Mineral oils: apparatus – Solvent extraction
Patent
1982-09-30
1983-12-27
Garris, Bradley
Mineral oils: apparatus
Solvent extraction
196100, 196134, 422268, B01D 1102, C10C 308
Patent
active
044229011
ABSTRACT:
In a continuous process for the extraction of crude refinery stock from oil-bearing sand, miscella produced earlier in the process is returned and mixed with oil-bearing sand to provide a feed slurry which, after heating, is separated into two streams, one of which is comprised predominantly of the coarser sand particles in the feed sand and miscella and the other of which contains most of the fine sand particles in the feed slurry. Miscella extracted by hot solvent from one of these streams is recycled to produce at least part of the miscella returned to produce the feed mix, and the other stream is processed to remove at least most of the sand and yield a miscella which is then distilled to separate the solvent for recycle to the extraction stages. Generally stated, a decantation step involving countercurrent extraction of the feed slurry will be used with sands which are comprised largely of fine particles. Percolation and separation of miscella along with solvent extract of bitumen from the sand is used where the sand in the feed mix is predominantly coarse. The spent sand from both streams is combined, and being still wet with solvent, is subjected to steam stripping, yielding solvent vapor. The hot vapors which result are first used to preheat the feed slurry followed by condensation and separation of solvent, which is recycled into the system, and water. Heat is also recuperated from the spent sand to preheat the feed slurry.
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Dravo Corporation
Garris Bradley
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