Patents by Inventor Nai Yuen Chen
Nai Yuen Chen 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: 6416654Abstract: Nitrogenous compounds especially bases such as ammonia vapor are used to control the operation of a hydrocracker or catalytic dewaxer. Catalyst activity and selectivity may be controlled by addition of the base to the feed, for example, to control the balance between isomerization and hydrocracking in an operation using a zeolite beta catalyst. Runaway conditions may be controlled by the addition of nitrogenous compounds to regulate the temperature profile within the reactor.Type: GrantFiled: December 30, 1994Date of Patent: July 9, 2002Assignee: Mobil Oil CorporationInventors: Tai-Sheng Chou, Nai Yuen Chen, Grant G. Karsner, Clinton R. Kennedy, Rene B. LaPierre, Melcon G. Melconian, Richard J. Quann, Stephen S. Wong
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Patent number: 5100535Abstract: Nitrogenous compounds especially bases such as amines are used to control the operation of a hydrocracker. Catalyst activity and selectivity may be controlled by addition of the base to the feed, for example, to control the balance between isomerization and conversion in an operation using a zeolite beta catalyst. Runaway conditions may be controlled by the addition of nitrogenous compounds and if they are added at intermediate points along the length of the reactor, the temperature profile within the reactor can be effectively regulated.Type: GrantFiled: December 5, 1988Date of Patent: March 31, 1992Assignee: Mobil Oil CorporationInventors: Nai Yuen Chen, Tai-Sheng Chou, Grant G. Karsner, Clinton R. Kennedy, Rene B. LaPierre, Melcon G. Melconian, Richard J. Quann, Stephen S. Wong
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Patent number: 4862836Abstract: A method is provided of operating an internal combustion engine comprising subjecting a hydrocarbon fuel of relatively low octane number to conversion at elevated temperatures by passing it through a reaction zone containing a fuel system of unidirectional, e.g., substantially parallel, channels with rigid walls, e.g., a monolith or series of monoliths, at least the internal surfaces of which contain an aluminosilicate zeolite catalyst having a Constraint Index in the approximate range of about 1 to 12 and a silica/alumina ratio in a range of about 20 to 5000, e.g., ZSM-5 preferably containing gallium or zinc, such that the fuel leaving said channels has an increased octane number, and passing the fuel to the combustion chamber of said engine.Type: GrantFiled: December 15, 1987Date of Patent: September 5, 1989Assignee: Mobil Oil CorporationInventors: Nai Yuen Chen, Thomas F. Degnan, Sr.
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Patent number: 4672049Abstract: This invention provides a novel hydrocracking catalyst composition that contains Zeolite Beta having a framework boron content, a solid source of alumina, and a hydrogenation component. It further provides a low-pressure hydrocracking process that uses such composition.Type: GrantFiled: March 5, 1986Date of Patent: June 9, 1987Assignee: Mobil Oil CorporationInventors: Nai Yuen Chen, Tracy J. Huang
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Patent number: 4311865Abstract: This invention provides a novel catalyst exemplified by cobalt-exchanged ZSM-5. The catalyst has unusual resistance to irreversible steam degradation. After long-term exposure to steam, it may be regenerated by sulfiding. The invention further provides a process for converting, in the presence of steam, compounds subject to catalytic conversion by acidic catalysts, including a process in which steam is inherently produced. The latter conversion is exemplified by the formation of higher carbon-numbered hydrocarbons from the lower alcohols or ethers thereof.Type: GrantFiled: February 19, 1980Date of Patent: January 19, 1982Assignee: Mobil Oil CorporationInventors: Nai-Yuen Chen, Joseph N. Miale, William J. Reagan
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Patent number: 4118431Abstract: A method and system is described for effecting chemical reactions of aliphatic hetero compounds to gasoline boiling components with crystalline zeolites in the presence of a relatively inert particle material arranged to exercise distribution of exothermic heat and utilized in a catalyst system under conditions to minimize undesired deactivation of catalyst particles.Type: GrantFiled: October 21, 1976Date of Patent: October 3, 1978Assignee: Mobil Oil CorporationInventor: Nai Yuen Chen
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Patent number: 4112056Abstract: An improved method is provided for preparing a crystalline aluminosilicate zeolite having a high silica/alumina mole ratio which comprises adding a source of aluminum ions to a silica-rich amorphous reaction medium at a rate whereby the concentration of aluminum ions in the amorphous phase of the preparation is maintained at steady state during crystallization. Crystallization time is substantially shortened by the present improved method and zeolites synthesized by way of the present improved method exhibit improved steam stability.Also provided are improved crystalline aluminosilicate zeolites prepared by way of the present improved method of synthesis and organic compound conversion therewith.Type: GrantFiled: May 2, 1977Date of Patent: September 5, 1978Assignee: Mobil Oil CorporationInventors: Nai Yuen Chen, Joseph Nicolas Miale, William Joseph Reagan
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Patent number: 4108730Abstract: A process for converting relatively ash-free solid polymeric wastes to more valuable liquid, solid, and gaseous products which comprises mixing rubber and/or plastic wastes at high temperatures in a refractory petroleum stream and catalytically cracking the mixture.Type: GrantFiled: March 14, 1977Date of Patent: August 22, 1978Assignee: Mobil Oil CorporationInventors: Nai Yuen Chen, Tsoung-Yuan Yan
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Patent number: 4100218Abstract: Ethane is converted to LPG and gasoline and/or aromatics concentrate in a combination process which comprises directly passing olefin effluent from the thermal cracking of ethane over a special crystalline aluminosilicate zeolite of the ZSM-5 type and recovering aromatics and C.sub.3 + hydrocarbons. For best yields, the thermal cracking step is conducted under more severe conditions than are used when ethylene production is optimized. The second, olefin conversion step is carried out at either the same pressure as the cracking step or higher. The process is of particular interest where low cost ethane is available.Type: GrantFiled: May 31, 1977Date of Patent: July 11, 1978Assignee: Mobil Oil CorporationInventors: Nai Yuen Chen, Werner O. Haag
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Patent number: 4070993Abstract: In pre-engine converters, a low octane fuel is contacted with a catalyst bed at high temperature cracking conditions to produce a gaseous product of substantially higher octane which is then fed, together with air, directly to an internal combustion engine. This improvement mixes oxygen with the fed fuel and uses a ZSM-5 zeolite alone or mixed with an oxidation catalyst for the conversion.Type: GrantFiled: January 10, 1977Date of Patent: January 31, 1978Assignee: Mobil Oil CorporationInventor: Nai Yuen Chen
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Patent number: 4067797Abstract: A hydrocarbon fuel oil composition comprising a blend of untreated low pour-point distillate oil and a higher pour-point catalytically hydrodewaxed distillate oil. The blend has an unexpectedly low pour point and cloud point. Dewaxing is effected with a ZSM-5 type catalyst.Type: GrantFiled: January 16, 1976Date of Patent: January 10, 1978Assignee: Mobil Oil CorporationInventors: Nai Yuen Chen, Bernard M. Gillespie, Henry R. Ireland, Thomas R. Stein
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Patent number: 4049735Abstract: The lower monohydric alcohols and their ethers, especially methanol and dimethyl ether, are converted to a hydrocarbon mixture mostly ethylene, propylene and mononuclear aromatics, by co-feeding elemental oxygen and said alcohol and/or ether to a catalytic reactor that contains as catalyst a composite of antimony oxide and a crystalline aluminosilicate zeolite such as ZSM-5. Co-feeding elemental oxygen effectively inhibits the elution of antimony from the catalytic reactor.Type: GrantFiled: December 9, 1976Date of Patent: September 20, 1977Assignee: Mobil Oil CorporationInventors: Nai Yuen Chen, William Joseph Reagan
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Patent number: 4046522Abstract: A pre-engine catalytic converter for use with fuels which are mixtures of hydrocarbons and oxygenated organic compounds, such as alcohols, ethers and ketones, convertible to carbon monoxide and H.sub.2. The converter comprises two catalyst beds arranged in series, the first containing a catalyst suitable for the decomposition of organic oxygenates to CO and H.sub.2 and the second containing a cracking catalyst of the ZSM-5 zeolite type to convert the liquid hydrocarbon fuel to gaseous hydrocarbon fuel. Energy is extracted from the engine exhaust by heat exchange and utilized to support the catalytic reactions whereby the heating value and the octane rating of the fuel are increased. The performance and fuel economy of the engine are substantially improved.Type: GrantFiled: June 25, 1976Date of Patent: September 6, 1977Assignee: Mobil Oil CorporationInventors: Nai Yuen Chen, Heinz Heinemann
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Patent number: 4002697Abstract: Process for the selective production of para-xylene by methylation of toluene in the presence of a catalyst comprising a crystalline aluminosilicate of average crystal size greater than 0.5 micron, which aluminosilicate has the structure of ZSM-5, ZSM-11 or ZSM-21.Type: GrantFiled: September 25, 1974Date of Patent: January 11, 1977Assignee: Mobil Oil CorporationInventor: Nai Yuen Chen
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Patent number: 3956102Abstract: A method for the operation of a hydrodewaxing unit wherein a petroleum distillate is separated into two streams, one having a pour point of above about 30.degree.F, and the other having a pour point of less than about 30.degree.F., the 30.degree.F plus pour point fraction is treated in a hydrodewaxing unit with a ZSM-5 type catalyst under hydroprocessing conditions while the 30.degree.F. minus pour point portion is untreated and combined with the hydrodewaxed product. The process yields a net production of hydrogen, and exhibits excellent catalyst aging characteristics.Type: GrantFiled: June 5, 1974Date of Patent: May 11, 1976Assignee: Mobil Oil CorporationInventors: Nai Yuen Chen, Bernard M. Gillespie, Henry R. Ireland, Thomas R. Stein
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Patent number: 3936353Abstract: Microbial conversion of agricultural carbohydrate materials to alcohols followed by direct conversion of the oxygenated microbial reaction product to a hydrocarbon product comprising a substantial highly aromatic fraction which is liquid at normal temperatures and pressures. This latter conversion is carried out in the effective presence of a high silica to alumina ratio zeolite like ZSM-5.Type: GrantFiled: December 20, 1974Date of Patent: February 3, 1976Assignee: Mobil Oil CorporationInventor: Nai Yuen Chen