三氯蔗糖在大孔吸附树脂SP825上的吸附热动力学

摘要

The adsorption thermodynamics and kinetics of sucralose on macroporous resin SP825 were systematically studied by a static method. It provided the fundamental data used in the following recovery process design. The results showed that the saturated capacities of resin SP825 were 0. 146, 0. 151 and 0. 156 g per gram resin at the temperatures of 283. 15 ,293. 15 and 303. 15 K, respectively. Lang-muir isotherm model fitted the experimental data well. The adsorption process belonged to the physical adsorption and underwent spontaneously. The pseudo second-order kinetic models were used to describe the adsorption process of sucralose on resin SP825. Simulation results indicated that the adsorption rate of sucralose was probably affected by the internal molecular diffusion process under experimental conditions.%采用静态吸附法,系统研究了三氯蔗糖在大孔吸附树脂SP825上的吸附热力学和动力学特性,为后续三氯蔗糖提取工艺的设计提供基础数据.实验结果表明:在283.15、293.15和303.15 K温度下,树脂SP825对三氯蔗糖的最大吸附量(每克湿树脂)分别为0.146、0.151和0.156 g.树脂SP825对三氯蔗糖的吸附平衡数据符合Langmuir吸附等温方程,吸附过程为自发的物理吸附过程;并运用准二阶动力学模型描述了动力学过程,确定在实验条件范围内,吸附受颗粒内部传质速率的影响.