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Influence of nonbasic nitrogen compounds and condensed aromatics on coker gas oil catalytic cracking and their characterization / Ze-kun Li in Industrial & engineering chemistry research, Vol. 50 N° 15 (Août 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp 9415–9424 Titre : Influence of nonbasic nitrogen compounds and condensed aromatics on coker gas oil catalytic cracking and their characterization Type de document : texte imprimé Auteurs : Ze-kun Li, Auteur ; Jin-sen Gao, Auteur ; Gang Wang, Auteur Année de publication : 2011 Article en page(s) : pp 9415–9424 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Nonbasic  nitrogen  compounds  Coker  gas  oil  catalytic Résumé : Contrastive fluid catalytic cracking (FCC) performances of coker gas oil (CGO) narrow-boiling fractions before and after HCl aqueous solution and furfural further treatment were investigated. Nonbasic nitrogen compounds and condensed aromatics in test oil samples were identified by negative-ion electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI FT-ICR MS) and gas chromatography and mass spectrometry (GC–MS), respectively. The results show that basic nitrogen compounds mainly retard the feed conversion and liquid products due to their interaction with Brønsted acid sites or Lewis acid sites during catalytic cracking reactions, while the nonbasic nitrogen compounds and condensed aromatics are hard to convert into smaller molecules, just resulting in obvious effects on yields of gasoline and diesel. Moreover, nonbasic nitrogen compounds with single N species are dominant in CGO, identified as carbazoles, cycloalkyl-carbazoles, benzocarbazoles, and cycloalkyl-benzocarbazoles. Condensed aromatics include three to four rings of large dynamic size, usually presented as chrysene, pyrene, and phenanthrene. These compounds deposit on the surface of catalysts and thus redundant coke is formed; consequently, entrances for other hydrocarbons into acid centers are jammed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2003973 [article] Influence of nonbasic nitrogen compounds and condensed aromatics on coker gas oil catalytic cracking and their characterization [texte imprimé] / Ze-kun Li, Auteur ; Jin-sen Gao, Auteur ; Gang Wang, Auteur . - 2011 . - pp 9415–9424. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp 9415–9424 Mots-clés : Nonbasic  nitrogen  compounds  Coker  gas  oil  catalytic Résumé : Contrastive fluid catalytic cracking (FCC) performances of coker gas oil (CGO) narrow-boiling fractions before and after HCl aqueous solution and furfural further treatment were investigated. Nonbasic nitrogen compounds and condensed aromatics in test oil samples were identified by negative-ion electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI FT-ICR MS) and gas chromatography and mass spectrometry (GC–MS), respectively. The results show that basic nitrogen compounds mainly retard the feed conversion and liquid products due to their interaction with Brønsted acid sites or Lewis acid sites during catalytic cracking reactions, while the nonbasic nitrogen compounds and condensed aromatics are hard to convert into smaller molecules, just resulting in obvious effects on yields of gasoline and diesel. Moreover, nonbasic nitrogen compounds with single N species are dominant in CGO, identified as carbazoles, cycloalkyl-carbazoles, benzocarbazoles, and cycloalkyl-benzocarbazoles. Condensed aromatics include three to four rings of large dynamic size, usually presented as chrysene, pyrene, and phenanthrene. These compounds deposit on the surface of catalysts and thus redundant coke is formed; consequently, entrances for other hydrocarbons into acid centers are jammed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2003973

Retardation effect of basic nitrogen compounds on hydrocarbons catalytic cracking in coker gas oil and their structural identification / Ze-kun Li in Industrial & engineering chemistry research, Vol. 50 N° 7 (Avril 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 4123-4132 Titre : Retardation effect of basic nitrogen compounds on hydrocarbons catalytic cracking in coker gas oil and their structural identification Type de document : texte imprimé Auteurs : Ze-kun Li, Auteur ; Gang Wang, Auteur ; Quan Shi, Auteur Année de publication : 2011 Article en page(s) : pp. 4123-4132 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Gas  oil  Catalytic  cracking Résumé : The basic nitrogen compounds in coker gas oil (CGO) narrow fractions were enriched, and their influences on hydrocarbons during fluid catalytic cracking (FCC) were investigated. The results show that the content of basic nitrogen compounds has influence on hydrocarbons cracking during CGO FCC reaction, but it is not as obvious as reported before. Furthermore, the compositional and structural identification of basic extracts by positive-ion electrospray Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) shows that basic nitrogen compounds in CGO include N, N2, NO, N2O1, and NS class species. The N1 class species centered at 9 < DBE < 13 with a carbon number ranging from 20 to 24 is the most abundant, and it is a key for CGO's retarding performance. The effect of structure and composition of basic nitrogen compounds is much more obvious than that of content, and it is stronger with the increase of their rings plus double bond equivalence (DBE). DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24027660 [article] Retardation effect of basic nitrogen compounds on hydrocarbons catalytic cracking in coker gas oil and their structural identification [texte imprimé] / Ze-kun Li, Auteur ; Gang Wang, Auteur ; Quan Shi, Auteur . - 2011 . - pp. 4123-4132. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 4123-4132 Mots-clés : Gas  oil  Catalytic  cracking Résumé : The basic nitrogen compounds in coker gas oil (CGO) narrow fractions were enriched, and their influences on hydrocarbons during fluid catalytic cracking (FCC) were investigated. The results show that the content of basic nitrogen compounds has influence on hydrocarbons cracking during CGO FCC reaction, but it is not as obvious as reported before. Furthermore, the compositional and structural identification of basic extracts by positive-ion electrospray Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) shows that basic nitrogen compounds in CGO include N, N2, NO, N2O1, and NS class species. The N1 class species centered at 9 < DBE < 13 with a carbon number ranging from 20 to 24 is the most abundant, and it is a key for CGO's retarding performance. The effect of structure and composition of basic nitrogen compounds is much more obvious than that of content, and it is stronger with the increase of their rings plus double bond equivalence (DBE). DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24027660

Synergistic process for coker gas oil and heavy cycle oil conversion for maximum light production / Gang Wang in Industrial & engineering chemistry research, Vol. 49 N° 22 (Novembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11260-11268 Titre : Synergistic process for coker gas oil and heavy cycle oil conversion for maximum light production Type de document : texte imprimé Auteurs : Gang Wang, Auteur ; Ze-kun Li, Auteur ; He Huang, Auteur Année de publication : 2011 Article en page(s) : pp. 11260-11268 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Production  Gas  oil  Synergism Résumé : Coker gas oil (CGO), heavy cycle oil (HCO), and a CGO-HCO blend were treated by solvent refinement and then cracked in a FCC pilot plant over a commercial Y zeolite-based catalyst at selected reaction conditions. The experimental setup simulates the cracking behavior of different feed streams in an FCC unit using different processing schemes. The processing alternative that can yield the highest conversion and maximum light oil production was evaluated. Blending unrefined CGO into FCC feedstock results in decreased feed conversion and retarded desirable product yields. This is attributed to the large amount of basic nitrogen compounds and polycyclic aromatics found in unrefined CGO. Solvent refinement of CGO, however, produced significant improvements in product yield, denitrification and contaminant-removal rates, and product quality. The same observations are true for feedstocks blended individually with refined HCO and a refined mixture of CGO and HCO. Refined oils are also superior to RFCC feedstocks for their improved feed conversion, product yield and product quality. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23437821 [article] Synergistic process for coker gas oil and heavy cycle oil conversion for maximum light production [texte imprimé] / Gang Wang, Auteur ; Ze-kun Li, Auteur ; He Huang, Auteur . - 2011 . - pp. 11260-11268. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11260-11268 Mots-clés : Production  Gas  oil  Synergism Résumé : Coker gas oil (CGO), heavy cycle oil (HCO), and a CGO-HCO blend were treated by solvent refinement and then cracked in a FCC pilot plant over a commercial Y zeolite-based catalyst at selected reaction conditions. The experimental setup simulates the cracking behavior of different feed streams in an FCC unit using different processing schemes. The processing alternative that can yield the highest conversion and maximum light oil production was evaluated. Blending unrefined CGO into FCC feedstock results in decreased feed conversion and retarded desirable product yields. This is attributed to the large amount of basic nitrogen compounds and polycyclic aromatics found in unrefined CGO. Solvent refinement of CGO, however, produced significant improvements in product yield, denitrification and contaminant-removal rates, and product quality. The same observations are true for feedstocks blended individually with refined HCO and a refined mixture of CGO and HCO. Refined oils are also superior to RFCC feedstocks for their improved feed conversion, product yield and product quality. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23437821