Investigating the Equilibrium Solubility of Carbon Dioxide in the
Mixture of Triethanolamine, Piperazine and Water by Using CPA Equation
of State
Abstract
In this study, the CO2 gas absorption process has been investigated
modeling in order to find suitable adsorbent, as well as determination
of the solubility and mass transfer mechanism. To calculate the
solubility of CO2 in a solution of triethanolamine and piperazine, the
CPA state equation will be used to predict the properties of the system.
The results show that with increasing pressure, the absorption of Co2 in
the gas phase increases due to the increase of the CO2 absorption of
density gradient. By increasing the temperature, the amount of CO2
absorbed in the adsorbent solution decreases, due to the calorific of
the Co2 absorption by the use of an amine absorbent solution. Also, by
increasing the concentration of piperazine in the amine absorbent
solution, the amount of CO2 absorption increases as a result of
increasing the reaction rate of the amine solution with CO2 in the
presence of piperazine. The highest overall error rate obtained from the
reported data for operating pressure, temperature and piperazine
concentrations variable is 7.3%, 7.4% and 4%, which is considered an
acceptable error rate, respectively.