Patents by Inventor Dekai Shi

Dekai Shi 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).

  • Solvent refining method for isocyanate prepared by phosgene method and devices used in same
    Patent number: 9840462
    Abstract: A solvent refining method for isocyanate prepared by the phosgene method and multistage absorbing towers used in same. Solvent to be refined which contains water, iron, and/or phosgene, hydrogen chloride and other materials with color is dealt by the present method and multistage absorbing towers, which can effectively prevent a drying agent from absorbing water and hardening, partial overheating in the tower and generating channeling. Meanwhile, the pressure drop is effectively lowered. In addition, the content of water is ?50 ppm, the content of iron is ?5 ppm, the content of phosgene and hydrogen chloride is ?20 ppm, Pt—Co chroma is ?20 in the refined solvent. Therefore, the refined solvent can be used as the solvent for preparing isocyanate in the phosgene method and remarkably improve an L color of isocyanate.
    Type: Grant
    Filed: April 11, 2014
    Date of Patent: December 12, 2017
    Assignee: Wanhua Chemical Group Co., Ltd.
    Inventors: Hongke Zhang, Yu Yao, Dongke Zhao, Weiqi Hua, Bin Chen, Dekai Shi, Qinglong Chen, Dan Xu, Yang Wang, Qile Shi
  • SOLVENT REFINING METHOD FOR ISOCYANATE PREPARED BY PHOSGENE METHOD AND DEVICES USED IN SAME
    Publication number: 20170022152
    Abstract: A solvent refining method for isocyanate prepared by the phosgene method and multistage absorbing towers used in same. Solvent to be refined which contains water, iron, and/or phosgene, hydrogen chloride and other materials with color is dealt by the present method and multistage absorbing towers, which can effectively prevent a drying agent from absorbing water and hardening, partial overheating in the tower and generating channeling. Meanwhile, the pressure drop is effectively lowered. In addition, the content of water is ?50 ppm, the content of iron is ?5 ppm, the content of phosgene and hydrogen chloride is ?20 ppm, Pt—Co chroma is ?20 in the refined solvent. Therefore, the refined solvent can be used as the solvent for preparing isocyanate in the phosgene method and remarkably improve an L color of isocyanate.
    Type: Application
    Filed: April 11, 2014
    Publication date: January 26, 2017
    Applicant: Wanhua Chemical Group Co., Ltd.
    Inventors: Hongke Zhang, Yu Yao, Dongke Zhao, Weiqi Hua, Bin Chen, Dekai Shi, Qinglong Chen, Dan Xu, Yang Wang, Qile Shi