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Coal liquefaction is a chemical process that converts solid coal into liquid hydrocarbons, including synthetic fuels and petrochemicals. Often referred to as "coal-to-liquids" (CTL) or more broadly "carbon-to-X", coal liquefaction offers an alternative to conventional petroleum-derived fuels. The process can be classified into two main approaches: direct liquefaction (DCL), which chemically transforms coal into liquid products using high pressure and hydrogen, and indirect liquefaction (ICL), which first gasifies coal into synthesis gas that is subsequently converted into liquid fuels, often through the Fischer–Tropsch synthesis.
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