摘要
采用实验和模型计算两种方法研究了醋酸丁酯酯化反应体系组分在涂布法制备的用于渗透汽化分离的PEBA膜材料中的吸附行为。分别用Flory-Huggins和UNIQUAC模型预测了全浓度范围内的水/有机物二元混合液在PEBA膜中的吸附量。用溶解度参数法得到Flory-Huggins模型中的相互作用参数;用纯溶剂与膜的平衡吸附数据拟合得到UNIQUAC模型中溶剂与膜的二元相互作用参数,而溶剂之间的二元相互作用参数可用文献中汽液平衡数据关联拟合。结果表明PEBA膜材料的亲有机物性能良好,对于四种组分的选择吸附性顺序为:醋酸正丁酯>正丁醇>醋酸>水,并且两种模型的计算结果基本一致。
The sorption behaviors of esterification reaction components in poly(ether block amide) (PEBA) membrane were investigated by using experimental and model calculation methods. The PEBA membrane which usually can be used in pervaporation process was prepared by solvent casting method. The sorption amount of water/organic component of binary liquid mixtures over a wide concentration range in the PEBA membrane were calculated by using Flory-Huggins and UNIQUAC models, respectively. The interaction parameters of the Flory-Huggins model were determined by the solubility parameters method, and in the UNIQUAC model, the binary interaction parameters between the solvent and the membrane were obtained by data fitting of the equilibrium adsorption of the pure solvent with the membrane, and the binary interaction parameters between all pairs of esterification reaction components presented in the swollen PEBA membrane were obtained by fitting their vapor-liquid equilibrium data obtained from literatures. The results show that the PEBA exhibits to be a good hydrophobic material, and its preferential sorption selectivity for four studied components follows the sequence of n-butyl acetate 〉 n-butanol 〉 acetic acid 〉 water. For the same binary liquid mixture, the agreement of the sorption curves calculated separately by Flory-Huggins and UNIQUAC models is fairly good.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2009年第1期18-22,共5页
Journal of Chemical Engineering of Chinese Universities
基金
广西留学人员回国基金(0575002)
国家科技支撑项目(2007BAD75B05)