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Design and analysis of experiments for obtaining high bulk density sodium tripolyphosphate / Marcin Banach in Industrial & engineering chemistry research, Vol. 49 N° 24 (Décembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 24 (Décembre 2010) . - pp. 12339-12344 Titre : Design and analysis of experiments for obtaining high bulk density sodium tripolyphosphate Type de document : texte imprimé Auteurs : Marcin Banach, Auteur ; Zygmunt Kowalski, Auteur Année de publication : 2011 Article en page(s) : pp. 12339-12344 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Bulk  density  Design Résumé : The results of experiments for obtaining granulated sodium tripolyphosphate with bulk density adjustable within 1.00-1.05 kg/dm3 and expected content of STPP crystalline phases are presented. The scope of experiments included the identification of factors with statistically significant impacts on the study object and the estimation of response surface. Because of the application of the Plackett-Burman design, 15 input factors could be evaluated regarding their impact significance and insignificant factors could be eliminated. Moreover, the Hartley design enabled the determination of a response surface based on the general regression equation in the form of a second degree polynomial with double interactions. The input factor values, determined on the basis of the prediction profile and desirability function, were used to perform a series of experiments to achieve STPP expected bulk density within the range of 1.00-1.05 kg/dm3. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23691984 [article] Design and analysis of experiments for obtaining high bulk density sodium tripolyphosphate [texte imprimé] / Marcin Banach, Auteur ; Zygmunt Kowalski, Auteur . - 2011 . - pp. 12339-12344. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 24 (Décembre 2010) . - pp. 12339-12344 Mots-clés : Bulk  density  Design Résumé : The results of experiments for obtaining granulated sodium tripolyphosphate with bulk density adjustable within 1.00-1.05 kg/dm3 and expected content of STPP crystalline phases are presented. The scope of experiments included the identification of factors with statistically significant impacts on the study object and the estimation of response surface. Because of the application of the Plackett-Burman design, 15 input factors could be evaluated regarding their impact significance and insignificant factors could be eliminated. Moreover, the Hartley design enabled the determination of a response surface based on the general regression equation in the form of a second degree polynomial with double interactions. The input factor values, determined on the basis of the prediction profile and desirability function, were used to perform a series of experiments to achieve STPP expected bulk density within the range of 1.00-1.05 kg/dm3. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23691984

Tripolyphosphate made from wet-process phosphoric acid with the use of a rotary kiln / Regina Kijkowska in Industrial & engineering chemistry research, Vol. 47 N°18 (Septembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°18 (Septembre 2008) . - p. 6821–6827 Titre : Tripolyphosphate made from wet-process phosphoric acid with the use of a rotary kiln Type de document : texte imprimé Auteurs : Regina Kijkowska, Auteur ; Zygmunt Kowalski, Auteur ; Danuta Pawlowska-Kozinska, Auteur Année de publication : 2008 Article en page(s) : p. 6821–6827 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Tripolyphosphate  Rotary  kiln  Wet-process  phosphoric  acid Résumé : The paper presents results on tripolyphosphate (STPP) preparation with the use of a specially constructed laboratory-scale rotary kiln. The kiln enabled agitation of the material calcined at the temperature range 400−430 °C. Wet-process phosphoric acid WPA-1, taken directly from one of the Polish plants, or WPA-2, imported from Finland, was neutralized with Na2CO3 to obtain a phosphate mixture with the molar ratio Na/P = 5/3. To mimic industrial processing with recycling the product, some of the industrial STPP (form-II) was added and the mixture obtained was fed into the rotary kiln through a vibratory feeder. The calcined product was tripolyphosphate in the crystalline form-II, and that did not depend on concentration of the WPA used, or on the amount of the STPP recycled into the kiln. When a similar phosphate mixture WPA + Na2CO3 + STPP-“recycled” was ignited at 400 °C in a stationary chamber oven, the product obtained was also STPP in form-II. In contrast, when a phosphate mixture WPA + Na2CO3 without STPP-“recycled” was calcined, the phase composition of the product obtained depended on the sort of WPA (WPA-1 or WPA-2) and, in the case of WPA-1, on its concentration. From concentrated WPA-2 the STPP formed more readily than from concentrated WPA-1. Lower H3PO4 concentration and recycling of the STPP into the phosphate mixture, before its ignition, creates favorable conditions for the STPP crystallization. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800412q [article] Tripolyphosphate made from wet-process phosphoric acid with the use of a rotary kiln [texte imprimé] / Regina Kijkowska, Auteur ; Zygmunt Kowalski, Auteur ; Danuta Pawlowska-Kozinska, Auteur . - 2008 . - p. 6821–6827. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°18 (Septembre 2008) . - p. 6821–6827 Mots-clés : Tripolyphosphate  Rotary  kiln  Wet-process  phosphoric  acid Résumé : The paper presents results on tripolyphosphate (STPP) preparation with the use of a specially constructed laboratory-scale rotary kiln. The kiln enabled agitation of the material calcined at the temperature range 400−430 °C. Wet-process phosphoric acid WPA-1, taken directly from one of the Polish plants, or WPA-2, imported from Finland, was neutralized with Na2CO3 to obtain a phosphate mixture with the molar ratio Na/P = 5/3. To mimic industrial processing with recycling the product, some of the industrial STPP (form-II) was added and the mixture obtained was fed into the rotary kiln through a vibratory feeder. The calcined product was tripolyphosphate in the crystalline form-II, and that did not depend on concentration of the WPA used, or on the amount of the STPP recycled into the kiln. When a similar phosphate mixture WPA + Na2CO3 + STPP-“recycled” was ignited at 400 °C in a stationary chamber oven, the product obtained was also STPP in form-II. In contrast, when a phosphate mixture WPA + Na2CO3 without STPP-“recycled” was calcined, the phase composition of the product obtained depended on the sort of WPA (WPA-1 or WPA-2) and, in the case of WPA-1, on its concentration. From concentrated WPA-2 the STPP formed more readily than from concentrated WPA-1. Lower H3PO4 concentration and recycling of the STPP into the phosphate mixture, before its ignition, creates favorable conditions for the STPP crystallization. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800412q