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What is wood tar? Do you know?

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What is wood tar? Do you know?

Date of release:2018-04-26 Author: Click:

What is wood tar? Do you know?


Wood tar is an organic compound with high hydrocarbons, acids and phenols. After processing, creosote, anti-polymer, flotation foaming agent, wood asphalt and other products can be obtained. It can also be used in medicine, synthetic rubber and metallurgy.




Wood tar: A product (distilled tar) produced by carbonization of wood (coniferous or other wood) in a charcoal kiln (e.g., Swedish tar or pine tar) or by distillation in a distillation steamer or distillation furnace. Distilled tar can be directly precipitated from coke water (precipitated tar), or can be obtained from distilled coke water (partially dissolved tar).


All these tars are complex mixtures of hydrocarbons, phenols and their homologues, aldehydes, acetic acids and other products.




Tar made from greased wood is different from tar made from non-greased wood containing resin distillation products (terpenes, rosin oil, etc.). It is a viscous product with different colours from brown to dark brown. The products obtained by simple dehydration or partial distillation are mainly used for impregnating marine cables, plasticizers for rubber industry, sealants and medicines.




Tar from non-greased wood is a brown-black thick liquid, which can be distilled or treated by other methods to produce various by-products (wood heteroacid oil, guaiacol, etc.).




(2) Refined wood tar is obtained by distilling wood tar. Light oils (containing aliphatic hydrocarbons, terpenes and higher ketones) are used to make sheep bath water and horticultural sprays, while heavy oils (containing aliphatic hydrocarbons and aromatic hydrocarbons, higher ketones and higher phenols) are used to impregnate wood and extract xylenol oil.


The de-creosote oil obtained after the extraction of creosote oil can be used for flotation to concentrate minerals, pesticides, solvents and fuels, etc.




(3) Wood creosote is the main component of wood tar. Tar from non-greased wood is usually distilled, treated with sodium hydroxide, re-acidified and re-distilled to separate it from other components. Xylcreosote oil is a colorless liquid, but it shows color under the action of air and light. It has smoke and corrosiveness. It is mainly used as disinfectant and preservative. But do not confuse with creosote oil or mineral creosote oil. Creosote oil or mineral creosote oil are all classified as Tax No. 27.07.




2. Crude lignin is obtained by treating coke wood water. It is a light yellow liquid with a burnt odor. It usually contains 70-90% methanol and different proportions of acetone and other ketones (usually 8-20%). It also contains other impurities (methyl acetate, higher alcohols, tar-like substances, etc.). Some crude lignans are used as ethanol denaturants.



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