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采用单级循环汽液平衡釜测定混合二乙苯不同组分与溶剂之间的汽液平衡数据,计算间二乙苯与主要组分之间的相对挥发度,并与模拟结果进行对比,确定萃取精馏分离的最佳溶剂。采用Aspen Plus软件进行模拟研究,考察了理论板数、塔顶采出比、溶剂比、回流比等因素对分离过程的影响。模拟结果表明,在理论板数为80块、进料位置为第40块、塔顶采出料比为0.7:1、溶剂比为5:1及回流比为5:1的优化条件下,间二乙苯质量含量由59.00%提高到79.00%,收率达到93.73%以上。本文研究为进一步萃取和结晶提取间二乙苯提供条件。
The vapor-liquid equilibrium data between different components of mixed diethylbenzene and the solvent were determined by a single-stage circulating vapor-liquid equilibrator. The relative volatility between m-diethylbenzene and the main components was calculated and compared with the simulation results to determine Extractive distillation separation of the best solvent. Aspen Plus software was used to simulate the effect of factors such as theoretical plate number, overhead extraction ratio, solvent ratio, reflux ratio and other factors on the separation process. The simulation results show that under the optimal conditions of a theoretical plate number of 80, a feed position of 40, an extraction ratio of 0.7: 1 at the top of the column, a solvent ratio of 5: 1 and a reflux ratio of 5: 1, Diethylbenzene content increased from 59.00% to 79.00%, the yield reached 93.73%. This study provides the conditions for the further extraction and crystallization of m-diethylbenzene.