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针对有机硅单体混合物(甲基氯硅烷混合物)中组分较多、分离塔系复杂的特点,提出了利用有序搜索法加调优法研究其最优分离序列的方法。利用AspenPlus模拟软件中的DSTWU模块和WILSON热力学计算模型,对提出的合成序列中涉及到的各分离子问题进行初步模拟计算。将模拟结果代入相关的费用计算模型,并利用探试成本函数概念,估算不同切割位置分离序列的年总成本。以年总成本最低为目标函数,利用有序搜索法递减确定不同组分混合物的最佳切割点。结果表明,序列Ⅰ为最佳切割点分离序列。然后,以序列Ⅰ作为初始序列,提出相关的3组相邻分离序列,采用渐进调优法对其进行调优。利用AspenPlus模拟软件中的RADFRAC严格精馏计算模块对以上4组分离序列进行精确模拟计算,分别对其各塔的进料位置和回流比进行优化,将优化结果代入相关的费用计算模型,计算并比较以上4组序列的年总成本。研究结果表明,序列Ⅳ的年总成本最低,较初始序列Ⅰ的年总成本降低了2.31%,因此选择序列Ⅳ作为分离有机硅单体混合物的最优方案是合适的。
Aiming at the more components in the organosilicon monomer mixture (methylchlorosilane mixture) and the complex separation tower system, a method of using ordered search method to adjust the optimal separation sequence is proposed. The DSTWU module and WILSON thermodynamic calculation model in AspenPlus simulation software are used to carry out the preliminary simulation calculation of each sub-ion involved in the proposed synthesis sequence. The simulation results into the relevant cost calculation model, and the use of the concept of cost function test to estimate the separation of different cutting position of the annual total cost. Taking the lowest total annual cost as the objective function, the optimal cutting point of mixture of different components was determined by the orderly searching method. The results showed that sequence Ⅰ was the best cut point separation sequence. Then, using the sequence I as the initial sequence, we propose three groups of adjacent separation sequences, and then use the gradual tuning method to tune them. Accurately calculating the above four groups of separated sequences by using the RADFRAC strict distillation calculation module in AspenPlus simulation software, optimizing the feeding position and the reflux ratio of each tower respectively, substituting the optimization results into the relevant cost calculation model, calculating Compare the total annual cost of the above 4 sets of sequences. The results show that the total annual cost of sequence IV is the lowest, which is 2.31% less than the total annual cost of initial sequence I. Therefore, it is appropriate to select sequence IV as the optimal scheme to separate the organic silicon monomer mixture.