
| 5427689 | Separation of polar substances from hydrocarbons A process for separating polar substances (preferably water, alcohols, ethers, aldehydes, nitriles) from hydrocarbon fluids employs a sorbent comprising aluminum borate and zirconium borate. Preferably, the sorbent composition has been prepared by copreci... | 06/27/1995 |
| 5396021 | Deactivation of drier material for olefin reactions A process for reducing the loss of monomers from a polymerization recycle stream comprising steam treating a molecular sieve used to dry the recycle stream to remove acidic sites within the sieve. The steam treatment is conducted at a temperature of betwe... | 03/07/1995 |
| 5349117 | Process for sorption separation A process for separating at least one component from a mixture of components which comprises contacting the mixture with a sorbent structure comprising a film of interconnected zeolite crystals bonded to a substrate, said sorbent structure being character... | 09/20/1994 |
| 5336836 | Removal of acetaldehyde from hydrocarbons Acetaldehyde is removed from C3 -C15 hydrocarbons by contacting the hydrocarbon or a hydrocarbon mixture in liquid phase with a zeolite whose pores have a width which is greater than 0.3 nm and up to 0.75 nm.... | 08/09/1994 |
| 5302771 | Process for upgrading the quality of light ends The present invention is directed to a process for removing impurities from hydrocarbon streams, preferably light ends, such as propylene and ethylene, which is preferably in the liquid phase, by contacting the hydrocarbon stream containing an initial amo... | 04/12/1994 |
