Modeling CO{sub 2} and H{sub 2}S solubility in MDEA and DEA: Design implications
- Univ. of Texas, Austin, TX (United States)
The solubility of H{sub 2}S and CO{sub 2} in aqueous alkanolamines affects solution capacity and the required circulation rate for acid gas absorption. These thermodynamics also determine the relationship of steam rate and the lean loading of the solution which in turn sets the leak of acid gas from the top of the absorber. Finally, the mechanisms of mass transfer and the role of kinetics, especially in stripping, depend on the vapor/liquid equilibria. Published measurements of CO{sub 2} and H{sub 2}S solubility in methyldiethanolamine (MDEA) and diethanolamine (DEA) are not in general agreement, especially at low loading of acid gas. The available sets of solubility data have been regressed with the AspenPlus electrolyte/NRTL model. All of the parameters and constants that make up this model have been carefully evaluated. Independent thermodynamic data such as freezing point and heat of mixing have been included in the regression to strengthen the estimates of model parameters. The parameters for each set of solubility data have been evaluated in an attempt to determine which set is correct. Each evaluated model has been used to calculate the acid gas capacity and minimum stripping steam rate for several industrial cases of acid gas absorption/stripping.
- Sponsoring Organization:
- Gas Research Inst., Chicago, IL (United States)
- OSTI ID:
- 418181
- Report Number(s):
- CONF-960348-; TRN: IM9705%%559
- Resource Relation:
- Conference: 75. Annual convention of the Gas Processors Association, Denver, CO (United States), 11-13 Mar 1996; Other Information: PBD: 1996; Related Information: Is Part Of Seventy-fifth Gas Processors Association annual convention: Proceedings; PB: 325 p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
A model of vapor-liquid equilibria for acid gas-alkanolamine-water systems
Rigorous modeling of the acid gas heat of absorption in alkanolamine solutions