二氧化碳吸收劑三級醇胺 (1DMAP)/多元胺(DETA) 水溶液之反應動力學量測研究

The Reaction Kinetics of the Carbon Dioxide in the Aqueous Tertiary Amine (1DMAP) / Polyamine (DETA) Solutions

邱聖皓(Sheng-Hao Chiu)

指導教授 ： 李夢輝

中原大學/工學院/化學工程研究所/碩士(2016年)

https://doi.org/10.6840/cycu201600264

摘要

本研究主要探討CO2與三級醇胺1-Dimethylamino-2-propanol (1DMAP) 混合多元醇胺Diethylenetriamine (DETA)水溶液的化學吸收反應動力學研究，實驗裝置為使用濕壁柱來量測CO2化學吸收，同時量測醇胺水溶液在不同溫度下的密度、黏度、亨利常數和擴散係數，雙成分系統濃度範圍是1DMAP (5, 10, 15, 20, 25 和 30 wt%) 水溶液；三成分系統為1DMAP (25wt%) + DETA (5wt%) + H2O、1DMAP (20wt%) + DETA (10wt%) + H2O及1DMAP (15wt%) + DETA (15wt%) + H2O，溫度是30、35和40C。研究中1DMAP與CO2的化學反應以擬一級反應表示，DETA與CO2反應是以兩性離子反應機構表示，可由此兩者的量測數據以數值迴歸得到反應速率常數。
實驗結果發現在混合溶劑中1DMAP有助於增加物理溶解度，但隨著混合溶劑中1DMAP濃度增加，化學反應速率卻相對降低，DETA物理溶解度不佳，隨著增加DETA濃度卻能有效提升化學反應速率。
在酸性氣體吸收的化工程序設計上，亨利常數、擴散係數與反應速率常數是設計程序必須參考的重要數據，本研究可提供1DMAP + DETA水溶液吸收酸性氣體上設計反應器時所需動力學數據的計算的依據。

關鍵字

二氧化碳吸收劑 ； 三級醇胺 ； 多元胺 ； 反應動力學量測研究

並列摘要

The reaction kinetics of the CO2 absorption into aqueous solutions of 1-Dimethylamino-2-propanol (1DMAP) and Diethylenetriamine (DETA) were investigated by a wetted wall column at 30, 35, and 40oC. The systems studied were: binary systems, 1DMAP (5, 10, 15, 20, 25 and 30 wt%) + H2O; ternary systems, 1DMAP(25%) + DETA(5%) + H2O, 1DMAP(20%) + DETA(10%) + H2O, 1DMAP(15%) +DETA(15%) + H2O. The physical properties such as density, viscosity, Henry’s law constant and diffusivity of the studied systems were also measured. Due to the reactivity of CO2 with the amine solutions, the N2O analogy was used to estimate the solubility and diffusivity of CO2 in the aqueous amine solutions. The pseudo-first order reaction mechanism was applied for the reaction of CO2 with 1DMAP while the zwitterion mechanism was used for the absorption of CO2 into DETA. The reaction rate constants were determined from the measured specific absorption rate data. Results show that the can accelerate the absorption rate in aqueous 1DMAP + DETA solutions. The results of this study can be used as a process design data for the CO2 absorption process of which the aqueous 1DMAP + DETA solutions was used as the CO2 absorbents.

並列關鍵字

Kinetics of the Carbon Dioxide ； 1-Dimethylamino-2-propanol ； Diethylenetriamine

參考文獻

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