CaC2 production from pulverized coke and CaO at low temperatures — reaction mechanisms / Guodong Li in Industrial & engineering chemistry research, Vol. 51 N° 33 (Août 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 33 (Août 2012) . - pp. 10742-10747 Titre : CaC2 production from pulverized coke and CaO at low temperatures — reaction mechanisms Type de document : texte imprimé Auteurs : Guodong Li, Auteur ; Qingya Liu, Auteur ; Zhenyu Liu, Auteur Année de publication : 2012 Article en page(s) : pp. 10742-10747 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Reaction mechanism Low temperature Production Résumé : CaC2 production with pulverized feeds was proven viable at temperatures about 400 °C lower than that required by the current electric arc technology (2100―2200 °C), which led to development of an autothemal process. For the purpose of reactor design, the reaction mechanism of coke (C) with CaO at temperatures up to 1750 °C is studied in a thermogravimetric analyzer (TGA) coupled with a mass spectrometer (MS). Results indicate that the reaction of C with CaO generally proceeds in three stages, starting at 1460 °C for CaC2 formation, followed by reaction of CaC2 with CaO and by decomposition of CaC2. The second stage is observable only at the complete consumption of C while the third is controlled by surface evaporation of Ca. Reaction behavior at the surface of coke and CaO particles is proposed, including the three-stage reactions and the role of CaC2―CaO eutectics, that promotes CaO diffusion and CaC2 production. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26286448 [article] CaC2 production from pulverized coke and CaO at low temperatures — reaction mechanisms [texte imprimé] / Guodong Li, Auteur ; Qingya Liu, Auteur ; Zhenyu Liu, Auteur . - 2012 . - pp. 10742-10747. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 33 (Août 2012) . - pp. 10742-10747 Mots-clés : Reaction mechanism Low temperature Production Résumé : CaC2 production with pulverized feeds was proven viable at temperatures about 400 °C lower than that required by the current electric arc technology (2100―2200 °C), which led to development of an autothemal process. For the purpose of reactor design, the reaction mechanism of coke (C) with CaO at temperatures up to 1750 °C is studied in a thermogravimetric analyzer (TGA) coupled with a mass spectrometer (MS). Results indicate that the reaction of C with CaO generally proceeds in three stages, starting at 1460 °C for CaC2 formation, followed by reaction of CaC2 with CaO and by decomposition of CaC2. The second stage is observable only at the complete consumption of C while the third is controlled by surface evaporation of Ca. Reaction behavior at the surface of coke and CaO particles is proposed, including the three-stage reactions and the role of CaC2―CaO eutectics, that promotes CaO diffusion and CaC2 production. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26286448

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