In this study, two thermodynamic approaches, namely explicit model and modified Kent-Eisenberg model are presented for the accurate determination of carbon dioxide solubility in aqueous solutions of amino acid salts with different levels of complexity. Both models were further extended to the correlation of carbon dioxide solubility in aqueous blends of amino acid salts with alkanolamines. Firstly, the explicit model consists of a single mathematical equation. Its structure is computationally simple and derived from equilibrium thermodynamics theory. Secondly, the modified Kent-Eisenberg model utilizes detailed reaction mechanism for development of a polynomial equation, that is solved by combining all non-idealities in two correction factors. Both models suitably determined the thermodynamics of carbon dioxide loaded aqueous amino acid salt solutions and their blends with alkanolamines. The results were in good agreement with experimental data for representative amino acid salt solutions (potassium and/or sodium salts of lysine, glycine, proline, sarcosine, serine, threonine, alanine, phenylalanine, amino-butyric acid, glutamine and asparagine) and their blends with alkanolamines (2-amino-2-methyl-1-propanol and piperazine) for range of process parameters. For carbon dioxide solubility in aqueous amino acid salt solutions, the AARE% for explicit and modified Kent-Eisenberg model was 13.85% and 13.84%, respectively. For carbon dioxide solubility in aqueous blends of amino acid salt and alkanolamine solutions, the AARE% for explicit and modified Kent-Eisenberg model was 18.25% and 17.25%, respectively. Both models use a small number of adjustable parameters. This indicates that generated parameters are able to accurately predict the carbon dioxide solubility at other process conditions, with minimum computational intricacy.

在这项研究中，提出了两种热力学方法，即显式模型和改进的Kent-Eisenberg模型，用于精确测定具有不同复杂程度的氨基酸盐水溶液中的二氧化碳溶解度。两种模型都进一步扩展到了二氧化碳在氨基酸盐与链烷醇胺的水性混合物中的溶解度的相关性。首先，显式模型由一个数学方程式组成。它的结构在计算上很简单，并且是从平衡热力学理论推导而来的。其次，改进的Kent-Eisenberg模型利用详细的反应机理来开发多项式方程，该方程是通过将所有非理想性结合在两个校正因子中来解决的。两种模型均能确定载有二氧化碳的氨基酸盐水溶液及其与链烷醇胺的混合物的热力学。结果与代表性氨基酸盐溶液（赖氨酸，甘氨酸，脯氨酸，肌氨酸，丝氨酸，苏氨酸，丙氨酸，苯丙氨酸，氨基丁酸，谷氨酰胺和天冬酰胺的钾盐和/或钠盐）的实验数据吻合良好。与链烷醇胺（2-氨基-2-甲基-1-丙醇和哌嗪）共混，以获得一系列工艺参数。对于二氧化碳在氨基酸盐水溶液中的溶解度，显式和改进的Kent-Eisenberg模型的AARE％分别为13.85％和13.84％。对于二氧化碳在氨基酸盐和链烷醇胺溶液的水性混合物中的溶解度，显式和改进的Kent-Eisenberg模型的AARE％为18.25％和17。分别为25％。两种型号都使用少量的可调参数。这表明生成的参数能够以最小的计算复杂度准确预测其他工艺条件下的二氧化碳溶解度。