Hydrogen purification by adsorption
AssigneeAir Products and Chemicals, Inc.
InventorsTimothy Christopher Golden, Shubhra Jyoti Bhadra, Shreya Mukherjee, Garret C. Lau, Jeffrey R. Hufton, Jay A. Thakkar
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Abstract
A method for purifying a crude hydrogen feed stream utilizes an adsorbent having a N2/Ar selectivity ranging from 2 to 4 at 30° C. and a Henry's law coefficient for argon ranging from 0.15 to 1.0 mmole/g/atma at 30° C. The composition of crude hydrogen streams from processes in which carbon dioxide is captured necessitates new criteria for adsorbent selection to improve recovery.
Claims18
A method for purifying a crude hydrogen feed stream comprising argon and nitrogen, the method comprising:
- feeding the crude hydrogen feed stream to an adsorption apparatus comprising a discharge end adsorption layer comprising a first adsorbent having a N2/Ar selectivity ranging from 2 to 4 at 30° C. and a Henry's law coefficient for argon ranging from 0.15 to 1.0 mmole/g/atma at 30° C.;
- and
- collecting a product gas from the adsorption apparatus.
A method for purifying a crude hydrogen feed stream comprising argon and nitrogen, the method comprising:
- feeding the crude hydrogen feed stream to an adsorption apparatus comprising a discharge end adsorption layer comprising a first adsorbent having a silicon to aluminum ratio ranging from 2.5 to 50;
- and
- collecting a product gas from the adsorption apparatus;
- wherein the first adsorbent is exchanged with greater than or equal to 30% sodium ions.
A method for purifying a crude hydrogen feed stream comprising argon and nitrogen, the method comprising:
- feeding the crude hydrogen feed stream to an adsorption apparatus comprising a discharge end adsorption layer comprising a first adsorbent having a silicon to aluminum ratio ranging from 2.5 to 50;
- and
- collecting a product gas from the adsorption apparatus;
- wherein the crude hydrogen feed stream comprises more than 0.01% argon by volume.
A method for purifying a crude hydrogen feed stream comprising argon and nitrogen, the method comprising:
- feeding the crude hydrogen feed stream to an adsorption apparatus comprising a discharge end adsorption layer comprising a first adsorbent having a silicon to aluminum ratio ranging from 2.5 to 50;
- and
- collecting a product gas from the adsorption apparatus;
- wherein the first adsorbent has a heat of adsorption of argon ranging from 4 to 5 kcal/mol.
Dependencies are inferred from the claim text.