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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

Postal Subscription Code 80-969

2018 Impact Factor: 2.809

Front. Chem. Sci. Eng.    2024, Vol. 18 Issue (10) : 111    https://doi.org/10.1007/s11705-024-2462-9
Deciphering the intermolecular interactions for separating bicyclic and tricyclic aromatics via different naphthalene-based solvents
Pengzhi Bei1, Antony Rajendran2, Jie Feng1, Wen-Ying Li1()
1. State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, China
2. Department of Chemistry, Mepco Schlenk Engineering College, Sivakasi 626005, India
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Abstract

The traditional separation of bicyclic and tricyclic aromatics from coal tar involves complicated multi-steps and consumes significantly more energy. Previous work accomplished the separation between anthracene-phenanthrene isomers using electrostatic interaction, but for the separation between bicyclic and tricyclic aromatics, electrostatic interactions are difficult to produce a recognizable effect. Naphthalene-based solvents, named as naphthaleneacetamide, naphthaleneethanol, naphthalenemethanol, naphthol, naphthylacetic acid, naphthylacetonitrile, and naphthylamine, respectively, were used for the efficient separation of naphthalene and phenanthrene via dispersion interaction. Results showed that the pre-studied structural parameters are the key factors in selecting an efficient solvent. And the substituents on the intermolecular interactions involved in the separation processes had an important impact, which were evaluated. Naphthalenemethanol exhibited a superior performance with a purity of 96.3 wt % naphthalene products because its electron-donating substituent enables the selective recognition of naphthalene via the dispersion interaction. The used naphthalene-based solvents can be regenerated and recycled via back extraction with a purity of over 90 wt % naphthalene products, suggesting solvent structural stability during the regeneration processes. Notably, the naphthalene-based solvents also demonstrated better separation performance for polycyclic aromatics from coal tar with a purity of over 80 wt % for bicyclic aromatics. This study would enhance the utilization of coal tar as a valuable source of polycyclic aromatics besides broadening the knowledge for applying non-bonded interaction in the separation of polycyclic aromatics technologies.

Keywords separation mechanism      dispersion interaction      coal tar      polycyclic aromatic hydrocarbons     
Corresponding Author(s): Wen-Ying Li   
Just Accepted Date: 29 April 2024   Issue Date: 17 June 2024
 Cite this article:   
Pengzhi Bei,Antony Rajendran,Jie Feng, et al. Deciphering the intermolecular interactions for separating bicyclic and tricyclic aromatics via different naphthalene-based solvents[J]. Front. Chem. Sci. Eng., 2024, 18(10): 111.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-024-2462-9
https://academic.hep.com.cn/fcse/EN/Y2024/V18/I10/111
Fig.1  LOL-π maps for (a) naphthalene, (b) phenanthrene, (c) anthracene, and (d) fluorene. Reprinted with permission from Ref. [35]. Copyright 2022, Elsevier.
Fig.2  Separation effect of different naphthalene-based solvents. K: partition coefficient.
Operation conditionPartition coefficient Naphthalene/wt %
NaphthalenePhenanthrenePurityYield
xa)naphthalenemethanol /mol %
21.700.25 50.125.1
57.800.2670.040.2
1010.660.1896.370.0
127.800.6084.060.0
Mass ratio of solventb) to oil
1:14.830.1487.154.2
2:16.870.1992.158.4
3:110.660.1896.370.0
4:112.860.2695.065.3
5:118.030.5096.060.2
Temperature/°C
253.010.1085.155.2
305.030.1192.060.3
3510.660.1896.370.0
4011.110.3695.065.1
4512.790.5596.059.0
Tab.1  Separation performances of synthesized solvent
Fig.3  The dispersion interaction energy between naphthalenemethanol and naphthalene/phenanthrene.
Fig.4  GC × GC-MS analysis results. (a) Coal tar, (b) bicyclic aromatic hydrocarbons, and (c) tricyclic aromatic hydrocarbons.
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