SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2019, Vol. 27 ›› Issue (11): 2675-2686.DOI: 10.1016/j.cjche.2018.11.009

• Separation Science and Engineering • 上一篇    下一篇

Separation of m-cresol from aromatic hydrocarbon and alkane using ionic liquids via hydrogen bond interaction

Qian Liu1, Xianglan Zhang1, Wei Li2   

  1. 1 School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China;
    2 School of Chemical Engineering, Beijing Institute of Petro-Chemical Technology, Beijing 102600, China
  • 收稿日期:2018-07-31 修回日期:2018-10-12 出版日期:2019-11-28 发布日期:2020-01-19
  • 通讯作者: Xianglan Zhang
  • 基金资助:
    Supported by the National Key Projects for Fundamental Research and Development of China (2016YFB0600305).

Separation of m-cresol from aromatic hydrocarbon and alkane using ionic liquids via hydrogen bond interaction

Qian Liu1, Xianglan Zhang1, Wei Li2   

  1. 1 School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China;
    2 School of Chemical Engineering, Beijing Institute of Petro-Chemical Technology, Beijing 102600, China
  • Received:2018-07-31 Revised:2018-10-12 Online:2019-11-28 Published:2020-01-19
  • Contact: Xianglan Zhang
  • Supported by:
    Supported by the National Key Projects for Fundamental Research and Development of China (2016YFB0600305).

摘要: Low temperature coal tar contained a large amount of phenols, aromatic hydrocarbons and alkanes; the separation of phenols from coal tar has a great significance to the deep processing of coal tar. In this work, the separation of m-cresol from cumene and n-heptane by liquid-liquid extraction using ionic liquids (ILs) as extractants was studied. The suitable ILs were screened by conductor-like screening model for real solvents (COSMO-RS) model and the liquid-liquid phase equilibrium (LLE) experiments were to verify the accuracy of the screening results. The extraction conditions such as extraction time, extraction temperature and mass ratio of ILs to model oils were evaluated. An internal mechanism of the m-cresol extract by ILs was revealed by COSMO-RS calculation and FT-IR. The results showed that the selected ILs can extract m-cresol effectively from cumene and n-heptane, 1-ethyl-3-methylimidazolium acetate (emimCH3COO) was the best extraction solvent. A hydrogen bond between anion of ILs and phenolic hydroxyl groups was observed. M-cresol in model oils could be extracted with extraction efficiencies up to 98.85% at an emimCH3COO:model oils mass ratio of 0.5 and 298.15 K, emimCH3COO could be regenerated and reused for 4 cycles without obvious decreases in extraction efficiency and extractant mass.

关键词: Extraction, M-cresol, Ionic liquids, Separation, COSMO-RS, Hydrogen bond

Abstract: Low temperature coal tar contained a large amount of phenols, aromatic hydrocarbons and alkanes; the separation of phenols from coal tar has a great significance to the deep processing of coal tar. In this work, the separation of m-cresol from cumene and n-heptane by liquid-liquid extraction using ionic liquids (ILs) as extractants was studied. The suitable ILs were screened by conductor-like screening model for real solvents (COSMO-RS) model and the liquid-liquid phase equilibrium (LLE) experiments were to verify the accuracy of the screening results. The extraction conditions such as extraction time, extraction temperature and mass ratio of ILs to model oils were evaluated. An internal mechanism of the m-cresol extract by ILs was revealed by COSMO-RS calculation and FT-IR. The results showed that the selected ILs can extract m-cresol effectively from cumene and n-heptane, 1-ethyl-3-methylimidazolium acetate (emimCH3COO) was the best extraction solvent. A hydrogen bond between anion of ILs and phenolic hydroxyl groups was observed. M-cresol in model oils could be extracted with extraction efficiencies up to 98.85% at an emimCH3COO:model oils mass ratio of 0.5 and 298.15 K, emimCH3COO could be regenerated and reused for 4 cycles without obvious decreases in extraction efficiency and extractant mass.

Key words: Extraction, M-cresol, Ionic liquids, Separation, COSMO-RS, Hydrogen bond