The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 19, 2014
Filed:
Dec. 14, 2009
Youquan Deng, Lanzhou, CN;
Xiaoguang Guo, Lanzhou, CN;
Feng Shi, Lanzhou, CN;
Qinghua Zhang, Lanzhou, CN;
Xiangyuan MA, Lanzhou, CN;
Liujin LU, Lanzhou, CN;
Jian LI, Lanzhou, CN;
Xiong Tian, Lanzhou, CN;
Yubo MA, Lanzhou, CN;
Jianpeng Shang, Lanzhou, CN;
Xinjiang Cui, Lanzhou, CN;
Liguo L Wang, Lanzhou, CN;
Hongzhe Zhang, Lanzhou, CN;
Youquan Deng, Lanzhou, CN;
Xiaoguang Guo, Lanzhou, CN;
Feng Shi, Lanzhou, CN;
Qinghua Zhang, Lanzhou, CN;
Xiangyuan Ma, Lanzhou, CN;
Liujin Lu, Lanzhou, CN;
Jian Li, Lanzhou, CN;
Xiong Tian, Lanzhou, CN;
Yubo Ma, Lanzhou, CN;
Jianpeng Shang, Lanzhou, CN;
Xinjiang Cui, Lanzhou, CN;
Liguo L Wang, Lanzhou, CN;
Hongzhe Zhang, Lanzhou, CN;
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.