US 9,808,755 B2
Sour pressure swing adsorption process
Shubhra Jyoti Bhadra, Macungie, PA (US); Andrew David Wright, Guildford (GB); Jeffrey Raymond Hufton, Fogelsville, PA (US); Jeffrey William Kloosterman, Allentown, PA (US); Fabrice Amy, Macungie, PA (US); and Edward Landis Weist, Jr., Macungie, PA (US)
Assigned to Air Products and Chemicals, Inc., Allentown, PA (US)
Filed on Jul. 24, 2015, as Appl. No. 14/808,069.
Prior Publication US 2017/0021301 A1, Jan. 26, 2017
Int. Cl. B01D 53/047 (2006.01); C01B 3/56 (2006.01); C01B 17/04 (2006.01)
CPC B01D 53/047 (2013.01) [C01B 3/56 (2013.01); C01B 17/0404 (2013.01); B01D 2256/16 (2013.01); B01D 2256/22 (2013.01); B01D 2257/304 (2013.01); B01D 2257/504 (2013.01); B01D 2257/70 (2013.01); B01D 2259/40056 (2013.01); B01D 2259/4067 (2013.01); B01D 2259/41 (2013.01); C01B 2203/0283 (2013.01); C01B 2203/042 (2013.01); C01B 2203/043 (2013.01); C01B 2203/047 (2013.01); C01B 2203/048 (2013.01); C01B 2203/0475 (2013.01); C01B 2203/0485 (2013.01); C01B 2203/061 (2013.01); C01B 2203/068 (2013.01); C01B 2203/86 (2013.01); Y02C 10/08 (2013.01); Y02P 30/30 (2015.11)] 18 Claims
OG exemplary drawing
1. A method comprising:
(a) gasifying a carbonaceous feedstock to form a gasified stream comprising H2S, CO2, CO and H2;
(b) converting at least a portion of the CO in the gasified stream to CO2 and H2 using a water-gas shift reaction, resulting in a sour syngas stream;
(c) introducing the sour syngas stream into a sour pressure swing adsorption (SPSA) system having a plurality of adsorber beds;
(d) performing a cyclic PSA process using the SPSA system comprising the following steps:
(i) pressurizing a first bed of the plurality of adsorber beds to a first pressure;
(ii) feeding the sour syngas stream into an inlet end of the pressurized first bed and discharging a first gas stream from an outlet end of the first bed;
(iii) after the feeding step, introducing a rinse gas comprising at least 99 mol % N2 into the first bed, the rinse gas being from a source other than directly from another of the plurality of adsorber beds;
(e) removing a product stream from the SPSA system, the product stream having a greater concentration of H2 than the sour syngas stream and comprising at least 80 mol % H2 and at least 10 mol % N2;
(f) removing a tail gas stream from the SPSA system, the tail gas stream having a greater concentration of CO2 and H2S than the sour syngas stream; and
(g) separating the tail gas stream into an H2S-enriched stream and a H2S-depleted stream using an acid gas enrichment (AGE) system.