Patents by Inventor Alan R. English

Alan R. English 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).

  • Upper feed injector for fluidized catalytic cracking unit
    Patent number: 5540893
    Abstract: A hydrocarbon feed pipe in a fluid catalytic cracking system includes a nozzle positioned in the upper section of the riser reactor pipe. This arrangement, together with one or more feed pipes at conventional locations in the riser reactor pipe, allows for feed segregation or feed splitting processes whereby different feed flow rates and/or compositions are fed to different points in the riser reactor pipe. Feed splitting/segregating processes provide for improved product yields and product properties.
    Type: Grant
    Filed: May 16, 1991
    Date of Patent: July 30, 1996
    Assignee: Chevron U.S.A. Inc.
    Inventor: Alan R. English
  • Expedient method for altering the yield distribution from fluid catalytic cracking units
    Patent number: 5098554
    Abstract: A fluid catalytic cracking unit equipped with multiple feed injection points along the length of the riser is operated such that all of the fresh feed is charged to one of different feed injection points, depending on the ratio of light distillate (gasoline) to middle distillate (light catalytic gas oil) that is desired in the product slate. When all of the fresh feed is charged to one of the upper injection points in the riser in order to increase middle distillate yield, the unconverted slurry oil (650.degree. F.+material) can be recycled to a location below the injection point of the fresh feed so as to increase conversion to middle distillate while lowering the activity of the catalyst (via coke deposition) for single pass conversion of the fresh feed. Steam in excess of levels typically employed for dispersion is used at the bottom of the riser to lift the regenerated catalyst up to the feed injection points.
    Type: Grant
    Filed: September 26, 1990
    Date of Patent: March 24, 1992
    Assignee: Chevron Research Company
    Inventors: Ashok S. Krishna, Alan R. English, Michael F. Raterman
  • Method of suppressing sodium poisoning of cracking catalysts during fluid catalytic cracking
    Patent number: 4889617
    Abstract: A process is disclosed for passivating sodium contaminants in FCC feed using tin or tin compounds.
    Type: Grant
    Filed: March 24, 1986
    Date of Patent: December 26, 1989
    Assignee: Chevron Research Company
    Inventor: Alan R. English