Patent ID: 11945716
Assignee: SAUDI ARABIAN OIL COMPANY
Field: Chemical engineering (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A method for sulfur recovery, the method comprising:
in a hydrogenation reactor, converting sulfur-containing compounds in a Claus tail gas stream to hydrogen sulfide to produce a hydrogenated gas stream comprising hydrogen sulfide, water, and at least one of carbon dioxide or nitrogen;
feeding the hydrogenated gas stream to a quench tower to produce a quenched gas stream by condensing liquid water into a water condensate stream;
feeding the quenched gas stream to a first stage adsorption vessel of a first stage adsorption unit to produce a first outlet gas stream by adsorbing water from the quenched gas stream;
feeding the first outlet gas stream to a second stage adsorption vessel of a second stage adsorption unit to produce a second byproduct gas stream by adsorbing hydrogen sulfide from the first outlet gas stream;
separating at least a portion of the second byproduct gas stream into a carbon dioxide stream and an enriched nitrogen stream; and
regenerating the second stage adsorption vessel by feeding a portion of the enriched nitrogen stream to the second stage adsorption vessel to produce a second outlet gas stream.