Patents by Inventor Shun C. Fung
Shun C. Fung 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: 7355086Abstract: A method for maintaining the activity of silicoaluminophosphate (SAPO) molecular sieve catalyst particles during oxygenate to olefin conversion reactions. After regeneration of SAPO catalyst particles, the regenerated particles are mixed with particles having coke on their surface in a manner that maintains their catalytic activity at a predetermined level.Type: GrantFiled: February 27, 2006Date of Patent: April 8, 2008Assignee: ExxonMobil Chemical Patents Inc.Inventors: Shun C. Fung, Richard B. Hall, Hafedh Kochkar, Karl G. Strohmaier, Nicolas P. Coute, Kenneth R. Clem
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Patent number: 7345213Abstract: This invention is directed to a method of making an olefin product from an oxygenate feedstock and a method of protecting catalytic activity of a silicoaluminophosphate molecular sieve. The methods comprise providing a silicoaluminophosphate molecular sieve having catalytic sites within the molecular sieve; shielding the catalytic sites to protect from loss of catalytic activity; and contacting the protected sieve in its activated state with an oxygenate feedstock under conditions effective to produce an olefin product before undesirable loss of catalytic activity. Undesirable loss in catalytic activity occurs when activated molecular sieve contacting the oxygenate feedstock has a methanol uptake index of at least 0.15.Type: GrantFiled: July 9, 2003Date of Patent: March 18, 2008Assignee: ExxonMobil Chemical Patents Inc.Inventors: Marcel J. G. Janssen, Cornelius W. M. Van Oorschot, Shun C. Fung, Luc R. M. Martens, Wilfried J. Mortier, Ronald G. Searle, Machteld M. Mertens, Stephen N. Vaughn
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Patent number: 7033971Abstract: A method for maintaining the activity of silicoaluminophosphate (SAPO) molecular sieve catalyst particles during oxygenate to olefin conversion reactions. After regeneration of SAPO catalyst particles, the regenerated particles are mixed with particles having coke on their surface in a manner that maintains their catalytic activity at a predetermined level.Type: GrantFiled: February 9, 2004Date of Patent: April 25, 2006Assignee: ExxonMobil Chemical Patents Inc.Inventors: Shun C. Fung, Richard B. Hall, Hafedh Kochkar, Karl G. Strohmaier, Nicolas P. Coute, Kenneth R. Clem
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Patent number: 6979756Abstract: Disclosed is a method of heat treating a molecular sieve. The method comprises providing a template-containing molecular sieve, heating the molecular sieve under conditions effective to remove a portion of the template from the molecular sieve, and cooling the heated molecular sieve to leave an amount of template effective to cover catalytic sites within the molecular sieve. A catalyst composition is also provided which comprises a molecular sieve having a microporous structure and a binder, wherein between 10 and 90 vol % of the microporous structure is occupied by a material, the material comprising a template or a carbonaceous residue of a template, and the catalyst composition exhibits a Davison Index of not greater than 30.Type: GrantFiled: October 28, 2002Date of Patent: December 27, 2005Assignee: ExxonMobil Chemical Patents Inc.Inventors: Shun C. Fung, Marcel J. G. Janssen, Stephen N. Vaughn, Machteld M. Mertens, Albert Edward Schweizer, Cornelius W. M. Van Oorschot, Luc R. M. Martens, Richard B. Hall, Wilfried J. Mortier, Ronald G. Searle, Yi-Gang Xiong
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Patent number: 6803494Abstract: A process for producing polypropylene from olefins selectively produced from a catalytically cracked or thermally cracked naphtha stream is disclosed herein. The naphtha stream is contacted with a catalyst containing from about 10 to 50 wt. % of a crystalline zeolite having an average pore diameter less than about 0.7 nanometers at reaction conditions which include temperatures from about 500° C. to 650° C. and a hydrocarbon partial pressure from about 10 to 40 psia. The catalyst may be pre-coked with a carbonaceous feed. Alternatively, the carbonaceous feed used to coke the catalyst may be co-fed with the naphtha feed.Type: GrantFiled: May 19, 2000Date of Patent: October 12, 2004Assignee: ExxonMobil Chemical Patents Inc.Inventors: Paul K. Ladwig, John E. Asplin, Gordon F. Stuntz, William A. Wachter, Brian Erik Henry, Shun C. Fung
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Patent number: 6797852Abstract: This invention is directed to a method of making an olefin product from an oxygenate feedstock and a method of protecting catalytic activity of a silicoaluminophosphate molecular sieve. The methods comprise providing a silicoaluminophosphate molecular sieve having catalytic sites within the molecular sieve; shielding the catalytic sites to protect from loss of catalytic activity; and contacting the protected sieve in its activated state with an oxygenate feedstock under conditions effective to produce an olefin product before undesirable loss of catalytic activity. Undesirable loss in catalytic activity occurs when activated molecular sieve contacting the oxygenate feedstock has a methanol uptake index of at least 0.15.Type: GrantFiled: July 26, 2002Date of Patent: September 28, 2004Assignee: ExxonMobil Chemical Patents Inc.Inventors: Marcel J. G. Janssen, Cornelius W. M. Van Oorschot, Shun C. Fung, Luc R. M. Martens, Wilfried J. Mortier, Ronald G. Searle, Machteld M. Mertens, Stephen N. Vaughn
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Patent number: 6768034Abstract: Disclosed is a catalytic method for operating an oxygenate to olefins conversion reaction to provide a substantial quantity of prime olefin in the product. The product is provided by operating within desired parameters of weight hourly space velocity and oxygenate partial pressure. Operating the reaction to supply oxygenate at an oxygenate proportion index of at least 0.5, and controlling weight hourly space velocity and molar flow rate of oxygenate to the reactor to maintain a partial pressure-velocity compensation factor of at least 0.1 psia−1hr−1, a prime olefin selectivity of at least 45 wt. % can be maintained.Type: GrantFiled: January 9, 2003Date of Patent: July 27, 2004Assignee: ExxonMobil Chemical Patents Inc.Inventors: Shun C. Fung, Keith H. Kuechler, Jeffrey S. Smith, Nicolas P. Coute, Stephen N. Vaughn, Chunshe Cao
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Patent number: 6740790Abstract: Disclosed is a method for making olefin product from an oxygenate-containing feedstock. In the method, a silicoaluminophosphate molecular sieve catalyst is contacted with the oxygenate-containing feedstock in a reactor at an average catalyst feedstock exposure index of at least 1.0. The method produces lower coke yield and provides an olefin product which is low in C1-C4 paraffin content. The invention is particularly effective in producing an olefin product having a very low propane content.Type: GrantFiled: May 14, 2002Date of Patent: May 25, 2004Assignee: ExxonMobil Chemical Patents Inc.Inventors: Keith H. Kuechler, Marcel J. G. Janssen, Stephen N. Vaughn, Shun C. Fung, Nicolas P. Coute, Jeffrey Scott Smith, James R. Lattner, Jeffrey L. White, Teng Xu, William L. Kuechler, Sr., Machteld M. Mertens, Cornelius W. M. Van Oorschot
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Publication number: 20040034178Abstract: A process for method for the production of olefin product from an oxygenate-containing feedstock includes exposing a silicoaluminophosphate catalyst to an oxygenate-containing feedstock in a reaction zone under conditions effective to convert the oxygenate-containing feedstock to an olefin product, by stripping at least a portion of the exposed catalyst with a stripping gas; and returning at least a portion of the stripped catalyst directly to the reaction zone.Type: ApplicationFiled: August 14, 2003Publication date: February 19, 2004Inventors: Stephen N. Vaughn, Luc R.M. Martens, Shun C. Fung, David C. Skouby
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Publication number: 20040015030Abstract: This invention is directed to a method of making an olefin product from an oxygenate feedstock and a method of protecting catalytic activity of a silicoaluminophosphate molecular sieve. The methods comprise providing a silicoaluminophosphate molecular sieve having catalytic sites within the molecular sieve; shielding the catalytic sites to protect from loss of catalytic activity; and contacting the protected sieve in its activated state with an oxygenate feedstock under conditions effective to produce an olefin product before undesirable loss of catalytic activity. Undesirable loss in catalytic activity occurs when activated molecular sieve contacting the oxygenate feedstock has a methanol uptake index of at least 0.15.Type: ApplicationFiled: July 9, 2003Publication date: January 22, 2004Inventors: Marcel J.G. Janssen, Cornelius W.M. Van Oorschot, Shun C. Fung, Luc R.M. Martens, Wilfried J. Mortier, Ronald G. Searle, Machteld M. Mertens, Stephen N. Vaughn
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Patent number: 6613950Abstract: A process for method for the production of olefin product from an oxygenate-containing feedstock includes exposing a silicoaluminophosphate catalyst to an oxygenate-containing feedstock in a reaction zone under conditions effective to convert the oxygenate-containing feedstock to an olefin product, by stripping at least a portion of the exposed catalyst with a stripping gas; and returning at least a portion of the stripped catalyst directly to the reaction zone.Type: GrantFiled: June 6, 2000Date of Patent: September 2, 2003Assignee: ExxonMobil Chemical Patents Inc.Inventors: Stephen N. Vaughn, Luc R. M. Martens, Shun C. Fung, David C. Skouby
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Publication number: 20030109765Abstract: Disclosed is a catalytic method for operating an oxygenate to olefins conversion reaction to provide a substantial quantity of prime olefin in the product. The product is provided by operating within desired parameters of weight hourly space velocity and oxygenate partial pressure. Operating the reaction to supply oxygenate at an oxygenate proportion index of at least 0.5, and controlling weight hourly space velocity and molar flow rate of oxygenate to the reactor to maintain a partial pressure-velocity compensation factor of at least 0.1 psia−1hr−1, a prime olefin selectivity of at least 45 wt. % can be maintained.Type: ApplicationFiled: January 9, 2003Publication date: June 12, 2003Inventors: Shun C. Fung, Keith H. Kuechler, Jeffrey S. Smith, Nicolas P. Coute, Stephen N. Vaughn, Chunshe Cao
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Publication number: 20030055304Abstract: Disclosed is a method of heat treating a molecular sieve. The method comprises providing a template-containing molecular sieve, heating the molecular sieve under conditions effective to remove a portion of the template from the molecular sieve, and cooling the heated molecular sieve to leave an amount of template effective to cover catalytic sites within the molecular sieve. A catalyst composition is, also provided which comprises a molecular sieve having a microporous structure and a binder, wherein between 10 and 90 vol % of the microporous structure is occupied by a material, the material comprising a template or a carbonaceous residue of a template, and the catalyst composition exhibits a Davison Index of not greater than 30.Type: ApplicationFiled: October 28, 2002Publication date: March 20, 2003Inventors: Shun C. Fung, Marcel J.G. Janssen, Stephen N. Vaughn, Machteld M. Mertens, Albert Edward Schweizer, Cornelius W.M. Van Oorschot, Luc R.M. Martens, Richard B. Hall, Wilfried J. Mortier, Ronald G. Searle, Yi-Gang Xiong
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Patent number: 6531639Abstract: Disclosed is a catalytic method for operating an oxygenate to olefins conversion reaction to provide a substantial quantity of prime olefin in the product. The product is provided by operating within desired parameters of weight hourly space velocity and oxygenate partial pressure. Operating the reaction to supply oxygenate at an oxygenate proportion index of at least 0.5, and controlling weight hourly space velocity and molar flow rate of oxygenate to the reactor to maintain a partial pressure-velocity compensation factor of at least 0.1 psia−1hr−1, a prime olefin selectivity of at least 45 wt. % can be maintained.Type: GrantFiled: February 18, 2000Date of Patent: March 11, 2003Assignee: ExxonMobil Chemical Patents, Inc.Inventors: Shun C. Fung, Keith H. Kuechler, Jeffrey S. Smith, Nicolas P. Coute, Stephen N. Vaughn, Chunshe Cao
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Patent number: 6518475Abstract: A process for increasing the ethylene selectivity of a silicoaluminophosphate molecular sieve catalyst by using acetone in an oxygenate conversion process. Acetone can be added with the oxygenate feed at a concentration from about 1% to about 15% by weight, preferably about 1% to about 8% by weight, more preferably about 2% to about 5% by weight. Alternatively, acetone can be added as a pre-feed to the molecular sieve catalyst, particularly regenerated and fresh catalyst, in an contact zone. The pre-feed contacted catalyst is then directed to an oxygenate conversion zone. The acetone concentration in the pre-feed is from about 1% to about 99% by weight, preferably about 30% to about 70% by weight.Type: GrantFiled: February 16, 2001Date of Patent: February 11, 2003Assignee: ExxonMobil Chemical Patents Inc.Inventors: Shun C. Fung, Chunshe Cao, Teng Xu
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Patent number: 6503863Abstract: Disclosed is a method of heat treating a molecular sieve. The method comprises providing a template-containing molecular sieve, heating the molecular sieve under conditions effective to remove a portion of the template from the molecular sieve, and cooling the heated molecular sieve to leave an amount of template effective to cover catalytic sites within the molecular sieve. A catalyst composition is also provided which comprises a molecular sieve having a microporous structure and a binder, wherein between 10 and 90 vol % of the microporous structure is occupied by a material, the material comprising a template or a carbonaceous residue of a template, and the catalyst composition exhibits a Davison Index of not greater than 30.Type: GrantFiled: August 15, 2001Date of Patent: January 7, 2003Assignee: ExxonMobil Chemical Patents, Inc.Inventors: Shun C. Fung, Marcel J. G. Janssen, Stephen N. Vaughn, Machteld M. Mertens, Albert Edward Schweizer, Luc R. M. Martens, Richard B. Hall, Wilfried J. Mortier, Ronald G. Searle, Yi-Gang Xiong
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Publication number: 20020198427Abstract: This invention is directed to a method of making an olefin product from an oxygenate feedstock and a method of protecting catalytic activity of a silicoaluminophosphate molecular sieve. The methods comprise providing a silicoaluminophosphate molecular sieve having catalytic sites within the molecular sieve; shielding the catalytic sites to protect from loss of catalytic activity; and contacting the protected sieve in its activated state with an oxygenate feedstock under conditions effective to produce an olefin product before undesirable loss of catalytic activity. Undesirable loss in catalytic activity occurs when activated molecular sieve contacting the oxygenate feedstock has a methanol uptake index of at least 0.15.Type: ApplicationFiled: July 26, 2002Publication date: December 26, 2002Inventors: Marcel J.G. Janssen, Cornelius W.M. Van Oorschot, Shun C. Fung, Luc R.M. Martens, Wilfried J. Mortier, Ronald G. Searle, Machteld M. Mertens, Stephen N. Vaughn
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Patent number: 6482999Abstract: A method for converting oxygenates to light olefins.Type: GrantFiled: February 17, 1999Date of Patent: November 19, 2002Assignee: ExxonMobil Chemical Patents, Inc.Inventors: Shun C. Fung, James R. Lattner, Stephen N. Vaughn, Richard B. Hall, Hsiang-Ning Sun, Ron G. Searle, Luc R. M. Martens
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Publication number: 20020169349Abstract: Disclosed is a method for making olefin product from an oxygenate-containing feedstock. In the method, a silicoaluminophosphate molecular sieve catalyst is contacted with the oxygenate-containing feedstock in a reactor at an average catalyst feedstock exposure index of at least 1.0. The method produces lower coke yield and provides an olefin product which is low in C1-C4 paraffin content. The invention is particularly effective in producing an olefin product having a very low propane content.Type: ApplicationFiled: May 14, 2002Publication date: November 14, 2002Inventors: Keith H. Kuechler, Marcel J.G. Janssen, Stephen N. Vaughn, Shun C. Fung, Nicolas P. Coute, Jeffrey Scott Smith, James R. Lattner, Jeffrey L. White, Teng Xu, William L. Kuechler, Machteld M. Mertens, Cornelius W.M. Van Oorschot
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Publication number: 20020165089Abstract: The present invention relates to a silicoaluminophosphate molecular sieve comprising at least one intergrown phase of molecular sieves having AEI and CHA framework types, wherein said intergrown phase has an AEI/CHA ratio of from about 5/95 to 40/60 as determined by DIFFaX analysis, using the powder X-ray diffraction pattern of a calcined sample of said silicoaluminophosphate molecular sieve. It also relates to methods for its preparation and to its use in the catalytic conversion of methanol to olefins.Type: ApplicationFiled: August 7, 2001Publication date: November 7, 2002Inventors: Marcel J.G. Janssen, Shun C. Fung, An A. Verberckmoes, Machteld M. Mertens, Wilfried J. Mortier