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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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