二氧化碳吸收劑立體障礙醇胺 (AEPD) / 多元胺 (DETA) 水溶液之反應動力學量測研究

Reaction Kinetics of the Carbon Dioxide in the Aqueous sterically hindered amines (AEPD) / Polyamine (DETA) Solutions

張恭岳(KUNG-YUEH CHANG)

指導教授 ： 李夢輝

中原大學/工學院/化學工程學系/碩士(2022年)

https://doi.org/10.6840/cycu202201486

摘要

本研究探討CO2與立體障礙醇胺2-amino-2-ethyl-1,3-propanediol (AEPD) /多元胺Diethylenetriamine (DETA) 水溶液的化學吸收反應動力學研究。本實驗使用濕壁柱量測CO2的化學吸收，也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。雙成分系統是AEPD醇胺水溶液(5, 10, 15, 20, 25, 30 wt %)；三成分混和醇胺水溶液系統為AEPD (25 wt %) + DETA (15 wt %) + H2O、AEPD (30 wt %) + DETA (10 wt %) + H2O及AEPD (35 wt %) + DETA (5 wt %) + H2O；量測壓力皆為常壓，密度的溫度範圍是20 ~ 70 C，黏度的溫度範圍是25 ~ 45 C，亨利常數與擴散係數的溫度範圍則是30、35和40 C。在研究中AEPD或DETA與CO2的化學反應方程式是以兩性離子反應機構模式，並且使用擬一級反應模式，由此兩者的量測數據用數值迴歸求得反應速率常數。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基礎數據，本研究可提供用(AEPD + DETA)水溶液吸收酸性氣體之反應器設計時所需的熱物性質及動力學數據計算的依據。

關鍵字

二氧化碳 ； 立體障礙醇胺 ； 反應動力學

並列摘要

The objective of this study is to investigate reaction kinetics of the CO_2 into aqueous blended amine solution contains 2-amino-2-ethyl-1,3-propanediol (AEPD) / Diethylenetriamine (DETA). The wetted wall column is applied to measure the reactions kinetics of the CO_2 with the blend amine systems. The physical properties density, viscosity, Henry’s law constant and diffusivity of the systems were also be measured. The binary system is: AEPD(5, 10, 15, 20, 25, 30 wt %) ＋ H_2 O , and the ternary system is AEPD(25 wt %) ＋ DETA(15 wt %) ＋ H_2 O, AEPD(30 wt %) ＋ DETA(10 wt %) ＋ H_2 O , AEPD(35 wt %) ＋ DETA(5 wt %) ＋ H_2 O. All measurements are at atmosphere pressure. Density of the systems is measured from 20 C to 70 C. Viscosity is measure from 25 C to 45 C. Henry’s law constant and diffusivity is measured from 30 C to 40 C. The reaction rate of constants is represented by a hybrid model which combines the pseudo-first order reaction mechanism and the zwitterion mechanism. The results of this research can be used to design the CO_2 absorption process of CO_2 using aqueous absorbent (AEPD ＋ DETA).

並列關鍵字

Carbon Dioxide ； Sterically Hindered Amines ； Reaction Kinetics

參考文獻

Abu-Arabi, M. K., Al-Jarrah, A. M., El-Eideh, M., & Tamimi, A. (2001). Physical Solubility and Diffusivity of CO2 in Aqueous Diethanolamine Solutions. J. Chem. Eng. Data, 46, 516-521.

Al-Ghawas, H. A., Hagewlesche, D. P., Ruiz-Ibanez, G., & Sandall, O. C. (1989). Physicochemical properties important for carbon dioxide absorption in aqueous methyldiethanolamine. J. Chem. Eng. Data, 34, 385-391.

Alper, E., & Bouhamra, W. (1994). Reaction-Kinetics of Carbonyl Sulfide with Aqueous Ethylenediamine and Diethylenetriamine. Gas Separation & Purification, 8(4), 237-240.

Alvarezfuster, C., Midoux, N., Laurent, A., & Charpentier, J. C. (1981). Chemical-Kinetics of the Reaction of CO2 with Amines in Pseudo M-Nth Order Conditions in Polar and Viscous Organic Solutions. Chem. Eng. Sci., 36(9), 1513-1518.

Astarita, G., Savage, D. W., & Bisio, A. (1983). Gas Treating with Chemical Solvents. New York: John Wiley.