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在101.3 k Pa压力下,采用汽液平衡釜测定了二元物系异丙醇+二甲基亚砜(DMSO)、乙酸异丙酯+DMSO和三元物系异丙醇+乙酸异丙酯+DMSO的汽液平衡数据。利用Van Ness点校验法检验以上气液平衡数据,结果表明,数据符合热力学一致性。采用NRTL、Wilson和UNIQUAC活度系数模型对二元数据进行了拟合,并进行了三元物系汽液相平衡数据预测,结果表明,回归数据和实验数据吻合良好。Wilson模型的预测结果优于NRTL和UNIQUAC模型。一定量DMSO的加入可消除异丙醇和乙酸异丙酯的共沸点,因此,DMSO可作为一种有效的萃取剂来萃取精馏分离此二元物系。然后,通过流程模拟软件Aspen Plus,使用获得的二元交互作用参数对三元系统的萃取精馏进行了模拟。讨论了在不同的操作条件(塔板数、进料位置、溶剂比和回流比)下,异丙醇和乙酸异丙酯分离的情况,得到了最适宜的操作条件。
The binary systems isopropanol + dimethylsulfoxide (DMSO), isopropyl acetate + DMSO and the ternary system isopropanol + isopropyl acetate were measured at 101.3 kPa pressure using a vapor-liquid equilibrator. + DMSO vapor-liquid equilibrium data. The Van Ness point calibration method was used to test the above gas-liquid equilibrium data and the results showed that the data were in agreement with thermodynamics. The binary data were fitted by NRTL, Wilson and UNIQUAC activity coefficient model, and the prediction of vapor-liquid equilibrium data of ternary system was carried out. The results show that the regression data are in good agreement with the experimental data. The Wilson model predicts better than the NRTL and UNIQUAC models. A certain amount of DMSO can eliminate the azeotropic point of isopropanol and isopropyl acetate, so DMSO can be used as an effective extractant to extract and separate the binary system. The extractive distillation of the ternary system was then simulated using the Aspen Plus flow simulation software using the obtained binary interaction parameters. The separation of isopropyl alcohol and isopropyl acetate under different operating conditions (plate count, feed position, solvent ratio and reflux ratio) was discussed, and the most suitable operating conditions were obtained.