IUPAC definition : 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
hydrocarbons and heterocyclics, and exhibits a broad softening range instead of a
defined melting temperature.;
Scope note : the hydrogen aromaticity in coal tar pitch (ratio of aromatic to total content of
hydrogen atoms) varies from 0.7 to 0.9.;
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
hydrocarbons and heterocyclics, and exhibits a broad softening range instead of a
defined melting temperature.