活性碳與沸石吸附之工程實踐評估;Evaluation of Activated Carbon and Zeolite Adsorption for Field Application

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题名:	活性碳與沸石吸附之工程實踐評估;Evaluation of Activated Carbon and Zeolite Adsorption for Field Application
作者:	粘愷峻;Nien, Kai-Chun
贡献者:	環境工程研究所
关键词:	活性碳吸附;沸石濃縮轉輪;溶劑回收;丁二酮;均三甲苯;揮發性有機物;Activated carbon adsorption/desorption;zeolite adsorption rotor;solvent recovery;butanedione (BDO);mesitylene;volatile organic compounds (VOCs)
日期:	2018-07-27
上传时间:	2018-08-31 15:08:44 (UTC+8)
出版者:	國立中央大學
摘要:	吸附(濾材)技術已廣泛應用於揮發性有機物(VOCs)之去除，乃一種有效的控制技術，固定床活性碳回收設備及沸石濃縮轉輪焚化系統技術為業界經常採用之技術，但實廠上仍面臨一些應用限制。有鑑於此，本研究致力於改善活性碳及沸石吸附系統之效能，以期提供相關改善建議方法及健全空氣污染防制技術，為提升空氣品質做出貢獻。於活性碳吸、脫附過程抑制丁二酮(butanedione, BDO)生成的研究方面，本研究測試5種商用活性碳、9種改質劑、3種溶劑、多種浸置時間與溫度的處理流程，超過28組以上的活性碳改質方法。實驗結果顯示使用適當的改質劑、較高的改質劑負荷、以氮氣作為脫附氣體可有效降低MEK反應生成BDO。證實以改質之活性碳進行溶劑回收與揮發性有機物控制，初期投資成本雖較高且操作費用較貴，但可大幅提升系統操作之安全性。此外，在提升沸石濃縮轉輪吸附大分子均三甲苯性能的研究方面，本研究發現單一種沸石基材吸附劑無法通用於分子尺寸不同的VOCs，對噴塗製程廢氣的混合性VOCs而言，本研究整合微孔洞(H-ZSM-5)與中孔洞(MCM-41)兩類沸石串連的工程解決方案。研究結果指出在含甲苯與均三甲苯兩種VOCs濃度各50 ppm的進流排氣，單獨使用H-ZSM-5-25沸石的貫穿時間為3.5 min，單獨使用MCM-41-AS 沸石的貫穿時間為6.5 min，串聯兩類型沸石的貫穿時間明顯延長至20.5 min，是單一沸石的3.2倍或5.9倍，實驗結果證實，串聯兩類型沸石組合可適用於同時含有小分子與大分子的噴塗製程VOCs之有效控制。;Adsorption technologies have been widely used to control the emissions of volatile organic compounds (VOCs), and it is regarded as an effective way for VOCs removal. Especially, activated carbon and zeolite are commercially available for field application. However, they still have some limitations. Therefore, this study is motivated to improve the performance of adsorption systems of activated carbon and zeolite. First, methods for inhibiting butanedione (BDO) formation during activated carbon adsorption-desorption of methyl ethyl ketone (MEK) were investigated. In total, more than 28 types of modified activated carbons were extensively examined. The tests included five types of commercial activated carbons, nine kinds of modifiers, three kinds of solvents, and a variety of processing time and temperatures. Experimental results indicated that BDO formation from MEK oxidation could be greatly inhibited by suitable modifier, high modifier loading, and adopting N2 as desorption medium. For instance, BDO concentration in the test with raw activated carbon as adsorbent was 0.123%, and decreased to 0.0115% as modified activated carbon was applied, indicating that BDO concentration could be reduced by more than 10 times. Although the capital and running costs would increase by using modified activated carbon for solvent recovery, the operational safety can be greatly improved and it is economically feasible. On the other hand, zeolite adsorption rotor was studied for the enhancement of mesitylene adsorption. It is found that a rotor with single type of zeolite could not achieve good removal efficiency due to various VOCs molecular sizes in the exhausts of spray coating processes. This study hence proposed a possible engineering solution with the integration of both micropore (H-ZSM-5) and iii mesopore (MCM-41) zeolites. Experimental results indicated that the breakthrough time with H-ZSM-5-25/MCM-41-AS as adsorbent was greatly extended to 20.5 min. On the other hand, the breakthrough times were 3.5 and 6.5 min, respectively, when H-ZSM-5 and MCM-41-AS were applied as adsorbent, respectively, for the gas stream containing 50 ppm toluene and mesitylene. Obviously, the breakthrough time of the combined zeolite developed can increase by 3.2 - 5.9 times if compared with individual zeolite. It is proved that combined H-ZSM-5-25/MCM-41-AS zeolite as adsorbent is suitable for simultaneous and effective removal of VOCs from spray coating exhaust.
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