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2008•Acta Petrolei Sinica(Petroleum Processing Section)Requires access

tert-BUTYLATION OF HYDROQUINONE OVER tri-METHYLAMMONIUM-BASED SO_3H-FUNCTIONALIZED IONIC LIQUID

Guo Xinwen

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Abstract

The tri-methylammonium-based SO3H-functionalized ionic liquids were synthesized by using tri-methylamine and 1,4-butanesultone or 1,3-propanesultone as the source,and characterized by NMR,TOF-MS and TG.Their catalytic properties in the alkylation of hydroquinone(HQ)with tert-butyl alcohol(TBA)were also investigated.The influences of reaction time,molar ratio of TBA to HQ,molar ratio of ionic liquids to HQ,reaction temperature,and the recycle times of ionic liquid on the catalytic properties in the tert-butylation of hydroquinone were studied.Under optimum reaction conditions of T=343 K,t=90 min,n(HQ)∶n(TBA)∶n(IL)=2∶3∶1,the conversion of HQ and the selectivity to 2-tert-butyl-hydroquinone(TBHQ)were 68.4% and 75.1%,respectively.No apparent loss of activity and selectivity of the ionic liquid were observed after six recycles.

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What this paper is about

The tri-methylammonium-based SO3H-functionalized ionic liquids were synthesized by using tri-methylamine and 1,4-butanesultone or 1,3-propanesultone as the source,and characterized by NMR,TOF-MS and TG.Their catalytic properties in the alkylation of hydroquinone(HQ)with tert-butyl alcohol(TBA)were also investigated.The influences of reaction time,molar ratio of TBA to HQ,molar ratio of ionic liquids to HQ,reaction temperature,and the recycle times of ionic liquid on the catalytic properties in the tert-butylation of hydroquinone were studied.Under optimum reaction conditions of T=343 K,t=90 min,n(HQ)∶n(TBA)∶n(IL)=2∶3∶1,the conversion of HQ and the selectivity to 2-tert-butyl-hydroquinone(TBHQ)were 68.4% and 75.1%,respectively.No apparent loss of activity and selectivity of the ionic liquid were observed after six recycles.

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Available abstract

The tri-methylammonium-based SO3H-functionalized ionic liquids were synthesized by using tri-methylamine and 1,4-butanesultone or 1,3-propanesultone as the source,and characterized by NMR,TOF-MS and TG.Their catalytic properties in the alkylation of hydroquinone(HQ)with tert-butyl alcohol(TBA)were also investigated.The influences of reaction time,molar ratio of TBA to HQ,molar ratio of ionic liquids to HQ,reaction temperature,and the recycle times of ionic liquid on the catalytic properties in the tert-butylation of hydroquinone were studied.Under optimum reaction conditions of T=343 K,t=90 min,n(HQ)∶n(TBA)∶n(IL)=2∶3∶1,the conversion of HQ and the selectivity to 2-tert-butyl-hydroquinone(TBHQ)were 68.4% and 75.1%,respectively.No apparent loss of activity and selectivity of the ionic liquid were observed after six recycles.

Key concepts: Hydroquinone, Ionic liquid, Chemistry, Selectivity, Catalysis, Methylamine, Alkylation, Molar ratio

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tert-BUTYLATION OF HYDROQUINONE OVER tri-METHYLAMMONIUM-BASED SO_3H-FUNCTIONALIZED IONIC LIQUID — Research Paper | ScholarLens