Patents by Inventor Cong-Yan Chen

Cong-Yan 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).

  • Patent number: 7083766
    Abstract: The present invention relates to new molecular sieve SSZ-71 prepared using a N-benzyl-1,4-diazabicyclo[2.2.2]octane cation as a structure-directing agent, methods for synthesizing SSZ-71 and processes employing SSZ-71 in a catalyst.
    Type: Grant
    Filed: November 2, 2005
    Date of Patent: August 1, 2006
    Assignee: Chevron U.S.A. Inc.
    Inventors: Cong-Yan Chen, Allen W. Burton, Jr., Ann J. Liang
  • Patent number: 7083776
    Abstract: The present invention relates to new molecular sieve SSZ-71 prepared using a N-benzyl-1,4-diazabicyclo[2.2.2]octane cation as a structure-directing agent, methods for synthesizing SSZ-71 and processes employing SSZ-71 in a catalyst.
    Type: Grant
    Filed: November 2, 2005
    Date of Patent: August 1, 2006
    Assignee: Chevron U.S.A. Inc.
    Inventors: Cong-Yan Chen, Allen W. Burton, Jr., Ann J. Liang
  • Publication number: 20060140834
    Abstract: The present invention relates to new molecular sieve SSZ-71 prepared using a N-benzyl-1,4-diazabicyclo[2.2.2]octane cation as a structure-directing agent, methods for synthesizing SSZ-71 and processes employing SSZ-71 in a catalyst.
    Type: Application
    Filed: November 2, 2005
    Publication date: June 29, 2006
    Inventors: Cong-Yan Chen, Allen Burton, Ann Liang
  • Publication number: 20060140841
    Abstract: The present invention relates to new molecular sieve SSZ-71 prepared using a N-benzyl-1,4-diazabicyclo[2.2.2]octane cation as a structure-directing agent, methods for synthesizing SSZ-71 and processes employing SSZ-71 in a catalyst.
    Type: Application
    Filed: November 2, 2005
    Publication date: June 29, 2006
    Inventors: Cong-Yan Chen, Allen Burton, Ann Liang
  • Publication number: 20060138026
    Abstract: The present invention relates to new molecular sieve SSZ-71 prepared using a N-benzyl-1,4-diazabicyclo[2.2.2]octane cation as a structure-directing agent, methods for synthesizing SSZ-71 and processes employing SSZ-71 in a catalyst.
    Type: Application
    Filed: November 2, 2005
    Publication date: June 29, 2006
    Inventors: Cong-Yan Chen, Allen Burton, Ann Liang
  • Publication number: 20060142618
    Abstract: The present invention relates to new molecular sieve SSZ-71 prepared using a N-benzyl-1,4-diazabicyclo[2.2.2]octane cation as a structure-directing agent, methods for synthesizing SSZ-71 and processes employing SSZ-71 in a catalyst.
    Type: Application
    Filed: November 2, 2005
    Publication date: June 29, 2006
    Inventors: Cong-Yan Chen, Allen Burton, Ann Liang
  • Publication number: 20060142600
    Abstract: The present invention relates to new molecular sieve SSZ-71 prepared using a N-benzyl-1,4-diazabicyclo[2.2.2]octane cation as a structure-directing agent, methods for synthesizing SSZ-71 and processes employing SSZ-71 in a catalyst.
    Type: Application
    Filed: November 2, 2005
    Publication date: June 29, 2006
    Inventors: Cong-Yan Chen, Allen Burton, Ann Liang
  • Patent number: 6900365
    Abstract: A catalytic hydrodealkylation/reforming process which comprises contacting a heavy hydrocarbon feedstream under catalytic hydrodealkylation/reforming conditions with a composition comprising borosilicate molecular sieves having a pore size greater than about 5.0 Angstroms and a Constraint Index smaller than about 1.0; further containing a hydrogenation/dehydrogenation component; wherein at least a portion of the heavy hydrocarbon feedstream is converted to a product comprising benzene, toluene, xylenes and ethylbenzene.
    Type: Grant
    Filed: December 11, 2001
    Date of Patent: May 31, 2005
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Cong-Yan Chen, Stacey I. Zones, Andrew Rainis, Dennis J. O'Rear
  • Publication number: 20050039385
    Abstract: Olefins and alcohols present in Fischer-Tropsch light naphthas are converted to dialkyl ethers of the formula: R—O—R? where R and R? are each primarily non-tertiary alkyl groups of more than four carbon atoms, via hydration of the olefins to alcohols followed by dehydration of the alcohols. Ethers may also form by direct reaction of olefins and alcohols. The ethers are separated from the remaining paraffins in the naphtha by distillation and added in an amount of 1-25 wt. % to paraffinic mid-distillate fuel components obtained by hydrotreating a Fischer-Tropsch product. The properties of the distillate fuel components such as lubricity and seal swell are improved by the dialkyl ethers. The removal of olefins and alcohols from the naphthas reduces refining and lead to a more salable product.
    Type: Application
    Filed: September 13, 2004
    Publication date: February 24, 2005
    Applicant: Chevron U.S.A. Inc.
    Inventors: Dennis O'Rear, Thomas Harris, Cong-Yan Chen
  • Patent number: 6824574
    Abstract: Olefins and alcohols present in Fischer-Tropsch light naphthas are converted to dialkyl ethers of the formula: R—O—R′ where R and R′ are each primarily non-tertiary alkyl groups of more than four carbon atoms, via hydration of the olefins to alcohols followed by dehydration of the alcohols. Ethers may also form by direct reaction of olefins and alcohols. The ethers are separated from the remaining paraffins in the naphtha by distillation and added in an amount of 1-25 wt. % to paraffinic mid-distillate fuel components obtained by hydrotreating a Fischer-Tropsch product. The properties of the distillate fuel components such as lubricity and seal swell are improved by the dialkyl ethers. The removal of olefins and alcohols from the naphthas reduces refining and lead to a more salable product.
    Type: Grant
    Filed: October 9, 2002
    Date of Patent: November 30, 2004
    Assignee: Chevron U.S.A. Inc.
    Inventors: Dennis J. O'Rear, Thomas Van Harris, Cong-Yan Chen
  • Patent number: 6790433
    Abstract: The invention, in one embodiment, is a method for preparing crystalline zeolites by (a) contacting a calcined essentially aluminum free borosilicate zeolite with an aqueous acid solution, thereby producing an at least partially deboronated zeolite; (b) contacting said at least partially deboronated zeolite with a solution selected from the group consisting of an aqueous aluminum salt solution, thereby producing an aluminosilicate zeolite; an aqueous gallium salt solution, thereby producing a gallosilicate zeolite; an aqueous iron salt solution, thereby producing a ferrosilicate zeolite; and mixtures thereof; and (c) where the contacting in step (b) occurs at a pH of not greater than about 3.5.
    Type: Grant
    Filed: October 18, 2002
    Date of Patent: September 14, 2004
    Assignee: Chevron U.S.A. Inc.
    Inventors: Cong-Yan Chen, Stacey I. Zones
  • Publication number: 20040068923
    Abstract: Olefins and alcohols present in Fischer-Tropsch products are converted to primary and secondary alkyl alcohols having at least four carbons through acid catalyzed etherification and hydrolysis reactions. The alcohols are added to a highly isoparaffinic distillate fuel blend, improving the lubricity of the mixture, and forming a distillate fuel with improved lubricity.
    Type: Application
    Filed: October 9, 2002
    Publication date: April 15, 2004
    Inventors: Dennis J. O'Rear, Thomas Van Harris, Cong-Yan Chen
  • Publication number: 20040068924
    Abstract: Olefins and alcohols present in Fischer-Tropsch light naphthas are converted to dialkyl ethers of the formula: R—O—R′ where R and R′ are each primarily non-tertiary alkyl groups of more than four carbon atoms, via hydration of the olefins to alcohols followed by dehydration of the alcohols. Ethers may also form by direct reaction of olefins and alcohols. The ethers are separated from the remaining paraffins in the naphtha by distillation and added in an amount of 1-25 wt. % to paraffinic mid-distillate fuel components obtained by hydrotreating a Fischer-Tropsch product. The properties of the distillate fuel components such as lubricity and seal swell are improved by the dialkyl ethers. The removal of olefins and alcohols from the naphthas reduces refining and lead to a more salable product.
    Type: Application
    Filed: October 9, 2002
    Publication date: April 15, 2004
    Inventors: Dennis J. O'Rear, Thomas Van Harris, Cong-Yan Chen
  • Publication number: 20030166982
    Abstract: A Fischer-Tropsch C3-C4 olefin stream is treated to lower the oxygenate content to below 4000 ppm. Another Fischer-Tropsch fraction is hydrotreated and hydrocracked to provide an isobutane-containing stream. The treated C3-C4 olefin stream is reacted with the isobutane stream in an alkylation reactor to provide a highly branched, high octane isoparaffinic alkylate. The alkylate is useful as a blending component in motor gasoline.
    Type: Application
    Filed: January 31, 2002
    Publication date: September 4, 2003
    Inventors: Dennis J. O' Rear, Steven S. Mathur, Thomas Van Harris, Curtis L. Munson, Cong-Yan Chen
  • Publication number: 20030158456
    Abstract: A Fischer-Tropsch C3-C4 olefin stream is simultaneously dehydrated and isomerized to convert alcohols to olefins and 1-butenes to 2-butenes and thereby lower the oxygenate content. Another Fischer-Tropsch fraction is hydrotreated and hydrocracked to provide an isobutane stream. The treated C3-C4 olefin stream having an oxygenate content less than 4000 ppm, is reacted with the isobutane stream to provide a highly branched, high octane isoparaffinic alkylate. The alkylate is useful as a blending component in motor gasoline.
    Type: Application
    Filed: January 31, 2002
    Publication date: August 21, 2003
    Inventors: Dennis J. O'Rear, Steven S. Mathur, Thomas Van Harris, Curtis Munson, Cong-Yan Chen
  • Publication number: 20030133870
    Abstract: The invention, in one embodiment, is a method for preparing crystalline zeolites by (a) contacting a calcined essentially aluminum free borosilicate zeolite with an aqueous acid solution, thereby producing an at least partially deboronated zeolite; (b) contacting said at least partially deboronated zeolite with a solution selected from the group consisting of an aqueous aluminum salt solution, thereby producing an aluminosilicate zeolite; an aqueous gallium salt solution, thereby producing a gallosilicate zeolite; an aqueous iron salt solution, thereby producing a ferrosilicate zeolite; and mixtures thereof; and (c) where the contacting in step (b) occurs at a pH of not greater than about 3.5.
    Type: Application
    Filed: October 18, 2002
    Publication date: July 17, 2003
    Inventors: Cong-Yan Chen, Stacey I. Zones
  • Patent number: 6566569
    Abstract: A process for preparing a C4- product stream and a C6+ product stream is disclosed. The process involves contacting a C5 containing paraffinic feedstock with a catalyst that includes a hydrogenation/dehydrogenation catalyst and an olefin metathesis catalyst under conditions which dehydrogenate the paraffins to olefins. The olefins are then metathesized and rehydrogenated to provide a product stream. A C4- fraction and a C6+ fraction can each be isolated from the product stream. The C4- fraction can be used, for example, in an alkylation reaction to provide compounds useful in gasoline compositions. Unconverted C5 paraffins can be recycled. The C6+ fraction can be used, for example, as solvents. Alternatively, they can be isomerized to form gasoline additives, or can be converted to aromatic compounds via reforming, for example, using conventional reforming techniques, preferably using the AROMAX™ process or traditional rheniforming conditions.
    Type: Grant
    Filed: June 23, 2000
    Date of Patent: May 20, 2003
    Assignee: Chevron U.S.A. Inc.
    Inventors: Cong-Yan Chen, Dennis J. O'Rear, Scott R. Brundage
  • Patent number: 6566568
    Abstract: A process for preparing a paraffinic product stream in the gasoline, middle distillate fuel and lube ranges from a C2-5-containing feedstock and a C20+ paraffinic feedstock is described. The combined feedstocks are subjected to molecular averaging via dehydrogenation to form olefins, metathesis of the olefins, and rehydrogenation of the olefins to form paraffins. The product stream includes a fraction rich in paraffins the molecular weights of which are between those of the light and heavy paraffin feedstocks, plus some unconverted feeds. The product of the molecular averaging reaction can optionally be isomerized to improve the octane value, in the case of gasoline, or pour point, in the case of middle distillate fuels and lubes. The unconverted feedstocks can be recycled to extinction.
    Type: Grant
    Filed: December 19, 2001
    Date of Patent: May 20, 2003
    Assignee: Chevron U.S.A. Inc.
    Inventor: Cong-Yan Chen
  • Publication number: 20030019792
    Abstract: A catalytic hydrodealkylation/reforming process which comprises contacting a heavy hydrocarbon feedstream under catalytic hydrodealkylation/reforming conditions with a composition comprising borosilicate molecular sieves.
    Type: Application
    Filed: December 11, 2001
    Publication date: January 30, 2003
    Inventors: Cong-Yan Chen, Stacey I. Zones, Andrew Rainis, Dennis J. O'Rear
  • Patent number: 6468501
    Abstract: The present invention provides a method for preparing a zeolite having lattice substituted heteroatoms. The method includes: (a) contacting a calcined borosilicate zeolite with an acid, thereby producing an at least partially deboronated zeolite; and (b) contacting the at least partially deboronated zeolite with a salt-containing aqueous solution comprising one or more salts selected from the group consisting of aluminum salt, gallium salt, and iron salt, thereby producing a silicate or borosilicate zeolite having a lattice comprising aluminum atoms; gallium atoms, iron atoms or a combination thereof. Step (b) is conducted at a pH of about 3.5 or less. Preferably, step (a), step (b) or both are conducted at a temperature of from about ambient temperature to about 300° C., preferably, under stirring/tumbling.
    Type: Grant
    Filed: September 14, 2000
    Date of Patent: October 22, 2002
    Assignee: ChevronTexaco Corporation
    Inventors: Cong-Yan Chen, Stacey I. Zones