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<p>Separation of benzene, toluene, and xylene (BTX) from heavy naphtha is crucial for improving thermal efficiency and preventing fouling in petrochemical plants. This paper explores the potential of 1-butyl-3-methylimidazolium Tosylate ([Bmim][Tos]) as an environmentally friendly alternative to traditional solvents used to perform extractions. The influence of the solvent-to-feed ratio (0.5–1.5), the mixing speed (200–1000&#xa0;rpm), and the mixing time (1–3&#xa0;h) on the efficiency of BTX removal and the distribution coefficient (K) was studied at systematic levels using the Box-Behnken response surface methodology (RSM). [Bmim] showed better extraction, with maximum removing efficiencies (benzene 67.05%, toluene 55.66%, and xylene 42.72%) and a total BTX excluding rate (S/F = 1.5, 1000&#xa0;rpm, 2&#xa0;h) = 55.14%. The associated distribution coefficients were 2.03 (benzene), 1.26 (toluene), and 0.75 (xylene) with an average KBTX = 1.34. Regressions were highly accurate predictors, with R<sup>2</sup> values of 0.9926 (benzene), 0.9983 (toluene), 0.9890 (xylene), and 0.9962 (BTX) for efficiency of removal, and 0.9904 (benzene), 0.9977 (toluene), 0.9901 (xylene), and 0.9952 (BTX) for distribution coefficient. Through FTIR analysis, it was observed that aromatics were absorbed via π-π interactions, with stronger solvation of the Tosylate anion. The solvent-to-feed ratio was found to be the most critical parameter, with mixing speed and time exerting a comparative influence. [Bmim][Tos] has negligible vapor pressure, recyclability, and high selectivity that make it a technically and environmentally superior organic solvent compared to traditional solvents used in sustainable aromatic extraction processes in real-world applications, such as aromatic extraction processes in refineries.</p>

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Effective Separation of Aromatic Hydrocarbons in Real Heavy Naphtha with [Bmim][Tos] Ionic Liquid: Experimental and Statistical Study

  • 期刊论文

  • 发表日期：

    2026年1月19日

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  • Ahmed Mahdi Roomi,
  • Abdul Mun’em A. Karim,
  • Talib M. Albayati

摘要

Separation of benzene, toluene, and xylene (BTX) from heavy naphtha is crucial for improving thermal efficiency and preventing fouling in petrochemical plants. This paper explores the potential of 1-butyl-3-methylimidazolium Tosylate ([Bmim][Tos]) as an environmentally friendly alternative to traditional solvents used to perform extractions. The influence of the solvent-to-feed ratio (0.5–1.5), the mixing speed (200–1000 rpm), and the mixing time (1–3 h) on the efficiency of BTX removal and the distribution coefficient (K) was studied at systematic levels using the Box-Behnken response surface methodology (RSM). [Bmim] showed better extraction, with maximum removing efficiencies (benzene 67.05%, toluene 55.66%, and xylene 42.72%) and a total BTX excluding rate (S/F = 1.5, 1000 rpm, 2 h) = 55.14%. The associated distribution coefficients were 2.03 (benzene), 1.26 (toluene), and 0.75 (xylene) with an average KBTX = 1.34. Regressions were highly accurate predictors, with R2 values of 0.9926 (benzene), 0.9983 (toluene), 0.9890 (xylene), and 0.9962 (BTX) for efficiency of removal, and 0.9904 (benzene), 0.9977 (toluene), 0.9901 (xylene), and 0.9952 (BTX) for distribution coefficient. Through FTIR analysis, it was observed that aromatics were absorbed via π-π interactions, with stronger solvation of the Tosylate anion. The solvent-to-feed ratio was found to be the most critical parameter, with mixing speed and time exerting a comparative influence. [Bmim][Tos] has negligible vapor pressure, recyclability, and high selectivity that make it a technically and environmentally superior organic solvent compared to traditional solvents used in sustainable aromatic extraction processes in real-world applications, such as aromatic extraction processes in refineries.