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Laboratory set-up to pilot plant investigations on vapour phase ammoxidation of 2,6-dichlorotoluene

Paper ID Volume ID Publish Year Pages File Format Full-Text
42813 45942 2008 8 PDF Available
Title
Laboratory set-up to pilot plant investigations on vapour phase ammoxidation of 2,6-dichlorotoluene
Abstract

The scaling-up of the gas phase catalytic ammoxidation of 2,6-dichlorotoluene (DCT) to 2,6-dichlorobenzonitrile (DCBN) over vanadium phosphate catalyst in a pilot plant was investigated. The focus was led on the process variables that might be critical for designing a commercial manufacturing unit, in particular on evaluation of reaction temperature that may cause hot spots, temperature gradients, etc. Furthermore, catalyst scale-up, catalyst stability and a development of a product separation section particularly for the solid reaction products was studied. The up-scaling of the process using 100 ml of catalyst was investigated both by reactor simulations and catalytic experiments. For reactor simulations, a pseudo-homogeneous model of a fixed bed tubular reactor with negligible axial and radial diffusion operating in the steady-state was applied. The kinetic model based upon the Langmuir–Hinshelwood mechanism was used. The results showed that the temperature control will be crucial in scaling-up of the process. The influence of the reactor geometry, reactor operating conditions and catalyst stability on the reactor performance is discussed. The possibility of an appearance of hot spots in the reactor is addressed. High selectivity of DCBN (85%) can be achieved for an extended period of time. A good agreement between experimental and simulation results is observed.

Graphical abstractThe scaling-up of the gas phase catalytic ammoxidation of 2,6-dichlorotoluene (DCT) to 2,6-dichlorobenzonitrile (DCBN) over VPO catalysts in a pilot plant was investigated. The focus was led on the process variables that might be critical to the design of a commercial manufacturing facility. Furthermore, catalyst scale-up, catalyst stability and a development of a product separation section particularly for the solid reaction products was studied.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Scale-up; Pilot plant experiments; Reactor simulation; VPO catalyst; Ammoxidation; 2,6-Dichlorotoluene; 2,6-Dichlorobenzonitrile; Temperature profile
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 349, Issues 1–2, 31 October 2008, Pages 125–132
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