An experimental and modeling approach to investigate CO₂ solubility in blended aqueous solutions of 2-amino-2-hydroxymethyl-1, 3-propanediol (AHPD) and piperazine (PZ)

In this work, CO₂ solubility was investigated in a blended aqueous solution of 2-amino-2-hydroxymethyl-1,3-propanediol (AHPD) and piperazine (PZ). Concentration of AHPD was varied from (w ​= ​0.13, 0.19, and 0.25), while concentration of PZ was varied from (w ​= ​0, 0.0174, 0.0688, and 0.1035). All experiments were performed at temperatures of 303.15, 313.15, and 333.15 ​K and over a CO₂ pressure range of (5–60) bar. CO₂ solubility was calculated in terms of CO₂ loading (mole of CO₂/mole of amine absorbed). Effect of temperature, equilibrium CO₂ pressure, and PZ concentration on CO₂ loading was examined. Artificial neural network (ANN) model was developed to correlate CO₂ solubility data. It was found that correlated CO₂ solubility data from ANN model were in good agreement with experimental CO₂ solubility data.