固定床不同床深下的米格列醇离子交换性研究

为考察米格列醇在固定床树脂不同堆积高度下的离子交换吸附行为,采用称量不同量的D001树脂装入离子交换柱中,通过固定床堆积高度的改变,在上样液流速和浓度固定前提下研究米格列醇溶液与树脂间的离子交换规律性,并结合床深服务时间(BDST)模型对此条件下固定床透过曲线进行分析评价。结果表明:固定床堆积高度的增加,提高了树脂与米格列醇溶液间的接触时间和树脂总的可交换离子数,有利于离子交换过程的进行,树脂的吸附质量和吸附率都得到了相应提高,堆积高度的增加使饱和点时间变长,吸附效率变小;对固定床透过曲线进行BDST模型拟合分析,结果表明:该模型与实验值间具有很高的相关系数,计算的相关参数间差异很小,对于该离子交换体系,表明BDST模型能很好地应用于该体系的离子交换吸附过程。

Ion exchange behavior of miglitol in different fixed-bed depth

In order to investigate the ion exchange adsorption behavior of miglitol in different fixed bed depth,the different quantitative D001 resins were placed into ion exchange column,and the ion exchange law of miglitol and resins was studied by changing the stack height of fixed bed in premise of the same flow velocity and fixed concentration of sample.In this condition,the breakthrough curves of fixed bed were analyzed and evaluated based on the bed depth service time(BDST) model.The results show that the contact time of ion exchange and the total exchangeable ion numbers of resins are increased with the augment of the fixed-bed stack height,which is more favorable to ion exchange process.The adsorption capacity and adsorption rate of resin are also increased accordingly.The higher stack height of fixed bed can prolong the equilibrium point time and lower the adsorption efficiency.In addition,the mathematics model of BDST was used to fit the experimental data of fixed-bed breakthrough curves,which shows a high correlation coefficient.Meanwhile,there is a little difference between the calculated parameters and the experimental values,which infers that BDST model can be well applied to the system of ion exchange process.