Patents by Inventor Hari Nair

Hari 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).

  • Patent number: 9409841
    Abstract: A process for producing phenol and/or cyclohexanone by cleaving cyclohexylbenzene hydroperoxide in a loop cleavage reactor comprising multiple reaction zones connected in series. In desirable embodiments, fresh cyclohexylbenzene hydroperoxide feed(s) are supplied to reaction zones the final reaction zone, and fresh acid catalyst is supplied only to the final reaction zone. In desirable embodiments, a portion of the effluent exiting the final reaction zone is recycled to the first reaction zone. Each reaction zone is equipped with a heat exchanger downstream of the feed port to extract heat generated from the cleavage reaction.
    Type: Grant
    Filed: March 24, 2014
    Date of Patent: August 9, 2016
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Jason D. Davis, Christopher L. Becker, Bryan A. Patel, John S. Coleman, Hari Nair
  • Publication number: 20160220987
    Abstract: Disclosed is a catalyst composition and its use in a process for the conversion of a feedstock containing C8+ aromatic hydrocarbons to produce light aromatic products, comprising benzene, toluene and xylene. The catalyst composition comprises a first zeolite having a constraint index of 3 to 12, a second zeolite comprising a mordenite zeolite synthesized from TEA or MTEA, at least one first metal of Group 10 of the IUPAC Periodic Table, and at least one second metal of Group 11 to 15 of the IUPAC Periodic Table, wherein said mordenite zeolite has a mesopore surface area of greater than 30 m2/g and said mordenite zeolite comprises agglomerates composed of primary crystallites, wherein said primary crystallites have an average primary crystal size as measured by TEM of less than 80 nm and an aspect ratio of less than 2.
    Type: Application
    Filed: September 30, 2015
    Publication date: August 4, 2016
    Inventors: Wenyih F. Lai, Christine N. Elia, Jane C. Cheng, Shifang L. Luo, Hari Nair, Joshua I. Cutler, Doron Levin
  • Publication number: 20160221895
    Abstract: Disclosed is a catalyst composition and its use in a process for the conversion of a feedstock containing C8+ aromatic hydrocarbons to produce light aromatic products, comprising benzene, toluene and xylene. The catalyst composition comprises a mordenite zeolite synthesized from TEA or MTEA, optionally at least one first metal of Group 10 of the IUPAC Periodic Table, and optionally at least one second metal of Group 11 to 15 of the IUPAC Periodic Table, wherein said mordenite zeolite has a mesopore surface area of greater than 30 m2/g and said mordenite zeolite comprises agglomerates composed of primary crystallites, wherein said primary crystallites have an average primary crystal size as measured by TEM of less than 80 nm and an aspect ratio of less than 2.
    Type: Application
    Filed: January 22, 2016
    Publication date: August 4, 2016
    Inventors: Wenyih F. Lai, Christine N. Elia, Jane C. Cheng, Shifang L. Luo, Hari Nair, Joshua I. Cutler, Doron Levin, Chuansheng Bai
  • Publication number: 20160221896
    Abstract: Disclosed are a catalyst system and its use in a process for the conversion of a feedstock containing C8+ aromatic hydrocarbons to produce light aromatic products, comprising benzene, toluene and xylene.
    Type: Application
    Filed: January 22, 2016
    Publication date: August 4, 2016
    Inventors: Christine N. Elia, Shifang L. Luo, Hari Nair, Wenyih F. Lai, Robert G. Tinger
  • Patent number: 9382172
    Abstract: In a process for producing cyclohexylbenzene, benzene is contacted with hydrogen in the presence of a hydroalkylation catalyst under hydroalkylation conditions effective to form a first effluent stream comprising cyclohexylbenzene, cyclohexane, and benzene. At least a portion of the cyclohexane from the first effluent stream is then contacted with hydrogen in the presence of a dehydrogenation catalyst under dehydrogenation conditions effective to convert at least some of the cyclohexane into benzene contained in a second effluent stream. At least some of the hydrogen is supplied to the process so as to contact the dehydrogenation zone (e.g., the dehydrogenation catalyst) before contacting the hydroalkylation catalyst.
    Type: Grant
    Filed: December 5, 2012
    Date of Patent: July 5, 2016
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Christopher L. Becker, James R. Lattner, Keith H. Kuechler, Hari Nair
  • Publication number: 20160176787
    Abstract: Disclosed is a transalkylation process for making an aromatic material between a light aromatic material and a heavier aromatic material in the presence of hydrogen and a transalkylation catalyst comprising a hydrogenation component and a transalkylation component. The process comprises conducting the transalkylation reaction under conditions conducive to reducing the amount of cyclic compounds in the transalkylation reaction mixture in the beginning phase of the operation that is different from the conditions after the beginning phase. The invention is useful, e.g., in transalkylation between toluene and C9+ aromatic feed materials to produce xylenes and/or benzene.
    Type: Application
    Filed: November 16, 2015
    Publication date: June 23, 2016
    Inventors: Michel Molinier, Jeffrey L. Andrews, Hari Nair
  • Patent number: 9334218
    Abstract: A cleavage process for making phenol and/or cyclohexanone, the process comprising: (A) providing a feed comprising cyclohexylbenzene hydroperoxide; (B) contacting the feed with a catalyst under cleavage reaction conditions effective to produce a cleavage effluent comprising phenol and cyclohexanone, the catalyst having a collidine uptake of at least 20 ?mol per gram of the catalyst and comprising an aluminosilicate molecular sieve of the FAU-type, an oxide binder, and a clay.
    Type: Grant
    Filed: December 6, 2013
    Date of Patent: May 10, 2016
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Kun Wang, Roberto Garcia, Terry E. Helton, Hari Nair, Charles Morris Smith
  • Publication number: 20160107970
    Abstract: In a process for producing phenol and/or cyclohexanone, cyclohexylbenzene is contacted with an oxygen-containing gas in the presence of an oxidation catalyst under oxidation conditions effective to produce an oxidation effluent comprising cyclohexylbenzene hydroperoxide. At least a portion of the oxidation effluent is then subjected to a concentrating step to produce a cleavage feed having a higher concentration of cyclohexylbenzene hydroperoxide than the oxidation effluent. A cleavage reaction mixture comprising the cleavage feed is then contacted with a solid acid catalyst in a cleavage reaction zone under conditions effective to produce a cleavage product comprising phenol and cyclohexanone.
    Type: Application
    Filed: June 4, 2014
    Publication date: April 21, 2016
    Inventors: Hari Nair, Christopher L. Becker, Jason D. Davis, Charles Morris Smith
  • Publication number: 20160102034
    Abstract: In a process for producing phenol, a cleavage feed comprising cyclohexylbenzene hydroperoxide is supplied to a cleavage reaction zone and a cleavage reaction mixture comprising the cleavage feed is contacted in the cleavage reaction zone with a solid acid catalyst under conditions effective to produce a cleavage effluent comprising phenol and cyclohexanone. The cleavage effluent is then divided into at least a cleavage product and a cleavage recycle and the cleavage recycle and a polar solvent is supplied to the cleavage reaction zone to produce the cleavage reaction mixture with the cleavage feed. Preferably, the polar solvent is combined with the cleavage recycle before being charged into the cleavage reaction zone.
    Type: Application
    Filed: June 6, 2014
    Publication date: April 14, 2016
    Inventors: Hari Nair, Christopher L. Becker, Karen S. Nimmon, James R. Lattner, Francisco M. Benitez, Charles Morris Smith
  • Publication number: 20160059224
    Abstract: A catalyst system is disclosed for producing para-xylene from a C8 hydrocarbon mixture comprising ethylbenzene and at least one xylene isomer other than para-xylene. The catalyst system comprises a first catalyst bed and a second catalyst bed. The first catalyst bed comprises a first zeolite and a rhenium hydrogenation component. The first zeolite has a constraint index from 1 to 12, an average crystal size from 0.1 to 1 micron and has been selectivated to have an ortho-xylene sorption time of greater than 1200 minutes based on its capacity to sorb 30% of the equilibrium capacity of ortho-xylene at 120° C. and an ortho-xylene partial pressure of 4.5±0.8 mm of mercury. The second catalyst bed comprises a second zeolite and a rhenium hydrogenation component. The second zeolite has a constraint index ranging from 1 to 12 and an average crystal size of less than 0.1 micron.
    Type: Application
    Filed: July 17, 2015
    Publication date: March 3, 2016
    Inventors: Jane C. Cheng, Xiaobo Zheng, Hari Nair
  • Publication number: 20160046550
    Abstract: A process for producing phenol and/or cyclohexanone by cleaving cyclohexylbenzene hydroperoxide in a loop cleavage reactor comprising multiple reaction zones connected in series. In desirable embodiments, fresh cyclohexylbenzene hydroperoxide feed(s) are supplied to reaction zones the final reaction zone, and fresh acid catalyst is supplied only to the final reaction zone. In desirable embodiments, a portion of the effluent exiting the final reaction zone is recycled to the first reaction zone. Each reaction zone is equipped with a heat exchanger downstream of the feed port to extract heat generated from the cleavage reaction.
    Type: Application
    Filed: March 24, 2014
    Publication date: February 18, 2016
    Inventors: Jason D. Davis, Christopher L. Becker, Bryan A. Patel, John S. Coleman, Hari Nair
  • Patent number: 9233890
    Abstract: Provided is a process for producing cyclohexylbenzene, in which a benzene feed stream is subjected to each of the following treatment steps: treating the feed stream with at least one adsorbent and fractionating the feed stream to remove components having a different boiling point than benzene. The treatment steps are carried out in any order and produce a treated benzene feed stream. The treated benzene feed stream is then contacted with hydrogen in the presence of a hydroalkylation catalyst in a hydroalkylation unit under conditions effective to produce a reaction product containing cyclohexylbenzene.
    Type: Grant
    Filed: July 9, 2013
    Date of Patent: January 12, 2016
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Hari Nair, Christopher L. Becker, Ryan A. Sothen, Charles Morris Smith, Tan-Jen Chen
  • Publication number: 20150291495
    Abstract: A cleavage process for making phenol and/or cyclohexanone, the process comprising: (A) providing a feed comprising cyclohexylbenzene hydroperoxide; (B) contacting the feed with a catalyst under cleavage reaction conditions effective to produce a cleavage effluent comprising phenol and cyclohexanone, the catalyst having a collidine uptake of at least 20 ?mol per gram of the catalyst and comprising an aluminosilicate molecular sieve of the FAU-type, an oxide binder, and a clay.
    Type: Application
    Filed: December 6, 2013
    Publication date: October 15, 2015
    Inventors: Kun Wang, Roberto Garcia, Terry E. Helton, Hari Nair, Charles Morris Smith
  • Publication number: 20150266795
    Abstract: Disclosed herein is a process for dehydrogenating a hydrocarbon with a dehydrogenation catalyst comprising a step of activating the catalyst precursor in a H2-containing atmosphere. A particularly advantageous activation process includes heating the catalyst precursor to a temperature in a range from 400° C. to 600° C. The process of the present disclosure is particularly advantageous for dehydrogenating cyclohexane to make benzene.
    Type: Application
    Filed: November 18, 2013
    Publication date: September 24, 2015
    Inventors: Tan-Jen Chen, Christopher L. Becker, Hari Nair, Francisco M. Benitez, Charles Morris Smith
  • Publication number: 20150251986
    Abstract: In a process for producing phenol and cyclohexanone, a cleavage feed containing greater than 40 wt % and no greater than 95 wt % cyclohexyl-1-phenyl-1-hydroperoxide, and at least 5 wt % and less than 60 wt % cyclohexylbenzene is mixed with at least phenol, cyclohexanone, water, and sulfuric acid to produce a cleavage reaction mixture containing from 15 wt % to 50 wt % phenol, from 15 wt % to 50 wt % cyclohexanone, from 1 wt % to 10 wt % cyclohexyl-1-phenyl-1-hydroperoxide, from 5 wt % to 60 wt % cyclohexylbenzene, from 0.1 wt % to 4 wt % water, and from 10 wppm to 1000 wppm sulfuric acid. The cleavage reaction mixture is then reacted at a temperature from 30° C. and to 70° C., and a pressure of at least 1 atmosphere for a time sufficient to convert at least 50% of said cyclohexyl-1-phenyl-1-hydroperoxide in said cleavage reaction mixture and produce a cleavage effluent containing phenol and cyclohexanone.
    Type: Application
    Filed: November 13, 2013
    Publication date: September 10, 2015
    Inventors: Keith H. Kuechler, Charles Morris Smith, Francisco M. Benitez, Kun Wang, Hari Nair, Travis A. Reine, Gabor Kiss, Roberto Garcia, Christopher L. Becker
  • Patent number: 9115105
    Abstract: In a process for producing propylene oxide, cyclohexylbenzene is contacted with an oxygen-containing compound under oxidation conditions with or without a suitable catalyst to produce an oxidation reaction effluent comprising cyclohexylbenzene hydroperoxide. At least a portion of the cyclohexylbenzene hydroperoxide is then reacted with propylene in the presence of an epoxidation catalyst under conditions effective to produce an epoxidation reaction effluent comprising phenylcyclohexanol and propylene oxide.
    Type: Grant
    Filed: August 30, 2012
    Date of Patent: August 25, 2015
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Hari Nair, Charles Morris Smith, James R. Lattner, Krystle J. Chavez, James C. Vartuli
  • Patent number: 9108893
    Abstract: In a process for producing cyclohexylbenzene, hydrogen, and benzene are contacted in a first reaction zone under conditions effective to produce a product effluent containing residual benzene in the vapor phase and cyclohexylbenzene in the liquid phase. The product effluent is separated into a first stream that is rich in residual benzene in the vapor phase as compared to the product effluent and a second stream that is rich in cyclohexylbenzene in the liquid phase as compared to the product effluent. At least a portion of the first stream is cooled to condense at least a portion of the residual benzene in the vapor phase to the liquid phase and produce a condensate stream. At least a portion of the condensate stream is recycled to the first reaction zone.
    Type: Grant
    Filed: September 5, 2012
    Date of Patent: August 18, 2015
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Hari Nair, Christopher L. Becker, James R. Lattner, Jihad M. Dakka
  • Patent number: 9090528
    Abstract: In a process for producing phenol, benzene is hydroalkylated with hydrogen in the presence of a catalyst under conditions effective to produce a hydroalkylation reaction product comprising cyclohexylbenzene and cyclohexane. At least a portion of the cyclohexane from said hydroalkylation reaction product is then dehydrogenated to produce a dehydrogenation effluent comprising benzene, toluene and hydrogen. At least a portion of the dehydrogenation effluent is washed with a benzene-containing stream to transfer at least a portion of the toluene from the dehydrogenation effluent to the benzene-containing stream.
    Type: Grant
    Filed: November 30, 2012
    Date of Patent: July 28, 2015
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Christopher L. Becker, James R. Lattner, Keith H. Kuechler, Hari Nair
  • Publication number: 20150158788
    Abstract: Provided is a process for producing cyclohexylbenzene, in which a benzene feed stream is subjected to each of the following treatment steps: treating the feed stream with at least one adsorbent and fractionating the feed stream to remove components having a different boiling point than benzene. The treatment steps are carried out in any order and produce a treated benzene feed stream. The treated benzene feed stream is then contacted with hydrogen in the presence of a hydroalkylation catalyst in a hydroalkylation unit under conditions effective to produce a reaction product containing cyclohexylbenzene.
    Type: Application
    Filed: July 9, 2013
    Publication date: June 11, 2015
    Inventors: Hari Nair, Christopher L. Becker, Ryan A. Sothen, Charles Morris Smith, Tan-Jen Chen
  • Patent number: 9029611
    Abstract: In a process for the dehydrogenation of cyclohexanone to produce phenol, a feed comprising cyclohexanone is contacted with a dehydrogenation catalyst under dehydrogenation conditions comprising a temperature of less than 400° C. and a pressure of less than 690 kPa, gauge, such 0.1 to 50 wt % of the cyclohexanone in said feed is converted to phenol and the dehydrogenation product contains less than 100 ppm by weight of alkylbenzenes.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: May 12, 2015
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Teng Xu, Jihad M. Dakka, Christopher L. Becker, Keith H. Kuechler, Francisco M. Benitez, Charles M. Smith, Hari Nair