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Khatamian M.,University of Tabriz | Daneshvar N.,University of Tabriz | Sabaee S.,University of Tabriz | Radmanesh R.,E. I. du Pont Canada Company
Iranian Journal of Chemistry and Chemical Engineering | Year: 2010

The photocatalytic decolorization of aqueous solutions Brown NG, a commercial textile dye, was studied using titana Degussa P-25 as a catalyst for the first time. The experiments were carried out in a batch reactor with the use of artificial light sources (UV-C). The effects of various process variables on decolorization performance of the process have been investigated. The photodegradation of Brown NG was enhanced by the addition of proper amounts of hydrogen peroxide, but it was inhibited by ethanol. Inhibiting effect of ethanol showed that hydroxyl radicals play a significant role in the photodegradation of the dye. In addition, the decolorization efficiency increased with decrease in pH, which implies that the pH is a very important parameter in dye adsorption. The efficiency is inversely related to the dye concentration. Results of TOC analysis show that the organic compounds were degraded, too. Source


Bashiri H.,University of Tehran | Mostoufi N.,University of Tehran | Radmanesh R.,E. I. du Pont Canada Company | Sotudeh-Gharebagh R.,University of Tehran | Chaouki J.,Ecole Polytechnique de Montreal
Iranian Journal of Chemistry and Chemical Engineering | Year: 2010

Effect of scale on the hydrodynamics of gas-solid fluidized beds was investigated in two fluidized beds of 152 mm and 78 mm in diameter. Air at room temperature was used as the fluidizing gas in the bed of sand particles. The Radioactive Particle Tracking (RPT) technique was employed to obtain the instantaneous positions of the particles at every 20 ms of the experiments. These data were used to calculate hydrodynamic parameters, such as mean velocity of upward and downward-moving particles, jump frequency, cycle frequency and axial and radial diffusivities, which are representative of solid mixing and diffusion of particles in the bed. These hydrodynamic parameters were compared in both scales in order to determine the scale effect on the hydrodynamics of the gas-solid fluidized bed. In all cases, it was shown that solid mixing and diffusivity of particles increase by increasing column diameter. The results of this study would help to understand solid mixing which might be critical in industrial fluidized bed reactors. Source


Sanaei S.,University of Tehran | Mostoufi N.,University of Tehran | Radmanesh R.,E. I. du Pont Canada Company | Sotudeh-Gharebagh R.,University of Tehran | And 2 more authors.
Canadian Journal of Chemical Engineering | Year: 2010

Effect of temperature on the hydrodynamics of bubbling gas-solid fluidized beds was investigated in this work. Experiments were carried out at different temperatures ranged of 25-600°C and different superficial gas velocities in the range of 0.17-0.78m/s with sand particles. The time-position trajectory of particles was obtained by the radioactive particle tracking technique at elevated temperature. These data were used for determination of some hydrodynamic parameters (mean velocity of upward and downward-moving particles, jump frequency, cycle frequency, and axial/radial diffusivities) which are representative to solids mixing through the bed. It was shown that solids mixing and diffusivity of particles increases by increasing temperature up to around 300°C. However, these parameters decrease by further increasing the temperature to higher than 300°C. This could be attributed to the properties of bubble and emulsion phases. Results of this study indicated that the bubbles grow up to a maximum diameter by increasing the temperature up to 300°C, after which the bubbles become smaller. The results showed that due to the wall effect, there is no significant change in the mean velocity of downward-moving clusters. In order to explain these trends, surface tension of emulsion between the rising bubble and the emulsion phase was introduced and evaluated in the bubbling fluidized bed. The results showed that surface tension between bubble and emulsion is increased by increasing temperature up to 300°C, however, after that it acts in oppositely. © 2010 Canadian Society for Chemical Engineering. Source


Trademark
E.I. Du Pont Canada Company | Date: 2008-10-28

SENSING TECHNOLOGY, NAMELY, AN ELECTRICAL SENSING DEVICE USED TO ASSESS QUALITY CHARACTERISTICS OF AGRICULTURAL COMMODITIES.


Trademark
E.I. Du Pont Canada Company | Date: 2006-02-28

SENSING TECHNOLOGY, NAMELY, AN ELECTRICAL SENSING DEVICE USED TO ASSESS QUALITY CHARACTERISTICS OF AGRICULTURAL COMMODITIES..

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