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Double - hydrophilic block copolymers as precipitation inhibitors for calcium phosphate and iron(III) / Fu Change in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 8920–8926 Titre : Double - hydrophilic block copolymers as precipitation inhibitors for calcium phosphate and iron(III) Type de document : texte imprimé Auteurs : Fu Change, Auteur ; Zhou Yuming, Auteur ; Xie Hongtao, Auteur Année de publication : 2010 Article en page(s) : pp. 8920–8926 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Hydrophilic  Copolymers  Anhydride Résumé : Novel double-hydrophilic block copolymers, maleic anhydride (MA)−allylpolyethoxy carboxylate (APEC) and maleic anhydride (MA)−ammonium allylpolyethoxy sulfate (APES), were specially designed and synthesized from allyloxy polyethoxy ether (APEO) to inhibit the precipitation of calcium phosphate and iron (III). Structures of APEO, APEC, MA−APEC, APES, and MA−APES were characterized by FT-IR. The study shows that both MA−APEC and MA−APES have significant ability to inhibit the precipitation of calcium phosphate at the dosage of 6 mg/L, approximately showing 99 and 90% inhibition, respectively. The data of the light transmittance of ferrous solutions show that, compared to MA−APES, MA−APEC has superior ability to stabilize iron (III) in solutions. The light transmittance of ferrous solutions is about 23% in the presence of MA−APEC when the dosage is 6 mg/L, whereas in the presence of MA−APES, it is about 31% at a dosage of 12 mg/L. Scanning electron microscopy (SEM) shows that the copolymers influence the morphology of calcium phosphate crystallites. Transmission electron microscopy (TEM) indicates the excellent inhibition results from the formation of core−shell structure. Double-hydrophilic block copolymers of MA−APEC and MA−APES have also been proven to be effective inhibitors of calcium phosphate and iron (III) even at elevated solution temperature, pH, and Ca2+ and Fe2+ concentration. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100395z#afn1 [article] Double - hydrophilic block copolymers as precipitation inhibitors for calcium phosphate and iron(III) [texte imprimé] / Fu Change, Auteur ; Zhou Yuming, Auteur ; Xie Hongtao, Auteur . - 2010 . - pp. 8920–8926. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 8920–8926 Mots-clés : Hydrophilic  Copolymers  Anhydride Résumé : Novel double-hydrophilic block copolymers, maleic anhydride (MA)−allylpolyethoxy carboxylate (APEC) and maleic anhydride (MA)−ammonium allylpolyethoxy sulfate (APES), were specially designed and synthesized from allyloxy polyethoxy ether (APEO) to inhibit the precipitation of calcium phosphate and iron (III). Structures of APEO, APEC, MA−APEC, APES, and MA−APES were characterized by FT-IR. The study shows that both MA−APEC and MA−APES have significant ability to inhibit the precipitation of calcium phosphate at the dosage of 6 mg/L, approximately showing 99 and 90% inhibition, respectively. The data of the light transmittance of ferrous solutions show that, compared to MA−APES, MA−APEC has superior ability to stabilize iron (III) in solutions. The light transmittance of ferrous solutions is about 23% in the presence of MA−APEC when the dosage is 6 mg/L, whereas in the presence of MA−APES, it is about 31% at a dosage of 12 mg/L. Scanning electron microscopy (SEM) shows that the copolymers influence the morphology of calcium phosphate crystallites. Transmission electron microscopy (TEM) indicates the excellent inhibition results from the formation of core−shell structure. Double-hydrophilic block copolymers of MA−APEC and MA−APES have also been proven to be effective inhibitors of calcium phosphate and iron (III) even at elevated solution temperature, pH, and Ca2+ and Fe2+ concentration. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100395z#afn1

Effect of preparation processes on catalytic performance of PtSnNa/ZSM-5 for propane dehydrogenation / Hui Liu in Industrial & engineering chemistry research, Vol. 48 N° 12 (Juin 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5598–5603 Titre : Effect of preparation processes on catalytic performance of PtSnNa/ZSM-5 for propane dehydrogenation Type de document : texte imprimé Auteurs : Hui Liu, Auteur ; Zhou Yuming, Auteur ; Yiwei Zhang, Auteur Année de publication : 2009 Article en page(s) : pp. 5598–5603 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : PtSnNa/ZSM-5  catalyst  Propane  dehydrogenation  BET  surface  area  measurement Résumé : The effect of different preparation processes (impregnation and agglomeration) on the performance and properties of PtSnNa/ZSM-5 catalyst for propane dehydrogenation was studied. Some methods such as BET surface area measurement, catalyst particle mechanical strength, temperature-programmed desoption of ammonia (TPDA), Solid-state 27Al MAS NMR spectroscopy and temperature-programmed reduction of hydrogen (H2-TPR) were used to characterize the catalysts. The channel of ZSM-5 was hardly blocked after adding the binder despite the sequence of agglomeration and impregnation. Meanwhile the Pt metal dispersion on the preimpregnating catalyst with 5 wt % binder was the highest and the acidity was the weakest. The experimental results of propane dehydrogenation reaction showed that the preimpregnating catalyst with 5 wt % binder indicated the optimum reactivity in three catalysts. Therefore, the preimpregnating method in the case of adding a small amount binder was the optimal preparation method of the catalyst, which could replace the conventional preagglomerating method. Finally, a model for the effect of preparation processes on catalytic performance of PtSnNa/ZSM-5 catalyst was proposed. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900311j [article] Effect of preparation processes on catalytic performance of PtSnNa/ZSM-5 for propane dehydrogenation [texte imprimé] / Hui Liu, Auteur ; Zhou Yuming, Auteur ; Yiwei Zhang, Auteur . - 2009 . - pp. 5598–5603. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5598–5603 Mots-clés : PtSnNa/ZSM-5  catalyst  Propane  dehydrogenation  BET  surface  area  measurement Résumé : The effect of different preparation processes (impregnation and agglomeration) on the performance and properties of PtSnNa/ZSM-5 catalyst for propane dehydrogenation was studied. Some methods such as BET surface area measurement, catalyst particle mechanical strength, temperature-programmed desoption of ammonia (TPDA), Solid-state 27Al MAS NMR spectroscopy and temperature-programmed reduction of hydrogen (H2-TPR) were used to characterize the catalysts. The channel of ZSM-5 was hardly blocked after adding the binder despite the sequence of agglomeration and impregnation. Meanwhile the Pt metal dispersion on the preimpregnating catalyst with 5 wt % binder was the highest and the acidity was the weakest. The experimental results of propane dehydrogenation reaction showed that the preimpregnating catalyst with 5 wt % binder indicated the optimum reactivity in three catalysts. Therefore, the preimpregnating method in the case of adding a small amount binder was the optimal preparation method of the catalyst, which could replace the conventional preagglomerating method. Finally, a model for the effect of preparation processes on catalytic performance of PtSnNa/ZSM-5 catalyst was proposed. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900311j

Inhibition of Ca3(PO4)2, CaCO3, and CaSO4 precipitation for industrial recycling water / Fu Change in Industrial & engineering chemistry research, Vol. 50 N° 18 (Septembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 18 (Septembre 2011) . - pp. 10393–10399 Titre : Inhibition of Ca3(PO4)2, CaCO3, and CaSO4 precipitation for industrial recycling water Type de document : texte imprimé Auteurs : Fu Change, Auteur ; Zhou Yuming, Auteur ; Liu Guangqing, Auteur Année de publication : 2011 Article en page(s) : pp. 10393–10399 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Industrial  recycling  water Résumé : In an attempt to control Ca3(PO4)2, CaCO3, and CaSO4 deposits in industrial recycling water systems, an acrylic acid (AA)–allylpolyethoxy carboxylate (APEC) copolymer was examined as a nonphosphorus inhibitor. The synthesized AA–APEC copolymer was characterized by FT-IR. The performance of AA–APEC on inhibition of Ca3(PO4)2, CaCO3, and CaSO4 precipitation was compared with that of current commercial inhibitors. It was shown that AA–APEC exhibited excellent ability to control inorganic minerals, with approximately 82.88% CaSO4 inhibition and 99.89% Ca3(PO4)2 inhibition at levels of 3 and 6 mg/L AA–APEC, respectively. AA–APEC also displayed ability to prevent the formation of CaCO3 scales. Transmission electron microscopy (TEM) images indicated that the outstanding performance of AA–APEC on Ca3(PO4)2 inhibition resulted from a decrease in size of Ca3(PO4)2 solid particles thereby dispersing these particles throughout a fluid, while CaCO3 inhibition was attributed to the formation of ribbon-shaped structures and CaSO4 inhibition resulted from loose CaSO4 crystallites speculated on scanning electron microscopy (SEM) images. The proposed inhibition mechanism suggests the formation of complexes between the side-chain carboxyl groups of AA–APEC and calcium ions on the surface of inorganic minerals, and the excellent solubility of complexes resulted from a number of hydrophilic polyethylene glycol (PEG) segments. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200051r [article] Inhibition of Ca3(PO4)2, CaCO3, and CaSO4 precipitation for industrial recycling water [texte imprimé] / Fu Change, Auteur ; Zhou Yuming, Auteur ; Liu Guangqing, Auteur . - 2011 . - pp. 10393–10399. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 18 (Septembre 2011) . - pp. 10393–10399 Mots-clés : Industrial  recycling  water Résumé : In an attempt to control Ca3(PO4)2, CaCO3, and CaSO4 deposits in industrial recycling water systems, an acrylic acid (AA)–allylpolyethoxy carboxylate (APEC) copolymer was examined as a nonphosphorus inhibitor. The synthesized AA–APEC copolymer was characterized by FT-IR. The performance of AA–APEC on inhibition of Ca3(PO4)2, CaCO3, and CaSO4 precipitation was compared with that of current commercial inhibitors. It was shown that AA–APEC exhibited excellent ability to control inorganic minerals, with approximately 82.88% CaSO4 inhibition and 99.89% Ca3(PO4)2 inhibition at levels of 3 and 6 mg/L AA–APEC, respectively. AA–APEC also displayed ability to prevent the formation of CaCO3 scales. Transmission electron microscopy (TEM) images indicated that the outstanding performance of AA–APEC on Ca3(PO4)2 inhibition resulted from a decrease in size of Ca3(PO4)2 solid particles thereby dispersing these particles throughout a fluid, while CaCO3 inhibition was attributed to the formation of ribbon-shaped structures and CaSO4 inhibition resulted from loose CaSO4 crystallites speculated on scanning electron microscopy (SEM) images. The proposed inhibition mechanism suggests the formation of complexes between the side-chain carboxyl groups of AA–APEC and calcium ions on the surface of inorganic minerals, and the excellent solubility of complexes resulted from a number of hydrophilic polyethylene glycol (PEG) segments. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200051r