新穎二氧化碳回收固定技術開發及封存技術評估─子計畫二：新穎二氧化碳吸收劑配方開發—吸收二氧化碳之反應動力及熱物性質量測及評估研究

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Title:	新穎二氧化碳回收固定技術開發及封存技術評估─子計畫二：新穎二氧化碳吸收劑配方開發—吸收二氧化碳之反應動力及熱物性質量測及評估研究
Authors:	江鴻龍(Hung-Lung Chiang);(李夢輝)
Contributors:	公共衛生學院風險管理學系
Keywords:	二氧化碳;二胺基二甲基丙醇;對二氮已環;摻合醇胺水溶液;酸性氣體吸收;反應動力學;Carbon dioxide;2-Amino-2-methyl-1-propanol;Piperazine;Blended-amine solutions;Acid gas absorption;Reaction kinetics
Date:	2006-12-31
Issue Date:	2009-09-01 14:53:50 (UTC+8)
Abstract:	本研究為探討摻和醇胺二胺基二甲基丙醇 (AMP)/對二氮已環(PZ)水溶液吸收二氧化碳之熱物性質及反應動力學數據量測研究。所探討之系統為2.0及3.0 kmol/m3之AMP 水溶液系統中分別加入0.1, 0.2, 0.3及0.4 kmol/m3 之PZ，以評估AMP 水溶液系統中加入促進劑PZ，對於捕捉二氧化碳之吸收速率影響。溫度範圍為30, 35及40℃。所量測之吸收反應動力學數據將由反應動力學由二氧化碳擬一級反應結合AMP 複合離子模式來表示，以模擬統定二氧化碳與醇胺AMP/PZ之反應速率常數。本計畫之主要工作項目為(1) PZ/H2O及PZ/AMP/H2O 之吸收二氧化碳熱物性質量測，包括密度、黏度、亨利常數(N2O)及擴散係數(N2O)量測，(2) PZ/H2O 及PZ/AMP/H2O之吸收二氧化碳之反應動力學數據量測，主要為二氧化碳之比吸收速率量測，(3)由所量測之熱物性質及反應動力學數據推出二氧化碳與醇胺AMP/PZ之反應機構及反應速率常數，(4)離子液體吸收二氧化碳之熱物性質，包括密度、黏度及二氧化碳之平衡溶解度。本計畫之工作已依原訂進度順利進行，醇胺之熱物性質及反應動力學已如期完成，離子熔液在常壓下之密度、黏度也完成，二氧化碳在離子液體之平衡溶解度由微量天平來量測，微量天平配合中原大學薄膜中心擴建完成己于十二月初(95/12)架設裝置及試車，有初步之量測結果。二氧化碳與醇胺水溶液之比吸收速率由短溼壁柱來測量，醇胺水溶液之物性數據，如密度、黏度以及氧化亞氮在混合醇胺水溶液之亨利常數、擴散係數等也同時量測，而二氧化碳在混合醇胺水溶液之亨利常數、擴散係數將由氧化亞氮相似定律估算。所量測之吸收反應動力學數據由擬一級反應結合AMP 複合離子模式來表示，以模擬統定二氧化碳與醇胺AMP/PZ之反應速率常數，所得之二氧化碳與醇胺PZ、AMP之反應速率常數將適用於CO2/AMP /H2O、CO2/PZ/H2O、CO2/ AMP/PZ/H2O，此模式應可完整描述摻和醇胺及單一醇胺水溶液吸收二氧化碳之反應機構。本研究之成果可提供CO2/AMP/PZ/H2O 之反應動力學基礎數據及相關之反應速率常數等，可作為設計吸收設備之依據。 The objective of this research was to study both experimentally and theoretically the absorption of carbon dioxide into aqueous blends of 2-Amino-2-methyl-1-propanol (AMP) and piperazine (PZ). The PZ with concentrations of 0.1, 0.2, 0.3, and 0.4 kmol m-3 were blended into 2.0 and 3.0 kmol m-3 aqueous AMP solutions. The temperature ranges from 30 to 40 oC. The experimental reaction kinetics data were represented by a pseudo-first order reaction mechanism incorporated with the zwitterion mechanism for CO2-AMP reaction mechanism to obtain the reaction rate constants of carbon dioxide with AMP and PZ. The experimental measurements were: density, viscosity of PZ/H2O and PZ/AMP/H2O and Henry's constant and diffusivity of N2O in PZ/H2O and PZ/AMP/H2O, also the reaction kinetic data of CO2 reaction with PZ/H2O and PZ/AMP/H2O. The experimental measurements have been completed as planned. Also for the ionic liquids, physical properties such as density and viscosity of ionic liquids have been measured. The equilibrium solubility of CO2 in ionic liquids was measured using the microbalance. Due to the completion of the expansion construction of the membrane technology center in Chung Yuan Christian University, the microbalance has been setup and test run in the beginning of December (12/2006), the preliminary results of the measurement were presented in this report. The specific CO2 absorption rate will be measured using 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. The N2O analogy was used to estimate the Henry's law constant and diffusivity of CO2 in amines solutions. The kinetics data of CO2/ AMP/PZ/H2O were used to determine the reaction rate constants for CO2/AMP, CO2/PZ. The determined reaction rate constants were consistent for single amines and blend amine systems. The results of this study can provide the fundamental kinetics data for the process design for the CO2 absorption using aqueous PZ/AMP solutions as absorbents.
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