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.