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US 2021/0380409 A1Published application
Process for separation of hydrogen and oxygen produced from photocatalytic water splitting by absorption
AssigneeSabic Global Technologies B.V.
InventorsNasser Ali Aldalaan, Abdulaziz M. Al-Jodai, Mubarik Ali Bashir, Ashwin Ravi Sankar
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Abstract
Embodiments of the invention are directed to methods, processes, and systems for safely and reliably purifying hydrogen from a gas mixture containing hydrogen and oxygen.
Claims21
-20. (canceled)
A process for separating hydrogen and oxygen from a gas mixture produced from photocatalytic splitting of water comprising:
- (a) compressing a feed source gas comprising oxygen and hydrogen to at least 1.0 MPa at ambient temperature;
- (b) pressurizing a solvent to at least 1.0 MPa at ambient temperature, wherein the solvent is capable of selectively adsorbing oxygen when under a pressure of at least 1.0 MPa;
- (c) separating hydrogen and oxygen present in the feed source by solvent adsorption comprising,
- (i) passing the compressed solvent through an adsorption column at a pressure of at least 1.0 MPa;
- and
- (ii) passing the compressed feed source gas through an adsorption column at a pressure of at least 1.0 MPa counter to the pressurized solvent, the pressurized solvent selectively adsorbing oxygen from the feed source gas producing an enriched hydrogen product gas and an oxygen enriched solvent;
- and
- (iii) separating the hydrogen product gas and the oxygen enriched solvent;
- and
- (d) collecting, storing, or utilizing the hydrogen product gas;
- wherein the solvent comprises dimethyl ether of polyethylene glycol.
8 more elements
A gas purification system comprising:
- (a) an adsorption column configured to (i) receive a feed source gas in the lower half of the column so that the feed gas travels up the column, and (ii) receive a solvent in the upper half of the column so that the solvent travels down the column, wherein the solvent selectively adsorbs oxygen and exits the column as an oxygen enriched solvent and the feed source gas is processed while traversing the column and exits the top of the column as a hydrogen product gas;
- and
- (b) a solvent reservoir or source configured to provide lean solvent to the adsorption column;
- and
- (c) a feed gas source configured to provide a feed source gas to the adsorption column.
2 more elements
The process gas purification system of claim 3, wherein the absorption column is selected from the group consisting of a tray column, a packed column, spray tower, bubble column and a centrifugal contactor.
Dependencies are inferred from the claim text.