Separation of n-heptane and tert-butanol by ionic liquids based on COSMO-SAC model
| Autor: | Yuanyuan Shen, Ying Xu, Jun Gao, Hongru Zhang, Zhaoyou Zhu, Zhengrun Chen, Yixin Ma, Yinglong Wang, Huiyuan Li |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Liquid–liquid equilibrium
Activity coefficient TJ807-830 02 engineering and technology 010402 general chemistry 01 natural sciences Renewable energy sources chemistry.chemical_compound Non-random two-liquid model COSMO-SAC Quantum chemical calculation QH540-549.5 Hydrogen bond Heptane Ternary numeral system Ecology Renewable Energy Sustainability and the Environment Chemistry Interaction energy 021001 nanoscience & nanotechnology Ionic liquids 0104 chemical sciences Partition coefficient Bond length Ionic liquid Physical chemistry 0210 nano-technology |
| Zdroj: | Green Energy & Environment, Vol 6, Iss 3, Pp 380-391 (2021) |
| ISSN: | 2468-0257 |
| DOI: | 10.1016/j.gee.2021.02.008 |
| Popis: | In the process of liquid–liquid extraction, it is necessary to look for green solvents as extractants. Ionic liquids have been studied as extractants due to their green recyclability in recent years. The infinite dilution activity coefficients of 100 ionic liquids with a combination of 10 cations and 10 anions were calculated by COSMO-SAC model, and the σ-profiles were plotted. The distribution coefficient and separation coefficient of n-heptane + tert-butanol + ILs were determined. [OMIM] [OTF], [HMIM] [OTF] and [BMIM] [OTF] were selected as solvents for this study. The interaction energy, bond length and charge density of ionic liquids with tert-butanol were calculated by quantum chemistry calculation method. According to these results, the rationality of selected ionic liquids as extractants could be analyzed from the molecular level. At 298.15 K and 101.325 kPa, the liquid–liquid equilibrium data of the ternary system {n-heptane + tert-butanol + [OMIM] [OTF], n-heptane + tert-butanol + [BMIM] [OTF], n-heptane + tert-butanol + [HMIM] [OTF]}) were measured. The distribution coefficient and separation coefficient for judging the extraction effect were obtained. The NRTL model was used to correlate liquid–liquid equilibrium experimental data, and correlation result proved that the correlated and experimental data had a good correlation. The research on ionic liquids is of great significance to the development of green and sustainable chemical industry. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|