Comparison between ethanol and diethyl carbonate as ethylating agents for ethyl octyl ether synthesis over acidic ion-exchange resins / Jordi Guilera in Industrial & engineering chemistry research, Vol. 51 N° 50 (Décembre 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) . - pp. 16525-16530 Titre : Comparison between ethanol and diethyl carbonate as ethylating agents for ethyl octyl ether synthesis over acidic ion-exchange resins Type de document : texte imprimé Auteurs : Jordi Guilera, Auteur ; Roger Bringue, Auteur ; Eliana Ramirez, Auteur Année de publication : 2013 Article en page(s) : pp. 16525-16530 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Ion exchange resin Résumé : Direct addition of bioethanol to diesel reduces the quality of commercial blends. An alternative way to introduce bioethanol into diesel is as linear ether such as ethyl octyl ether (EOE). EOE synthesis by I-octanol (OcOH) reaction with ethanol (EtOH) or diethyl carbonate (DEC) over acidic ion-exchange resins has been studied in a 100-mL batch reactor (130― 150 °C, 25 bar). The main drawback for ethylating OcOH in both reaction systems is the loss of ethyl groups by diethyl ether formation. In OcOH excess, selectivity to EOE with respect to EtOH and to DEC was found to be similar (58―59%) when the ethylating agent was entirely consumed. However, the initial reaction rate of EOE formation from DEC is lower, due to the formation of ethyl octyl carbonate as reaction intermediate. Accordingly, EtOH showed to be more interesting ethylating agent to produce a synthetic biofuel such as EOE over acidic ion-exchange resins. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26732181 [article] Comparison between ethanol and diethyl carbonate as ethylating agents for ethyl octyl ether synthesis over acidic ion-exchange resins [texte imprimé] / Jordi Guilera, Auteur ; Roger Bringue, Auteur ; Eliana Ramirez, Auteur . - 2013 . - pp. 16525-16530. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) . - pp. 16525-16530 Mots-clés : Ion exchange resin Résumé : Direct addition of bioethanol to diesel reduces the quality of commercial blends. An alternative way to introduce bioethanol into diesel is as linear ether such as ethyl octyl ether (EOE). EOE synthesis by I-octanol (OcOH) reaction with ethanol (EtOH) or diethyl carbonate (DEC) over acidic ion-exchange resins has been studied in a 100-mL batch reactor (130― 150 °C, 25 bar). The main drawback for ethylating OcOH in both reaction systems is the loss of ethyl groups by diethyl ether formation. In OcOH excess, selectivity to EOE with respect to EtOH and to DEC was found to be similar (58―59%) when the ethylating agent was entirely consumed. However, the initial reaction rate of EOE formation from DEC is lower, due to the formation of ethyl octyl carbonate as reaction intermediate. Accordingly, EtOH showed to be more interesting ethylating agent to produce a synthetic biofuel such as EOE over acidic ion-exchange resins. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26732181

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Kinetics of 1-pentanol etherification without water removal / Roger Bringue in Industrial & engineering chemistry research, Vol. 50 N° 13 (Juillet 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 7911–7919 Titre : Kinetics of 1-pentanol etherification without water removal Type de document : texte imprimé Auteurs : Roger Bringue, Auteur ; Eliana Ramirez, Auteur ; Carles Fite, Auteur Année de publication : 2011 Article en page(s) : pp. 7911–7919 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Kinetics Résumé : The effect of water on the kinetics of the liquid-phase dehydration of 1-pentanol to di-n-pentyl ether (DNPE) and water over Amberlyst 70 is revisited. To explain the strong inhibitor effect of water, two approaches were compared. First, a model stemming from a Langmuir–Hinshelwood–Hougen–Watson (LHHW) mechanism was used, wherein the inhibitor effect of water was explained by the competitive adsorption of water and pentanol. Second, a modified Eley–Rideal (ER) model was used that includes an inhibition factor, in which a Freundlich-like function is used to explain the inhibitor effect of water by blocking the access of pentanol to the active centers. Both models fitted data quite well, although the best results were obtained with the modified ER model. The activation energy was 118.7 ± 0.2 kJ/mol for the LHHW model and 114.0 ± 0.1 kJ/mol for the modified ER one. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1025776 [article] Kinetics of 1-pentanol etherification without water removal [texte imprimé] / Roger Bringue, Auteur ; Eliana Ramirez, Auteur ; Carles Fite, Auteur . - 2011 . - pp. 7911–7919. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 7911–7919 Mots-clés : Kinetics Résumé : The effect of water on the kinetics of the liquid-phase dehydration of 1-pentanol to di-n-pentyl ether (DNPE) and water over Amberlyst 70 is revisited. To explain the strong inhibitor effect of water, two approaches were compared. First, a model stemming from a Langmuir–Hinshelwood–Hougen–Watson (LHHW) mechanism was used, wherein the inhibitor effect of water was explained by the competitive adsorption of water and pentanol. Second, a modified Eley–Rideal (ER) model was used that includes an inhibition factor, in which a Freundlich-like function is used to explain the inhibitor effect of water by blocking the access of pentanol to the active centers. Both models fitted data quite well, although the best results were obtained with the modified ER model. The activation energy was 118.7 ± 0.2 kJ/mol for the LHHW model and 114.0 ± 0.1 kJ/mol for the modified ER one. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1025776

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