Conversion of carbon dioxide to hydrocarbons via hydrogenation

摘要

Carbon dioxide conversion processes are described for the conversion of carbon dioxide via hydrogenation to hydrocarbons. The process utilizes an initial feed of carbon monoxide and hydrogen converted under Fischer Tropsch conditions to hydrocarbons followed by subsequent displacement of the carbon monoxide in the reactor feed with carbon dioxide, which is then converted to carbon monoxide under reverse water gas shift conditions and the initial carbon monoxide feed being terminated once the reverse water gas shift conversion of carbon dioxide. After the optimum reaction conditions are established the feed of carbon monoxide may be withdrawn and any required carbon monoxide provided via reactor effluent recycle. The process provides for enhanced catalyst performance and life.

主权项

1. A process for the conversion of carbon monoxide and carbon dioxide to hydrocarbons via hydrogenation, which process comprises:
a) initially introducing a reactor feed comprising carbon monoxide and hydrogen to a reactor operated under Fischer Tropsch conditions for a period of time sufficient to initiate the conversion of carbon monoxide to produce hydrocarbons; b) subsequently introducing carbon dioxide into the reactor while reducing the amount of carbon monoxide initially introduced into the reactor feed according to step (a), under conditions to maximize the conversion of carbon dioxide to carbon monoxide within the reactor via the reverse water gas shift reaction; and c) maintaining operation of the reactor to produce hydrocarbons using the carbon monoxide generated in step (b), without continued introduction of carbon monoxide according to step (a) via the initial reactor feed.