Patents by Inventor Pochen Chu
Pochen Chu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5334795Abstract: Ethylbenzene is produced by the alkylation of benzene with ethylene in the presence of an alkylation catalyst having a particular structure defined by its X-ray diffraction pattern. A preferred catalyst is the zeolite MCM-22. The process is typically carried out at a temperature of 300.degree. to 1000.degree. F. but the catalyst provides sufficient activity for the reaction to be carried out at temperatures below 700.degree. F. Liquid phase operation is preferred, giving a lower yield of polyethylated products. The use of the selected catalyst also results in a reduction of the xylene impurity level to values below 500 ppm in the product.Type: GrantFiled: October 27, 1992Date of Patent: August 2, 1994Assignee: Mobil Oil Corp.Inventors: Pochen Chu, Michael E. Landis, Quang N. Le
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Patent number: 5286370Abstract: A layered catalyst contains a core of at least one, and preferably three, molecular sieve components within a shell layer of reduced molecular sieve content. A preferred catalyst consists of a core of a large pore molecular sieve, preferably a dealuminized Y-type zeolite, a shape selective paraffin cracking/isomerization component, preferably HZSM-5, and a shape selective aliphatic aromatization component, preferably gallium ZSM-5, within a shell of an alumina-rich, matrix. The shell can capture metals from the feeds being processed, it can act as a metals sink, and can remove metals form the unit by attrition. The catalyst is preferably prepared by forming the core and then coating or encapsulating the core with a shell having a reduced molecular sieve content. The shell may contain a pillared clay or other very large pore cracking component. The shell may be an attritable coating of an amorphous rare earth oxide, aluminum oxide and aluminum phosphate composite, which traps metals.Type: GrantFiled: December 17, 1991Date of Patent: February 15, 1994Assignee: Mobil Oil CorporationInventors: Pochen Chu, Albin Huss, Jr., Hartley Owen, Joseph A. Herbst, Garry W. Kirker, Paul H. Schipper
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Patent number: 5236681Abstract: There is provided a method for synthesizing layered silicates such as magadiite and kenyaite. The source of silica used in this method is freshly precipitated from a silicate solution. For example, this silica source may be obtained by treating an aqueous solution of sodium silicate with sulfuric acid to form an amorphous silica precipitate. This silica precipitate is not dried to reduce its activity prior to use.Type: GrantFiled: November 30, 1989Date of Patent: August 17, 1993Assignee: Mobil Oil Corp.Inventors: Pochen Chu, Garry W. Kirker, Sowmithri Krishnamurthy, James C. Vartuli
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Patent number: 5182090Abstract: There is provided a method for making large crystal size ZSM-5. This method involves the use of two organic cations, specifically tetrapropylammonium (TPA) and tetramethylammonium (TMA) cations, in the reaction mixture. This method further involves the use of a source of deliberately added alumina, such as aluminum sulfate, in the reaction mixture.Type: GrantFiled: February 19, 1992Date of Patent: January 26, 1993Assignee: Mobil Oil Corp.Inventors: Francis G. Dwyer, Pochen Chu, William E. Cormier, Jr.
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Patent number: 5179054Abstract: A layered catalyst suited to the catalytic cracking of heavy feeds comprises a core and a shell. The shell comprises at least 5 wt % of at least 1 molecular sieve having openings of at least 8 angstroms. The core comprises at least 10 wt % of at least 1 molecular sieve having openings comprising a 12 or less-membered ring and has a reduced, if any, content of said molecular sieve having openings of at least 8 angstroms, relative to its concentration in the shell. Suitable molecular sieve materials having openings of at least 8 angstroms include MCM-41, VPI-5, MCM-9 and layered metal oxides, e.g., pillared clays. The required molecular sieve of the core can include zeolite Y, Ultrastable Y or intermediate pore size zeolites such as ZSM-5. The shell which may further contain a metals passivator can act as a metals sink, and can remove metals from the unit by attrition. The catalyst is preferably prepared by forming the core and then coating or encapsulating the core with a shell material.Type: GrantFiled: July 24, 1991Date of Patent: January 12, 1993Assignee: Mobil Oil CorporationInventors: Paul H. Schipper, Hartley Owen, Joseph A. Herbst, Garry W. Kirker, Albin Huss, Jr., Pochen Chu
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Patent number: 5160500Abstract: There is provided a method for preparing a zeolite other than ZSM-5 from a reaction mixture comprising a mixed organic directing agent which is a combination of (a) an organic nitrogen containing compound such as an amine or a quaternary ammonium compound and (b) an alcohol and/or diol. Particular zeolites synthesized by this method include ZSM-22 and ZSM-23. The use of an alcohol or a diol may inhibit the coformation of ZSM-5. Especially when used to prepare ZSM-23, this method enables the preparation of more catalytically active ZSM-23 of reduced crystallite size and also enables the use of lower crystallization temperatures. Particular mixed organic directing agents for the preparation of ZSM-23 are combinations of (a) pyrrolidine and (b) ethanol or ethylene glycol.Type: GrantFiled: October 30, 1991Date of Patent: November 3, 1992Assignee: Mobil Oil CorporationInventors: Pochen Chu, Donald J. Klocke, David O. Marler, John P. McWilliams, James C. Vartuli
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Patent number: 5140949Abstract: A hydrous aluminosilicate adsorbent composition in which the active adsorbent is a mixture of non-fibrous clay with non-fibrous zeolite. The composition is useful as a feed supplement in animal husbandry, and as a topical adsorbent for veterinary use. The mixture has a high capacity for adsorption of ammonium cations, and a synergistically high selectivity for their adsorption. Beneficial effects as feed supplement may arise from lowering the amount of ammonia passed to the liver from the alimentary canal.Type: GrantFiled: September 12, 1991Date of Patent: August 25, 1992Assignee: Mobil Oil CorporationInventors: Pochen Chu, William E. Garwood
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Patent number: 5079201Abstract: A hydrous aluminosilicate adsorbent composition in which the active adsorbent is a mixture of non-fibrous clay with non-fibrous zeolite. The composition is useful as a feed supplement in animal husbandry, and as a topical adsorbent for veterinary use. The mixture has a high capacity for adsorption of ammonium cations, and a synergistically high selectivity for their adsorption. Beneficial effects as feed supplement may arise from lowering the amount of ammonia passed to the liver from the alimentary canal.Type: GrantFiled: September 19, 1989Date of Patent: January 7, 1992Assignee: Mobil Oil Corp.Inventors: Pochen Chu, William E. Garwood
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Patent number: 5077253Abstract: A layered catalyst contains a core of at least one, and preferably three, molecular sieve components within a shell layer of reduced molecular sieve content. A preferred catalyst consists of a core of a large pore molecular sieve, preferably a dealuminized Y-type zeolite, a shape selective paraffin cracking/isomerization component, preferably HZSM-5, and a shape selective aliphatic aromatization component, preferably gallium ZSM-5, within a shell of an alumina-rich, matrix. The shell can capture metals from the feeds being processed, it can act as a metals sink, and can remove metals from the unit by attrition. The catalyst is preferably prepared by forming the core and then coating or encapsulating the core with a shell having a reduced molecular sieve content. The shell may contain a pillared clay or other very large pore cracking component. The shell may be an attritable coating of an amorphous rare earth oxide, aluminum oxide and aluminum phosphate composite, which traps metals.Type: GrantFiled: May 1, 1990Date of Patent: December 31, 1991Assignee: Mobil Oil CorporationInventors: Pochen Chu, Albin Huss, Jr., Hartley Owen, Joseph A. Herbst, Garry W. Kirker, Paul H. Schipper
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Patent number: 5063038Abstract: There is provided a method for preparing a zeolite other than ZSM-5 from a reaction mixture comprising a mixed organic directing agent which is a combination of (a) an organic nitrogen containing compound such as an amine or a quaternary ammonium compound and (b) an alcohol and/or diol. Particular zeolites synthesized by this method include ZSM-22 and ZSM-23. The use of an alcohol or a diol may inhibit the coformation of ZSM-5. Especially when used to prepare ZSM-23, this method enables the preparation of more catalytically active ZSM-23 of reduced crystallite size and also enables the use of lower crystallization temperatures. Particular mixed organic directing agents for the preparation of ZSM-23 are combination of (a) pyrrolidine and (b) ethanol or ethylene glycol.Type: GrantFiled: August 31, 1987Date of Patent: November 5, 1991Assignee: Mobil Oil Corp.Inventors: Garry W. Kirker, Donald J. Klocke, James C. Vartuli, Pochen Chu, David O. Marler, John P. McWilliams
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Patent number: 5047141Abstract: Organic compound conversion over catalyst comprising the product of a method for controlling the catalytic activity of a large pore molecular sieve which contains framework boron is provided. Control is effected by treatment with a solution of a metal salt under conditions such that metal is incorporated into the molecular sieve framework.Type: GrantFiled: January 16, 1990Date of Patent: September 10, 1991Assignee: Mobil Oil CorporationInventor: Pochen Chu
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Patent number: 5043512Abstract: A process is provided for converting feedstock alkylaromatic compounds by isomerization over a catalyst comprising MCM-22.Type: GrantFiled: August 31, 1990Date of Patent: August 27, 1991Assignee: Mobil Oil Corp.Inventors: Pochen Chu, Garry W. Kirker, John D. Kushnerick, David O. Marler
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Patent number: 5036159Abstract: Ternary oxide phases, including copper oxide, which exhibit unusal electronic properties, have been determined to exhibit catalytic function for the oxidiation of carbon monoxide, the hydrogenation of ethylene and the cracking of hydrocarbons.Type: GrantFiled: June 30, 1989Date of Patent: July 30, 1991Assignee: Mobil Oil CorporationInventors: Brent A. Aufdembrink, Arthur W. Chester, Pochen Chu
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Patent number: 5034362Abstract: There are provided aromatic conversion reactions for preparation of dialkylbenzenes, such as xylene and ethyltoluene, of enhanced para isomer content with a zeolitic catalyst composition of improved shape selectivity. The catalysts comprise certain zeolites which have been calcined at a high temperature of at least 649.degree. C. (i.e., 1200.degree. F.). These zeolites have a silica/alumina ratio of at least about 12 and a constraint index within the approximate range of 1 to 12. Examples of such zeolites include ZSM-5 and ZSM-11.Type: GrantFiled: August 18, 1989Date of Patent: July 23, 1991Assignee: Mobil Oil CorporationInventors: Pochen Chu, Francis G. Dwyer, Albert B. Schwartz
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Patent number: 5030337Abstract: There is provided an aluminum-containing aluminosilicate zeolite corresponding to the substantially aluminum free silicate zeolite described in the Hinnenkamp et al U.S. Pat. No. 4,376,757. Also provided are methods for making this aluminosilicate zeolite and methods for the catalytic conversion of organic charges to desired products with this aluminosilicate zeolite.Type: GrantFiled: November 16, 1990Date of Patent: July 9, 1991Assignee: Mobil Oil CorporationInventors: Pochen Chu, Joseph A. Herbst, Donald J. Klocke, James Vartuli
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Patent number: 5026943Abstract: This invention relates to catalytic conversion of organic compounds over MCM-35, a new crystalline material exhibiting a distinctive X-ray diffraction pattern. The conversion process includes the mechanisms of cracking, hydrocracking, dewaxing, dehydrogenation and aromatic alkylation.Type: GrantFiled: September 25, 1990Date of Patent: June 25, 1991Assignee: Mobil Oil CorpInventors: Mae K. Rubin, Pochen Chu
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Patent number: 5008481Abstract: There is provided a process for the aromatization of non-aromatic hydrocarbons having at least six carbon atoms. The non-aromatic feed is contacted with a catalyst which includes a base metal or noble metal which is incorporated into or onto a pillared layered silicate. A preferred pillared layered silicate is kenyaite containing interspathic silica, and a preferred base metal or noble metal is chromium.Type: GrantFiled: December 29, 1989Date of Patent: April 16, 1991Assignee: Mobil Oil CorporationInventors: Ivy D. Johnson, Pochen Chu, Charles T. Kresge
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Patent number: 5001096Abstract: The invention describes the preparation of novel cracking catalysts by surface coating conventional cracking catalysts with passivators that act as metals traps. The coating of passivators is weakly bound to the catalyst so as to permit the coating to continuously attrit off during catalytic cracking. The continuous flaking off of the coating exposes a new surface of the coating.Type: GrantFiled: April 7, 1989Date of Patent: March 19, 1991Assignee: Mobil Oil CorporationInventors: Pochen Chu, Albin Huss, Jr., Garry W. Kirker
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Patent number: 4985223Abstract: There is provided an aluminum-containing aluminosilicate zeolite corresponding to the substantially aluminum free silicate zeolite described in the Hinnenkamp et al U.S. Pat. No. 4,376,757. Also provided are methods for making this aluminosilicate zeolite and methods for the catalytic conversion of organic charges to desired products with this aluminosilicate zeolite.Type: GrantFiled: September 17, 1984Date of Patent: January 15, 1991Assignee: Mobil Oil CorporationInventors: Pochen Chu, Joseph A. Herbst, Donald J. Klocke, James Vartuli
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Patent number: 4968652Abstract: Pillared layered silicate compositions containing pillars of silica and metal oxides, e.g., alumina are prepared by contacting organic-swelled layered silicates, e.g. kenyaite-type materials, with a hydrolyzable silica precursor, e.g., tetraethylorthosilicate which forms silanol groups between the layers and contacting the resulting product with an aqueous solution containing inorganic metal salt and effecting hydrolysis of the silanol groups.Type: GrantFiled: March 9, 1990Date of Patent: November 6, 1990Assignee: Mobil Oil CorporationInventors: Ivy D. Johnson, Pochen Chu