D001大孔强酸树脂脱除二氯甲烷微量水的吸附研究

Study on Adsorption of D001 Macroporous Strong Acid Resin for Removing trace Water From Dichloromethane

本论文研究了二氯甲烷-水体系在强酸性树脂上的吸附平衡,分别采用Langmuir方程、Freundlich方程对吸附平衡实验数据进行拟合;分别测量了二氯甲烷-水体系在强酸性树脂上在不同温度、初始浓度的吸附动力学数据;还研究了二氯甲烷-水体系在实验室中穿透过塔的工艺。结果表明Langmuir方程对树脂的吸附平衡数据拟合较好;确定了合适的操作条件,表明温度越低褐色树脂的吸附效果越好,得到的二氯甲烷的纯度达到99.95%以上。通过实验表明常态下二氯甲烷溶液的初始浓度越高,树脂对其的吸附效果越好。在穿透实验中求取了吸附带的移动速度Va、吸附带长度Za、总传质系数Kfav等重要操作参数。上述研究成果为二氯甲烷脱水工艺放大和生产设计提供了重要的基础数据。

In this thesis,dichloromethane-water system’s adsorption equilibrium in strong acidic resins was studied.The experimental data of the adsorption equilibrium was regressed by using the Langmuir equation and the Freundlich equation,separately.The adsorption kinetics data of dichloromethane-water system at different temperatures,initial concentration were measured.Adsorption experiment of methylene chloride-water system was performed in a lab-scale adsorption tower.Main results and conclusions are as follows:The results showed that the Langmuir equation fitted the adsorption equilibrium data of resins better.Defining suitable operating conditions,the results had showed that the lower the temperature was the better adsorption effect of the brown resins we could get.The purity of dichloromethane could increase up to more than 99.5%.The experimental results showed that the higher the initial concentration of the dichloromethane solution under normal,the better adsorption effect of the brown resins we could get.In the penetration experiment,important operating parameters such as moving speed of the adsorption zone(va),length of the adsorption zone(za),overall mass transfer coefficient(Kfav)had been calculated.The aforementioned research has provided basic data for dichloromethane dehydration scaling-up and production design.