The reversible chemical absorption using MEA (monoethanolamine), one of alkanolamine, is generally used as a conventionally method for CO2 capture. Even MEA absorbent has excellent reactivity with CO2, it has been known to have the decrease of absorption capacity caused by CO2, O2 or other acid gases in flue gas, corrosion and thermal degradation. In this study, MEA solutions degraded in the steam reforming process of refinery used and the absorption performance were compared for the used of conventional MEA solution. In case of 30 wt% MEA and mixture of 20 wt% thermal degraded absorbent (DP) and 10 wt% PZ, the absorption capacities were 0.5365 mol-CO2/mol-absorbent and 0.5939 mol-CO2/mol-absorbent respectively. PZ added thermally degraded absorbent showed the enhanced absorption capacity. On the contrary, the absorption rates were 1.1610 kgf/cm2ㆍmin for 30 wt% MEA, 0.5310 kgf/cm 2ㆍmin for mixture of 20 wt% thermal degraded absorbent(DP) and 10 wt% PZ and 0.3525 kgf/cm 2ㆍmin for 30 wt% thermally degraded absorbent only. The absorption rates of PZ added thermally degraded absorbent was higher than that of thermally degraded absorbent only. Therefore, it can be confirmed that thermally degraded absorbent can be reused as an absorbent for CO2 by the addition of suitable additives.