Reaction Model for the Fluorination of Uranium and Plutonium Compounds in Fluidized-Bed Reactors

Anastasia, L.J.; Alfredson, P.G.; Steindler, M. J.

doi:10.1021/i260038a002

Cited by 4 publications

(2 citation statements)

References 12 publications

(27 reference statements)

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“…Both sets of models have been applied successfully to a variety of reaction systems (see Anastasia et al, 1971; Costa and Smith, 1971;Hills, 1967;Hills, 1968;Mendoza et al, 1970;Rigg, 1970;Scrivner and Manning, 1970). They suffice if the density or conversion of the solid phase is to be found as a function of time.…”

Section: Scopementioning

confidence: 99%

Gasification: Part I. Isothermal, kinetic control model for a solid with a pore size distribution

Hashimoto

Silveston

1973

AIChE Journal

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A model describing the development of specific surface area, volume, porosity, and mean pore radius of a porous solid with extent of gasification is developed based on consideration of pore size growth, initiation of new pores, and coalescence of adjacent pores. Use of population balances and formulation of the properties as moments of the pore size distribution leads to a mathematically simple, closed set of equations for kinetically controlled gasification. The model successfully predicts maximums in specific surface area and number of pores observed by Kawahata and Walker (1962) in the activation of devolatilized anthracite by COz in a fluidized bed.

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Section: Scopementioning

confidence: 99%

Gasification: Part I. Isothermal, kinetic control model for a solid with a pore size distribution

Hashimoto

Silveston

1973

AIChE Journal

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“…U0 2 on a carrier of alumina is fluorinated to gaseous UFg in fluidized bed reactors operating at about 450°C [55]. This type of reaction may find use for the production of other kinds of valuable metals.…”

Section: Chlorination and Fluorination Of Metal Oxidesmentioning

confidence: 99%

Industrial Applications of Fluidized Beds

Kunii

1991

Fluidization Engineering

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Modeling of noncatalytic gas‐solid reactions

Ramachandran¹,

Doraiswamy²

1982

AIChE Journal

199

102

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This paper presents a critical review of the developments in the mathematical modeling of gas-solid noncatalytic reactions with particular emphasis on recent trends in the subject. A number of models proposed for analyzing this class of reactions have been reviewed with a fairly detailed discussion of the methods of incorporating structural changes which occur in the solid with the progress of reaction. The present status on the modeling of various types of complex gas-solid reactions is reviewed. Also the paper points out a number of areas in which future research may be needed. The review concludes with a critical discussion on the type of experimental data necessary for model verification and some comments on the choice of model for a given system. SCOPENoncatalytic gassolid reactions are encountered in a variety of chemical process industries. Tbe major applications are found in the fields of extractive metallurgy, control of gaseous pollutants, coal gasification processes, combustion of solid fuels, catalyst manufacture, etc. Tbe mathematical modeling of these systems is important in order to interpret laboratory data on these systems and in design and scaleup. The problem is complex since in addition to the interplay of heat and mass transfer, other considerations are necessary to account for the transient nature of the problem and the effects of changes in solid properties with the course of reaction. Some of the major developments in this area have been reviewed in a book by Szekely et .I. (1976) and in an edited monograph by Sohn and Wadsworth (1979) Since then considerable advances have taken place, and it is felt that there is a need for a comprehensive and critical review of the major recent developments in this area, and this review is written with this objective. Such a review also helps in evaluating some of the trends in research in this field. CONCLUSIONS AND SIGNIFICANCEIn this review the various models which are commonly used to describe gas-solid noncatalytic reactions have been discussed.The three common models which have been in use are the sharp interface model, the volume reaction model, and the particlepellet model. These models have been recently modified to take into account the effects of structural changes due to chemical reaction and sintering. AIso new models which take into account the basic porous nature of the solid and the pore size distribution have been proposed. The review covers all these major developments. Further, in each case the model parameters and their physical significance have been clearly indicated.Another important area of research is in the field of complex gas-solid noncatalytic reactions. A classification of the important reactions belonging to this class has been presented and the major developments in tbe modeling of these have been pointed out. The review also covers special characteristics of gasification and decomposition reactions and reactions showing significant nucleation effects. The information on the stability of noncatalytic gas-solid reactions ...

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Reaction Model for the Fluorination of Uranium and Plutonium Compounds in Fluidized-Bed Reactors

Cited by 4 publications

References 12 publications

Gasification: Part I. Isothermal, kinetic control model for a solid with a pore size distribution

Gasification: Part I. Isothermal, kinetic control model for a solid with a pore size distribution

Industrial Applications of Fluidized Beds

Modeling of noncatalytic gas‐solid reactions

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