Browsing by Author "Hachemi, Messaoud"

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Chemical characterization of sapwood and heartwood of Fraxinus angustifolia growing in Algeria
(Taylor & Francis, 2021) Mazri, Sandra; Benotmane, Benamar; Hachemi, Messaoud; Pranovich, Andrey; Willför, Stefan; Smeds, Annika
The result of this study is the chemical characterization of sapwood (SW) and heartwood (HW) of Fraxinus angustifolia native to Algeria. Lipophilic and hydrophilic extractives were isolated by means of an accelerated solvent extractor (ASE) using hexane and the acetone/water mixture respectively. The acid hydrolysis and methanolysis methods were used to determine cellulose and hemicelluloses contents. The Tappi Standards T 222 and UM 250 allowed Klason and acid-soluble lignin quantification respectively. Alkaline hydrolysis of wood samples followed by HPLC analysis was performed to determine the acetyl groups. The method detailed in TAPPI T 211 (2002) for determining the ash content was used. It was found that the SW and HW of Fraxinus A. had almost similar amounts of the main components, averaging 40.00 wt% cellulose, 28.00 wt% hemicelluloses within 18.00 wt% of xylan, 22.00 wt% lignin, 3% extractives and 0.83 wt% ash. However, the HW contained more triglycerides (0.08 wt%) than the SW (0.02 wt%). On the other hand, mannitol was the most predominant hydrophilic extractive in SW (1.60 wt%) than in HW (1.02 wt%). These findings are useful for practitioners in the paper, biofuel, cosmetics, food, pharmaceutical and chemical industries for the assessment of Fraxinus A. wood chemical treatment parameters
An easy synthesis of thermochromic ethylenes under microwave irradiation
(2003) Villemin, Didier; Hachemi, Messaoud; Hammadi, Mohamed
Thermochromic ethylenes were obtained by the reaction of anthrone with tricyclic ketones or terephthaldehyde in DMF in the presence of potassium ter-butoxide under reflux (8h) or under microwave irradiation (10 min.)
Methane emissions from the Algerian natural gas pipelines transportation: Exploring process to reduce environmental consequences
(Sage, 2018) Louhibi–Bouiri, Mounia; Hachemi, Messaoud
Numerical and experimental investigation of hydraulic fracture using the synthesized PMMA
(Springer, 2021) Khadraoui, Sofiane; Hachemi, Messaoud; Allal, Ahmed; Rabiei, Minou; Arabi, Abderraouf; Khodja, Mohamed; Lebouachera, Seif El Islam; Drouiche, Nadjib
Hydraulic fracturing is a technique used for stimulation of unconventional reservoirs including shale plays. Several parameters, including rock properties, state of stresses, and fracturing fluid characteristics, influence successful design and implementation of a hydraulic fracturing operation. Monitoring of real-time hydraulic fracture initiation and propagation in the field to improve the design parameters is costly. Several hydraulic fracturing laboratory studies have been reported; however, similar to the field operations, real-time observation of the fracturing fluid penetration to the rock sample is not practical throughout the test but the sample can only be inspected post-experiment. In this work, we present the specifications of a through see synthesized polymethyl methacrylate (PMMA) material which was made for the purpose of laboratory experimental hydraulic fracturing testing. The mechanical testing of the PMMA allowed us to obtain the mechanical properties, including tensile and compressive strengths as well as toughness are close to the typical tight samples used in the laboratory for hydraulic fracturing experiments. Hydraulic fracturing tests were performed on a number of cylindrical PMMA samples to investigate the effect of injecting fluid viscosity and flow rate as well as the geometry of the initial crack on fracture breakdown pressure and the characteristics of the propagating fracture. The ability to directly observe the fracture geometry throughout the experiment allowed us to make a good correspondence between the pressure–time curve and the evolution of the fracture geometry. Numerical modeling using ANSYS was performed to run multiple simulations and do sensitivity analysis of different parameters similar to the laboratory experiments. The results also were compared with some of the analytical solutions
Oxidation of azo dye carmoisine (E122) in aqueous solution by heterogeneous catalyst CuO/Al 2 O 3 system
(2021) Bousalah, Djedjiga; Yeddou, Ahmed Réda; Hachemi, Messaoud; Chergui, Abdelmalek; Nadjemi, Boubekeur
Heterogeneous oxidation system for the removal of azo-food dye from aqueous solution was studied in the presence of CuO/Al2O3 catalyst. This catalyst was prepared by impregnation method using a cupric salt solution at pH=5, followed by calcination at 450 °C. The result catalyst was characterized by X-ray Diffraction (XRD) and Scanning Electron Microscopy- Energy Dispersive XRay Spectroscopy (SEM-EDX), where the results confirmed a high crystallinity, good chemical stability of the catalyst used in four consecutive cycles and the presence of the elements (Cu, O, Al) composing the catalyst. Several parameters affecting dye degradation such as: solution pH, H2O2 concentration, catalyst dose, and reaction temperature were investigated. CuO/Al2O3 catalyst offers higher activation efficiencies than the homogeneous Cu2+ ions, as well as good operational stability and efficiently generate HO● in neutral aqueous solutions. Complete decolorization (100 %) of Carmoisine (500 mg/L) was achieved in 240 min at neutral pH
Seasonal characterisation of the local sewage sludge
(Parlar Scientific Publications, 2016) Benoudjit, Fouzia; Benoudjit, Mohamed Amine; Hachemi, Messaoud
Synthesis of new intercalated quinones and their cytotoxic effects on cancer cell lines
(2014) Dridi, Feyrel; Bar, Nathalie; Sainte-Catherine, Odile; Hachemi, Messaoud; Lecouvey, Marc; Villemin, Didier
Naphthoquinones with benzofuran or benzodioxan ring were obtained from dichloronaphthoquinone and were fully characterized. The new benzodioxanes were tested on 4 cancer cells and one of them, a derivative from methyl pyrogallate was found very cytotoxic for cancer cells