The aim of this work was to find out the carbon dioxide (CO2) gas solubility in 20 wt. aqueous piperazine (PZ) solution. For this purpose, SOLTEQ BP 22 solubility cell was used and experiments were conducted at temperatures (313.15 and 333.15) K by varying the pressure of CO2 from 2 to 10 bar. The experimental results of solubility (mol CO2/mol PZ) revealed that the solubility decreased with increase in temperature and increased with increase in pressure. Further the potential of piperazine as CO2 absorbent was identified by comparing its experimental solubility data with 20 wt. 2-Amino-2-hydroxymethyl-1,3-propanediol (AHPD) solution over a certain range of pressure and at same temperature. The results showed that AHPD has higher loading capacity than PZ up to 8 bar pressure, but for higher pressure PZ has more CO2 loading capacity than AHPD. © 2016 The Authors.