Patents by Inventor Weng-Keong Tang

Weng-Keong Tang 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 for preparing 2,2-bis(4-hydroxycyclohexyl)propane
    Patent number: 11905235
    Abstract: The present invention provides a method for preparing 2,2-bis(4-hydroxycyclohexyl)propane, comprising: hydrogenating a reactive solution containing 2,2-bis(4-hydroxyphenyl)propane under a hydrogen atmosphere in a reactor with catalyst within a temperature range of 80-165° C. and a pressure range of 85-110 kg/cm2 to prepare the 2,2-bis(4-hydroxycyclohexyl)propane. The method of present invention has an advantage of high yield properties and achieves mass production easily, thereby enhancing the value of the industrial application.
    Type: Grant
    Filed: June 14, 2022
    Date of Patent: February 20, 2024
    Assignee: CHINA PETROCHEMICAL DEVELOPMENT CORPORATION, TAIPEI (TAIWAN)
    Inventors: Yi-Chi Wang, Hsin-Wei Chang, Weng-Keong Tang, Chia-Hui Shen
  • METHOD FOR PREPARING 2,2-BIS(4-HYDROXYCYCLOHEXYL)PROPANE
    Publication number: 20230150903
    Abstract: The present invention provides a method for preparing 2,2-bis(4-hydroxycyclohexyl)propane, comprising: hydrogenating a reactive solution containing 2,2-bis(4-hydroxyphenyl)propane under a hydrogen atmosphere in a reactor with catalyst within a temperature range of 80-165° C. and a pressure range of 85-110 kg/cm2 to prepare the 2,2-bis(4-hydroxycyclohexyl)propane. The method of present invention has an advantage of high yield properties and achieves mass production easily, thereby enhancing the value of the industrial application.
    Type: Application
    Filed: June 14, 2022
    Publication date: May 18, 2023
    Applicant: CHINA PETROCHEMICAL DEVELOPMENT CORPORATION, TAIPEI (TAIWAN)
    Inventors: Yi-Chi WANG, Hsin-Wei CHANG, Weng-Keong TANG, Chia-Hui SHEN
  • Method for preparing 2-Cyclohexyl cyclohexanol
    Patent number: 10800721
    Abstract: Provided is a method for preparing 2-cyclohexyl cyclohexanol, including: hydrogenating a cyclohexanone dimer with hydrogen gas at a temperature ranging from 150 to 250° C. in a reactor containing a catalyst to prepare 2-cyclohexylcyclohexanol, wherein the molar ratio of the hydrogen gas and oil ranges from 1 to 25. The method has advantages of high yield properties and allows for mass production, thereby enhancing the value of the industrial application.
    Type: Grant
    Filed: February 6, 2020
    Date of Patent: October 13, 2020
    Assignee: CHINA PETROCHEMICAL DEVELOPMENT CORPORATION
    Inventors: Yi-Chi Wang, Hsin-Wei Chang, Weng-Keong Tang, Chia-Hui Shen