Carbon Dioxide Separation From Binary Gas Mixture Containing High Carbon Dioxide Content By Pressure Swing Adsorption Utilizing Organic And Inorganic Adsorbents
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Date
2019-06-01
Authors
Abdullah, Aman
Journal Title
Journal ISSN
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Publisher
Universiti Sains Malaysia
Abstract
Carbon dioxide (CO2) gas enrichment and separation process have been
researched for decades and various methods are being applied in industries to reduce
and resist CO2 gas due to its corrosive characteristics and negative effects on
environment. Greenhouse gases such as methane (CH4) and CO2 are the most
abundant in natural gas wells. They contribute significant negative effects to global
warming. In this research, Pressure swing adsorption method was utilized as a
mechanism to capture and recover binary gas via gas separation process by
adsorbents. The adsorbents used in this study were Zeolite 5A, Zirconium-benzene
dicarboxylate (UiO-66) and activated carbons made from Kenaf and palm kernel
shell (PKS) within the pressure differences of up to 3 bars. The adsorbents were
prepared and characterized using X-Ray Diffraction (XRD) analysis, Brunauer–
Emmett–Teller (BET) analysis, Scanning Electron Microscope (SEM) analysis,
Energy Dispersive X-Ray (EDX) analysis and particle size distribution analysis.
Adsorbents selection and their capability were tested using binary mixture gas of
70% CO2 and 30% CH4 via breakthrough studies using volumetric method. The
experimental data were collected by manipulating the adsorption and desorption time
ranging up to 4 minutes. The results show that CO2 gas had higher affinity than CH4
for these adsorbents. Adsorbent saturation period declined towards increasing
pressure and vice versa. Experimental data showed that activated carbon made from
palm kernel shell yielded the optimum purity and recovery of CH4 and CO2 gases.
Purity of CH4 and CO2 of 85% and 94% respectively were successfully achieved at
recovery of CH4 and CO2 of 94% and 89% respectively. The other adsorbents were
saturated quickly and less effective for high carbon dioxide content separation.