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A study on the liquid-phase oxidation of toluene in ionic liquids

Paper ID Volume ID Publish Year Pages File Format Full-Text
40639 45861 2012 7 PDF Available
Title
A study on the liquid-phase oxidation of toluene in ionic liquids
Abstract

The effect and mechanism of the hydrophilic ionic liquids (ILs) with cobalt naphthenate as catalyst on the liquid-phase oxidation of toluene were studied systematically. Five ILs with different hydrophilicities were employed as reaction media. The results showed that toluene conversion increased with increasing hydrophilicity of ILs. The toluene conversion and the corresponding selectivity of benzaldehyde reached 19.6% and 19.5%, respectively, in 1-ethyl-3-methylimidazolium tetrafluoroborate ([Emim]BF4). The solubilities of toluene, benzaldehyde, benzyl alcohol and benzoic acid in [Emim]BF4 were further measured at temperatures from 299.2 K to 343.2 K. The correlations between solubility and temperature were developed based on the critical point of phase separation or ideal solution model. The low solubility of toluene in [Emim]BF4 indicated a heterogeneous oxidation mechanism for toluene. The improvement of toluene conversion and product selectivity in [Emim]BF4 was attributed to the interactions between reaction and extraction separation. The sensitivity study demonstrated that the increase in oxygen pressure was beneficial to the reaction. A much lower reaction temperature of 130 °C was achieved in [Emim]BF4 instead of a typical 160–170 °C for current commercial plants. The high conversion, low reaction temperature and high product selectivity for the liquid-phase oxidation of toluene in [Emim]BF4 makes it a green and efficient hydrocarbon oxidation process.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (129 K)Download as PowerPoint slideHighlights► Toluene conversion increased with the increasing hydrophilicity of ILs. ► [Emim]BF4 improved the reaction with a high conversion and high selectivities. ► The process in [Emim]BF4 was controlled by a heterogeneous L-L-G reaction. ► Coupling between reaction and extraction separation improved the process.

Keywords
Ionic liquids; Liquid-phase oxidation; Solubility; Toluene; Benzaldehyde; Benzyl alcohol; Benzoic acid
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A study on the liquid-phase oxidation of toluene in ionic liquids
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 439–440, 10 October 2012, Pages 1–7
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us