
Resume Ce travail traite de la modelisation des donnees thermodynamiques du melange binaire ammoniac/eau a l'aide de l'enthalpie libre. Pour la phase liquide, un modele de l'enthalpie libre d'exces du type Margules a trois constantes est formule. La phase vapeur est consideree comme un melange parfait de gaz reels, chaque gaz pur etant decrit par une equation d'etat du viriel en pression tronquee au troisieme terme. Le modele developpe decrit avec une tres bonne precision le melange dans les trois etats, liquide sous pression, vapeur surchauffee et saturation liquide-vapeur pour des temperatures allant de 200 a 500 K et des pressions jusqu'a 100 bar.
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