Patent ID: 7982078
Filing Date: 2011-07-19
Classification: C10G,C10L,Y02E,Y02P

Abstract:
1. A process for producing a branched paraffin-rich diesel product from a renewable feedstock comprising: a) treating the renewable feedstock in a first reaction zone by hydrogenating and deoxygenating the feedstock using a catalyst at reaction conditions in the presence of hydrogen and at least one sulfur containing compound to provide a first reaction zone product stream comprising hydrogen, hydrogen sulfide, carbon dioxide, and a hydrocarbon fraction comprising n-paraffins useful as a diesel boiling range fuel; b) selectively separating, in a hot high pressure hydrogen stripper, a gaseous stream comprising hydrogen, hydrogen sulfide, and at least a portion of the water and carbon dioxide from the first reaction zone product stream and introducing a remainder stream comprising at least the n-paraffins to a second reaction zone to contact an isomerization catalyst at isomerization conditions to isomerize at least a portion of the n-paraffins and generate a branched paraffin-rich stream; combining the branched-paraffin-rich stream and the gaseous stream to form a combined stream and s will replace all prior versions, and listings, of claims in the application; c) cooling and separating to provide: d) selectively separating the gaseous component in a first amine solution absorber zone to produce a stream comprising at least hydrogen and depleted in carbon dioxide and a stream comprising carbon dioxide and hydrogen sulfide; e) selectively separating the stream comprising carbon dioxide and hydrogen sulfide in a second amine solution absorber zone to produce a stream comprising at least hydrogen sulfide and depleted in carbon dioxide and a stream comprising carbon dioxide; and f) recycling at least a portion of the stream comprising at least hydrogen and depleted in carbon dioxide and at least a portion of the stream comprising at least hydrogen sulfide and depleted in carbon dioxide to the first reaction zone.