Patents by Inventor Tongshun Wang

Tongshun 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).

  • Process for purification of DMT by film crystallization
    Patent number: 5542372
    Abstract: This invention relates to a single crystallization process for purification of dimethyl terephtalate (DMT) by film crystallization, including pumping the raw DMT into a film crystallizer and reducing its temperature to form DMT crystalline on the walls of the crystallizing pipes in the crystallizer, and then heating the crystallizing pipes and collecting the melt at 140.degree.-145.degree. C. The product DMT is thus obtained.
    Type: Grant
    Filed: November 10, 1994
    Date of Patent: August 6, 1996
    Assignee: Tianjin Petro-Chemical Corporation
    Inventors: Xujiang Sun, Junmin Zhang, Tongshun Wang, Jun Zhang, Hong Su, Hongxia Xia