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Batch and continuous nitration of toluene and chlorobenzene with acetyl nitrate over zeolite beta

Paper ID Volume ID Publish Year Pages File Format Full-Text
43359 45966 2007 6 PDF Available
Title
Batch and continuous nitration of toluene and chlorobenzene with acetyl nitrate over zeolite beta
Abstract

Zeolite beta allows high yields and good selectivity in the batch nitration of toluene and chlorobenzene with acetyl nitrate. Deactivation of the HPB1 zeolite beta catalyst takes place due to dealumination and the adsorption of acetic acid and acetic acid anhydride, which causes a decrease of the selectivity to 4-nitrotoluene in the nitration of toluene. Active reaction centres for the nitration are protonated aluminium centres in the zeolite framework, but not free aluminium species inside the reaction mixture. Nitrate or counter ions like sodium are not involved in the reaction mechanism. In the continuous liquid-phase nitration with acetyl nitrate, the zeolite beta catalyst enhanced the conversion of toluene only slightly, compared to the non-catalysed homogeneous reaction. With the less reactive substrate chlorobenzene, however, zeolite beta acted as an efficient catalyst in the continuous nitration with acetyl nitrate.

Graphical abstractThe nitration of toluene and chlorobenzene with acetyl nitrate is a very fast reaction that can be run in a continuous reaction setup with zeolite beta catalyst. Deactivation of the catalyst takes place due to dealumination and the adsorption of acetic acid and acetic acid anhydride. Active reaction centres for the nitration are protonated aluminium centres in the zeolite framework, but not free aluminium species inside the reaction mixture. Nitrate or counter ions like sodium are not involved in the reaction mechanism.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Nitration; Acetyl nitrate; Zeolite beta; Continuous; Batch; Toluene; Chlorobenzene
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Batch and continuous nitration of toluene and chlorobenzene with acetyl nitrate over zeolite beta
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 333, Issue 1, 3 December 2007, Pages 24–29
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