Seyyed Khatiboleslam Sadr Nejad; Fateme Asjodi
Abstract
Vanadium is distributed widely and scarcely (150 ppm) on the earth. Its major applications are in steelmaking, dye-production and catalyst-fabrication industries. With the ever-increasing demand for this metal, secondary resource-exploitation of such waste materials as spent catalysts is recommended. ...
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Vanadium is distributed widely and scarcely (150 ppm) on the earth. Its major applications are in steelmaking, dye-production and catalyst-fabrication industries. With the ever-increasing demand for this metal, secondary resource-exploitation of such waste materials as spent catalysts is recommended. Many reactions are involved in vanadium-extraction from these resources. Since roasting in comparison with other reactions is too slow, its investigation is crucial for vanadium revitalization. This paper focuses on sodium-carbonate roasting of vanadium oxide and brings about both process kinetics and the governing rate equations. Experiments are carried out at isothermal conditions with different molar ratios of vanadium oxide to sodium carbonate species (1:1, 3:1 and 6:1). Prevailing mechanism and the activation energies of the roasting steps are determined by application of shrinking core model to the pertaining two-phase reaction.
Rahmat Sotudeh Gharehbagh; Leila Niknam; Navid Mostofi
Abstract
In this paper, a batch hydrogenation reactor performance was modeled using a hydrodynamic and reaction sub-models. The reaction expressions were obtained from the information reported in literature. Experimental studies were conducted in order to generate the experimental data needed to validate the ...
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In this paper, a batch hydrogenation reactor performance was modeled using a hydrodynamic and reaction sub-models. The reaction expressions were obtained from the information reported in literature. Experimental studies were conducted in order to generate the experimental data needed to validate the model. The comparison between the experimental data and model predictions seems quite satisfactory considering the hydrodynamic limitations and simplifications made on the reaction scheme. The results of this study could be considered as framework in developing new process equipment and also soya oil product design for new applications.