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Operating conditions for the pyrolysis of poly-(ethylene terephthalate) in a conical spouted-bed reactor / Maite Artetxe in Industrial & engineering chemistry research, Vol. 49 N° 5 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2064–2069 Titre : Operating conditions for the pyrolysis of poly-(ethylene terephthalate) in a conical spouted-bed reactor Type de document : texte imprimé Auteurs : Maite Artetxe, Auteur ; Gartzen Lopez, Auteur ; Maider Amutio, Auteur Année de publication : 2010 Article en page(s) : pp. 2064–2069 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Pyrolysis;  Poly-ethylene  terephthalate;  PET;  Conical  reactor  ;  plastic Résumé : Continuous pyrolysis of poly-(ethylene terephthalate) (PET) was performed in a conical spouted-bed reactor. This reactor is especially suitable for this process, because of its excellent hydrodynamic behavior and its versatility. An optimization of the operating conditions has been performed to avoid particle agglomeration and defluidization, given that these are serious problems that hinder plastic waste pyrolysis. Moreover, the influence of temperature in the pyrolysis product distribution was studied in the range of 500−600 °C. PET pyrolysis led to a high yield of gas fraction, a low amount of liquids, a significant yield of solid fraction, and a solid residue that remained in the reactor coating sand particles. The main products obtained are carbon monoxide, carbon dioxide, benzoic acid, and acetaldehyde. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900557c [article] Operating conditions for the pyrolysis of poly-(ethylene terephthalate) in a conical spouted-bed reactor [texte imprimé] / Maite Artetxe, Auteur ; Gartzen Lopez, Auteur ; Maider Amutio, Auteur . - 2010 . - pp. 2064–2069. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2064–2069 Mots-clés : Pyrolysis;  Poly-ethylene  terephthalate;  PET;  Conical  reactor  ;  plastic Résumé : Continuous pyrolysis of poly-(ethylene terephthalate) (PET) was performed in a conical spouted-bed reactor. This reactor is especially suitable for this process, because of its excellent hydrodynamic behavior and its versatility. An optimization of the operating conditions has been performed to avoid particle agglomeration and defluidization, given that these are serious problems that hinder plastic waste pyrolysis. Moreover, the influence of temperature in the pyrolysis product distribution was studied in the range of 500−600 °C. PET pyrolysis led to a high yield of gas fraction, a low amount of liquids, a significant yield of solid fraction, and a solid residue that remained in the reactor coating sand particles. The main products obtained are carbon monoxide, carbon dioxide, benzoic acid, and acetaldehyde. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900557c

Production of light olefins from polyethylene in a two-step process / Maite Artetxe in Industrial & engineering chemistry research, Vol. 51 N° 43 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 13915-13923 Titre : Production of light olefins from polyethylene in a two-step process : Pyrolysis in a conical spouted bed and downstream high-temperature thermal cracking Type de document : texte imprimé Auteurs : Maite Artetxe, Auteur ; Gartzen Lopez, Auteur ; Gorka Elordi, Auteur Année de publication : 2013 Article en page(s) : pp. 13915-13923 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Thermal  cracking  Fluidization  Spouted  bed  Pyrolysis  Production Résumé : A two-step process has been used for the selective production of light olefins by the thermal cracking of high-density polyethylene. The plastic has been continuously fed into a conical spouted-bed reactor (CSBR) operating at 500 °C, which yields 93 wt % of waxes (C21+) and C12―C21 hydrocarbons. The volatile product stream has been cracked downstream in a multitubular (quartz tubes) reactor in the 800-950 °C range, with short residence times (0.016―0.032 s). A yield of 77 wt % of light olefins (C2―C4) has been obtained by operating at 900 °C in the second step. The maximum yields of ethylene, propylene, and butenes are 40.4, 19.5, and 17.5 wt %, respectively. Given the short residence time of the products in the reactor, the yield of aromatics is only 6.2 wt %. The high light olefin yield is due to the excellent performance of both steps. The CSBR allows maximizing the yield of waxes and avoiding defluidization problems. The operating conditions in the multitubular reactor (low concentration of the compounds in the volatile stream and short volatile residence times) are suitable for minimizing secondary reactions. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26593318 [article] Production of light olefins from polyethylene in a two-step process : Pyrolysis in a conical spouted bed and downstream high-temperature thermal cracking [texte imprimé] / Maite Artetxe, Auteur ; Gartzen Lopez, Auteur ; Gorka Elordi, Auteur . - 2013 . - pp. 13915-13923. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 13915-13923 Mots-clés : Thermal  cracking  Fluidization  Spouted  bed  Pyrolysis  Production Résumé : A two-step process has been used for the selective production of light olefins by the thermal cracking of high-density polyethylene. The plastic has been continuously fed into a conical spouted-bed reactor (CSBR) operating at 500 °C, which yields 93 wt % of waxes (C21+) and C12―C21 hydrocarbons. The volatile product stream has been cracked downstream in a multitubular (quartz tubes) reactor in the 800-950 °C range, with short residence times (0.016―0.032 s). A yield of 77 wt % of light olefins (C2―C4) has been obtained by operating at 900 °C in the second step. The maximum yields of ethylene, propylene, and butenes are 40.4, 19.5, and 17.5 wt %, respectively. Given the short residence time of the products in the reactor, the yield of aromatics is only 6.2 wt %. The high light olefin yield is due to the excellent performance of both steps. The CSBR allows maximizing the yield of waxes and avoiding defluidization problems. The operating conditions in the multitubular reactor (low concentration of the compounds in the volatile stream and short volatile residence times) are suitable for minimizing secondary reactions. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26593318