Effects of ionic liquids on the vapor-liquid equilibriumof 1,3,5-trioxane-water system at 101.3 kPa

doi:10.1016/j.cjche.2024.05.008

摘要/Abstract

摘要： Increasing the 1,3,5-trioxane (TOX) concentration in the equilibrated vapor phase of TOX-H₂O system has been recognized as a challenge for the azeotrope. Ionic liquids (ILs) were used to improve the relative volatility of TOX to H₂O and destroy the azeotrope in the TOX-H₂O system. The vapor-liquid equilibrium of TOX-H₂O system at 101.3 kPa was studied with the addition of 1-butyl-3-methylimidazolium hydrogen sulfate, 1-hexyl-3-methylimidazolium hydrogen sulfate and 1-butyl-3-methylimidazolium nitrate, respectively. The results showed that the volatility of TOX increased with the increase in IL dosage. And the volatility of water decreased with the increase in IL dosage. The relative volatility of TOX to H₂O was improved with the increase in ILs dosage. The azeotrope could be destroyed with an IL mole fraction of about 0.10. A non-random two-liquid (NRTL) model was successfully used to correlate the experimental data. The interaction parameters were obtained by fitting the experimental data with the model. The results indicated that a strong interaction existed between ILs and water. The strong interaction improved the volatility of TOX and inhibited the volatility of water, and then intensified the relative volatility of TOX to H₂O. The results showed that an ILs with strong polarity and hydrophilicity may be a potential additive to improve the TOX concentration in the equilibrated vapor phase.

关键词: 1,3,5-Trioxane, Vapor-liquid equilibrium, Ionic liquids, NRTL model

Abstract: Increasing the 1,3,5-trioxane (TOX) concentration in the equilibrated vapor phase of TOX-H₂O system has been recognized as a challenge for the azeotrope. Ionic liquids (ILs) were used to improve the relative volatility of TOX to H₂O and destroy the azeotrope in the TOX-H₂O system. The vapor-liquid equilibrium of TOX-H₂O system at 101.3 kPa was studied with the addition of 1-butyl-3-methylimidazolium hydrogen sulfate, 1-hexyl-3-methylimidazolium hydrogen sulfate and 1-butyl-3-methylimidazolium nitrate, respectively. The results showed that the volatility of TOX increased with the increase in IL dosage. And the volatility of water decreased with the increase in IL dosage. The relative volatility of TOX to H₂O was improved with the increase in ILs dosage. The azeotrope could be destroyed with an IL mole fraction of about 0.10. A non-random two-liquid (NRTL) model was successfully used to correlate the experimental data. The interaction parameters were obtained by fitting the experimental data with the model. The results indicated that a strong interaction existed between ILs and water. The strong interaction improved the volatility of TOX and inhibited the volatility of water, and then intensified the relative volatility of TOX to H₂O. The results showed that an ILs with strong polarity and hydrophilicity may be a potential additive to improve the TOX concentration in the equilibrated vapor phase.

Key words: 1,3,5-Trioxane, Vapor-liquid equilibrium, Ionic liquids, NRTL model

Fei Li, Tao Zhang, Li Lv, Wenxiang Tang, Yan Wang, Shengwei Tang. Effects of ionic liquids on the vapor-liquid equilibriumof 1,3,5-trioxane-water system at 101.3 kPa[J]. 中国化学工程学报, 2024, 73(9): 42-50.

Fei Li, Tao Zhang, Li Lv, Wenxiang Tang, Yan Wang, Shengwei Tang. Effects of ionic liquids on the vapor-liquid equilibriumof 1,3,5-trioxane-water system at 101.3 kPa[J]. Chinese Journal of Chemical Engineering, 2024, 73(9): 42-50.

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