Documents disponibles écrits par cet auteur

Polymeric branched flocculant effect on the flocculation process of pulp suspensions in the papermaking industry / Angeles Blanco in Industrial & engineering chemistry research, Vol. 48 N° 10 (Mai 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 4826–4836 Titre : Polymeric branched flocculant effect on the flocculation process of pulp suspensions in the papermaking industry Type de document : texte imprimé Auteurs : Angeles Blanco, Auteur ; Elena Fuente, Auteur ; M. Concepcion Monte, Auteur Année de publication : 2009 Article en page(s) : pp. 4826–4836 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Cationic  polyacrylamides  Pulp  suspensions  Floc  properties  Focused  beam  reflectance  measurement Résumé : This paper presents the effect of the structure of cationic polyacrylamides (CPAMs) on flocculation of pulp suspensions and floc properties. A focused beam reflectance measurement (FBRM) probe was used to monitor flocculation, deflocculation, and reflocculation processes in real time. To carry out the study, 1% elemental chlorine free (ECF) eucalyptus kraft pulp containing 20% ground calcium carbonate (GCC) was used. Results show that the effect of the CPAM structure depends on charge density and polymer dose. Floc size does not always decrease with branching degree, whereas floc stability and reflocculation ability increased when highly charged and branched CPAM was used. These findings indicate that the use of highly branched CPAMs with very high molecular weight is very promising as a retention aid method to improve the papermaking process. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8011837 [article] Polymeric branched flocculant effect on the flocculation process of pulp suspensions in the papermaking industry [texte imprimé] / Angeles Blanco, Auteur ; Elena Fuente, Auteur ; M. Concepcion Monte, Auteur . - 2009 . - pp. 4826–4836. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 4826–4836 Mots-clés : Cationic  polyacrylamides  Pulp  suspensions  Floc  properties  Focused  beam  reflectance  measurement Résumé : This paper presents the effect of the structure of cationic polyacrylamides (CPAMs) on flocculation of pulp suspensions and floc properties. A focused beam reflectance measurement (FBRM) probe was used to monitor flocculation, deflocculation, and reflocculation processes in real time. To carry out the study, 1% elemental chlorine free (ECF) eucalyptus kraft pulp containing 20% ground calcium carbonate (GCC) was used. Results show that the effect of the CPAM structure depends on charge density and polymer dose. Floc size does not always decrease with branching degree, whereas floc stability and reflocculation ability increased when highly charged and branched CPAM was used. These findings indicate that the use of highly branched CPAMs with very high molecular weight is very promising as a retention aid method to improve the papermaking process. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8011837

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