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    STUDIA CHEMIA - Issue no. 1-2 / 2001  
         
  Article:   GAS HOLDUP AND LIQUID VELOCITY IN A TRIPHASIC EXTERNAL-LOOP AIRLIFT REACTOR.

Authors:  MARIA GAVRILESCU, FLORINA UNGUREANU. 		 
       
         
  Abstract:  Airlift reactors are heterogeneous contactors suitable for processes in which a close contact between phases and a good mixing are required. Airlift reactors are attractive for research and industry due to their particular hydrodynamic characteristics, which can be easily modified by the selection of a set of geometrical and operating parameters. Under these concerns, experiments were conducted to discern the relationship between the hydrodynamics of a solid-suspended external-loop airlift reactor of laboratory scale, and the operating conditions such as the gas velocity, the solids loading and density. The air flow rate, solids loading and solids density significantly affect the hydrodynamic characteristics of the investigated external-loop airlift reactor. Empirical correlation for gas holdup and liquid circulation velocity were proposed and found to be functions on the above-mentioned operating parameters. A reasonable agreement is found between the predicted and the measured values.  
         
     
         
         
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