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

Claim 14:
15. A system for sulfur recovery from Claus tail gas, the system comprising:
a hydrogenation reactor configured to convert sulfur-containing compounds in a Claus tail gas stream to hydrogen sulfide to produce a hydrogenated gas stream;
a quench tower fluidically connected to the hydrogenation reactor and configured to receive the hydrogenated gas stream and produce a quenched gas stream by condensing liquid water into a water condensate stream;
a first stage adsorption unit comprising a first stage adsorption vessel that, during a first stage adsorption cycle, is fluidically connected to the quench tower and configured to receive the quenched gas stream and to produce a first outlet gas stream by adsorbing water from the quenched gas stream;
a second stage adsorption unit comprising a second stage adsorption vessel that, during a second stage adsorption cycle, is fluidically connected to the first stage adsorption vessel and configured to receive the first outlet gas stream and to produce a second byproduct gas stream by adsorbing hydrogen sulfide from the first outlet gas stream;
a carbon dioxide separation element configured to receive at least a portion of the second byproduct gas stream and to separate the portion of the second byproduct gas stream into a carbon dioxide stream and an enriched nitrogen stream;
in which the second stage adsorption vessel, during a second stage regeneration cycle, is configured to receive a portion of the enriched nitrogen stream.