Patents by Inventor Enquan Wang

Enquan Wang 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).

  • Patent number: 7408080
    Abstract: The present invention discloses a process for the ammoximation of carbonyl compounds, wherein a reaction in a liquid reaction system comprising a carbonyl compound, ammonia and hydrogen peroxide is carried out in the presence of a sillicon-containing catalyst, characterized in that a liquid silicon-containing assistant is added to the reaction system so that the silicon concentration in the system reaches a range of between 0.1 and 10000 ppm. In the process according to the present invention, the deactivation of catalyst due to dissolution of silicon in the catalyst can be reduced, thus lifetime of the catalyst extended and the stable operation time elongated.
    Type: Grant
    Filed: May 30, 2003
    Date of Patent: August 5, 2008
    Assignees: China Petroleum & Chemical Corporation, Research Institute of Petroleum Processing, Sinopec
    Inventors: Wei Wu, Bin Sun, Yongxiang Li, Shibiao Cheng, Enquan Wang, Shuzhong Zhang
  • Patent number: 7384882
    Abstract: The present invention discloses a process for regenerating titanium-containing catalysts, characterized in that a deactivated catalyst is treated in an acidic solution having a pH value of ?3, and then dried and calcined. The process is simple in procedure and can make the catalytic activity, selectivity and stability of the regenerated catalyst be recovered to the level of its fresh catalyst.
    Type: Grant
    Filed: May 30, 2003
    Date of Patent: June 10, 2008
    Assignees: China Petroleum & Chemical Corporation, Research Institute of Petroleum Processing, SINOPEC
    Inventors: Bin Sun, Wei Wu, Enquan Wang, Yongxiang Li, Shuzhong Zhang, Lingmin Hu
  • Publication number: 20050215810
    Abstract: The present invention discloses a process for the ammoximation of carbonyl compounds, wherein a reaction in a liquid reaction system comprising a carbonyl compound, ammonia and hydrogen peroxide is carried out in the presence of a sillicon-containing catalyst, characterized in that a liquid silicon-containing assistant is added to the reaction system so that the silicon concentration in the system reaches a range of between 0.1 and 10000 ppm. In the process according to the present invention, the deactivation of catalyst due to dissolution of silicon in the catalyst can be reduced, thus lifetime of the catalyst extended and the stable operation time elongated.
    Type: Application
    Filed: May 30, 2003
    Publication date: September 29, 2005
    Applicants: China Petroleum & Chemical Corporation, Research Institute of Petroleum Processing Sinopec
    Inventors: Wei Wu, Bin Sun, Yongxiang Li, Shibiao Cheng, Enquan Wang, Shuzhong Zhang
  • Publication number: 20030228970
    Abstract: The present invention discloses a process for regenerating titanium-containing catalysts, characterized in that a deactivated catalyst is treated in an acidic solution having a pH value of ≦3, and then dried and calcined. The process is simple in procedure and can make the catalytic activity, selectivity and stability of the regenerated catalyst be recovered to the level of its fresh catalyst.
    Type: Application
    Filed: May 30, 2003
    Publication date: December 11, 2003
    Applicants: China Petroleum & Chemical Corporation, Research Institute of Petroleum Processing Sinopec
    Inventors: Bin Sun, Wei Wu, Enquan Wang, Yongxiang Li, Shuzhong Zhang, Lingmin Hu