in this work, the solubility of nicotine extracted from tobacco leaves, found in the north of iran, in supercritical carbon dioxide has been measured. also the effects of pressure, temperature, extraction dynamic time, and the organic co-solvent on the amount of nicotine extracted from tobacco leaves have been investigated. it should be stressed that in order to reduce significantly the number ...

asphaltenes are the n-pentane or n-heptane insoluble fractions of crude oil that remain in solution under reservoir temperature and pressure conditions. they are destabilized and start to precipitate when the pressure, temperature and/or composition changes occur during primary production. the precipitated asphaltene particles will then grow in size and may start to deposit onto the production ...

a statistical mechanical based equation of state has been employed to calculate the liquid density of lead, mercury, bismuth and lead-bismuth and lead-lithium eutectic alloys.the equation is basically that of song, mason and ihm [ihm g, song y, mason ea. j. chem. phys.1991; 94: 3839] which is modified by ghatee and boushehri. three temperature dependent parameters are required to use this equat...

We investigate warm dense matter by performing quantum molecular dynamics (QMD) simulations based on density functional theory (DFT). Dense hydrogen is the main component in giant planets and, therefore, of particular interest. We present new results for the equation of state and the Hugoniot curve and compare with experiments. Density functional theory is based on the theorems of Hohenberg and...

– We use video microscopy to study a two-dimensional (2D) model fluid of charged colloidal particles suspended in water and compute the pressure from the measured particle configurations. Direct experimental control over the particle density by means of optical tweezers allows the precise measurement of pressure as a function of density. We compare our data with theoretical predictions for the ...

Abstract The accurate calculations of adsorption equilibrium for multicomponent gas systems are of great importance in many applications. In this paper, five two-dimensional equations of state 2D-EOS, i.e. Van der Waals, Eyring, Zhou-Ghasem-Robinson, Soave-Redlich-Kwong and Peng-Robinson, were examined to find out their abilities to predict adsorption equilibrium for pure and multi-component ga...

An alternative to the well-known complete form of Mie-Gr\"uneisen equation state (EOS) for water is suggested. A closed analytical description self-consistent EOS an arbitrary medium based only on first law thermodynamics and a new virial theorem obtained. This (allowing variable power-law exponent particles interaction potential) result generalization known method similarity (Feynman et al., 1...

The two-critical point ~TCP! scenario for supercooled water was tested against experimental data with the crossover equation of state ~CR EOS! based on the fundamental results of the fluctuation theory of critical phenomena. The CR EOS predicts a second critical point, CP2, in supercooled water with the parameters Tc25188 K, rc251100 kg•m , Pc25230 MPa, and represents the experimental values of...

We investigate the Equation of State (EOS) of classical systems having 300 and 512 particles con ned in a box with periodic boundary conditions. We show that such a system, independently on the number of particles investigated, has a critical density of about 1/3 the ground state density and a critical temperature of about 2:5 MeV . The mass distribution at the critical point exhibits a power l...

Air is one of the most important substances used in industrial and technological applications. Applications air require a consistent set reliable data on its thermodynamic thermophysical properties. Over last few decades, researchers have developed number empirical theoretical models for correlation prediction properties pure fluids mixtures. The ideal gas Equation State (EoS) property calculat...