石油化工Issue(10)：1182-1187,6.
镧化合物催化尿素与1，2-丙二醇合成碳酸丙烯酯
Synthesis of Propylene Carbonate from Urea and 1,2-Propylene Glycol over Lanthanum Compound Catalysts
摘要
Abstract
The catalytic activities of six lanthanum compounds for the synthesis of propylene carbonate(PC) from urea and 1,2-propylene glycol(PG) were evaluated and the effects of reaction temperature,reaction time and catalyst dosage on the PC synthesis were investigated. The reaction paths were studied by means of FTIR. Some yellow precipitant was obtained after the synthesis and then was characterized by means of XRD,TGA and elemental analysis to study the reaction mechanism. The experimental results showed that the synthesis of PC from urea and PG could be divided into two steps:firstly,urea was converted into isocyanate species,which reacted with PG to form an intermediate,2-hydroxypropyl carbamate(HPC),and then HPC was converted into PC(dynamic control step). Among these catalysts,LaCl3 exhibited the highest catalytic activity. Under the optimal reaction conditions of 160℃,3 h and catalyst dosage 2.3%(w,based on the weight of the reaction system),the urea conversion and PC yield could reach 96.9% and 94.3%,respectively. In addition,the characterization results demonstrated that LaCl3 could be dissolved in the reaction system,and a complex,La(NH3)3Cl3,formed,which was beneficial to the HPC conversion to PC.关键词
尿素/1,2-丙二醇/碳酸丙烯酯/氯化镧催化剂Key words
urea/1,2-propylene glycol/propylene carbonate/lanthanum chloride catalyst分类
化学化工引用本文复制引用
张学兰,王登峰,刘春丽,史丽燕,房强,宋宗仁..镧化合物催化尿素与1，2-丙二醇合成碳酸丙烯酯[J].石油化工,2015,(10):1182-1187,6.基金项目
中国科学院战略性先导科技专项资金项目（XDA05010108）；山东省自然科学基金项目（ZR2012BL07，ZR2012BL06， ZR2013BL019）；山东省优秀中青年科学家科研奖励基金项目（BS2011SF026）；枣庄学院国家级大学生创新创业训练计划项目（311190805，311190806）。 （）
