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Separation of arenols from a low-temperature coal tar by liquid-liquid extraction

  • Separation Technology, Thermodynamics
  • Published:
Korean Journal of Chemical Engineering Aims and scope Submit manuscript

Abstract

Low-temperature coal tar (LTCT) is a sticky liquid mixture produced mainly from coal pyrolysis, which contains various value-added chemicals (VACs). Liquid-liquid extraction is considered as one of the green and effective ways to explore the organic composition and separate the VACs from LTCT. Herein, petroleum ether, methanol, and carbon disulfide were used to extract arenols from a LTCT. As a result, the relative content and absolute content of arenols extracted from the LTCT are ca. 96.3% and 85.9%, respectively. Among them, p-cresol is predominant, accounting for 22.2%. The isolated contents of arenols are up to 84.6%. Moreover, a kilogram-scale operation was carried out under the same conditions, which offers a potential application in industrial production.

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Abbreviations

AC:

absolute content

ACCAs :

the absolute content of arenols in the crude arenols

ACLT MT :

the absolute content of arenols in the low-temperature coal tar

ARs:

aromatic rings

BE:

back extraction

CAs:

crude arenols

CDS:

carbon disulfide

FTIR:

Fourier transform infrared spectrometer

GC/MS:

gas chromatograph/mass spectrometer

HCs:

hydrocarbons

IP:

incorporated portion

LLE:

liquid-liquid extraction

LP:

lower phase

LTCT:

low-temperature coal tar

m CAs :

the mass of crude arenols

M/CDSMS:

methanol/carbon disulfide mixed solvent

m LTCT :

the mass of low-temperature coal tar

PE:

petroleum ether

PE/MMS:

petroleum ether/methanol mixed solvent

RC:

relative content

SGC:

specific group components

SF:

separating funnel

TR:

total recovery

TRC:

total relative content

UP:

upper phase

VACs:

value-added chemicals

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Acknowledgements

This work was supported by the Natural Scientific Foundation of China (Grant 21576280), the National Key Research and Development Program of China (Grant 2018YFB0604602), and a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.

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Correspondence to Zhi-Min Zong.

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Gao, HS., Zong, ZM., Yang, Z. et al. Separation of arenols from a low-temperature coal tar by liquid-liquid extraction. Korean J. Chem. Eng. 37, 835–838 (2020). https://doi.org/10.1007/s11814-020-0480-y

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  • DOI: https://doi.org/10.1007/s11814-020-0480-y

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