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采用热分析方法对离子液体催化体系中非光气法合成异氰酸酯过程,即氨基甲酸酯热裂解过程进行了系统评价.利用热重分析(TGA)快速简单的特点,对1,6-己二氨基甲酸甲酯(MHDC)热裂解过程的条件进行了优化,包括离子液体及催化剂类型筛选,催化剂用量,反应温度,反应时间等.同时,发展了Bi_2O_3/Fe_2O_3和HTi_xO_y两种高活性催化剂,并对其进行了详细的表征.此外,合成的HTi_xO_y催化剂不仅具有催化热裂解的作用,而且具有抑制副反应的作用.
The non-phosgene synthesis of isocyanates, ie carbamate pyrolysis process, was systematically evaluated by thermal analysis method in ionic liquid catalytic system.Using the rapid and simple thermal gravimetric analysis (TGA) The conditions for thermal cracking of methyl methacrylate (MHDC) were optimized, including the selection of ionic liquid and catalyst type, the amount of catalyst, the reaction temperature and the reaction time. Meanwhile, two highly active catalysts Bi_2O_3 / Fe_2O_3 and HTi_xO_y were developed. In addition, the synthesized HTi_xO_y catalyst not only has the function of catalytic pyrolysis, but also has the effect of inhibiting the side reaction.