Patents by Inventor Shyh-Yuan Hwang
Shyh-Yuan Hwang 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).
-
Patent number: 8445738Abstract: A process is described for producing cumene comprising contacting a feed stream comprising benzene and a further feed stream comprising isopropanol or a mixture of isopropanol and propylene in the presence of an alkylation catalyst comprising at least a molecular sieve of the MCM-22, family in an alkylation zone under alkylation conditions of at least partial liquid phase and with a water concentration in the liquid phase of at least 50 ppm to react at least part of said isopropanol and benzene to produce an effluent stream containing cumene.Type: GrantFiled: September 23, 2009Date of Patent: May 21, 2013Assignee: Badger Licensing LLCInventors: Shyh-Yuan Hwang, Dana E. Johnson, Joseph C. Peters, Chung-Ming Chi, Kevin J. Fallon, Francis A. Demers
-
Publication number: 20100268008Abstract: Improved integrated processes for the production of alkyl aromatic compounds are disclosed wherein aromatic compounds which may be treated for removal of deleterious substances are reacted with olefin compounds, which may also be treated for contaminant removal, in the presence of acidic zeolite catalyst(s) to produce the desired alkyl aromatic compound(s). The aromatic and preferably also the olefin feeds are treated substantially to remove contaminants, particularly the nitrogen compounds contained therein, before they are brought together for reaction in the presence of the zeolite catalyst(s). In accordance with the present invention, it has been found that feed pretreatment for removal of nitrogen compounds significantly improves the run length and life of the acidic zeolite catalyst(s). The feed pretreatment of this invention may include the steps of distillation, extraction, and/or adsorption by solid adsorbent, which may be regenerated in accordance with further embodiments of this invention.Type: ApplicationFiled: July 6, 2010Publication date: October 21, 2010Inventors: Shyh-Yuan Hwang, Maruti Bhandarkar, Chung-Ming Chi, Waheed Mukaddam, Frank Demers, Richard F. Guarino, Dana E. Johnson
-
Patent number: 7777086Abstract: Improved integrated processes for the production of alkyl aromatic compounds are disclosed wherein aromatic compounds which may be treated for removal of deleterious substances are reacted with olefin compounds, which may also be treated for contaminant removal, in the presence of acidic zeolite catalyst(s) to produce the desired alkyl aromatic compound(s). The aromatic and preferably also the olefin feeds are treated substantially to remove contaminants, particularly the nitrogen compounds contained therein, before they are brought together for reaction in the presence of the zeolite catalyst(s). In accordance with the present invention, it has been found that feed pretreatment for removal of nitrogen compounds significantly improves the run length and life of the acidic zeolite catalyst(s). The feed pretreatment of this invention may include the steps of distillation, extraction, and/or adsorption by solid adsorbent, which may be regenerated in accordance with further embodiments of this invention.Type: GrantFiled: February 27, 2003Date of Patent: August 17, 2010Assignee: Stone & Webster, Inc.Inventors: Shyh-Yuan Hwang, Maruti Bhandarkar, Chung-Ming Chi, Waheed Mukaddam, Frank Demers, Richard F. Guarino, Dana E Johnson
-
Publication number: 20050143612Abstract: Improved integrated processes for the production of alkyl aromatic compounds are disclosed wherein aromatic compounds which may be treated for removal of deleterious substances are reacted with olefin compounds, which may also be treated for contaminant removal, in the presence of acidic zeolite catalyst(s) to produce the desired alkyl aromatic compound(s). The aromatic and preferably also the olefin feeds are treated substantially to remove contaminants, particularly the nitrogen compounds contained therein, before they are brought together for reaction in the presence of the zeolite catalyst(s). In accordance with the present invention, it has been found that feed pretreatment for removal of nitrogen compounds significantly improves the run length and life of the acidic zeolite catalyst(s). The feed pretreatment of this invention may include the steps of distillation, extraction, and/or adsorption by solid adsorbent, which may be regenerated in accordance with further embodiments of this invention.Type: ApplicationFiled: February 27, 2003Publication date: June 30, 2005Inventors: Shyh-Yuan Hwang, Maruti Bhandarkar, Chung-Ming Chi, Waheed Mukaddam, Frank Demers, Richard Guarino, Dana Johnson
-
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
-
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
-
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
-
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