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    STUDIA CHEMIA - Issue no. 4 / 2013  
         
  Article:   KINETIC ANALYSIS OF THERMAL DECOMPOSITION OF THE LIMESTONE AND PRECIPITATE CALCIUM CARBONATE .

Authors:  SIMION DRĂGAN. 		 
       
         
  Abstract:   In this paper, decomposition reaction of limestone and precipitate calcium carbonate (PCC) was investigated, using thermo gravimetric analysis technique. All experiments were performed in isothermal conditions, within a temperature range of 973-1173 K, with main diameters of granules: 63µm, 180µm, and 450µm. The temperature influence was found using Arrhenius law. The reaction rate constant k and activation energy Ea have been determined. The values were found to be between: k=1.8 x10-3 -4.4x10-3 s-1, Ea=139,9 Kj/mol for limestone and k=2.1 x 10-3 - 6.5 x 10-3 s-1, Ea=124,9 Kj/mol for PCC, according to the values reported in the literature.

Keywords: Ca-looping process, calcium oxide as adsorbent of the CO2, decomposition reaction, rate constant, activation energy.
 
         
     
         
         
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