ISSN:
0001-1541
Keywords:
Chemistry
;
Chemical Engineering
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
A magnetic method to measure the time and spatial average temperature of supported nickel catalysts in fluidized beds is detailed. It is an extension of a magnetic method developed in this laboratory to study fixed beds. The RMS output voltage of an AC permeameter is used to follow changes in the magnetic moment, hence temperature, of the catalyst upon starting or stopping ethane hydrogenolysis. The theory of the thermometry in fluidized beds is detailed and the observed RMS output voltage vs. time traces for typical experiments are explained. Simulations indicate that signals generated by the moving particles are largely averaged out, since the direction of the magnetic moment of each catalyst particle follows the applied field and is independent of movement. Filtering in the frequency domain can be used to further reduce the effects of particle movement. Calibrations needed to convert AC permeameter output voltage changes to changes in sample temperature during experiments on two distinctly different fluidized beds are the same as for the respective fixed beds. Depending somewhat on the sample moment, the average solid temperature can be determined with a repeatability of a few tenths of a degree.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/aic.690380913
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