柠檬酸在D354树脂上的离子交换研究

研究了大孔型弱碱性阴离子交换树脂Ｄ３５４分离水中柠檬酸的相平衡和动力学。Ｌａｎｇｍｕｉｒ方程能够良好地关联等温线。建立了离子交换过程的孔扩散模型，并以正交配置法与Ｇｅａｒ法结合进行数据拟合。结果表明，液膜阻力对交换过程具有重大影响，简单线性推动力模型能够很好地描述液膜传质过程。

STUDY ON ION-EXCHANGE OF CITRIC ACID ON RESIN D354

The equilibrium and kinetics of citric acid separated by a weakly basic anionic exchange resin D354, were studied. The Langmuir's equation was suggested to simulate the isotherms.Models of pore diffusion were established' The combination of orthogonal collocation method and Gear's method was applied to correlate the experimental data. The results show that the film mass transfer resistance takes an important role in the ion-exchange processes. The film mass transfer processes can be described with the Linear Driving Force Model very well.