Modeling of H2S Solubility in aqueousN-methyldiethanolamine Solution Using Electrolyte SRK PlusAssociation Equation of State

Solubility of H2S in N-methyldiethanolamine (MDEA) aqueous solution at different solution compositions, temperatures, pressures and acid gas loadings was correlated using the electrolyte version of SRK plus association (eSRK- CPA) equation of state. MSA theory together with Born term are responsible for the electrolyte part of the model. 302 experimental data used in this work. To model ternary system, at first pure components parameters have obtained from literatures. Then binary subsystems investigated and binary interaction parameters calculated. In the following, ternary system modeled using a reactive bubble point pressure calculation method. The method consists of two mainparts; the first one calculated the liquid phase concentrations by solving reaction equilibria, mass and charge balance equations. Second part is responsible for calculation of bubble point pressure and vapor phase composition. Considering number of binary interaction parameters that should be optimized, three scenarios were proposed. All of the scenarios presents good results with acceptable Absolute AverageDeviation percentage (AAD%) but the third one show better outputs. The AAD% in this scenario is 17.02. The results show eSRK- CPA EoS good capability to calculate the solubility of H2S in aqueous MDEA solutions

Keywords:

H2S Solubility , Cubic Plus Association EoS , eSRK- CPA , CPA , Modeling , MDEA solution