开展了超高交联吸附树脂对气体中二氯甲烷的静态吸附行为研究,分别采用Langmuir、Freundlich和Dubinin-Astakov模型方程对吸附平衡数据进行拟合分析,拟合结果表明,Dubinin.Astakov方程能较好地拟合吸附平衡数据,表明在吸附过程中微孔填充起着很重要的作用:采用固定床吸附工艺研究了二氯甲烷在树脂上的动态吸附行为,用Yoon.Nelson模型对穿透曲线进行拟合,实验数据与模拟值吻合良好。在实验研究的基础上开发了二氯甲烷废气超高交联树脂吸附回收工艺并建立工业化装置,处理效果良好、运行稳定。
Adsorption equilibrium and breakthrough curves; of dichloromethane vapor onto hypercrosslinked polymeric resin were investigated. Langmuir, Freundlich and Dubinin-Astakov models were used to correlate the experimental data, respectively. The results showed that the experimental data were found to fit well by Dubinin-Astakov model, which indicated that pore-filling was the dominating mechanism for dichloromethane adsorption. The breakthrough curves were correlated by Yoon-Nelson model The calculated breakthrough curves were in high agreement with corresponding experimental data. Moreover, the hypercrosslinked polymeric resins were utilized to recover dichloromethane from waste gas discharged from a chemical factory. 95% of dichloromethane was recovered and reused, and the adsorption unit system has been operated for one year