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چکیده
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The Perturbed Chain SAFT (PC SAFT) [1] model is an equation of state developed for modeling all types of substances: gases, solvents and polymers. This equation has been utilized to predict thermodynamic properties for the pure components and the mixtures[1,2]. PC-SAFT include three pure compound parameters : the segment energy and size, the number of segments and in the cases with association extra parameters volume and energy. Determining these PC SAFT parameters for each component is the first challenge in using this equation. The aim of this study was to determine these parameters for dimethyl sulfoxide (DMSO). Dimethyl sulfoxide ( DMSO ) is an effective solvent in chemical synthesis and reactions. Besides it has industrial applications including herbicides, fungicides, antibiotics, paint stripper and coating remover. So, density data of DMSO at high-pressure and high-temperature are important for many industries. In this study, high pressure and temperature densities data of pure DMSO were measured at pressures approximately up to 40MPa and temperatures up to 473K . Finally, PC-SAFT parameters were determined from density data. We calculated the properties such as isothermal compressibility, , thermal expansion coefficient, , and speed of sound from PC-SAFT equation. Good agreement was found between PC-SAFT and the experimental data.
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