Coal tar is a complex mixture of highly aromatic hydrocarbons, most of which are polycyclic and fused ring compounds with or without side chains and heterocyclic compounds containing oxygen, sulfur and nitrogen, and contain a small amount of fatty hydrocarbons, cycloalkanes and unsaturated hydrocarbons, as well as coal dust, coke dust and pyrolytic carbon. The newly recovered coal tar also contains about 5% chemicalbook water dissolved with a variety of inorganic salts and other impurities. Due to the existence of pyrolytic carbon with very fine particles, water often forms a stable emulsion with oil. Most components of coal tar have high melting points, but due to the mutual dissolution of a large number of monomer compounds to form a low CO soluble mixture, coal tar is still in a liquid state at room temperature.
Properties
Summary
Coal tar is a complex mixture of highly aromatic hydrocarbons, most of which are polycyclic and fused ring compounds with or without side chains and heterocyclic compounds containing oxygen, sulfur and nitrogen, and contain a small amount of fatty hydrocarbons, cycloalkanes and unsaturated hydrocarbons, as well as coal dust, coke dust and pyrolytic carbon. The newly recovered coal tar also contains about 5% water dissolved with a variety of inorganic salts and other impurities. Due to the existence of pyrolytic carbon with very fine particles, water often forms a stable emulsion with oil. Most components of coal tar have high melting points, but due to the mutual dissolution of a large number of monomer compounds to form a low CO soluble mixture, coal tar is still in a liquid state at room temperature.