The “coordinative effect” was discovered in MEA + DEA bi-solvents already, and it enhances both CO₂ absorption and desorption within MEA + RR'NH simultaneously. A recent study verified strong coordinative effects within MEA + BEA (RR'NH) + AMP tri-solvents, but whether the coordination was 100% attributed to interaction of MEA + BEA needs to be confirmed. This study investigated the “coordinative effect” separately within MEA + AMP (hindered amine) and MEA + BEA (RR'NH). The CO₂ absorption and desorption processes were performed onto MEA + AMP and MEA + BEA (0.1 + 2–0.5 + 2 mol/L) separately. The CO₂ absorption–desorption parameters were calculated to evaluate the coordinative effects on a consistent level. Results indicated negligible “coordinative effect” within MEA + AMP but strong coordination within MEA + BEA. Both CO₂ absorption and desorption performance of MEA + BEA (0.2 + 2 mol/L) was better than 2.0 mol/L BEA simultaneously. The coordinative effect was optimum within MEA + BEA bi-solvents at 0.2 + 2 mol/L close to 0.3 + 2 + 2 mol/L of MEA + BEA + AMP tri-solvents. Based on analysis, carbamate stability and pK_a were two main factors that determine negligible–strong coordinative effects between AMP and BEA; different pK_a reflected the optimized blending ratios of MEA + DEA (3/7) and MEA + BEA (2/20).

中文翻译：

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通过吸收-解吸参数分析研究 0.1 + 2–0.5 + 2 mol/L 双混合胺 MEA + AMP 和 MEA + BEA 中的“协调效应”

已经在MEA + DEA 双溶剂中发现了“协同效应”，它同时增强了MEA + RR'NH 中的CO ₂吸收和解吸。最近的一项研究证实了 MEA + BEA (RR'NH) + AMP 三溶剂中的强协调作用，但协调是否 100% 归因于 MEA + BEA 的相互作用需要确认。本研究分别研究了 MEA + AMP（受阻胺）和 MEA + BEA (RR'NH) 中的“协调效应”。CO ₂吸收和解吸过程分别在 MEA + AMP 和 MEA + BEA (0.1 + 2–0.5 + 2 mol/L) 上进行。二氧化碳₂计算吸收-解吸参数以在一致水平上评估协同效应。结果表明 MEA + AMP 内的“协调效应”可以忽略不计，但 MEA + BEA 内的协调性很强。同时，MEA+BEA(0.2+2mol/L)的CO ₂吸收和解吸性能均优于2.0 mol/L BEA。在 0.2 + 2 mol/L 的 MEA + BEA 双溶剂中，配合效果最佳，接近 0.3 + 2 + 2 mol/L 的 MEA + BEA + AMP 三溶剂。根据分析，氨基甲酸酯稳定性和 pK _a是决定 AMP 和 BEA 之间可忽略的强协调作用的两个主要因素；不同的pK _a反映了MEA + DEA (3/7) 和MEA + BEA (2/20) 的优化混合比。