Patents by Inventor Shiou-Shan Chen
Shiou-Shan 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: 7923590Abstract: A process for producing a monoalkylation aromatic product, such as ethylbenzene and cumene, utilizing an alkylation reactor zone and a transalkylation zone in series or a combined alkylation and transalkylation reactor zone. This process requires significantly less total aromatics distillation and recycle as compared to the prior art.Type: GrantFiled: June 27, 2008Date of Patent: April 12, 2011Assignees: ExxonMobil Chemical Patents Inc, Stone & Webster, Inc.Inventors: Shiou-Shan Chen, Shyh-Yuan H. Hwang
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Publication number: 20080262279Abstract: A process for producing a monoalkylation aromatic product, such as ethylbenzene and cumene, utilizing an alkylation reactor zone and a transalkylation zone in series or a combined alkylation and transalkylation reactor zone. This process requires significantly less total aromatics distillation and recycle as compared to the prior art.Type: ApplicationFiled: June 27, 2008Publication date: October 23, 2008Inventors: Shiou-Shan Chen, Shyh-Yuan H. Hwang
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Patent number: 7411101Abstract: A process for producing a monoalkylation aromatic product, such as ethylbenzene and cumene, utilizing an alkylation reactor zone and a transalkylation zone in series or a combined alkylation and transkylation reactor zone.Type: GrantFiled: February 6, 2002Date of Patent: August 12, 2008Assignee: ExxonMobil Chemical Patents Inc.Inventors: Shiou-Shan Chen, Henry Hwang
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Publication number: 20040220438Abstract: A process for producing a monoalkylation aromatic product, such as ethylbenzene and cumene, utilizing an alkylation reactor zone and a transalkylation zone in series or a combined alkylation and transkylation reactor zone.Type: ApplicationFiled: July 17, 2003Publication date: November 4, 2004Inventors: Shiou-Shan Chen, Shy-Yuan H. Hwang
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Publication number: 20040030211Abstract: A process for preparing a mixed dialkylbenzene product is disclosed in which a predominant proportion above 60 wt. % of the meta-dialkylbenzene isomer and a very low proportion of the ortho-dialkylbenzene isomer is produced by a liquid-phase alkylation of a suitable olefin and aromatic feed, utilizing an alkylation catalyst selected for enhancement of meta-isomer formation followed by or carried out in combination with a meta-isomer enhancement utilizing a catalyst selected for enhancement of meta-isomer formation.Type: ApplicationFiled: February 28, 2003Publication date: February 12, 2004Inventors: Chung-Ming Chi, Shiou-Shan Chen
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Patent number: 5739071Abstract: A method and apparatus are disclosed for regenerating and/or stabilizing the activity of a dehydrogenation catalyst used in dehydrogenating an alkylaromatic hydrocarbon to obtain an alkenylaromatic hydrocarbon, the method comprising the steps of continuously or intermittently adding to a reactant stream an effective amount of an alkali metal or alkali metal compound without interrupting the dehydrogenation reaction.Type: GrantFiled: March 18, 1996Date of Patent: April 14, 1998Assignee: Raytheon Engineers & Constructors, Inc.Inventors: Shiou-Shan Chen, Shyh-Yuan Hwang, Slawomir A. Oleksy, Sanjeev Ram, Joseph C. Peters
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Patent number: 5695724Abstract: A method and associated apparatus for regenerating and/or stabilizing catalyst used in dehydrogenation of alkylaromatic hydrocarbons is disclosed. The alkylaromatic hydrocarbon (1) and steam (2) are combined to form feedstream (3) and pass into reactor (50). The ensuing product stream (4) is reheated in heater (52) to restore the heat lost and passed as partially converted reactant stream (5) into second reactor (54) and leaves as stream (6) comprising the dehydrogen product. Restoration and/or stabilization of catalyst is accomplished by an alkali metal compound which is fed into feedstream (2) and/or product stream (5) via supply means (46 and 66), respectively. The amount of alkali metal compound entering the reactor(s) is monitored by means (42 and 62) which may in turn be coupled to activating means (44 and 64) to signal and activate the supply means. This method and apparatus permit the restoration and/or stabilization of the catalyst to be performed without interrupting the dehydrogenation reaction.Type: GrantFiled: December 5, 1995Date of Patent: December 9, 1997Assignee: Raytheon Engineers & Constructors, Inc.Inventors: Shiou-Shan Chen, Shyh-Yuan Hwang, Slawomir A. Oleksy, Sanjeev Ram
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Patent number: 5686369Abstract: A method and apparatus are disclosed for regenerating and/or stabilizing the activity of a dehydrogenation catalyst used in dehydrogenating an alkylaromatic hydrocarbon to obtain an alkenylaromatic hydrocarbon, the method comprising the steps of continuously or intermittently adding to a reactant stream an effective amount of an alkali metal compound without interrupting the dehydrogenation reaction.Type: GrantFiled: June 6, 1995Date of Patent: November 11, 1997Assignee: Raytheon Engineers & Constructors, Inc.Inventors: Shiou-Shan Chen, Shyh-Yuan Hwang, Slawomir A. Oleksy, Sanjeev Ram
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Patent number: 5679878Abstract: This invention relates to a vapor phase process for the production of an alkyl styrene by the catalytic dehydrogenation of tertiary butylethylbenzene in the presence of catalysts containing iron oxides under conditions which minimize the undesirable thermal degradation of the raw material and the product while maintaining good yield and selectivity with low production of by-products. Specifically, it has been discovered that these desired results may be obtained by conducting the subject reaction at relatively low temperatures of between about 1000.degree. F. and about 1100.degree. F. and by maintaining a low partial pressure (i.e., not greater than about 0.5 psi) of the alkyl ethylbenzene in the reaction mixture. The desired partial pressure of the alkyl ethylbenzene is obtained by carrying out the catalytic reaction at a pressure of between about 1 psia and about 30 psia with steam as a diluent, the weight ratio of steam to alkyl ethylbenzene being between about 3 and about 30.Type: GrantFiled: October 28, 1992Date of Patent: October 21, 1997Assignee: Deltech CorporationInventors: Shiou-Shan Chen, Joseph C. Peters, Lionel C. Allmand
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Patent number: 5461179Abstract: A method and apparatus are disclosed for regenerating and/or stabilizing the activity of a dehydrogenation catalyst used in dehydrogenating an alkylaromatic hydrocarbon to obtain an alkenylaromatic hydrocarbon, the method comprising the steps of continuously or intermittently adding to a reactant stream an effective amount of an alkali metal compound without interrupting the dehydrogenation reaction.Type: GrantFiled: July 7, 1993Date of Patent: October 24, 1995Assignee: Raytheon Engineers & Constructors, Inc.Inventors: Shiou-Shan Chen, Shyh-Yuan Hwang, Slawomir A. Oleksy, Sanjeev Ram
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Patent number: 5434325Abstract: The present invention provides an alkylation process which is highly selective towards the production of para-tertiarybutylethylbenzene in high yield and in high para isomer content, while minimizing the development of unwanted by-products and impurities during the alkylation reaction. In accordance with the process, a feed stream mixture comprising the olefin alkylating agent and a molar excess of an aromatic hydrocarbon substrate is introduced into the inlet of a reactor zone and through a bed of active zeolite alkylation catalyst under alkylation conditions such that substantially all of the olefin reacts with the aromatic substrate to produce a mixture comprising the alkylated product and unreacted aromatic compound. This mixture is continuously withdrawn from the reactor zone as reactor effluent, after which the effluent is split into a product stream and recycle stream.Type: GrantFiled: July 20, 1994Date of Patent: July 18, 1995Assignee: Deltech CorporationInventors: Shiou-Shan Chen, Joseph C. Peters
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Patent number: 5196632Abstract: The invention provides a method of extending the useful life of high temperature heat exchangers, e.g., reactor feed/effluent heat exchangers, in installations where the heat exchanger is contacted by a process fluid stream, e.g., a feedstock comprising ethylbenzene at a temperature where the process stream may cause deterioration of contacted metal surfaces of the heat exchanger and/or undergo catalytic reaction as a result of contact with the contacted metal surfaces. The new method comprises the step of mechanically removing material from those surfaces of the heat exchanger that are to be contacted by the process fluid stream, so as to render said surfaces less susceptible to attack from said high temperature process fluid stream.Type: GrantFiled: June 11, 1992Date of Patent: March 23, 1993Assignee: The Badger Company, Inc.Inventors: Thomas L. Larsen, Max E. Underwood, Maarten P. Noordzij, Shiou-Shan Chen
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Patent number: 5141049Abstract: The invention provides a method of extending the useful life of high temperature heat exchangers, e.g., reactor feed/effluent heat exchangers, in installations where the heat exchanger is contacted by a process fluid stream, e.g., a feedstock comprising ethylbenzene, at a temperature where the process stream may cause deterioration of contacted metal surfaces of the heat exchanger and/or undergo catalytic reaction as a result of contact with the contacted metal surfaces. The new method comprises the step of mechanically removing material from those surfaces of the heat exchanger that are to be contacted by the process fluid stream, so as to render said surfaces less susceptible to attack from said high temperature process fluid stream.Type: GrantFiled: August 9, 1990Date of Patent: August 25, 1992Assignee: The Badger Company, Inc.Inventors: Thomas L. Larsen, Max E. Underwood, Maarten P. Noordzij, Shiou-Shan Chen