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Gabès, Tunisia

Boumnijel I.,Gabes University | Ben Amor H.,Gabes University | Nejib H.,Gabes University | Jeday M.R.,Gabes University | Chekir H.,Tunisian Chemical Group TCG
2015 6th International Renewable Energy Congress, IREC 2015

In recognition of the acute need for accurate and fast technique to be practiced online, a new test procedure for determining the amount of H2S in an industrial effluent has been practiced in this investigation. Hence, original experiments are realized at laboratory and industrial scale. H2S concentration in the industrial gas is deduced by measuring the turbidity involved by the formed Cadmium sulfide (CdS) in the Cadmium acetate solution upon contacting with hydrogen sulfide. Results demonstrated that this method is perfect and can be considered as an economic alternative to the iodometric method actually adopted in the Tunisian Chemical Group (TCG) of Gabes. © 2015 IEEE. Source

Hafdhi F.,Applied Thermodynamic Research Unit UR11ES80 | Khir T.,Applied Thermodynamic Research Unit UR11ES80 | Ben Yahyia A.,Tunisian Chemical Group TCG | Ben Brahim A.,Applied Thermodynamic Research Unit UR11ES80
Energy Conversion and Management

An energetic and exergetic analysis is conducted on a Steam Turbine Power Plant of an existing Phosphoric Acid Factory. The heat recovery systems used in the different parts of the plant are also considered in the study. Mass, energy and exergy balances are established on the main compounds of the plant. A numerical code is established using EES software to perform the calculations required for the thermal and exergy plant analysis considering real variation ranges of the main operating parameters such as pressure, temperature and mass flow rate. The effects of theses parameters on the system performances are investigated. The main sources of irreversibility are the melters, followed by the heat exchangers, the steam turbine generator and the pumps. The maximum energy efficiency is obtained for the blower followed by the heat exchangers, the deaerator and the steam turbine generator. The exergy efficiency obtained for the heat exchanger, the steam turbine generator, the deaerator and the blower are 88%, 74%, 72% and 66% respectively. The effects of High Pressure steam temperature and pressure on the steam turbine generator energy and exergy efficiencies are investigated. © 2015 Elsevier Ltd. All rights reserved. Source

Boumnijel I.,Gabes University | Ben Amor H.,Gabes University | Chekir H.,Tunisian Chemical Group TCG | Hajji N.,Gabes University
Comptes Rendus Chimie

Atmospheric pollution during the manufacturing of Wet process Phosphoric Acid (WPA) is a critical environmental issue. The aim of this study was to examine the absorption of hydrogen sulphide (H2S) emitted by this process into a chlorinated seawater solution under alkaline conditions. Parameters such as pH, sodium hypochlorite (NaOCl) concentration, gas flow rate, operating time and volumetric ratio of the liquid as well as gas phases (Q/Q) were investigated for their effects on H2S absorption efficiency. It was found that sodium hypochlorite is an effective and economical H2S oxidant. Moreover, according to the obtained results, a dose of 1 g Cl2/l and a pH of 11 are recommended. The preferred gas flow rate in this study was equal to 15 l/min. Under these conditions, more than 98% of the hydrogen sulfide was removed, even at relatively high H2S concentrations in industrial gas released from the plants of the Tunisian Chemical Group (GCT). © 2015 Académie des sciences. Source

Boumnijel I.,University of Monastir | Ben Amor H.,University of Monastir | Chtara C.,Tunisian Chemical Group TCG
6th International Conference on Thermal Engineering Theory and Applications

Slurry's filtration is a key stage for the production of phosphoric acid by the dihydrate process. The object of this study is to enhance slurry filtration by addition of perlite during the digestion stage of phosphate rock. Results obtained from a laboratory unit show that it exists an optimum dose of calcinated perlite which evaluated as 17.2 g /kg P 2O 5 in the phosphate rock. The addition of perlite alters the morphology of the gypsum particles, ensures high filtration and washing flows, high P 2O 5 yields by reducing the quantity of P 2O 5 losses spatially the unattacked one. Additional results indicate that the perlite reduces the amount of fluorine (14.7%), aluminum (9%), iron (10.4%) and soluble organic matter (14.5%) whereas involves an undesirable increase of amount of magnesium (18.3%) and silica (19.9%). Source

Boumnijel I.,Gabes University | Ben Amor H.,Gabes University | Chtara C.,Tunisian Chemical Group TCG
International Journal of Mineral Processing

Wet process phosphoric acid (WPA) manufacturing is mainly via the dihydrate process. Phosphogypsum is the by-product. The size distribution of phosphogypsum is a major factor for the economics of the process as it greatly affects filtration efficiency of the acid. The goal of this study is to enhance slurry filtration by adding treated perlite during the phosphate rock digestion stage. This study was carried out using a semi-continuous laboratory scale unit simulating the dihydrate process conditions. Results showed that there was an optimum dose which depended on the type of perlite and it was 86 for raw perlite, 17.2 for calcinated perlite and 8.6 g/kg P2O5 for the activated perlite. The addition of activated perlite ensured high filtration and washing flows and high P2O5 yields through reducing the P2O5 losses especially the unattacked form which consequently improved plant productivity. Perlite proved to be a very effective additive for the growth of gypsum crystals it altered the morphology of the gypsum particles. Additional results indicated that the activated perlite led to decreasing the amount of fluorine (18.8%), aluminum (18.9%), iron (8.2%) and soluble organic matter (16.6%). However, it involved an undesirable increase of magnesium (14.6%) and silica (16.4%) contents. © 2013 Elsevier B.V. Source

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