Solubility of H2S in Aqueous Diisopropanolamine + Piperazine Solutions: New Experimental Data and Modeling with the Electrolyte Cubic Square-Well Equation of State Mazloumi, S.H.; Haghtalab, A.; Jalili, A.H.; Shokouhi, M.; Journal of Chemical & Engineering Data 2012, 57, 2625-2631