利用氧化及吸收法處理三甲胺和異丙醇結合超重力旋轉床之研究

Trimethylamine and Isopropanol Control by Oxidation and Absorption in a Rotating Packed Bed

章家語(Chia-Yu Yonny Chang)

指導教授 ： 蔣本基

國立臺灣大學/工學院/環境工程學研究所/碩士(2021年)

https://doi.org/10.6342/NTU202102482

摘要

隨著經濟的快速增長，生產過程中使用了許多不同的化學物質，這導致化學和電子工業產生了大量的揮發性有機化合物（Volatile Organic Compounds, VOCs）。因此，這項研究以親水性高，濃度高的氣相揮發性有機化合物作為本研究的方向，然後使用不同的化學藥品和不同的操作參數去找出理想的條件。期望達到低成本、佔地少，並能高效率去除VOCs，本研究以四種方法去設計，例如：吸收、氧化、先氧化再吸收和先吸收後氧化。發現三甲胺(Trimethylamine, TMA)的去除效率受氣液比的顯著影響。例如，當氣液比低於 20 時，觀察到三甲胺的去除效率為 80-85%。其中，最佳實踐是通過引入二氧化氯作為三甲胺高達99.96%，其中超重力因子為9.56、氣液比為14.29。另外，本研究將會以半導體常使用有機溶劑-異丙醇(Isopropyl alcohol, IPA) 摸擬實場的排放約10000ppm的濃度系統的空氣流量為15 LPM，並透過超重力旋轉填充床進行吸收和氧化.並達到煙道排放標準400ppm以下為目標。並發現異丙醇透過吸收法，該去除效率在80-92%的範圍內。加入氣相氧化劑後，去除效率高達96.52%，可達到400 PPM的排放標準。異丙醇和三甲胺總傳質係數都可以利用無因次分析，建立經驗公式，預估誤差分別約為 ±25% 和 ±12%。最後本研究提出 Pcap 針對能源消耗和去除效率做鏈結，並以其實驗計做出成本分析。

關鍵字

超重力技術 ； 三甲胺去除 ； 異丙醇去除 ； 二氧化氯 ； 臭味控制

並列摘要

With the rapid economic growth, many different chemical substances are used in the production process, which has led to the production of a large number of volatile organic compounds (Volatile Organic Compounds, VOCs) in the chemical and electronic industries. Therefore, this research takes the highly hydrophilic, high-concentration vapor-phase VOCs as the direction of this research, and then uses different chemicals and different operating parameters to find the ideal conditions. We hope to achieve low cost, small footprint, and high efficiency in removing VOCs. This study adopts four methods to design, which include: (1) absorption; (2) oxidation; (3) first oxidation and then absorption, and; (4) first absorption and then oxidation.

The removal efficiency of TMA was found to be significantly affected by the gas-liquid (G/L) ratio. For instance, when the gas-liquid ratio was lower than 20, the removal efficiency of TMA was observed from 80-85%. Among them, the best practice for TMA removal by introducing chlorine dioxide as absorbent and oxidant was found to be 99.96%, in which the high-gravity factor is 9.56 and the gas-liquid ratio is 14.29. In addition, this research will use Isopropyl alcohol (IPA), which is an organic solvent commonly used in semiconductors, to simulate the actual field emission of about 10,000 ppm. And the air flow rate is 15 LPM through a rotating packed bed for absorption and oxidation. The goal is to reach the flue emission standard of below 400ppm. It was also found that the removal efficiency of isopropanol was within a range of 80-92% through the absorption method. After adding the gas-phase oxidant, the removal efficiency was up to 96.52% which can meet the emission standard of 400 PPM. Both IPA and TMA overall mass transfer coefficient can be estimated by the dimensionless group with the deviation about ±25% and ±12%, respectively. Finally, this research proposes that Pcap links to energy consumption and removal efficiency, and a cost analysis was established based on its experimental calculations.

並列關鍵字

Rotating packed bed ； Trimethylamine removal ； Isopropyl alcohol removal ； Chlorine dioxide ； Odor control

參考文獻

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