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Prevention of defluidization by gas dilution for reactions involving gas–volume reduction

Authors :
Tsutomu Nakazato
Mitsunobu Furukawa
Mitsuyuki Nakajima
Takami Kai
Source :
Chemical Engineering Journal. 166:1126-1131
Publication Year :
2011
Publisher :
Elsevier BV, 2011.

Abstract

In industrial fluidized bed processes, the system often involved a change in volumetric flow. Defluidization occurs when reactions involving a decrease in gas volume are carried out in a fluidized catalyst bed. This is due to decrease in gas velocity below the minimum fluidization velocity in the emulsion phase. One method to improve fluidization quality is to supply an inert gas with reactant gases: similar effect can be obtained by supplying an excessive amount of one of the reactants. In the present study, the effect of a diluted reactant gas on fluidization quality is quantitatively analyzed by performing CO2 hydrogenation in a fluidized catalyst bed. Stable operation can be established by operating the fluidized bed to avoid the conditions contained in the defluidization zone using two parameters that influence fluidization quality.

Details

ISSN :
13858947
Volume :
166
Database :
OpenAIRE
Journal :
Chemical Engineering Journal
Accession number :
edsair.doi...........77c65757f351514d07d49fb3f670dfc1
Full Text :
https://doi.org/10.1016/j.cej.2010.12.045