摘要
采用油浴法合成了3种疏水性咪唑类离子液体:[bmim]PF6,[hmim]PF6,[omim]PF6。研究这三种离子液体对油田污水的萃取效果,考察萃取时间、离子液体加量、pH值及咪唑基团上取代烷基链的长度对萃取效果的影响,同时对再生离子液体处理油田污水的效果进行研究。实验结果表明,萃取在20min时就可以达到平衡,当油田污水与离子液体的体积比为5、油田污水pH为3时,[bmim]PF6萃取效果较好;随着咪唑基团上烷基链长度的增加,离子液体的疏水性增强,π…π共轭效应也增强,从而具有更强的油田污水处理能力;再生离子液体[bmim]PF6处理油田污水后,污水COD的平均去除率在80%左右,离子液体的循环使用次数对污水的处理效果影响不大。
Three imidazole-based hydrophobic ionic liquids （[bmim]PF6, [hmim]PF6 and [omim]PF6） were synthesized using oil bath. The effects of extraction time, the amount of ionic liquids, pH value and the length of alkyl chain of the imidazole hydrophobic ionic liquids on the extraction of oilfield wastewater were investigated using these three ionic liquids. Test results showed that the extraction equilibrium could be reached within 20 min, good treating performance could be obtained at a wastewater to ionic liquid volume ratio of 5 and a wastewater pH value of 3 by using [bmim]PF6 ionic liquid. The treating performance was enhanced with the increase of the hydrophobic of the ionic liquid. [bmim]PF6 ionic liquid could be regenerated and reused for several times, the average COD removal rate of the regenerated ionic liquid was about 80%.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2010年第6期60-63,共4页
Petroleum Processing and Petrochemicals
基金
教育部科学技术研究重点项目(207032)
关键词
离子液体
油田污水
去除率
ionic liquids
oilfield wastewater
removal rate
