Two-stage tar sands extraction process
A method is described for extracting bitumen from tar sands, wherein the tar sands contain at least 3 weight percent connate water, comprising initially contacting the bitumen with a specific solvent in a first extraction stage and thereafter contacting the bitumen with both a nonspecific solvent and a specific solvent in a second extraction stage, whereby a bitumen product low asphaltenes and fines is obtained. A method is also described for extracting bitumen tar sands, wherein the tar sands contain less than 3 weight percent connate water, comprising: (a) initially slurrying the tar sand with a nonspecific solvent to dissolve a substantial portion of the available bitumen in a first extraction stage; (b) separating the bitumen-containing solvent from the slurry solids; (c) contacting the bitumen-containing solvent with a specific solvent to precipitate asphaltenes and fines in a second extraction stage; (d) separating the fines and the asphaltenes from the bitumen-containing solvents; and (e) recovering the bitumen from the solvents.
- Assignee:
- Standard Oil Co., Chicago, IL
- Patent Number(s):
- US 4596651
- OSTI ID:
- 5602277
- Country of Publication:
- United States
- Language:
- English
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Tar sands extraction process
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Related Subjects
040402* -- Oil Shales & Tar Sands-- Surface Methods
ASPHALTENES
ASPHALTS
BITUMENS
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
CONNATE WATER
DISPERSIONS
DISSOLUTION
ENERGY SOURCES
EXTRACTION
FOSSIL FUELS
FUELS
GROUND WATER
HYDROGEN COMPOUNDS
INTERSTITIAL WATER
MATERIALS
MIXTURES
OIL SANDS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PRECIPITATION
QUANTITY RATIO
SEPARATION PROCESSES
SLURRIES
SOLVENT EXTRACTION
SOLVENTS
SUSPENSIONS
TAR
WATER