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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/12256

Title: Effect of liquid volume in the gas-separator on the hydrodynamics of airlift reactors
Authors: Al-Masry, W.
Keywords: Airlift reactor; Gas-separator; Hydrodynamics; Newtonian systems
Issue Date: 1999
Publisher: John Wiley & Sons Ltd
Citation: Journal of Chemical Technology and Biotechnology: Volume 74, Issue 10, Pages 931-936
Abstract: Gas hold-up and liquid circulation velocity measurements were made using a 167 dm3 external loop airlift reactor. The gas-separator was of the open channel configuration. The reactor height was 2.5 m with riser and downcomer diameters of 0.19 m and 0.14 m respectively. The systems investigated were Newtonian air-water and air-glycerol with the superficial air velocity varying between 0.02 and 0.12 ms-1. The ratio of the liquid volume in the gas-separator to the liquid volume in the reactor (volume-ratio) was varied from 0.0% to 37%, to find its minimum critical value for optimum operation of the airlift reactor. For the air-water system, discernible effects of the volume-ratio on riser and, downcomer gas hold-ups and liquid circulation velocity were observed at volume ratios < 7%. Beyond this value, the volume-ratio had no effect. For a viscous and foaming air-glycerol system the critical volume-ratio was increased to 19%. New and simple correlations for predicting gas hold-up in the riser, gas hold-up in the downcomer, and liquid circulation velocity were developed with reasonable accuracy. Gas hold-up and liquid circulation velocity measurements were made using a 167 dm3 external loop airlift reactor. The gas-separator was of the open channel configuration. The reactor height was 2.5 m with riser and downcomer diameters of 0.19 m and 0.14 m respectively. The systems investigated were Newtonian air-water and air-glycerol with the superficial air velocity varying between 0.02 and 0.12 m s-1. The ratio of the liquid volume in the gas-separator to the liquid volume in the reactor (volume-ratio) was varied from 0.0% to 37%, to find its minimum critical value for optimum operation of the airlift reactor. For the air-water system, discernible effects of the volume-ratio on riser and, downcomer gas hold-ups and liquid circulation velocity were observed at volume ratios ≤7%. Beyond this value, the volume-ratio had no effect. For a viscous and foaming air-glycerol system the critical volume-ratio was increased to 19%. New and simple correlations for predicting gas hold-up in the riser, gas hold-up in the downcomer, and liquid circulation velocity were developed with reasonable accuracy.
URI: http://hdl.handle.net/123456789/12256
ISSN: 1999
Appears in Collections:College of Engineering

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