Solvent Extraction of Aromatic Components from Lube-Oil Cut byN-methylpyrrolidone (NMP)

Abstract

A method has been developed for the modeling of complex hydrocarbon mixtures which is based on the accurately simulated distillation gas chromatography analysis as well as the extended method of Ruzicka et al for making the model molecules. The method has been used for modeling of the complex mixture of the lube-oil cut SAE 10 in the aromatics extraction process with the solvent N-methylpyrrolidone (NMP) from the Tehran Refinery. To carry out the liquid-liquid equilibria calculations, the van der Waals surface and volume size parameters of the model molecules and NMP as well as their interaction parameters are required which they are calculated by the Bondi's group contribution method with the NMP molecule taken as a functional group according to the approach of Rahman et al. Solvent extraction process at two temperatures of 50 and 42 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 precise measuring systems using the standard methods of ASTM and the well-known Riazi's equations. Finally, the results of the equilibrium calculations have been compared with the experimental data and good agreement was found.

Liquid–liquid equilibrium in the systems furfural+light lubricating oils using UNIFAC

“…Group contribution methods such as UNIFAC [15] have been widely used to describe the LLE for several solvent + hydrocarbon systems including sulfolane + hydrocarbon [16]; aniline + paraffin and furfural + paraffin systems [17]. Vakili-Nezhaad et al [18] applied a UNIFAC based method to describe the extraction of aromatics from lubricating oils using N-methylpyrrolidone as solvent. These authors have described the composition of lubricating oil mixtures by using three model-molecules.…”

A model to predict physical properties for light lubricating oils and its application to the extraction process by furfural

“…For many years, several works have been focused on looking for selective solvents for aromatics extraction from hydrocarbon mixtures (Vakili-Nezhaad et al, 1999). A good solvent has to maximize differences in properties between the liquid phases to reduce the loss of oil (Sequeira, 1994).…”

“…The pseudo-components approach based on distillation curves is widely used to represent the complex composition of petroleum fractions (Briesen and Marquardt, 2004), although it is not effective in LLE modeling because chemical structure has much bigger effect than boiling temperature. For that reason, the "molecules-type" approach should be more convenient since it makes difference according to chemical nature of compounds (Vakili-Nezhaad et al, 1999). In order to determine the composition of complex mixtures, standard test methods, such as ASTM D2007, are frequently used.…”

Application of a generalized model to the estimation of physical properties and description of the aromatic extraction from a highly paraffinic lubricating oil

“…For many years several works have been focused on looking for selective solvents for aromatic extraction from hydrocarbon mixtures (Vakili-Nezhaad et al, 1999). Furfural is one of the most widely used solvents because its high selectivity towards aromatic compounds which slowly decreases with increasing temperature and is acceptable for both light and heavy vacuum distillates as reported by different authors (De Lucas et al, 1993).…”

“…The "molecule-type" approach is able to represent these differences according to the chemical structure of compounds and it has been applied to describe the LLE in solvent+lubricating oil systems (Vakili-Nezhaad et al, 1999).…”