正己烷蒸气在吸附树脂上的吸附平衡和穿透特性研究

The Study on the Adsorptionequilibrium and Penetration Characteristics of N-hexane Vapor in Adsorption Resin

吸附法被广泛应用于挥发性有机化合物(VOCs)的排放控制研究。本文采用气相色谱测定了293 K,308 K,323 K下,正己烷在两种不同结构树脂上的的吸附平衡和穿透曲线。利用Langmuir方程和Freundlich方程对不同温度下的吸附等温线进行拟合,Freundlich方程的拟合效果更好(R2>0.95),说明并非单层吸附。用Dubinin-Astakov(D-A)方程对实验数据进行拟合相关系数R2≥0.99,说明可根据某一温度下的吸附等温线预测另一温度下的吸附等温线。大孔树脂Macro首次吸附能力低于超高交联树脂Hyper,首次脱附率大于Hyper,首次脱附后的吸附能力和Hyper相当。

Adsorption method has been widely used in the study of emission control of volatile organic compounds （VOCs）. The adsorption equilibrium and breakthrough curves ofn-hexane on two different structural resins are measured by gas chromatography at 293 K, 308 K and 323 K. The adsorption isotherms on different temperatures are fitted by Langmuir equation and Freundlich equation. The fitting effect of Freundlich equation is better （R2〉0.95）, indicating that it is not monolayer adsorption. The fitting coefficient （R2〉0.99） of Dubinin-Astakov （D-A） equation implies that the adsorption isotherm on one temperature can be used to predict the adsorption isotherms on other temperature. The first time adsorption capacity of macroporous resin （Macro） is lower than that of hypercrosslinked resin （Hyper）. The first time desorption rate of Macro is more than that of Hyper. In addition, the adsorption capacity after the first time desorption of Macro is equal to that of Hyper.