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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0192892 (1998-11-16) |
발명자 / 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 | 피인용 횟수 : 420 인용 특허 : 4 |
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 paraffini
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.
[ We claim:] [1.] A process for the extraction and recovery of bitumen from bitumen froth generated from tar sands and thereby produce a dilute bitumen product substantially free of water, solids, and precipitated asphaltenes, and bitumen froth tailings, said process comprising the steps of:(a) prov
[ We claim:] [1.] A process for the extraction and recovery of bitumen from bitumen froth generated from tar sands and thereby produce a dilute bitumen product substantially free of water, solids, and precipitated asphaltenes, and bitumen froth tailings, said process comprising the steps of:(a) providing an aqueous bitumen froth concentrate produced from tar sands;(b) subjecting said bitumen froth concentrate to a counter-current decantation process using an organic solvent and thereby producing a dilute bitumen product substantially free of water, solids, and precipitated asphaltenes and a bitumen froth tailings product, comprising either separately or intimately mixed residual bitumen, solvent, water, solids, and precipitated asphaltenes;(c) subjecting said bitumen froth tailings to gravity separation to produce a residual bitumen phase, a solvent, precipitated asphaltenes, and water phase, and a water and solids phase;(d) treating said residual bitumen phase produced in step (c) by recycling it to the counter-current decantation system;(e) biochemically treating said solvent, precipitated asphaltenes, and water phase produced in step (c) by isolating a mixed bacterial culture therefrom or from a non-indigenous source by inoculating a nutrient specific to the growth of said culture with a portion of said solvent, asphaltenes, and water phase to form an inoculum;(f) incubating said inoculum in an isothermal environment for an amount of time sufficient to produce a solid-liquid mixture comprising a bioliquor phase, containing biosurfactants, solvent, and water, and a solids phase, containinga reduced amount of precipitated asphaltenes and biomass;(g) separating said solid-liquid mixture produced in step (f) thereby producing a separate bioliquor product and a solid residue as tailings;(h) filtering said water and solids phase produced in step (c) to produce filtered solids which are discarded as tails and a water filtrate which is recycled to said tar sands treatment process.
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