摘要
采用填充柱的反相气相色谱方法 ,基于Hadj-Romdhane -Danner色谱过程的数学模型 ,在 3 2 3 .2～ 3 63 .2K温度范围内测定了环己烷在聚异丁烯和聚乙烯膜中的无限稀释扩散系数 .从实验数据可以看出 ,环己烷更容易在PIB中发生扩散 .对实测扩散数据进行了自由体积理论关联 ,结果表明 ,采用空穴自由体积替代Vrentas
Based on the Hadj-Romdhane-Danner mathematical model of the chromatographic process, the infinite dilution diffusion coefficients of cyclohexane in polyethylene (PE) and polyisobutylene (PIB) were measured in the temperature range between 323.2 and 363.2K by reverse gas chromatography. The experimental data show that the diffusion data of cyclohexane in PE are smaller than those in PIB at the same temperature,which indicates that the diffusion of cyclohexane in PE membrane is more difficult if compared with PIB membrane. The correlation of the experimental data was performed by using the modified Vrentas-Duda free-volume equation, where the hole free volume was introduced instead of the whole free volume in the Vrentas-Duda initial equation. The correlated results show that the modified equation is a quite good description of the relationship between the observed diffusion data and the temperature.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2001年第1期34-38,共5页
Acta Chimica Sinica
基金
国家自然科学重点基金 ( 2 9736170 )资助项目
