离子液体(ILs)具有高稳定性、溶解性能好、可设计性、易回收等优点,尤其因高CO_(2)溶解度在碳捕集方面显示了巨大潜力。但由于ILs种类繁多且价格昂贵,依靠实验研究耗时费力,因此构建ILs体系的热力学预测模型至关重要。UNIFAC模型在ILs...离子液体(ILs)具有高稳定性、溶解性能好、可设计性、易回收等优点,尤其因高CO_(2)溶解度在碳捕集方面显示了巨大潜力。但由于ILs种类繁多且价格昂贵,依靠实验研究耗时费力,因此构建ILs体系的热力学预测模型至关重要。UNIFAC模型在ILs气体分离工艺设计与优化领域具有重要的理论价值和工程应用意义,基于此,本研究构建了应用于ILs-CO_(2)体系活度系数预测的UNIFAC模型。本文系统收集了CO_(2)在ILs中的溶解度实验数据,并结合相平衡计算出活度系数,建立了ILs-CO_(2)体系活度系数数据库。采用COSMO方法和van der Waals规则分别获得了UNIFAC模型中基团的重要参数(R_(k)和Q_(k))。基于实验值,拟合了UNIFAC相互作用参数。通过平均相对误差(AARD),比较了两种方法建立的UNIFAC模型的预测效果。结果表明:通过COSMO方法(AARD=7.68%)建立的UNIFAC模型对ILs-CO_(2)体系的活度系数预测误差比van der Waals方法(AARD=12.57%)降低了4.89个百分点。并在此基础上建立了ILs-CO_(2)体系UNIFAC模型,获得了近100对基团的相互作用参数数据库。由于UNIFAC模型的基团贡献特点,本工作建立的UNIFAC模型可预测数据库中包含的基团组成的新型ILs与CO_(2)体系的活度系数,从而为后续ILs法气体吸收的分子设计奠定了扎实基础。展开更多
Extractive distillation is an important and useful technique for separating close boiling and azeotropic liquid mixtures.Solvent selectivity is the key to achieving success.In this paper, the relation of solvent selec...Extractive distillation is an important and useful technique for separating close boiling and azeotropic liquid mixtures.Solvent selectivity is the key to achieving success.In this paper, the relation of solvent selectivity versus temperature for different mixed systems（C6H6+C6H 12+DMSO, C6H6+C6H 12+DMF,EtOH+EA+DMF+DMSO, C6H6+C6H 12+DMF+DMSO） was examined by the modified UNIFAC model,which is a well-tested method to select a solvent for extractive distillation.With increasing temperature,solvent selectivity was decreased.In addition, the influence of temperature on solvent selectivity was set forth for the first time by using the Clausius-Mosotti equation.展开更多
文摘离子液体(ILs)具有高稳定性、溶解性能好、可设计性、易回收等优点,尤其因高CO_(2)溶解度在碳捕集方面显示了巨大潜力。但由于ILs种类繁多且价格昂贵,依靠实验研究耗时费力,因此构建ILs体系的热力学预测模型至关重要。UNIFAC模型在ILs气体分离工艺设计与优化领域具有重要的理论价值和工程应用意义,基于此,本研究构建了应用于ILs-CO_(2)体系活度系数预测的UNIFAC模型。本文系统收集了CO_(2)在ILs中的溶解度实验数据,并结合相平衡计算出活度系数,建立了ILs-CO_(2)体系活度系数数据库。采用COSMO方法和van der Waals规则分别获得了UNIFAC模型中基团的重要参数(R_(k)和Q_(k))。基于实验值,拟合了UNIFAC相互作用参数。通过平均相对误差(AARD),比较了两种方法建立的UNIFAC模型的预测效果。结果表明:通过COSMO方法(AARD=7.68%)建立的UNIFAC模型对ILs-CO_(2)体系的活度系数预测误差比van der Waals方法(AARD=12.57%)降低了4.89个百分点。并在此基础上建立了ILs-CO_(2)体系UNIFAC模型,获得了近100对基团的相互作用参数数据库。由于UNIFAC模型的基团贡献特点,本工作建立的UNIFAC模型可预测数据库中包含的基团组成的新型ILs与CO_(2)体系的活度系数,从而为后续ILs法气体吸收的分子设计奠定了扎实基础。
文摘Extractive distillation is an important and useful technique for separating close boiling and azeotropic liquid mixtures.Solvent selectivity is the key to achieving success.In this paper, the relation of solvent selectivity versus temperature for different mixed systems（C6H6+C6H 12+DMSO, C6H6+C6H 12+DMF,EtOH+EA+DMF+DMSO, C6H6+C6H 12+DMF+DMSO） was examined by the modified UNIFAC model,which is a well-tested method to select a solvent for extractive distillation.With increasing temperature,solvent selectivity was decreased.In addition, the influence of temperature on solvent selectivity was set forth for the first time by using the Clausius-Mosotti equation.
