Patents by Inventor Andrew An-Ju Chen

Andrew An-Ju Chen 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 presulfurizing a hydrotreating, hydrocracking or tail gas treating catalyst
    Patent number: 5688736
    Abstract: The invention relates to an improved method of presulfurizing a sulfidable metal oxide(s)-containing catalyst which minimizes sulfur stripping upon start-up of a reactor and improves catalyst activity. The method consists of contacting a sulfidable metal oxide(s)-containing catalyst with elemental sulfur at a temperature such that said elemental sulfur is substantially incorporated in the pores of said catalyst by sublimation and/or melting and heating the sulfur-incorporated catalyst in the presence of a liquid olefinic hydrocarbon at a temperature greater than about 150.degree. C.
    Type: Grant
    Filed: October 26, 1995
    Date of Patent: November 18, 1997
    Assignee: CRI International, Inc.
    Inventors: James Dallas Seamans, Charles Terrell Adams, Wendy Beth Dominguez, Andrew An-Ju Chen