Mineral oils: processes and products – Products and compositions – Lubricating oils
Patent
1983-03-17
1984-07-31
Gantz, Delbert E.
Mineral oils: processes and products
Products and compositions
Lubricating oils
C10G 104
Patent
active
044628927
ABSTRACT:
The hot water process is sensitive to the nature of the tar sand feed, which varies. An alkaline process aid, usually NaOH, is normally added to the conditioning step of the process and is needed to obtain good bitumen recovery from most tar sand feeds. The invention is based on the discovery that, for a particular extraction circuit used, there is a single value of free surfactant content in the aqueous phase of the process slurry which will yield maximum primary froth recovery regardless of the type of tar sand feed used. The process in accordance with the invention therefore comprises: (a) determining, for a single tar sand type and the extraction circuit used, the free surfactant content in the aqueous phase of the slurry, which will yield the maximum primary bitumen forth recovery; (b) monitoring the free surfactant content in the aqueous phase of the slurry during subsequent processing of various types of tar sand feed in said circuit; and (c) varying the process aid addition to the slurry as the nature of the tar sand feed varies, to maintain said free surfactant content substantially at the level which leads to maximum primary bitumen froth recovery.
REFERENCES:
patent: 4201656 (1980-05-01), Sanford
Schramm Laurier L.
Smith Russell G.
Alberta Energy Company Ltd.
Canada-Cities Service, Ltd.
Esso Resources Canada Limited
Gantz Delbert E.
Gulf Canada Limited
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