Successive gas-solid reactions in a porous pellet: Application to the reaction of metal sulfides in the presence of lime

Sohn, Hong Yong; Rajamani, K.

doi:10.1016/0009-2509(77)80148-6

Cited by 25 publications

(11 citation statements)

References 15 publications

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“…The first is the hydrogen reduction of metal sulfides in the presence of lime (Kay, 1968;Habashi and Yostos, 1977;Sohn and Rajamani, 1977;Shah and Ruzzi, 1978;Rajamani and Sohn, 1983;Sohn and Won, 1985;Won and Sohn, 1985), which can be represented by the following general scheme: In this reaction scheme, lime serves two purposes: (1) it fixes sulfur in the solid, thereby reducing the emission of hydrogen sulfide into the atmosphere, and (2) the presence of lime improves the otherwise unfavorable thermodynamics of reaction 7.116a by removing hydrogen sulfide from the gas phase. Reaction 7.116b is highly favorable thermodynamically.…”

Section: Solid±solid Reactions Proceeding Through Gaseous Intermediatmentioning

confidence: 99%

“…The second example is the roasting of sulfide minerals in the presence of lime (Haver and Wong, 1972;Bartlett and Haung, 1973;Haung and Bartlett, 1976). Sohn and co-workers (Sohn and Rajamani, 1977;Rajamani and Sohn, 1983;Sohn and Won, 1985) developed a model for successive gas±solid reactions in a porous pellet. The model takes into consideration the effects of the relative amounts of the solids, grain sizes, the pellet size and porosity, and the diffusion of gaseous species, as well as the effect of improved thermodynamics in systems represented by the first example.…”

Section: Solid±solid Reactions Proceeding Through Gaseous Intermediatmentioning

confidence: 99%

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The kinetics of metallurgical reactions

Sridhar

Sohn

2005

Fundamentals of Metallurgy

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Section: Solid±solid Reactions Proceeding Through Gaseous Intermediatmentioning

confidence: 99%

Section: Solid±solid Reactions Proceeding Through Gaseous Intermediatmentioning

confidence: 99%

The kinetics of metallurgical reactions

Sridhar

Sohn

2005

Fundamentals of Metallurgy

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“…The systems involving successive gas‐solid reactions are exemplified by the reactions that use lime as a getter of sulphur compound gases. An example is the H 2 reduction of metal sulphides mixed with lime, as written in the following general form:

{normalH}_{2} + {M e}_{normalx} S = {normalH}_{2} S + x M e

{normalH}_{2} S + C a O = {normalH}_{2} O + C a S

{normalH}_{2} + {M e}_{normalx} S + C a O = {normalH}_{2} O + x M e + C a S .

…”

Section: Successive Gas‐solid Reactionsmentioning

confidence: 99%

Review of fluid‐solid reaction analysis—Part 3: Complex fluid‐solid reactions

Sohn

2019

Can J Chem Eng

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In this Part 3 of the series, we discuss work done on the rates of complex fluid-solid reactions. It is shown that many of the complex systems can be analyzed by recognizing the component single fluid-solid reactions. The overall reaction system is then quantitatively described by combining the mathematical relationships for the component single reactions discussed in Parts 1 and 2. [1,2] In many cases, Sohn's law of additive reaction times discussed in Part 2 is shown to provide a useful means of simplifying the quantitative description of the complex fluid-solid reactions. [2]

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“…(xv) Sohn and Rajamani (1977) have proposed a model for successive gas-solid reaction of these types. The model can be used to determine the optimum structure of the pellet and to provide useful guidelines for the design of experimental investigations of these reactions.…”

Section: Reaction Of Two Components In the Solidmentioning

confidence: 99%

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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Successive gas-solid reactions in a porous pellet: Application to the reaction of metal sulfides in the presence of lime

Cited by 25 publications

References 15 publications

The kinetics of metallurgical reactions

The kinetics of metallurgical reactions

Review of fluid‐solid reaction analysis—Part 3: Complex fluid‐solid reactions

Modeling of noncatalytic gas‐solid reactions

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