Coal liquefaction is the process of producing liquid fuels from coal. Coal liquifaction is a means of addressing the many energy applications that are suited for consuming liquids. The technology entails heating coal, often with various reagents such as hydrogen, which produces a liquid. The technologies can be controversial since they often generate large volumes of waste. The economic attractiveness of coal liquifaction is coupled to the price of petroleum. Related, competing technologies include coal gasification.
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“... gathering news in Russia was like mining coal with a hatpin.”
—Mary Heaton Vorse (1874–1966)