The combination of 1-octyl-3-methylimidazolium tetrafluorborate with TBAB or THF on CO2 hydrate formation and CH4 separation from biogas

doi:10.1016/j.cjche.2018.03.014

Chinese Journal of Chemical Engineering ›› 2018, Vol. 26 ›› Issue (12): 2495-2502.DOI: 10.1016/j.cjche.2018.03.014

• Separation Science and Engineering • 上一篇下一篇

The combination of 1-octyl-3-methylimidazolium tetrafluorborate with TBAB or THF on CO₂ hydrate formation and CH₄ separation from biogas

Gang Yue^1,2, Aixian Liu^1,3, Qiang Sun^1,2, Xingxun Li^1,2, Wenjie Lan^1,2, Lanying Yang^1,2, Xuqiang Guo^1,3

1 State Key laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;
2 China University of Petroleum-Beijing, Beijing 102249, China;
3 China University of Petroleum-Beijing At Karamay, Xinjiang 834000, China

收稿日期:2017-12-09 修回日期:2018-02-24 出版日期:2018-12-28 发布日期:2019-01-09
通讯作者: Xuqiang Guo

The combination of 1-octyl-3-methylimidazolium tetrafluorborate with TBAB or THF on CO₂ hydrate formation and CH₄ separation from biogas

Gang Yue^1,2, Aixian Liu^1,3, Qiang Sun^1,2, Xingxun Li^1,2, Wenjie Lan^1,2, Lanying Yang^1,2, Xuqiang Guo^1,3

1 State Key laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;
2 China University of Petroleum-Beijing, Beijing 102249, China;
3 China University of Petroleum-Beijing At Karamay, Xinjiang 834000, China

Received:2017-12-09 Revised:2018-02-24 Online:2018-12-28 Published:2019-01-09
Contact: Xuqiang Guo

摘要/Abstract

摘要： [C₈min] BF₄ was used in this work to combine with TBAB or THF for the investigation about thermodynamic and kinetic additives on CO₂ and CH₄/CO₂ hydrates. The results show that[C₈min] BF₄ has the inhibition effect on the equilibrium of hydrate formation. About the kinetic study,[C₈min] BF₄ could improve the rate of CO₂ hydrate formation and increase the gas uptake in hydrate phase. At the same time, the combination of TBAB and[C₈min] BF₄ could increase the mole friction of CH₄ in residual gas comparing with the data in THF solution. CH₄ separation efficiency was strongly enhanced. Since that the size of CO₂ and CH₄ molecules are similar, CH₄ and CO₂ could form the similar hydrate, so the recovery of CH₄ from biogas decreases lightly. The CH₄ content in biogas can purified from 67 mol% to 77 mol% after one-stage hydrate formation. In addition, the combination of THF and[C₈min] BF₄ do not have obvious promoting effect on CH₄ separation comparing with the gas separation results in pure THF solution.

关键词: Biogas, Gas separation, Hydrate, Ionic liquid

Abstract: [C₈min] BF₄ was used in this work to combine with TBAB or THF for the investigation about thermodynamic and kinetic additives on CO₂ and CH₄/CO₂ hydrates. The results show that[C₈min] BF₄ has the inhibition effect on the equilibrium of hydrate formation. About the kinetic study,[C₈min] BF₄ could improve the rate of CO₂ hydrate formation and increase the gas uptake in hydrate phase. At the same time, the combination of TBAB and[C₈min] BF₄ could increase the mole friction of CH₄ in residual gas comparing with the data in THF solution. CH₄ separation efficiency was strongly enhanced. Since that the size of CO₂ and CH₄ molecules are similar, CH₄ and CO₂ could form the similar hydrate, so the recovery of CH₄ from biogas decreases lightly. The CH₄ content in biogas can purified from 67 mol% to 77 mol% after one-stage hydrate formation. In addition, the combination of THF and[C₈min] BF₄ do not have obvious promoting effect on CH₄ separation comparing with the gas separation results in pure THF solution.

Key words: Biogas, Gas separation, Hydrate, Ionic liquid

Gang Yue, Aixian Liu, Qiang Sun, Xingxun Li, Wenjie Lan, Lanying Yang, Xuqiang Guo. The combination of 1-octyl-3-methylimidazolium tetrafluorborate with TBAB or THF on CO₂ hydrate formation and CH₄ separation from biogas[J]. Chinese Journal of Chemical Engineering, 2018, 26(12): 2495-2502.

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The combination of 1-octyl-3-methylimidazolium tetrafluorborate with TBAB or THF on CO₂ hydrate formation and CH₄ separation from biogas

The combination of 1-octyl-3-methylimidazolium tetrafluorborate with TBAB or THF on CO₂ hydrate formation and CH₄ separation from biogas

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