一元羧酸结构参数对两种硅橡胶膜渗透萃取的影响研究

Effects of monocarboxylic acids structure parameters on perstraction with two kinds of silicone rubber membrane

摘要:

论文研究了甲基硅橡胶膜（PDMS）和乙烯基硅橡胶膜(PVMS)对一元羧酸的渗透萃取效果，建立了有机物结构参数与膜渗透萃取效果的关系。研究发现，PVMS膜比PDMS膜对一元羧酸有较好的萃取效果。结合一元羧酸结构参数与硅橡胶膜结构，对渗透萃取效果进行分析。结果表明：对于硅橡胶膜，随着有机物辛醇-水分配系数(Kow或P)、分子摩尔体积（Vm）、分子极化率（a）的增大，固有溶解度（S）的减小，一元羧酸的萃取率依次升高；经线性回归拟合分析，辛醇-水分配系数(Kow或P)与硅橡胶膜萃取率有良好的相关性（R2均在0.96以上）；分子摩尔体积（Vm）对硅橡胶膜萃取率表现出一定的相关性（R2均在0.81以上）；偶极矩（u）并未有表现出明显的规律性。

Abstract:

The pertraction effect of monocarboxylic acids by methyl silicone rubber (PDMS) and vinyl silicone rubber membrane (PVMS) were investigated. Relations between the organic structure parameters and pertraction effect were founded. The pertraction experiment demonstrated that PVMS membrane have good extraction effect on formic acid and acetic acid compared with PDMS membrane. The pertraction effect of monocarboxylic acids were analyzed by organic structure parameters and silicone rubber membrane structure. Results showed that with the increase of octanol-water partition coefficient (Kow or P), molecular molar volume (Vm) and molecular polarizability (a) that extraction rate of monocarboxylic acids increased; however, extraction rate decreased with the increase of mass intrinsic solubility(S). Pertraction experiments showed a significant correlation between extraction rate and log P(Ｒ2 was more than 0.96), as well as a correlation between extraction rate and Vm (Ｒ2 was more than 0.81). Dipole moment (u) does not have apparent regularity in this study.