Solvent extraction of aromatic components from lube-oil cut by N-methylpyrrolidone (NMP)

A method has been developed for the modeling of complex hydrocarbon mixture s which is based on the accurately simulated distillation gas chromatograph y analysis as well as the extended method of Ruzicka et al for making the m odel molecules. The method has been used for modeling of the complex mixtur e of the lube-oil cut SAE 10 in the aromatics extraction process with the s olvent N-methylpyrrolidone (NMP) from the Tehran Refinery. To carry out the liquid-liquid equilibria calculations, the van der Waals surface and volum e size parameters of the model molecules and NMP as well as their interacti on parameters are required which they are calculated by the Bondi's group c ontribution method with the NMP molecule taken as a functional group accord ing to the approach of Rahman et al. Solvent extraction process at two temperatures of 50 and 42 degrees C both at 1 atm have been carried out in a batch mixer-settler and the properties of resultant phases (extract and raffinate) have been determined by the pre cise measuring systems using the standard methods of ASTM and the well-know n Riazi's equations. Finally, the results of the equilibrium calculations h ave been compared with the experimental data and good agreement was found.