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H2S more rapidly than via the sour syngas. This approach was successful and sour syngas started to pass through the guard bed on 10/21. The PSA was then started on the sour syngas feed. The PSA operated for a total of 12 days, or 1460 PSA cycles, on the sour syngas. The guard beds accepted sour syngas for a total of roughly 625 hours. In addition to processing sour sygnas, the PSA was operated for another 560 cycles on syngas that did not contain H2S (before breakthrough in the guard beds). Five separate PSA operating points were characterized, two for syngas without H2S and three for sour syngas. In all cases, the PSA operated at a feed pressure of ~300 psig, then was depressurized and purged at about 5 psig. Performance results for one of the sour gas runs are listed below. The overall mass balance was within 1%, while component balances were within about 8%. The PSA rejected nearly all of the H2S (99.7%) and more than 95% of the CO2 in the feed gas. Product gas purity was maintained at 1.4 ppm H2S even though the feed level was around 250 ppm. The recovery of H2 to the product gas was 72%. Simulations are underway to compare the model predictions with these performance values. The PSA system appeared to yield the same performance when similar process setpoints were used at the beginning and end of the sour gas testing, suggesting that the adsorbent characteristics remained stable through that period.PDF Image | Air Products Pressure Swing Adsorption at the National Carbon Capture Center
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