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    STUDIA CHEMIA - Ediţia nr.1 din 2005  
         
  Articol:   MODELING AND SIMULATION OF THE CARBONATION PROCESS OF AMMONIACAL BRINE USING CHEMCAD.

Autori:  CĂLIN-CRISTIAN CORMOŞ, ANA-MARIA CORMOȘ, PAUL ŞERBAN AGACHI. 		 
       
         
  Rezumat:  In this paper the model and the simulation results for carbonation process of ammoniacal brine solution have been presented. Carbonation process of ammoniacal sodium chloride solution (brine) is used to obtain sodium bicarbonate and sodium carbonate in soda ash plants (according to Solvay process). The carbonation process of ammoniacal sodium chloride solution is done using tray absorption columns, typically in a three columns sequence. The first absorption column is used to saturate the ammoniacal brine with carbon dioxide. The second column is a scrubbing unit used to recover residual carbon dioxide from the gaseous effluent coming from first and third columns. In the third column, the final saturation of the liquid phase with carbon dioxide and the precipitation of sodium bicarbonate take place. The carbonation process of ammoniacal sodium chloride solution is a complex process because of chemical reactions that involve the species present in the liquid phase. Modeling and simulation of the carbonation process of ammoniacal sodium chloride solution and precipitation of sodium bicarbonate were done using ChemCAD software package. The evolutions of the process parameters were studied during the carbonation process. The model and the simulation results proved to be a reliable tool for analyzing the carbonation and precipitation processes and can be used to improve the real plant operation.  
         
     
         
         
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