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Entrainer effect of N , N - dimethylformamide on solubility of monomers for aromatic polyimide in supercritical carbon dioxide / Masashi Haruki in Industrial & engineering chemistry research, Vol. 50 N° 21 (Novembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 21 (Novembre 2011) . - pp. 11942-11949 Titre : Entrainer effect of N , N - dimethylformamide on solubility of monomers for aromatic polyimide in supercritical carbon dioxide Type de document : texte imprimé Auteurs : Masashi Haruki, Auteur ; Naoya Fukui, Auteur ; Fumiya Kobayashi, Auteur Année de publication : 2011 Article en page(s) : pp. 11942-11949 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Supercritical  state  Carbon  dioxide  Solubility Résumé : The solubilities of 4,4'-diaminodiphenyl ether (ODA) and pyromellitic dianhydride (PMDA) in supercritical carbon dioxide (scCO2) with N,N-dimethylformamide (DMF) were measured by a semibatch flow method, to accumulate new experimental data and to clarify the entrainer effect of DMF on the solubilities of the monomers of aromatic polyimide in scCO2. All measurements were carried out at 323 K and 20.0 MPa with DMF concentrations from 0 to about 20 mol %. The solubilities of both ODA and PMDA increased dramatically with increasing DMF concentration under our experimental conditions. For example, the addition of about 10 mol % of DMF increased the solubilities of ODA and PMDA to 54- and 115-fold, respectively, as compared to their solubilities in pure scCO2. The experimental results were correlated and predicted by the Peng-Robinson equation of state (PR-EOS). The critical temperatures and pressures of ODA and PMDA were estimated utilizing the group contribution method proposed by Constantinou and Gani, and the solid molar volumes of ODA and PMDA needed for calculation were obtained by the COSMO-RS method. The vapor pressures of ODA and PMDA, which are also required to calculate the solubilities, were obtained by correlating the solubilities of ODA and PMDA in pure CO2. The binary interaction parameters were estimated by correlating the phase equilibria and solubilities for each binary system. The predicted results approximately reproduced the experimental results for the solubilities of ODA in scCO2. As for the solubilities of PMDA, while a large deviation was observed between the predicted and experimental results, the correlated results approximately corresponded to the experimental data. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24697512 [article] Entrainer effect of N , N - dimethylformamide on solubility of monomers for aromatic polyimide in supercritical carbon dioxide [texte imprimé] / Masashi Haruki, Auteur ; Naoya Fukui, Auteur ; Fumiya Kobayashi, Auteur . - 2011 . - pp. 11942-11949. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 21 (Novembre 2011) . - pp. 11942-11949 Mots-clés : Supercritical  state  Carbon  dioxide  Solubility Résumé : The solubilities of 4,4'-diaminodiphenyl ether (ODA) and pyromellitic dianhydride (PMDA) in supercritical carbon dioxide (scCO2) with N,N-dimethylformamide (DMF) were measured by a semibatch flow method, to accumulate new experimental data and to clarify the entrainer effect of DMF on the solubilities of the monomers of aromatic polyimide in scCO2. All measurements were carried out at 323 K and 20.0 MPa with DMF concentrations from 0 to about 20 mol %. The solubilities of both ODA and PMDA increased dramatically with increasing DMF concentration under our experimental conditions. For example, the addition of about 10 mol % of DMF increased the solubilities of ODA and PMDA to 54- and 115-fold, respectively, as compared to their solubilities in pure scCO2. The experimental results were correlated and predicted by the Peng-Robinson equation of state (PR-EOS). The critical temperatures and pressures of ODA and PMDA were estimated utilizing the group contribution method proposed by Constantinou and Gani, and the solid molar volumes of ODA and PMDA needed for calculation were obtained by the COSMO-RS method. The vapor pressures of ODA and PMDA, which are also required to calculate the solubilities, were obtained by correlating the solubilities of ODA and PMDA in pure CO2. The binary interaction parameters were estimated by correlating the phase equilibria and solubilities for each binary system. The predicted results approximately reproduced the experimental results for the solubilities of ODA in scCO2. As for the solubilities of PMDA, while a large deviation was observed between the predicted and experimental results, the correlated results approximately corresponded to the experimental data. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24697512