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Internal treatment of process waters in paper production by dissolved air flotation with newly developed chemicals. 1. laboratory tests / Ruben Miranda in Industrial & engineering chemistry research, Vol. 48 N°4 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - p. 2199–2205 Titre : Internal treatment of process waters in paper production by dissolved air flotation with newly developed chemicals. 1. laboratory tests Type de document : texte imprimé Auteurs : Ruben Miranda, Auteur ; Carlos Negro, Auteur ; Angeles Blanco, Auteur Année de publication : 2009 Article en page(s) : p. 2199–2205 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Inorganic  polyaluminium  salts  Organic  cationic  polyelectrolytes  Dissolved  air  flotation  Chemical  optimization Résumé : New chemicals, based on the synergistic effect between inorganic polyaluminium salts and organic cationic polyelectrolytes, have been tested for the chemical optimization of a dissolved air flotation (DAF) unit, used as internal treatment of process waters in a paper mill based on 100% recovered paper. Laboratory tests have demonstrated that polyamine modifications of the aluminum salts are the most efficient in the removal of contaminants, the combination of a polyaluminium nitrate sulfate salt and a polyamine being the most efficient. This chemical has been studied under different conditions, such as different dosages or in combination with a flocculant for the treatment of waters from different paper grades production, and the results have demonstrated a good performance at laboratory scale. Therefore, a field trial has been recommended for assessing its potential benefits at mill scale, which will be described in a future paper. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801047h [article] Internal treatment of process waters in paper production by dissolved air flotation with newly developed chemicals. 1. laboratory tests [texte imprimé] / Ruben Miranda, Auteur ; Carlos Negro, Auteur ; Angeles Blanco, Auteur . - 2009 . - p. 2199–2205. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - p. 2199–2205 Mots-clés : Inorganic  polyaluminium  salts  Organic  cationic  polyelectrolytes  Dissolved  air  flotation  Chemical  optimization Résumé : New chemicals, based on the synergistic effect between inorganic polyaluminium salts and organic cationic polyelectrolytes, have been tested for the chemical optimization of a dissolved air flotation (DAF) unit, used as internal treatment of process waters in a paper mill based on 100% recovered paper. Laboratory tests have demonstrated that polyamine modifications of the aluminum salts are the most efficient in the removal of contaminants, the combination of a polyaluminium nitrate sulfate salt and a polyamine being the most efficient. This chemical has been studied under different conditions, such as different dosages or in combination with a flocculant for the treatment of waters from different paper grades production, and the results have demonstrated a good performance at laboratory scale. Therefore, a field trial has been recommended for assessing its potential benefits at mill scale, which will be described in a future paper. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801047h

Internal treatment of process waters in paper production by dissolved air flotation with newly developed chemicals. 2. Field trials / Ruben Miranda in Industrial & engineering chemistry research, Vol. 48 N° 7 (Avril 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3672–3677 Titre : Internal treatment of process waters in paper production by dissolved air flotation with newly developed chemicals. 2. Field trials Type de document : texte imprimé Auteurs : Ruben Miranda, Auteur ; Carlos Negro, Auteur ; Angeles Blanco, Auteur Année de publication : 2009 Article en page(s) : pp. 3672–3677 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Inorganic  polyaluminium  salts  Organic  cationic  polyelectrolytes  Dissolved  air  flotation Résumé : New chemicals, based on the synergistic effect between inorganic polyaluminium salts and organic cationic polyelectrolytes, have been tested previously at laboratory-scale, and the most efficient product has been selected for an industrial trial for a dissolved air flotation unit of a paper mill based on 100% recovered paper (part 1 of this work). A polyaluminium nitrate sulfate salt combined with a quaternary polyamine has been evaluated in a long-term industrial trial for assessing its potential benefits. Results indicate that this new chemical is able to improve the removal of contaminants by dissolved air flotation, especially when the contamination load of the waters is high, allowing a further closure of the water circuits. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801826m [article] Internal treatment of process waters in paper production by dissolved air flotation with newly developed chemicals. 2. Field trials [texte imprimé] / Ruben Miranda, Auteur ; Carlos Negro, Auteur ; Angeles Blanco, Auteur . - 2009 . - pp. 3672–3677. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3672–3677 Mots-clés : Inorganic  polyaluminium  salts  Organic  cationic  polyelectrolytes  Dissolved  air  flotation Résumé : New chemicals, based on the synergistic effect between inorganic polyaluminium salts and organic cationic polyelectrolytes, have been tested previously at laboratory-scale, and the most efficient product has been selected for an industrial trial for a dissolved air flotation unit of a paper mill based on 100% recovered paper (part 1 of this work). A polyaluminium nitrate sulfate salt combined with a quaternary polyamine has been evaluated in a long-term industrial trial for assessing its potential benefits. Results indicate that this new chemical is able to improve the removal of contaminants by dissolved air flotation, especially when the contamination load of the waters is high, allowing a further closure of the water circuits. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801826m

Time variations of macrostickies and extractable stickies concentrations in deinking / Donald MacNeil in Industrial & engineering chemistry research, Vol. 49 N° 10 (Mai 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4933–4939 Titre : Time variations of macrostickies and extractable stickies concentrations in deinking Type de document : texte imprimé Auteurs : Donald MacNeil, Auteur ; Ruben Miranda, Auteur ; M. Concepcion Monte, Auteur Année de publication : 2010 Article en page(s) : pp. 4933–4939 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Macrostickies Résumé : The stickies content, both macrostickies and stickies extractable in a solvent, was determined for samples taken at short time intervals from deinking lines, producing deinked pulp for newsprint production. The study was carried out at three mills on different continents, with each having a different source of recycled paper as raw material. The short-term variations in extractable stickies in the incoming raw material were quite extreme, with differences of 100% being seen within hours. Despite this, the final deinked pulp contained fewer sudden variations and had no correlation to the incoming stickies content. While the raw material appeared to affect the incoming stickies content, a well-optimized deinking line was able to buffer the raw material variability, and the final stickies content was more dependent on the deinking process. This result was seen for the two mills examined for this phenomenon, despite a different raw material supply. Macrostickies were found to exhibit the same tendencies, although with smaller and less sudden variations. However, the variations of macrostickies and extractable stickies never correlated, even when both were measured for the same pulp fraction, thus confirming that solvent extraction is not an appropriate method for the determination of macrostickies and is more a reflection of microstickies. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9018098 [article] Time variations of macrostickies and extractable stickies concentrations in deinking [texte imprimé] / Donald MacNeil, Auteur ; Ruben Miranda, Auteur ; M. Concepcion Monte, Auteur . - 2010 . - pp. 4933–4939. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4933–4939 Mots-clés : Macrostickies Résumé : The stickies content, both macrostickies and stickies extractable in a solvent, was determined for samples taken at short time intervals from deinking lines, producing deinked pulp for newsprint production. The study was carried out at three mills on different continents, with each having a different source of recycled paper as raw material. The short-term variations in extractable stickies in the incoming raw material were quite extreme, with differences of 100% being seen within hours. Despite this, the final deinked pulp contained fewer sudden variations and had no correlation to the incoming stickies content. While the raw material appeared to affect the incoming stickies content, a well-optimized deinking line was able to buffer the raw material variability, and the final stickies content was more dependent on the deinking process. This result was seen for the two mills examined for this phenomenon, despite a different raw material supply. Macrostickies were found to exhibit the same tendencies, although with smaller and less sudden variations. However, the variations of macrostickies and extractable stickies never correlated, even when both were measured for the same pulp fraction, thus confirming that solvent extraction is not an appropriate method for the determination of macrostickies and is more a reflection of microstickies. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9018098