Patents by Inventor Jianguo Xu

Jianguo Xu 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).

  • High pressure feed membrane separation process
    Patent number: 5282969
    Abstract: A process is set forth for the separation of one or more, more permeable components from one or more, less permeable components in a feed stream. The process suggests three membrane separation stages in series and is suitable for high pressure feed applications.
    Type: Grant
    Filed: April 29, 1993
    Date of Patent: February 1, 1994
    Assignee: Permea, Inc.
    Inventor: Jianguo Xu
  • Hybrid air and nitrogen recycle liquefier
    Patent number: 5275003
    Abstract: The present invention relates to a process producing large quantities of liquid product via the cryogenic distillation of air wherein at least a portion of the refrigeration needs of the process is provided by expansion of the feed air. In particular, the present invention is an improved method to meet the liquid nitrogen requirements of the process and comprises elevating the discharge pressure of the nitrogen recycle compressor.
    Type: Grant
    Filed: July 20, 1992
    Date of Patent: January 4, 1994
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Rakesh Agrawal, Donald W. Woodward, Jianguo Xu
  • Multiple reboiler, double column, elevated pressure air separation cycles and their integration with gas turbines
    Patent number: 5257504
    Abstract: The present invention is a liquid nitrogen reflux means improvement capable of allowing the operation of conventional dual and triple reboiler air separation cycles at elevated pressures.
    Type: Grant
    Filed: February 18, 1992
    Date of Patent: November 2, 1993
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Rakesh Agrawal, Jianguo Xu
  • Efficient single column air separation cycle and its integration with gas turbines
    Patent number: 5251450
    Abstract: The present invention is an improvement to a process for the cryogenic distillation of air to produce both nitrogen and oxygen products carried out in a single distillation column system wherein a feed air stream is distilled thereby producing a nitrogen overhead and a liquid oxygen bottoms. The improvement is characterized in that: (a) operating the single distillation column at a pressure between 70 and 300 psia [480 and 2,070 kPa.sub.
    Type: Grant
    Filed: August 28, 1992
    Date of Patent: October 12, 1993
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Rakesh Agrawal, Jianguo Xu
  • Multiple reboiler, double column, air boosted, elevated pressure air separation cycle and its integration with gas turbines
    Patent number: 5251451
    Abstract: The present invention is a liquid nitrogen reflux means improvement capable of allowing the operation of conventional dual and triple reboiler air separation cycles at elevated pressures.
    Type: Grant
    Filed: August 28, 1992
    Date of Patent: October 12, 1993
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Jianguo Xu, Rakesh Agrawal
  • Compressed permeate sweep membrane separation process
    Patent number: 5252219
    Abstract: A process is set forth for the separation of one or more, more permeable components from one or more, less permeable components in a feed stream. The process suggests two membrane separation stages in series wherein the feed is introduced into the high pressure side of the first stage, the non-permeate stream from the first stage is introduced into the high pressure side of the second stage and wherein the permeate stream from the second stage is compressed and recycled to the low pressure side of the first stage.
    Type: Grant
    Filed: December 18, 1992
    Date of Patent: October 12, 1993
    Assignee: Permea, Inc.
    Inventor: Jianguo Xu
  • Elevated pressure air separation cycles with liquid production
    Patent number: 5165245
    Abstract: The present invention relates to an improvement to a cryogenic process for the separation of air into its constituent components. In the process, a distillation column system having at least two distillation columns, a high pressure distillation column and a low pressure column is used; these two distillation columns are in thermal communication with each other. The low pressure column of the distillation column system operates at a pressure between 9 to 75 psig and a nitrogen product is produced from the top section thereof. At least 50% of the air to the distillation column system is removed as this nitrogen product, which has a nitrogen concentration of at least 95% and is at a pressure of at least 9 psig.The improvement to the process is a series of steps which allows for the production of liquid products from the cryogenic process in an efficient manner.
    Type: Grant
    Filed: May 14, 1991
    Date of Patent: November 24, 1992
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Rakesh Agrawal, Jianguo Xu