Prediction of molecular-type analysis of petroleum fractions and coal liquids

Abstract

Different sets of correlations for prediction of composition of petroleum fractions and coal liquids in terms of readily available parameters are proposed. Paraffinic, naphthenic, and aromatic portions of olefin-free fractions can be predicted from the knowledge of either specific gravity, refractive index, and viscosity or molecular weight, refractive index, and carbon to hydrogen weight ratio. The proposed correlations may be used for fractions with molecular weights of 70-600. For coal liquids or highly aromatic fractions, correlations in terms of molecular weight, refractive index, and density are proposed to predict monoaromatic and polyaromatic portions of the fraction. These correlations are applicable to fractions with molecular weights up to 250.Petroleum fractions are mixtures of different hydrocarbons from different homologous groups. When the pseudocompound method is used for prediction of thermophysical properties of undefined petroleum fractions (Huang and Daubert 1974;Riazi, 1979), knowledge of the paraffin, olefin, naphthene, and aromatic content of the fraction is necessary. However, most petroleum fractions for which data on their composition are available are free from olefins, and most coal liquids are highly aromatic (80-90% aromatic).

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

“…The methods reported by Riazi and Daubert (1986), Riazi and Roomi (2001), API (1987a,b) and Gomez (1992) were used to calculate the liquid density at 293 K for the involved mixtures. In addition, Riazi and Daubert (1986) and Riazi and Roomi (2001) reported a method used to calculate the refractive index at 293 K. The method proposed by Riazi et al (1999) allowed the estimation of the sulfur content in similar mixtures to the ones here reported. All these methods require the average boiling point of the mixture obtained from the ASTM D86 distillation curve.…”

“…Therefore, the correlation between physical properties and composition appears as the key point for the characterization of complex hydrocarbon mixtures. According to that, different authors as Riazi and Daubert (1986) have proposed correlations between the composition (in paraffins, naphtenes and aromatics) and the physical properties (such as the refractive index and the viscosity) for the petroleum mixtures, obtaining good results.…”

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

“…1) for extracting aromatic components from the lube-oil cut SAE 10 of the Tehran Refinery by the solvent N-methylpyrrolidone. Equilibrium composition of the resultant phases, i.e., raffinate and extract have been obtained after evaporating of solvent from the phases in the rotary evaporator system by measurement of the density by a densitometer Model DMA 48 (Austoria made) with the accuracy of +0.000003 g/cm 3 , refractive index by the standard method of ASTM D1218 with the accuracy of +0.00006 and viscosity using the reliable equations of Riazi [15]. Measured values of these parameters for the lube oil cut have been given in Tab.…”

A Computer-Aided Tool for the Simulation and Optimization of the Combined HDS–FCC Processes

“…Moreover, the mean average boiling point of the hydrotreated feed was estimated from the specific gravity and the refractive index [as they are calculated from equation (14)], based on an empirical correlation presented in the literature (Riazi and Daubert, 1986). For the development of the short-form models of equation (14) the meta-modelling approach was adopted.…”