 artificial neural networks, ANN, and response surface methodology, RSM, were applied for modelling and optimisation of carbon dioxide, CO2, absorption using KOH, PZ, CO2 system. The P-value for all dependent variables was obtained to be less than 0.0001, indicating that all models were significant. This article was authored by Hassan Parshay, Hossein Mashhad Mishlam, and Ahod Gini.