ISSN:
0001-1541
Keywords:
Chemistry
;
Chemical Engineering
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
Pulsed-tracer experiments conducted for horizontal gas flow through a horizontal duct of rectangular cross section (height = 12.7 mm) containing powder in the coherent-expanded vibrated-bed state have been reported (Benge and Squires, 1995; Squires and Benge, 1995). Axial gas dispersion in the duct can be treated by a simple model: the dispersion is a “spreading” superimposed on plug flow, with no gas bypassing and no lagging gas indicative of dead zones. At a given weight hourly space velocity, a large variation in axial Peclet number (Peax) can be achieved by varying length of duct and gas superficial velocity in proportion, with no substantial effect upon gas-solid contacting efficiency. Herein, we report data for the methanol-to-olefin reaction conducted in three ducts at lengths affording Peax-values from ∼ 2 to ∼ 20. The new data display a trend in light-olefin yield vs. Peax similar to that reported earlier for three fluid-bed reactors at diameters of 10, 102 and 600 mm.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/aic.690421021
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