Johnson, M, Heggs, P and Mahmud, T (2016) Assessment of overall heat transfer coefficient models to predict the performance of laboratory-scale jacketed batch reactors. Organic Process Research & Development, 20 (2). pp. 204-214. ISSN 1083-6160
Abstract
Heat transfer models for agitated, jacketed, laboratory-scale batch reactors are required to predict process temperature profiles with great accuracy for tasks associated with chemical process development such as batch crystallization and chemical reaction kinetics modeling. The standard approach uses a reduced model which assumes the system can be adequately represented by a single overall heat transfer coefficient which is independent of time; however, the performance of reduced models for predicting the evolution of process temperature is rarely discussed. Laboratory scale (0.5 and 5 L) experiments were conducted using a Huber thermoregulator to deliver a thermal fluid at constant flow to a heat transfer jacket. It is demonstrated that the relative specific heat contribution of the reactor and inserts represent an increasing obstacle for these transient models with decreasing scale. However, a series of experiments implied that thermal losses were the limiting factor in the performance of a single coefficient reduced model at laboratory-scale. A diabatic model is presented which accounts for both thermal losses and the thermal inertia of the reactor vessel and inserts by incorporating a second coefficient and a modified heat capacity term. The mean absolute error in predicted process temperature was thereby reduced by a factor of 8, from 2.4 to 0.3 K, over a 150 min experiment.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2016, American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Organic Process Research & Development, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/acs.oprd.5b00378. |
Keywords: | Heat Transfer, Overall Heat Transfer Coefficienr, Agitated vessel |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) > Institute for Particle Science and Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 04 Mar 2016 11:54 |
Last Modified: | 14 Apr 2017 03:36 |
Published Version: | http://dx.doi.org/10.1021/acs.oprd.5b00378 |
Status: | Published |
Publisher: | American Chemical Scociety |
Identification Number: | 10.1021/acs.oprd.5b00378 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:95588 |