Patents by Inventor Art Dahlberg

Art Dahlberg 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 conversion hydroprocessing using multiple pressure and reaction zones
    Patent number: 7531082
    Abstract: In the refining of crude oil, hydroprocessing units such as hydrotreaters and hydrocrackers are used to remove impurities such as sulfur, nitrogen, and metals from the crude oil. They are also used to convert the feed into valuable products such as naphtha, jet fuel, kerosene and diesel. The current invention provides very high to total conversion of heavy oils to products in a single high-pressure loop, using multiple reaction stages. A hot high pressure separator is located between the first and second reaction stages. Overhead from the separator is treated in a distillate upgrader, which may operate in co-current or countercurrent mode.
    Type: Grant
    Filed: March 3, 2005
    Date of Patent: May 12, 2009
    Assignee: Chevron U.S.A. Inc.
    Inventors: Ujjal K. Mukherjee, Art Dahlberg
  • High conversion hydroprocessing using multiple pressure and reaction zones
    Publication number: 20060196809
    Abstract: In the refining of crude oil, hydroprocessing units such as hydrotreaters and hydrocrackers are used to remove impurities such as sulfur, nitrogen, and metals from the crude oil. They are also used to convert the feed into valuable products such as naphtha, jet fuel, kerosene and diesel. The current invention provides very high to total conversion of heavy oils to products in a single high-pressure loop, using multiple reaction stages. A hot high pressure separator is located between the first and second reaction stages. Overhead from the separator is treated in a distillate upgrader, which may operate in co-current or countercurrent mode.
    Type: Application
    Filed: March 3, 2005
    Publication date: September 7, 2006
    Inventors: Ujjal Mukherjee, Art Dahlberg