琥珀酸和乳酸在树脂HBCT-8上的吸附平衡

Adsorption Equilibria of Succinic Acid and Lactic Acid on HBCT-8 Resin

模拟移动床色谱分离琥珀酸和乳酸的前提是确定它们在合适的固定相上的吸附平衡参数。树脂HBCT-8可以将琥珀酸和乳酸很好的分离,文中用迎头法在30～50℃的温度内进行了琥珀酸和乳酸在该树脂上的单组份吸附平衡试验,酸的浓度为0～10 g/L。试验结果表明:琥珀酸和乳酸在该树脂上的吸附符合朗格缪尔和双朗格缪尔模型,并且2种酸在树脂HBCT-8上的吸附均为放热的,这种效应被表达在模型方程中,由此产生的温度依赖型模型方程在试验温度内可以准确的预测琥珀酸和乳酸的吸附平衡数据。

It was found that a HBCT-8 resin well separated succinic acid and lactic acid.On the basis of the selected adsorbent,the single-component adsorption Equilibration of succinic acid and lactic acid were measured using a staircase frontal analysis method at the liquid-phase concentrations up to 10 g/L.The adsorption data were correlated with the Langmuir and the bi-Langmuir adsorption models.The effect of temperature on the Langmuir and bi-Langmuir equilibrium constants was examined.The acid adsorption reaction on HBCT-8 was exothermic.This temperature effect was incorporated into each model equation.The temperature-dependent form of the model equation can accurate predict the adsorption equilibrium at 30 to 50 ℃.The adsorption equilibrium data and the model parameters reported in this study will be of great value in designing SMB process that is packed with the HBCT-8 resin and targeted at separating succinic acid and lactic acid.