Carbon dioxide equilibrium absorption in the multi-component systems Of CO2+TIPA+MEA+H2O, CO2+TIPA+Pz+H2O and CO2+TIPA+H2O at low CO2 partial pressures:: experimental solubility data, corrosion study and modeling with artificial neural network

The equilibrium solubility data of CO2 were measured in the various aqueous solutions of TIPA, TIPA + MEA and TIPA + Pz in various concentrations and temperatures ranging from 30 to 70 degreesC, and CO2 partial pressures below atmospheric pressure. They show that increasing the MEA/TIPA ratio and the addition of some piperazine to the TIPA solution, increases the M loading in the solutions, with MEA being more efficient than piperazine. Furthermore, it is obvious that aqueous TIPA solution has the maximum CO2 absorption capacity at 2 mol/dm(3). ANN modeling was carried out to simulate some of experimental data, and proper accommodation between experimental and calculated results was observed. Some immersion corrosion tests were performed on steel-304 and ST-37 alloys and no corrosion was observed. Viscosities of the used solutions were also measured. (C) 2003 Elsevier B.V. All rights reserved.