C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
196/22
C10G 1/04 (2006.01)
Patent
CA 1267860
"INCLINED PLATE SETTLING OF DILUTED BITUMEN FROTH" ABSTRACT OF THE DISCLOSURE 'Diluted bituminous froth' is a product from the hot water extraction process for recovering bitumen from tar sand. This diluted froth is a mixture comprising bitumen, water, light hydrocarbon diluent, and particulate solids. In accordance with the invention, the diluted froth is treated in an inclined plate settler, before it enters the centrifuge circuit conventionally used to separate the components of the froth. The settler is controlled by varying its underflow withdrawal rate in response to the hydrocarbon content of the overflow from the settler, to maintain said overflow hydrocarbon content at a level which is sufficiently pure so as to be acceptable, after diluent removal, as feed to the downstream upgrading process. The underflow from the settler is passed to the centrifuge circuit to recover hydrocarbon therefrom. The composition of the underflow has been found to be less variable than the composition of the diluted froth feed, thereby making it easier to operate the centrifuge circuit.
538412
Alberta Energy Company Ltd.
Bennett Jones Llp
Canadian Occidental Petroleum Ltd.
Esso Resources Canada Limited
Gulf Canada Limited
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