摘要
吸收法处理挥发性有机废气的关键是表面活性剂的选择.选取聚乙二醇水溶液处理甲苯废气为研究对象,测定了4种聚乙二醇水溶液的临界胶束浓度及其对甲苯的增溶作用,并在填料塔中探究了吸收剂中聚乙二醇浓度、进口气体中甲苯浓度和液气比对甲苯去除率的影响.结果表明,水溶液中聚乙二醇浓度达到1倍临界胶束浓度时,其对甲苯有显著的增溶作用和去除效果,且甲苯去除率随着增溶量的增加而增大,两者呈正相关.因此,结合临界胶束浓度和增溶量的测定可用于表面活性剂的初步筛选.优选聚乙二醇-600水溶液作为吸收剂,在空气流量300 m L/min,液体喷淋量55 m L/min,进口气体中甲苯浓度800 mg/m3,温度25℃条件下,浓度为1倍临界胶束浓度的聚乙二醇-600水溶液对甲苯的去除率达到83%;且随着吸收剂浓度、进口气体中甲苯浓度的增大,去除率增加,在填料吸收塔中存在最优的液体喷淋量.
The key to efficient volatile organic compounds （VOCs） removal by absorption is the appropriate surfactant. Polyethylene glycol solutions were chosen to absorb VOCs from the industrial plants. Firstly the critical micelle concentration （CMC） and the toluene solubilization of four kinds of PEG aqueous solutions were determined. And then the effects of the PEG concentration, the inlet toluene concentration and the liquid spray flow rate on the toluene removal rate were studied in a packed absorption tower. The results suggested that both the toluene solubilization and the toluene removal efficiency in the PEG aqueous solutions were enhanced significantly when the surfactant concentration reached above CMC. Furthermore, the toluene removal rate increased with the increment of solubilization and there was a positive correlation between them, which meant that the preliminary surfactant screening could be accomplished through the determination of CMC and the solubilization capacity in the surfactant aqueous solutions. The preferred PEG-600 aqueous solutions were used as the absorbent, and the toluene removal rate reached 83% when the gas flow rate was 300 mL/min, the liquid flow rate was 55 mL/min, the inlet toluene concentration was 800 mg/m^3, T=25 ℃ and the PEG concentration was 1 CMC. The toluene removal rate would increase when either the PEG concentration or the inlet toluene gas concentration increased, and there was an optimal liquid flow rate.
出处
《河南科学》
2015年第2期185-190,共6页
Henan Science
基金
国家自然科学基金项目资助(51003098)
关键词
聚乙二醇水溶液
甲苯
吸收
增溶作用
临界胶束浓度
polyethylene glycol aqueous solutions
toluene~ absorption： solubilization
critical micelle concentration
