In this study, vapour-liquid equilibrium of CO₂-loaded aqueous potassium salt of L-histidine was studied for a wide range of temperature (313.15–353.15 K), pressure (150–4000 kPa), and solvent concentrations (1–2.5 molar). The experimental results show that L-histidine has an excellent absorptive capacity for carbon dioxide. When compared to conventional solvent (monoethanolamine) and amino acid salt (potassium L-lysinate) at similar process conditions, L-histidine has superior absorption capacity. Moreover, modified Kent–Eisenberg model was used to correlate the VLE of the studied system with excellent agreement between the model and experimental values. The model exhibited an AARE% of 7.87%, which shows that it can satisfactorily predict carbon dioxide solubilities in aqueous potassium salt of L-histidine at other process conditions. Being a biological component in origin, almost negligibly volatile, and highly resistant to oxidative degradation, L-histidine offers certain operational advantages over other solvents used and has a promising potential for carbon dioxide capture.

中文翻译：

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L-组氨酸溶液中负载二氧化碳的碳酸钾水溶液的VLE：捕获二氧化碳的绿色溶剂：实验数据和模型

在这项研究中，研究了在很宽的温度范围（313.15–353.15 K），压力（150–4000 kPa）和溶剂浓度（1–2.5）下，负载CO ₂的L-组氨酸钾盐水溶液的汽液平衡。磨牙）。实验结果表明，L-组氨酸对二氧化碳具有极好的吸收能力。当在相似的工艺条件下与常规溶剂（单乙醇胺）和氨基酸盐（L-赖氨酸钾）相比时，L-组氨酸具有优异的吸收能力。此外，使用改进的Kent-Eisenberg模型将研究系统的VLE与模型和实验值之间的出色一致性相关联。该模型的AARE％为7.87％，这表明它可以令人满意地预测在其他工艺条件下L-组氨酸的钾水溶液中的二氧化碳溶解度。L-组氨酸是起源的生物成分，几乎可以忽略不计，并且对氧化降解具有极高的抵抗力，与其他使用的溶剂相比，具有某些操作优势，并且具有捕获二氧化碳的潜力。