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CO2 separation from biogas using PEI-modified crosslinked polymethacrylate resin sorbent
Olusola Johnson,Babu Joseph,John N. Kuhn 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.103 No.-
The separation of CO2 from biogas to achieve vehicle/pipeline grade methane is an expensive step. Recently, PEI (polyethyleneimine) impregnated resins have been proposed and evaluated for CO2 separationfrom flue gases and air. However, its use in biogas upgrading and evaluation of the economic feasibilityof such adsorbents have not been explored in detail. In this work, by modifying an inert polymericresin (HP2MGL) using PEI, CO2 was separated from biogas. The sorbent exhibited the highest adsorptioncapacity of 2.7 mmolCO2/gads at 30% PEI loading, increasing to 2.9 mmolCO2/gads in the presence of moisture,and remained stable for up to five adsorption–desorption cycles. In situ DRIFTS studies showed thatCO2 adsorption on PEI-impregnated sorbent is consistent with the zwitterion reaction mechanism, andthe sorbent could be regenerated completely at 100 C. The upgrading cost of biogas is primarily dominatedby the operating cost of regeneration and the adsorbent cost. The economic feasibility analysis suggeststhat PEI-impregnated resin sorbent requires less capital and operating costs than conventionalbiogas upgrading technologies. Therefore, PEI-impregnated polymeric resins are promising for CO2 separationfrom biogas.