Process for production of value-added coproducts from coal and other carbonaceous materials
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United States of America Patent
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Aug 3, 1993
Grant Date -
N/A
app pub date -
May 22, 1989
filing date -
May 22, 1989
priority date (Note) -
Expired
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Abstract
Coal is heated between about 95.degree. and 250.degree. C. to evaporate moisture, but not volatile hydrocarbons. The dried coal is heated to a temperature between about 400.degree. and 700.degree. C. to recover volatile hydrocarbons and to form char, the char is treated with hydrogen at a temperature between about 700.degree. and 1000.degree. C. to form methane, and the methane is decomposed to form pure carbon and hydrogen, which is recycled to treat the char.
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