IJCPS_Vol 04 N 01

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    ELECTROEXTRACTION OF Cd(II) IONS FROM DILUTED SOLUTIONS BY A HYBRID PROCESS COMBINING ELECTRODIALYSIS AND ION-EXCHANGE
    (جامعة الوادي - university of el oued, 2015) Mehellou, Ahmed; Delimi, Rachid; Benredjem, Zahia
    The aim of this work is to highlight the coupling efficiency of electrodialysis and ion-exchange processes for treating water containing heavy metal ions at low concentrations. This hybrid technique called electropermutation (EP) or also continuous electroregeneration. The effects of various physico-chemical parameters on the efficiency of the coupled process such as pH, flow rate of feed solution circulation, density of the applied current and initial concentration of Cd(II) in the solution have been studied. The results obtained show that the removal and transfer of Cd(II) ions decreases with the increase of the flow rate of feed solution and with pH increasing. Furthermore, the increase of the current density enhances the elimination and therefore the transfer of this ion until a density value of 10 mA.cm−2. The EP on resin remains effective until a 224.8 mg.L−1 of Cd(II) ions in the feed solution. Overall, under the optimal operating conditions determined, the hybrid technique of EP removes about 98% of Cd(II) from a dilute solution
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    REDUCTION TOTAL ACID NUMBER (TAN) OF SOME SUDANESE CRUDE OILS BY ZEOLITE AND CLAYS
    (جامعة الوادي - university of el oued, 2015) Osman, Waleed Salih Ibrahim
    The aim of this study was to reduce total acid number (TAN) of some Sudanese crude oils (remove of naphthenic acid) by zeolite and clays. Two sample of zeolite and two samples of clay were used in this study, samples were collected from Hamshcoreep, Glabat and Hatana in east and middle Sudan, and synthetic zeolite was brought from Khartoum refinery. Samples were characterized by X-ray Diffraction (XRD) and the results showed that they are composed of Enstatite, Feldspar, N. Zeolite and synthetic Zeolite. These four samples were used to treat four portions of crude oil (obtained from two types of Sudanese crude oil, Fula blend and Tharjath blend). Total acid number (TAN) of crude oil samples was measured using 484 potentiometric titration instrument (ASTM D644) before and after treatment. One sample of clay, Enstatite, was characterized by Infrared (IR) before and after treatment with crude to insure the presence of acidic material on it after treatment. According to the obtained results, it is evident that Enstatite clay reduced TAN from 1.44mgKOH/g to 0.05mgKOH/g, natural Zeolite reduced TAN from 7.7mgKOH/g to 5.9mgKOH/g, Feldspar reduced TAN from 1.37mgKOH/g to 0.76mgKOH/g, and ZSM-5 Zeolite reduced TAN from 1.98mgKOH/g to 1.57mgKOH/g. In conclusion, all Zeolites and clays used in this study succeeded in decreasing (TAN) of crude oil when they were treated in high temperature (200-220 deg°C.).
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    THE INFLUENCE OF ACID GAS LOADING ON THE PERFORMANCE OF ACID GAS ENRICHMENT (AGE) ABSORBER COLUMN
    (جامعة الوادي - university of el oued, 2015) Mahdipoor, Hamid Reza
    The Claus process is used to recover sulfur from acid gases and therefore, reduce environmental pollution. A lean acid gas feed containing a relatively low concentration of hydrogen sulfide lead to an unstable flame in reaction furnace and also deterioration of the catalyst in reactors due to incomplete combustion of hydrocarbons and soot or carbon deposition. Several alternatives are available to overcome this problem. Acid Gas Enrichment (AGE) is one of these methods using Amine solution to selective absorption of H2S and enrichment of acid gas. In this paper, the influence of acid gas loading in lean Amine on the performance of AGE absorber column is investigated. The achieved results shows this factor is a critical factor in the performance of selective absorption and therefore, more caution should be considered in the simulation of amine stripper