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Coal chemical industry coal, chemical processing of coal as raw material, the process of converting coal into gas, liquid and solid fuels and chemicals through chemical processing. It mainly includes coal gasification, liquefaction, carbonization, tar processing and calcium carbide acetylene chemical industry. Coal chemical industry began in the second half of the 18th century, and a complete coal chemical industry system was formed in the 19th century. In the 20th century, many organic chemicals using agricultural and forestry products as raw materials were mostly produced using coal as raw materials, and coal chemical industry became an important part of the chemical industry. After the Second World War, the petrochemical industry developed rapidly, and the production of many chemicals shifted from using coal as raw materials to using oil and natural gas as raw materials, thus weakening the position of coal chemical industry in the chemical industry. The chemical structure of organic matter in coal is a macromolecular structure with mainly aromatic fused rings as the unit core, interconnected by bridge bonds, and with various functional groups. Through thermal processing and catalytic processing, coal can be converted into various fuels and chemical products. Coking is the earliest applied method and is still the most important. Its main purpose is to produce coke for metallurgy, and at the same time, by-products include gas and aromatic hydrocarbons such as benzene, toluene, xylene, and naphthalene. Coal gasification also plays an important role in the coal chemical industry. It is used to produce city gas and various fuel gases, and is also used to produce syngas. ； Processes such as low-temperature carbonization of coal, direct coal liquefaction and indirect coal liquefaction mainly produce liquid fuels. This post was last edited by Lang Taosha on 2008-3-26 15:22 ]