Patents by Inventor Linda S. Cheng

Linda S. Cheng 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: 20200095181
    Abstract: Processes and apparatuses for producing para-xylenes are provided. The processes comprises providing a reformate stream comprising aromatic hydrocarbons to a reformate splitter to provide a reformate bottoms stream and a reformate overhead stream. A portion of the reformate bottoms stream is passed to a para-xylene separation unit for separating para-xylene, wherein the portion of the reformate bottoms stream is passed to the para-xylene separation unit without an intermediate step for removal of olefins.
    Type: Application
    Filed: November 26, 2019
    Publication date: March 26, 2020
    Inventors: Kathryn R. Bjorkman, Patrick C. Whitchurch, Rodrigo J. Lobo, Linda S. Cheng, Susan A. Somers
  • Patent number: 10519082
    Abstract: Processes and apparatuses for producing para-xylenes are provided. The processes comprises providing a reformate stream comprising aromatic hydrocarbons to a reformate splitter to provide a reformate bottoms stream and a reformate overhead stream. A portion of the reformate bottoms stream is passed to a para-xylene separation unit for separating para-xylene, wherein the portion of the reformate bottoms stream is passed to the para-xyelene separation unit without an intermediate step for removal of olefins.
    Type: Grant
    Filed: November 28, 2017
    Date of Patent: December 31, 2019
    Assignee: UOP LLC
    Inventors: Kathryn R. Bjorkman, Patrick C. Whitchurch, Rodrigo J. Lobo, Linda S. Cheng, Susan A. Somers
  • Publication number: 20190062644
    Abstract: Processes for reforming and transalkylating hydrocarbons are disclosed. A method for processing a hydrocarbon stream includes the steps of separating para-xylene from a first mixed-xylene and ethylbenzene-containing stream to produce a first non-equilibrium xylene and ethylbenzene stream and isomerizing the first non-equilibrium xylene and ethylbenzene stream to produce additional para-xylene. The method further includes transalkylating a toluene stream to produce a second mixed-xylene and ethylbenzene-containing stream, separating para-xylene from the second mixed-xylene and ethylbenzene-containing stream to produce a second non-equilibrium xylene and ethylbenzene stream, and isomerizing the second non-equilibrium xylene and ethylbenzene stream using a liquid phase isomerization process to produce additional para-xylene.
    Type: Application
    Filed: August 31, 2017
    Publication date: February 28, 2019
    Inventors: Linda S. Cheng, Ashish S. Bambal, Joseph A. Montalbano
  • Publication number: 20190062239
    Abstract: The present invention relates to a process and apparatus for dual feed para-xylene extraction heavy desorbent and light desorbent aromatics complex flow scheme. More specifically, the present invention relates to a process and apparatus for dual feed para-xylene extraction heavy desorbent and light desorbent aromatics complex flow scheme that takes advantage of the separation efficiency already achieved by toluene methylation or toluene disproportionation processes by sending the high concentration para-xylene to xylene feed to the corresponding concentration position in the para-xylene extraction unit. This enables further para-xylene separation and recovery that can be done with greater energy and capital efficiency.
    Type: Application
    Filed: August 30, 2017
    Publication date: February 28, 2019
    Inventors: Linda S. Cheng, Veronica G. Deak, Joseph A. Montalbano, Anton N. Mlinar
  • Publication number: 20190062240
    Abstract: The present invention relates to a process and apparatus for dual feed para-xylene extraction heavy desorbent and light desorbent aromatics complex flow scheme. More specifically, the present invention relates to a process and apparatus for dual feed para-xylene extraction heavy desorbent and light desorbent aromatics complex flow scheme that takes advantage of the separation efficiency already achieved by toluene methylation or toluene disproportionation processes by sending the high concentration para-xylene to xylene feed to the corresponding concentration position in the para-xylene extraction unit. This enables further para-xylene separation and recovery that can be done with greater energy and capital efficiency.
    Type: Application
    Filed: August 30, 2017
    Publication date: February 28, 2019
    Inventors: Linda S. Cheng, Veronica G. Deak, Joseph A. Montalbano, Anton N. Mlinar
  • Publication number: 20190002371
    Abstract: The present invention relates to heavy desorbent and light desorbent aromatics complex flow scheme. More particularly, this invention relates to the integration of a dual raffinate para-xylene separation process with two isomerization zones. The first isomerization zone is a liquid phase isomerization zone and the second isomerization zone is either an ethylbenzene isomerization zone, or an isomerization zone using MAPSO-31.
    Type: Application
    Filed: June 21, 2018
    Publication date: January 3, 2019
    Inventors: Linda S. Cheng, James A. Johnson, Bryan K. Glover, David S. Krimsky
  • Publication number: 20180280925
    Abstract: The present invention generally relates to binderless zeolitic adsorbents and methods for making the binderless adsorbents. More particularly, the invention relates to FAU type binderless zeolitic adsorbents and methods for making the FAU type binderless adsorbents. The FAU type binderless adsorbents may be used for xylene separation and purification in selective adsorptive separation processes using binderless zeolitic adsorbents.
    Type: Application
    Filed: June 4, 2018
    Publication date: October 4, 2018
    Inventors: Linda S. Cheng, David A. Lesch
  • Publication number: 20180280926
    Abstract: The present invention generally relates to binderless zeolitic adsorbents and methods for making the binderless adsorbents. More particularly, the invention relates to FAU type binderless zeolitic adsorbents and methods for making the FAU type binderless adsorbents. The FAU type binderless adsorbents may be used for xylene separation and purification in selective adsorptive separation processes using binderless zeolitic adsorbents.
    Type: Application
    Filed: June 4, 2018
    Publication date: October 4, 2018
    Inventors: Linda S. Cheng, David A. Lesch
  • Publication number: 20180170828
    Abstract: This present disclosure relates to processes and apparatuses for toluene methylation in an aromatics complex for producing paraxylene. More specifically, the present disclosure relates to processes and apparatuses for toluene methylation within an aromatics complex for producing paraxylene wherein an embodiment uses a riser reactor, another embodiment uses a pre-reactor producing dimethyl ether, and another embodiment uses partial regeneration of the catalyst.
    Type: Application
    Filed: December 20, 2017
    Publication date: June 21, 2018
    Inventors: Robert J. Schmidt, Feng Xu, Joseph A. Montalbano, Ling Zhou, Edwin P. Boldingh, Linda S. Cheng, John J. Senetar
  • Publication number: 20180170842
    Abstract: This present disclosure relates to processes and apparatuses for toluene methylation in an aromatics complex for producing paraxylene. More specifically, the present disclosure relates to processes and apparatuses for toluene methylation within an aromatics complex for producing paraxylene wherein an embodiment uses a riser reactor, another embodiment uses a pre-reactor producing dimethyl ether, and another embodiment uses partial regeneration of the catalyst.
    Type: Application
    Filed: December 20, 2017
    Publication date: June 21, 2018
    Inventors: Robert J. Schmidt, Feng Xu, Joseph A. Montalbano, Ling Zhou, Edwin P. Boldingh, Linda S. Cheng, John J. Senetar
  • Publication number: 20180170834
    Abstract: Processes and apparatuses for producing para-xylenes are provided. The processes comprises providing a reformate stream comprising aromatic hydrocarbons to a reformate splitter to provide a reformate bottoms stream and a reformate overhead stream. A portion of the reformate bottoms stream is passed to a para-xylene separation unit for separating para-xylene, wherein the portion of the reformate bottoms stream is passed to the para-xyelene separation unit without an intermediate step for removal of olefins.
    Type: Application
    Filed: December 19, 2017
    Publication date: June 21, 2018
    Inventors: Kathryn R. Bjorkman, Patrick C. Whitchurch, Rodrigo J. Lobo, Linda S. Cheng, Susan A. Somers
  • Publication number: 20180170840
    Abstract: Processes and apparatuses for producing para-xylenes are provided. The processes comprises providing a reformate stream comprising aromatic hydrocarbons to a reformate splitter to provide a reformate bottoms stream and a reformate overhead stream. A portion of the reformate bottoms stream is passed to a para-xylene separation unit for separating para-xylene, wherein the portion of the reformate bottoms stream is passed to the para-xyelene separation unit without an intermediate step for removal of olefins.
    Type: Application
    Filed: November 28, 2017
    Publication date: June 21, 2018
    Inventors: Kathryn R. Bjorkman, Patrick C. Whitchurch, Rodrigo J. Lobo, Linda S. Cheng, Susan A. Somers
  • Publication number: 20180170841
    Abstract: This present disclosure relates to processes and apparatuses for toluene methylation in an aromatics complex for producing paraxylene. More specifically, the present disclosure relates to processes and apparatuses for toluene methylation within an aromatics complex for producing paraxylene wherein an embodiment uses a riser reactor, another embodiment uses a pre-reactor producing dimethyl ether, and another embodiment uses partial regeneration of the catalyst.
    Type: Application
    Filed: December 20, 2017
    Publication date: June 21, 2018
    Inventors: Robert J. Schmidt, Feng Xu, Joseph A. Montalbano, Ling Zhou, Edwin P. Boldingh, Linda S. Cheng, John J. Senetar
  • Patent number: 8603434
    Abstract: A zeolitic binder-converted composition comprising (a) a zeolite X composition having at least a first zeolite X having a mean diameter not greater than 2.7 microns, and a second zeolite X, wherein the second zeolite X is obtained by converting a binder material to the second zeolite X and the binder material is in a range from 5 to 50 wt % of the zeolite X composition; and (b) an unconverted binder material content, after conversion to the second zeolite X is complete, in a range from 0 to 3 wt % of the zeolite X composition. The zeolite X composition has an average Si/Al framework mole ratio in a range from 1.0 to 1.5, and a relative LTA intensity not greater than 1.0, as determined by x-ray diffraction (XRD).
    Type: Grant
    Filed: March 22, 2012
    Date of Patent: December 10, 2013
    Assignee: UOP LLC
    Inventors: Jack E. Hurst, Linda S. Cheng, Robert W. Broach
  • Patent number: 8603433
    Abstract: A zeolite X having (a) a Si/Al framework mole ratio in a range from 1.0 to 1.5; (b) a mean diameter not greater than 2.7 microns; and (c) a relative LTA intensity not greater than 0.35, as determined by x-ray diffraction (XRD). The relative LTA intensity is calculated as 100 times the quotient of a sample LTA XRD intensity divided by a reference XRD intensity of an LTA-type zeolite material. The intensities are summed for each LTA peak with Miller indices of (2 0 0), (4 2 0), and (6 2 2) at 7.27±0.16°, 16.29±0.34° and 24.27±0.50° 2?.
    Type: Grant
    Filed: March 22, 2012
    Date of Patent: December 10, 2013
    Assignee: UOP LLC
    Inventors: Jack E. Hurst, Linda S. Cheng, Robert W. Broach
  • Patent number: 8557028
    Abstract: Binderless BaKX zeolitic adsorbents, methods for their production, and adsorptive separation using the adsorbents are provided. An adsorbent comprises a first Zeolite X having a silica to alumina molar ratio of from about 2.0 to about 3.0; a binder-converted Zeolite X wherein a ratio of the binder-converted Zeolite X to the first Zeolite X ranges from about 10:90 to about 20:80 by weight; and barium and potassium at cationic exchangeable sites within the binderless BaKX zeolitic adsorbent. Potassium ranges from about 0.9 wt % to about 1.5 wt % and barium ranges from about 30 wt % to about 34 wt % of the binderless BaKX zeolitic adsorbent.
    Type: Grant
    Filed: March 21, 2012
    Date of Patent: October 15, 2013
    Assignee: UOP LLC
    Inventors: Jack E. Hurst, Linda S. Cheng
  • Patent number: 8431764
    Abstract: A process for separating para-xylene from a mixture of C8 alkylaromatics comprises contacting the mixture of C8 alkylaromatics with a zeolitic binder-converted composition comprising (a) a zeolite X composition having at least a first zeolite X having a mean diameter not greater than 2.7 microns, and a second zeolite X, wherein the second zeolite X is obtained by converting a binder material to the second zeolite X and the binder material is in a range from 5 to 50 wt % of the zeolite X composition; and (b) an unconverted binder material content, after conversion to the second zeolite X is complete, in a range from 0 to 3 wt % of the zeolite X composition. The zeolite X composition has an average Si/Al framework mole ratio in a range from 1.0 to 1.5, and a relative LTA intensity not greater than 1.0, as determined by x-ray diffraction (XRD).
    Type: Grant
    Filed: March 22, 2012
    Date of Patent: April 30, 2013
    Assignee: UOP LLC
    Inventors: Jack E. Hurst, Linda S. Cheng, Robert W. Broach
  • Publication number: 20120264994
    Abstract: A process for separating para-xylene from a mixture of C8 alkylaromatics comprises contacting the mixture of C8 alkylaromatics with a zeolitic binder-converted composition comprising (a) a zeolite X composition having at least a first zeolite X having a mean diameter not greater than 2.7 microns, and a second zeolite X, wherein the second zeolite X is obtained by converting a binder material to the second zeolite X and the binder material is in a range from 5 to 50 wt % of the zeolite X composition; and (b) an unconverted binder material content, after conversion to the second zeolite X is complete, in a range from 0 to 3 wt % of the zeolite X composition. The zeolite X composition has an average Si/AI framework mole ratio in a range from 1.0 to 1.5, and a relative LTA intensity not greater than 1.0, as determined by x-ray diffraction (XRD).
    Type: Application
    Filed: March 22, 2012
    Publication date: October 18, 2012
    Applicant: UOP LLC
    Inventors: Jack E. Hurst, Linda S. Cheng, Robert W. Broach
  • Publication number: 20120264992
    Abstract: A zeolite X having (a) a Si/Al framework mole ratio in a range from 1.0 to 1.5; (b) a mean diameter not greater than 2.7 microns; and (c) a relative LTA intensity not greater than 0.35, as determined by x-ray diffraction (XRD). The relative LTA intensity is calculated as 100 times the quotient of a sample LTA XRD intensity divided by a reference XRD intensity of an LTA-type zeolite material. The intensities are summed for each LTA peak with Miller indices of (2 0 0), (4 2 0), and (6 2 2) at 7.27±0.16°, 16.29±0.34° and 24.27±0.50° 2?.
    Type: Application
    Filed: March 22, 2012
    Publication date: October 18, 2012
    Applicant: UOP LLC
    Inventors: Jack E. Hurst, Linda S. Cheng, Robert W. Broach
  • Publication number: 20120264993
    Abstract: A zeolitic binder-converted composition comprising (a) a zeolite X composition having at least a first zeolite X having a mean diameter not greater than 2.7 microns, and a second zeolite X, wherein the second zeolite X is obtained by converting a binder material to the second zeolite X and the binder material is in a range from 5 to 50 wt % of the zeolite X composition; and (b) an unconverted binder material content, after conversion to the second zeolite X is complete, in a range from 0 to 3 wt % of the zeolite X composition. The zeolite X composition has an average Si/Al framework mole ratio in a range from 1.0 to 1.5, and a relative LTA intensity not greater than 1.0, as determined by x-ray diffraction (XRD).
    Type: Application
    Filed: March 22, 2012
    Publication date: October 18, 2012
    Applicant: UOP LLC
    Inventors: Jack E. Hurst, Linda S. Cheng, Robert W. Broach