Patents by Inventor Guan Dao Lei

Guan Dao Lei 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: 9573124
    Abstract: A new crystalline molecular sieve designated SSZ-95 is disclosed. In general, SSZ-95 is synthesized from a reaction mixture suitable for synthesizing MTT-type molecular sieves and maintaining the mixture under crystallization conditions sufficient to form product. The product molecular sieve is subjected to a pre-calcination step, and ion-exchange to remove extra-framework cations, and a post-calcination step. The molecular sieve has a MTT-type framework and a H-D exchangeable acid site density of 0 to 50% relative to molecular sieve SSZ-32.
    Type: Grant
    Filed: May 21, 2014
    Date of Patent: February 21, 2017
    Assignee: Chevron U.S.A. Inc.
    Inventors: Adeola Florence Ojo, Yihua Zhang, Stacey Ian Zones, Guan-Dao Lei
  • Publication number: 20160089663
    Abstract: The present invention is directed to an improved finished hydroisomerization catalyst manufactured from a first high nanopore volume (HNPV) alumina having a broad pore size distribution (BPSD), and a second HNPV alumina having narrow pore size distribution (NPSD). Their combination yields a HNPV base extrudate having larger porosity with a bimodal pore size distribution as compared to a conventional base extrudates.
    Type: Application
    Filed: September 23, 2015
    Publication date: March 31, 2016
    Inventors: Yihua ZHANG, Kamala Raghunathan KRISHNA, Guan-Dao LEI, Theodorus Ludovicus Michael MAESEN
  • Publication number: 20160089664
    Abstract: The present invention is directed to an improved finished hydroisomerization catalyst manufactured from a first high nanopore volume (HNPV) alumina having a broad pore size distribution (BPSD), and a second HNPV alumina having narrow pore size distribution (NPSD). Their combination yields a HNPV base extrudate having higher total nanopore volume with a bimodal pore size distribution as compared to a conventional base extrudates.
    Type: Application
    Filed: September 23, 2015
    Publication date: March 31, 2016
    Inventors: Yihua ZHANG, Kamala Raghunathan KRISHNA, Guan-Dao LEI, Theodorus Ludovicus Michael MAESEN
  • Publication number: 20160089666
    Abstract: The present invention is directed to an improved finished hydroisomerization catalyst manufactured from a first high nanopore volume (HNPV) alumina and a pore size distribution characterized by a full width at half-maximum, normalized to pore volume, of 15 to 25 nm·g/cc, and a second HNPV alumina having a pore size distribution characterized by a full width at half-maximum, normalized to pore volume, of 5 to 15 nm·g/cc. Their combination yields a HNPV base extrudate having a low particle density as compared to a conventional base extrudates.
    Type: Application
    Filed: September 23, 2015
    Publication date: March 31, 2016
    Inventors: Yihua ZHANG, Kamala Raghunathan KRISHNA, Guan-Dao LEI, Theodorus Ludovicus Michael MAESEN
  • Publication number: 20160089665
    Abstract: The present invention is directed to an improved finished hydroisomerization catalyst manufactured from a first high nanopore volume (HNPV) alumina having a broad pore size distribution (BPSD), and a second HNPV alumina having narrow pore size distribution (NPSD). Their combination yields a HNPV base extrudate having a low particle density as compared to a conventional base extrudates.
    Type: Application
    Filed: September 23, 2015
    Publication date: March 31, 2016
    Inventors: Yihua ZHANG, Kamala Raghunathan KRISHNA, Guan-Dao LEI, Theodorus Ludovicus Michael MAESEN
  • Publication number: 20150336091
    Abstract: A new crystalline molecular sieve designated SSZ-95 is disclosed. The molecular sieve has a MTT-type framework, a mole ratio of 20 to 70 of silicon oxide to aluminum oxide, a total micropore volume of between 0.005 and 0.02 cc/g; and a H-D exchangeable acid site density of up to 50% relative to SSZ-32.
    Type: Application
    Filed: May 21, 2014
    Publication date: November 26, 2015
    Applicant: Chevron U.S.A. Inc.
    Inventors: Adeola Florence Ojo, Yihua Zhang, Guan-Dao Lei, Stacey Ian Zones
  • Publication number: 20150336089
    Abstract: A new crystalline molecular sieve designated SSZ-95 is disclosed. In general, SSZ-95 is synthesized from a reaction mixture suitable for synthesizing MTT-type molecular sieves and maintaining the mixture under crystallization conditions sufficient to form product. The product molecular sieve is subjected to a pre-calcination step, and ion-exchange to remove extra-framework cations, and a post-calcination step. The molecular sieve has a MTT-type framework and a H-D exchangeable acid site density of 0 to 50% relative to molecular sieve SSZ-32.
    Type: Application
    Filed: May 21, 2014
    Publication date: November 26, 2015
    Applicant: Chevron U.S.A. Inc.
    Inventors: Adeola Florence Ojo, Yihua Zhang, Guan-Dao Lei, Stacey Ian Zones
  • Publication number: 20150136646
    Abstract: A process is provided for producing a heavy lubricating base oil by hydrocracking a lubricating oil feedstock at high yield. The lubricating oil feedstock contains a hydroprocessed stream that is difficult to process using a conventional catalyst system. The catalyst used in the process includes a mixed metal sulfide catalyst that comprises at least one Group VIB metal and at least one Group VIII metal. The process also provides for hydroisomerization and hydrofinishing process steps to prepare the lubricating base oil.
    Type: Application
    Filed: November 14, 2014
    Publication date: May 21, 2015
    Applicant: Chevron U.S.A. Inc.
    Inventors: Bi-Zeng Zhan, Horacio Trevino, Theodorus Ludovicus Michael Maesen, Guan-Dao Lei
  • Publication number: 20140291206
    Abstract: Processes and catalyst systems are provided for dewaxing a hydrocarbon feedstock to form a lubricant base oil. A layered catalyst system of the present invention may comprise a first hydroisomerization dewaxing catalyst disposed upstream from a second hydroisomerization dewaxing catalyst. Each of the first and second hydroisomerization dewaxing catalysts may be selective for the isomerization of n-paraffins. The first hydroisomerization catalyst may have a higher level of selectivity for the isomerization of n-paraffins than the second hydroisomerization dewaxing catalyst. At least one of the first and second hydroisomerization dewaxing catalysts comprises small crystallite zeolite SSZ-32x.
    Type: Application
    Filed: June 9, 2014
    Publication date: October 2, 2014
    Applicant: CHEVRON U.S.A. INC.
    Inventors: Kamala Krishna, Guan-Dao Lei
  • Patent number: 8790507
    Abstract: Processes and catalyst systems are provided for dewaxing a hydrocarbon feedstock to form a lubricant base oil. A layered catalyst system of the present invention may comprise a first hydroisomerization dewaxing catalyst disposed upstream from a second hydroisomerization dewaxing catalyst. Each of the first and second hydroisomerization dewaxing catalysts may be selective for the isomerization of n-paraffins. The first hydroisomerization catalyst may have a higher level of selectivity for the isomerization of n-paraffins than the second hydroisomerization dewaxing catalyst. At least one of the first and second hydroisomerization dewaxing catalysts comprises small crystallite zeolite SSZ-32x.
    Type: Grant
    Filed: June 14, 2011
    Date of Patent: July 29, 2014
    Assignee: Chevron U.S.A. Inc.
    Inventors: Kamala Krishna, Guan-Dao Lei
  • Patent number: 8617387
    Abstract: Processes and catalyst systems are provided for dewaxing a light hydrocarbon feedstock to form a lubricant base oil. A layered catalyst system of the present invention may comprise a first hydroisomerization dewaxing catalyst disposed upstream from a second hydroisomerization dewaxing catalyst. Each of the first and second hydroisomerization dewaxing catalysts may be selective for the isomerization of n-paraffins. The first hydroisomerization catalyst may have a higher level of selectivity for the isomerization of n-paraffins than the second hydroisomerization dewaxing catalyst.
    Type: Grant
    Filed: June 14, 2011
    Date of Patent: December 31, 2013
    Assignee: Chevron U.S.A. Inc.
    Inventors: Kamala Krishna, Guan-Dao Lei
  • Publication number: 20130260985
    Abstract: A catalyst system is provided for dewaxing a heavy hydrocarbon feedstock to form a lubricant base oil. A layered catalyst system of the present invention may comprise a first hydroisomerization dewaxing catalyst disposed upstream from a second hydroisomerization dewaxing catalyst. Each of the first and second hydroisomerization dewaxing catalysts may be selective for the isomerization of n-paraffins. The first hydroisomerization catalyst has a first level of selectivity for the isomerization of n-paraffins, the second hydroisomerization dewaxing catalyst has a second level of selectivity for the isomerization of n-paraffins, and a layered catalyst system comprising the first and second hydroisomerization dewaxing catalysts has a third level of selectivity for the isomerization of n-paraffins. The third level of selectivity may be higher than each of the first level of selectivity and the second level of selectivity.
    Type: Application
    Filed: May 30, 2013
    Publication date: October 3, 2013
    Applicant: Chevron U.S.A. Inc.
    Inventors: Kamala Raghunathan Krishna, Guan-Dao Lei
  • Patent number: 8475648
    Abstract: Processes and catalyst systems are provided for dewaxing a heavy hydrocarbon feedstock to form a lubricant base oil. A layered catalyst system of the present invention may comprise a first hydroisomerization dewaxing catalyst disposed upstream from a second hydroisomerization dewaxing catalyst. Each of the first and second hydroisomerization dewaxing catalysts may be selective for the isomerization of n-paraffins. The first hydroisomerization catalyst has a first level of selectivity for the isomerization of n-paraffins, the second hydroisomerization dewaxing catalyst has a second level of selectivity for the isomerization of n-paraffins, and a layered catalyst system comprising the first and second hydroisomerization dewaxing catalysts has a third level of selectivity for the isomerization of n-paraffins. The third level of selectivity may be higher than each of the first level of selectivity and the second level of selectivity.
    Type: Grant
    Filed: June 14, 2011
    Date of Patent: July 2, 2013
    Assignee: Chevron U.S.A. Inc.
    Inventors: Kamala Krishna, Guan-Dao Lei
  • Publication number: 20110315598
    Abstract: Processes and catalyst systems are provided for dewaxing a hydrocarbon feedstock to form a lubricant base oil. A layered catalyst system of the present invention may comprise a first hydroisomerization dewaxing catalyst disposed upstream from a second hydroisomerization dewaxing catalyst. Each of the first and second hydroisomerization dewaxing catalysts may be selective for the isomerization of n-paraffins. The first hydroisomerization catalyst may have a higher level of selectivity for the isomerization of n-paraffins than the second hydroisomerization dewaxing catalyst. At least one of the first and second hydroisomerization dewaxing catalysts comprises small crystallite zeolite SSZ-32x.
    Type: Application
    Filed: June 14, 2011
    Publication date: December 29, 2011
    Applicant: Chevron U.S.A. Inc
    Inventors: Kamala Krishna, Guan-Dao Lei
  • Publication number: 20110315597
    Abstract: Processes and catalyst systems are provided for dewaxing a heavy hydrocarbon feedstock to form a lubricant base oil. A layered catalyst system of the present invention may comprise a first hydroisomerization dewaxing catalyst disposed upstream from a second hydroisomerization dewaxing catalyst. Each of the first and second hydroisomerization dewaxing catalysts may be selective for the isomerization of n-paraffins. The first hydroisomerization catalyst has a first level of selectivity for the isomerization of n-paraffins, the second hydroisomerization dewaxing catalyst has a second level of selectivity for the isomerization of n-paraffins, and a layered catalyst system comprising the first and second hydroisomerization dewaxing catalysts has a third level of selectivity for the isomerization of n-paraffins. The third level of selectivity may be higher than each of the first level of selectivity and the second level of selectivity.
    Type: Application
    Filed: June 14, 2011
    Publication date: December 29, 2011
    Applicant: Chevron U.S.A. Inc
    Inventors: Kamala Krishna, Guan-Dao Lei
  • Publication number: 20110319685
    Abstract: Processes and catalyst systems are provided for dewaxing a light hydrocarbon feedstock to form a lubricant base oil. A layered catalyst system of the present invention may comprise a first hydroisomerization dewaxing catalyst disposed upstream from a second hydroisomerization dewaxing catalyst. Each of the first and second hydroisomerization dewaxing catalysts may be selective for the isomerization of n-paraffins. The first hydroisomerization catalyst may have a higher level of selectivity for the isomerization of n-paraffins than the second hydroisomerization dewaxing catalyst.
    Type: Application
    Filed: June 14, 2011
    Publication date: December 29, 2011
    Applicant: Chevron U.S.A. Inc
    Inventors: Kamala Krishna, Guan-Dao Lei
  • Patent number: 7431821
    Abstract: The present invention relates to an olefinic naphtha and a process for producing lower olefinc from this naphtha. In the process of the present invention for producing lower olefins, preferably ethylene, at least a portion of a hydrocarbon asset is converted to synthesis gas and at least a portion of the synthesis gas is converted to an olefinic naphtha by a Fischer-Tropsch process. At least a portion of the olefinic naphtha is converted in a naphtha cracker to a product stream comprising lower olefins, and at least a portion of the lower olefins from the product stream of the cracker are recovered.
    Type: Grant
    Filed: January 31, 2003
    Date of Patent: October 7, 2008
    Assignee: Chevron U.S.A. Inc.
    Inventors: Dennis J. O'Rear, Guan Dao Lei
  • Patent number: 7179364
    Abstract: The present invention relates to a stable, low sulfur, olefinic distillate fuel blend component derived from a Fischer-Tropsch process and a process for producing this stable, low sulfur, olefinic distillate fuel blend component. The stable, low sulfur, olefinic distillate fuel comprises olefins in an amount of 2 to 80 weight percent, non-olefins in an amount of 20 to 98 weight percent wherein the non-olefins are predominantly paraffins, oxygenates in an amount of less than 1 weight percent, and sulfur in an amount of less than 10 ppm by weight. A distillate fuel comprising the above blend component forms less than 5 ppm peroxides after storage at 60° C. for four weeks.
    Type: Grant
    Filed: January 31, 2003
    Date of Patent: February 20, 2007
    Assignee: Chevron U.S.A. Inc.
    Inventors: Dennis J O'Rear, Guan Dao Lei
  • Patent number: 7150821
    Abstract: The present invention relates to an olefinic naphtha and a process for producing lower olefins from this naphtha. In the process of the present invention for producing lower olefins, preferably ethylene, at least a portion of a hydrocarbon asset is converted to synthesis gas and at least a portion of the synthesis gas is converted to an olefinic naphtha by a Fischer-Tropsch process. At least a portion of the olefinic naphtha is converted in a naphtha cracker to a product stream comprising lower olefins, and at least a portion of the lower olefins from the product stream of the naphtha cracker are recovered.
    Type: Grant
    Filed: January 31, 2003
    Date of Patent: December 19, 2006
    Assignee: Chevron U.S.A. Inc.
    Inventors: Dennis J. O'Rear, Guan Dao Lei
  • Publication number: 20060149107
    Abstract: A process for oligomerizing the olefins present in a Fischer-Tropsch derived condensate containing a mixture of olefins and oxygenates and boiling in the range of diesel which comprises (a) removing substantially all of the oxygenates present in the Fischer-Tropsch condensate; (b) contacting the Fischer-Tropsch derived condensate having less than 100 ppmw elemental oxygen with an ionic liquid catalyst in an oligomerization zone under oligomerization reaction conditions; and (c) recovering from the oligomerization zone a Fischer-Tropsch derived product having molecules characterized by a higher average molecular weight and increased branching as compared to the Fischer-Tropsch derived condensate.
    Type: Application
    Filed: March 10, 2006
    Publication date: July 6, 2006
    Inventors: Thomas Harris, Michael Cheng, Guan-Dao Lei