Browsing by Author "Gherraf, N."
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Item Drimenin-rich Essential Oils From Hertia Cherifolia Growing In Algeria(Oum-El-Bouaghi University, 2012) Zellagui, A.; Gherraf, N.; Lahouel, M.The hydrodistilled oil from crushed dry leaves of Hertia cherifolia which is endemic to Algeria and Tunisia collected from Ain Fekroun (Oum el Bouaghi, Algeria) were analyzed by gas chromatography-mass spectrometry to afford 36 components accounting for 99.3% of the total oil. the major components were found to be: Drimenin (67.5%), 1,2-Di(2-pyridinyl)-1,2-ethanediol (11.2 %), globulol(1.7 %), Cycloheptane, 4-methylene-1-methyl-2-(2-methyl-1-propen-1-yl)-1-vinyl- (1.5 %).Item Interaction parameter estimation in liquid–liquid phase equilibrium modeling using stochastic and hybrid algorithms(Elsevier, 2012) Kabouchea, A.; Boultif, A.; Abidib, A.; Gherraf, N.Metaheuristic methods Simulated annealing (SA) and Genetic algorithm (GA) combined with hybrid functions were investigated to estimate interactions parameters in liquid–liquid phase equilibrium systems. The Rastrigin and Rosenbrock functions with high number of variables were used as test functions to compare the performance of each algorithm. The experimental ternary LLE data for extraction of alcohol with dichloromethane (and diethyl ether) were considered in the NRTL and UNIQUAC activity coefficient model. The interaction parameters were carried out taking into account the closure equation. As a main conclusion, Hybrid algorithms have showed the best performance to estimate the interaction parameters comparatively to stochastic and deterministic algorithmsItem Recovery of nickel and copper from metal finishing hydroxide sludge by kinetic acid leaching(2016) Salhi, R.; Boudjouada, M.; Messikh, S.; Gherraf, N.The aim of the present work was the recovery of nickel and copper from metal finishing hydroxide sludge by kinetic acid leaching. The study was divided into two main parts: First, a kinetic model of precipitate leaching with the presence of acid was developed and subjected to theoretical approach so as to determine optimal leaching conditions (pH and time). Next, the study was conducted experimentally on pure metals hydroxides and then on electroplating sludges. The leaching operation was performed at atmospheric pressure with constant stirring. pH and solubility versus time at different temperature values and different amounts of sludge were carried out. The resulting filtrate was found to contain more than 99% of nickel and copper.Item Role of hydroxypropylmethylcellulose (HPMC 4000) in the protection of the polymorphs of piroxicam extended release tablets(Springer, 2013) Merah, A.; Abidi, A.; Chaffai, N.; Bataille, B.; Gherraf, N.The present study deals with the influence of hydroxypropylmethylcellulose 4000 in the protection of Piroxicam polymorphs which could appear during the processes of formulation of extended release tablets. The physico-chemical tests and the dissolution profiles of polymorphs and tablets showed that the metolose incorporated in the tablets at a rate equivalent to 5% could possibly act doubly; initially by protecting the piroxicam polymorphism transition (form II) during compression, then modulating its in vitro release (extended release).Item Steel corrosion inhibition by bupleurum lancifolium (Apiaceae) extract in acid solution(Springer, 2014) Benahmed, M.; Selatnia, I.; Achouri, A.; Laouer, H.; Gherraf, N.; Akkal, S.The ethyl acetate extract of the aerial parts of Bupleurum lancifolium (Apiaceae) is tested as corrosion inhibitor of carbon steel (API 5L Gr B) in 1.0 M HCl and 0.5 M H2SO4 solutions using weight loss measurement, electrochemical impedance spectroscopy and potentiodynamic polarization techniques. The results revealed that the corrosion inhibition efficiency increases with increasing extract concentration. Potentiodynamic polarization curves indicated that the plant extract behaves as a mixed-type inhibitor. The adsorption of inhibitor on carbon steel surface was found to follow Langmuir isotherm. The effect of temperature on the corrosion behavior of API 5L Gr B steel in acid solutions with and without plant extract was studied in the range 293–333 K. Surface analyses via scanning electron microscope shows a significant improvement on the surface morphology of the steel. Keywords Corrosion inhibition Carbon steel Adsorption Bupleurum lancifolium