The coal-to-oil technology originated in World War II Germany, when German chemists sought to use this technology to replace oil with coal, thus addressing Germany's shortage of oil.
The core of this technology is using coal as a raw material to produce oil products and petrochemical products through chemical processing, including two technological routes: direct coal liquefaction and indirect coal liquefaction.
Direct coal liquefaction technology involves liquefying raw coal directly into liquid hydrocarbon fuels under high temperature and high pressure with catalytic hydrogenation, removing atoms such as sulfur, nitrogen, and oxygen.
This technology has high requirements for the quality of raw coal, with early technology requiring a reaction temperature of 470℃ and a reaction pressure of 70MPa.
