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Gypsum scale control by nitrilotrimethylenephosphonic acid / Marina Prisciandaro in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10877–10883 Titre : Gypsum scale control by nitrilotrimethylenephosphonic acid Type de document : texte imprimé Auteurs : Marina Prisciandaro, Auteur ; Emilia Olivieri, Auteur ; Amedeo Lancia, Auteur Année de publication : 2010 Article en page(s) : pp. 10877–10883 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Gypsum--Scale--Control--Nitrilotrimethylenephosphonic--Acid Résumé : In this paper the retardant effect of nitrilotrimethylenephosphonic acid (NTMP) on calcium sulfate dihydrate nucleation kinetics is evaluated by means of an optical technique able to accurately measure the induction period. A laboratory-scale experimental apparatus is used, in which sodium sulfate and calcium chloride are mixed to obtain a supersaturated calcium sulfate dihydrate solution; all experiments are carried out for various values of NTMP concentrations (0.005−0.05 g/L) in solution, while changing the saturation index in the range of 4.04 − 4.82; the temperature was varied in the interval 15−45 °C. Experimentally measured induction times are used to evaluate the interfacial tension (γS) between crystals and mother solution and to estimate the activation energy (Eatt) for precipitation in the presence of NTMP. The measured values of γS and Eatt are compared with those found in the absence of any additive and in the presence of citric acid, showing that NTMP is a very strong retardant for gypsum nucleation. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900253f [article] Gypsum scale control by nitrilotrimethylenephosphonic acid [texte imprimé] / Marina Prisciandaro, Auteur ; Emilia Olivieri, Auteur ; Amedeo Lancia, Auteur . - 2010 . - pp. 10877–10883. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10877–10883 Mots-clés : Gypsum--Scale--Control--Nitrilotrimethylenephosphonic--Acid Résumé : In this paper the retardant effect of nitrilotrimethylenephosphonic acid (NTMP) on calcium sulfate dihydrate nucleation kinetics is evaluated by means of an optical technique able to accurately measure the induction period. A laboratory-scale experimental apparatus is used, in which sodium sulfate and calcium chloride are mixed to obtain a supersaturated calcium sulfate dihydrate solution; all experiments are carried out for various values of NTMP concentrations (0.005−0.05 g/L) in solution, while changing the saturation index in the range of 4.04 − 4.82; the temperature was varied in the interval 15−45 °C. Experimentally measured induction times are used to evaluate the interfacial tension (γS) between crystals and mother solution and to estimate the activation energy (Eatt) for precipitation in the presence of NTMP. The measured values of γS and Eatt are compared with those found in the absence of any additive and in the presence of citric acid, showing that NTMP is a very strong retardant for gypsum nucleation. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900253f

Gypsum scale control by nitrilotrimethylenephosphonic acid / Marina Prisciandaro in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10877–10883 Titre : Gypsum scale control by nitrilotrimethylenephosphonic acid Type de document : texte imprimé Auteurs : Marina Prisciandaro, Auteur ; Emilia Olivieri, Auteur ; Amedeo Lancia, Auteur Année de publication : 2010 Article en page(s) : pp. 10877–10883 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Nitrilotrimethylenephosphonic  acid  Calcium  sulfate  dihydrate  nucleation  kinetics Résumé : In this paper the retardant effect of nitrilotrimethylenephosphonic acid (NTMP) on calcium sulfate dihydrate nucleation kinetics is evaluated by means of an optical technique able to accurately measure the induction period. A laboratory-scale experimental apparatus is used, in which sodium sulfate and calcium chloride are mixed to obtain a supersaturated calcium sulfate dihydrate solution; all experiments are carried out for various values of NTMP concentrations (0.005−0.05 g/L) in solution, while changing the saturation index in the range of 4.04 − 4.82; the temperature was varied in the interval 15−45 °C. Experimentally measured induction times are used to evaluate the interfacial tension (γS) between crystals and mother solution and to estimate the activation energy (Eatt) for precipitation in the presence of NTMP. The measured values of γS and Eatt are compared with those found in the absence of any additive and in the presence of citric acid, showing that NTMP is a very strong retardant for gypsum nucleation. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900253f [article] Gypsum scale control by nitrilotrimethylenephosphonic acid [texte imprimé] / Marina Prisciandaro, Auteur ; Emilia Olivieri, Auteur ; Amedeo Lancia, Auteur . - 2010 . - pp. 10877–10883. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10877–10883 Mots-clés : Nitrilotrimethylenephosphonic  acid  Calcium  sulfate  dihydrate  nucleation  kinetics Résumé : In this paper the retardant effect of nitrilotrimethylenephosphonic acid (NTMP) on calcium sulfate dihydrate nucleation kinetics is evaluated by means of an optical technique able to accurately measure the induction period. A laboratory-scale experimental apparatus is used, in which sodium sulfate and calcium chloride are mixed to obtain a supersaturated calcium sulfate dihydrate solution; all experiments are carried out for various values of NTMP concentrations (0.005−0.05 g/L) in solution, while changing the saturation index in the range of 4.04 − 4.82; the temperature was varied in the interval 15−45 °C. Experimentally measured induction times are used to evaluate the interfacial tension (γS) between crystals and mother solution and to estimate the activation energy (Eatt) for precipitation in the presence of NTMP. The measured values of γS and Eatt are compared with those found in the absence of any additive and in the presence of citric acid, showing that NTMP is a very strong retardant for gypsum nucleation. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900253f

PBTC as an antiscalant for gypsum precipitation / Marina Prisciandaro in Industrial & engineering chemistry research, Vol. 51 N° 39 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 39 (Octobre 2012) . - pp. 12844-12851 Titre : PBTC as an antiscalant for gypsum precipitation : Interfacial tension and activation energy estimation Type de document : texte imprimé Auteurs : Marina Prisciandaro, Auteur ; Emilia Olivieri, Auteur ; Amedeo Lancia, Auteur Année de publication : 2012 Article en page(s) : pp. 12844-12851 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Thermodynamic  properties  Activation  energy  Interface  tension Résumé : The aim of this paper is to measure the induction period for gypsum nucleation when 2-phosphonobutane-1,2,4-tricarboxylic acid (also PBTC, commercial name Bayhibit) is added to a solution as an additive. A well-assessed laser light scattering technique previously devised for the measurement of induction times has been used. The induction period values measured are then used to estimate the values for the interfacial tension between gypsum crystals and the mother solution for three PBTC concentration levels (0.05, 0.10, and 0.50 g/L) at the temperature levels of T = 15, 25, and 35 °C, according to different nucleation mechanisms. Starting from the dependence of induction times on temperature, the activation energy for nucleation is estimated for each tested PBTC concentration, allowing the determination, with an a posteriori analysis, of which is the governing mechanism in gypsum nucleation kinetic, and thus the more reliable interfacial tension values. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26419241 [article] PBTC as an antiscalant for gypsum precipitation : Interfacial tension and activation energy estimation [texte imprimé] / Marina Prisciandaro, Auteur ; Emilia Olivieri, Auteur ; Amedeo Lancia, Auteur . - 2012 . - pp. 12844-12851. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 39 (Octobre 2012) . - pp. 12844-12851 Mots-clés : Thermodynamic  properties  Activation  energy  Interface  tension Résumé : The aim of this paper is to measure the induction period for gypsum nucleation when 2-phosphonobutane-1,2,4-tricarboxylic acid (also PBTC, commercial name Bayhibit) is added to a solution as an additive. A well-assessed laser light scattering technique previously devised for the measurement of induction times has been used. The induction period values measured are then used to estimate the values for the interfacial tension between gypsum crystals and the mother solution for three PBTC concentration levels (0.05, 0.10, and 0.50 g/L) at the temperature levels of T = 15, 25, and 35 °C, according to different nucleation mechanisms. Starting from the dependence of induction times on temperature, the activation energy for nucleation is estimated for each tested PBTC concentration, allowing the determination, with an a posteriori analysis, of which is the governing mechanism in gypsum nucleation kinetic, and thus the more reliable interfacial tension values. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26419241