Patents by Inventor Ajit B. Dandekar
Ajit B. 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).
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Patent number: 11674089Abstract: Systems and methods are provided for conversion of a combined feed of oxygenates (such as methanol or dimethyl ether) and olefins to a high octane naphtha boiling range product with a reduced or minimized aromatics content. The oxygenate conversion can be performed under conditions that reduce or minimize hydrogen transfer. Optionally, a catalyst that further facilitates formation of branched paraffins can be used, such as a catalyst that has some type of 12-member ring site available on the catalyst surface.Type: GrantFiled: September 8, 2020Date of Patent: June 13, 2023Assignee: EXXONMOBIL TECHNOLOGY AND ENGINEERING COMPANYInventors: Brandon J. O'Neill, Mark A. Deimund, Ajit B. Dandekar
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Patent number: 11352571Abstract: Systems and methods are provided for conversion of oxygenate feeds to lubricant and/or distillate boiling range compounds with desirable properties by first selectively converting oxygenates to light olefins and then converting the light olefins to distillate and lubricant boiling range compounds with beneficial properties. The distillate boiling range products can have an unexpectedly high cetane, while the lubricant boiling range products can have an unexpectedly high viscosity index. The ability to form the distillate boiling range products and lubricant boiling range products is facilitated by using a Ni-enhanced oligomerization catalyst.Type: GrantFiled: July 29, 2019Date of Patent: June 7, 2022Assignee: ExxonMobil Technology and Engineering CompanyInventors: Mark A. Deimund, Brandon J. O'Neill, Ajit B. Dandekar
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Publication number: 20210300842Abstract: Zeolitic and molecular organic framework materials as catalysts suitable for generating branched olefins from linear olefins, thereby increasing the octane of a composition comprising the linear olefins. In particular, catalyst may exhibit selectivity for methyl-shift isomerization over cracking, alkylation, and oligomerization.Type: ApplicationFiled: February 16, 2021Publication date: September 30, 2021Inventors: Brandon J. O'Neill, Joe M. Falkowski, Allen W. Burton, Scott J. Weigel, Randall J. Meyer, Ajit B. Dandekar
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Publication number: 20210087474Abstract: Systems and methods are provided for conversion of a combined feed of oxygenates (such as methanol or dimethyl ether) and olefins to a high octane naphtha boiling range product with a reduced or minimized aromatics content. The oxygenate conversion can be performed under conditions that reduce or minimize hydrogen transfer. Optionally, a catalyst that further facilitates formation of branched paraffins can be used, such as a catalyst that has some type of 12-member ring site available on the catalyst surface.Type: ApplicationFiled: September 8, 2020Publication date: March 25, 2021Inventors: Brandon J. O'Neill, Mark A. Deimund, Ajit B. Dandekar
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Patent number: 10947464Abstract: Systems and methods are provided for integration of use deasphalted resid as a feed for fuels and/or lubricant base stock production with use of the corresponding deasphalter rock for gasification to generate hydrogen and/or fuel for the fuels and/or lubricant production process. The integration can include using hydrogen generated during gasification as a fuel to provide heat for solvent processing and/or using the hydrogen for hydroprocessing of deasphalted oil.Type: GrantFiled: December 27, 2016Date of Patent: March 16, 2021Assignee: EXXONMOBIL RESEARCH AND ENGINEERING COMPANYInventors: Kendall S. Fruchey, Sara K. Green, Anjaneya S. Kovvali, Timothy L. Hilbert, Michael B. Carroll, Ajit B. Dandekar, Sara L. Yohe, Stephen H. Brown, Tracie L. Owens, April D. Ross, Eric B. Senzer, Steven Pyl
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Patent number: 10920636Abstract: Systems and methods are provided for performing selective catalytic reduction on engine exhaust using ethanol from the engine fuel as the reducing agent. Fuel from a fuel tank or other fuel source can be passed through a separation module to produce a fuel stream with a reduced ethanol content and an ethanol-enriched fraction. After combustion of fuel under lean conditions, the combustion exhaust can be exposed to a catalyst system in the presence of the ethanol-enriched fraction.Type: GrantFiled: October 29, 2018Date of Patent: February 16, 2021Assignee: ExxonMobil Research and Engineering CompanyInventors: Brian M. P. Weiss, Shamel Merchant, Randall D. Partridge, Benjamin A. McCool, Ajit B. Dandekar, Herbert W. Barry
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Patent number: 10808185Abstract: Methods are provided for forming lubricant base stocks from feeds such as vacuum resid or other 510° C.+ feeds. A feed can be deasphalted and then catalytically and/or solvent processed to form lubricant base stocks, including bright stocks that are resistant to haze formation.Type: GrantFiled: December 27, 2016Date of Patent: October 20, 2020Assignee: ExxonMobil Research and Engineering CompanyInventors: Timothy L. Hilbert, Michael B. Carroll, Ajit B. Dandekar, Sara L. Yohe, Stephen H. Brown, Tracie L. Owens, April D. Ross, Eric B. Senzer, Steven Pyl, Rugved P. Pathare, Lisa I-Ching Yeh, Bradley R. Fingland, Keith K. Aldous, Anjaneya S. Kovvali, Kendall S. Fruchey, Sara K. Green, Camden N. Henderson
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Publication number: 20200055797Abstract: Systems and methods are provided for conversion of oxygenate feeds to lubricant and/or distillate boiling range compounds with desirable properties by first selectively converting oxygenates to light olefins and then converting the light olefins to distillate and lubricant boiling range compounds with beneficial properties. The distillate boiling range products can have an unexpectedly high cetane, while the lubricant boiling range products can have an unexpectedly high viscosity index. The ability to form the distillate boiling range products and lubricant boiling range products is facilitated by using a Ni-enhanced oligomerization catalyst.Type: ApplicationFiled: July 29, 2019Publication date: February 20, 2020Inventors: Mark A. DEIMUND, Brandon J. O'NEILL, Ajit B. DANDEKAR
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Publication number: 20200056106Abstract: Systems and methods are provided for conversion of oxygenate feeds to lubricant and/or distillate boiling range compounds with desirable properties by first selectively converting oxygenates to light olefins and then converting the light olefins to distillate and lubricant boiling range compounds with beneficial properties. The distillate boiling range products can have an unexpectedly high cetane, while the lubricant boiling range products can have an unexpectedly high viscosity index. The ability to form the distillate boiling range products and lubricant boiling range products is facilitated by using a Ni-enhanced oligomerization catalyst.Type: ApplicationFiled: July 29, 2019Publication date: February 20, 2020Inventors: Mark A. DEIMUND, Brandon J. O'NEILL, Ajit B. DANDEKAR
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Patent number: 10550341Abstract: Methods are provided for producing lubricant base stocks from deasphalted oils formed by sequential deasphalting. The deasphalted oil can be exposed a first deasphalting process using a first solvent that can provide a lower severity of deasphalting and a second deasphalting process using a second solvent that can provide a higher severity of deasphalting. This can result in formation of at least a deasphalted oil and a resin fraction. The resin fraction can represent a fraction that traditionally would have been included as part of a deasphalter rock fraction.Type: GrantFiled: December 27, 2016Date of Patent: February 4, 2020Assignee: ExxonMobil Research and Engineering CompanyInventors: Mohsen N. Harandi, Doron Levin, Himanshu Gupta, James R. Lattner, Glenn C. Wood, Keith K. Aldous, Timothy L. Hilbert, Michael B. Carroll, Ajit B. Dandekar, Sara L. Yohe, Stephen H. Brown, Tracie L. Owens, April D. Ross, Eric B. Senzer, Steven Pyl
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Publication number: 20200010772Abstract: Systems and methods are provided for producing lubricant basestocks having a reduced or minimized aromatics content. A first processing stage can perform an initial amount of hydrotreating and/or hydrocracking. A first separation stage can then be used to remove fuels boiling range (and lower boiling range) compounds. The remaining lubricant boiling range fraction can then be exposed under hydrocracking conditions to a USY catalyst including a supported noble metal, such as Pt and/or Pd. The USY catalyst can have a desirable combination of catalyst properties, such as a unit cell size of 24.30 or less (or 24.24 or less), a silica to alumina ratio of at least 50 (or at least 80), and an alpha value of 20 or less (or 10 or less). In some aspects, the effluent from the second (hydrocracking) stage can be dewaxed without further separation. In such aspects, a portion of the dewaxed effluent can be used as a recycle quench stream to cool the hydrocracking effluent prior to entering the dewaxing reactor.Type: ApplicationFiled: September 17, 2019Publication date: January 9, 2020Inventors: Ajit B. Dandekar, Bradley R. Fingland, Kendall S. Fruchey, Scott J. Weigel
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Patent number: 10457877Abstract: Systems and methods are provided for producing lubricant basestocks having a reduced or minimized aromatics content. A first processing stage can perform an initial amount of hydrotreating and/or hydrocracking. A first separation stage can then be used to remove fuels boiling range (and lower boiling range) compounds. The remaining lubricant boiling range fraction can then be exposed under hydrocracking conditions to a USY catalyst including a supported noble metal, such as Pt and/or Pd. The USY catalyst can have a desirable combination of catalyst properties, such as a unit cell size of 24.30 or less (or 24.24 or less), a silica to alumina ratio of at least 50 (or at least 80), and an alpha value of 20 or less (or 10 or less). In some aspects, the effluent from the second (hydrocracking) stage can be dewaxed without further separation. In such aspects, a portion of the dewaxed effluent can be used as a recycle quench stream to cool the hydrocracking effluent prior to entering the dewaxing reactor.Type: GrantFiled: March 24, 2017Date of Patent: October 29, 2019Assignee: ExxonMobil Research and Engineering CompanyInventors: Ajit B. Dandekar, Bradley R. Fingland, Kendall S. Fruchey, Scott J. Weigel
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Publication number: 20190309231Abstract: Systems and methods are provided for reducing the end point of distillate fuel boiling range fractions while reducing or minimizing conversion of the distillate fuel to naphtha or light ends. To perform end point reduction, a distillate boiling range fraction is exposed to a conversion catalyst that has a total surface area of at least 200 m2/g, an average pore size of 12 Angstroms or more, and/or a low acidity, where the conversion catalyst includes a supported Group 8-10 metal, such as a supported Group 8-10 noble metal. Such a conversion catalyst can have improved activity for reducing end point of a distillate fuel fraction while reducing or minimizing conversion relative to 177° C. Performing end point reduction using such a catalyst can allow for increased yields of distillate fuel boiling range products by allowing increased amounts of heavy feed components to be included in the input to a distillate fuel processing train.Type: ApplicationFiled: March 20, 2019Publication date: October 10, 2019Inventors: Brandon J. O'Neill, Sara L. Yohe, Ajit B. Dandekar
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Publication number: 20190136734Abstract: Systems and methods are provided for performing selective catalytic reduction on engine exhaust using ethanol from the engine fuel as the reducing agent. Fuel from a fuel tank or other fuel source can be passed through a separation module to produce a fuel stream with a reduced ethanol content and an ethanol-enriched fraction. After combustion of fuel under lean conditions, the combustion exhaust can be exposed to a catalyst system in the presence of the ethanol-enriched fraction.Type: ApplicationFiled: October 29, 2018Publication date: May 9, 2019Inventors: Brian M.P. Weiss, Shamel Merchant, Randall D. Partridge, Benjamin A. McCool, Ajit B. Dandekar, Herbert W. Barry
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Patent number: 10240094Abstract: Systems and methods are provided for modifying the composition of the conversion catalyst in a reactor for oxygenate conversion during conversion of an oxygenate feed to allow for adjustment of the slate of conversion products. The modification of the conversion catalyst can be performed by introducing a substantial portion (relative to the amount of catalyst inventory in the reaction system) of make-up catalyst having a distinct composition relative to the conversion catalyst in the reaction system. Introducing the distinct composition of make-up catalyst can modify the composition of the conversion catalyst in the reactor to allow for changes in the resulting product slate. By introducing the distinct catalyst composition, the conversion catalyst in the reactor can correspond to a different composition of catalyst than the overall average catalyst composition within the catalyst inventory in the reaction system.Type: GrantFiled: January 5, 2018Date of Patent: March 26, 2019Assignee: EXXONMOBIL RESEARCH AND ENGINEERING COMPANYInventors: Brandon J. O'Neill, Stephen J. McCarthy, Mark A. Deimund, Ajit B. Dandekar
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Publication number: 20190078027Abstract: Systems and methods are provided for upgrading a heavy cracked feedstock in a single reaction stage under fixed bed hydroprocessing conditions, including exposing the feedstock to a first bulk or supported mixed metal catalyst comprising Ni and Mo; exposing the feedstock to a second bulk or supported mixed metal catalyst comprising Ni and W; and exposing the feedstock to a third catalyst comprising a zeolite-based hydrocracking catalyst.Type: ApplicationFiled: August 29, 2018Publication date: March 14, 2019Inventors: Mark A. Deimund, Samia Ilias, Randolph J. Smiley, Ajit B. Dandekar, Scott J. Weigel, Darryl D. Lacy
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Publication number: 20180282241Abstract: In a process for the catalytic alkylation of an olefin with an isoparaffin, an olefin-containing feed is contacted with an isoparaffin-containing feed under alkylation conditions in the presence of a solid acid catalyst comprising a crystalline microporous material of the MWW framework types, wherein the olefin-containing feed consists essentially of pentenes.Type: ApplicationFiled: June 7, 2018Publication date: October 4, 2018Inventors: Vinit Choudhary, Jihad Dakka, Matthew S. Mettler, Ivy D. Johnson, Joshua W. Allen, Ajit B. Dandekar, Cynthia F. Omilian
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Publication number: 20180201843Abstract: Systems and methods are provided for modifying the composition of the conversion catalyst in a reactor for oxygenate conversion during conversion of an oxygenate feed to allow for adjustment of the slate of conversion products. The modification of the conversion catalyst can be performed by introducing a substantial portion (relative to the amount of catalyst inventory in the reaction system) of make-up catalyst having a distinct composition relative to the conversion catalyst in the reaction system. Introducing the distinct composition of make-up catalyst can modify the composition of the conversion catalyst in the reactor to allow for changes in the resulting product slate. By introducing the distinct catalyst composition, the conversion catalyst in the reactor can correspond to a different composition of catalyst than the overall average catalyst composition within the catalyst inventory in the reaction system.Type: ApplicationFiled: January 5, 2018Publication date: July 19, 2018Inventors: Brandon J. O'NEILL, Stephen J. McCARTHY, Mark A. DEIMUND, Ajit B. DANDEKAR
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Publication number: 20180105761Abstract: Systems and methods are provided for producing lubricant basestocks using a process flow that includes a conversion catalyst that can provide a desired improvement in viscosity index at a reduced or minimized amount of feed conversion. An initial processing stage can be used to produce a lubricant boiling range fraction with a reduced or minimized heteroatom content. After a separation, at least a portion of the lubricant boiling range portion can be exposed to a conversion catalyst that has an effective pore size of at least 8.0 Angstroms, a total surface area of at least 200 m2/g, and/or an Alpha value of 20 or less, where the conversion catalyst includes a supported Group 8-10 noble metal. The methods can allow for increased yields of high viscosity index lubricant boiling range products from a process flow for lubricant base stock and/or blend stock production.Type: ApplicationFiled: September 26, 2017Publication date: April 19, 2018Inventors: Jason T. Calla, Ajit B. Dandekar, Scott J. Weigel, Darryl D. Lacy, Wenyih F. Lai, Sara L. Yohe
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Publication number: 20170369395Abstract: A process for the catalytic alkylation of an olefin with an isoparaffin is described in which a feed comprising at least one olefin and at least one isoparaffin is contacted with a solid acid catalyst under alkylation conditions effective for reaction between the olefin and the isoparaffin to produce an alkylated product. The solid acid catalyst comprises a crystalline microporous material of the MWW framework type, the feed comprises at least one C5+ olefin and/or at least one C5+ isoparaffin and the alkylated product comprises at least 20% wt % of C10+ branched paraffins.Type: ApplicationFiled: June 1, 2017Publication date: December 28, 2017Inventors: Jihad M. DAKKA, Matthew S. METTLER, Jeffrey M. FITT, Charles M. SMITH, Ivy D. JOHNSON, Christopher M. DEAN, Ajit B. DANDEKAR