Patents by Inventor Kamala R. Krishna

Kamala R. Krishna 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).

  • Publication number: 20240141237
    Abstract: Described herein are processes for hydroisomerising an unconventional feedstock using a hydroisomerisation catalyst comprising zeolite SSZ-91, zeolite SSZ-32, or zeolite SSZ-32x to provide a diesel fuel.
    Type: Application
    Filed: December 20, 2021
    Publication date: May 2, 2024
    Inventors: Kamala R. KRISHNA, Yihua ZHANG, Guan-Dao LEI, Adeola OJO
  • Publication number: 20220204867
    Abstract: Described herein are processes for hydroisomerising an unconventional feedstock using a hydroisomerisation catalyst comprising zeolite SSZ-91, zeolite SSZ-32, or zeolite SSZ-32x to provide a diesel fuel.
    Type: Application
    Filed: December 30, 2020
    Publication date: June 30, 2022
    Inventors: Kamala R. KRISHNA, Yihua ZHANG, GUAN-DAO LEI, Adeola Florence OJO
  • Patent number: 8431014
    Abstract: The invention provides for a process for dewaxing a waxy hydrocarbon feedstock to form a lubricant oil. The invention is also directed to a catalyst system comprising a hydrotreating catalyst upstream of a dewaxing catalyst, used in the dewaxing of a waxy hydrocarbon feedstock to form a lubricant oil. In particular, the invention is directed to a process and catalyst system designed to maintain yield of lubricant oil product. Specifically, the yield of lubricant oil does not decrease more than 2%, at a target pour point, over a dewaxing temperature range. The hydrotreating catalyst helps prevent aging of the dewaxing catalyst and maintains lubricant oil product yield at a target pour point over a wide temperature range. The hydrotreating catalyst comprises platinum, palladium, or combinations thereof on a low acidity inorganic oxide support where acidity is measured by a decalin conversion of less than 10% at 700° F.
    Type: Grant
    Filed: October 6, 2009
    Date of Patent: April 30, 2013
    Assignee: Chevron U.S.A. Inc.
    Inventors: Kamala R. Krishna, James N. Ziemer, Andrew Rainis, Joseph A. Biscardi, Thomas V. Harris
  • Publication number: 20110079540
    Abstract: The invention provides for a process for dewaxing a waxy hydrocarbon feedstock to form a lubricant oil. The invention is also directed to a catalyst system comprising a hydrotreating catalyst upstream of a dewaxing catalyst, used in the dewaxing of a waxy hydrocarbon feedstock to form a lubricant oil. In particular, the invention is directed to a process and catalyst system designed to maintain yield of lubricant oil product. Specifically, the yield of lubricant oil does not decrease more than 2%, at a target pour point, over a dewaxing temperature range. The hydrotreating catalyst helps prevent aging of the dewaxing catalyst and maintains lubricant oil product yield at a target pour point over a wide temperature range. The hydrotreating catalyst comprises platinum, palladium, or combinations thereof on a low acidity inorganic oxide support where acidity is measured by a decalin conversion of less than 10% at 700° F.
    Type: Application
    Filed: October 6, 2009
    Publication date: April 7, 2011
    Inventors: Kamala R. Krishna, James N. Ziemer, Andrew Rainis, Joseph A. Biscardi, Thomas V. Harris
  • Patent number: 7390763
    Abstract: The invention is directed to a method of making a small crystal SSZ-32 zeolite, known as SSZ-32X. The catalyst is suitable for use in a process whereby a feed including straight chain and slightly branched paraffins having 10 or more carbon atoms is dewaxed to produce an isomerized product, with increased yield of isomerized material and decreased production of light ends.
    Type: Grant
    Filed: October 31, 2003
    Date of Patent: June 24, 2008
    Assignee: Chevron U.S.A. Inc.
    Inventors: Stacey I. Zones, Guang Zhang, Kamala R. Krishna, Joseph A. Biscardi, Paul Marcantonio, Euthimios Vittoratos
  • Patent number: 6723889
    Abstract: A process for producing a diesel fuel having at least 70% C10+ paraffins, wherein the iso-paraffin to normal paraffin mole ratio is 5:1 and higher. This diesel fuel is produced by from a feed containing at least 40% C10+ normal paraffins and at least 20% C26+ normal paraffins. It is produced by contacting that feed in an isomerization/cracking reaction zone a feed with a catalyst comprising a SAPO-11 and platinum in the presence of hydrogen (hydrogen:feed ratio of from 1,000 to 10,000 SCFB) at a temperature of from 340° C. to 420° C., a pressure of from 100 psig to 600 psig, and a liquid hourly space velocity of from 0.1 hr−1 to 1.0 hr−1.
    Type: Grant
    Filed: January 22, 2001
    Date of Patent: April 20, 2004
    Assignee: Chevron U.S.A. Inc.
    Inventors: Stephen J. Miller, Arthur John Dahlberg, Kamala R. Krishna, Russell R. Krug
  • Patent number: 6468417
    Abstract: A dewaxed oil having a tendency to form a haze at ambient or sub-ambient temperatures is contacted with a solid adsorbent to remove at least a portion of the haze precursors, thereby reducing the haze-forming tendency of the dewaxed oil.
    Type: Grant
    Filed: January 14, 2000
    Date of Patent: October 22, 2002
    Assignee: Chevron U.S.A. Inc.
    Inventors: Joseph A. Biscardi, Kamala R. Krishna, John M. Rosenbaum, Nadine L. Yenni, R. Larry Howell
  • Patent number: 6468418
    Abstract: A base oil feed having a tendency to form a haze at ambient or sub-ambient temperatures is contacted with a solid adsorbent to remove at least a portion of the haze precursors, thereby reducing the haze-forming tendency of the base oil feed.
    Type: Grant
    Filed: June 9, 2000
    Date of Patent: October 22, 2002
    Assignee: Chevron U.S.A. Inc.
    Inventors: Joseph A. Biscardi, Kamala R. Krishna, John M. Rosenbaum, Nadine L. Yenni, R. Larry Howell, Krishnia Parimi
  • Patent number: 6458265
    Abstract: A diesel fuel having at least 50% C10 to C20 paraffins, wherein the iso-paraffin to normal paraffin mole ratio is up to 21:1 and higher. This diesel fuel can be produced from a feed containing at least 90% C10+ normal paraffins. This diesel fuel is produced by contacting a feed in an isomerization reaction zone a feed with a catalyst comprising a SAPO-11 and platinum in the presence of hydrogen (hydrogen:feed ratio of from 1,000 to 10,000 SCFB) at a temperature of from 340° C. to 420° C., a pressure of from 100 psig to 600 psig, and a liquid hourly space velocity of from 0.1 hr−1 to 1.0 hr−1.
    Type: Grant
    Filed: December 29, 1999
    Date of Patent: October 1, 2002
    Assignee: ChevronTexaco Corporation
    Inventors: Stephen J. Miller, Arthur John Dahlberg, Kamala R. Krishna, Russell R. Krug
  • Publication number: 20010006155
    Abstract: A process for producing a diesel fuel having at least 70% C10+paraffins, wherein the iso-paraffin to normal paraffin mole ratio is 5:1 and higher. This diesel fuel is produced by from a feed containing at least 40% C10+normal paraffins and at least 20% C26+normal paraffins. It is produced by contacting that feed in an isomerization/cracking reaction zone a feed with a catalyst comprising a SAPO-11 and platinum in the presence of hydrogen (hydrogen:feed ratio of from 1,000 to 10,000 SCFB) at a temperature of from 340° C. to 420° C., a pressure of from 100 psig to 600 psig, and a liquid hourly space velocity of from 0.1 hr−1 to 1.0 hr−1.
    Type: Application
    Filed: January 22, 2001
    Publication date: July 5, 2001
    Inventors: Stephen J. Miller, Arthur John Dahlberg, Kamala R. Krishna, Russell R. Krug
  • Patent number: 6204426
    Abstract: A process for producing a diesel fuel having at least 70% C10+ paraffins, wherein the iso-paraffin to normal paraffin mole ratio is 5:1 and higher. This diesel fuel is produced by from a feed containing at least 40% C10+ normal paraffins and at least 20% C26+ normal paraffins. It is produced by contacting that feed in an isomerization/cracking reaction zone a feed with a catalyst comprising a SAPO-11 and platinum in the presence of hydrogen (hydrogen:feed ratio of from 1,000 to 10,000 SCFB) at a temperature of from 340° C. to 420° C., a pressure of from 100 psig to 600 psig, and a liquid hourly space velocity of from 0.1 hr−1 to 1.0 hr−1.
    Type: Grant
    Filed: December 29, 1999
    Date of Patent: March 20, 2001
    Assignee: Chevron U.S.A. Inc.
    Inventors: Stephen J. Miller, Arthur John Dahlberg, Kamala R. Krishna, Russell R. Krug