Simiulationand Optimization Of Phenyl Chlorosilane Distillation Column System&Heat Exchanger Network

Production of organic silicon materials requires high-purity organic silicon monomer,Complex components and high boiling point, the crude phenyl chlorosilane mixture made bydirect method is relatively hard to purify. The paper aims at solving the problem of thelow-purity and the high energy-consuming of the domestic phenyl chlorosilanemonomer,trying to simulate and optimize the phenyl chlorosilane monomer separationcolumn system. The research has a guidance for developing a new separation process. Themain work of this paper include:1. First,consult some information of C6H5SiCl3-(C6H5)2SiCl2binary vapor-liquidequilibrium experimental data to find if the thermo-dynamic properties method is suitable.The results show that the average deviation calculated by Wilson equations, SRK, is the smallest,while that calculated by NRTL equation is the largest. Then the thermodynamic equations wereused to calculate the density values of the pure components which was compared with theactual value, ultimately Wilson equation was made as the optimum thermodynamicmodel.2. Beacuse of the lack of physical data of phenyl chlorosilane system, so use Wilsonmethod to estimate the physical property of and C6H5SiCl3and (C6H5)2SiCl2.The dataobtained is cpincide with the convention meterial property data.3. Using the Aspen Plus large-scale simulation software to simulate and optimize theexisting process of phenyl chlorosilane, it shows that the operating parameters of eachcolumn were almost the same as the data in thereference, indicating that the selectedphysical property method is suitable for the separate system. 4. According to the nature of crude phenyl chlorosilane monomer, empirical methodeasy separation coefficient method, the annul cost function method were choosen to use inthe design of separation sequences. Then build annul cost function to calculate the annulcost of above separation sequences which were simulated and optimized,The expenseresults show that: easy separation coefficient method separation sequence has theminimum fee while empirical method separation sequence has the maximum annul cost,7.8%lower than the initial sequence.5Making the easy separate coefficient method separation sequence that has thelowest annul costs as the initial process, using tuning synthesis method to obtain fourtuning sequences, carrying on simulation for above four sequences and calculate theannual cost, the Sequence3has the lowest total annul cost, which is11.07%lower thaninitial sequence.6. Employing pinch technology to analyze the lowest annual cost separationsequence, the results show that the flows of hot and cold streams can be directly matchedby the heat integration.Compared with the original sequence, the new sequence can saveenergy consumption by45.9%and annual cost reduced by20.9%.This paper discussed a new process of phenyl chlorosilane monomer separationthrough optimizing the phenyl chlorosilane monomer sequence and operatingparameters.And through the tower system heat integration for phenyl chlorosilanemonomer separation, largely reduces the energy consumption of the separation process, itcoule take a guiding role to the energy-saving emission reduction efforts in the actualproduction of phenyl chlorosilane monomer.