Separation of polycyclic aromatic hydrocarbons by solvent screening assisted extractive distillation from FCC diesel

Jun Li; Wanting Yu; Jinsen Gao

doi:10.1016/j.cjche.2025.09.001

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Separation of polycyclic aromatic hydrocarbons by solvent screening assisted extractive distillation from FCC diesel

Updated：2026-02-12

- Separation of polycyclic aromatic hydrocarbons by solvent screening assisted extractive distillation from FCC diesel
- Chinese Journal of Chemical Engineering Vol. 87, Issue 11, Pages: 89-102(2025)
- Affiliations：
  
  State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing),Beijing,China,102249
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2025.09.001
  CLC：
- Published：2025
- Accepted：
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Jun Li, Wanting Yu, Jinsen Gao. Separation of polycyclic aromatic hydrocarbons by solvent screening assisted extractive distillation from FCC diesel[J]. Chinese Journal of Chemical Engineering, 2025, 87(11): 89-102.
DOI：

Jun Li, Wanting Yu, Jinsen Gao. Separation of polycyclic aromatic hydrocarbons by solvent screening assisted extractive distillation from FCC diesel[J]. Chinese Journal of Chemical Engineering, 2025, 87(11): 89-102. DOI： 10.1016/j.cjche.2025.09.001.

摘要

Abstract

The oversupply of diesel in China necessitates efficient separation of polycyclic aromatic hydrocarbons from fluidized catalytic cracking diesel for value-added utilization. However

purification is hindered by alkane and monocyclic aromatic interference. In this work

we propose a solvent-screening strategy for extractive distillation based on molecular polarity and interaction energy analysis. Quantum chemical calculations identified ethylene glycol (aromatic solubility) and

-dimethylformamide (alkane selectivity) as optimal solvents

with weak hydrogen bonds (

e.g.

O-H…π

C-H…π) governing aromatic interactions. Two process designs were developed: (1) solvent extraction followed by primary extractive distillation (purity 95.0% (mass)) and (2) direct two-stage extractive distillation (purity 92.0% (mass)). This work provides a flexible framework for polycyclic aromatic hydrocarbon separation tailored to market demands while elucidating solvent-solute interactions at the molecular level.

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