A combined experimental and simulation study for the separation of carbon dioxide and methane mixtures using NH2-MIL-53(Al) as adsorbent is presented. A fixed-bed model has been applied to simulate binary breakthrough experiments obtained in small lab-scale equipment (10cm column, 1/4″ in diameter, 800mg sample). A mixed Langmuir/Langmuir-Freundlich isotherm is used to capture the temperature dependence of the two-step isotherm and a linear driving force model to capture diffusion in the MOF crystals. The model is able to describe the experimental breakthrough data at 273K over a pressure range of 1 to 20bar. Displacement of methane by carbon dioxide, a large apparent roll-up effect, heats of adsorption and dispersion phenomena have been quantified taking into account post-column volumes often present in lab-scale equipment. The heat effects result in a maximum local temperature rise up to 20K.
- Carbon dioxide separation
- Gas separation
ASJC Scopus subject areas
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering