离子交换树脂法回收水中离子液体

发布时间：2018-05-28 16:05

本文选题：离子液体 + 离子交换　；参考：《化工进展》2017年04期

【摘要】：目前离子液体辅助油砂萃取工艺中直接蒸馏回收离子液体的能耗较大。为了降低能耗、节约操作成本,本文提出了先用离子交换树脂对离子液体溶液进行离子交换预处理以降低水含量,然后进行蒸馏的方法。采用离子交换树脂AMBERJET 1200Na对模拟水洗所得的离子液体溶液进行处理,以回收其中的离子液体[EMim]BF_4,通过调整吸、脱附工艺参数得到了最佳工艺条件,并深入分析了吸附机理。采用上述最佳条件,对真实油砂矿水洗得离子液体溶液进行了回收,进一步验证并完善了工艺条件。得出当水洗的离子液体溶液体积为150m L、浓度为10 g/L、树脂用量为5g、吸附温度为293K、吸附时间为15min时吸附率达97%以上;当脱附温度为333K、盐酸脱附剂质量分数为15%时脱附率达93%以上;经蒸馏,[EMim]~+回收率达91%以上。研究结果还表明:本工艺具有较好的节能效果,与直接蒸馏相比,能耗降低45%以上。
[Abstract]:At present, the energy consumption of direct distillation and recovery of ionic liquids in the extraction process of oil sand assisted by ionic liquids is large. In order to reduce energy consumption and save operation cost, a method of ion exchange pretreatment of ionic liquid solution with ion-exchange resin to reduce water content and distillation was put forward in this paper. Ion exchange resin (AMBERJET 1200Na) was used to treat the ionic liquid solution from simulated water washing to recover the ionic liquid [EMim] BF _ 4. The optimum process conditions were obtained by adjusting the adsorption and desorption process parameters, and the adsorption mechanism was analyzed in depth. The above optimum conditions were used to recover the ionic liquid solution from real oil sands washed by water, and the technological conditions were further verified and improved. The results show that when the volume of water washed ionic liquid solution is 150 mL, the concentration is 10 g / L, the amount of resin is 5 g, the adsorption temperature is 293K, the adsorption time is 15min, the adsorption rate is over 97%, when the desorption temperature is 333K, the mass fraction of hydrochloric acid desorption agent is 15, the desorption rate is more than 93%. After distillation, the recovery of [EMim] ~ was over 91%. The results also show that the process has a better energy saving effect, compared with direct distillation, the energy consumption is reduced by more than 45%.
【作者单位】：天津大学化工学院;精馏技术国家工程研究中心;天津化学化工协同创新中心;
【基金】：国家自然科学基金项目(41471258)
【分类号】：TQ028.33

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