CO2capture technology combined with bulk separation and purification processes has become an attractive alternative to reduce capture costs. Furthermore, the required purity in the application for CO2conversion and utilization is more stringent than that required from a captured CO2mixture for geological storage. In this study, an adsorptive cyclic purification process was developed to upgrade a CO2/N2mixture captured from greenhouse gas emission plants as a feasibility study for a second capture unit or captured CO2purifier. To purify 90% CO2with balance N2as a captured gas mixture, two-bed pressure swing adsorption and pressure vacuum swing adsorption (PVSA) processes using activated carbon were experimentally and theoretically studied at adsorption pressures of 250–650 kPa and a fixed vacuum pressure of 50 kPa. CO2with higher than 95% purity was produced with more than 89% recovery. However, a four-bed PVSA process could successfully produce CO2with greater than 98% purity and 90% recovery.
Bibliographical noteFunding Information:
The authors gratefully acknowledge the financial support provided for this work by the Korea Institute of Energy Technology Evaluation and Planning (no. 20158510011280), the Ministry of Trade, Industry & Energy and R&D Convergence Program of MSIP (Ministry of Science, ICT and Future Planning), NST (National Research Council of Science & Technology) of Republic of Korea (CRC-14-1-KRICT).
All Science Journal Classification (ASJC) codes
- Environmental Engineering
- Chemical Engineering(all)