申请人:DENG Youquan
公开号:US20110021810A1
公开(公告)日:2011-01-27
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.
本发明公开了一种通过液相催化热裂解制备异氰酸酯的方法。在该方法中,在反应-精馏热裂解反应器中,使用包括超细粉末金属氧化物催化剂和离子液体的催化剂组合物,以烷基或芳基二烷基脲或多烷基脲为反应物,在反应温度为160-220°C、绝对压力为1000-8000帕的条件下,液相热裂解反应时间为0.5-3小时,以制备相应的异氰酸酯。该发明具有热裂解温度低、目标产品产率高、反应装置相对简单、对底物具有良好的普适性(HDI、MDI、TDI、HMDI、NDI和IPDI等产率均>85%)等特点。