C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
196/19
C10G 1/04 (2006.01)
Patent
CA 1188644
"CONTROL OF PROCESS AID USED IN HOT WATER PROCESS FOR EXTRACTION OF BITUMEN FROM TAR SAND" ABSTRACT OF THE DISCLOSURE 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 froth 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 sub- stantially at the level which leads to maximum primary bitumen froth recovery.
423480
Schramm Laurier L.
Smith Russell G.
Alberta Energy Company Ltd.
Canada-Cities Service Ltd.
Esso Resources Canada Limited
Gulf Canada Limited
Her Majesty The Queen In Right Of The Province Af Alberta As Represente D. By The Minister Of Energy And Natural Resources
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