苯氨基甲酸甲酯热解制备苯基异氰酸酯的非等温动力学

• 作 者: 朱干宇 李会泉 邬慧雄 曹妍 柳海涛 李新涛 张琴花 唐清
• 机 构: 中国科学院过程工程研究所绿色过程工程实验室,湿法冶金清洁生产技术国家工程实验室,中国科学院研究生院,华陆工程科技有限责任公司,
• 出 处: 过程工程学报
• 发表日期: 2012年04期
• 关键词: 氨基甲酸甲酯 非等温动力学 异氰酸酯 热解 机理函数 动力学 热解过程 指前因子 反应动力学参数 热分析

采用热分析与红外联用技术对苯氨基甲酸甲酯(MPC)热解历程进行分析,结果表明,苯氨基甲酸甲酯的热解过程是一步生成苯基异氰酸酯同时释放出甲醇气体.进一步对该热解反应进行了非等温动力学研究,对MPC的热解数据采用Flynn-Wall-Ozawa法计算得到反应活化能.采用5种方法考察反应动力学参数,结果表明,MPC热解机理为相边界反应模型,机理函数为G(α)=α~(1/3),热解反应活化能E=20.52kJ/mol,指前因子lgA=2.23,动力学方程为α~(1/3)=169.82exp[20.52×10~3/(8.314T)]t.

The pyrolysis history of methyl phenyl carbamate (MPC) was analyzed by thermal analysis and infrared spectroscopy. The results showed that the pyrolysis of methyl phenyl carbamate was a one-step process to generate phenyl isocyanate and release methanol gas. The pyrolysis reaction was studied by non-isothermal kinetics, and the activation energy was calculated by the Flynn-Wall-Ozawa method on the pyrolysis data of MPC.The reaction kinetics parameters were investigated by five methods.The results showed that the MPC pyrolysis mechanism was phase boundary The kinetic model is as follows: G (α) = α ~ (1/3), activation energy of pyrolysis reaction E = 20.52kJ / mol, exponential factor lgA = 2.23, 169.82exp [20.52 × 10 ~ 3 / (8.314T)] t.