添著活性碳對甲苯吸附處理與等溫吸附特性之研究

Studies on the Treatment of Toluene and Isothermal Adsorption Kinetic Model of Impregnated Activated Carbon

劉鎮宗(Cheng-Chung Liu) ； 陳志浩(Richard Chen) ； 黃香儒(Ju-Hsiang Huang) ； 蔡嘉松(Jia-Sung Tsay) ； 林妍希(Yan-Xi Lin) ； 張章堂(Chang-Tang Chang)

《宜蘭技術學報》 9期工學專輯 (2002/12) Pp. 141-152

https://doi.org/10.6179/nit.bce.2002.09.23

摘要

近幾十年來因工業發展迅速，苯（Benzene）、甲苯（Toluene）、二甲苯（Xylene）應用於化學藥品之原料及各種化工廠之溶劑等應用很廣，引起空氣品質惡化並影響員工之健康。本研究主要目標是針對甲苯在所引起之環境空氣污染，利用添著活性碳吸附處理技術，來進行活性碳對甲苯之吸附與各處理機制的分析。本研究用一般、鹼性與酸性活性碳作為吸附劑，以甲苯作為代表性吸附劑，於各種入流濃度（700、600、500、400ppm），溫度（40、30、25、15°C），流速（20、25、30、35cm/sec） 進行甲苯處理及探討等溫吸附模式，以了解各種活性碳吸附甲苯之處理特性。研究結果顯示吸附量大小，隨吸附之甲苯在濃度而改變，入口濃度越高，吸附能力增加。溫度低時貫穿時間較短。若流速較大時，造成吸附能力降低。三種活性碳以酸性活性碳之吸附量最大，且其吸附能力遠高於一般活性碳及鹼性活性碳。當濃度在500ppm時，一般活性碳的吸附能力約為18.63mg/g，鹼性活性碳的吸附能力約為56.56 mg/g，而酸性活性碳的吸附能力為90.26mg/g。

關鍵字

甲苯 ； 添著活性碳 ； 流速 ； 等溫吸附模式

並列摘要

Benzene, toluene and xylene have been employed extensively as materials of chemical reagents and solvents in chemical industries during the past decades. They have not only caused air pollution but also been harmful to human health. In this study, three impregnated activated carbon (neutral, alkaline, acidic) were used to be adsorbents of toluene. The purpose of this paper is to study the isothermal adsorption kinetic model of impregnated activated carbon (AC) interacted with toluene at different operation parameters, including the variation of toluene concentration (400, 500, 600, 70Oppm), flow velocity (20, 25, 30, 35 cm/sec) as well as temperature (20, 25, 30, 40°C ). Furthermore, the Freundlich and Langmuir model were used to establish isothermal adsorption model. In this study, there are three kinds of impregnated AC as absorbents, neutral AC, acidic AC and alkaline AC. The results indicated that the adsorbed capacity increased with an increase of concentration. However, it decreased with an increase of flow velocity and temperature. At 500ppm, the amount of toluene adsorbed by neutral AC, alkaline AC and acidic AC was 18.63, 56.56, 90.26mg/g, respectively. Besides, the result showed that adsorption capacity of acidic AC is greater than alkaline AC and neutral AC.

並列關鍵字

toluene ； impregnated activated carbon ； flow velocity ； isothermal adsorption model