Study on Vapor Liquid Equilibrium for C_9 Separation by Azeotropic Distillation

来源 :China Petroleum Processing & Petrochemical Technology | 被引量 : 0次 | 上传用户:quhongliangs
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In this work,ethylene glycol monomethylether(EE) was chosen as an entrainer for the azeotropic distillation of 1,3,5-trimethylbenzene+1-methyl-2-ethylbenzene system to investigate the influence of the entrainer on vapor liquid equilibrium(VLE) of this system.Three sets of binary VLE data in the system consisting of EE + 1,3,5-trimethylbenzene +1-methyl-2-ethylbenzene were measured using the Dvorak-Boublik still.The binary parameters of NRTL model were correlated by using the likelihood method.The ternary VLE data of the system were measured as well and were predicted by using the binary parameters of NRTL model.The test results indicated that the binary data passed the thermodynamic consistency tests,and the difference between the predicted values of ternary VLE and the experimental data reached the research standard for VLE data.Addition of EE had a great influence on the relative volatility between 1,3,5-trimethylbenzene and 1-methl-2-ethyl-benzene:when the ratio of solvent was 4,and the relative volatility between 1,3,5-trimethylbenzene and 1-methyl-2-ethylbenzene increased from 1.0125(without solvent addition) to 1.283. In this work, ethylene glycol monomethylether (EE) was chosen as an entrainer for the azeotropic distillation of 1,3,5-trimethylbenzene + 1-methyl-2-ethylbenzene system to investigate the influence of the entrainer on vapor liquid equilibrium (VLE) of this system.Three sets of binary VLE data in the system consisting of EE + 1,3,5-trimethylbenzene + 1-methyl-2-ethylbenzene were measured using the Dvorak-Boublik still. The binary parameters of NRTL models were correlated by using the likelihood method. The ternary VLE data of the system were measured as well and were predicted by using the binary parameters of NRTL model. The test results indicated that the binary data passed the thermodynamic consistency tests, and the difference between the predicted values ​​of ternary VLE and the experimental data reached the research standard for VLE data. Addition of EE had a great influence on the relative volatility between 1,3,5-trimethylbenzene and 1-methl-2-ethyl-benzene: when the ratio of solvent was 4, and the relative volatility between 1,3,5-trimethylbenzene and 1-methyl-2-ethylbenzene increased from 1.0125 (without solvent addition) to 1.283.
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