(634e) Optimization of a High Temperature PSA Process for Pre-Combustion CO2 Capture
AIChE Annual Meeting
Thursday, November 17, 2016 - 9:58am to 10:20am
High-pressure dynamic column breakthrough experiments have been performed using a bench scale fixed bed reactor system over a wide range of temperatures. The adsorption isotherms and kinetic parameters for CO2 and H2 were measured by fitting the experimental breakthrough responses with those simulated using a detailed adsorption model. Based on these parameters, a variety of PSA cycles, that include pressure equalization, blow down and steam purge steps were designed. Using a detailed model coupled with a genetic algorithm toolbox, these PSA cycles were optimized for maximizing CO2 purity and recovery. Using this approach, we were able to show that many cycle configurations do achieve high CO2 purity (>95%) and recovery (>90%) that are recommended by the DOE for sequestration. For those cycles that satisfied the high purities and recoveries, the problem of minimizing parasitic energy was studied. Factors such as energy consumption for CO2 compression, loss of H2 into the desorption product, steam utilization were all combined into a single objective function. The cycle parameters such as various pressure levels, step time and feed velocities were used as decision variable while the CO2 purity and recovery were used as a constraint. The results of this optimization study will be discussed at the meeting.