In this work, novel non-aqueous absorbents composed of 2-ethylhexan-1-amine (EHA) and glyme were proposed for CO₂ capture. The absorption performance of CO₂ in EHA + diglyme, EHA + triglyme and EHA + tetraglyme non-aqueous solutions was investigated and the viscosities (η) of the CO₂-saturated absorbents were measured. Besides the experiments, kinetic models were applied to correlate the CO₂ absorption. The activation energy (E_a) was obtained from Arrhenius equation, and the absorption mechanism was deduced. The results showed that both Lagergren model and Avrami model can accurately correlate and predict the time-dependent absorption amount, thus an optimized composition under which excellent absorption performance and relatively low η and E_a can be simultaneously achieved was determined. Compared to water-based absorbents like MEA, the optimized non-aqueous absorbents take the advantages of better absorption performance and lower activation energy. Moreover, the glyme solvents have about 50% lower specific heat capacities and much higher boiling points (≥435 K) than water, which is expected to greatly reduce the sensible heat and the latent heat of the solvent during regeneration. Therefore, the proposed novel absorbents have promising industrial application potential in the CO₂ capture process.

在这项工作中，提出了由2-乙基己-1-胺（EHA）和甘醇二甲醚组成的新型非水吸收剂，用于CO ₂捕集。研究了CO ₂在EHA +二甘醇二甲醚，EHA +三甘醇二甲醚和EHA +四甘醇二甲醚非水溶液中的吸收性能，并测量了CO ₂饱和吸收剂的粘度（η）。除实验外，还应用动力学模型来关联CO ₂吸收。活化能（E _a从Arrhenius方程获得，并推导吸收机理。结果表明，Lagergren模型和Avrami模型都可以准确地关联和预测随时间变化的吸收量，从而获得了优化的组成，在该结构下，吸收性能优异，η和E _a较低可以同时实现被确定。与MEA等水基吸收剂相比，经过优化的非水吸收剂具有更好的吸收性能和更低的活化能。而且，甘醇二甲醚溶剂的比热容量比水低约50％，沸点（≥435K）高得多，这有望大大降低再生过程中溶剂的显热和潜热。因此，提出的新型吸收剂在CO ₂捕集过程中具有广阔的工业应用潜力。