Coal tar refining by aromatic-aliphatic solvent extraction for preparing QI-free pitch Online publication date: Fri, 13-Mar-2020
by Yonggang Wang; Jianhong Hu; Dan Liu; Zhe Liu; Haiyong Zhang; Shu Zhang
International Journal of Oil, Gas and Coal Technology (IJOGCT), Vol. 23, No. 3, 2020
Abstract: To obtain suitable material for making needle coke, the aromatic and aliphatic solvents were blended for extracting desirable compositions from coal tar and simultaneously removing heavy components, particularly quinoline insoluble (QI). The results show that the low QI content (0.06 Wt%) in refined coal tar was acquired when the aromatic portion in the mixed solvent was ~30 Wt%, while the yield of refined tar increased with increasing aromatic solvent. Under the given ratio of aromatic to aliphatic (2:3 by mass), the QI contents and refined tar yields both reduced as the ratio of mixed solvent to coal tar increased. The fractions (HS, HI-TS, TI-QS) in refined tar were largely affected by the nature of solvent and solvent-tar solution. The distribution of molecular sizes in refined tars were determined by the solubility of tarry compositions in mixed solvent and the precipitating process due to the agglomeration of QI-like materials in solvent. [Received: March 3, 2018; Accepted: April 9, 2018]
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Oil, Gas and Coal Technology (IJOGCT):
Login with your Inderscience username and password:
Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.
If you still need assistance, please email subs@inderscience.com
Our Blog 
Follow us on Twitter 
Visit us on Facebook