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Characteristics of deposits formed in cyclones in commercial RFCC reactor / Sung Won Kim in Industrial & engineering chemistry research, Vol. 51 N° 30 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 30 (Août 2012) . - pp. 10238-10246 Titre : Characteristics of deposits formed in cyclones in commercial RFCC reactor Type de document : texte imprimé Auteurs : Sung Won Kim, Auteur ; Ju Wook Lee, Auteur ; Cheol Joong Kim, Auteur Année de publication : 2012 Article en page(s) : pp. 10238-10246 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Reactor  Cyclone Résumé : Deposits in a commercial RFCC reactor were characterized using an analytical approach. Further characterization of deposits on the reactor cyclone, which are one of the primary problems causing abnormal shut-down of RFCC, was carried out in order to understand the formation mechanism of the deposit. The deposits in the reactor consist of hydrocarbon and inorganic matter, compositions of which are well matched with the RFCC catalyst. In a longitudinal analysis of a sample reflecting age, H/ C atomic ratio decreases slightly with increased aging time in inner regions and has high value at the surface region, which is a relatively fresh deposit. The particles, surrounded by carbonaceous matter, and amorphous carbonaceous matter are observed through surface micrographs. Aromatic compounds and nano- and microcatalyst fines contribute to the formation of deposits. Micro- and nanostructure of the deposit is amorphous or very weakly ordered. The H/C atomic ratios of samples with different ages, over 90 days, do not change with aging and are matched with a variation of feed API. Possible mechanisms for the deposit formation and its reducing methods are proposed. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26201441 [article] Characteristics of deposits formed in cyclones in commercial RFCC reactor [texte imprimé] / Sung Won Kim, Auteur ; Ju Wook Lee, Auteur ; Cheol Joong Kim, Auteur . - 2012 . - pp. 10238-10246. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 30 (Août 2012) . - pp. 10238-10246 Mots-clés : Reactor  Cyclone Résumé : Deposits in a commercial RFCC reactor were characterized using an analytical approach. Further characterization of deposits on the reactor cyclone, which are one of the primary problems causing abnormal shut-down of RFCC, was carried out in order to understand the formation mechanism of the deposit. The deposits in the reactor consist of hydrocarbon and inorganic matter, compositions of which are well matched with the RFCC catalyst. In a longitudinal analysis of a sample reflecting age, H/ C atomic ratio decreases slightly with increased aging time in inner regions and has high value at the surface region, which is a relatively fresh deposit. The particles, surrounded by carbonaceous matter, and amorphous carbonaceous matter are observed through surface micrographs. Aromatic compounds and nano- and microcatalyst fines contribute to the formation of deposits. Micro- and nanostructure of the deposit is amorphous or very weakly ordered. The H/C atomic ratios of samples with different ages, over 90 days, do not change with aging and are matched with a variation of feed API. Possible mechanisms for the deposit formation and its reducing methods are proposed. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26201441

Formation and characterization of deposits in cyclone dipleg of a commercial residue fluid catalytic cracking reactor / Sung Won Kim 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. 14279-14288 Titre : Formation and characterization of deposits in cyclone dipleg of a commercial residue fluid catalytic cracking reactor Type de document : texte imprimé Auteurs : Sung Won Kim, Auteur ; Ju Wook Lee, Auteur ; Jae Suk Koh, Auteur Année de publication : 2013 Article en page(s) : pp. 14279-14288 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Reactor  Fluid  catalytic  cracking  Cyclone Résumé : Deposits in the cyclone dipleg of a commercial residue fluid catalytic cracking (RFCC) reactor, which are one of the primary problems causing abnormal shut-down of RFCC, were characterized using an analytical approach in order to understand the formation mechanism of the deposit. The main components of the deposits are hydrocarbons and a high portion of inorganic matter, reflecting dipleg conditions with particle flow. The deposit consists of two parts of massive bulk matter which are mainly pure Sb metal and catalyst particles surrounded by filamentous cokes and lumps of carbonaceous matters. Nickel nanopowders on the catalyst surface and from heavy oil in vapor phase catalyze the filament coke, which accelerate the increase in the amount of deposits by filtering heavy oil droplets. The Sb metals, originated from injected Ni passivator in the riser, contribute largely to deposit formation, and this is validated by a simulation of RFCC conditions and a calculation of cyclone collection efficiency. Possible mechanisms for the deposit formation and methods for the reduction of the deposits are proposed. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26593355 [article] Formation and characterization of deposits in cyclone dipleg of a commercial residue fluid catalytic cracking reactor [texte imprimé] / Sung Won Kim, Auteur ; Ju Wook Lee, Auteur ; Jae Suk Koh, Auteur . - 2013 . - pp. 14279-14288. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 14279-14288 Mots-clés : Reactor  Fluid  catalytic  cracking  Cyclone Résumé : Deposits in the cyclone dipleg of a commercial residue fluid catalytic cracking (RFCC) reactor, which are one of the primary problems causing abnormal shut-down of RFCC, were characterized using an analytical approach in order to understand the formation mechanism of the deposit. The main components of the deposits are hydrocarbons and a high portion of inorganic matter, reflecting dipleg conditions with particle flow. The deposit consists of two parts of massive bulk matter which are mainly pure Sb metal and catalyst particles surrounded by filamentous cokes and lumps of carbonaceous matters. Nickel nanopowders on the catalyst surface and from heavy oil in vapor phase catalyze the filament coke, which accelerate the increase in the amount of deposits by filtering heavy oil droplets. The Sb metals, originated from injected Ni passivator in the riser, contribute largely to deposit formation, and this is validated by a simulation of RFCC conditions and a calculation of cyclone collection efficiency. Possible mechanisms for the deposit formation and methods for the reduction of the deposits are proposed. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26593355