DC 欄位 | 值 | 語言 |
dc.contributor | 戴怡德 | zh-TW |
dc.contributor | 臺灣大學:化學工程學研究所 | zh-TW |
dc.contributor.author | 郭耿佑 | zh-TW |
dc.contributor.author | Kuo, Keng-You | en |
dc.creator | 郭耿佑 | zh-TW |
dc.creator | Kuo, Keng-You | en |
dc.date | 2009 | en |
dc.date.accessioned | 2010-06-30T06:11:45Z | - |
dc.date.accessioned | 2018-06-28T17:12:05Z | - |
dc.date.available | 2010-06-30T06:11:45Z | - |
dc.date.available | 2018-06-28T17:12:05Z | - |
dc.date.issued | 2009 | - |
dc.identifier.other | U0001-0608200913541701 | en |
dc.identifier.uri | http://ntur.lib.ntu.edu.tw//handle/246246/186923 | - |
dc.description.abstract | 為解決二氧化碳過度排放而造成的溫室效應,並減緩其惡化的現象,近十年來許多研究文獻利用天然礦石或工業廢棄物,經由碳酸化將二氧化碳固定為碳酸鈣;該方法稱為礦石封存法並且為目前最有效的方法之一。 本研究以實驗室以往的研究為基礎,以驗證鈣矽石碳酸化機制為目的,首先以高壓電極量測溶液pH值,探討其對鈣矽石碳酸化轉化率的影響。從所有組別的pH值隨時間變化圖可發現,二氧化碳的溶解平衡相當迅速,故在碳酸化機制三步驟中二氧化碳的吸收與解離並非速率決定步驟。另外在鈣矽石碳酸化中,溫度及溶液pH值均為重要的變數:在220psig下,當反應溫度為150℃時有最高的轉化率為78%;而80℃下,當溶液pH值在最佳範圍為5.5~6.5時,最高之轉化率為40%。 另一方面,用氮氣提供壓力與碳酸氫鈉供應碳酸根以確認其取代超臨界二氧化碳的可行性,並比較壓力與攪拌葉片轉速等外力的效應。在溫度150℃、壓力15bar、轉速500rpm及碳酸氫鈉3.2M條件下反應2h,轉化率即可達48%,此顯示碳酸化確實可以進行,故超臨界二氧化碳並非必要條件。同時,從反應後樣品之SEM圖可驗證以往所提之反應機制無誤,且攪拌葉片轉速應為較具影響的外力來源。實驗結果顯示,當壓力與轉速分別高於6.5bar與為100rpm時,即可得到較高的轉化率。最後,由本研究之結果對此鈣矽石碳酸化機制提出一更詳細的說明。 | zh-TW |
dc.description.abstract | In the past ten years, numerous studies concerning CO2-reduction have been studied to mitigate greenhouse effect, which was mainly due to the release of CO2 from industries. Among them, mineral carbonation was a potential and promising method, though which CO2 is fixed in a “container” such as natural rocks or industrial wastes. Based on the previous experience in our laboratory, we postulated a mechanism of the mineral carbonation of wollastonite and tried to prove it in this study. First, a high pressure pH electrode was installed to measure the pH value of solution and to discuss the pH effect on the conversion of wollastonite carbonation. Most of pH-t diagram showed that dissolution of CO2 reached equilibrium so fast that it could not be the rate-determining step. Moreover, temperature and the pH value were found to be the most important variables in wollastonite carbonation; the conversion being 78% at the highest temperature of 150℃ under 220psig, and being 40% at 80℃and an optimal pH range of 5.5~6.5. Secondly, high pressure nitrogen and sodium bicarbonate were used respectively as destructive energy and source of carbonate ion to replace supercritical CO2. At 150℃, 15bar, 500rpm, and concentration of sodium bicarbonate 3.2M, a conversion of 48% was reached in 2h, thus proving that supercritical CO2 is not a necessary condition for mineral carbonation. Besides, a mechanism proposed in the previous research was checked using the SEM photos, and it was concluded that stirred speed was more important than pressure. A significant conversion was obtained when the wollastonite carbonation proceeded at a pressure and stirred speed higher than 6.5bar and 100rpm respectively. Finally, a more complete mechanism of wollastonite carbonation was proposed. | en |
dc.description.tableofcontents | 口試委員審定書 Ⅰ謝 Ⅱ文摘要 Ⅲ文摘要 Ⅳ錄 Ⅴ索引 ⅤⅢ索引 ⅩⅢ一章、緒論 1二章、文獻回顧 4 2-1反應物鈣矽石簡介 4 2-2生成物碳酸鈣簡介 6 2-3二氧化碳封存技術 7 2-4礦石封存法 8 2-4-1封存原理 8 2-4-2碳酸化方法之分類 9 2-5矽酸鹽類礦石之碳酸化 10 2-6鈣矽石碳酸化之機制 14三章、研究方法 17 3-1樣品製備 17 3-1-1藥品來源 17 3-1-2鈣矽石樣品準備方法 18 3-2物性分析 19 3-2-1掃描式電子顯微鏡(SEM)觀察 19 3-2-2 X-ray繞射分析 19 3-2-3熱重熱示差掃描分析儀(TG/DTA) 19 3-2-4 EDTA滴定測量鈣矽石之鈣含量 20 3-3碳酸化反應器 21 3-3-1葉片攪拌高溫高壓反應器 21 3-3-2加裝pH電極之葉片攪拌高溫高壓反應器 23 3-4碳酸化反應實驗步驟 26 3-4-1葉片攪拌高溫高壓反應器 26 3-4-2加裝pH電極之葉片攪拌高溫高壓反應器 27 3-5鈣矽石碳酸化反應轉化率定義 28四章、結果與討論 29 4-1未反應鈣矽石物性分析結果 29 4-1-1掃描式電子顯微鏡(SEM)觀察 29 4-1-2 X-ray繞射分析 30 4-1-3熱重熱示差掃描分析儀(TG/DTA)量測 31 4-1-4 EDTA滴定測量鈣矽石之鈣含量 32 4-2反應器加裝pH電極之實驗結果 33 4-2-1溫度效應 34 4-2-2反應時間效應 36 4-2-3壓力效應 40 4-2-4溶液pH值效應 43 4-3以碳酸氫鈉為碳酸根來源之實驗結果 49 4-3-1壓力效應與轉速效應 49 4-3-2由SEM圖說明外力在碳酸化機制扮演的角色 51 4-4鈣矽石碳酸化機制總結 54五章、結論 57號說明 59考文獻 60錄A 實驗數據 64錄B TGA附圖 66錄C pH-t 附圖 76 | en |
dc.format.extent | 17983790 bytes | - |
dc.format.mimetype | application/pdf | - |
dc.language | zh-TW | en |
dc.language.iso | en_US | - |
dc.subject | 鈣矽石 | zh-TW |
dc.subject | 碳酸化機制 | zh-TW |
dc.subject | 轉化率 | zh-TW |
dc.subject | 操作變數效應 | zh-TW |
dc.subject | wollastonite | en |
dc.subject | carbonation mechanism | en |
dc.subject | conversion | en |
dc.subject | effects of operating variables | en |
dc.title | 鈣矽石碳酸化機制之探討 | zh-TW |
dc.title | Mechanism of Wollastonite Carbonation | en |
dc.type | thesis | en |
dc.identifier.uri.fulltext | http://ntur.lib.ntu.edu.tw/bitstream/246246/186923/1/ntu-98-R96524036-1.pdf | - |
item.openairecristype | http://purl.org/coar/resource_type/c_46ec | - |
item.openairetype | thesis | - |
item.languageiso639-1 | en_US | - |
item.grantfulltext | open | - |
item.cerifentitytype | Publications | - |
item.fulltext | with fulltext | - |
顯示於: | 化學工程學系
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