非熱電漿結合吸附劑脫附異丙醇效能探討

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蕭辰翰(Chen-han Hsiao) 查詢紙本館藏

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環境工程研究所

論文名稱

非熱電漿結合吸附劑脫附異丙醇效能探討
(Desorption of IPA from Bead-Shaped Activated Carbon via Nonthermal Plasma)

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摘要(中)

異丙醇為揮發性有機污染物之一，近年來成為高科技產業清洗製程中，主要使用之溶劑。就揮發性有機污染物控制技術中，利用吸附劑來處理揮發性有機物，是常見且經濟可行之方法，將空氣污染物吸附於吸附劑上，乾淨的氣體則排放至大氣中，其吸附劑脫附再生可利用變溫或變壓的程序。熱脫附程序中為了產生高溫的氣體或蒸汽，需要額外的能量消耗，且升溫或降溫時間長；變壓程序則是利用真空泵浦維持低壓狀態，使污染物脫附，相對的也需要增加能量的消耗與操作成本。而利用非熱電漿(Non-thermal plasma)產生高能量的電子與激發分子撞擊吸附劑中污染分子，使污染物分子脫離吸附劑達脫附之目的，且非熱電漿可操作於室溫與常壓下，快速啟動且無需維持高溫等優點，是一項新穎的技術。本研究使用顆粒狀活性碳吸附異丙醇，以不同脫附氣體於非熱電漿進行脫附效能之探討，脫附氣體分別使用氮氣、空氣與氧氣。結果顯示，氮氣為脫附氣體時，異丙醇脫附濃度降為零的時間最長為85分鐘，其依序為空氣的50分鐘與氧氣35分鐘。異丙醇脫附效率方面，氮氣為脫附氣體時最高，異丙醇脫附效率達82.14%，最低則為氧氣34.34%，於相同脫附時間15及30鐘時間下，異丙醇脫附效率仍以氮氣為脫附氣體時最高(37.18 %及57.88 %)。副產物方面，空氣與氧氣為脫附氣體時均有生成丙酮與CO2，氧氣則有CO生成，氮氣並無觀察到副產物生成，主要以異丙醇為主。脫附氣體流率增加異丙醇脫附效率提升5.1~8.4%，副產物選擇性下降。經重覆吸/脫附實驗後吸附劑BET比表面積下降平均孔洞尺寸上升，表面含氧官能基數量則增加，使用氮氣為脫附氣體，吸附劑表面積、平均孔徑及官能基變化最小。

摘要(英)

How to effectively reduce volatile organic compound (VOC) emission into atmosphere has become an important environmental issue. Adsorption is commonly used as a control technique for reducing VOC emissions. Activated carbon and molecular sieve are generally used as absorbent materials which can be regenerated by desorption process either via temperature swing or pressure swing. However, these processes require additional energy for creating high temperature gas or low-pressure condition needed for desorption. A novel technique applying nonthermal plasma for effective desorption of VOCs from the absorbent materials by high energy electron impacts and excited molecules interaction is developed. This study evaluates the effectiveness of nonthermal plasma as a tool for the desorption of IPA from the bead-shaped activated carbon. The experimental results indicate that the IPA desorption efficiency obtained by different background gas are in the order as：N2 (82.14%) > AIR (47.05%) > O2 (34.34%), the products detected after plasma desorption include CO2, CO, and acetone when air or oxygen is used. The IPA desorption efficiency increases by approximately 5.1~8.4 % as the background gas flow rate is increased from 1000 to 2000 sccm. The BET surface area of bead-shaped activated carbon after repeated adsorption and plasma desorption decreases while the average pore diameter increases, and the amount of oxygen functional groups at surface increase as well.

關鍵字(中)

★ 異丙醇
★ 脫附效率
★ 活性碳
★ 非熱電漿

關鍵字(英)

★ desorption efficiency
★ activated carbon
★ nonthermal plasma
★ IPA

論文目次

摘要I
Abstract II
誌謝III
目錄IV
圖目錄VI
表目錄VIII
第一章前言1
1-1 研究緣起1
1-2 研究內容2
第二章文獻回顧3
2-1 異丙醇性質3
2-1-1異丙醇特性及來源3
2-1-2異丙醇的危害4
2-2 有機揮發性氣體控制技術5
2-3電漿生成原理、類型及反應機制10
2-3-1電漿生成原理10
2-3-2電漿型式13
2-4氣相吸附18
2-4-1氣相吸附原理18
2-4-2影響吸附之因子20
2-4-3貫穿曲線22
2-5非熱電漿結合吸附劑吸/脫附污染物24
2-5-1吸附劑種類24
2-5-2脫附技術25
2-5-3非熱電漿結合吸附劑33
第三章研究方法與設備36
3-1 研究流程與系統配置36
3-1-1 吸附實驗系統配置37
3-1-2 電漿結合吸附劑吸/脫附實驗系統配置38
3-2 研究使用吸附劑38
3-3 研究設備39
3-3-1 氣體供應39
3-3-2實驗參數控制系統40
3-3-3反應器40
3-3-4 電力供應設備41
3-3-5 電能消耗量測設備42
3-3-6反應物與產物分析設備42
3-4 研究方法43
3-4-1 吸附實驗43
3-4-2電漿結合吸附劑吸/脫附實驗44
第四章結果與討論47
4-1 吸附劑之BET比表面積與孔徑尺寸47
4-2 吸附能力實驗48
4-3 脫附氣體種類之影響51
4-3-1 脫附時間51
4-3-2 脫附量與脫附效率52
4-3-3 脫附副產物55
4-3-3 脫附物種選擇性58
4-3-4 重覆吸/脫附之實驗59
4-4 脫附氣體流率之影響70
4-5 不同吸附劑於脫附量之影響75
4-6 脫附氣體種類反應推估79
4-7 電漿脫附後吸附劑之物化特性84
4-7-1 BET比表面積與平均孔洞尺寸84
4-7-2 表面官能基85
4-8 熱脫附實驗87
第五章結論與建議89
5-1 結論89
5-2 建議90
參考文獻 91

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指導教授

張木彬(Moo-been Chang)

審核日期

2011-7-21

推文