反应耦合法制备苯氨基甲酸甲酯产物分离过程的模拟.pdf

石油化工
2010年第39卷第6期
PETROCHEMICAL TECHNOLOGY
?651
反应耦合法制备苯氨基甲酸甲酯
产物分离过程的模拟
沈鹏飞2,李会泉2,王瑶,柳海涛2
(1.大连理工大学化工学院,辽宁大连116012;
2.中国科学院过程工程研究所绿色过程工程院重点实验空,北京100190)
摘要」对碳酸二甲酯(DMC)和二苯基脲反应耦合法合成苯氨基甲酸甲酯(MPC)的产物进行分离研究;测定了MPC的热重数
据以及MPC-DMC物系的汽液平衡数据;在考虑了各组分分离特性的基础上,确定了单塔减压侧线采出工艺;采用 Aspen Plus过
程模拟软件对分离工艺进行了模拟计算。优化的操作条件为:理论塔板数为12块,进料位置为第8块塔板,側线采出位置为第4
块塔板,塔顶采出量为535.3kg/h,側线采出量为16.0kg/h,塔釜绝对压力为98.94kPa,回流比为0.12。在此条件下,分离得到
的塔顶产品中xDMc=99.6%,DMC的收率大于99.0%:塔釜产品中xwe=98.7%,MPC的收率大于99.0%
关键词」碳酸二甲酯;苯氨基甲酸甲酯;二苯基脲;反应耦合法;分离;蒸馏;模拟
文章编号]1000-8144(2010)06-0651-05
[中图分类号]TQ028[文献标识码]A
Separation Simulation of Product Methyl N-phenyl Carbamate
Obtained Through Coupled Reaction
Shen Pengfei", Li Huiguan", Wang Yao, Liu Haitao
(1. School of Chemical Engineering, Dalian University of Technology, Dalian Liaoning 116012, China; 2. Key Laboratory
for Green Process and Engineering, Institute of Process and Engineering, Chinese Academy of Sciences, Beijing 100190, China
I Abstract] Separation process for synthesis of methyl N-phenyl carbamate(MPC) from dimethyl
carbonate(DMC) and N, N'-diphenylurea through coupled reaction without phosgene was studied
Both TG-DTG curves of MPC and vapor-liquid equilibrium data of the MPC-DMC system were
determined. According to the properties of the components, the separation route of single vacuum
column with siding was designed. Optimum parameters calculated by Aspen Plus software were as
follows: number of theoretical plates 12, feed input position at the 8th plate, siding position at the 4th
plate, distillate rate 535. 5 kg/h, flow rate of side stream 16.0 kg/h, absolute pressure at bottom
98.94 kpa and reflux ratio 0. 12. The separation results were mole fraction of DMC at overhead
99. 7%o, the recovery rate of DMC more than 99. 0%, mole fraction of MPC at bottom.7% and the
recovery rate of MPC more than 99. 0%
L Keywords J dimethyl carbonate; methyl N-phenyl carbamate; N, N-diphenylurea; coupled
reaction; separation; distillation; simulation
二苯甲烷二异氰酸酯(MDI)是一类重要的有间体,目前MPC合成方法主要有苯胺氧化羰基化
机化工原料,广泛用于聚氨酯、涂料、染料和农药等法、碳酸酯法、二苯基脲法和反应耦合法等り。这
化学品的合成。目前,工业生产MDI的主要方法
是光气法,该方法存在能耗大、副产品盐酸腐蚀设『收稿日期]2010-01-17;[修改稿日期]2010-03-25。
备等问题。开发MDI非光气合成法已成为绿色化に作者简介]沈鹏飞(1986-),男,甘肃省宁县人,硕土生,电邮
学化工领域十分重要的研究课题,其中氨基甲酸酯
shenpengfei_1955@163.com。联系人:李会泉,电话010-62621355
热分解法是极具工业应用前景的方法2-
电邮hqli@home.ipc.ac.cn
[基金项目]国家科技支撑计刘重大项目课题(2006BACO2AO8);中
苯氨基甲酸甲酯(MPC)是合成MDI的重要中国科学院知识创新工程课题(KGCX2-Yw-215-2)。