Gas conversion with rejuvenation ammonia removal
AssigneeExxon Research & Engineering Co.
InventorsRussel J. Koveal, Dennis G. Alexion
Life of this patent
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Abstract
A gas conversion process includes producing a synthesis gas which contains ammonia and hydrogen cyanide and forms hydrocarbons by reacting the hydrogen and carbon monoxide in the gas in the presence of a hydrocarbon synthesis catalyst also reversibly deactivates the catalyst due to the presence of the ammonia and hydrogen cyanide in the gas. The catalyst is rejuvenated with a gas comprising hydrogen and produces an ammonia containing rejuvenation offgas. The ammonia is dissolved out of the offgas with water and then stripped out of the water with the hydrocarbon feed to the synthesis gas generator and into the generator where it is consumed.
Claims16
A gas conversion process which comprises generating a synthesis gas comprising H.sub.2 and CO from a feed comprising hydrocarbon gas in a synthesis gas generator, contacting said synthesis gas with a hydrocarbon synthesis catalyst at reaction conditions effective to react said H.sub.2 and CO and form hydrocarbons and reversibly deactivate said catalyst, rejuvenating said deactivated catalyst with a gas comprising hydrogen to form an offgas containing ammonia, dissolving said ammonia out of said offgas with water, and stripping said ammonia out of said water and into said generator, with said hydrocarbon feed gas, in which said ammonia is consumed and which produces clean water.
A gas conversion process which comprises:
- (a) producing, from a feed which comprises a sulfur reduced hydrocarbon gas, a synthesis gas comprising a mixture of H.sub.2 and CO and which also contains ammonia and hydrogen cyanide, in a synthesis gas generator comprising a reaction zone for forming said synthesis gas;
- (b) contacting said synthesis gas with water in a high energy contacting means and separating said water from said gas;
- (c) converting said most of said cyanide in said separated gas produced in step (b) to ammonia to form a cyanide reduced gas containing water vapor and ammonia;
- (d) cooling said cyanide reduced gas to condense out a portion of said vapor as an aqueous solution of said ammonia to form a synthesis gas reduced in ammonia;
- (e) scrubbing said ammonia reduced gas with water to dissolve more ammonia out of said gas to form a synthesis gas further reduced in ammonia;
- (f) contacting said synthesis gas produced in step (e) with a hydrocarbon synthesis catalyst and reacting said H.sub.2 and CO in the presence of said catalyst at reaction conditions effective to form hydrocarbons and reversibly deactivate said catalyst;
- (g) contacting said catalyst with a gas comprising hydrogen to rejuvenate it and produce a rejuvenation offgas containing ammonia;
- (h) contacting said offgas with water to dissolve said ammonia out of said gas and form an aqueous ammonia solution and separating said solution from said offgas, and
- (i) stripping said ammonia out of said water and into said generator, with said hydrocarbon gas, in which said ammonia is consumed in said reaction zone and which produces clean water.
Dependencies are inferred from the claim text.