History
The Karrick process was invented by Lewis Cass Karrick in the 1920s. Although Karrick did not invent coal LTC as such, he perfected the existing technologies resulting the Karrick process. The retort used for the Karrick process based on the Nevada–Texas–Utah Retort, used for the shale oil extraction.
In 1935, a Karrick LTC pilot plant was constructed in the coal research laboratory at the University of Utah. Commercial-size processing plants were operated during 1930s in Colorado, Utah and Ohio. During World War II, similar processing plant was operated by the United States Navy. In Australia, during World War II the Karrick process plants were used for shale oil extraction in New South Wales. In 1950s–1970s, the technology was used by the Rexco Company in its Snibston plant at Coalville in Leicestershire, England.
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