The Amine Package (AMINE) may be used to model the removal of H2S and CO2 from natural gas feeds using aqueous amine systems. Amines included in the package are primary amines MEA and DGA, secondary amines DEA and DIPA, and the tertiary amine MDEA. A separate model is supplied for each amine. A single amine and water should be included in the component slate. Including more than one amine is discouraged.
The acid-base equilibrium reactions are written as chemical dissociations following the approach of Kent and Eisenberg. The chemical equilibrium constants for the dissociation reactions are represented by polynomials in temperature.
The liquid enthalpy is calculated by adding a correction for the heat of reaction to the enthalpy calculated by the Ideal method. The vapor phase enthalpy, entropy and density are computed with the SRKM method. The liquid phase density is computed by the IDEAL method.
For MEA and DEA systems, data have been regressed from a large number of sources, resulting in good prediction of phase equilibria for these systems. The data for DIPA systems were very limited and the results cannot be expected to be good enough for design. For DGA and MDEA you may supply a dimensionless residence time factor, to more closely match the CO2 slippage with these amines. Predictions for MDEA are not accurate enough for design.
See "Amine Package (AMINE)" under "Special Packages" in Chapter 2, Volume 1, of the PRO/II Reference Manual for more information.
Application Guidelines
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