Pressure Swing Adsorption Process in Coal to Fischer–Tropsch Fuels with CO2 Capture

The carbon dioxide capture by pressure swing adsorption in a coal to Fischer–Tropsch process is addressed. The simulations results show that a (hydrogen + carbon monoxide) product with required composition for Fischer–Tropsch synthesis, H 2 /CO ratio of 2.22, and inerts content of 3.90% can be obtained. Additionally, the PSA process produces high purity carbon dioxide of 95.16% with high recovery of 91.6%. This CO 2 stream is compressed to 110 bar for transportation and storage. The power consumption requirement was calculated to be 311 kW·h/ton CO 2 (191 kW·h/ton CO 2 for separation and 120 kW·h/ton CO 2 for compression), which is too high for competitive operation of the PSA process when compared to absorbent based processes. A modification of the PSA process operation procedure involving the introduction of a number of tanks to collect fractions of the blowdown stream drastically reduces the power consumption to 129 kW·h/ton CO 2 (including separation and compression to 110 bar) without affecting the products specifications.