Coalseam methane gas recovery using pressure and vacuum swing adsorption (PSA/VSA) processes were investigated both theoretically and experimentally. CO2 is more strongly adsorbed and also diffuses faster compared to methane and nitrogen in a carbon-based adsorbent. Hence such adsorbents are suitable for methane recovery. Carbon molecular sieve adsorbents were employed for testing the technical feasibility of the adsorption process. Numerical simulations indicate that the purity of methane gas recovered can be greater than 90%, by switching from PSA to VSA operation. The effect of process cycle time, purge pressure and feed flow rates were investigated. Both model predictions and laboratory experiments show promising separation performance. This study shows that a relatively untapped source of methane from coalseam gas can be economically recovered for industrial applications.