| Caprolactam is the important raw material in the production of nylon and engineering plastics. The simulation software Aspen Plus for chemical process is used to simulate refining process of CPL production, a modified proposal was raised, in order to save energy and reduce consumption, save raw material and reduce the loss of caprolactam.To get the precise phase equilibrium values, the experiments were executed in the plant using the actual operational material at the invariable temperature. In order to choose the thermodynamic method, the data regression system in Aspen Plus is used to regress phase equilibrium data of the benzene-water-caprolactam(ammonium sulfate), benzene-water-caprolactam(raw product), cyclohexanone-water- cyclohexanone oxime in this thesis. The thermodynamic method NRTL of every system in this process is confirmed through comparing the values of simulation with the experimental data.Secondly, each tower in the process is simulated and the better operation parameters are gotten. The results show that the data of simulation is identical with the data from plant and material balance, the simulation work is feasible. Also each tower is optimized and the operational conditions are determined.Thirdly, the simulation for whole process is conducted on the basis of each tower simulation. The results indicate that the data of simulation is identical with the data from plant and material balance, the simulation work is feasible. At the same time, the foundation of whole process optimization is laid.In the original process the caprolactam purity of inlet in 2# tower is 59.9%, that caused the high energy losing in the process. In order to achieve the purpose that less energy consumption, in this paper it was put forward that change the caprolactam purity of inlet in 2# tower in new process. Through comparing the simulation results of new refined process with the old one, it shows that the new process decreased 1669.7kg/h steam, about 1,600,000 RMB can be saved every year. |
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