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

Public ISBD [article]  in Industrial & 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

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

Public ISBD [article]  in Industrial & 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