4、 The destructive distillation of bituminous coal, done in the absence of air in order to obtain coke and other fractions having a greater percentage of carbon than the original material.
1、Made by the destructive distillation of wood.
3、"After destructive distillation, coal leaves a solid residue, coke, while, coal-tar and pitch are collected as a distillate, and coal-gas is collected in gasometer"
2、Peat tar has similar properties to the tar derived from the destructive distillation of wood.
