Three different types of heterocycle of nitrogen-containing alkaline ionicliquids treatment of acid oil to remove naphthenic acids

Catalysis Today, Available online 18 September 2012, In Press, Corrected Proof
Three different types of heterocycle of nitrogen-containing alkaline ionicliquids treatment of acid oil to remove naphthenic acids
Jiyun Duan, Yu Sun, Li Shi
The State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, PR China
Abstract
Ionic liquids show great potential for industrial use as environmental friendly chemicals.  Authors describe an effective green deacidification method based on ionic liquids.
They used n-alkylpyridinium bromide ([APy]Br), 1-alkyl-3-methylimidazolium bromide ([AMIm]Br) and 1-alkyl-3-methylimidazolium imidazolide ([AMIm]Im) to remove naphthenic acids from acid oil. The performance of deacidification followed the order [APy]Br < [AMIm]Br < [AMIm]Im.  Ionic liquids with stronger alkalinity produced higher deacidification rates.  The growth of alkyl chain length also helped achieve high deacidification. The deacidification mechanism is explained by the fact that liquid clathrate could form due to interaction between the ionic liquids and π-bond in naphthenic acids through π–π interaction. When the reagent/oil ratio of [OMIm]Im (1-octyl-3-methylimidazolium imidazolide)/oil was 0.008, the deacidification rate of 100% could be reached.
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