Efficient polymerization inhibition systems for acrylic acid distillation / Jaroslav Mosnacek in Industrial & engineering chemistry research, Vol. 51 N° 10 (Mars 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 10 (Mars 2012) . - pp. 3910–3915 Titre : Efficient polymerization inhibition systems for acrylic acid distillation : New liquid - phase inhibitors Type de document : texte imprimé Auteurs : Jaroslav Mosnacek, Auteur ; Renaud Nicolay, Auteur ; Kishore K. Kar, Auteur Année de publication : 2012 Article en page(s) : pp. 3910–3915 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Polymerization Acid distillation Résumé : Phenothiazine and other compounds with similar structures, namely, phenoxazine, promazine, promazine hydrochloride, N,N′-dimethylphenazine, carbazole, N-ethylcarbazole, N-benzylphenothiazine, and N-(1-phenylethyl)phenothiazine were tested as liquid-phase inhibitors for acrylic acid. N-Alkylated phenothiazine (PTZ) derivatives, such as N-benzylphenothiazine and especially N-(1-phenylethyl)phenothiazine, showed improved efficiency for liquid-phase inhibition, in comparison with PTZ. It was also shown that N-alkylated PTZ derivatives could be used in combination with nitroso compounds that can be employed as vapor-phase inhibitors. The combination of N-(1-phenylethyl)phenothiazine and nitrosobenzene showed superior liquid-phase-inhibition efficiency, with time to gelation of >122 h, in comparison with 64 h obtained with PTZ alone. The structure of liquid-phase inhibitors had no influence on the extent of Michael addition reactions during heating of acrylic acid. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201708n [article] Efficient polymerization inhibition systems for acrylic acid distillation : New liquid - phase inhibitors [texte imprimé] / Jaroslav Mosnacek, Auteur ; Renaud Nicolay, Auteur ; Kishore K. Kar, Auteur . - 2012 . - pp. 3910–3915. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 10 (Mars 2012) . - pp. 3910–3915 Mots-clés : Polymerization Acid distillation Résumé : Phenothiazine and other compounds with similar structures, namely, phenoxazine, promazine, promazine hydrochloride, N,N′-dimethylphenazine, carbazole, N-ethylcarbazole, N-benzylphenothiazine, and N-(1-phenylethyl)phenothiazine were tested as liquid-phase inhibitors for acrylic acid. N-Alkylated phenothiazine (PTZ) derivatives, such as N-benzylphenothiazine and especially N-(1-phenylethyl)phenothiazine, showed improved efficiency for liquid-phase inhibition, in comparison with PTZ. It was also shown that N-alkylated PTZ derivatives could be used in combination with nitroso compounds that can be employed as vapor-phase inhibitors. The combination of N-(1-phenylethyl)phenothiazine and nitrosobenzene showed superior liquid-phase-inhibition efficiency, with time to gelation of >122 h, in comparison with 64 h obtained with PTZ alone. The structure of liquid-phase inhibitors had no influence on the extent of Michael addition reactions during heating of acrylic acid. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201708n

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Efficient polymerization inhibition systems for acrylic acid distillation / Renaud Nicolay in Industrial & engineering chemistry research, Vol. 51 N° 12 (Mars 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 12 (Mars 2012) . - pp. 4467–4471 Titre : Efficient polymerization inhibition systems for acrylic acid distillation : Vapor - phase inhibitors Type de document : texte imprimé Auteurs : Renaud Nicolay, Auteur ; Jaroslav Mosnacek, Auteur ; Kishore K. Kar, Auteur Année de publication : 2012 Article en page(s) : pp. 4467–4471 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Acrylic acid Polymerization Vapor phase Résumé : Nitroso compounds, such as 2-methyl-2-nitrosopropane, nitrosobenzene, and 4-nitrosophenol, were tested as volatile inhibitors for vapor-phase inhibition of acrylic acid polymerization during its reflux at 113 °C under reduced pressure. The experimental parameters were set to mimic the conditions employed for the industrial distillation of acrylic acid. Nitrosobenzene was found to be the most efficient vapor-phase inhibitor for the distillation of acrylic acid. The inhibition time was also found to be dependent on the pressure used for the experiments. Decreasing the pressure from 110 to 85 mbar resulted in an almost 2-fold increase in the inhibition time. The combination of nitrosobenzene with a liquid-phase inhibitor, namely, 4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl, significantly improved the efficiency of vapor-phase inhibition by decreasing the consumption of nitrosobenzene in the liquid phase. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201709y [article] Efficient polymerization inhibition systems for acrylic acid distillation : Vapor - phase inhibitors [texte imprimé] / Renaud Nicolay, Auteur ; Jaroslav Mosnacek, Auteur ; Kishore K. Kar, Auteur . - 2012 . - pp. 4467–4471. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 12 (Mars 2012) . - pp. 4467–4471 Mots-clés : Acrylic acid Polymerization Vapor phase Résumé : Nitroso compounds, such as 2-methyl-2-nitrosopropane, nitrosobenzene, and 4-nitrosophenol, were tested as volatile inhibitors for vapor-phase inhibition of acrylic acid polymerization during its reflux at 113 °C under reduced pressure. The experimental parameters were set to mimic the conditions employed for the industrial distillation of acrylic acid. Nitrosobenzene was found to be the most efficient vapor-phase inhibitor for the distillation of acrylic acid. The inhibition time was also found to be dependent on the pressure used for the experiments. Decreasing the pressure from 110 to 85 mbar resulted in an almost 2-fold increase in the inhibition time. The combination of nitrosobenzene with a liquid-phase inhibitor, namely, 4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl, significantly improved the efficiency of vapor-phase inhibition by decreasing the consumption of nitrosobenzene in the liquid phase. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201709y

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KT-3: a novel tickler for solids removal from slurry vessels / Richard F. Cope in Industrial & engineering chemistry research, Vol. 48 N° 10 (Mai 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 4990–4997 Titre : KT-3: a novel tickler for solids removal from slurry vessels Type de document : texte imprimé Auteurs : Richard F. Cope, Auteur ; Kishore K. Kar, Auteur Année de publication : 2009 Article en page(s) : pp. 4990–4997 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Ticklers Slurry vessels Résumé : Ticklers are relatively small impellers operating near the bottom of slurry-containing stirred-tank reactors and storage vessels. They maintain solids suspension after the level of a draining slurry recedes below the main impeller(s). Typical pitched-blade or flat-blade ticklers suspend solids, but often simultaneously starve the pump and protract drainage times by throwing material out toward the wall instead of in toward the centerline discharge nozzle. After the slurry liquid eventually drains, solids deposited on the vessel bottom and wall are often removable only by extraneous liquid sprays. By contrast, the recently designed KT-3 tickler minimizes solids heels while simultaneously avoiding pump starvation and prolonged drainage times. It does so by swirling the slurry so that it washes the unbaffled vessel bottom and sweeps solids toward the centerline exit. KT-3 ticklers have been successfully installed in vessels used in many processing industries including those for basic and fine chemicals, minerals, pharmaceuticals, and food products. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801221t [article] KT-3: a novel tickler for solids removal from slurry vessels [texte imprimé] / Richard F. Cope, Auteur ; Kishore K. Kar, Auteur . - 2009 . - pp. 4990–4997. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 4990–4997 Mots-clés : Ticklers Slurry vessels Résumé : Ticklers are relatively small impellers operating near the bottom of slurry-containing stirred-tank reactors and storage vessels. They maintain solids suspension after the level of a draining slurry recedes below the main impeller(s). Typical pitched-blade or flat-blade ticklers suspend solids, but often simultaneously starve the pump and protract drainage times by throwing material out toward the wall instead of in toward the centerline discharge nozzle. After the slurry liquid eventually drains, solids deposited on the vessel bottom and wall are often removable only by extraneous liquid sprays. By contrast, the recently designed KT-3 tickler minimizes solids heels while simultaneously avoiding pump starvation and prolonged drainage times. It does so by swirling the slurry so that it washes the unbaffled vessel bottom and sweeps solids toward the centerline exit. KT-3 ticklers have been successfully installed in vessels used in many processing industries including those for basic and fine chemicals, minerals, pharmaceuticals, and food products. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801221t

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Mixing performance of the novel kar dynamic mixer impeller in small laboratory-scale systems / Zhao Yu in Industrial & engineering chemistry research, Vol. 51 N° 46 (Novembre 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 46 (Novembre 2012) . - pp. 15282–15292 Titre : Mixing performance of the novel kar dynamic mixer impeller in small laboratory-scale systems Type de document : texte imprimé Auteurs : Zhao Yu, Auteur ; Richard F. Cope, Auteur ; Kishore K. Kar, Auteur Année de publication : 2013 Article en page(s) : pp. 15282–15292 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Laboratory scale Agitator Mixer Mixing Résumé : Small ( ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679649 [article] Mixing performance of the novel kar dynamic mixer impeller in small laboratory-scale systems [texte imprimé] / Zhao Yu, Auteur ; Richard F. Cope, Auteur ; Kishore K. Kar, Auteur . - 2013 . - pp. 15282–15292. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 46 (Novembre 2012) . - pp. 15282–15292 Mots-clés : Laboratory scale Agitator Mixer Mixing Résumé : Small ( ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679649

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