摘要
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 process for isocyanates via the N-substituted carbamate thermal cleavage reaction in ionic liquid based catalytic systems was investigated detailedly in virtue of thermal analysis techniques. In particular,the reaction conditions for thermal decomposition of dimethyl hexamethylene-1,6-dicar-bamate（ MHDC） was optimized using the thermal gravity analysis（ TGA）,including the type of ionic liquids as well as catalyst,amount of catalyst,reaction temperature,reaction time,and so on. Meanwhile,two novel catalysts with high activity were developed,namely,Bi_2O_3/ Fe_2O_3 and HTixOy,and a series of characterizations were also conducted. It is worth mentioning that the prepared HTixOycould not only effectively promote the thermal cleavage reaction,but also suppress the secondary reactions.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2016年第4期297-306,共10页
Journal of Molecular Catalysis(China)
基金
国家自然科学基金面上项目(批准号:21173240)~~
关键词
异氰酸酯
离子液体
催化剂
热裂解
热重分析
isocyanate
ionic liquid
catalyst
thermal cleavage
thermal gravity analysis
