Purpose:

Phenolic compounds in medium and low temperature coal tar are mainly low-grade phenols, which can be extracted by chemical extraction as chemical raw materials. The distillate after extracting low-grade phenols will be an excellent raw material for hydrogenation to produce high cetane diesel.

Medium and low temperature coal tar can be hydrotreated to produce diesel, gasoline and other automotive engine fuel oils and chemicals.

Formation recovery:

The volatile matter released from the charged coal when it is heated in the air insulated carbonization chamber enters the furnace top space through the gap between the coke cake and the wall of the carbonization chamber, the gap between the hot coke and semi coke itself, and the gap between the coal materials. The secondary thermal decomposition reaction (alkane cracking and aromatization reaction, naphthenic hydrocarbon dehydrogenation reaction, phenol dehydration and condensation reaction, aromatic hydrocarbon and heterocyclic compound dealkylation reaction, etc.) occurs at a high temperature of 700~850 ℃. These gaseous coal carbonization products at about 700 ℃ carry coal dust, coke dust and pyrolytic carbon, enter the gas header through the riser, and are quenched to 70~80 ℃ by circulating ammonia water. In the gas collector, most of the coal dust, coke dust, pyrolytic carbon and some high boiling coal tar are condensed and washed down. The remaining coal tar in the form of fog or steam is gradually condensed and separated in the coke oven gas primary cooler and the gas purification equipment behind it. The condensed and separated coal tar is collected into the tar ammonia separator to preliminarily remove ammonia water and tar residue and separate the coal tar. When coal is carbonized at high temperature, the yield of coal tar is generally 3~4.5% of the quality of dry coal.