Reaction of Solid Sorbents with Hydrogen Chloride Gas at High Temperature in a Fixed-Bed Reactor

The gas−solid reaction and breakthrough curves in the fixed-bed reactor are of great importance, and being influenced by a number of factors makes the prediction of these factors a difficult problem. In this study, the reaction rate between solid sorbents and hydrogen chloride gas at high temperatur...

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Bibliographic Details
Published in:Energy & fuels 2005-11, Vol.19 (6), p.2229-2234
Main Authors: Dou, Binlin, Chen, Bingbing, Gao, Jinsheng, Sha, Xingzhong
Format: Article
Language:English
Subjects:
01 COAL, LIGNITE, AND PEAT
ADSORBENTS
ADSORPTION
Air pollution caused by fuel industries
Applied sciences
BENCH-SCALE EXPERIMENTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTORS
CHLORINE
DECHLORINATION
DIFFUSION
Energy
Energy. Thermal use of fuels
Exact sciences and technology
GASES
HOT GAS CLEANUP
HYDROCHLORIC ACID
PACKED BEDS
PARAMETRIC ANALYSIS
Pollution reduction
REMOVAL
SORPTIVE PROPERTIES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0400-1000 K
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Summary:The gas−solid reaction and breakthrough curves in the fixed-bed reactor are of great importance, and being influenced by a number of factors makes the prediction of these factors a difficult problem. In this study, the reaction rate between solid sorbents and hydrogen chloride gas at high temperature was first investigated. On the basis of a fixed-bed reactor, the experimental results were analyzed by the shrinking core model of diffusion and surface chemical reaction control. The results showed that reaction rates of two sorbents with hydrogen chloride gas were controlled by the combination of the surface chemical reaction and diffusion of product layers, and the reaction rates nearly keep constant within 15 h of the initial reaction period and then decrease gradually. The results of the breakthrough curves show that solid sorbents in the fixed-bed reactor are capable of reducing the HCl level to near-zero levels at 550 °C. The experimental results and prediction for breakthrough curves are in good agreement for two sorbents.
ISSN:0887-0624
1520-5029
DOI:10.1021/ef050151t