Documents disponibles écrits par cet auteur

Enhancing the throughput of membrane emulsification techniques to manufacture functional particles / Qingchun Yuan in Industrial & engineering chemistry research, Vol. 48 N° 19 (Octobre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 8872–8880 Titre : Enhancing the throughput of membrane emulsification techniques to manufacture functional particles Type de document : texte imprimé Auteurs : Qingchun Yuan, Auteur ; Nita Aryanti, Auteur ; Gemma Gutiérrez, Auteur Année de publication : 2009 Article en page(s) : pp. 8872–8880 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Membrane  emulsification  system  Cross-flow  Rotating  membrane  technology Résumé : Formulation technologies increasingly demand the manufacture of droplets with user-controlled size and size distributions for applications in emulsions, capsules, and semisolid particulates. These are used in various functional consumer products. This paper introduces methods to enhance throughput for two types of membrane emulsification system, using cross-flow and rotating membrane technology. Modification of the interaction between the dispersed phase and the surface of the membrane, the inner wall of the pores (through control of hydrophobicity), pore orientation, and pore shape is demonstrated to increase emulsion droplet productivity. Such methods can also be deployed in the production of capsule materials using emulsion precursors. The possible mechanisms underlying the enhancements are discussed. It is concluded that noncircular pores can offer significant process benefits for the production of uniform droplets and semisolid particulates. It is demonstrated that the droplet formation rate can be doubled through optimization of the orientation of noncircular pores in a rotating membrane process. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801929s [article] Enhancing the throughput of membrane emulsification techniques to manufacture functional particles [texte imprimé] / Qingchun Yuan, Auteur ; Nita Aryanti, Auteur ; Gemma Gutiérrez, Auteur . - 2009 . - pp. 8872–8880. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 8872–8880 Mots-clés : Membrane  emulsification  system  Cross-flow  Rotating  membrane  technology Résumé : Formulation technologies increasingly demand the manufacture of droplets with user-controlled size and size distributions for applications in emulsions, capsules, and semisolid particulates. These are used in various functional consumer products. This paper introduces methods to enhance throughput for two types of membrane emulsification system, using cross-flow and rotating membrane technology. Modification of the interaction between the dispersed phase and the surface of the membrane, the inner wall of the pores (through control of hydrophobicity), pore orientation, and pore shape is demonstrated to increase emulsion droplet productivity. Such methods can also be deployed in the production of capsule materials using emulsion precursors. The possible mechanisms underlying the enhancements are discussed. It is concluded that noncircular pores can offer significant process benefits for the production of uniform droplets and semisolid particulates. It is demonstrated that the droplet formation rate can be doubled through optimization of the orientation of noncircular pores in a rotating membrane process. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801929s

Vacuum evaporation of waste oil-in-water emulsions from a copper metalworking industry / Gemma Gutiérrez 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. 2100–2106 Titre : Vacuum evaporation of waste oil-in-water emulsions from a copper metalworking industry Type de document : texte imprimé Auteurs : Gemma Gutiérrez, Auteur ; José M. Benito, Auteur ; José Coca, Auteur Année de publication : 2009 Article en page(s) : p. 2100–2106 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Vacuum  evaporation  Waste  oil-in-water  Copper  metalworking  industry Résumé : The performance of vacuum evaporation was evaluated for the treatment of waste oil-in-water (O/W) emulsions, one synthetic (Multiroll) and two semisynthetic (Unopol and Divinol), used in a copper metalworking industry. A destabilization/settling pretreatment step using Nalco 71243 (NAL, a quaternary polyamine) as flocculant and CaCl2 and AlCl3·6H2O as coagulants was also investigated. The quality of the final aqueous effluent was evaluated in terms of chemical oxygen demand (COD), turbidity, conductivity, and biological oxygen demand (BOD5). COD reduction greater than 99% was achieved. The pretreatment step did not significantly improve either the evaporation rate or the quality of the condensate. Moreover, evaporation of a totally exhausted Unopol waste emulsion carried out in an industrial falling film evaporator showed good agreement with results obtained at the laboratory scale. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801054d [article] Vacuum evaporation of waste oil-in-water emulsions from a copper metalworking industry [texte imprimé] / Gemma Gutiérrez, Auteur ; José M. Benito, Auteur ; José Coca, Auteur . - 2009 . - p. 2100–2106. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - p. 2100–2106 Mots-clés : Vacuum  evaporation  Waste  oil-in-water  Copper  metalworking  industry Résumé : The performance of vacuum evaporation was evaluated for the treatment of waste oil-in-water (O/W) emulsions, one synthetic (Multiroll) and two semisynthetic (Unopol and Divinol), used in a copper metalworking industry. A destabilization/settling pretreatment step using Nalco 71243 (NAL, a quaternary polyamine) as flocculant and CaCl2 and AlCl3·6H2O as coagulants was also investigated. The quality of the final aqueous effluent was evaluated in terms of chemical oxygen demand (COD), turbidity, conductivity, and biological oxygen demand (BOD5). COD reduction greater than 99% was achieved. The pretreatment step did not significantly improve either the evaporation rate or the quality of the condensate. Moreover, evaporation of a totally exhausted Unopol waste emulsion carried out in an industrial falling film evaporator showed good agreement with results obtained at the laboratory scale. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801054d