A simple and feasible separation process of toluene from n-heptane with imidazolium-based switchable solvents

Ren, Zhongqi; Yu, Hui; Wu, Xiaojia; Liu, Weidong; Zhang, Fan; Tian, Shichao; Zhou, Zhiyong

doi:10.1016/j.fuel.2022.123764

Cited by 7 publications

(2 citation statements)

References 45 publications

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“…The IL selection criteria for separating aromatics from aliphatic hydrocarbon mixtures include the distribution coefficients of aromatics and selectivity toward aromatics/aliphatics. Toluene/ n -heptane is a typical representative system for which liquid–liquid extraction methods are commonly used to separate toluene from heptane. ,− Arce et al used [EMIM][Tf 2 N] as an extraction solvent to separate toluene in a toluene/ n -heptane system at 298.15 K, and the IL’s performance as a solvent was evaluated by calculating the solute distribution ratio and selectivity. No IL was observed in the upper equilibrium phase of any contact line with heptane and toluene in the system, but a small amount of IL was detected in the upper phase of some equilibrium mixtures of octane and ethylbenzene in the system.…”

Section: Aromatics Extraction With Ilsmentioning

confidence: 99%

Hydrocarbon Extraction with Ionic Liquids

Yu,

Dai,

Liu

et al. 2024

Chem. Rev.

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Separation and reaction processes are key components employed in the modern chemical industry, and the former accounts for the majority of the energy consumption therein. In particular, hydrocarbon separation and purification processes, such as aromatics extraction, desulfurization, and denitrification, are challenging in petroleum refinement, an industrial cornerstone that provides raw materials for products used in human activities. The major technical shortcomings in solvent extraction are volatile solvent loss, product entrainment leading to secondary pollution, low separation efficiency, and high regeneration energy consumption due to the use of traditional organic solvents with high boiling points as extraction agents. Ionic liquids (ILs), a class of designable functional solvents or materials, have been widely used in chemical separation processes to replace conventional organic solvents after nearly 30 years of rapid development. Herein, we provide a systematic and comprehensive review of the state-of-the-art progress in ILs in the field of extractive hydrocarbon separation (i.e., aromatics extraction, desulfurization, and denitrification) including (i) molecular thermodynamic models of IL systems that enable rapid large-scale screening of IL candidates and phase equilibrium prediction of extraction processes; (ii) structure–property relationships between anionic and cationic structures of ILs and their separation performance (i.e., selectivity and distribution coefficients); (iii) IL-related extractive separation mechanisms (e.g., the magnitude, strength, and sites of intermolecular interactions depending on the separation system and IL structure); and (iv) process simulation and design of IL-related extraction at the industrial scale based on validated thermodynamic models. In short, this Review provides an easy-to-read exhaustive reference on IL-related extractive separation of hydrocarbon mixtures from the multiscale perspective of molecules, thermodynamics, and processes. It also extends to progress in IL analogs, deep eutectic solvents (DESs) in this research area, and discusses the current challenges faced by ILs in related separation fields as well as future directions and opportunities.

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Section: Aromatics Extraction With Ilsmentioning

confidence: 99%

Hydrocarbon Extraction with Ionic Liquids

Yu,

Dai,

Liu

et al. 2024

Chem. Rev.

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“…SSs are considered to be green solvents of the future due to their widespread application, from commercial to industrial, as shown in Table 4. 123,125,128,[175][176][177][178][179] When micro-extracting from environmental samples, researchers should investigate the potential use of additional environmentally friendly solvents such as liquid polymers and bio-solvents. Switchable solvent pollution of the environment can be reduced by pre-concentration processes that effectively recover and recycle these solvents.…”

Section: Challenges and Future Prospects For Sssmentioning

confidence: 99%