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Influence of p-xylene (PX) accumulation on the operation of pure terephthalic acid (PTA) solvent dehydratic distillation column / Shaojun Li in Industrial & engineering chemistry research, Vol. 48 N° 13 (Juillet 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6358–6362 Titre : Influence of p-xylene (PX) accumulation on the operation of pure terephthalic acid (PTA) solvent dehydratic distillation column Type de document : texte imprimé Auteurs : Shaojun Li, Auteur Année de publication : 2009 Article en page(s) : pp. 6358–6362 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Pure  terephthalic  acid  P-xylene  Dehydration  distillation  column Résumé : In the production of pure terephthalic acid, a tiny amount of reactant p-xylene may enter into the acetic acid dehydration distillation column through the feed stream. In normal operation, p-xylene will not leave the column from the top or bottom product. It will be accumulated in the top of dehydration distillation column and decanter. With the accumulation of p-xylene, the operation cost will be increased gradually, to ensure the purity specifications of the top and bottom products. To reduce the operation cost, it is necessary to cut down the concentration of p-xylene by draining some organic reflux and make up the pure entrainer intermittent. In this paper, reboiler duties at different concentrations of p-xylene in the reflux were analyzed. The optimal operation condition—that the concentration of p-xylene is decreased by draining some organic reflux when the mass fraction of p-xylene accumulation exceeds 0.15—had been suggested. Finally, the residue curves diagram of three key components in the top of the column was used to interpret the draining place of p-xylene. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900526n [article] Influence of p-xylene (PX) accumulation on the operation of pure terephthalic acid (PTA) solvent dehydratic distillation column [texte imprimé] / Shaojun Li, Auteur . - 2009 . - pp. 6358–6362. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6358–6362 Mots-clés : Pure  terephthalic  acid  P-xylene  Dehydration  distillation  column Résumé : In the production of pure terephthalic acid, a tiny amount of reactant p-xylene may enter into the acetic acid dehydration distillation column through the feed stream. In normal operation, p-xylene will not leave the column from the top or bottom product. It will be accumulated in the top of dehydration distillation column and decanter. With the accumulation of p-xylene, the operation cost will be increased gradually, to ensure the purity specifications of the top and bottom products. To reduce the operation cost, it is necessary to cut down the concentration of p-xylene by draining some organic reflux and make up the pure entrainer intermittent. In this paper, reboiler duties at different concentrations of p-xylene in the reflux were analyzed. The optimal operation condition—that the concentration of p-xylene is decreased by draining some organic reflux when the mass fraction of p-xylene accumulation exceeds 0.15—had been suggested. Finally, the residue curves diagram of three key components in the top of the column was used to interpret the draining place of p-xylene. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900526n

Lubricating and waxy esters II / Laziz Bouzidi in Industrial & engineering chemistry research, Vol. 51 N° 45 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 45 (Novembre 2012) . - pp. 14892-14902 Titre : Lubricating and waxy esters II : Synthesis, crystallization, and melt behavior of branched monoesters Type de document : texte imprimé Auteurs : Laziz Bouzidi, Auteur ; Shaojun Li, Auteur ; Steve Di Biase, Auteur Année de publication : 2013 Article en page(s) : pp. 14892-14902 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Crystallization Résumé : A comprehensive study of branched derivatives of four pure jojoba wax-like esters (JLEs), having 36, 40 (two isomers), and 44 carbons was conducted to elucidate their crystallization and melting behavior. Crystallization and melting characteristics depended strongly on the number of branches, molar mass, and symmetry. The derivatives demonstrated a very strong tendency to form glassy liquids rather than crystal phases and remain liquid-like at very low temperatures. As the number of branches increased, their crystallinity decreased drastically while their glassy phase increased concomitantly with the depression of the onset of crystallization and/or glass transition temperature. A variety of possible transformation paths, ranging from very little polymorphic activity to extremely polymorphic behavior, depending on number of branches, mass, and symmetry were revealed. It is shown that asymmetry plays a large role in the low temperature behavior, rendering the branched derivatives of the asymmetrical JLEs much better candidates for lubricant formulations. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26620402 [article] Lubricating and waxy esters II : Synthesis, crystallization, and melt behavior of branched monoesters [texte imprimé] / Laziz Bouzidi, Auteur ; Shaojun Li, Auteur ; Steve Di Biase, Auteur . - 2013 . - pp. 14892-14902. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 45 (Novembre 2012) . - pp. 14892-14902 Mots-clés : Crystallization Résumé : A comprehensive study of branched derivatives of four pure jojoba wax-like esters (JLEs), having 36, 40 (two isomers), and 44 carbons was conducted to elucidate their crystallization and melting behavior. Crystallization and melting characteristics depended strongly on the number of branches, molar mass, and symmetry. The derivatives demonstrated a very strong tendency to form glassy liquids rather than crystal phases and remain liquid-like at very low temperatures. As the number of branches increased, their crystallinity decreased drastically while their glassy phase increased concomitantly with the depression of the onset of crystallization and/or glass transition temperature. A variety of possible transformation paths, ranging from very little polymorphic activity to extremely polymorphic behavior, depending on number of branches, mass, and symmetry were revealed. It is shown that asymmetry plays a large role in the low temperature behavior, rendering the branched derivatives of the asymmetrical JLEs much better candidates for lubricant formulations. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26620402