Polar solvent dedusting
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United States of America Patent
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-
Jun 2, 1987
Issued Date -
N/A
app pub date -
Jun 28, 1985
filing date -
Oct 12, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process and system is provided to produce and dedust oil from oil shale and other types of solid hydrocarbon-containing material. In the process, raw oil shale is retorted, preferably with solid heat carrier material, to liberate an effluent product stream of hydrocarbons containing entrained particulates of dust derived from the oil shale or other solid hydrocarbon-containing material. A fraction of oil containing most of the dust is separated from the effluent product stream and fed to one or more dedusters. The dust-laden oil is dissolved in a special mixture of dedusting solvents which contains both polar and non-polar dedusting solvents. In the deduster, the dissolved oil is separated into a dedusted stream of oil and solvents and a residual stream of dust-laden sludge. Solvents are recovered from the dedusted stream as well as the sludge. The recovered solvents are recycled to the deduster for use in dedusting the oil. The sludge is preferably dried and combusted for use as part of the solid heat carrier material in the retort.
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