An improved characterization of naphtha can be obtained by assuming representative chemical components for each cut and utilizing an empirical model to predict the physical and thermodynamic properties such as critical properties, molar mass, refractive index, enthalpy of vaporization, viscosity, etc. The improved model for feed characterization utilizes a multivariable constraint optimization technique in order to arrive at the properties of the blend. It was found that this model does improve the accuracy of prediction.
An application is presented for a naphtha blending system and a naphtha debutanizer. The sensitivity of the column simulation to the developed feed characterization method has been investigated by digital simulation. With the boiling point model, large deviations from the actual column performance data have been observed while a farily good match has been obtained with the improved model.
Il est possible d'obtenir une caracterisation amelioree du naphte en supposant des composants chimiques representatifs pour chaque coupe et en faisant appel a un modele empirique pour predire les proprietes physiques et thermodynamiques, telles que les proprietes critiques, la masse molaire, l'indice de refraction, l'enthalpie de vaporisation, la viscosite, etc. Le modele ameliore pour la caracterisation de l'alimentation utilise une technique d'optimisation multivariee afin d'en arriver aux proprietes du melange. On a trouve que le modele ameliore effectivement l'exactitude de la prediction.
On presente une application pour un systeme de melange de naphte et un debutaniseur de naphte. La sensibilite de la simulation de la colonne a la methode de caracterisation de l'alimentation proposee a ete etudiee par simulation numerique. Avec le modele du point d'ebullition, on a observe des ecarts importants par rapport aux donnees actuelles sur la performance des colonnes, tandis qqu'un accord relativement satisfaisant a ete obtenu avec le modele ameliore.
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