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Preparation of uniform microcapsules containing 1-octanol for caprolactam extraction / Xingchu Gong in Industrial & engineering chemistry research, Vol. 48 N° 9 (Mai 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4507–4513 Titre : Preparation of uniform microcapsules containing 1-octanol for caprolactam extraction Type de document : texte imprimé Auteurs : Xingchu Gong, Auteur ; Yangcheng Lu, Auteur ; Zhixi Qian, Auteur Année de publication : 2009 Article en page(s) : pp. 4507–4513 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Polysulfone  microcapsules  1-octanol  Coaxial  microchannel  N2  gas  Caprolactam  extraction Résumé : This paper presents a novel method to prepare uniform polysulfone (PSF) microcapsules that contain 1-octanol to prevent emulsification when pure 1-octanol is used as the solvent. In this method, a coaxial microchannel device was designed and N2 gas was introduced to control the drop size of polymer solution. Uniform microcapsules were successfully prepared and the diameter decreased linearly with the increase of the N2 flow rate. The pore volume and 1-octanol loading ratio could be controlled by changing the PSF content in polymer solution. The maximum loading of 1-octanol was 6.98 g/g PSF when the pore volume was 8.28 mL/g. The extraction capacity of the prepared microcapsules was determined, and it was found that the uptake of caprolactam was mainly influenced by the 1-octanol mass fraction in microcapsules, because the PSF shell did not adsorb much caprolactam. A maximum uptake of 58.8 mg caprolactam/g microcapsule was reached. The extraction kinetics of the prepared microcapsules also was determined. It was determined that the mass-transfer rate was determined by inner diffusion. The apparent diffusion coefficient of 9.1 × 10−11 m2/s was obtained. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900046u [article] Preparation of uniform microcapsules containing 1-octanol for caprolactam extraction [texte imprimé] / Xingchu Gong, Auteur ; Yangcheng Lu, Auteur ; Zhixi Qian, Auteur . - 2009 . - pp. 4507–4513. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4507–4513 Mots-clés : Polysulfone  microcapsules  1-octanol  Coaxial  microchannel  N2  gas  Caprolactam  extraction Résumé : This paper presents a novel method to prepare uniform polysulfone (PSF) microcapsules that contain 1-octanol to prevent emulsification when pure 1-octanol is used as the solvent. In this method, a coaxial microchannel device was designed and N2 gas was introduced to control the drop size of polymer solution. Uniform microcapsules were successfully prepared and the diameter decreased linearly with the increase of the N2 flow rate. The pore volume and 1-octanol loading ratio could be controlled by changing the PSF content in polymer solution. The maximum loading of 1-octanol was 6.98 g/g PSF when the pore volume was 8.28 mL/g. The extraction capacity of the prepared microcapsules was determined, and it was found that the uptake of caprolactam was mainly influenced by the 1-octanol mass fraction in microcapsules, because the PSF shell did not adsorb much caprolactam. A maximum uptake of 58.8 mg caprolactam/g microcapsule was reached. The extraction kinetics of the prepared microcapsules also was determined. It was determined that the mass-transfer rate was determined by inner diffusion. The apparent diffusion coefficient of 9.1 × 10−11 m2/s was obtained. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900046u