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The Simulation and Optimization of Methyl N-phenyl Carbamate Separation Process

Author: ShenPengFei
Tutor: WangYao；LiHuiQuan
School: Dalian University of Technology
Course: Chemical Engineering
Keywords: Phenyl carbamate Aspen Plus Distillation Simulation Optimization
CLC: TQ245.241
Type: Master's thesis
Year: 2010
Downloads: 141
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Abstract

The phenyl carbamate (MPC) is an important organic intermediates, mainly used for the preparation of pesticides, pharmaceuticals, and isocyanate chemicals. The synthesis of 4,4 benzene methane diisocyanate the ester (MDI) Clean Production MPC intermediates in the synthesis is the most crucial step is the key route different from the other routes in the the urethane thermal decomposition method. Reaction coupling method, compared with the industrial application of the process route is mainly and diphenylurea the alcoholysis two line, these two lines will be generated include MPC, including multi-component mixture, not yet reported in the literature how to separate MPC . By product of two synthetic routes to the MPC system of dimethyl carbonate (DMC) - phenyl carbamate (MPC) - nitrogen-methyl aniline (N-an) - nitrogen-nitrogen dimethylaniline (NN-AN), and The methanol (METHANOL) - aniline (AN) - phenyl carbamate (MPC), the use of chemical process simulation software Aspen Plus simulation separation. Made progress as follows: (1) determine the heat sensitivity of the MPC is the key factor restricting separated extrapolation decomposition temperature of 132.80 ° C. Determination and calculation (2) the nature of the components of the reaction product of the coupling method system: the experimental determination of the vapor-liquid equilibrium data for DMC-MPC, the use of software to calculate the vapor-liquid equilibrium data for other components. According to research to determine the physical properties of flash - side line distillation separation scheme of the twin towers, and performed a sensitivity analysis on the relevant operating parameters; optimization goal to separate the lowest energy consumption, optimize the design of the operating parameters. Under optimum separation conditions, the MPC the purity of 99.00%, and the yield of more than 99.50%. (3) the nature of the components of diphenyl urea alcoholysis product system determination and calculation: AN-MPC VLE data were measured using the software to calculate the other components of the vapor-liquid equilibrium data. Property method is based on the literature research, the flash - atmospheric and vacuum distillation the four towers separation program, and performed a sensitivity analysis on the relevant operating parameters; optimization goal to separate the lowest energy consumption for optimized design of the operating parameters. Under optimum separation conditions, the MPC the purity of 99.00%, and the yield of more than 99.50%. (4) design of the separation equipment, and the installation and commissioning; experimental separation of the product system of the device on the different processes in MPC, the experimental results show that the proposed separation process is able to achieve separation of MPC to obtain the MPG purity greater than 98.00%, the yield is greater than 99.50%. (5) compare the the separation energy consumption of different processes, treated in the same amount under the conditions of reaction coupling process unit energy consumption accounted for only 11.63% of the diphenyl urea alcoholysis process energy consumption; on non-phosgene coupling process to produce MDI route diphenyl urea (DPU) and MPC synthesis section from the design basis, process description, material balance calculations, preparation of the five aspects of public materials and process equipment technology package.

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