
The Bergius process is a method of production of liquid hydrocarbons for use as synthetic fuel by hydrogenation of high-volatile bituminous coal at high temperature and pressure. It was first developed by Friedrich Bergius in 1913, in 1931 Bergius was awarded the Nobel Prize in Chemistry for his development of high pressure chemistry. ==Process== ...
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http://en.wikipedia.org/wiki/Bergius_process

(from the article `coal utilization`) The first commercially available liquefaction process was the Bergius process, developed in Germany during World War I. This involves dissolving coal ...
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http://www.britannica.com/eb/a-z/b/51

a method of hydrogenation formerly used with coal to produce an oil similar to petroleum.
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https://www.infoplease.com/dictionary/bergius-process
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