Kinetic study on the reactions involved in hot gas desulfurization using a regenerable iron oxide sorbent—III. Reactions of the sulfided sorbent with steam and steam-air mixtures

✍ Scribed by S.S. Tamhankar; S. Garimella; C.Y. Wen

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 695 KB
• Volume: 40
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(85)85016-8

✦ Synopsis

In continuation of the earlier studies on sorbent regeneration, reactions of the sulfided iron oxide sorbent with steam and steam-air mixtures were investigated. This paper describes experimental results on the kinetics of these reactions. As before, experiments were conducted in a thermogravimetric analyser (TGA) and conversion data for the steam reaction were correlated using the grain model, described in Part I. The intrinsic activation energy for this reaction is found to be 16.36 kcal/mol. Effects of particle size and temperature on the rate of reaction were studied to identify proper rate-controlling regimes.

For the reactions with steam-air mixtures, a parallel reaction scheme is proposed and a simple equation suggested to correlate the conversion-time data. Accordingly, the overall rate is obtained by the addition of the rates of reactions of the sulfided sorbcnt with steam and with air. Using the earlier results for these two reactions, conversion curves are calculated and compared with the experimental data.