Modeling solubility of acid gases in alkanolamines using the nonelectrolyte Wilson-nonrandom factor model

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• 作者：Ali Haghtalab ; Abolfazl Shojaeian
• 关键词：Excess Gibbs function ; Solubility ; Acid gases ; Alkanolamine ; N-Wilson-NRF
• 刊名：Fluid Phase Equilibria
• 出版年：2010
• 出版时间：25 February 2010
• 年：2010
• 卷：289
• 期：1
• 页码：6-14
• 全文大小：958 K

文摘

The nonelectrolyte Wilson-nonrandom factor local composition model (N-Wilson-NRF) by Haghtalab and Mazloumi is applied for modeling the vapor–liquid equilibrium of the acid gases (CO₂ and H₂S)–alkanolamine–water systems. The model is used to calculate the nonideality of species in liquid phase through the activity coefficient equations. In this work, we use the N-Wilson-NRF model for short-range forces in the aqueous electrolyte system of alkanolamines by using the concept of ion-pair. For the long-range interaction the Pitzer–Debye–Hückel theory is applied. The model is used to correlation of the solubility data of CO₂ and H₂S in aqueous monoethanolamine (MEA), diethanolamine (DEA), methyldiethanolamine (MDEA) and 2-amino-2methyl-1-propanol (AMP) systems over wide range of temperature (0–140 °C), partial pressure (0.001–1000 kPa) and acid gases loading (0.001–1.0 mol gas/mol amine). To show the predictability of the model, the interaction parameters without any additional adjustable parameters are used to predict the solubility of CO₂ in aqueous AMP solution at different conditions. The results of the model show a very good agreement with the experimental data.