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Effect of reactive distillation on the yield of tetraacetylethylenediamine (TAED) / Eun-Seon Kim in Industrial & engineering chemistry research, Vol. 49 N° 22 (Novembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11250–11253 Titre : Effect of reactive distillation on the yield of tetraacetylethylenediamine (TAED) Type de document : texte imprimé Auteurs : Eun-Seon Kim, Auteur ; Kyun Young Park, Auteur ; Jung-Moo Heo, Auteur Année de publication : 2011 Article en page(s) : pp. 11250–11253 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Tetraacetylethylenediamine Résumé : Tetraacetylethylenediamine (TAED) was prepared by acetylation of diacetylethylenediamine (DAED) with acetic anhydride in a 5 L reactor coupled with a packed distillation column, 2.5 cm in inside diameter and 1 m in length. The reaction temperature was set at 135 °C and the reflux ratio at 6. The molar ratio of acetic anhydride to DAED was varied from 3 to 5. A TAED yield as high as 80% was obtained, higher by 15% than in the absence of distillation. The temporal variation of the TAED yield was calculated using the kinetic parameters in the literature. Calculated and experimental values showed good agreement. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100886n [article] Effect of reactive distillation on the yield of tetraacetylethylenediamine (TAED) [texte imprimé] / Eun-Seon Kim, Auteur ; Kyun Young Park, Auteur ; Jung-Moo Heo, Auteur . - 2011 . - pp. 11250–11253. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11250–11253 Mots-clés : Tetraacetylethylenediamine Résumé : Tetraacetylethylenediamine (TAED) was prepared by acetylation of diacetylethylenediamine (DAED) with acetic anhydride in a 5 L reactor coupled with a packed distillation column, 2.5 cm in inside diameter and 1 m in length. The reaction temperature was set at 135 °C and the reflux ratio at 6. The molar ratio of acetic anhydride to DAED was varied from 3 to 5. A TAED yield as high as 80% was obtained, higher by 15% than in the absence of distillation. The temporal variation of the TAED yield was calculated using the kinetic parameters in the literature. Calculated and experimental values showed good agreement. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100886n

Thermal decomposition of waste linear alkylbenzene sulfonate / Hyung Ju Lee in Industrial & engineering chemistry research, Vol. 47 n°21 (Novembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8412–8415 Titre : Thermal decomposition of waste linear alkylbenzene sulfonate Type de document : texte imprimé Auteurs : Hyung Ju Lee, Auteur ; Kyun Young Park, Auteur ; Monn surk-silk, Auteur Année de publication : 2008 Article en page(s) : p. 8412–8415 Note générale : chemical engineering Langues : Anglais (eng) Mots-clés : thermal  decompositionlinear  alkylbenzene Résumé : A thermal decomposition is proposed to convert a waste linear alkylbenzene sulfonate (LAS) into a solid material that is environmentally more favorable and disposable at a lower cost. The waste LAS is a viscous liquid containing sulfur as high as 13.3 wt %. The waste LAS was heated in a nitrogen atmosphere at 200−300 °C for 1−4 h. The thermal treatment at 250 °C for 2 h decomposed the waste into vapors and a solid material or residue, 2.0 wt % in sulfur content. The vapors were cooled with water to form two condensate layers in the receiving cylinder. The upper layer was identified to be a linear alkylbenzene (LAB) and the lower one a mixture of water and organic sulfur oxy compounds. The uncondensed vapor that left the condenser was determined to be a mixture of SO2, SO3, and H2SO4. A material balance shows that the mass of the waste LAS charged was distributed in the decomposition products as follows: the solid residue, 65.3%; the LAB, 5.6%; the mixture of water and organic sulfur compounds, 5.6%; the mixture of SO2, SO3, and H2SO4, 21.5%; unidentifiable loss, 2.0%. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800382n [article] Thermal decomposition of waste linear alkylbenzene sulfonate [texte imprimé] / Hyung Ju Lee, Auteur ; Kyun Young Park, Auteur ; Monn surk-silk, Auteur . - 2008 . - p. 8412–8415. chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8412–8415 Mots-clés : thermal  decompositionlinear  alkylbenzene Résumé : A thermal decomposition is proposed to convert a waste linear alkylbenzene sulfonate (LAS) into a solid material that is environmentally more favorable and disposable at a lower cost. The waste LAS is a viscous liquid containing sulfur as high as 13.3 wt %. The waste LAS was heated in a nitrogen atmosphere at 200−300 °C for 1−4 h. The thermal treatment at 250 °C for 2 h decomposed the waste into vapors and a solid material or residue, 2.0 wt % in sulfur content. The vapors were cooled with water to form two condensate layers in the receiving cylinder. The upper layer was identified to be a linear alkylbenzene (LAB) and the lower one a mixture of water and organic sulfur oxy compounds. The uncondensed vapor that left the condenser was determined to be a mixture of SO2, SO3, and H2SO4. A material balance shows that the mass of the waste LAS charged was distributed in the decomposition products as follows: the solid residue, 65.3%; the LAB, 5.6%; the mixture of water and organic sulfur compounds, 5.6%; the mixture of SO2, SO3, and H2SO4, 21.5%; unidentifiable loss, 2.0%. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800382n