Denbigh

Denbigh, K. G., and Turner, J. C. R., Chemical Reactor Theory, 3d ed., Cambridge University Press, Cambridge, England, 1984. 

Denbigh K 1981 Prinoiples of Chemioal Equilibrium 4th edn (London Cambridge University Press)... 

Denbigh and Turner, Chemical Reactor Theory, Cambridge, 1971. 

A factor in addition to the RTD and temperature distribution that affects the molecular weight distribution (MWD) is the nature of the chemical reaciion. If the period during which the molecule is growing is short compared with the residence time in the reactor, the MWD in a batch reactor is broader than in a CSTR. This situation holds for many free radical and ionic polymerization processes where the reaction intermediates are very short hved. In cases where the growth period is the same as the residence time in the reactor, the MWD is narrower in batch than in CSTR. Polymerizations that have no termination step—for instance, polycondensations—are of this type. This topic is treated by Denbigh (J. Applied Chem., 1, 227 [1951]). 

Denbigh, K., The Principles of Chemical Equilibrium, Cambridge University Press (1971) Avery, H. E. and Shaw, D. J., Basic Physical Chemistry Calculations, Butterworths (1971) Gross, J. M. and Wiseall, B., Principles of Physical Chemistry, Macdonald and Evans (1972) Kubaschewski, O., Evans, E. LI. and Alcock, C. B., Metallurgical Thermochemistry, 4th edition, Pergamon Press (1967)... 

Brent International PLC Denbigh West, Bletchley Milton Keynes MK1 1PB... 

Denbigh, K. G., Thermodynamics of the Steady State, Methuen, London, 1951. Glansdorff, P., and I. Prigogine, Structure, Stability and Fluctuations, John Wiley Sons, New York, 1971. 

Denbigh and Prince (4) have studied the kinetics of the absorption of gaseous N02 in aqueous nitric acid solutions. The following stoichiometric relation governs the process. 

On the basis of their experimental studies and a search of the literature, Denbigh and Prince indicated that the correct choice of n is 1/2. They found that the data could be fitted by an expression of the form... 

Often the decision to select a batch or continuous processing mode involves a determination of the relative contributions of capital and operating expenses to total process costs for the proposed level of capacity. As Denbigh (1) points out, what is best for a highly industrialized country with high labor costs is not necessarily best for a lesser developed country. In many cases selectivity considerations determine the processing mode, particularly when the reaction under study is accompanied by undesirable side reactions. The yield of the desired product may differ considerably between batch and continuous operation and between the two primary types of continuous processes. When the yield is lower for a continuous process, this factor may be so important in the... 

It is possible to extend this treatment to the case of multiple CSTR s operating in series by adapting the procedure outlined by Denbigh and Turner (2). Let (ACA)U (ACA)2, and (ACA)h represent the changes in the concentration of species A that take place in tanks one, two, and i, respectively. 

Molecular weight distribution function for the case where the length of the growth stage is short compared to the residence time in reactor. (Reprinted with permission from Chemical Reactor Theory, by K. G. Denbigh and J. C. R. Turner. Copyright 1971 by Cambridge University Press.)... 

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