A residue produced by distillation or heat treatment of coal tar. It is a solid at
room temperature, consists of a complex mixture of numerous predominantly aromatic
and heterocyclics, and exhibits a broad softening range instead of a defined melting
The hydrogen aromaticity
in coal tar pitch
(ratio of aromatic to total content of hydrogen atoms) varies from 0.7 to 0.9.
PAC, 1995, 67, 473
(Recommended terminology for the description of carbon as a solid (IUPAC Recommendations
on page 485
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook