Patents by Inventor Sankar Nair

Sankar Nair 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: 20200181042
    Abstract: Para-xylene is separated from a mixture of xylenes and ethylbenzene by a separation process. An ortho-selective adsorbent is used to reduce the ortho-xylene concentration of the xylenes, prior to contact of the xylenes and ethylbenzene with a para-selective adsorbent. The stream rich in ortho-xylene may be isomerized in the liquid phase to increase the amount of para-xylene therein. The para-xylene-depleted stream may be treated in the vapor phase to remove the ethylbenzene and then subjected to isomerization in the liquid phase to produce a stream having a higher than equilibrium amount of para-xylene.
    Type: Application
    Filed: February 9, 2017
    Publication date: June 11, 2020
    Inventors: Meha RUNGTA, Robert G. TINGER, Jeevan S. ABICHANDANI, Dana L. PILLIOD, John R. PORTER, Anthony GO, Sankar NAIR, Ke ZHANG
  • Patent number: 10358401
    Abstract: Para-xylene is separated from a mixture of C8 aromatics using a simulated moving bed (SMB) adsorption process, wherein a MOF is used as an adsorbent and an alkane or alkene having 7 or less carbon atoms, such as hexane or heptane is used as desorbent. Because of the difference in boiling points of a hexane or heptane desorbent as compared to conventional desorbents such as toluene or para-diethylbenzene, less energy is required to separate hexane or heptane from C8 aromatics by distillation than the energy required to separate toluene or diethylbenzene from C8 aromatics by distillation.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: July 23, 2019
    Assignees: EXXONMOBIL CHEMICAL PATENTS INC., GEORGIA TECH RESEARCH CORPORATION
    Inventors: Meha Rungta, Jeevan S. Abichandani, Dana L. Pilliod, Robert G. Tinger, Anthony Go, Ke Zhang, Sankar Nair, Jason Gee, David Sholl
  • Publication number: 20180326398
    Abstract: Embodiments of the present disclosure provide apparatuses, methods and systems for scalable fabrication of thin, nanoporous membranes useful in industrial applications. One embodiment of the present disclosure provides a molecular separation device configured to efficiently separate molecular species. In this particular embodiment, porous hollow fibers form a supporting scaffold for synthesis of a molecular organic framework (MOF) membrane. The MOF membrane may be synthesized on the inner or outer porous hollow fiber surface as well as within the porous fiber wall. Embodiments of the present disclosure provide a variety of methods for producing the aforementioned molecular separation devices as well as methods for producing MOF membranes.
    Type: Application
    Filed: May 4, 2018
    Publication date: November 15, 2018
    Applicants: GEORGIA TECH RESEARCH CORPORATION, PHILLIPS 66 COMPANY
    Inventors: Sankar Nair, Jeffrey H. Drese, Kiwon Eum, Ryan P. Lively, Ali Rownaghi, Yash Tamhankar, Shaowei Yang
  • Publication number: 20180215684
    Abstract: Para-xylene is separated from a mixture of C8 aromatics using a simulated moving bed (SMB) adsorption process, wherein a MOF is used as an adsorbent and an alkane or alkene having 7 or less carbon atoms, such as hexane or heptane is used as desorbent. Because of the difference in boiling points of a hexane or heptane desorbent as compared to conventional desorbents such as toluene or para-diethylbenzene, less energy is required to separate hexane or heptane from C8 aromatics by distillation than the energy required to separate toluene or diethylbenzene from C8 aromatics by distillation.
    Type: Application
    Filed: July 29, 2016
    Publication date: August 2, 2018
    Inventors: Meha RUNGTA, Jeevan S. ABICHANDANI, Dana L. PILLIOD, Robert G. TINGER, Anthony GO, Ke ZHANG, Sankar NAIR, Jason GEE, David SHOLL
  • Patent number: 9994501
    Abstract: A reactor cell for measuring gas and liquid permeation is disclosed. A hollow fiber is supported by and sealed into a first hole and a second hole of the reactor module. The first and second ends of the hollow fiber are sealed with a sealing solution. Methods for making and using the reactor cell are also disclosed. As made and used, the reactor cell further comprises a molecular sieving membrane that is uniform and free of defects grown on an inner bore surface of the hollow fiber.
    Type: Grant
    Filed: March 4, 2016
    Date of Patent: June 12, 2018
    Assignee: GEORGIA TECH RESEARCH CORPORATION
    Inventors: Sankar Nair, Kiwon Eum, Christopher W. Jones, Ali Rownaghi
  • Publication number: 20180071684
    Abstract: The disclosed technology includes a membrane-based device configured to concentrate black liquor, which results from papermaking. Certain embodiments may comprise a nanofiltration membrane configured to remove lignin from black liquor, and the nanofiltration membrane may include a first macroporous polymer substrate and a first graphene oxide membrane covering the first macroporous polymer substrate. Some embodiments may comprise a reverse osmosis membrane, which may include a second macroporous polymer substrate and a second graphene oxide membrane covering the second macroporous polymer substrate.
    Type: Application
    Filed: September 12, 2017
    Publication date: March 15, 2018
    Inventors: Sankar Nair, Nikita Kevlich, Fereshteh Rashidi, Meisha Shofner, Scott Sinquefield, Zhongzhen Wang, VIII
  • Publication number: 20180056246
    Abstract: Systems, devices and methods for molecular separation including a molecular separation device comprising at least a polycrystalline metal-organic framework (MOF) and a nanocrystalline, zeolite MFI, wherein the MOF forms a polycrystalline membrane with zeolite MFI nanoparticles dispersed therein, and the MOF membrane matrix contacting and surrounding the zeolite MFI nanoparticles form a permselective nanoporous structure.
    Type: Application
    Filed: August 28, 2017
    Publication date: March 1, 2018
    Applicant: Georgia Tech Research Corporation
    Inventors: Sankar Nair, Christopher W. Jones, Fereshteh Rashidi, Ali Asghar Rownaghi
  • Patent number: 9687791
    Abstract: A reactor cell for measuring gas and liquid permeation is disclosed. The reactor cell comprises a reactor module having a reactor chamber and a cover. A first hole extends into the reactor chamber from a first surface, a second hole opposing the first hole extends into the reactor chamber from a second surface, a third hole extends into the reactor chamber from a third surface and a fourth hole opposing the third hole extends into the reactor chamber from a fourth surface. A hollow fiber is supported by and sealed into the first and second holes of the reactor module. The first and second ends of the hollow fiber are sealed with a sealing solution. Methods for making and using the reactor cell are also disclosed. As made and used, the reactor cell further comprises a molecular sieving membrane grown on an inner bore surface of the hollow fiber.
    Type: Grant
    Filed: April 1, 2014
    Date of Patent: June 27, 2017
    Assignee: GEORGIA TECH RESEARCH CORPORATION
    Inventors: Sankar Nair, Andrew J. Brown, Nicholas A. Brunelli, Christopher W. Jones
  • Publication number: 20170107237
    Abstract: Metal-organic frameworks, in particular hybrid zeolitic imidazolate frameworks (ZIFs), devices having hybrid ZIFs, and methods for preparing hybrid ZIFs are disclosed herein. In some embodiments, the method includes preparing a first solution comprising a first imidazolate and a second imidazolate, preparing a second solution comprising a metal ion, and combining the first solution and the second solution to form the hybrid ZIF.
    Type: Application
    Filed: December 27, 2016
    Publication date: April 20, 2017
    Applicant: GEORGIA TECH RESEARCH CORPORATION
    Inventors: Joshua Allen Thompson, Catherine Rose Blad, Christopher W. Jones, Sankar Nair
  • Patent number: 9527872
    Abstract: Metal-organic frameworks, in particular hybrid zeolitic imidazolate frameworks (ZIFs), devices having hybrid ZIFs, and methods for preparing hybrid ZIFs are disclosed herein. In some embodiments, the method includes preparing a first solution comprising a first imidazolate and a second imidazolate, preparing a second solution comprising a metal ion, and combining the first solution and the second solution to form the hybrid ZIF.
    Type: Grant
    Filed: January 30, 2013
    Date of Patent: December 27, 2016
    Assignee: GEORGIA TECH RESEARCH CORPORATION
    Inventors: Joshua Allen Thompson, Catherine Rose Blad, Christopher W. Jones, Sankar Nair
  • Publication number: 20160279625
    Abstract: Effect ion-exchange of an alpha-alumina supported zeolite (e.g. a MFI zeolite, an LTA zeolite or a FAU zeolite) membrane, which process comprises: a) placing the membrane, which has a first surface and a spaced apart second surface, the first and second surfaces defining therebetween the membrane, in an ion exchange apparatus such that the first surface is in contact with an ion exchange solution and the second surface is in contact with a vapor space that is connected to a source of reduced pressure; b) actuating the source of reduced pressure to create a pressure differential between the first and second membrane surfaces of at least 0.4 atmosphere (0.
    Type: Application
    Filed: April 22, 2014
    Publication date: September 29, 2016
    Inventors: Sankar Nair, Seok Jhin Kim, Yujun Liu, John G. Pendergast, Ravindra S. Dixit, Jason S. Moore
  • Publication number: 20160184798
    Abstract: A reactor cell for measuring gas and liquid permeation is disclosed. A hollow fiber is supported by and sealed into a first hole and a second hole of the reactor module. The first and second ends of the hollow fiber are sealed with a sealing solution. Methods for making and using the reactor cell are also disclosed. As made and used, the reactor cell further comprises a molecular sieving membrane that is uniform and free of defects grown on an inner bore surface of the hollow fiber.
    Type: Application
    Filed: March 4, 2016
    Publication date: June 30, 2016
    Inventors: Sankar Nair, Kiwon Eum, Christopher W. Jones, Ali Rownaghi
  • Patent number: 9375678
    Abstract: The growth of continuous MOF membranes on porous polymeric supports is reported, wherein a dip-coating procedure is used to deposit a layer of seed MOF nanocrystals on the surfaces of porous polymers, preferably in the form of hollow fibers, and polycrystalline MOF membranes are subsequently grown at temperatures as low as 65° C. from precursor solutions. The present work opens the road to inexpensive and scalable fabrication of MOF membranes for large-scale separation applications.
    Type: Grant
    Filed: May 20, 2013
    Date of Patent: June 28, 2016
    Assignee: Georgia Tech Research Corporation
    Inventors: Sankar Nair, Andrew Brown, Christopher W. Jones
  • Publication number: 20160130199
    Abstract: A method for forming a hybrid zeolitic imidazolate framework (ZIF) comprises the formation steps of: preparing a first solution comprising: a 2-methylimidazolate or a functionalized derivative thereof; and a carboxaldehyde-2-imidazolate or a functionalized derivative thereof; preparing a second solution comprising a metal ion; and combining the first solution and the second solution to form the hybrid ZIF, wherein a first fraction of 2-methylimidazolate or a functionalized derivative thereof in the hybrid ZIF is from about 5 to about 95 or any value there between and a second fraction carboxaldehyde-2-imidazolate or a functionalized derivative thereof in the hybrid ZIF is 100—the first fraction is disclosed. A metal-organic framework (MOF) comprising the hybrid ZIF and a molecular sieve device comprising the hybrid ZIF are also disclosed.
    Type: Application
    Filed: October 29, 2015
    Publication date: May 12, 2016
    Applicants: Phillips 66 Company, Georgia Tech Research Corporation
    Inventors: Sankar Nair, Kiwon Eum, Fereshteh Rashidi, Christopher W. Jones, Jeffrey H. Drese
  • Patent number: 9290381
    Abstract: Described are single-walled metal oxide nanotubes having a plurality of organic functional units or moieties bonded generally in a covalent manner to the inner wall of the single-walled nanotubes. Functionalization of the single-walled metal oxide nanotubes is performed in a single-step during synthesis of the nanotubes. The organic functional units are found dispersed throughout the length of the inner wall and not sterically hindered or contained at only the mouth or ends of the single-walled metal oxide nanotubes.
    Type: Grant
    Filed: September 10, 2014
    Date of Patent: March 22, 2016
    Assignee: Georgia Tech Research Corporation
    Inventors: Sankar Nair, Dun-Yen Kang, Nicholas A. Brunelli, Christopher W. Jones
  • Patent number: 9174842
    Abstract: The present invention discloses a nanocomposite material having single-walled aluminosilicate nanotube in polymer, a membrane comprising such nanocomposite material, and the method of making the nanocomposite material, in which the composite material has high volume fraction of well-dispersed nanotubes. A gel-phased single-walled aluminosilicate nanotube is first prepared and then mixed with a polymer matrix to yield the composite material.
    Type: Grant
    Filed: September 10, 2012
    Date of Patent: November 3, 2015
    Assignee: Georgia Tech Research Corporation
    Inventors: Sankar Nair, Dun-Yen Kang, Christopher W. Jones
  • Publication number: 20150114906
    Abstract: Described is a liquid separation device comprising a porous support structure further comprising polymeric hollow fibers; an inorganic mesoporous silica membrane disposed on the porous support structure, wherein the inorganic mesoporous silica membrane is free of defects; and wherein the inorganic mesoporous silica membrane has a network of interconnected three-dimensional pores that interconnect with the porous support structure; and wherein the inorganic mesoporous silica membrane is a silylated mesoporous membrane. Also described are methods for making and using the liquid separation device.
    Type: Application
    Filed: October 16, 2014
    Publication date: April 30, 2015
    Applicants: Phillips 66 Company, Georgia Tech Research Corporation
    Inventors: Sankar Nair, Hyung-Ju Kim, William J. Koros, Kwang-Suk Jang, Justin R. Johnson, Christopher W. Jones, Joe D. Allison, Jeffrey H. Drese
  • Publication number: 20150087852
    Abstract: Described are single-walled metal oxide nanotubes having a plurality of organic functional units or moieties bonded generally in a covalent manner to the inner wall of the single-walled nanotubes. Functionalization of the single-walled metal oxide nanotubes is performed in a single-step during synthesis of the nanotubes. The organic functional units are found dispersed throughout the length of the inner wall and not sterically hindered or contained at only the mouth or ends of the single-walled metal oxide nanotubes.
    Type: Application
    Filed: September 10, 2014
    Publication date: March 26, 2015
    Applicant: Georgia Tech Research Corporation
    Inventors: Sankar Nair, Dun-Yen Kang, Nicholas A. Brunelli, Christopher W. Jones
  • Publication number: 20140336435
    Abstract: A reactor cell for measuring gas and liquid permeation is disclosed. The reactor cell comprises a reactor module having a reactor chamber and a cover. A first hole extends into the reactor chamber from a first surface, a second hole opposing the first hole extends into the reactor chamber from a second surface, a third hole extends into the reactor chamber from a third surface and a fourth hole opposing the third hole extends into the reactor chamber from a fourth surface. A hollow fiber is supported by and sealed into the first and second holes of the reactor module. The first and second ends of the hollow fiber are sealed with a sealing solution. Methods for making and using the reactor cell are also disclosed. As made and used, the reactor cell further comprises a molecular sieving membrane grown on an inner bore surface of the hollow fiber.
    Type: Application
    Filed: April 1, 2014
    Publication date: November 13, 2014
    Applicant: Georgia Tech Research Corporation
    Inventors: Sankar NAIR, Andrew J. BROWN, Nicholas A. BRUNELLI, Christopher W. JONES
  • Patent number: 8846558
    Abstract: The present invention relates to the modification of the internal surfaces of zeolite crystals via treatment with alcohols containing at least four carbon atoms. The modified zeolites possess high thermal stability and the properties of the modified zeolites can be tailored to provide improved performance for use in separations processes.
    Type: Grant
    Filed: July 14, 2009
    Date of Patent: September 30, 2014
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Chil-Hung Cheng, Christopher Jones, Sankar Nair, Ronald R. Chance, Benjamin A. McCool, Harry W. Deckman