Low-sulfur fuels from coals

Carl W Kruse (Inventor), Jimmie D. Cooper (Inventor), Neil L. Shimp (Inventor), Roy J. Helfinstine (Inventor)

Research output: Patent


Fine particles of solid fossil fuels are pyrolyzed by passage in a thin layer through a heating zone at successively higher temperatures in a non-oxidizing atmosphere while rapidly separating and removing volatile pyrolysis products. The resulting char may be first treated with mineral acid or employed directly in the hydroprocessing of additional solid fossil fuel to liquid fuels. Alternatively, the acid-washed char may be hydrotreated to afford an improved char product having a low sulfur and mineral content.
Original languageEnglish (US)
U.S. patent number4758331
Filing date2/27/84
StatePublished - Jul 19 1988


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