This report presents the results of an independent assessment (by University of Edinburgh, UoE) of the likely achievable separation performance from a rotary wheel adsorber using carbon monolith adsorbents. UoE selected what it considered the best available grade of carbon, measured adsorption isotherms for N2 and CO2 and modelled the performance of a rotary adsorber for two alternative cycles.The simulation results showed that 90% recovery and 97% purity could be achieved.