Patents by Inventor Pei-Shing Dai

Pei-Shing Dai 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).

  • Hydrodesulfurization of cracked naphtha with low levels of olefin saturation
    Patent number: 5358633
    Abstract: Hydrodesulfurization of a cracked naphtha is effected in the presence of a transition alumina support bearing a Group VIII non-noble metal oxide and a Group VI-B metal oxide, the atom ratio of Group VIII metal to Group VI-B metal being 1-8. The process of the instant invention gives high levels of hydrodesulfurization compared to prior art magnesia-containing catalysts and lower levels of olefin saturation, and less octane reduction in the desulfurized gasoline.
    Type: Grant
    Filed: May 28, 1993
    Date of Patent: October 25, 1994
    Assignee: Texaco Inc.
    Inventors: Eugene Pei-Shing Dai, David E. Sherwood, Jr.
  • Alkylphenol synthesis using zeolites as catalysts, particularly dealuminized y-zeolites
    Patent number: 5276215
    Abstract: Disclosed is a one-step method for synthesis of alkylphenols which comprises reacting phenol with the corresponding olefin under adiabatic conditions in the presence of a zeolite catalyst, preferably a dealuminated Y-zeolite, a modified Y-zeolite, or a .beta.-zeolite.
    Type: Grant
    Filed: April 9, 1993
    Date of Patent: January 4, 1994
    Assignee: Texaco Chemical Company
    Inventors: John F. Knifton, Yu-Hwa E. Sheu, Pei-Shing Dai