摘要
测定了苯酚、苯基酚、苯二酚等几种不同取代基的酚类物质在疏水性离子液体[bmim]PF6(1-丁基-3-甲基咪唑六氟磷酸盐)和[dmim]PF6(1-癸基-3-甲基咪唑六氟磷酸盐)与水两相中的分配系数. 实验结果表明,萃取过程很快可以达到平衡. 与传统有机溶剂相比,分配系数处在同一个数量级. 分配系数随温度升高而降低,离子液体对不同取代基的酚类萃取能力有很大差异,咪唑基团上取代烷基链的长度对不同酚类物质的分配系数有很大影响,因此可以通过调节离子液体结构使其适用于不同成分的含酚废水.
Hydrophobic ionic liquids, 1-butyl-3-methylimidazolium hexfluorophosphate ([bmim]PF6) and 1-decatyl-3-methylimid- azolium hexfluorophosphate ([dmim]PF6), were used for extracting phenols from aqueous solutions. The distribution coefficients of phenols between water and ionic liquids were determined. The results showed that the distribution coefficients of phenols between water and ionic liquids were on the same order as that between water and conventional organic solvents, and the extraction efficiency was dependent on temperature and the length of alkyl chain on the imidazole of ionic liquids. Ionic liquids show the potential to replace organic solvents for extracting phenols from wastewater, due to its unique characteristics.
出处
《过程工程学报》
EI
CAS
CSCD
北大核心
2005年第2期148-151,共4页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:20276073)
关键词
离子液体
酚
萃取
分配系数
ionic liquid
phenol
extraction
partition coefficient
