Patents by Inventor Liguo L. WANG

Liguo L. 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).

  • Method for preparing isocyanates by liquid-phase thermal cracking
    Patent number: 8809574
    Abstract: The present invention discloses a method for preparing isocyanates by liquid-phase catalytic thermal cracking. In this method, in a reaction-rectification thermal cracking reactor, using a catalyst composition comprising a superfine powder metal oxide catalyst and an ionic liquid, an alkyl or aryl dialkylurethane, or multialkylurethane being a reactant is liquid-phase thermal cracked for a reaction time of 0.5-3 h under a reaction temperature of 160-220° C. and an absolute pressure of 1000-8000 Pa so as to prepare the corresponding isocyanate. The invention has the characteristics of low thermal cracking temperature, high yield of target products, relatively simple reaction apparatus and good universality for substrates (the yields of HDI, MDI, TDI, HMDI, NDI and IPDI or the like are all>85%) and the like.
    Type: Grant
    Filed: December 14, 2009
    Date of Patent: August 19, 2014
    Assignee: Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences
    Inventors: Youquan Deng, Xiaoguang Guo, Feng Shi, Qinghua Zhang, Xiangyuan Ma, Liujin Lu, Jian Li, Xiong Tian, Yubo Ma, Jianpeng Shang, Xinjiang Cui, Liguo L Wang, Hongzhe Zhang
  • METHOD FOR PREPARING ISOCYANATES BY LIQUID-PHASE THERMAL CRACKING
    Publication number: 20110021810
    Abstract: The present invention discloses a method for preparing isocyanates by liquid-phase catalytic thermal cracking. In this method, in a reaction-rectification thermal cracking reactor, using a catalyst composition comprising a superfine powder metal oxide catalyst and an ionic liquid, an alkyl or aryl dialkylurethane, or multialkylurethane being a reactant is liquid-phase thermal cracked for a reaction time of 0.5-3 h under a reaction temperature of 160-220° C. and an absolute pressure of 1000-8000 Pa so as to prepare the corresponding isocyanate. The invention has the characteristics of low thermal cracking temperature, high yield of target products, relatively simple reaction apparatus and good universality for substrates (the yields of HDI, MDI, TDI, HMDI, NDI and IPDI or the like are all >85%) and the like.
    Type: Application
    Filed: December 14, 2009
    Publication date: January 27, 2011
    Applicant: LANZHOU INSTITUTE OF CHEMICAL PHYSICS, CHINESE ACADEMY OF SCIENCES
    Inventors: Youquan DENG, Xiaoguang GUO, Feng SHI, Qinghua ZHANG, Xiangyuan MA, Liujin LU, Jian LI, Xiong TIAN, Yubo MA, Jianpeng SHANG, Xinjiang CUI, Liguo L. WANG, Hongzhe ZHANG