离子交换树脂吸附乙酰丙酸的动力学研究

研究了大孔弱碱性树脂D310对乙酰丙酸的静态吸附动力学特征.采用批式离子交换法,考察了树脂粒径、溶液浓度、搅拌速率、温度对交换过程的影响,并用动边界模型对乙酰丙酸的离子交换过程进行了描述..结果表明,离子交换过程的控制步骤为颗粒扩散控制,搅拌速率和反应温度对交换速率无显著影响,吸附速率随乙酰丙酸初始浓度的增加而升高.交换过程的反应速率常数k0为0.8315,反应级数n为0.5313,表观活化能Ea为9.504kJ/mol,并得到了动力学总方程式.

STUDY ON THE KINETICS OF ADSORPTION OF LEVULINIC ACID BY ION-EXCHANGE RESIN

The adsorption behavior and mechanism of Levulinic acid (LA) with ion exchange technique were studied. Under optional reaction system, the influence on the ion exchange process including the granularities of resin,concentration of LA,Speeds of Stirring and temperature were investigated by batch ion-exchange method. Moving Boundary Model was applied to describe the kinetics of exchange process. The results show that the dominant procedure is ion diffusion through particles. The influence of stir speed and temperature on the adsorption r is little, the adsorption rate increases with the raise of primary consistency of LA. The rate constant of exchange (k0), order reaction (n) and the apparent activation energy reaction (Ea) were obtained: k0=0.8315, n=0.5313, Ea=9.504kJ/mol and the kinetics equation was obtained too.