Cleaning and liquid contact with solids – Processes – Including regeneration – purification – recovery or separation...
Patent
1994-02-17
1995-10-03
Dawson, Robert A.
Cleaning and liquid contact with solids
Processes
Including regeneration, purification, recovery or separation...
134 251, 203 39, 203 47, 203DIG16, 405128, 210710, 210712, 210737, 210774, 210781, 210787, 210806, B08B 704, C23G 136
Patent
active
054548780
ABSTRACT:
A system for removing hydrocarbons from solid materials. Contaminated solids are combined with a solvent (preferably terpene based) to produce a mixture. The mixture is washed with water to generate a purified solid product (which is removed from the system) and a drainage product. The drainage product is separated into a first fraction (consisting mostly of contaminated solvent) and a second fraction (containing solids and water). The first fraction is separated into a third fraction (consisting mostly of contaminated solvent) and a fourth fraction (containing residual solids and water). The fourth fraction is combined with the second fraction to produce a sludge which is separated into a fifth fraction (containing water which is ultimately reused) and a sixth fraction (containing solids). The third fraction is then separated into a seventh fraction (consisting of recovered solvent which is ultimately reused) and an eighth fraction (containing hydrocarbon waste).
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Bala Gregory A.
Thomas Charles P.
Dawson Robert A.
Lockheed Idaho Technologies Company
Popovics Robert James
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