PZ/MDEA/H2O 吸收二氧化碳之反應動力學 數據量測研究

Measurement of the Reaction Kinetics of CO2 with aqueous PZ / MDEA solutions

姚威良(Wei-Liang Yao)

指導教授 ： 李夢輝

中原大學/工學院/化學工程研究所/碩士(2002年)

https://doi.org/10.6840/cycu200200215

摘要

摘要
本研究主要利用濕壁柱來量測並探討CO2與PZ / MDEA水溶液的反應動力學，其濃度範圍為PZ (0.1-0.4 kmol·m-3) / MDEA (1.0 kmol·m-3)及PZ (0.1-0.4 kmol·m-3) / MDEA (1.5 kmol·m-3)，溫度是30、35及40°C。
對於CO2，本研究以pseudo-first-order的模式來描述反應動力行為，而對於PZ以及MDEA對二氧化碳的反應則以一級反應機構來描述。一些在計算中所需的物理數據如：密度、黏度、亨利常數及擴散係數，我們也一併加以量測。而亨利常數與擴散係數以N2O類比方法來加以量測。透過這次的實驗能測量到PZ正確的反應動力學數據。
結果發現添加少量的PZ能有效的提高二氧化碳的吸收效率，因此本實驗的數據可以作為二氧化碳吸收的基礎數據。

關鍵字

貳次乙亞胺 ； 二氧化碳 ； 反應動力學

並列摘要

Abstract
This object of research is to measure the reaction kinetics data for the reaction between CO2 and Piperazine (PZ) + Methyldiethanolamine (MDEA) solutions. The systems to be studied are：PZ (0.1-0.4 kmol·m-3) / MDEA (1.0 kmol·m-3) and PZ (0.1-0.4 kmol·m-3) / MDEA (1.5 kmol·m-3). The temperature will range from 30 to 40℃. The specific CO2 absorption rate were measured by a wetted-wall column apparatus. The physicochemical properties such as density, viscosity, Henry’s law constant and diffusivity of nitrous oxide in amines were also measured.
A first order reaction rate for CO2-PZ and CO2-MDEA reactions was used to model the CO2 absorption into PZ/MDEA/H2O. The model is satisfactory to represent CO2 absorption rates in aqueous PZ/ MDEA/H2O system.

並列關鍵字

MDEA ； CO2 absorption ； PZ

參考文獻

Al-Ghawas, H. A.; Hagewiesche, D. P.; Ruiz-Ibanez, G.; Sandall, O. C. Physichemical Properties Important for Carbon Dioxide Absorption in Aqueous Methyldi-ethanolamine. J. Chem. Eng. Data 1989, 34, 385-391.

Alvarez-Fuster, C.; Midoux, N.; Laurent, A.; Charpentier, J. C. Chemical Kinetics of the Reaction of Carbon Dioxide with Amine in Pseudo m-nth Order Condition in Aqueous and Organic Solutions. Chem. Eng. Sci. 1980, 35, 1717-1723.

Astarita, G.; Savage, D. W.; Longo, J. M. Promotion of CO2 Mass Transfer in Carbonate Solutions. Chem. Eng. Sci. 1981, 36, 581-588.

Barth, D.; Tondre, C.; Delpuech, J.-J. Kinetics and Mechanisms of the Reactions of Carbon Dioxide with Alkanolamines: A Discussion Concerning the Cases of MDEA and DEA. Chem. Eng. Sci. 1984, 39, 1753-1757.

Blauwhoff, P. M. M.; Versteeg, G. F.; van Swaaij, W. P. M. A Study on the Reaction between CO2 and Alkanolamines in Aqueous Solutions. Chem. Eng. Sci. 1983, 38, 1411-1429.