硝基苯甲酸结构对其在EPDM膜中萃取效果的影响

以3种取代基位置不同的硝基苯甲酸为研究对象,研究了辛醇/水分配系数、溶解度、摩尔体积、分子极化率和偶极矩5种结构参数对硝基苯甲酸在三元乙丙橡胶（EPDM）膜中萃取效果的影响。实验结果表明：EPDM膜对硝基苯甲酸有一定的去除效果,邻、间、对硝基苯甲酸的去除率分别为27.1%、32.4%和41.6%;取代基位置的不同使硝基苯甲酸的去除效果出现差异,其疏水性越强越易在EPDM膜中溶解和渗透;硝基苯甲酸的去除率和透过率与其辛醇/水分配系数和分子极化率正相关,与溶解度负相关;硝基苯甲酸的去除率可用分子极化率和偶极矩两个结构参数进行预测。

Effect of structure of nitrobenzoic acid on its extraction in ethylene propylene diene monomer membrane

Using 3 kinds of nitrobenzoic acid with different substituent positions as research object,the effects of structure parameters,such as octanol/water partition coefficient,solubility,molar volume,molecular polarizability and dipole moment,on extraction of nitrobenzoic acid in ethylene propylene diene monomer（EPDM）membrane were studied. The experimental results show that：EPDM membrane has some effect on nitrobenzoic acid removal,the removal rate of o-,m-,p-nitrobenzoic acid is 27.1%,32.4% and 41.6%,respectively;The difference of substituent position causes the difference of nitrobenzoic acid removal effect,the stronger the hydrophobicity of nitrobenzoic acid is,the easier it can dissolve and penetrate in the EPDM membrane;The removal rate and transmission rate of nitrobenzoic acid are positively correlate to the octanol/water partition coefficient and molecular polarizability,while negatively correlate to its solubility;The removal rate of nitrobenzoic acid can be predicted by molecular polarizability and dipole moment.