Abstract Salts of the basic amino acid l -arginine are potential co-promoters and blending components for the conventional solvents used in carbon dioxide-based separations. This study defines the contribution of arginine salts to equilibrium carbon dioxide absorption at co-promoter concentrations (less than 1 M) and high pressure. Experimentally determined carbon dioxide loadings in aqueous potassium and sodium salt solutions of l -arginine show a positive relationship with pressure (range: 110–4110 kPa); but a negative behaviour with an increase in temperature (range: 303.15–363.15K) and solvents concentrations (range: 0.25–0.75 M). The experimental results are correlated by the Kent-Eisenberg and the explicit models, with an average absolute deviation of 10.72% and 5.03%, respectively. The regressed parameters of both models allow satisfactory estimation of the carbon dioxide loadings in arginine salt solutions at other process conditions. Comparison with piperazine and monoethanolamine shows that l -arginine salts have a better carbon dioxide absorption capacity at high pressure.

中文翻译：

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L-精氨酸水溶液对高压下共促进剂作用中平衡二氧化碳吸收的贡献

摘要 碱性氨基酸 l-精氨酸的盐是基于二氧化碳的分离中使用的常规溶剂的潜在共促进剂和混合组分。该研究确定了在共促进剂浓度（小于 1 M）和高压下精氨酸盐对平衡二氧化碳吸收的贡献。实验确定的 L-精氨酸钾和钠盐水溶液中的二氧化碳负载量与压力呈正相关（范围：110–4110 kPa）；但随着温度（范围：303.15–363.15K）和溶剂浓度（范围：0.25–0.75 M）的增加而出现负面行为。实验结果与 Kent-Eisenberg 和显式模型相关，平均绝对偏差分别为 10.72% 和 5.03%。两种模型的回归参数都可以令人满意地估计其他工艺条件下精氨酸盐溶液中的二氧化碳负荷。与哌嗪和单乙醇胺相比，L-精氨酸盐在高压下具有更好的二氧化碳吸收能力。