HIGH-TEMPERATURE MEMBRANE REACTOR FOR CATALYTIC GAS-SOLID REACTIONS

被引:33
作者
SLOOT, HJ [1 ]
SMOLDERS, CA [1 ]
VANSWAAIJ, WPM [1 ]
VERSTEEG, GF [1 ]
机构
[1] TWENTE UNIV TECHNOL,DEPT CHEM ENGN,7500 AE ENSCHEDE,NETHERLANDS
关键词
Catalytic gas-solid reactions - Claus reaction - Dusty gas model - High-temperature membrane reactors - Molecular diffusion - Reversible reactions;
D O I
10.1002/aic.690380610
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
A mathematical model, based on the dusty-gas model extended with surface diffusion, is presented that describes mass transport owing to molecular diffusion and viscous flow, as well as an instantaneous reversible reaction inside a membrane reactor. The reactants are fed to opposite sides of the membrane, considering mass-transfer resistances in the gas phase outside the membrane. The Claus reaction is chosen as a model reaction to study this membrane reactor. The model is used to validate a previously presented simplified model. The simplified model predicts correct molar fluxes when it is very dilute and can therefore be considered a pseudo-binary system. Occurrence of a maximum or a minimum in the pressure profile inside the membrane, in the absence of an overall pressure difference over the membrane, depends not only on the stoichiometry of the reaction but on mobilities of the different species. The Claus reaction is used to verify experimentally the transport model for a nonpermselective membrane reactor with a mean pore diameter of 350 nm. At 493 K and 542 K, molar fluxes experimentally determined are 10 to 20% lower than those predicted by the transport model. Conversions measured at pressures of 220 kPa and 500 kPa demonstrate that surface diffusion occurs as a transport mechanism despite the large pore diameter of the membrane. In the presence of a pressure difference over the membrane, there is a reasonable agreement between experimentally determined molar fluxes and those calculated by the transport model.
引用
收藏
页码:887 / 900
页数:14
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