Pressure swing adsorption for CO2 capture in Fischer-Tropsch fuels production from biomass

Abstract

Environmental concerns and oil price rises and dependency promoted strong research in alternative fuel sources and vectors. Fischer-Tropsch products are considered a valid alternative to oil derivatives having the advantage of being able to share current infrastructures. As a renewable source of energy, synthesis gas obtained from biomass gasification presents itself as a sustainable alternative. However, prior to hydrocarbon conversion, the bio-syngas must be conditioned, which includes the removal of carbon dioxide for subsequent sequestration and capture. A pressure swing adsorption cycle was developed for the removal and concentration of CO 2 from the bio-syngas stream. Activated carbon was chosen as adsorbent. The simulation results showed that it was possible to produce a (H 2 + CO) product with a H 2 /CO stoichiometric ratio of 2.14 (suitable as feed stream for the Fischer-Tropsch reactor) and a CO 2 product with a purity of 95.18%. A CO 2 recovery of 90.3% was obtained. A power consumption of 3.36 MW was achieved, which represents a reduction of about 28% when compared to a Rectisol process with the same recovery.Keywords PSA · Fischer-Tropsch · CO 2 capture · Biomass · Biosyngas Abbreviations Notation a p particle specific area (m −1 ) A virial coefficients (m 2 mol −1 ) B virial coefficients (m 4 mol −2 )

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