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    STUDIA CHEMIA - Issue no. 1-2 / 2000  
         
  Article:   THERMODYNAMIC EVALUATION OF COAL REACTIVITY.

Authors:  OSSI HOROVITZ, ELENA MARIA PICĂ, GAVRIL NIAC.
 
       
         
  Abstract:  From empirical formulae for 10 Romanian coals and from their heating values, thermodynamic parameters are evaluated: enthalpies, entropies, heat capacities. With these values, the Gibbs free energies and equilibrium constants for some reactions during coal gasification (including reactions with carbon dioxide, steam, oxygen) are calculated, for temperatures in the 25...1000oC range. The temperature and pressure dependence of the equilibria is discussed by means of zero-affinity plots. Lignites present a much higher thermodynamic reactivity then graphite, that should be exploited in the choice of gasification conditions for coals.  
         
     
         
         
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