Sour pressure swing adsorption process
First Claim
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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.
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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.
47 Citations
18 Claims
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1. A method comprising:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method comprising:
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(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. - View Dependent Claims (16, 17)
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18. A method comprising:
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(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).
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Specification