𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Noncatalytic gas-solid reactions: modelling of simultaneous reaction and formation of surface with a nonisothermal crackling core model

✍ Scribed by Gerd Uhde; Ulrich Hoffmann

Book ID
104107605
Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
670 KB
Volume
52
Category
Article
ISSN
0009-2509

No coin nor oath required. For personal study only.

✦ Synopsis

This work presents a novel numerical gas-solid reaction model which is based on the mass and the heat transport in the pellet. The initial nonporous pellet is transformed into a porous pellet upon the reaction. Due to this transformation, the increased surface of the pellet accompanied by an accelerated reaction rate leads to a periodic ignition-extinguishing behaviour of the system. These oscillations are discovered observing hydrochlorination of metallurgical-grade silicon (Si + 3HC1 ---, SiHC13 + H2), a process of importance in industry, and could be explained by the novel model.

📜 SIMILAR VOLUMES

The three-stage model of noncatalytic ga
The three-stage model of noncatalytic gas—solid reactions—a supplement
✍ You-Im Chang; Jung-Ann Kuo 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 308 KB

Greek letters YE shear rate, s-I P density of liquid, kg/m3 PS density of solids, kg/m3 b thickness of the boundary layer REFERENCES Einenkel, W.-D., 1980, influence of physical properties and equipment design on the homogeneity of suspensions in agitated vessels. User. Chem. Engng 3, 118-124. Fall&

Comparison of zone-reaction model and un
Comparison of zone-reaction model and unreacted-core shrinking model in solid—gas reactions—I isothermal analysis
✍ M. Ishida; C.Y. Wen 📂 Article 📅 1971 🏛 Elsevier Science 🌐 English ⚖ 828 KB

Three types of zone-reaction models representing reactions between porous solid and gas are compared. When the diffusion of gaseous reactant affects the overall reaction rate, the reaction proceeds at the core surface. By introducing the concept of an equivalent rate constant, &, based on the surfac

Deactivation model for textural effects
Deactivation model for textural effects of kinetics of gas-solid noncatalytic reactions “char gasification with CO2”
✍ Nail Yaşyerli̇; Timur Doǧu; Gülşen Doǧu; i̇rfan Ar 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 434 KB

Variation of the reactivity of a solid reactant due to changes in number of working active sites and pore structure was represented by a deactivatiOn model. The model was shown to give good aggreeme~ with the experimental data obtained for the gasification of chars of different lignitas. All the kin