Amine-based post-combustion capture is considered an effective method to control CO emissions from industrial flue gases, but some improvements are still needed for its widespread use. Looking for low-corrosive sorbents for steel, we decided to investigate the properties of the tertiary amine 2-[2-(dimethylamino) ethoxy] ethanol (DMAEE), and in particular its CO equilibrium solubility at temperature in the range 298.15–323.15 K and CO partial pressure between 5.0 and 60 kPa. A correction factor based on the physical solubility was applied to modify the Kent-Eisenberg model and then to predict the CO solubility in DMAEE solution, and the absolute average deviation (AAD) between the prediction and the experimental data was found to be 3.0%, lower than that obtained by reported Kent-Eisenberg, Austgen, Hu-Chakma, and Li-Shen models. The proposed model was then further correlated with published solubility data of four other tertiary amines, and the results indicate that the proposed semi-empirical model can be used for these amines with acceptable AADs. In addition, the heat of CO absorption and the dissociation constant (pKa) were also systematically evaluated and compared with other reported amines, and the obtained results indicate that DMAEE has the potential to be a suitable absorbent for post-combustion CO capture.

中文翻译：

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用于关联和预测 2-[2-(二甲基氨基)乙氧基]乙醇水溶液中 CO2 平衡溶解度的改进半经验模型


基于胺的燃烧后捕集被认为是控制工业烟气二氧化碳排放的有效方法，但其广泛使用仍需要一些改进。为了寻找适用于钢铁的低腐蚀性吸附剂，我们决定研究叔胺 2-[2-(二甲基氨基)乙氧基]乙醇 (DMAEE) 的特性，特别是其在 298.15–323.15 K 温度范围内的 CO 平衡溶解度CO 分压在 5.0 至 60 kPa 之间。应用基于物理溶解度的修正因子修正Kent-Eisenberg模型，预测DMAEE溶液中CO的溶解度，预测结果与实验数据之间的绝对平均偏差(AAD)为3.0%，低于已报道的 Kent-Eisenberg、Austgen、Hu-Chakma 和 Li-Shen 模型获得的结果。然后将所提出的模型进一步与已发表的四种其他叔胺的溶解度数据相关联，结果表明所提出的半经验模型可用于具有可接受 AAD 的这些胺。此外，还系统地评估了CO吸收热和解离常数（pKa），并与其他报道的胺进行了比较，所得结果表明DMAEE有潜力成为燃烧后CO捕获的合适吸收剂。