流化床用树脂基球形活性炭及其VOCs吸附性能

以聚苯乙烯树脂为原料，采用水蒸气活化、氯化锌活化及水蒸气?氯化锌协同活化方法制备了3种流化床用树脂基球形活性炭，采用固定床反应器考察了活性炭对乙酸乙酯的动态吸附行为，对比了其传质区长度，并利用Yoon?Nelson模型对实验数据进行了拟合. 结果表明，3种活性炭的摩擦磨损指数均小于0.1%，耐磨性能出色，物理、化学协同活化活性炭比表面积高达1702.49 m2/g，对二甲苯的静态吸附容量达0.86 g/g.

Polymer-based spherical active carbon and its VOCs adsorption performance for fluidized bed application

Volatile organic compounds (VOCs) are the most common air pollutants emitted from chemical, petrochemical and allied industries. Adsorption is one of the most effective methods of controlling VOCs emission. Fluidized bed adsorption/desorption process is proposed for handling large flows of contaminated gaseous streams. The expected advantages are continuous processing, the ability to treat large flows under moderate pressure drop, the possibility to handle dusty gases, good mass and heat transfer between fluid and particles. For fluidized bed adsorption process the adsorbents are subject to strong attrition and conventional active carbons particles are not suitabe. A perfectly spherical activated carbon with strong attrition resistance and good VOC adsorption ability is developed for fluidized bed application. Polystyrene beads were used as precursor to make polymer-based active carbon (PCB) adsorbent through different activation methods, including steam activation, ZnCl2 activation and synergistic activation with both steam and ZnCl2. The active carbon adsorbent with synergistic activation presented high specific surface area (1702.49 m2/g) than that from other activation process. The measurement of static adsorption capacity of PCB with dimethylbenzene, acetone, ethyl acetate and hexane for different PBS adsorbents are conducted and presented. In the research of dynamic adsorption, a fixed bed reactor was used to explore the ethyl acetate adsorption behavior on PCB adsorbents and the mass transfer zone length was obtained. Yoon?Nelson model was used to describe the adsorption behavior of ethyl acetate on adsorbents and model parameters are compared for different active carbon adsorbents. The particle size distribution of PCB adsorbents is between 0.208?0.832 mm, with the averaged particle diameter of 0.495 mm. The PCB adsorbents had good abrasion resistance with attrition index less than 0.1% and that is suitable for fluidized bed application.