Model compounds were used to provide some chemical boundaries for the eight-fraction SAR-ADTM characterization method heavy oils. It was found that Saturates fraction consists of linear and highly cyclic alkanes; Aro-1 molecules with a single aromatic ring; Aro-2 mostly 2 3-ring fused molecules, pericondensed 4-ring molecule pyrene, 3–5 rings are not fused; Aro-3 4-membered catacondensed aromat...

the basics of quantum mechanics and statistical thermodynamics were used to predict the potential energy and intermolecular forces of asphaltene molecules. the parameters associated with the chemical structure were also estimated for a specific asphaltene molecule to predict the mie potential function. based on the structural results, a new form of the virial eos with peneloux correction was de...

The precipitation of asphaltenes in two Mexican crude oils was measured using a combination of high-pressure isothermal expansion and atmospheric titration with nalkanes. Experiments were carried out from the liveand tank-oil type of samples of the same crude oils. For the oils investigated, compositional data, precipitation phase diagrams, and bubble point pressures are reported. A theoretical...

A number of procedures to identify and measure the precipitates that result from petroleum fluids are presented. The Ž . fractions considered in this study include those in the categories of asphaltenes, resins, saturates paraffinrwax , aromatics, inorganic minerals and diamondoids. A combination of deposition techniques, separation by centrifuge, filtration, gas Ž . chromatography, gel-permeat...

Abstract In this paper, the effect of asphalt deposition inhibitors coal tar, bromohexadecylpyridine and sodium oleate on viscosity reduction asphaltene crude oil was investigated. The results show that tar has a better inhibitory asphaltenes in oil. is best when addition amount 0.5%. Compared with blank, content reduced from 24.47% to 9.42%. cationic surfactant have good synergistic effect, by...