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US 11,572,274 B2Granted
Adsorption-based Claus tail gas treatment through regeneration temperature ramping
AssigneeSaudi Arabian Oil Company
InventorsGeorgios Lithoxoos, Rashid M. Othman, Ismail A. Alami, Sebastien A. Duval
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Abstract
A system and method for sulfur recovery, including hydrogenating Claus tail gas, quenching the hydrogenated gas, adsorbing water and hydrogen sulfide from the quenched gas, and regenerating adsorbent with carbon dioxide and/or nitrogen and heating the adsorbent in a regeneration temperature ramp to desorb primarily hydrogen sulfide in a first part of the temperature ramp.
Claims22
A method for sulfur recovery, comprising:
- hydrogenating Claus tail gas to produce hydrogenated gas comprising hydrogen sulfide, water, and at least of one of carbon dioxide or nitrogen;
- processing the hydrogenated gas in a quench tower to produce quenched gas comprising hydrogen sulfide, water, and at least one of carbon dioxide or nitrogen;
- feeding the quenched gas to an adsorbing first-stage adsorption vessel;
- adsorbing water from the quenched gas onto first adsorbent in the adsorbing first-stage adsorption vessel to produce a first outlet gas, the first outlet gas comprising hydrogen sulfide and at least one of carbon dioxide or nitrogen;
- feeding the first outlet gas to an adsorbing second-stage adsorption vessel;
- adsorbing hydrogen sulfide from the first outlet gas onto second adsorbent in the adsorbing second-stage adsorption vessel to produce a second byproduct stream comprising at least one of carbon dioxide or nitrogen;
- feeding a first portion of the second byproduct stream as regeneration gas to a regenerating first-stage adsorption vessel;
- and
- heating the regenerating first-stage adsorption vessel in a temperature ramp to selectively desorb components from first adsorbent in the regenerating first-stage adsorption vessel to produce a first byproduct stream comprising desorbed components, wherein the components desorbed during a first part of the temperature ramp comprise primarily hydrogen sulfide.
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A system for treating Claus tail gas, comprising:
- a hydrogenation reactor to receive the Claus tail gas and hydrogenate sulfur-containing compounds in the Claus tail gas into hydrogen sulfide to produce hydrogenated gas comprising hydrogen sulfide, water, and at least one of carbon dioxide or water;
- a quench tower to receive the hydrogenated gas and condense water in the hydrogenated gas to produce quenched gas comprising hydrogen sulfide, water, and at least of one carbon dioxide or nitrogen, wherein condensed water is recovered as water condensate from the quench tower;
- a first first-stage adsorption vessel to receive in an adsorption cycle the quenched gas and adsorb water from the quenched gas onto first adsorbent to produce a first outlet gas comprising hydrogen sulfide and at least one of carbon dioxide or nitrogen;
- a first second-stage adsorption vessel to receive in an adsorption cycle the first outlet gas and adsorb hydrogen sulfide from the first outlet gas onto second adsorbent to produce a second byproduct stream comprising at least one of carbon dioxide or nitrogen;
- and
- a second first-stage adsorption vessel to receive in a regeneration cycle a first portion of the second byproduct stream as regeneration gas and heat first adsorbent in second first-stage adsorption vessel per a temperature ramp to selectively desorb components from the first adsorbent in the second first-stage adsorption vessel to produce a first byproduct stream comprising desorbed components and at least one of carbon dioxide or nitrogen, wherein the components desorbed during a first part of the temperature ramp comprise primarily hydrogen sulfide.
3 more elements
Dependencies are inferred from the claim text.