Production of diesel fuel from biorenewable feedstocks with selective separation of converted oxygen

摘要

A process has been developed for producing diesel boiling range fuel from renewable feedstocks such as fats and oils from plants and animals where the process provides for sulfur-component management. The process involves catalytically treating a renewable feedstock by hydrogenating and deoxygenating to provide a hydrocarbon fraction useful as a diesel boiling range fuel. A selective separation such as a hot high pressure hydrogen stripper may be used to remove at least the carbon oxides from the first zone effluent and provide a liquid recycle stream at pressure and temperature. A vapor stream is separated from the net process effluent and at least carbon dioxide is removed using at least one selective or flexible amine absorber. The resulting hydrogen-rich stream is recycled to the reaction zone.

主权项

1. A process for producing a paraffin-rich diesel boiling range product from a renewable feedstock comprising:
a) treating the feedstock in a reaction zone by hydrogenating and deoxygenating the feedstock using at least one catalyst at reaction conditions in the presence of hydrogen and at least one sulfur containing component to provide a reaction zone product stream comprising hydrogen, hydrogen sulfide, carbon dioxide, water, and a hydrocarbon fraction comprising paraffins useful as a diesel boiling range fuel; b) selectively separating the reaction zone product stream into a gaseous stream comprising hydrogen, hydrogen sulfide and at least a portion of the water and carbon oxides from the reaction zone product stream and a remainder stream comprising at least the paraffins; c) separating:
i. a gaseous component comprising at least hydrogen, hydrogen sulfide, water, and carbon dioxide;ii. a hydrocarbon component; andiii. a water component;and recovering a portion of the hydrocarbon component; d) recycling a portion of the remainder stream comprising at least the paraffins or a portion of the hydrocarbon component to the reaction zone; e) selectively separating the gaseous component using at least one amine absorber zone to produce at least a stream containing at least hydrogen and depleted in carbon dioxide; and f) recycling the stream containing at least hydrogen and depleted in carbon dioxide to the reaction zone.