Production de poyethyléne haute densité au niveau du complexe pétrochimique Polymed CP2K –Skikda/Analyse des problémes liés à l’hydrogéne

In this work, we have studied the process of treatement the raw materials input into the production of high density polyethylene (HDPE). The problems rencountered during the production of the latter and the solutions proposed to overcome these difficulties will also be written in this manuscript. These problems are particularly associated with hydrogen, the degree of purity and heating of which are considered insufficient with regard to the optimum conditions for manufacturing HDPE. Two solutions are envisaged which relate to:  Improving the treatment applied to hydrogen using other purification techniques. - Improving of the heating of hydrogen by replacing the preheater 360-401 by a fiscal - exchanger calenders the E100. Keywords: High density polyethylene, polymed petrochemical complex, Hydrogen, adsorption, membrane, exchanger.

Fabrication de deux comprimés pelliculés : l’Hydroxychloroquine et l’Azithromycine et implications dans le traitement du Covid-19/Application en pédiatrie dans la wilaya d’AnnabaAlgérie

In this work, we investigated the manufacture of two film-coated tablets Azithromycin and Hydroxychloroquine. These two tablets were applied in the treatment of Covid-19 in Algeria. The effectiveness of these drugs in children has been tested through an investigation carried out at the "Sainte-Thérèse" pediatric clinic and at Malek-Ben Nabi- primary school- Annaba. The available clinical data show that the combination of Azithromycin and Hydroxychloroquine causes harmful effects in sick children in most cases; on the other hand the use of a single drug either Azitromycin or Hdroxychloroquine promotes the cure of the disease. Keywords: film-coated tablet, COVID-19, pediatrics, Azithromycin, Hydroxychloroquine.

Traitement et contrôle de qualité des eaux de refroidissement des barres d’acier au niveau de l’aciérie à oxygène (ACO1) du complexe sidérurgique d’El Hadjar

Cooling operations are widely used in most industries, especially in the chemical and petrochemical industry. Generally, the choice of cooling waters is determined by the required quantities and quality of these waters. This is why the water used undergoes a series of treatments, intended to improve its quality in order to avoid certain numbers of problems. In this context, we carried out the monitoring, treatment and control of the cooling water used in the oxygen steelworks No. 1 (ACO1) of the El Hadjar steel complex.

Etude qualitative des eaux d'approvisionnement au niveau de l’ancienne et la nouvelle usine à eau du complexe Sidérurgique El Hadjar

In industry, water is used in various applications such as irrigation, cooling etc. These applications affect the quality of the latter and to extend the life of industrial installations and maximize production, regular monitoring of water quality must be carried out and adequate treatment must be applied. As part of this work, we carried out a qualitative study of the waters supplying the El Hadjar complex by analyzing these physico-chemical parameters before and after treatment at the old and new water plant. We also monitored the water treatment in the old and new water factory.

Décoloration du bleu de méthylène par un procédé d’oxydation avancé <>

This study focuses on the discoloration of methylene blue present in an aqueous solution by the Galvano-Fenton process. The latter allows the in situ generation of ferrous catalyst and hydroxyl radicals through the injection of hydrogen peroxide in an acid medium and the insertion of a galvanic cell composed of a copper cathode and an iron anode in a batch reactor containing the target dye. Indeed, the corrosion of the anode will feed the medium with ferric ions that will react with hydrogen peroxide to produce HO . ions, Which are able to oxidize any organic pollutant and include methylene blue. The discoloration of methylene blue by the Galvano-Fenton process depends on the experimental conditions, such as the concentration of H 2 O 2 , the acidity of the medium, the temperature, the stirring speed, and the pre-immersion time. These parameters have a positive effect on the elimination of methylene blue. While increasing the spacing between the electrodes of the galvanic cell and increasing the concentration of the target dye inhibit the fading of our dye,.  Under the following experimental conditions: [H 2 O 2 ] = 0.1 M and [BM] = 10 mg/l, pH = 2, T = 45 °C, Va = 400 tr/min, a pre-immersion time of 20 min, and a gap of 1 cm between the electrodes, the discoloration rate obtained is 100% after 10 min of treatment.  The kinetic study of the methylene blue discoloration reaction by the Galvano-Fenton process showed pseudo-first-order kinetics. Keywords: Methylene Blue, Advanced Oxidation Processes, Discoloration, Galvano-Fenton, Hydroxyl Radicals.