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该文考察了甲基硅橡胶膜(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比PDMS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(V_m)、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(R~2均在0.960以上);分子摩尔体积(V_m)对硅橡胶膜萃取率表现出一定的相关性(R~2均在0.810以上);偶极矩(μ)并未表现出明显的规律性。
In this paper, the effects of methyl silicone rubber (PDMS) and vinyl silicone rubber (PVMS) on the extraction of monocarboxylic acids were investigated. The relationship between the structure parameters of organic compounds and the membrane extraction efficiency was established. The study found that, PVMS than PDMS monocarboxylic acid has better extraction results. Combined with the structure parameters of monocarboxylic acid and the structure of silicone rubber membrane, the effect of osmotic extraction was analyzed. The results showed that with the increase of the organic fraction (Kow or P), the molecular molar volume (Vm), the molecular polarizability (a) and the decrease of the intrinsic solubility (S) The extraction rate of monocarboxylic acids increased in turn; after fitting analysis, octanol-water partition coefficient (Kow or P) had good correlation with the extraction rate of silicone rubber membrane (R ~ 2 was above 0.960); the molecular molar volume (V_m) showed a certain correlation with the extraction rate of silicone rubber membrane (R ~ 2 were above 0.810). Dipole moment (μ) did not show obvious regularity.