Mineral oils: processes and products – Tar sand treatment with liquid – Inorganic liquid
Reexamination Certificate
2008-04-15
2008-04-15
Caldarola, Glenn (Department: 1797)
Mineral oils: processes and products
Tar sand treatment with liquid
Inorganic liquid
C208S390000, C208S435000
Reexamination Certificate
active
10999024
ABSTRACT:
Bitumen extraction done using a process comprising: (a) preparing a bitumen froth comprising particulate mineral solids and hydrocarbons dispersed in aqueous lamella in the form of an emulsion; (b) adding a sufficient amount of a paraffinic solvent to the froth to induce inversion of the emulsion and precipitate asphaltenes from the resultant hydrocarbon phase; (c) mixing the froth and the solvent for a sufficient time to dissolve the solvent into the hydrocarbon phase to precipitate asphaltenes; and (d) subjecting the mixture to gravity or centrifugal separation for a sufficient period to separate substantially all of the water and solids and a substantial portion of the asphaltenes from the bitumen; wherein a separation enhancing additive is present in the process. The separation enhancing additive is a polymeric surfactant that has multiple lipophilic and hydrophilic moieties, which can effect easier handling of asphaltene sludges and less foaming during solvent recovery.
REFERENCES:
patent: 2598234 (1952-05-01), Keiser et al.
patent: 3929625 (1975-12-01), Lucas
patent: 4416754 (1983-11-01), Merchant et al.
patent: 4640767 (1987-02-01), Zajic et al.
patent: 5282984 (1994-02-01), Ashrawi
patent: 6214213 (2001-04-01), Tipman et al.
Hart Paul R.
Maharajh Edward M.
Baker Hughes Incorporated
Caldarola Glenn
Douglas John
Madan Mossman & Sriram P.C.
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