ACF蒸气再生对于VOCs再吸附性能的影响研究

Effect of ACF Steam Regeneration on Readsorption Performance of VOCs

ACF吸附-蒸气再生工艺在医药行业有较为广泛的应用,由于生产工艺的多样性,废气污染因子差异较大,工作选取二氯甲烷、乙酸乙酯、异丙醇、二甲苯、丙酮为特征污染物,研究其在实际工程应用条件下的吸附水蒸气再生效果,结果表明,二氯甲烷受蒸气再生影响最大,其次为二甲苯。二甲苯为高沸点物质,蒸气再生温度为120℃,其脱附残留较高;对二氯甲烷冷烘干时间及热再生研究,发现其受炭纤维脱附后含水量较高的影响较大,采用热再生的方式其吸附容量的衰减也较为明显。实验室模拟结合工程应用实例表明,废气中二氯甲烷浓度含量较高时,不宜选用ACF吸附-蒸气再生工艺。

ACF adsorption steam regeneration process was widely used in the pharmaceutical industry.Due to the diversity of production processes,there were significant differences in exhaust gas pollution factors.In this work,dichloromethane,ethyl acetate,isopropanol,xylene,and acetone were selected as the characteristic pollutants to study the regeneration effect of adsorbed water vapor under actual engineering application conditions.The results showed that dichloromethane was the most effectively regenerated by steam,followed by xylene.Xylene was a high boiling point substance,and its vapor regeneration temperature was 120℃,resulting in high desorption residues.The study on the cold drying time and thermal regeneration of dichloromethane found that it was greatly affected by the high water content of carbon fibers after desorption,and the attenuation of adsorption capacity by using thermal regeneration was also significant.Laboratory simulation combined with engineering application examples indicate that the ACF adsorption steam regeneration process was not suitable for use when the concentration of dichloromethane in waste gas is high.