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US 9,808,755 B2Granted
Sour pressure swing adsorption process
AssigneeAir Products and Chemicals, Inc.
InventorsShubhra Jyoti Bhadra, Andrew David Wright, Jeffrey Raymond Hufton, Jeffrey William Kloosterman, Fabrice Amy, Edward Landis Weist, Jr.
Life of this patent
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Abstract
Methods and apparatuses for separating CO2 and sulfur-containing compounds from a synthesis gas obtained from gasification of a carbonaceous feedstock. The primary separating steps are performed using a sour pressure swing adsorption (SPSA) system, followed by an acid gas enrichment system and a sulfur removal unit. The SPSA system includes multiple pressure equalization steps and a rinse step using a rinse gas that is supplied from a source other than directly from one of the adsorber beds of the SPSA system.
Claims18
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.
8 more elements
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 85 mol % of one or more selected from the group of CO2 and H2S 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;
- (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.
8 more elements
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 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;
- (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;
- (g) separating the tail gas stream into an H2S-enriched stream and a H2S-depleted stream using an acid gas enrichment (AGE) system;
- and
- (h) recycling at least a portion of the H2S-depleted stream for pneumatically conveying the carbonaceous feedstock in step (a).
9 more elements
Dependencies are inferred from the claim text.