(from the article `petroleum refining`) Since World War II the demand for light products (e.g., gasoline, jet, and diesel fuels) has grown, while the requirement for heavy industrial fuel ...
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the process of heating coal, usually lignite, in an oven to burn off unwanted impurities. The unwanted impurities and waste gas escape from a chimney or a stack and the coal is then used as an industrial fuel.
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