Investigation of Hydrogenation of Toluene to Methylcyclohexane in a Trickle Bed Reactor by Low-Field Nuclear Magnetic Resonance Spectroscopy

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Abstract:

Low-field nuclear magnetic resonance (NMR) spectroscopy is applied to study the hydrogenation of toluene in a lab-scale reactor. A conventional benchtop NMR system was modified to achieve chemical shift resolution. After an off-line validity check of the approach, the reaction product is analyzed on-line during the process, applying chemometric data processing. The conversion of toluene to methylcyclohexane is compared with off-line gas chromatographic analysis. Both classic analytical and chemometric data processing was applied. As the results, which are obtained within a few tens of seconds, are equivalent within the experimental accuracy of both methods, low-field NMR spectroscopy was shown to provide an analytical tool for reaction characterization and immediate feedback.

Keywords: CHEMOMETRICS; HYDROGENATION; LOW-FIELD NMR SPECTROSCOPY; NUCLEAR MAGNETIC RESONANCE; ON-LINE NMR; TOLUENE

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370209789553156

Affiliations: 1: SRG10-2, Institute for Mechanical Process Engineering and Mechanics, Universität Karlsruhe (TH), 76128 Karlsruhe, Germany 2: Engler-Bunte-Institute, Division of Fuel Chemistry and Technology, Universität Karlsruhe (TH), 76128 Karlsruhe, Germany

Publication date: October 1, 2009

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