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利用文献中报道的实验数据对水+正丙醇+乙二醇三元体系的NRTL二元参数进行了优化关联,结果表明,利用优化得到的参数对气液平衡数据进行预测相比于Aspen自带参数的预测,数据精度得到了较大的提高。观察拟二元x-y相图,发现在x_2’>0.15之后,添加乙二醇有利于增加正丙醇对水的相对挥发度。采用Aspen模拟了先提浓、再萃取精馏和直接萃取精馏2种不同的正丙醇提纯流程,对进料板、回流比、萃取剂和进料摩尔比等变量进行了优化,发现先提浓流程相较于不提浓流程节能约23.3%。
Based on the experimental data reported in the literature, the NRTL binary parameters of water + n-propanol + ethylene glycol ternary system were optimized and correlated. The results show that the gas-liquid equilibrium data is predicted by the optimized parameters compared with Aspen With the parameters of the forecast, data accuracy has been greatly improved. Observing the quasi-binary x-y phase diagram, it was found that the addition of ethylene glycol after x_2 ’> 0.15 favors increasing the relative volatility of n-propanol to water. Aspen was used to simulate the two different n-propanol purification processes: first enrichment, then extractive distillation and direct extractive distillation, and the variables such as feed plate, reflux ratio, extractant and feed molar ratio were optimized and found that Compared with the concentration of non-mentioning concentrated process to save energy about 23.3%.