Elevated temperature hydrogen/carbon dioxide separation process simulation by integrating elementary reaction model of hydrotalcite adsorbent

摘要

An elementary reaction kinetics model related with Elovich equation is developed to predict the CO_2 adsorption capacity and adsorption kinetic behavior for potassium promoted hydrotalcite-like compound (K-promoted HTlcs). The elementary reaction kinetics model is comprehensively validated by experimental data from both atmosphere pressure thermo gravimetric analysis (TGA) and a high pressure adsorption apparatus. The elevated temperature pressure swing adsorption s(PSA) system modeling framework is then developed on the gPROMS commercial simulation platform by further considering comprehensive coupling effects from mass, momentum and energy transport processes, integrated with dynamic boundary condition and realistic operating procedures. The effects of adsorption time, residence time, purge to feed ratio, working pressure and adsorbents capacity on PSA cycling gas separation performance are studied with the proposed modeling framework based on a four-bed two-pressure-equalization PSA process.