Method and apparatus for the solvent extraction of

专利名称：Method and apparatus for the solvent

extraction of oil from bitumen containing tarsand

发明人：William J. Rosenbloom申请号：US08/366261申请日：19941229公开号：US05534136A公开日：19960709

摘要：A method and apparatus for extracting bitumen whereby tar sand containingbitumen components is contacted with a heated thinning oil mixture to reduce the tarsand viscosity and dissolve bitumen to form a lower viscosity feed slurry. The feed slurryis contacted with a light oil in a separator wherein the mixture is separated into productoil and oil sand. The oil sand is washed with solvent in a countercurrent fashion to extractoccluded oil to form the light oil. Washed sand containing solvent is heated above theboiling point of the solvent in a multi- hearth solvent recovery furnace to vaporize thesolvent. The solvent vapors are stripped from the sand by flowing inert gas through thesand in the multi-hearth solvent recovery furnace. Inert gas containing solvent vapors isdirected from the multi-hearth solvent recovery furnace to a heat exchanger/scrubberwhere the inert gas and solvent vapors are contacted with product oil from theseparator. The solvent vapors are absorbed by the product oil to form the heatedthinning oil mixture which is contacted with the tar sand. The resulting thinning oiltemperature is greater than the product oil due to heat transfer from the solvent vaporsand inert gas. Inert gas is recycled from the heat exchanger/scrubber back to the multi-

hearth solvent recovery furnace.

申请人：ROSENBLOOM; WILLIAM J.

代理机构：Ware, Fressola, Van Der Sluys & Adolphson

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