The role of small bubbles in gas–liquid mass transfer in stirred vessels and assessment of a two-fraction model for noncoalescent or moderately viscous liquids

2007 ◽  
Vol 62 (14) ◽  
pp. 3767-3776 ◽  
Author(s):  
D. Pinelli
Keyword(s):  
Mass Transfer ◽  
Viscous Liquids ◽  
Stirred Vessels ◽  
Liquid Mass ◽  
Liquid Mass Transfer ◽  
Small Bubbles

Gas/liquid mass transfer in stirred vessels

1992 ◽  
Vol 47 (9-11) ◽  
pp. 2357-2362 ◽  
Author(s):  
V. Schlüter ◽  
W.-D. Deckwer
Keyword(s):  
Mass Transfer ◽  
Stirred Vessels ◽  
Liquid Mass ◽  
Liquid Mass Transfer

Gas-liquid-solid Operation of a High Aspect Ratio Self-ingesting Reactor

2012 ◽  
Vol 10 (1) ◽  
Author(s):  
Francesca Scargiali ◽  
Antonio Busciglio ◽  
Franco Grisafi ◽  
Alberto Brucato
Keyword(s):  
Mass Transfer ◽  
Liquid Phase ◽  
Dynamic Pressure ◽  
Solid Particles ◽  
Phase System ◽  
Stirred Vessels ◽  
Liquid Mass ◽  
Mass Transfer Parameter ◽  
Three Phase ◽  
Liquid Mass Transfer

Gas-liquid stirred vessels are widely employed to carry out chemical reactions involving a gas reagent and a liquid phase. The usual way for introducing the gas stream into the liquid phase is through suitable distributors placed below the impeller. An interesting alternative is that of using “self ingesting” vessels where the headspace gas phase is injected and dispersed into the vessel through suitable surface vortices. In this work the performance of a Long Draft Tube Self-ingesting Reactor (LDTSR) dealing with three-phase (gas-liquid-solid) systems, is investigated. Preliminary experimental results on the effectiveness of this contactor for particle suspension and gas-liquid mass transfer performance in the three-phase system, are presented. Mass-transfer parameter kLa was measured by the recently introduced Simplified Dynamic Pressure Method (SDPM). It is found that the presence of low particle fractions causes a significant increase of the minimum speed required for vortex ingestion of the gas. Impeller pumping capacity and gas-liquid mass transfer coefficient are found to be affected by the presence of solid particles.

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