Abstract
Biomethane is a renewable and clean source of energy, which can be employed to abate the greenhouse gases emissions and support the sustainable developments. Novel plate pressure swing adsorption mediated by a stratified bed containing UiO-66 followed by un-treated biomass-based adsorbent was used for production of ultrapure biomethane from biogas mixture of 30 % CO2 (balanced by CH4). Plate PSA design was proposed due to the exchangeable heat between the adsorption and desorption bed in non-isothermal/non-adiabatic conditions. Breakthrough experiments of CH4 and CO2 for individual and layered bed were conducted to understand the gases behavior in the different systems. The results were also used to determine the appropriate range of PSA operating parameters i.e., the adsorption pressure and adsorption/blowdown time. A quadratic model was built to optimize the pressure and CO2 content in the biogas feed for maximum bio-CH4 purity in the adsorption line. The results revealed that the introduction of UiO-66 layer which was positioned before the un-modified biomass adsorbent improved bio-CH4 purity to 99.99 % and recovery of 69.6 % under the adsorption pressure of 2 bar at room temperature. The optimum point to achieve the ultrapure bio-CH4 was located at pressure of 2 bar, CO2 content of up to 50 % and adsorption/blowdown time of 4 min. In this work, a new layering strategy consisting of different strata of un-treated biomass-based adsorbent and microporous UiO-66 adsorbent was introduced for bio-CH4 purification using plate PSA under non-adiabatic/non-isothermal conditions.
Published Version
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