Volume 8, No. 1 (2007)
Articles
ANALYSE ET DETERMINATION DES HALOGÉNURES ET DES OXYHALOGENURES PAR CHROMATOGRAPHIE D’ECHANGE D’IONS AVEC DETECTION UV-INDIRECTE
BOULAHJAR R. 12, HADDAD M. EL 23, MAMOUNI R. 24, FECHTALI T. 1, EL ANTRI S.1, AKSSIRA MOHAMED 2, LAZAR S. 1
Analysis and determination of a mixture of halides (F-, Cl-, Br- and I-) and oxyhalides (ClO3- and BrO3-) have been realized by ion exchange chromatography (IEC) with UV-indirect detection mode (IEC-IPD). We have used a stationary phase Metrosep Anion Dual1 Metrohm (150 x 3 mm D.I.), polymeric phase constituted by hydroxyethyle methyacrylate with mobile phase formed by aqueous solution of ortho-phtalic acid as ion developer. In this case, profile separation was presented by effects study; concentration of ortho-phtalique and mobile phase pH. We have also realized the separation of both couples (BrO3-/Br-) and (ClO3-/Cl-). Chromatographic system developed is stable, no perturbation of base line and no interferences of analyzed anions have been occurred.
SYNTHESIS AND CRYSTAL STRUCTURE OF BIS(ACETATO)BIS(2-METHYL-BENZIMIDAZOLE)COPPER(II)
LAMKADDEM A.1, 2, ESSASSI E. M.2, LAZAR S.3*, LÉGER J. M.4, C. JARRY4, GUILLAUMET G.5
The crystal structure of bis(acetato)bis(2-methylbenzimidazole)copper(II) has been determined. The complex is monoclinic, P21/n, with a = 8.128(1) Å, b = 18.577(2) Å, c = 9.524(2) Å and β = 94.92(2)°. The metal is six-coordinated forming with the ligands a slightly distorted octahedron. Eight water molecules were found in the crystal lattice.
SYNTHESES ET EVALUATION DES EFFETS INHIBITEURS DE L’o-PHENYLENEDIACETAMIDE ET DE CERTAINS DERIVES DE LA SERIE BENZIMIDAZOLE
LAMKADDEM A.12*, TOUIR R.3, ESSASSI E. M.2, EBNTOUHAMI M.3
The action of o-phenylenediamine on malonic, phenylacetic, acetic acid and on acetic anhydride was studied. Four products were insulated respectively: 2,2’-bidibenzimidazolylmethane chloride (a), 2-benzylbenzimidazolium chloride (b), 2 méthylbenzimidazolium chloride (c) and o-phenylenediacetamide (d). Their structures are supported by 1HNMR, I.R., and mass spectrometry. Their inhibiting effectiveness was given in decreasing order: a > d > b > c according to electrochemical measurements.
N-BENZYL-N{[3-OXO-3H-ISOBENZOFURAN-(1E)-YLIDENE]PHENYLMETHYL} BENZAMIDE. SYNTHESE ET STRUCTURE CRISTALLINE
VÉRONIQUE RYS1, DENIAU ERIC1, GUY NOWOGROCKI2, AXEL COUTURE1, PIERRE GRANDCLAUDON1*
Acidic treatment of the hydroxyisoindolinone issued from the reaction of N-benzyl protected phthalimide with the anion of N,N dibenzylamide has led to an unexpected rearrangement. The final structural constitution and E-stereochemistry of the resulting phthalide incorporating enelactone and enamide functionalities have been unambiguously established by X-ray diffraction analysis.
ETUDE DE LA BIODEGRADATION DE LA METHYLETHYLCETONE PAR UNE CULTURE MIXTE PRELEVEE DANS LA STATION D'EPURATION D'ELMENIA CONSTANTINE
HASSINA BOUGHERARA, CHEURFI WASSILA, BRAHIM KEBABI*
Pollution by VOC becomes increasingly alarming. The studies of their treatments are numerous; however, the biotreatments of the VOC were recently taken into account only. The study that we carried out showed the aerobic capacity of degradation of the MEK using a mixed culture of micro-organisms taken in the ventilation basins of the sewage treatment plant of El Menia Constantine. The biodegradation products are carbon dioxide and water. The study has been carried out at 30°C in a going interval of concentration in MEK from 500 to 2000 ppm. One noticed an increase of latency time as well as a reduction in the final concentration of the micro-organisms with the increase in the concentration in MEK. A strong reduction of performances of degradation was observed starting from 2000 ppm.
ELECTROCHEMICAL BEHAVIOR OF PARAQUAT ADSORBED ONTO CRYSTALLINE APATITE
M.A. EL MHAMMEDI1, BAKASSE A.2, CHTAINI A.1*
The carbon paste electrode (CPE) has been used to analyze the electrochemical behavior of paraquat (PQ) adsorbed onto synthesized Ca-hydroxyapatite (HAP) in K2SO4 (0.1M). The cyclic voltammetry results obtained were correlated with square wave voltammetry. The influence of variables such as the concentration of paraquat adsorbed onto apatite (PQ/HAP), and the potential scan rate was tested. X-ray diffraction analysis (XRD), Fourier transformed infrared spectroscopy (FTIR) analysis, and inductively coupled plasma-atomic emission spectrometry (ICP, AES) were used for the characterization of the apatite.
EFFECT OF FLUORIDE AND EUGENOL CONCENTRATION ON THE CORROSION BEHAVIOR OF TITANIUM IN ARTIFICIAL SALIVA
KINANI LATIFA, ABDELILAH CHTAINI*
The purpose of this study was to investigate the effect of fluoride and eugenol concentration on the corrosion behavior of titanium (grade 2) alloy in artificial saliva using potentiodynamic polarization and spectroscopy impedance. Chemical analyses of the surface were characterized by SEM. The results showed that either the NaF or the presence of eugenol in medium saliva had a significant influence on the corrosion rate (Jcorr) and polarization resistance (Rp): the Jcorr value increased and Rp decreased in medium containing fluoride, but the presence of eugenol in media improved the corrosion resistance of this alloy.
SYNTHESE ET PROPRIETES COMPLEXANTES DE LA 2-(8,-CHLOROTRIETHYLENEGLYCOLMERCAPTO) IMIDAZO[4,5-b]PYRIDINE
LAZRAK F.1, ESSASSI E. M.1*, RODI Y. KANDRI2, BELLAN J.3
The 2-(8’-chlorotriethyleneglycolmercapto)imidazo[4,5-b]pyridine 2 is prepared by reaction between bis chlorotriethyleneglycol and 2H-imidazo[4,5-b]pyridine-2-thione 1. Compound 2 showed selectivity towards transition metals such as (Zn2+, Cu2+, Cd2+). The sites of complexation are localized by vibrational spectroscopy, the formation constants of the different complexes are determined by UV spectrophotometry.
INVESTIGATION OF THE INHIBITIVE EFFECT OF PYRAZOLO [3, 4-B] PYRIDINE ON CORROSION OF STAINLESS STEEL IN 1 M HCl SOLUTIONS
M.A. EL MHAMMEDI1, FADEL S.2, CHTAINI A.1*, E.M. RAKIB2, KHOUILI M.2
The purpose of this study to investigate the effect of pyrazolo [3-4-b] pyridine on the corrosion inhibition of stainless steel in 1.0M hydrochloric acid (HCl) by using weight loss method, potentiodynamic polarization methods, and electrochemical impedance spectroscopy. It was found that the adsorption of inhibitor could prevent steel from weight loss and the adsorption accorded with the Langmuir adsorption, the corrosion protection could be explained by the adsorption of inhibitor and formation of a protective layer attached to the metal surface.
MODELING OF THE CO2 CAPTURE IN POST-COMBUSTION
AMANN J. M.1, DESCAMPS C.1, KANNICHE M.2, BOUALLOU C.1*
The aim of this study is to assess the energy consumption when an amine process of CO2 capture is integrated downstream from a power plant. We simulated, with the software Aspen plus™, the CO2 capture of two types of power plants: the first one, a Natural Gas Combined Cycle (NGCC) and the other one a Pulverised Coal Fired power plant (CF). For the first type of flue gas, the CO2 concentration is about 5 % mol and about 12 % mol for the second. Two amines solutions were used: monoethanolamine (MEA) and methyldiethanolamine (MDEA). The amine concentration in the aqueous solvent ranges from 10 to 30 % by wt. for MEA and from 30 to 50 % by wt. for MDEA. The CO2 loading in the lean solvent varies from 0.1 to 0.3 mol/mol for MEA and from 0.01 to 0.08 for MDEA. The results show that the more the flue gas is concentrated out of CO2 the less the energy consumption per ton of captured CO2 is high. Thus the CO2 recovery will have a higher impact on the net power output of a NGCC than on the net power output of a CF. Moreover, although MDEA is easier to regenerate than MEA, an aqueous solvent of 50 % by wt. MDEA is not adapted to CO2 absorption. The main explanation is that the solvent flow is higher even with a high concentration in MDEA. Additionally the kinetics of CO2 absorption with MDEA is lesser favorable than with MEA. This means that the installation size will be bigger and thus its capital expenditure more expensive.