Patents by Inventor Xin X. Zhu

Xin X. Zhu 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: 11033853
    Abstract: A stripper off gas stream from a low pressure hydroprocessing unit may be routed to a hydrogen recovery unit to recover hydrogen. The stripper off gas stream may be scrubbed of acid gases and then compressed to hydrogen recovery pressure before it is subjected to hydrogen recovery such as in a pressure swing adsorption unit to recover high purity hydrogen.
    Type: Grant
    Filed: June 4, 2018
    Date of Patent: June 15, 2021
    Assignee: UOP LLC
    Inventors: Simmi Sood, Xin X. Zhu
  • Publication number: 20200263922
    Abstract: Embodiments of apparatuses and methods for reforming of hydrocarbons including recovery of products are provided. In one example, a method comprises separating a reforming-zone effluent into a net gas phase stream and a liquid phase hydrocarbon stream. The net gas phase stream is separated for forming an H2-rich stream and a first liquid phase hydrocarbon stream. The H2-rich stream may be contacted with an adsorbent to form an H2-ultra rich stream and a gas stream. C3/C4 hydrocarbons are absorbed from the gas stream with the liquid phase hydrocarbon stream. The gas stream may be contacted with an H2/hydrocarbon separation membrane to separate the PSA tail gas stream and form an H2-rich permeate stream and an H2 depleted non-permeate residue stream.
    Type: Application
    Filed: February 15, 2019
    Publication date: August 20, 2020
    Inventors: Thuy T. Vu, Robert E. Tsai, Xin X. Zhu, Amit Goyal, William Yanez, Sudipta K. Ghosh
  • Patent number: 10526545
    Abstract: Processes for combining the stripping sections for two different reaction zones, such as a diesel hydrotreating zone and a naphtha hydrotreating zone. The stripping section includes an air cooler, a combined overhead receiver and two different separation sections. The two separation sections may be in the same column, but be fluidically separated. Alternatively the two sections may be in different columns. A stream from the second section may be used as a reflux from the first. While a stream from the combined overhead condenser may provide a reflux for the first section.
    Type: Grant
    Filed: August 24, 2017
    Date of Patent: January 7, 2020
    Assignee: UOP LLC
    Inventors: Donald A. Eizenga, Xin X. Zhu, Richard K. Hoehn, Paul C. Steacy
  • Patent number: 10458329
    Abstract: A power generation process for use in a processing unit that includes the steps of: using a regenerator to produce a flue gas stream; removing catalyst particles from the flue gas stream; routing the flue gas stream to a combustor/expander unit after performing the step of removing catalyst particles; and using rotation of the turbine of the combustor/expander unit as a source of rotary power. Preferably, the combustor/expander unit includes a combustion chamber and a power recovery turbine housed within a single casing. In certain embodiments, the flue gas stream is routed between the regenerator and the combustor/expander without passing through a compressor.
    Type: Grant
    Filed: March 6, 2014
    Date of Patent: October 29, 2019
    Assignee: UOP LLC
    Inventors: Xin X. Zhu, Joao Jorge da Silva Ferreira Alves, Paolo Palmas, Richard A. Johnson, II, Michael R. Van de Cotte
  • Patent number: 10385279
    Abstract: A process and apparatus for recycling LCO and/or HCO to a hydroprocessing zone to saturate aromatics for cracking in an FCC unit is disclosed. The recycle cracked stream may be recycled to a downstream hydroprocessing zone to avoid a first hydroprocessing zone that is primarily for demetallizing (and desulfurizing) feed to the FCC unit.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: August 20, 2019
    Assignee: UOP LLC
    Inventors: Xin X. Zhu, Trung Pham, Selman Z. Erisken, Haiyan Wang, David X. Wu
  • Patent number: 10301560
    Abstract: A process and apparatus for two stage hydrocracking saturates aromatics from the first stage hydrocracking unit to prevent production of HPNA's. The saturated HPNA's can be hydrocracked in the second stage to minimize or eliminate purged unconverted oil to approach or obtain maximum conversion. In an aspect, the second stage hydrocracking reactor and hydrotreating reactor may be located in the same vessel.
    Type: Grant
    Filed: May 18, 2017
    Date of Patent: May 28, 2019
    Assignee: UOP LLC
    Inventors: Haiyan Wang, Richard K. Hoehn, Xin X. Zhu
  • Patent number: 10227272
    Abstract: Embodiments of methods and apparatuses for recovery of ethylene from FCC absorber off-gas comprising a heavy cut comprising ethylene, ethane and heavier hydrocarbons and a light cut comprising hydrogen, nitrogen and methane. An exemplary method includes passing the FCC absorber off-gas to an adsorption zone containing an adsorbent selective for the adsorption of the light cut, the adsorption zone adsorbing at least a portion of the light cut and recovering an adsorption zone effluent stream comprising the heavy cut. The adsorption zone effluent is passed to a demethanizer column to provide an overhead stream comprising hydrogen, nitrogen, methane, ethylene and ethane and a net bottoms stream comprising ethylene, ethane and the heavier hydrocarbons.
    Type: Grant
    Filed: October 30, 2017
    Date of Patent: March 12, 2019
    Assignee: UOP LLC
    Inventors: Xin X. Zhu, Joseph A. Montalbano
  • Patent number: 10214695
    Abstract: A process for recovering heat from the separation of hydrocarbons. The overhead vapor stream from a fractionation column is passed to a two stage heat pump compressor. The first stage of compression is used to reboil the fractionation column. The second stage is compressed and cooled passed to a separation zone. The liquid in the separation zone may be passed back to the fractionation column as secondary reflux, and/or recovered as liquid product. Heat may also be removed from the second stage. A suction drum on the first stage may be used to protect the heat pump compressor from any droplets in the overhead stream.
    Type: Grant
    Filed: July 29, 2014
    Date of Patent: February 26, 2019
    Assignee: UOP LLC
    Inventors: Stephen T. King, Adam J. Kanyuh, Xin X. Zhu
  • Patent number: 10125328
    Abstract: Processes for separating a feed stream for a combined hydrotreating zone into multiple components. The hydrotreating zone receives at least two streams from the separation, preferably a naphtha stream and a diesel stream. The two streams are treated in the hydrotreating zone and then separated into naphtha and diesel streams. In at least one embodiment, three separation columns are used. In at least one embodiment, two separation columns are used.
    Type: Grant
    Filed: September 30, 2016
    Date of Patent: November 13, 2018
    Assignee: UOP LLC
    Inventors: Donald A. Eizenga, Xin X. Zhu, Joel Kaye, David E. Bachmann
  • Publication number: 20180280863
    Abstract: A stripper off gas stream from a low pressure hydroprocessing unit may be routed to a hydrogen recovery unit to recover hydrogen. The stripper off gas stream may be scrubbed of acid gases and then compressed to hydrogen recovery pressure before it is subjected to hydrogen recovery such as in a pressure swing adsorption unit to recover high purity hydrogen.
    Type: Application
    Filed: June 4, 2018
    Publication date: October 4, 2018
    Inventors: Simmi Sood, Xin X. Zhu
  • Patent number: 10052581
    Abstract: A process for recovering a steam cracking feed from FCC absorber off-gas comprising ethylene, ethane and heavier hydrocarbons and light gases involves removing hydrogen, nitrogen, sulfur species, carbon monoxide/dioxide, methane and other impurities from the off-gas. An absorption zone is upstream of an acetylene selective hydrotreating reactor to remove sufficient hydrogen sulfide that can poison the selective hydrotreating catalyst but leave sufficient sulfur in the feed stream to prevent temperature runaway.
    Type: Grant
    Filed: September 20, 2017
    Date of Patent: August 21, 2018
    Assignee: UOP LLC
    Inventors: Joseph A. Montalbano, W. Jay Lechnick, Xin X. Zhu
  • Patent number: 10010808
    Abstract: A process and apparatus provides for blending a heavy naphtha stream with a diesel stream to increase the yield of diesel. The diesel stream is recovered separately from a kerosene stream to leave the kerosene stream undiminished. The blended diesel provides a valuable composition.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: July 3, 2018
    Assignee: UOP LLC
    Inventors: Douglas G. Stewart, James P. Glavin, Xin X. Zhu
  • Publication number: 20180119023
    Abstract: Processes for combining the stripping sections for two different reaction zones, such as a diesel hydrotreating zone and a naphtha hydrotreating zone. The stripping section includes an air cooler, a combined overhead receiver and two different separation sections. The two separation sections may be in the same column, but be fluidically separated. Alternatively the two sections may be in different columns. A stream from the second section may be used as a reflux from the first. While a stream from the combined overhead condenser may provide a reflux for the first section.
    Type: Application
    Filed: August 24, 2017
    Publication date: May 3, 2018
    Inventors: Donald A. Eizenga, Xin X. Zhu, Richard K. Hoehn, Paul C. Steacy
  • Patent number: 9937437
    Abstract: Fractionation systems utilizing a single rectifying column with a stripping column housed in the same vessel and having a uniform diameter are described. Methods of separating feed streams using the fractionation systems are also described.
    Type: Grant
    Filed: September 30, 2013
    Date of Patent: April 10, 2018
    Assignee: UOP LLC
    Inventors: Stephen T. King, Steven Kozup, Xin X. Zhu
  • Patent number: 9914891
    Abstract: Methods of maximizing diesel production are describes. The methods include providing a stream of heavy heavy naphtha; and blending the stream of heavy heavy naphtha with a diesel stream from the crude distillation zone to increase diesel production while maintaining the blended diesel stream within a specification for diesel. Various apparatus for maximizing diesel production are also described.
    Type: Grant
    Filed: November 24, 2014
    Date of Patent: March 13, 2018
    Assignee: UOP LLC
    Inventors: Jeffrey M. Bray, James P. Glavin, Daniel J. Pintar, Xin X. Zhu
  • Patent number: 9914889
    Abstract: One exemplary embodiment can be a process for treating a hydroprocessing fraction. The process can include obtaining a bottom stream from a fractionation zone, and passing at least a portion of the bottom stream to a film generating evaporator zone for separating a first stream containing less heavy polynuclear aromatic compounds than a second stream.
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: March 13, 2018
    Assignee: UOP LLC
    Inventors: Richard K. Hoehn, Soumendra Mohan Banerjee, David M. Bowman, Xin X. Zhu
  • Publication number: 20180044265
    Abstract: Embodiments of methods and apparatuses for recovery of ethylene from FCC absorber off-gas comprising a heavy cut comprising ethylene, ethane and heavier hydrocarbons and a light cut comprising hydrogen, nitrogen and methane. An exemplary method includes passing the FCC absorber off-gas to an adsorption zone containing an adsorbent selective for the adsorption of the light cut, the adsorption zone adsorbing at least a portion of the light cut and recovering an adsorption zone effluent stream comprising the heavy cut. The adsorption zone effluent is passed to a demethanizer column to provide an overhead stream comprising hydrogen, nitrogen, methane, ethylene and ethane and a net bottoms stream comprising ethylene, ethane and the heavier hydrocarbons.
    Type: Application
    Filed: October 30, 2017
    Publication date: February 15, 2018
    Inventors: Xin X. Zhu, Joseph A. Montalbano
  • Publication number: 20170362516
    Abstract: A process and apparatus for two stage hydrocracking saturates aromatics from the first stage hydrocracking unit to prevent production of HPNA's. The saturated HPNA's can be hydrocracked in the second stage to minimize or eliminate purged unconverted oil to approach or obtain maximum conversion. In an aspect, the second stage hydrocracking reactor and hydrotreating reactor may be located in the same vessel.
    Type: Application
    Filed: May 18, 2017
    Publication date: December 21, 2017
    Inventors: Haiyan Wang, Richard K. Hoehn, Xin X. Zhu
  • Patent number: 9816753
    Abstract: Embodiments of apparatuses and methods for reforming of hydrocarbons including recovery of products are provided. In one example, a method comprises separating a reforming-zone effluent to form a net gas phase stream and a liquid phase hydrocarbon stream. The net gas phase stream is compressed, partially condensed and cooled to form a partially condensed, compressed net gas phase stream. The partially condensed, compressed net gas phase stream is separated to form an intermediate gas phase stream. The intermediate gas phase stream is cooled to form a cooled intermediate gas phase stream. The liquid phase hydrocarbon stream is cooled to form a cooled liquid phase hydrocarbon stream. The cooled intermediate gas phase stream is contacted with the cooled liquid phase hydrocarbon stream to form an H2-rich stream and a cooled second intermediate liquid phase hydrocarbon stream that is enriched with C3/C4 hydrocarbons.
    Type: Grant
    Filed: May 4, 2017
    Date of Patent: November 14, 2017
    Assignee: UOP LLC
    Inventors: Robert Edison Tsai, Xin X. Zhu, Tokhanh Ngo, William Yanez, Bryan K. Glover
  • Patent number: 9815756
    Abstract: This present disclosure relates to processes and apparatuses for use of a single dividing wall distillation column for phenol fractionation. More specifically, the present disclosure relates to processes and apparatuses for phenol fractionation by combining crude acetone column and cumene-AMS column into a single dividing wall distillation column. The proper allocation of steam or water injection, chemical treatment reactor and internal liquid phase separator, the positioning of the side draw enables high yield of acetone and phenol.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: November 14, 2017
    Assignee: UOP LLC
    Inventors: Robert J. Schmidt, Charlotte Y. Fang, Russell C. Schulz, Xin X. Zhu, Scott R. Keenan, Chad A. Williams, Heather D. Tsihlis, Jose L. Miramontes, Robert E. Tsai