Study of Adsorption Characteristics on Active Carbon for Ventilation Air Methane Separation

Abstract

Nine types of active carbon’s adsorption isotherm of nitrogen and methane at 298K, 308K and 318K were measured, and their selectivity factor and PSA sorption selection parameters were calculated. The results show the nine active carbons have desirable selective adsorption characters on methane to nitrogen. AC3 has the highest selectivity factor. It reaches to 5.11 at 298K. And AC3 is the optimal adsorbent in 9 different adsorbents. Its PSA sorption selection parameter is higher than others with the methane concentration of 0.2% at the operating pressure between 50kPa to 150kPa abs. In above conditions the higher the selectivity factor is, the higher the PSA sorption selection parameter will be.

Site Trials of Ventilation Air Methane Enrichment with Two-Stage Vacuum, Temperature, and Vacuum Swing Adsorption

“…There exists separation technologies that can be potentially considered for VAM enrichment, including hydrate-base gas separation, , absorption into ionic liquids, , membrane separation, , and adsorption with solid adsorbents. , As of today, among these technologies, due to their technical and practical limitations, only adsorption-based processes with solid adsorbents have been applied for VAM enrichment by mainly three groups (University of Science and Technology (UST), ,,− Dalian University of Technology (DUT) in China, and CSIRO ,,, in Australia. The first two groups in China have applied a vacuum pressure swing adsorption (VPSA) process with coconut shell-derived composites, the CH 4 adsorption capacities of which at 298 K were about 0.010 and 0.910 mmol/g at 0.67 and 100 kPa, respectively.…”