coking

(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 ...
Found on http://www.britannica.com/eb/a-z/c/107

Coking

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.
Found on http://www.chemistry-dictionary.com/definition/coking.php
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