二氧化碳吸收劑立體障礙醇胺 (AHPD) / 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 sterically hindered amines (AHPD) / Polyamine (DETA) Solutions

林建霖(Chien-Lin Lin)

指導教授 ： 李夢輝

中原大學/工學院/化學工程研究所/碩士(2018年)

https://doi.org/10.6840/cycu201800500

摘要

本研究的目的是要探討 CO_2 與 混合醇胺水溶液2-Amino-2-(hydroxymethyl)-1,3-propanediol（AHPD）+ Diethylenetriamine（DETA）的化學吸收反應動力學量測研究，同時測量該混合醇胺溶液在不同溫度下的密度、黏度、亨利常數以及擴散係數。雙成分系統濃度範圍為 AHPD（25～40 wt%）＋ H_2 O；三成分系統濃度範圍為 AHPD（25 wt%）＋ DETA（15 wt%）＋ H_2 O、AHPD（30 wt%）＋ DETA（10 wt%）＋ H_2 O 及AHPD（35 wt%）＋ DETA（5 wt%）＋ H_2 O，密度及黏度的溫度範圍為30～70℃；亨利常數及擴散係數的溫度範圍為30～40℃。
本實驗的研究結果由化學反應方程式代表，AHPD與CO_2的化學反應和DETA與CO_2反應是以兩性離子反應機構表示，由此兩者的量測數據以數值迴歸得到反應速率常數，隨著混合醇胺溶液中AHPD濃度增加，化學反應速率隨之降低；DETA物理溶解度雖然不佳，但增加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中，亨利常數、擴散係數與反應速率常數是程序設計必須參考的重要數據，本研究可提供AHPD + DETA溶液吸收酸性氣體在設計反應器上所需要的動力學相關數據。

關鍵字

二氧化碳吸收劑 ； 立體障礙醇胺 ； 多元胺

並列摘要

The objective of this research is to determine the reaction kinetics of the CO_2 into aqueous solutions of 2-Amino-2-(hydroxymethyl)-1,3-propanediol（AHPD）and into mixed amine solutions of AHPD and DETA. The system studied were : AHPD（25, 30, 35, 40 wt%）＋ H_2 O and AHPD（25 wt%）＋ DETA（15 wt%）＋ H_2 O, AHPD（30 wt%）＋ DETA（10 wt%）＋ H_2 O , AHPD（35 wt%）＋ DETA（5 wt%）＋ H_2 O. The physical properties such as density, viscosity, Henry’s law constant and diffusivity of the system were also be measured. Due to the chemical reaction of CO_2 with the amine solutions, the N_2 O analogy was used to estimate the chemical solubility and chemical diffusivity of CO_2 into aqueous amine solutions.
The reaction rate of constants were calculated by a hybrid model which combines the pseudo-first order reaction mechanism for the reaction of CO_2 with AHPD and the zwitterion mechanism for the absorption of CO_2 into DETA.
The results of this research can be used to design the CO_2 absorption process of CO_2 absorbent ( AHPD ＋ DETA ).

並列關鍵字

Carbon Dioxide ； sterically hindered amines ； Polyamine

參考文獻

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