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芳烃-环丁砜二元体系无限稀释活度系数的 推算和应用
Calculation and application of Activity Coefficients at Infinite Dilution in Binary Systems of aromatic hydrocarbon-sulfolane
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- DOI:
- 作者:
- 熊献金
Xiong Xianjin
- 作者单位:
- 中石化洛阳工程有限公司
SINOPEC Luoyang Engineering Co., Ltd.
- 关键词:
- 无限稀释活度系数；芳烃；环丁砜；二元体系；汽—液相平衡；推算
lactivity coefficients at infinite dilution; activity coefficient equation；aromatic hydrocarbon; sulfolane；binary system; vapor-liquid phase equilibrium; calculation; application
- 摘要:
- 针对实用的成对的芳烃-环丁砜二元体系无限稀释活度系数较少、预测较困难的实际情况。文章较全面地建立了该体系汽—液相平衡实验数据库，利用该数据库系统地研究了各种活度系数方程计算无限稀释活度系数的适用性。选取数据库中各代表性体系汽—液相平衡实验数据回归了活度系数方程参数并得到了 100～45 ℃温度范围内不同芳烃-环丁砜二元体系共 12对无限稀释活度系数。这些温度下的芳烃-环丁砜二元体系成对无限稀释活度系数数据未见文献报道。其中一部分数据已用于实用的完整的芳烃抽提装置抽提蒸馏工艺流程模拟软件包的建立中。提出了一个利用恒压下较高温度范围内二元体系的汽—液相平衡数据可得到同体系较低的一恒定温度下的 1 对无限稀释活度系数的方法，所得到的 1对无限稀释活度系数可用于预测该恒定温度下的汽—液相平衡数据。针对低温下环丁砜饱和蒸汽压值小，现有计算方法难于计算准确的情况，提出了一个准确计算低温下环丁砜饱和蒸汽压的计算式，该式温度适用范围为 30～150 ℃。In response to the actual situations where the practical paired activity coefficients at infinite dilution for the aromatic hy⁃drocarbon-sulfolane binary systems was few and difficult to predict. The article comprehensively established a database for vaporliquid phase equilibrium experimental data of the aromatic hydrocarbon-sulfolane binary systems, and systematically studied the ap⁃plicability of various activity coefficient equations for calculating activity coefficients at infinite dilution using the database. The rep⁃resentative vapor-liquid phase equilibrium experimental data were selected from the database, the activity coefficient equation pa⁃rameters were regressed, a total of 12 pairs of activity coefficients infinite dilution were obtained for different aromatic hydrocarbonsulfolane binary systems within the temperature range of 100～45 ℃.The paired activity coefficients at infinite dilution of the aro⁃matic hydrocarbon-sulfolane binary system at these temperatures had not been reported in the literature and a part of the activity co⁃efficients at infinite dilution had been used in the establishment of a software package for the simulation of extractive distillation pro⁃cess in aromatics extraction unit. The article proposed a method for obtaining a pair of activity coefficients at infinite dilution at alower constant temperature of a binary system using vapor-liquid phase equilibrium data at a higher temperature range under con⁃stant pressure. The obtained pair of activity coefficients at infinite dilution can be used to predict vapor-liquid phase equilibrium da⁃ta at that constant temperature. In response to the situation where the saturated vapor pressure of sulfolane at low temperatures wassmall and existing calculation methods were difficult to calculate accurately, this article proposed an accurate calculation formulafor the saturated vapor pressure of sulfolane at low temperatures, which was applicable in the temperature range of 30～150 ℃.