石油炼制与化工

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离子液体用于处理油田污水的初步研究

范洪富1,李凤华2,张翼3,王法高4   

  1. 1. 中国地质大学(北京)能源学院
    2. 大庆石油学院化学化工学院
    3. 中国石油勘探开发研究院采收率所
    4. 大庆油田有限责任公司采气分公司
  • 收稿日期:2009-11-04 修回日期:1900-01-01 出版日期:2010-06-12 发布日期:2010-06-12
  • 通讯作者: 李凤华

INITIAL RESEARCH ABOUT TREATMENT OF OILFIELD WASTEWATER WITH IONIC LIQUIDS

  • Received:2009-11-04 Revised:1900-01-01 Online:2010-06-12 Published:2010-06-12

摘要: 采用油浴法合成了3种疏水性咪唑类离子液体:[bmim]PF6,[hmimm]PF6, [omim]PF6。研究了这三种离子液体对油田污水的萃取效果,考察了萃取时间、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,当离子液体加量为2.0 mL、油田污水pH为3时,[bmim]PF6萃取效果较好;咪唑基团上烷基链长度对离子液体处理油田污水效果有较大影响,随着碳链的增长,离子液体的疏水性增强,π…π共轭效应也增强;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。

关键词: 油田污水, 去除率, 离子液体

Abstract: 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%.

Key words: oilfield waste water, removal rate, ionic liquids