Patents by Inventor Ananda K. Nagavarapu

Ananda K. Nagavarapu 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: 20210088274
    Abstract: A method and apparatus for producing liquefied natural gas (LNG) from a natural gas stream. Heavy hydrocarbons are removed from the natural gas stream in a separator to generate a bottom stream and a separated natural gas stream, which is used as a coolant in a heat exchanger to generate a pretreated natural gas stream. The pretreated natural gas stream is compressed and cooled to form a chilled pretreated natural gas stream, part of which forms a recycle stream to exchange heat with the separated natural gas stream in the heat exchanger, thereby generating a cooled recycle stream. The temperature and pressure of the cooled recycle stream are reduced. The cooled recycle stream is then separated into an overhead stream and a reflux stream, which is directed to the separator. The chilled pretreated gas stream is liquefied to form LNG.
    Type: Application
    Filed: April 17, 2020
    Publication date: March 25, 2021
    Inventors: Yijun LIU, Ananda K. NAGAVARAPU
  • Publication number: 20200206673
    Abstract: Systems and methods are provided for separation of CO2 from dilute source streams. The systems and methods for the separation can include use of contactors that correspond radial flow adsorbent modules that can allow for efficient contact of CO2-containing gas with adsorbent beds while also facilitating use of heat transfer fluids in the vicinity of the adsorbent beds to reduce or minimize temperature variations. In particular, the radial flow adsorbent beds can be alternated with regions of axial flow heat transfer conduits to provide thermal management. The radial flow structure for the adsorbent beds combined with axial flow conduits for heat transfer fluids can allow for sufficient temperature control to either a) reduce or minimize temperature variations within the adsorbent beds or b) facilitate performing the separation using temperature as a swing variable for controlling the working capacity of the adsorbent.
    Type: Application
    Filed: December 30, 2019
    Publication date: July 2, 2020
    Inventors: Narasimhan Sundaram, Patrick P. McCall, Brendon L. Keinath, Ananda K. Nagavarapu
  • Publication number: 20200064062
    Abstract: A method is disclosed for start-up of a system for liquefying a feed gas stream comprising natural gas. The system has a feed gas compression and expansion loop, and a refrigerant system comprising a primary cooling loop and a sub-cooling loop. The feed gas compression and expansion loop is started up. The refrigerant system is pressurized. Circulation in the primary cooling loop is started and established. Circulation in the sub-cooling loop is started and established. A flow rate of the feed gas stream and circulation rates of the primary cooling loop and the sub-cooling loop are ramped up.
    Type: Application
    Filed: July 30, 2019
    Publication date: February 27, 2020
    Inventors: Yijun LIU, Fritz PIERRE, JR., Ananda K. NAGAVARAPU, Xiaoli Y. WRIGHT
  • Publication number: 20190381447
    Abstract: Provided are apparatus and systems for performing a swing adsorption process. This swing adsorption process may involve passing an input feed stream through two swing adsorption systems as a purge stream to remove contaminants, such as water, from the respective adsorbent bed units. The wet purge product stream is passed to a solvent based gas treating system, which forms a wet hydrocarbon rich stream and a wet acid gas stream. Then, the wet hydrocarbon rich stream and the wet acid gas stream are passed through one of the respective swing adsorption systems to remove some of the moisture from the respective wet streams.
    Type: Application
    Filed: August 23, 2019
    Publication date: December 19, 2019
    Inventors: Robert D. Denton, Ananda K. Nagavarapu, Bruce T. Kelley, Robert A. Johnson, Bennett D. Marshall
  • Publication number: 20190381446
    Abstract: Provided are apparatus and systems for performing a swing adsorption process. This swing adsorption process may involve performing a startup mode process prior to beginning a normal operation mode process to remove contaminants from a gaseous feed stream. The startup mode process may be utilized for swing adsorption processes, such as TSA and/or PSA, which are utilized to remove one or more contaminants from a gaseous feed stream.
    Type: Application
    Filed: August 20, 2019
    Publication date: December 19, 2019
    Inventors: Ananda K. Nagavarapu, William Barnes, Bennett D. Marshall, Bruce T. Kelly, Robert A. Johnson
  • Publication number: 20190366261
    Abstract: Provided are apparatus and systems for performing a swing adsorption process. This swing adsorption process may involve passing streams through adsorbent bed units to remove contaminants, such as water, from the stream. As part of the process, the adsorbent bed unit may provide access to the adsorbent material within the adsorbent bed unit without having to remove one or more of valves, conduits and manifolds.
    Type: Application
    Filed: August 20, 2019
    Publication date: December 5, 2019
    Inventors: Robert F. Tammera, Bruce T. Kelley, Sebastian Chialvo, Ananda K. Nagavarapu, William Barnes, Tracy A. Fowler
  • Patent number: 10495379
    Abstract: A system for conditioning a sour gas feed stream for a cryogenic distillation tower. A dehydration unit separates the sour gas feed stream into a first stream including water and a feed stream. A sequential cooling assembly is coupled to both the dehydration unit and the cryogenic distillation tower. The sequential cooling assembly includes: a first stage that separates the feed stream into a partially cooled feed stream and a second stream including acid gas; a second stage that cools the partially cooled feed stream into a cooled feed stream and a third stream including acid gas; and a cooled feed stream header coupled to a cryogenic distillation tower feed inlet. The first stage, the second stage, or both send at least one of the second and third streams to a bottom section of the cryogenic distillation tower.
    Type: Grant
    Filed: January 13, 2016
    Date of Patent: December 3, 2019
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Ananda K. Nagavarapu, P. Scott Northrop, Robert D. Denton, James A. Valencia
  • Patent number: 10434458
    Abstract: Provided are apparatus and systems for performing a swing adsorption process. This swing adsorption process may involve passing an input feed stream through two swing adsorption systems as a purge stream to remove contaminants, such as water, from the respective adsorbent bed units. The wet purge product stream is passed to a solvent based gas treating system, which forms a wet hydrocarbon rich stream and a wet acid gas stream. Then, the wet hydrocarbon rich stream and the wet acid gas stream are passed through one of the respective swing adsorption systems to remove some of the moisture from the respective wet streams.
    Type: Grant
    Filed: August 7, 2017
    Date of Patent: October 8, 2019
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Robert D. Denton, Ananda K. Nagavarapu, Bruce T. Kelley, Robert A. Johnson, Bennett D. Marshall
  • Patent number: 10427088
    Abstract: Provided are apparatus and systems for performing a swing adsorption process. This swing adsorption process may involve passing streams through adsorbent bed units to remove contaminants, such as water, from the stream. As part of the process, the adsorbent bed unit may provide access to the adsorbent material within the adsorbent bed unit without having to remove one or more of valves, conduits and manifolds.
    Type: Grant
    Filed: March 6, 2017
    Date of Patent: October 1, 2019
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Robert F. Tammera, Bruce T. Kelley, Sebastian Chialvo, Ananda K. Nagavarapu, William Barnes, Tracy A. Fowler
  • Publication number: 20190262765
    Abstract: Provided are apparatus and systems for performing a swing adsorption process. This swing adsorption process may involve performing the swing adsorption process in a swing adsorption process skid. The process may be utilized for swing adsorption processes, such as TSA and/or PSA, which are utilized to remove one or more contaminants from a gaseous feed stream.
    Type: Application
    Filed: January 25, 2019
    Publication date: August 29, 2019
    Inventors: William Barnes, Ananda K. Nagavarapu
  • Patent number: 10393015
    Abstract: Methods and systems for treating a compressed gas stream. The compressed gas stream is cooled and liquids are removed therefrom to form a dry gas stream, which is chilled in a first heat exchanger. Liquids are separated therefrom, thereby producing a cold vapor stream and a liquids stream. A first part of the cold vapor stream is expanded to produce a cold two-phase fluid stream, and a second part of the cold vapor stream is cooled to form a cooled reflux stream. Various streams are fed into a separation column to produce a cold fuel gas stream and a low temperature liquids stream. The second part of the cold vapor stream is cooled by the cold fuel gas stream, which becomes a warmed fuel gas stream that is compressed and used with the low-temperature liquids stream to chill the dry gas stream and to cool the compressed gas stream.
    Type: Grant
    Filed: May 5, 2017
    Date of Patent: August 27, 2019
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Ananda K. Nagavarapu, Donald J. Victory, Robert D. Denton
  • Patent number: 10328382
    Abstract: Provided are apparatus and systems for testing the performance a swing adsorption process. This test system is integrated with an operational system that processes a feed stream to form a product stream. The test system includes a test swing adsorption system configured to perform a swing adsorption process on the test feed stream that is based on two or more streams from different locations in the operational system. Then, passing the streams from different steps to different locations in the operational system to be recycled into the operational system.
    Type: Grant
    Filed: August 22, 2017
    Date of Patent: June 25, 2019
    Assignee: ExxonMobil Upstream Research Company
    Inventors: William Barnes, Ananda K. Nagavarapu
  • Patent number: 10322365
    Abstract: Provided are apparatus and systems for performing a swing adsorption process. This swing adsorption process may involve passing streams through adsorbent bed units to remove contaminants, such as water, from the stream. As part of the process, the adsorbent bed unit may include additional space for the valves on the head of the adsorbent bed unit.
    Type: Grant
    Filed: October 4, 2016
    Date of Patent: June 18, 2019
    Assignee: ExxonMobil Upstream Reseach Company
    Inventors: Tracy A. Fowler, Shwetha Ramkumar, Jeffrey W. Frederick, Ananda K. Nagavarapu, Sebastian Chialvo, Robert F. Tammera, John W. Fulton
  • Patent number: 10293298
    Abstract: Provided are apparatus and systems for performing a swing adsorption process. This swing adsorption process may involve passing streams through adsorbent bed units to treat the pipeline quality natural gas to form a stream that complies with liquefied natural gas (LNG) specifications. The process may involve a combined TSA and PSA process, which is utilized to remove contaminants from the feed stream.
    Type: Grant
    Filed: August 10, 2016
    Date of Patent: May 21, 2019
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Bennett D. Marshall, Bruce T. Kelley, Ananda K. Nagavarapu, Harry W. Deckman, Robert A. Johnson, Shwetha Ramkumar, Russell H. Oelfke
  • Patent number: 10220345
    Abstract: Provided are apparatus and systems for performing a swing adsorption process. This swing adsorption process may involve passing streams through adsorbent bed units to remove contaminants, such as water, from the stream. As part of the process, the adsorbent bed unit is purged with a purge stream that is provided from the overhead of the demethanizer. The configuration integrates a RCTSA dehydration system with a cryogenic recovery system.
    Type: Grant
    Filed: August 10, 2016
    Date of Patent: March 5, 2019
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Ananda K. Nagavarapu, Bennett D. Marshall
  • Patent number: 10124286
    Abstract: Provided are apparatus and systems for performing a swing adsorption process. This swing adsorption process may involve passing streams through adsorbent bed units to remove contaminants, such as water, from the stream. As part of the process, the adsorbent bed unit is purged with a purge stream that is provided from the overhead of the demethanizer. The configuration integrates a PPSA dehydration system with a cryogenic recovery system.
    Type: Grant
    Filed: August 10, 2016
    Date of Patent: November 13, 2018
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Patrick D. J. McMahon, Robert A. Johnson, Shwetha Ramkumar, Russell H. Oelfke, Eugene R. Thomas, Ananda K. Nagavarapu, William Barnes
  • Patent number: 10080992
    Abstract: Provided are apparatus and systems for performing a swing adsorption process. This swing adsorption process may involve passing streams through adsorbent bed units to treat the feed stream to form a stream that complies with nitrogen rejection specifications. The process may involve using at least a portion of the nitrogen rejection process product streams as a purge for the swing adsorption process.
    Type: Grant
    Filed: August 10, 2016
    Date of Patent: September 25, 2018
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Ananda K. Nagavarapu, Ransdall K. Smith, Russell H. Oelfke
  • Patent number: 10040022
    Abstract: Provided are apparatus and systems for performing a swing adsorption process. This swing adsorption process may involve passing streams through adsorbent bed units to remove contaminants, such as water, from the stream. As part of the process, the adsorbent bed unit may include additional space for the valves of the adsorbent bed unit.
    Type: Grant
    Filed: October 4, 2016
    Date of Patent: August 7, 2018
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Tracy A. Fowler, Shwetha Ramkumar, Jeffrey W. Frederick, Ananda K. Nagavarapu, Sebastian Chialvo, Robert F. Tammera, John W. Fulton
  • Publication number: 20180085705
    Abstract: Provided are apparatus and systems for testing the performance a swing adsorption process. This test system is integrated with an operational system that processes a feed stream to form a product stream. The test system includes a test swing adsorption system configured to perform a swing adsorption process on the test feed stream that is based on two or more streams from different locations in the operational system. Then, passing the streams from different steps to different locations in the operational system to be recycled into the operational system.
    Type: Application
    Filed: August 22, 2017
    Publication date: March 29, 2018
    Inventors: William Barnes, Ananda K. Nagavarapu
  • Publication number: 20180056229
    Abstract: Provided are apparatus and systems for performing a swing adsorption process. This swing adsorption process may involve passing an input feed stream through two swing adsorption systems as a purge stream to remove contaminants, such as water, from the respective adsorbent bed units. The wet purge product stream is passed to a solvent based gas treating system, which forms a wet hydrocarbon rich stream and a wet acid gas stream. Then, the wet hydrocarbon rich stream and the wet acid gas stream are passed through one of the respective swing adsorption systems to remove some of the moisture from the respective wet streams.
    Type: Application
    Filed: August 7, 2017
    Publication date: March 1, 2018
    Inventors: Robert D. Denton, Ananda K. Nagavarapu, Bruce T. Kelley, Robert A. Johnson, Bennett D. Marshall