Ethylene Oxide Removal from simulated Wastewater

在模擬廢水移除環氧乙烷之研究

吳和生(Ho-Shing Wu) ； 葉金文(Chin-Wen Yen)

《Journal of the Chinese Institute of Chemical Engineers》 33卷3期 (2002/05) Pp. 243-251

https://doi.org/10.6967/JCICE.200205.0243

摘要

本研究目的在測試氣提法與吸附法去除環氧乙烷(ethylene oxide)的能力，以解決環氧乙烷的水污染問題。在吸附法方面：使用三種Amberlite樹脂(XAD-4, XAD-7, XAD-16)和兩種活性碳纖維(CP-900, CP-1100)在模擬廢水中進行恆溫批次吸附，其中以XAD-16為最佳，單位吸附量隨著吸附劑量增加而減少。在氣提法分別以半批次式及連續式填充塔進行環氧乙烷去除，在高氣體流量和高溫下可增進氣提效率。求得氣體及液體之質傳係數以解釋環氧乙烷去除現象。在氣提出之環氧乙烷再以化學吸收處理，以HCl和H2SO4進行之酸化反應比較佳，吸收效率隨著酸濃度增加而增加，相關動力學參數（反應速率常數和活化能）一併求得以瞭解回收現象。

並列摘要

The sorption and removal behaviors of ethylene oxide (EO) from wastewater were investigated using the adsorption and stripping methods. Three Amberlite resins (XAD-4, XAD-7, and XAD-16) and two activated carbon fibs (CP-900 and CP1100) were employed to adsorb EO from simulated wastewater in a batch reactor. The best adsorbent was XAD-16. The unit-adsorbed ratio of EO to resin decreased with increasing amounts of resin. In the stripping method, two operating types, semibatch and continuous packed bed, were employed to remove EO. High airflow rate and high temperature were favorable for increasing the stripping efficiency. The total-tower liquid mass-transfer coefficient KL and gas mass-transfer coefficient KG were also obtained. In the EO recovery system, EO removal from waste gas was conducted by means of chemical absorption. The addition of an acidic agent (HCl and H2SO4) could increase the absorption efficiency in an absorption tower. The incremental concentration of the acidic agent increased the absorption efficiency. The absorbed capability of EO for both H2SO4 and HCl was high, particularly for H2SO4. The reaction-rate constant and Arrhenius activation energy were also obtained.

並列關鍵字

Ethylene oxide ； Stripping ； Sorption ； Mass transfer