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Nabila Shehata , Mohammad S. El-Geundi , Eman A. Ashour , Reda M. A. Abobeah (2016). Structural Characteristics of the Egyptian Clay as a Low-Cost Adsorbent. International Journal of Chemical and Process Engineering Research, 3(2): 35-45. DOI: 10.18488/journal.65/2016.3.2/220.127.116.11
A study of the characteristics of clay from El-Sheikh Fadl Village, El-Minia governorate in Egypt has been carried out. A crucial factor in the applying clay as a low-cost adsorbent, however, is the understanding of the physical, chemical, mineralogical, and colloidal properties of these clays. The characteristics of texture such as surface area, pore volume, porosity, pore size distribution, particle shape and density were determined. The pore size distribution results showed that natural clay is predominantly mesoporous. The thermal behavior of clay was studied using differential thermal analysis and thermogravimetric analysis analysis. The X-Ray diffraction analysis was performed in order to determine the main constituents of the materials. The X-Ray diffraction analysis verified the presence of kaolinite, montmorillonite and quartz in the natural clay. Then clay was tested for infrared spectra, it confirm the presence of the constituents mentioned above. The structure and chemical composition, exchangeable ion type and small crystal size of montmorillonite are responsible for several properties, including a large chemically active surface area.
The paper's primary contribution is finding that the structure, chemical composition and exchangeable ion type of montmorillonite are responsible for several properties, including a large chemically active surface area. and low-cost adsorbents might be a suitable local alternative for elimination of heavy metal ions and basic dyestuffs from aqueous solutions
Modeling of a Tubular Fixed-Bed Reactor for the Production of Dimethyl Ether Using Alumina Catalyst
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Dagde, Kenneth Kekpugile , Harry, Uduak Sylvanus (2016). Modeling of a Tubular Fixed-Bed Reactor for the Production of Dimethyl Ether Using Alumina Catalyst. International Journal of Chemical and Process Engineering Research, 3(2): 23-34. DOI: 10.18488/journal.65/2016.3.2/18.104.22.168
A model to predict the behavior of an adiabatic tubular fixed-bed reactor for the production of dimethyl ether using alumina catalyst was developed. The steady state model incorporates the reaction rate kinetic expression obtained from literature into the model equations. The models were integrated numerically using Fourth-order Runge-Kutta method incorporated into a computer simulator (MATLAB 7.7 code). Model predictions are compared with data obtained from the literature under the same operating conditions and a good agreement is obtained with a variation ranging from 0.5% to 2.7%. The simulation results show that the production of dimethyl ether is greatly affected by parameters such as temperature, and feed flow rate with optimum yield of DME at a catalyst bed height of 2-4m at a temperature of 557 to 570K.
This study contributes in the existing literature by developing model equations that is used in predicting/simulation of functional parameters for optimum yield of DME. Unlike other works which assume isothermal condition, this study assumes an adiabatic condition and could be adopted for simulation of industrial DME plant.