Titre :	Etude des méthodes d'évaluation et d'inhibition du pouvoir incrustant des eaux dures
Type de document :	texte imprimé
Auteurs :	Hadda Semine ras, Auteur ; Samira Ghizellaoui, Directeur de thèse
Editeur :	جامعة الإخوة منتوري قسنطينة
Année de publication :	2018
Importance :	218 f.
Format :	30 cm.
Note générale :	2 copies imprimées disponibles
Langues :	Français (fre)
Catégories :	Français - Anglais Chimie
Tags :	Entartrage  CaCO3  inhibition  K2HPO4  K 3PO4  tripolyphosphates (STTP)  chronoampérométrie  chronoélectrogravimétrie  impédancemétrie  PCR  RX  Raman  Scaling  K3PO4  chroamperometry  chronoelectrogravimetry  impedancemetry  FCP  تكلس  كربونات الكالسيوم  تثبيط  STTP  K2HPO4كرونوامبيرمترية، كرونوكهروكتلية  المقاومة الكهروكيميائية  الترسيب السريع المراقب  الاشعة السينية  طيف رامان
Index. décimale :	540 Chimie et sciences connexes
Résumé :	The precipitation of an insulating layer of calcium carbonate on the walls of the water distribution of Hamma and Fourchi have serious consequences technique and economic , reduced heat transfer in heat exchangers, limit the efficiency of these devices (valves and taps) by decreasing the flow rate in the pipes. The objective of this study is the inhibition of the scaling capacity of domestic and industrial hard water for Hamma and Fourchi in the presence of K2HPO4 and K3PO4 and STTP. Various processes (electrochemical and chemical) are used. The study of the evaluation of the encrusting power of its waters was carried out by means of chronoamperometry which is based on the reduction of dissolved oxygen and showed that these waters are very scaling. To combat hard water scaling, we have shown that it is sufficient to add low concentrations of inhibitors (K2HPO4, K3PO4, Polyphosphates) in order to obtain a total inhibition of the precipitation of the calcium carbonate. It is possible to determine by the chronoelectrogravimetric (depending on the mass of the calcium carbonate as a function of time) the amount of inhibitor to be added in order to obtain the total inhibition of the calcium carbonate deposition. K2HPO4, K3PO4 and tripolyphosphates (STTP) appear as inhibitors particularly well suited to hard waters. Electrochemical Impedance Spectroscopy (EIS) is used to characterize the adhesion and compactness of calcium carbonate deposition on a metal surface by measuring the high frequency resistance (Rhf) and the high frequency capacitance (Chf). The addition of the three inhibitors (K2HPO4, K3PO4 and tripolyphosphates STTP) resulted in a decrease in high frequency resistance and the high frequency capacity increased. This reflects the porous nature of the deposit and the effectiveness of the scaling inhibitors K2HPO4 and K3PO4 and tripolyphosphates STTP. The Fast Controlled Precipitation test (FCP) developed by LEDION et al. (1997), in the presence of K2HPO4, K3PO4 and tripolyphosphate (STTP) at low concentrations, delayed precipitation of calcium carbonate. The analysis of calcium carbonate deposition by (RX, Raman) changes the morphology of calcite in raw water to a mixture of (calcite, vaterite and aragonite). Among the inhibitors studied, STTP remains the best inhibitor because it acts at a very low concentration by blocking the (germination-growth) of calcium carbonate.
Diplôme :	Doctorat en sciences
En ligne :	../theses/chimie/SEM7263.pdf
Format de la ressource électronique :	pdf
Permalink :	index.php?lvl=notice_display&id=10860

Etude des méthodes d'évaluation et d'inhibition du pouvoir incrustant des eaux dures [texte imprimé] / Hadda Semine ras, Auteur ; Samira Ghizellaoui, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 218 f. ; 30 cm.
2 copies imprimées disponibles

Langues : Français (fre)

Catégories :	Français - Anglais Chimie
Tags :	Entartrage  CaCO3  inhibition  K2HPO4  K 3PO4  tripolyphosphates (STTP)  chronoampérométrie  chronoélectrogravimétrie  impédancemétrie  PCR  RX  Raman  Scaling  K3PO4  chroamperometry  chronoelectrogravimetry  impedancemetry  FCP  تكلس  كربونات الكالسيوم  تثبيط  STTP  K2HPO4كرونوامبيرمترية، كرونوكهروكتلية  المقاومة الكهروكيميائية  الترسيب السريع المراقب  الاشعة السينية  طيف رامان
Index. décimale :	540 Chimie et sciences connexes
Résumé :	The precipitation of an insulating layer of calcium carbonate on the walls of the water distribution of Hamma and Fourchi have serious consequences technique and economic , reduced heat transfer in heat exchangers, limit the efficiency of these devices (valves and taps) by decreasing the flow rate in the pipes. The objective of this study is the inhibition of the scaling capacity of domestic and industrial hard water for Hamma and Fourchi in the presence of K2HPO4 and K3PO4 and STTP. Various processes (electrochemical and chemical) are used. The study of the evaluation of the encrusting power of its waters was carried out by means of chronoamperometry which is based on the reduction of dissolved oxygen and showed that these waters are very scaling. To combat hard water scaling, we have shown that it is sufficient to add low concentrations of inhibitors (K2HPO4, K3PO4, Polyphosphates) in order to obtain a total inhibition of the precipitation of the calcium carbonate. It is possible to determine by the chronoelectrogravimetric (depending on the mass of the calcium carbonate as a function of time) the amount of inhibitor to be added in order to obtain the total inhibition of the calcium carbonate deposition. K2HPO4, K3PO4 and tripolyphosphates (STTP) appear as inhibitors particularly well suited to hard waters. Electrochemical Impedance Spectroscopy (EIS) is used to characterize the adhesion and compactness of calcium carbonate deposition on a metal surface by measuring the high frequency resistance (Rhf) and the high frequency capacitance (Chf). The addition of the three inhibitors (K2HPO4, K3PO4 and tripolyphosphates STTP) resulted in a decrease in high frequency resistance and the high frequency capacity increased. This reflects the porous nature of the deposit and the effectiveness of the scaling inhibitors K2HPO4 and K3PO4 and tripolyphosphates STTP. The Fast Controlled Precipitation test (FCP) developed by LEDION et al. (1997), in the presence of K2HPO4, K3PO4 and tripolyphosphate (STTP) at low concentrations, delayed precipitation of calcium carbonate. The analysis of calcium carbonate deposition by (RX, Raman) changes the morphology of calcite in raw water to a mixture of (calcite, vaterite and aragonite). Among the inhibitors studied, STTP remains the best inhibitor because it acts at a very low concentration by blocking the (germination-growth) of calcium carbonate.
Diplôme :	Doctorat en sciences
En ligne :	../theses/chimie/SEM7263.pdf
Format de la ressource électronique :	pdf
Permalink :	index.php?lvl=notice_display&id=10860