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Reaction scheme of o-xylene oxidation on vanadia catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
41591 45894 2011 7 PDF Available
Title
Reaction scheme of o-xylene oxidation on vanadia catalyst
Abstract

The oxidation of o-xylene (OX) to phthalic anhydride (PA) is one of the important industrial processes based on selective oxidation reactions. However, the fundamental understanding of the by-product formation is still an open task. By using a sample port pilot plant, a detailed investigation was conducted for the first time of the by-product formation at different operation conditions. Several hitherto unknown intermediates could unambiguously be identified. The combination of process conditions and by-product formation enables the discussion of a new improved reaction scheme for the catalytic oxidation of o-xylene.The reaction path from OX to PA is commonly described by a rake mechanism consisting of a number of parallel and serial reactions. Tolualdehyde and phthalide are seen as the main intermediates. The most important by-products are maleic anhydride (MA), CO and CO2. The reaction paths towards these by-products are widely unknown.Several gas phase components, such as toluquinone and 2,3-dimethyl-p-benzoquinone not reported yet in the current literature, were observed for the first time in this study. Most of these previously unknown components are reaction intermediates, which later do not form the desired reaction product, PA.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (219 K)Download as PowerPoint slideHighlights► Novel reaction scheme for o-xylene oxidation. ► Identification of several previously unknown intermediates. ► Comparison of pilot plant data to the industrial process. ► Determination of intermediate selectivities.

Keywords
Phthalic anhydride; Vanadia; Partial oxidation; Mechanism; Kinetics
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 398, Issues 1–2, 15 May 2011, Pages 37–43
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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