Patents by Inventor Ajit Bhaskar Dandekar

Ajit Bhaskar Dandekar 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: 9605218
    Abstract: Improved yields of fuels and/or lubricants from a resid or other heavy oil feed can be achieved using slurry hydroconversion to convert at least about 90 wt % of the feed. The converted portion of the feed can then be passed into one or more hydroprocessing stages. An initial processing stage can be a hydrotreatment stage for additional removal of contaminants and for passivation of high activity functional groups that may be created during slurry hydroconversion. The hydrotreatment effluent can then be fractionated to separate naphtha boiling range fractions from distillate fuel boiling range fractions and lubricant boiling range fractions. At least the lubricant boiling range fraction can then be hydrocracked to improve the viscosity properties. The hydrocracking effluent can also be dewaxed to improve the cold flow properties. The hydrocracked and/or dewaxed product can then be optionally hydrofinished.
    Type: Grant
    Filed: June 19, 2014
    Date of Patent: March 28, 2017
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Randolph J. Smiley, Ajit Bhaskar Dandekar, Ramanathan Sundararaman, Rustom Merwan Billimoria, Thomas Francis Degnan, Jr.
  • Patent number: 9394494
    Abstract: Methods are provided for producing multiple lubricating oil basestocks from a feedstock. Prior to dewaxing, various fractions of the feedstock are exposed to hydrocracking conditions of different severity to produce a higher overall yield of basestocks. The hydrocracking conditions of different severity can represent exposing fractions of a feedstock to different processing conditions, exposing fractions of a feedstock to different amounts of hydrocracking catalyst, or a combination thereof.
    Type: Grant
    Filed: July 12, 2012
    Date of Patent: July 19, 2016
    Assignee: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
    Inventors: Eric D. Joseck, Michael Brian Carroll, David Mentzer, Teck-Mui Hoo, Michel Daage, Ajit Bhaskar Dandekar
  • Patent number: 9359565
    Abstract: Systems and methods are provided for using field enhanced separations to produce multiple fractions from a petroleum input. A liquid thermal diffusion and/or electric field separation is used to produce the fractions. The fractions can then be used to form multiple outputs that share a first feature while being different with regard to a second feature. For example, a first fraction from the plurality of fractions can have a desired value for a first property such as viscosity index. Two or more additional fractions from the plurality of fractions can then be blended together to make a blended fraction or output. The blended fraction can have a value for the first property that is substantially similar to the value for the first fraction. However, for a second property, the first fraction and the blended fraction can have distinct values. As a result, multiple output fractions can be formed that share a first feature but differ in a second feature.
    Type: Grant
    Filed: December 18, 2013
    Date of Patent: June 7, 2016
    Assignee: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
    Inventors: Krista Marie Prentice, Jason M. McMullan, Michel Daage, Gregory J. DeMartin, John Stephen Szobota, Ronald M. Gould, Anastasios Ioannis Skoulidas, Ajit Bhaskar Dandekar, Patrick Loring Hanks, Charles Lambert Baker, Jr., Lei Zhang, X B Cox, III
  • Patent number: 9309472
    Abstract: Methods are provided for improving the yield of distillate products from hydroprocessing of gas oil feedstocks, such as vacuum gas oils. It has been unexpectedly found that stripping of gases or fractionation to separate out a distillate fraction during initial hydrotreatment of a feed can provide a substantial increase in distillate yield at a desired amount of feedstock conversion. The improvement in yield of distillate products can allow a desired level of conversion to be performed on a feedstock for generating lubricating base oil products while reducing or minimizing the amount of naphtha (or lower) boiling range products. Alternatively, the improvement in yield of distillate products can correspond to an improved yield during a single pass through a reaction system, so that distillate yield is increased even though a lubricant boiling range product is not generated.
    Type: Grant
    Filed: November 14, 2014
    Date of Patent: April 12, 2016
    Assignee: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
    Inventors: Rohit Vijay, Ajit Bhaskar Dandekar, Michel Daage, Christopher G. Oliveri, Christine Nicole Elia, Darryl Donald Lacy, Scott J. Weigel, Bradley R. Fingland
  • Publication number: 20150152343
    Abstract: Methods are provided for improving the yield of distillate products from hydroprocessing of gas oil feedstocks, such as vacuum gas oils. It has been unexpectedly found that stripping of gases or fractionation to separate out a distillate fraction during initial hydrotreatment of a feed can provide a substantial increase in distillate yield at a desired amount of feedstock conversion. The improvement in yield of distillate products can allow a desired level of conversion to be performed on a feedstock for generating lubricating base oil products while reducing or minimizing the amount of naphtha (or lower) boiling range products. Alternatively, the improvement in yield of distillate products can correspond to an improved yield during a single pass through a reaction system, so that distillate yield is increased even though a lubricant boiling range product is not generated.
    Type: Application
    Filed: November 14, 2014
    Publication date: June 4, 2015
    Applicant: ExxonMobil Research and Engineering Company
    Inventors: Rohit VIJAY, Ajit Bhaskar DANDEKAR, Michel DAAGE, Christopher G. OLIVERI, Christine Nicole ELIA, Darryl Donald LACY, Scott J. WEIGEL, Bradley R. FINGLAND
  • Patent number: 8992764
    Abstract: An integrated process for producing naphtha fuel, diesel fuel and/or lubricant base oils from feedstocks under sour conditions is provided. The ability to process feedstocks under higher sulfur and/or nitrogen conditions allows for reduced cost processing and increases the flexibility in selecting a suitable feedstock. The sour feed can be delivered to a catalytic dewaxing step without any separation of sulfur and nitrogen contaminants. The integrated process includes an initial dewaxing of a feed under sour conditions, optional hydrocracking of the dewaxed feed, and a separation to form a first diesel product and a bottoms fraction. The bottoms fraction is then exposed to additional hydrocracking and dewaxing to form a second diesel product and optionally a lubricant base oil product. Alternatively, a feedstock can be hydrotreated, fractionated, dewaxed, and then hydrocracked to form a diesel fuel and a dewaxed, hydrocracked bottoms fraction that is optionally suitable for use as a lubricant base oil.
    Type: Grant
    Filed: June 27, 2011
    Date of Patent: March 31, 2015
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Krista Marie Prentice, Michel Daage, Ajit Bhaskar Dandekar, Christopher Gordon Oliveri, Rohit Vijay, Stephen J. McCarthy, Wenyih F. Lai, Bradley R. Fingland
  • Publication number: 20150014217
    Abstract: Improved yields of fuels and/or lubricants from a resid or other heavy oil feed can be achieved using slurry hydroconversion to convert at least about 90 wt % of the feed. The converted portion of the feed can then be passed into one or more hydroprocessing stages. An initial processing stage can be a hydrotreatment stage for additional removal of contaminants and for passivation of high activity functional groups that may be created during slurry hydroconversion. The hydrotreatment effluent can then be fractionated to separate naphtha boiling range fractions from distillate fuel boiling range fractions and lubricant boiling range fractions. At least the lubricant boiling range fraction can then be hydrocracked to improve the viscosity properties. The hydrocracking effluent can also be dewaxed to improve the cold flow properties. The hydrocracked and/or dewaxed product can then be optionally hydrofinished.
    Type: Application
    Filed: June 19, 2014
    Publication date: January 15, 2015
    Applicant: ExxonMobil Research and Engineering Company
    Inventors: Randolph J. Smiley, Ajit Bhaskar Dandekar, Ramanathan Sundararaman, Rustom Merwan Billimoria, Thomas Francis Degnan, JR.
  • Publication number: 20140197071
    Abstract: Systems and methods are provided for using field enhanced separations to produce multiple fractions from a petroleum input. A liquid thermal diffusion and/or electric field separation is used to produce the fractions. The fractions can then be used to form multiple outputs that share a first feature while being different with regard to a second feature. For example, a first fraction from the plurality of fractions can have a desired value for a first property such as viscosity index. Two or more additional fractions from the plurality of fractions can then be blended together to make a blended fraction or output. The blended fraction can have a value for the first property that is substantially similar to the value for the first fraction. However, for a second property, the first fraction and the blended fraction can have distinct values. As a result, multiple output fractions can be formed that share a first feature but differ in a second feature.
    Type: Application
    Filed: December 18, 2013
    Publication date: July 17, 2014
    Applicant: ExxonMobil Research and Engineering Company
    Inventors: Krista M. Prentice, Jason M. McMullan, Michel Daage, Gregory J. DeMartin, John Stephen Szobota, Ronald M. Gould, Anastasios Ioannis Skoulidas, Ajit Bhaskar Dandekar, Patrick Loring Hanks, Charles Lambert Baker, JR., Lei Zhang, X B. Cox, III
  • Publication number: 20140042056
    Abstract: A suitable feedstock for forming lubricant base oils is separated into at least a lower boiling portion and a higher boiling portion. The lower boiling portion is combined with a feed suitable for use as a fuels hydrocracking feed. The combined feed is hydrocracked and catalytically dewaxed in order to form fuels and Group II, Group II+, or Group III light neutral basestocks. The higher boiling portion of the feedstock is solvent processed in order to form Group I heavy neutral base oils and/or Group I brightstock base oils. The higher boiling portion of the feedstock can correspond to both a bottoms fraction and one or more additional fractions boiling above a fractionation cut point.
    Type: Application
    Filed: August 10, 2012
    Publication date: February 13, 2014
    Applicant: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
    Inventors: Michel Daage, Jason Thomas Calla, Krista Marie Prentice, Ajit Bhaskar Dandekar
  • Patent number: 8617383
    Abstract: An integrated process for producing naphtha fuel, diesel fuel and/or lubricant base oils from feedstocks under sour conditions is provided. The ability to process feedstocks under higher sulfur and/or nitrogen conditions allows for reduced cost processing and increases the flexibility in selecting a suitable feedstock. The sour feed can be delivered to a catalytic dewaxing step without any separation of sulfur and nitrogen contaminants, or with only a high pressure separation so that the dewaxing still occurs under sour conditions. Various combinations of hydrotreating, catalytic dewaxing, hydrocracking, and hydrofinishing can be used to produce fuel products and lubricant base oil products.
    Type: Grant
    Filed: June 27, 2011
    Date of Patent: December 31, 2013
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Krista Marie Prentice, Michel Daage, Ajit Bhaskar Dandekar, Christopher Gordon Oliveri, Rohit Vijay, Stephen J. McCarthy, Wenyih F. Lai, Bradley R. Fingland
  • Publication number: 20130092598
    Abstract: Methods are provided for producing multiple lubricating oil basestocks from a feedstock. Prior to dewaxing, various fractions of the feedstock are exposed to hydrocracking conditions of different severity to produce a higher overall yield of basestocks. The hydrocracking conditions of different severity can represent exposing fractions of a feedstock to different processing conditions, exposing fractions of a feedstock to different amounts of hydrocracking catalyst, or a combination thereof.
    Type: Application
    Filed: July 12, 2012
    Publication date: April 18, 2013
    Applicant: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
    Inventors: Eric D. Joseck, Michael Brian Carroll, David Mentzer, Teck-Mui Hoo, Michel Daage, Ajit Bhaskar Dandekar
  • Patent number: 8394255
    Abstract: An integrated process for producing naphtha fuel, diesel fuel and/or lubricant base oils from feedstocks under sour conditions is provided. The ability to process feedstocks under higher sulfur and/or nitrogen conditions allows for reduced cost processing and increases the flexibility in selecting a suitable feedstock. The sour feed can be delivered to a catalytic dewaxing step without any separation of sulfur and nitrogen contaminants, or a high pressure separation can be used to partially eliminate contaminants. The integrated process includes an initial hydrotreatment, hydrocracking, catalytic dewaxing of the hydrocracking effluent, and an option final hydrotreatment.
    Type: Grant
    Filed: December 23, 2009
    Date of Patent: March 12, 2013
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Stephen J. McCarthy, Gary Paul Schleicher, Krista Marie Prentice, Michel Daage, Christopher Gordon Oliveri, Thomas Francis Degnan, José Guadalupe Santiesteban, Ajit Bhaskar Dandekar, William Joseph Novak, Wenyih F. Lai
  • Publication number: 20110315599
    Abstract: An integrated process for producing naphtha fuel, diesel fuel and/or lubricant base oils from feedstocks under sour conditions is provided. The ability to process feedstocks under higher sulfur and/or nitrogen conditions allows for reduced cost processing and increases the flexibility in selecting a suitable feedstock. The sour feed can be delivered to a catalytic dewaxing step without any separation of sulfur and nitrogen contaminants, or with only a high pressure separation so that the dewaxing still occurs under sour conditions. Various combinations of hydrotreating, catalytic dewaxing, hydrocracking, and hydrofinishing can be used to produce fuel products and lubricant base oil products.
    Type: Application
    Filed: June 27, 2011
    Publication date: December 29, 2011
    Applicant: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
    Inventors: Krista Marie Prentice, Michel Daage, Ajit Bhaskar Dandekar, Christopher Gordon Oliveri, Rohit Vijay, Stephen J. McCarthy, Wenyih F. Lai, Bradley R. Fingland
  • Publication number: 20110315596
    Abstract: An integrated process for producing naphtha fuel, diesel fuel and/or lubricant base oils from feedstocks under sour conditions is provided. The ability to process feedstocks under higher sulfur and/or nitrogen conditions allows for reduced cost processing and increases the flexibility in selecting a suitable feedstock. The sour feed can be delivered to a catalytic dewaxing step without any separation of sulfur and nitrogen contaminants. The integrated process includes an initial dewaxing of a feed under sour conditions, optional hydrocracking of the dewaxed feed, and a separation to form a first diesel product and a bottoms fraction. The bottoms fraction is then exposed to additional hydrocracking and dewaxing to form a second diesel product and optionally a lubricant base oil product. Alternatively, a feedstock can be hydrotreated, fractionated, dewaxed, and then hydrocracked to form a diesel fuel and a dewaxed, hydrocracked bottoms fraction that is optionally suitable for use as a lubricant base oil.
    Type: Application
    Filed: June 27, 2011
    Publication date: December 29, 2011
    Applicant: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
    Inventors: Krista Marie Prentice, Michel Daage, Ajit Bhaskar Dandekar, Christopher Gordon Oliveri, Rohit Vijay, Stephen J. McCarthy, Wenyih F. Lai, Bradley R. Fingland
  • Publication number: 20100187155
    Abstract: An integrated process for producing naphtha fuel, diesel fuel and/or lubricant base oils from feedstocks under sour conditions is provided. The ability to process feedstocks under higher sulfur and/or nitrogen conditions allows for reduced cost processing and increases the flexibility in selecting a suitable feedstock. The sour feed can be delivered to a catalytic dewaxing step without any separation of sulfur and nitrogen contaminants, or a high pressure separation can be used to partially eliminate contaminants. The integrated process includes an initial hydrotreatment, hydrocracking, catalytic dewaxing of the hydrocracking effluent, and an option final hydrotreatment.
    Type: Application
    Filed: December 23, 2009
    Publication date: July 29, 2010
    Inventors: Stephen J. McCarthy, Gary Paul Schleicher, Krista Marie Prentice, Michel Daage, Christopher Gordon Oliveri, Thomas Francis Degnan, Jose Guadalupe Santiesteban, Ajit Bhaskar Dandekar, William Joseph Novak, Wenyih F. Lai
  • Patent number: 7019185
    Abstract: In a method for producing monoalkylated aromatic compounds, an aromatic feed is contacted with an alkylating agent in the presence of a catalyst comprising a molecular sieve having an X-ray diffraction pattern including d-spacing maxima at 12.4±0.25, 6.9±0.15, 3.57±0.07, and 3.42±0.07 Angstrom. The catalyst also contains at least one metal cation selected from Groups 1–4 and 7–16 of the Periodic Table of Elements, wherein the metal cation is present in an amount of at least 0.5% by weight of the catalyst, whereby selectivity of the catalyst to produce monoalkylates over polyalkylates is improved as compared with the identical catalyst but without the metal cation present.
    Type: Grant
    Filed: December 6, 2002
    Date of Patent: March 28, 2006
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Ajit Bhaskar Dandekar, John P. McWilliams, Thomas Francis Degnan, Jr., Michael Hryniszak
  • Patent number: 6936744
    Abstract: The present invention provides a process for producing a monoalkylated aromatic compound, particularly cumene, comprising the step of contacting a polyalkylated aromatic compound with an alkylatable aromatic compound under at least partial liquid phase conditions and in the presence of a transalkylation catalyst to produce the monoalkylated aromatic compound, wherein the transalkylation catalyst comprises a mixture of at least two different crystalline molecular sieves, wherein each of said molecular sieves is selected from zeolite beta, zeolite Y, mordenite and a material having an X-ray diffraction pattern including d-spacing maxima at 12.4±0.25, 6.9±0.15, 3.57±0.07 and 3.42±0.07 Angstrom.
    Type: Grant
    Filed: July 19, 2000
    Date of Patent: August 30, 2005
    Assignee: ExxonMobil Chemical Patents, Inc.
    Inventors: Jane Chi Ya Cheng, Michael Alan Steckel, Charles Morris Smith, William Alois Weber, Stephen Harold Brown, Ajit Bhaskar Dandekar, Michael Alan Better
  • Publication number: 20040111001
    Abstract: In a method for producing monoalkylated aromatic compounds, an aromatic feed is contacted with an alkylating agent in the presence of a catalyst comprising a molecular sieve having an X-ray diffraction pattern including d-spacing maxima at 12.4±0.25, 6.9±0.15, 3.57±0.07, and 3.42±0.07 Angstrom. The catalyst also contains at least one metal cation selected from Groups 1-4 and 7-16 of the Periodic Table of Elements, wherein the metal cation is present in an amount of at least 0.5% by weight of the catalyst, whereby selectivity of the catalyst to produce monoalkylates over polyalkylates is improved as compared with the identical catalyst but without the metal cation present.
    Type: Application
    Filed: December 6, 2002
    Publication date: June 10, 2004
    Inventors: Ajit Bhaskar Dandekar, John P. McWilliams, Thomas Francis Degnan, Michael Hryniszak