In addition to wood vinegar, the carbonization process produces another important liquid, wood tar.
Characteristic of wood tar: black-brown viscous liquid, with a specific gravity of 1.035-1.054, contains a large amount of phenol, and is obtained by fractional distillation.
Wood tar is a kind of organic compound containing hydrocarbons, acids, and phenols that can be used in the filed of medicine, synthetic rubber and metallurgical departments. After processing, we can get creosote oil, anti-agglomerants, floatation frother, wood asphalt and other products.
The main component of wood tar is wood creosote, which is usually distilled from non-fatted wood, treated with sodium hydroxide, acidified and redistilled to separate it from other components. Wood creosote is one colorless liquid, but in the air its light show visible color, smoke smell, corrosive, which mainly used as disinfectants and preservatives.
With different degrees, we can get different final products from wood tar:
Light oil (neutral oil) Below 190 degree
Creosote oil (cresol) 190-240 degree
Antioxidants (anti-agglomerants) 240-300 degree
Heavy oil (asphalt) 300 degree
