Extraction of bitumen from bitumen froth and biotreatment of bit

Details Extraction of bitumen from bitumen froth and biotreatment of bit Extraction of bitumen from bitumen froth and biotreatment of bit

1998-11-16

1999-10-19

Yildirim, Bekir L.

Mineral oils: processes and products

Tar sand treatment with liquid

208 45, 435281, C10G 104, C10G 3200

Patent

active

059683490

ABSTRACT:
A process for the extraction of bitumen from bitumen froth generated from tar sands is disclosed. In this process, bitumen froth is extracted from tar sands using a water process without requiring the use of caustic soda. The froth is treated in a counter-current decantation circuit with a paraffinic solvent to remove precipitated asphaltenes, water, and solids from the bitumen froth. A dilute bitumen product is produced having final water and solids contents of about 0.01 to about 1% by weight. This renders the dilute bitumen product amenable to direct hydrocracking. The process provides an alternative route to the conventional process of utilizing centrifuges to separate bitumen from precipitated asphaltenes, water, and solids and thus avoids the high capital and operating costs associated with the conventional bitumen froth treatment by centrifugation. The invention utilizes bitumen froth produced from a water process in which the use of caustic soda is not required. The process advantageously avoids the production of tailings sludges caused by clay dispersions. The present invention also teaches a novel process for the biotreatment of bitumen froth tailings resulting in a reduced amount of waste products and waste byproducts.

REFERENCES:
patent: 3997398 (1976-12-01), Zajic et al.
patent: 4349633 (1982-09-01), Worne et al.
patent: 4640767 (1987-02-01), Zajic et al.
patent: 4648964 (1987-03-01), Leto et al.

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