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| Number | Title | Issue Date |
| 7473811 | Process for the hydrogenation of olefins The present invention relates to a process for the hydrogenation of olefins. The process comprises hydrogenation of a feed stock comprising more than 90 wt-% of olefins, carried out in a hydrogenation reactor comprising at least two reaction stages, wherein the feed... | 01/06/2009 |
| 7381854 | Selective hydrogenation of alpha-methyl-styrene to cumene A process for the selective hydrogenation of alpha-methyl-styrene (AMS) to cumene in a two catalyst system is disclosed. A crude cumene feed stream containing up to 10% AMS by weight is supplied to the first reaction zone 112 and mixed with hydrogen in a firs... | 06/03/2008 |
| 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 |
| 7326389 | Method of producing unsaturated aldehyde and/or unsaturated acid Disclosed is a shell-and-tube reactor that may be used in a method for producing unsaturated aldehydes and/or unsaturated acids from olefins by means of fixed-bed catalytic partial oxidation. The reactor includes at least one reaction zone of a first-step reaction z... | 02/05/2008 |
| 7320745 | Energy efficient method for exothermic reactions An energy efficient process scheme for a highly exothermic reaction-distillation system in which the reactor is external to the distillation column and the feed to the reactor is a mixture of at least one liquid product stream from the distillation column with or wi... | 01/22/2008 |
| 7319176 | Selective hydrogenation of acetylenes A process for removing acetylenic compounds using unsulfided metallic nickel or unsulfided metallic nickel modified with metallic Mo, Re, Bi or mixtures in which the catalyst is used alone or is used in combination with other acetylenic selective catalysts. The unsu... | 01/15/2008 |
| 7230148 | Process for hydrogenation of aromatics in hydrocarbon feedstocks containing thiopheneic compounds The present invention relates to an improved process for the hydrogenation of aromatics in hydrocarbon feedstocks containing thiopheneic compounds as impurities, the aromatics hydrogenation being conducted in a hydrogenation reactor in the presence of a nickel based... | 06/12/2007 |
| 7223894 | Process for total hydrogenation using a catalytic reactor with a hydrogen-selective membrane A process for total hydrogenation of polyunsaturated compounds that have n nonsaturations that are contained in a hydrocarbon feedstock in the presence of a catalytic reactor with a hydrogen-selective membrane is described. This process comprises the introduction of... | 05/29/2007 |
| 7175754 | Process for the production of low benzene gasoline A process for the production of low benzene content gasoline is disclosed wherein a full boiling range naphtha is fractionated to produce a light naphtha, a medium naphtha and a heavy naphtha. The benzene is contained in the medium naphtha and this stream is subject... | 02/13/2007 |
| 7153807 | Catalysts for selective hydrogenation of alkynes and alkadienes Catalysts have been discovered that are useful in hydrogenation reactions, and particularly for the selective hydrogenation of acetylene and/or methyl acetylene (MA) and/or propadiene (PD) in light olefin-rich feedstreams. These catalysts can selectively hydrogenate... | 12/26/2006 |
| 7115789 | Process for removal of alkynes and/or dienes from an olefin stream The present invention is a process for removing alkynes and/or dienes from an olefin product stream withdrawn from an oxygenate-to-olefins reactor. The process comprises hydrogenating a first olefin stream that has alkynes and/or dienes in the presence of excess hyd... | 10/03/2006 |
| 7081555 | Process for hydrogenation of aromatics in hydrocarbon feedstocks containing thiopheneic compounds The present invention relates to an improved process for the hydrogenation of aromatics in hydrocarbon feedstocks containing thiopheneic compounds as impurities, the aromatics hydrogenation being conducted in a hydrogenation reactor in the presence of a nickel based... | 07/25/2006 |
| 7070690 | Process for conversion of hydrocarbons on a catalyst with controlled acidity The invention relates to a process for conversion of hydrocarbons in the presence of at least one catalyst with controlled acidity, characterized in that the level of activity of said catalyst in isomerization of the cyclohexane is less than 0.10 and/or in that the ... | 07/04/2006 |
| 7045669 | Dual pressure catalytic distillation hydrogenation column system for the front end of an ethylene plant The charge gas from the thermal cracking of a hydrocarbon feedstock is processed in a front-end catalytic distillation hydrogenation system of an olefins plant to more effectively recover ethylene and propylene product and to process the by-products. The rate of fou... | 05/16/2006 |
| 7041860 | Process for the selective hydrogenation of alkynes An improved selective hydrogenation process for removing acetylenic impurities such as vinyl acetylene, ethyl acetylene, propyl acetylene and acetylene in a steam cracked crude butadiene stream by selective hydrogenation is carried out in two steps. In the first ste... | 05/09/2006 |
| 7038097 | Dual bed process using two different catalysts for selective hydrogenation of acetylene and dienes It has been discovered that a dual bed process using two different catalysts for the selective hydrogenation of acetylene and/or methyl acetylene (MA) and/or propadiene (PD) in a light olefin-rich feedstream can be accomplished with less selectivity to making oligom... | 05/02/2006 |
| 6858766 | Process for selectively hydrogenating mixed phase front end C2-C10 greater unsaturated hydrocarbons The present invention provides a process for selectively hydrogenating C2-C10 greater unsaturated hydrocarbons (acetylenes and diolefins) at the upstream side of a front depropanizer or front deethanizer in an olefin production plant. After pas... | 02/22/2005 |
| 6855245 | Hydrogenation process The invention is directed to a process for the hydrogenation of a sulfur containing feedstock, having a sulfur content of less than 50 ppm, wherein the feedstock is hydrogenated in the presence of a precious metal catalyst and a nickel-catalyst, said process being c... | 02/15/2005 |
| 6837989 | Cycle oil conversion process The invention relates to a process for converting cycle oils produced in catalytic cracking reactions into olefin and naphtha. More particularly, the invention relates to a process for hydroprocessing a catalytically cracked light cycle oil, and then re-cracking it ... | 01/04/2005 |
| 6822128 | Flow control in a three-phase monolithic catalyst reactor A method is disclosed for maintaining a volumetric gas to liquid ratio in a segmented gas/liquid flow along a reactor of monolithic catalyst beds in series. The present invention includes the steps of: initiating the segmented gas/liquid flow at a first end of the r... | 11/23/2004 |
| 6759562 | Olefin plant recovery system employing a combination of catalytic distillation and fixed bed catalytic steps Presented is an improvement to a previous invention involving the catalytic hydrogenation of the C2 to C5 and heavier acetylenes and dienes in a thermally cracked feed stream without significantly hydrogenating the C2 and C3 | 07/06/2004 |
| 6740787 | Process for treatment of C4 hydrocarbons that comprise butadiene and acetylene compounds that comprise stages for distillation and selective hydrogenation A process for treatment of a batch with four carbon atoms that contains diene compounds and a minor portion of acetylene compounds is described. A portion of the fluid that circulates in a distillation zone that is enriched with acetylene compounds is drawn off late... | 05/25/2004 |
| 6734328 | Process for the selective hydrogenation of alkynes An improved selective hydrogenation process for removing acetylenic impurities such as vinyl acetylene, ethyl acetylene, propyl acetylene and acetylene in a steam cracked crude butadiene stream by selective hydrogenation is carried out in two steps. In the first ste... | 05/11/2004 |
| 6693225 | Process for hydrogenating cuts containing hydrocarbons, in particular unsaturated molecules containing at least two double bonds or at least one triple bond Hydrogenation of a liquid cut containing hydrocarbons, in particular unsaturated molecules containing at least two double bonds or at least one triple bond, is described wherein the unsaturated molecules are at least partially hydrogenated to less unsatur... | 02/17/2004 |
| 6627778 | Selective hydrogenation process for removing C10-C16 diolefins The present invention provides an improved selective hydrogenation process for removing C10 -C16 diolefins in the product from dehydrogenation of C10 -C16 paraffins to mono-olefins, which process includes bringi... | 09/30/2003 |
| 6569318 | Process for conversion of hydrocarbons on a catalyst with controlled acidity The invention relates to a process for conversion of hydrocarbons in the presence of at least one catalyst with controlled acidity, characterized in that the level of activity of said catalyst in isomerization of the cyclohexane is less than 0.10 and/or i... | 05/27/2003 |
| 6414205 | Process for the removal of MAPD from hydrocarbon streams A process for the selective hydrogenation of the methyl acetylene and propadiene (MAPD) in a propylene rich stream is disclosed wherein the selective hydrogenation is carried out stepwise (a) first in a single pass fixed bed reactor and then (b) in a dist... | 07/02/2002 |
| 6410811 | Selective hydrogenation process comprising partial separation of hydrogen by a membrane upstream of a reactive column The process of the invention is a process for selective hydrogenation of a hydrocarbon feed containing hydrogen and C2+ hydrocarbons, characterized in that it comprises at least one step for separating a fraction of the hydrogen cont... | 06/25/2002 |
| 6407300 | Apparatus and process for hydrogenations An apparatus and process for treating a complex mixture of hydrocarbons containing undesirable olefinic compounds to remove the mono olefins and diolefins in two stages and separate a desirable key component from the mixture, by first treating the key com... | 06/18/2002 |
| 6261442 | Process for converting hydrocarbons by treatment in a distillation zone comprising withdrawing a stabilized distillate, associated with a reaction zone, and its use for hydrogenating benzene The invention provides a process for converting a hydrocarbon feed in which said feed is treated in a distillation zone producing an overhead vapour distillate and a bottom effluent, associated with an at least partially external reaction zone comprising ... | 07/17/2001 |
| 6179996 | Selective purge for hydrogenation reactor recycle loop Processes and apparatus for providing improved contaminant removal and hydrogen recovery in hydrogenation reactors, particularly in refineries and petrochemical plants. The improved contaminant removal is achieved by selective purging, by passing gases in... | 01/30/2001 |
| 6121333 | Process for the preparation of hydrocarbons from synthesis gas Process for the production of hydrocarbons from synthesis gas which comprises: a) feeding to a reactor for Fischer-Tropsch reactions, containing a catalyst based on supported cobalt, a synthesis gas in molar ratios H2 /CO ranging from 1 to 3; b... | 09/19/2000 |
| 6011188 | Multi-bed selective hydrogenation of acetylenes Compensation for catalyst activity decline in multi-bed selective hydrogenation of acetylenes in the presence of olefins by providing inter-bed heating so that the product from the first bed is heated before it is fed to the second bed, and the temperatur... | 01/04/2000 |
| 5998683 | Process for forming cyclopentane from dicyclopentadiene A method for producing a cyclopentane product which comprises the following steps: (a) cracking dicyclopentadiene to form a cyclopentadiene-rich stream and a higher boiling liquids stream; (b) separating the cyclopentadiene-rich stream from the higher boi... | 12/07/1999 |
| 5925799 | Catalytic distillation and hydrogenation of heavy unsaturates in an olefins plant In an olefins plant for the production and recovery of ethylene and propylene, the hydrogenation of the C2 acetylenes, the C3 acetylenes and dienes and the C4 and heavier acetylenes, dienes and olefins and the selective se... | 07/20/1999 |
| 5817227 | Process for the selective reduction to the content of benzene and light unsaturated compounds in a hydrocarbon cut The invention is concerned with a process for treating a charge of which the major part is constituted by hydrocarbons comprising at least 5 carbon atoms per molecule and comprising at least one unsaturated compound comprising at the most six carbon atoms... | 10/06/1998 |
| 5741414 | Method of manufacturing gas oil containing low amounts of sulfur and aromatic compounds There is provided a method of manufacturing gas oil containing low-sulfur and low-aromatic-compound content, said method including a first step of putting distilled petroleum to contact with hydrogen gas in the presence of a hydrotreating catalyst to redu... | 04/21/1998 |
| 5414170 | Mixed phase front end C2 acetylene hydrogenation The present invention provides an improved process for selectively hydrogenating acetylenes in an olefin plant process stream by selectively hydrogenating the acetylenes downstream of a front end depropanizer and upstream of further separation zones such ... | 05/09/1995 |
| 5345019 | Method of hydrocracking paraffins emanating from the Fischer-Tropsch process using catalysts based on H-Y zeolite A method of hydrocracking charges emanating from the Fischer-Tropsch process, in which: (a) hydrogen is reacted with the charge in contact with a catalyst 1 in a first reaction zone, the said catalyst 1 comprising at least one alumina-based matrix and at ... | 09/06/1994 |
| 5306852 | Process for selective hydrogenation, in particular of diolefins in steam cracking volatiles, with a catalyst in the form of beds which are used successively The invention concerns a hydrogenation process, in particular for the selective hydrogenation of diolefins in volatiles produced by steam cracking or other cracking processes, in which the catalyst is distributed in a plurality of beds. It is characterize... | 04/26/1994 |
