Publications Internationales

Permanent URI for this collectionhttps://dspace.univ-boumerdes.dz/handle/123456789/13

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Author: search.filters.author.Hamada, B.Subject: search.filters.subject.Extraction

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    Extractive dearomatization, denitrification and desulfurization of gas oil fractions by a mixed extractant of N,N-methylpyrrolidone, N,N-dimethylformamide and ethylene glycol via microwave radiations
    (Taylor & Francis, 2019) Mesdour, Souad; Boufades, Djamila; Moussiden, A.; Hamada, B.
    In an attempt to develop alternative process that meet the prescribed levelsand green-technology criteria in gas-oil refining, N,N-methylpyrrolidone(NMP), dimethylformamide (DMF) mixed solvents under microwave-radiations (MW) were tested for the gas-oil desulfurization (EDS), denitrifica-tion (EDN) and dearomatization (EDA). In optimal conditions the gas-oilEDS-efficiency via MW can reach as high as 99.1% within 5 min at 500W inthree stages, which is much higher than EDS without MW (88.5% within15 min) or than those of ionic liquids. The NMP/DMF/EG can be reused formulti-cycles before being regenerated by adsorption method. This study willprovide useful information for future industrial application
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    Liquid–liquid extraction and quantitative determination of tungsten (VI) using macrocyclic reagent (DB-18-C-6) as a thiocyanate complex [WO (SCN)5]2
    (Taylor & Francis, 2014) Nabiev, M.; Hamada, B.; Nabieva, A. M.; Amrane, A.; Nasrallah, N.; Saoud, A.
    In recent years, the extraction using crown ethers has reached a resounding success in different scientific and technical fields. In this work, the authors report the results of the main steps of extraction and determination (proportioning) of the tungsten ion (VI) using a chloroformed solution of crown ether. The dibenzo–18–C-6(2,3,11,12-dibenzo-1,4,7,10,13,16-hexaoxacyclooctadeca- 2,11-diene according to the IUPAC systematic nomenclature). The identification and quantification of W(VI) using the absorption spectrum, the influence of the necessary reagents, the needed acidity level for complete extraction and complexation of W (VI) using a crown ether, and the influence of multivalent metal ions were examined, considering that the sensitivity, selectivity, and detection limits have been determined. This system obeys Beer’s law in the range of 0.18–18.3 lgcm 3of tungsten with a molar absorption of 1.6 104 mol 1 cm 1 at 415nm and the detection, quantification limits were, respectively, equal to 0.7–1.8 lgcm 3. The developed method was applied for the extraction of W(VI) in the high speed steel (HSS): HS2–9-1–8 containing 2% W, 9% Mo, 1% V, and 8% C