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Ball mill-assisted dechlorination of flexible and rigid poly(vinyl chloride) in NaOH/EG solution / Tomohito Kameda ; Masahiko Ono ; Guido Grause ; Tadaaki Mizoguchi in Industrial & engineering chemistry research, Vol. 47 n°22 (Novembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°22 (Novembre 2008) . - p. 8619–8624 Titre : Ball mill-assisted dechlorination of flexible and rigid poly(vinyl chloride) in NaOH/EG solution Type de document : texte imprimé Auteurs : Tomohito Kameda, Auteur ; Masahiko Ono, Auteur ; Guido Grause, Auteur ; Tadaaki Mizoguchi, Auteur Année de publication : 2008 Article en page(s) : p. 8619–8624 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Dechlorination  vinyl  chloride  NaOH/EG Résumé : Both flexible and rigid forms of poly(vinyl chloride) (PVC) were effectively dechlorinated in NaOH/ethylene glycol (EG) solution during ball mill pulverization. The high degree of dechlorination obtained was attributed to the increased surface area of the crushed PVC particles and the resulting enhancement of contact between the PVC and dissolved hydroxide ions. The common additives diisononyl phthalate and CaCO3 were easily separated from the PVC bulk during the dechlorination reaction. The reaction proceeded under chemical control, with degrees of dechlorination for both flexible and rigid PVC increasing with temperature with apparent activation energies of 110 and 80 kJ/mol, respectively. This reaction was accurately represented by a modified shrinking-core model. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8006819 [article] Ball mill-assisted dechlorination of flexible and rigid poly(vinyl chloride) in NaOH/EG solution [texte imprimé] / Tomohito Kameda, Auteur ; Masahiko Ono, Auteur ; Guido Grause, Auteur ; Tadaaki Mizoguchi, Auteur . - 2008 . - p. 8619–8624. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°22 (Novembre 2008) . - p. 8619–8624 Mots-clés : Dechlorination  vinyl  chloride  NaOH/EG Résumé : Both flexible and rigid forms of poly(vinyl chloride) (PVC) were effectively dechlorinated in NaOH/ethylene glycol (EG) solution during ball mill pulverization. The high degree of dechlorination obtained was attributed to the increased surface area of the crushed PVC particles and the resulting enhancement of contact between the PVC and dissolved hydroxide ions. The common additives diisononyl phthalate and CaCO3 were easily separated from the PVC bulk during the dechlorination reaction. The reaction proceeded under chemical control, with degrees of dechlorination for both flexible and rigid PVC increasing with temperature with apparent activation energies of 110 and 80 kJ/mol, respectively. This reaction was accurately represented by a modified shrinking-core model. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8006819

Improvement of the benzene yield during pyrolysis of terephthalic acid using a CaO fixed-bed reactor / Shogo Kumagai in Industrial & engineering chemistry research, Vol. 50 N° 11 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp 6594–6600 Titre : Improvement of the benzene yield during pyrolysis of terephthalic acid using a CaO fixed-bed reactor Type de document : texte imprimé Auteurs : Shogo Kumagai, Auteur ; Guido Grause, Auteur ; Tomohito Kameda, Auteur Année de publication : 2011 Article en page(s) : pp 6594–6600 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Pyrolysis  Terephthalic  acid Résumé : Effects of pyrolysis temperature and terephthalic acid (TPA) gas concentration on TPA degradation as a model substance for poly(ethylene terephthalate) (PET) degradation products were investigated with emphasis on benzene yield and decrease of carbonaceous residue. TPA was decarboxylated using a spiral tube reactor filled with CaO. The best results were achieved at 600 °C and TPA gas load of 28 mg L–1, yielding 84% benzene. Of the initial carbon, 29% remained in the reactor, consisting of carbonate and carbonaceous residue. Benzene purity was more than 97 wt % under all reaction conditions. Low TPA gas loads and high gas velocities resulted in good benzene yields and purities because TPA gas deeply penetrated the CaO fixed bed before adsorption. This resulted in lower TPA concentration at the CaO surface, reducing the interference between neighboring TPA molecules and limiting carbonaceous residue formation. DEWEY : 660 ISSN : 088-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102423m [article] Improvement of the benzene yield during pyrolysis of terephthalic acid using a CaO fixed-bed reactor [texte imprimé] / Shogo Kumagai, Auteur ; Guido Grause, Auteur ; Tomohito Kameda, Auteur . - 2011 . - pp 6594–6600. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp 6594–6600 Mots-clés : Pyrolysis  Terephthalic  acid Résumé : Effects of pyrolysis temperature and terephthalic acid (TPA) gas concentration on TPA degradation as a model substance for poly(ethylene terephthalate) (PET) degradation products were investigated with emphasis on benzene yield and decrease of carbonaceous residue. TPA was decarboxylated using a spiral tube reactor filled with CaO. The best results were achieved at 600 °C and TPA gas load of 28 mg L–1, yielding 84% benzene. Of the initial carbon, 29% remained in the reactor, consisting of carbonate and carbonaceous residue. Benzene purity was more than 97 wt % under all reaction conditions. Low TPA gas loads and high gas velocities resulted in good benzene yields and purities because TPA gas deeply penetrated the CaO fixed bed before adsorption. This resulted in lower TPA concentration at the CaO surface, reducing the interference between neighboring TPA molecules and limiting carbonaceous residue formation. DEWEY : 660 ISSN : 088-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102423m

Pyrolysis of mixed plastics in a fluidized bed of hard burnt lime / Guido Grause in Industrial & engineering chemistry research, Vol. 50 N° 9 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5459-5466 Titre : Pyrolysis of mixed plastics in a fluidized bed of hard burnt lime Type de document : texte imprimé Auteurs : Guido Grause, Auteur ; Shotaro Matsumoto, Auteur ; Tomohito Kameda, Auteur Année de publication : 2011 Article en page(s) : pp. 5459-5466 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Fluidized  bed  Fluidization  Plastics  Pyrolysis Résumé : A mixture consisting of 45 wt % polyethylene, 20 wt % polypropylene, 20 wt % polystyrene, and 15 wt % poly( ethylene terephthalate) was pyrolyzed in the presence of steam as well as nitrogen, using a fluidized bed reactor with hard burnt lime (HBL) as bed material. The experiments were carried out at 600 and 700 °C. Unlike soft burnt lime, HBL exhibited good fluidizing properties, with negligible attrition. The impact of HBL on the product distribution and the ability of HBL to support the degradation of PET under certain conditions were investigated. Compared with experiments done in the presence of quartz sand, the gas yield increased, while the wax fraction was significantly reduced. In the presence of HBL, the benzene yield rose sharply due to the decarboxylation of PET. While terephthalic acid was present in the wax fraction derived from experiments with quartz sand, it was not detected as a part of the wax fraction when HBL was used. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24128668 [article] Pyrolysis of mixed plastics in a fluidized bed of hard burnt lime [texte imprimé] / Guido Grause, Auteur ; Shotaro Matsumoto, Auteur ; Tomohito Kameda, Auteur . - 2011 . - pp. 5459-5466. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5459-5466 Mots-clés : Fluidized  bed  Fluidization  Plastics  Pyrolysis Résumé : A mixture consisting of 45 wt % polyethylene, 20 wt % polypropylene, 20 wt % polystyrene, and 15 wt % poly( ethylene terephthalate) was pyrolyzed in the presence of steam as well as nitrogen, using a fluidized bed reactor with hard burnt lime (HBL) as bed material. The experiments were carried out at 600 and 700 °C. Unlike soft burnt lime, HBL exhibited good fluidizing properties, with negligible attrition. The impact of HBL on the product distribution and the ability of HBL to support the degradation of PET under certain conditions were investigated. Compared with experiments done in the presence of quartz sand, the gas yield increased, while the wax fraction was significantly reduced. In the presence of HBL, the benzene yield rose sharply due to the decarboxylation of PET. While terephthalic acid was present in the wax fraction derived from experiments with quartz sand, it was not detected as a part of the wax fraction when HBL was used. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24128668