Two models have been developed for prediction of CO₂ solubility in piperazine, PZ aqueous solution.

The models are based on CHPSO-ANFIS and CSA-LSSVM approaches.

The experimental data gathered from the literature were used for model development.

The effectiveness and accuracy of the models were evaluated by statistical and graphical approaches.

CHPSO-ANFIS model yields more accurate predictions compared to CSA-LSSVM model.