丙二醇甲醚與臭氧反應之探討

The study of reaction of propylene glycol methyl ether with ozone

沈育任(Yu-Ran Shan)

指導教授 ： 黃美利

義守大學/理工學院/化學工程學系暨生物技術與化學工程研究所/碩士(2018年)

摘要

本研究是利用臭氧高氧化力與ZSM-5沸石的吸附能力來降解丙二醇甲醚，探討丙二醇甲醚氧化後的中間產物及產物，以了解可能的反應機制。O3通入PGME樣品在不同時間後，IR圖上發現C=O振動吸收波峰，分析比對GC/MS圖譜推測產物為CO2、乙醛、甲酸甲酯、異丙醇、丙烯酸、丙二醇、乙酸甲酯及乳酸甲酯。臭氧與Air/PGME混合氣體通過30℃~50℃的沸石，顯示50℃沸石得到較佳降解率為58%。出口氣體冷凝液與沸石萃取液之FTIR光譜圖，顯示C=O伸縮振動吸收波峰有明顯的變化，再以GC/MS圖譜分析，偵測到新的產物為1-甲氧基乙醇。比對O3與PGME反應可能路徑之產物，推測臭氧會以氧原子或O3形式參與反應，先形成CH3CH(OH)CH(OH)OCH3，再形成CH(O)OCH3、CH3CH(O)、CH2C(OH)C(O)OH及CH3CH(OH)CH3，再進一步形成CH3CH(OH)CH2(OH)、CH3CH(OH)OCH3、CH3CH(O)OCH3及CH3OH，最後形成CH3CH(OH)C(O)OCH3。

關鍵字

丙二醇甲醚 ； 臭氧 ； 沸石

並列摘要

This research was applied the high oxidation of ozone and high absorption capacity of ZSM-5 zeolite to study the degradation of PGME. The identification of reaction intermediate and products were useful to understand the possible mechanism. There were new absorptions of C=O vibrational mode were observed after the ozone passed through PGME sample. Compared with GC/MS spectrum, suggested that the products included carbon dioxide, acetaldehyde, methyl formate, isopropyl alcohol, acrylic acid, propylene glycol, methyl acetate, and methyl lactate. Mixed gas of O3/air/PGME passed through 30 ℃~50 ℃ zeolite, indicated 50 ℃ zeolite would get better degradation (58%). The FTIR spectrum of condensed liquid of output gases and extracted liquid of zeolite shows apparent change of C=O stretching mode, accompanied with the analysis of GC/MS spectrum, newproductdetected was1-methoxyethanol. Compared with the products of possible reaction path, suggested that oxygen atom or ozone was involved in the reaction to form CH3CH(OH)CH(OH)OCH3first, then formed CH(O)OCH3, CH3CH(O), CH2C(OH)C(O)OH, CH3CH(OH)CH3, further formed CH3CH(OH)CH2(OH), CH3CH(OH)OCH3, CH3CH(O)OCH3 and CH3OH, and final product is methyl lactate.

並列關鍵字

PGME ； ozone ； zeolite

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