CO2 capture at elevated temperatures by cyclic adsorption processes

Capture of CO2 from high temperature process streams, such as those arising in the Integrated Gasification Combined Cycle (IGCC) process, is receiving increasing attention. In this paper, we report the performance of zeolite 13X for CO2 capture from IGCC streams at elevated temperatures. Isotherms of CO2 adsorption on zeolite 13X at 90 degrees C, 120 degrees C, and 200 degrees C were measured and the fitted parameters were used for cyclic adsorption process design. Four different cycles were designed and tested with gas mixtures representing syngas compositions from a coal gasification pilot plant. These four cycles were then applied to CO2 separation from real coal gasification syngas. The experiments carried out with real syngas showed that zeolite 13X can be used for CO2 capture with acceptable performance even with impurities present in the syngas.