فهرست مطالب هادی باصری

Adsorption and desorption of substances in the surface of adsorbent materials are very important in various chemical industries. In this work, at first, desorption of carbon dioxide on activated carbon fixed bed were examined, then by using of a two dimensional geometry and finite elements method with COMSOL multiphysics software the desorption phenomena were simulated numerically. By using of the proposed numerical model the effects of some effective parameters were studied theoretically. Modeling of activated carbon fixed bed was performed for two fixed and mobile phases in the bed and in stationary and time dependent regimes. Based on the reported results in this work, the mass transfer coefficient and the outlet flux of carbon dioxide from the particles of bed are effective parameters on the desorption phenomenon.

In this work production of nano powders by means of sol-gel route were reviewed. Proposed mechanisms, required materials such as solvents or solutes that used for production of industrial nano powders and the effects of them on the characteristics of products were evaluated. Various processes that used for production of nano metal fluorides such as AlF3 and MgF2, nano composites such as Al2O3-ZrO2 and nano metal oxides such as TiO2 and TiO2 adapted to Mg2+ and Br2+ were also reviewed.

The precise Liquid - liquid equilibrium (LLE) data are needed and required in design of many chemical processes, separation operations, and fermentation industry. In this research, (LLE) data for (trichloroethylen + propionic acid + water) were determined at atmospheric pressure and 300.15 K. LLE phase diagram was obtained for this ternary system. The distribution coefficients and the selectivity factors of the solvent were calculated. It can be seen that the separation factor values decrease from 10.55 to 4.317 with increasing propionic acid weight fraction in aqueous phase from 0.06 to 0.4.

In this paper operating parameters that used by various researchers for supercritical fluid extraction of pharmaceutical agents from six various types of pharmaceutical plants were studied. Materials that studied here have many applications in the pharmaceutical, food and cosmetic industries and nowadays we see an increasing demand for replacing of these materials by synthetic materials. In this work, effects of various parameters such as temperatures and pressures of extraction fluid, extraction time, mean particle size of powders and other effective parameters on the yield of extraction and composition of extract were reviewed. And optimum conditions for the best composition of extract and highest yield of extraction were reported.

The precise Liquid - liquid equilibrium (LLE) data are needed and required in design of many chemical processes, separation operations, and fermentation industry. In this research, (LLE) data for (trichloroethylen + propionic acid + water) were determined at atmospheric pressure and 300.15 K. LLE phase diagram was obtained for this ternary system. The distribution coefficients and the selectivity factors of the solvent were calculated. It can be seen that the separation factor values decrease from 10.55 to 4.317 with increasing propionic acid weight fraction in aqueous phase from 0.06 to 0.4.