Molecular-thermodynamic framework for asphaltene-oil equilibria

Molecular-Thermodynamic Framework for Asphaltene-Oil Equilibria

Asphaltene precipitation is a perennial problem in producing and rejming crude oils. To avoid precipitation, it is usefid to know the solubility of asphaltenes in petroleum liquids as a function of temperature, pressure and liquid-phase composition In the novel molecular-thermodynamic flamework presented here, both asphaltenes and resins are represented by pseudo-pure components while all other...

Thermodynamic Properties and Phase Equilibria for Liquid Fluorine Using GMA Equation of State

Thermophysical properties of fluorine are interesting because of its applications in different areas of technologyand industry. The computations of thermodynamic properties were performed with the GMA equation of stateunder critical conditions. The present work reports calculations of density, volumetric, and thermodynamicproperties of liquid fluorine on extended ranges of pressure and temperat...

Molecular Simulation of Asphaltene Aggregation in Crude Oil by Monte Carlo Method

Molecular Thermodynamics of Asphaltene Precipitation in Reservoir Fluids

A pre®iously described molecular-thermodynamic framework, based on colloid theory, is used to correlate experimental asphaltene-precipitation data at high-temperature and pressure conditions. In this framework, asphaltenes and resins are represented by pseudopure components, and all other components in a crude oil are presented by a continuous medium that affects ®an der Waals attractions among...

Thermodynamic treatment of oligonucleotide duplex-simplex equilibria.

Thermodynamic formulations have been devised to obtain Delta G degrees values directly from spectroscopic data at a fixed common temperature in nucleic acid duplex-simplex melting curves. In addition, the dependence of melting on salt concentration has been expressed in terms of a stepwise stoichiometric representation, which leads to a specific equation for the partition of the added sodium io...