	US 11,807,532 B2
	Method of recovering a hydrogen enriched product and CO2 in a hydrogen production unit
Addison Cruz, Chicago, IL (US); Bradley Russell, Carol Stream, IL (US); Erick J. Bennett, III, Orland Park, IL (US); William Cady, Chicago, IL (US); Kurt Kraus, Tulsa, OK (US); Stefano Bietto, Tulsa, OK (US); Kyle Cuellar, Fulshear, TX (US); and Oluwaseyi Kayode, Houston, TX (US)
Assigned to UOP LLC, Des Plaines, IL (US)
Filed by UOP LLC, Des Plaines, IL (US)
Filed on Oct. 22, 2021, as Appl. No. 17/451,941.
Claims priority of provisional application 63/167,341, filed on Mar. 29, 2021.
Prior Publication US 2022/0306464 A1, Sep. 29, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C01B 3/38 (2006.01); C01B 3/48 (2006.01); C01B 32/50 (2017.01); B01D 53/047 (2006.01); B01D 3/14 (2006.01); B01D 53/04 (2006.01); B01D 53/26 (2006.01); C01B 3/50 (2006.01)

CPC C01B 3/382 (2013.01) [B01D 3/143 (2013.01); B01D 53/047 (2013.01); B01D 53/0438 (2013.01); B01D 53/26 (2013.01); C01B 3/386 (2013.01); C01B 3/48 (2013.01); C01B 3/508 (2013.01); C01B 32/50 (2017.08); B01D 2256/16 (2013.01); B01D 2256/22 (2013.01); B01D 2257/102 (2013.01); B01D 2257/108 (2013.01); B01D 2257/11 (2013.01); B01D 2257/502 (2013.01); B01D 2257/504 (2013.01); B01D 2257/7025 (2013.01); B01D 2257/80 (2013.01); B01D 2259/402 (2013.01); B01D 2259/4003 (2013.01); B01D 2259/40015 (2013.01); B01D 2259/40043 (2013.01); B01D 2259/40079 (2013.01); B01D 2259/40081 (2013.01); C01B 2203/0233 (2013.01); C01B 2203/0261 (2013.01); C01B 2203/0283 (2013.01); C01B 2203/042 (2013.01); C01B 2203/0833 (2013.01); C01B 2203/1241 (2013.01); C01B 2203/1288 (2013.01); C01B 2203/148 (2013.01); C01B 2203/1628 (2013.01)]

15 Claims

1. A method of producing a hydrogen-enriched product and recovering CO₂from an effluent stream of a hydrogen production unit comprising:

processing a feed stream comprising hydrocarbons or a carbonaceous feedstock in the hydrogen production unit to produce a synthesis gas mixture comprising hydrogen, carbon dioxide, water and at least one of methane, carbon monoxide, nitrogen, and argon;

separating the effluent stream comprising the synthesis gas in a three-product pressure swing adsorption (PSA) unit that produces at least three product streams into at least a high-pressure hydrogen stream enriched in hydrogen, a hydrogen-depleted low-pressure tail gas stream enriched in carbon dioxide, and a second gas stream, the three-product PSA unit having a three-product PSA cycle, and wherein the second gas stream is produced in a co-current depressurization step in the three-product PSA cycle and has an intermediate pressure between the high-pressure hydrogen stream and the low-pressure tail gas stream;

compressing the hydrogen depleted low-pressure tail gas stream in a compressor to form a compressed tail gas stream;

separating the compressed tail gas stream in a CO₂recovery system into a CO₂-enriched product stream and an overhead stream comprising a portion of the hydrogen, a portion of the carbon dioxide, and the at least one of the methane, the carbon monoxide, the nitrogen, and the argon; and

recovering the high-pressure hydrogen stream.

14. An apparatus for producing hydrogen and recovering CO₂from an effluent stream of a hydrogen production unit comprising:

a hydrogen production process unit having at least one inlet and at least one outlet,

a three-product PSA unit having at least an inlet, a high-pressure hydrogen outlet, an intermediate-pressure second gas outlet, and a low-pressure tail gas outlet, the three-product PSA unit inlet in fluid communication with the outlet of the hydrogen production unit;

a compressor having an inlet and an outlet, the low-pressure tail gas outlet in fluid communication with the compressor inlet;

a CO₂recovery system having an inlet, a first outlet, and an overhead outlet, the CO₂recovery system inlet in fluid communication with the compressor outlet, the CO₂recovery system overhead outlet in fluid communication with the inlet of the CO₂recovery system, the inlet of the three-product PSA unit, or an inlet of a water gas shift process unit, or an inlet of the hydrogen production process unit, or combinations thereof; and

the intermediate-pressure second gas stream outlet in fluid communication with the inlet of the hydrogen production process unit; an inlet to a water gas shift process unit; an inlet to a combustion unit; or an inlet to a catalytic oxidation unit and an outlet of the catalytic oxidation unit in fluid communication with the inlet of the compressor; or combinations thereof.