The main objective of this research is to improve the CO₂ solubility and absorption rate of conventional alkanolamines including monoethanolamine (MEA) and methyldiethanolamine (MDEA) by 1,4–diaminobutane (DAB) as a promoter. Typically, the presence of two primary functional groups, lack of strict hindrance, and low molecular weight make DAB an efficient solvent to absorb CO₂. In the first step, the absorption kinetic of DAB is investigated theoretically and a rate equation is proposed based on the zwitterion mechanism. In the second step, the equilibrium capacity of MEA and MDEA is promoted by DAB experiment in an isothermal stirred batch reactor in the pressure range 20–100 kPa, temperature range 303–313 K, and promoter volume fraction 0–10%. Then, the effective loading and regenerability of prepared samples are investigated by continuous cyclic absorption and regeneration in the designed reactor. The experimental results show that increasing DAB concentration in the MEA and MDEA as base solutions increases the CO₂ absorption rate and equilibrium capacity. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.

中文翻译：

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CO2在单乙醇胺，甲基二乙醇胺和二氨基丁烷的二元水性混合物中的溶解度

这项研究的主要目的是通过1,4-二氨基丁烷（DAB）作为促进剂来提高常规链烷醇胺（包括单乙醇胺（MEA）和甲基二乙醇胺（MDEA））的CO ₂溶解度和吸收率。通常，两个主要官能团的存在，没有严格的阻碍和低分子量使DAB成为吸收CO ₂的有效溶剂。第一步，理论上研究了DAB的吸收动力学，并基于两性离子机理提出了速率方程。第二步，在等温搅拌间歇反应器中，压力范围为20-100 kPa，温度范围为303-313 K，促进剂体积分数为0-10％，通过DAB实验可提高MEA和MDEA的平衡容量。然后，通过在设计的反应器中进行连续的循环吸收和再生，研究了制备样品的有效负载量和可再生性。实验结果表明，作为碱溶液，MEA和MDEA中DAB浓度的增加会增加CO _2的吸收速率和平衡能力。©2020年化学工业协会和John Wiley＆Sons，Ltd.