Pressure Swing Adsorption for Biogas Upgrading with Carbon Molecular Sieve

Abstract

This work focuses on the study of a pressure swing adsorption (PSA) process for biogas upgrading using a carbon molecular sieve adsorbent. Adsorption equilibrium and diffusion data of pure components were used to predict the multicomponent behavior. To validate the prediction of multicomponent adsorption at different concentrations, breakthrough curve experiments were performed for a gas mixture at different pressures (0.25, 0.5, 1, and 5 bar). Based on basic information, a model was used to predict the performance of a two-column PSA unit. The mixture used as feed was 60% CH 4 and 40% CO 2 with pressure swings between 5 bar in adsorption mode to 0.1 bar in blowdown. Experimental data demonstrated that the model could describe the PSA performance with good accuracy. We have evaluated the influence of different feed times in the biomethane recovery and purity. Biomethane purity higher than 97.5% with recovery higher than 90% was obtained.

Biomass Valorization to Produce Porous Carbons: Applications in CO2 Capture and Biogas Upgrading to Biomethane—A Mini-Review

“…Adsorption-based processes like Pressure-Swing Adsorption (PSA) is one of the most established know-how used in gas separation/purification/ capture applications (Riboldi and Bolland, 2017). Its compacted set of fixed-bed adsorption columns, operating with pressure modulation in a cyclic mode, use the adsorbent(s) to selectively adsorb and desorb the undesired gases like CO 2 in biogas (Esteves, 2005;Esteves and Mota, 2007;Augelletti et al, 2017;Canevesi et al, 2018). The selective adsorption occurs due to different equilibrium capacities of the species (equilibrium adsorbent) or distinct gas uptake rates (kinetic adsorbent) in the adsorbent's surface.…”

Production of negative-emission biomethane by twin double-bed pressure swing adsorption with tail gas sequestration

“…Adsorption technologies have been a promising route for biogas upgrading, and have been commercially deployed due to their low energy demand, low capital investment and operational costs [12][13][14] . Their continuous operation is achieved by three main types of cyclic adsorption processes: pressure swing adsorption (PSA), pressure vacuum swing adsorption (PVSA), and temperature swing adsorption (TSA) [15][16][17][18] .…”

“…PVSA and TSA units require vacuum and heat for adsorbent regeneration, respectively, while PSA does not require energy for this step 19 . Most state-of-the-art cyclic adsorption processes used for biogas upgrading are based on PVSA 12,20,21 .…”

Nitrogen rejection from landfill gas using Pressure Swing Adsorption

“…In more recent studies [13,[19][20][21][22][23] a variety of PSA and VPSA cycle schedules incorporating recycling steps have been reported. Either equilibrium [13,21,24] or kinetic [23,25] based separations for CO 2 removal from LFG use of multilayered adsorbents for improving the process performances especially in terms of methane productivity [19,26,27]. The use of dual PSA [28,29] presents an innovative solution for obtaining high-purity methane with a high CH 4 recovery from a gas mixture containing CH 4 and CO 2 .…”