Patents by Inventor Raghu S. Narayan

Raghu S. Narayan 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).

  • Method of thawing a cryogenic unit
    Patent number: 7043938
    Abstract: A method for thawing and removing frozen material from a cryogenic separation unit such as that found in an olefin production plant comprising employing a flushing agent to thaw and remove the frozen material, purging the flushing agent with a gas, and removing residual flushing agent with a solvent that is miscible with the flushing agent and has a freezing temperature substantially lower than the flushing agent.
    Type: Grant
    Filed: September 5, 2002
    Date of Patent: May 16, 2006
    Assignee: Equistar Chemicals, LP
    Inventors: Raghu S. Narayan, Steven T. Coleman, James H. Walker
  • Synthesis gas production
    Patent number: 6780395
    Abstract: A method for forming a synthesis gas with a tailored hydrogen/carbon monoxide ratio that is optimized for use in a downstream process wherein membrane gas separation is employed to form a hydrogen rich stream and a separate synthesis gas product which has a tailored hydrogen/carbon monoxide ratio.
    Type: Grant
    Filed: May 30, 2002
    Date of Patent: August 24, 2004
    Assignee: Equistar Chemicals, LP
    Inventor: Raghu S. Narayan
  • Method of thawing a cryogenic unit
    Publication number: 20040055330
    Abstract: A method for thawing and removing frozen material from a cryogenic separation unit such as that found in an olefin production plant comprising employing a flushing agent to thaw and remove the frozen material, purging the flushing agent with a gas, and removing residual flushing agent with a solvent that is miscible with the flushing agent and has a freezing temperature substantially lower than the flushing agent.
    Type: Application
    Filed: September 5, 2002
    Publication date: March 25, 2004
    Inventors: Raghu S. Narayan, Steven T. Coleman, James H. Walker
  • Synthesis gas production
    Publication number: 20030223931
    Abstract: A method for forming a synthesis gas with a tailored hydrogen/carbon dioxide ratio that is optimized for use in one or more predetermined downstream processes wherein membrane gas separation is employed to form a hydrogen rich stream and a separate synthesis gas product which product has said tailored ratio.
    Type: Application
    Filed: May 30, 2002
    Publication date: December 4, 2003
    Inventor: Raghu S. Narayan
  • Method for removal of sulfur dioxide
    Patent number: 6096239
    Abstract: A method for removing sulfur dioxide from gas streams, comprising contacting the gas stream with an aqueous absorption liquid, transferring the liquid to another location, then mildly heating the liquid to recover the sulfur dioxide. This method allows a removal of 99.9% of the sulfur dioxide, the recovery of very pure sulfur dioxide, is resistant to upsets due to variations in the gas stream, and is cost effective.
    Type: Grant
    Filed: January 13, 1998
    Date of Patent: August 1, 2000
    Assignee: Milmac Operating Company
    Inventors: Johnson H. Y. Fung, Raghu S. Narayan, Chien Kuei Tsai
  • Method for removal of sulfur dioxide
    Patent number: 5785888
    Abstract: A method for removing sulfur dioxide from gas streams, comprising contacting the gas stream with the aqueous absorption liquid, transferring the liquid to another location, then mildly heating the liquid to recover the sulfur dioxide. This absorption liquid allows removal of 99.9% of the sulfur dioxide, the recovery of very pure sulfur dioxide, is resistant to upsets due to variations in the gas stream, and is cost effective.
    Type: Grant
    Filed: March 24, 1995
    Date of Patent: July 28, 1998
    Assignee: Milmac Operating Company
    Inventors: Chien Kuei Tsai, Johnson H. Y. Fung, Raghu S. Narayan