Documents disponibles écrits par cet auteur

Bromination of deactivated aromatic compounds with sodium bromide / sodium periodate under mild acidic conditions / Lalit Kumar in Industrial & engineering chemistry research, Vol. 51 N° 36 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 36 (Septembre 2012) . - pp. 11593-11597 Titre : Bromination of deactivated aromatic compounds with sodium bromide / sodium periodate under mild acidic conditions Type de document : texte imprimé Auteurs : Lalit Kumar, Auteur ; Tanu Mahajan, Auteur ; D. D. Agarwal, Auteur Année de publication : 2012 Article en page(s) : pp. 11593-11597 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Bromination Résumé : A new, simple, and practical aromatic bromination process is disclosed wherein NaBr/NaIO4 combination in acidic medium was efficiently utilized for the first time in the bromination of deactivated aromatic compounds, thus, affording the corresponding bromo-derivatives of deactivated aromatics in good yields and purity. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26350323 [article] Bromination of deactivated aromatic compounds with sodium bromide / sodium periodate under mild acidic conditions [texte imprimé] / Lalit Kumar, Auteur ; Tanu Mahajan, Auteur ; D. D. Agarwal, Auteur . - 2012 . - pp. 11593-11597. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 36 (Septembre 2012) . - pp. 11593-11597 Mots-clés : Bromination Résumé : A new, simple, and practical aromatic bromination process is disclosed wherein NaBr/NaIO4 combination in acidic medium was efficiently utilized for the first time in the bromination of deactivated aromatic compounds, thus, affording the corresponding bromo-derivatives of deactivated aromatics in good yields and purity. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26350323

Efficient and facile chlorination of industrially - important aromatic compounds using NaCl / p - TsOH/NCS in aqueous media / Tanu Mahajan 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. 3881–3886 Titre : Efficient and facile chlorination of industrially - important aromatic compounds using NaCl / p - TsOH/NCS in aqueous media Type de document : texte imprimé Auteurs : Tanu Mahajan, Auteur ; Lalit Kumar, Auteur ; K. Dwivedi, Auteur Année de publication : 2012 Article en page(s) : pp. 3881–3886 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Chlorination  industrial  Aqueous  media Résumé : A simple and efficient process for the chlorination of industrially important aromatic compounds using NaCl/p-TsOH/NCS in aqueous media under mild conditions is described. The addition of NaCl increases the yield of chlorinated product and decreases the reaction time in the presence of p-toluenesulphonic acid (p-TsOH) and N-chlorosuccinimide (NCS). The present method furnishes higher selectivities and yields of chlorinated products under mild reaction conditions in a short reaction time. Organic solvent-free conditions, a feature of green chemistry, was successively used not only for the reactions but also for the isolation of products at the end of the reaction, which seems to be the most promising methodology from the viewpoint of a green approach to organic synthesis. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201971j [article] Efficient and facile chlorination of industrially - important aromatic compounds using NaCl / p - TsOH/NCS in aqueous media [texte imprimé] / Tanu Mahajan, Auteur ; Lalit Kumar, Auteur ; K. Dwivedi, Auteur . - 2012 . - pp. 3881–3886. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 10 (Mars 2012) . - pp. 3881–3886 Mots-clés : Chlorination  industrial  Aqueous  media Résumé : A simple and efficient process for the chlorination of industrially important aromatic compounds using NaCl/p-TsOH/NCS in aqueous media under mild conditions is described. The addition of NaCl increases the yield of chlorinated product and decreases the reaction time in the presence of p-toluenesulphonic acid (p-TsOH) and N-chlorosuccinimide (NCS). The present method furnishes higher selectivities and yields of chlorinated products under mild reaction conditions in a short reaction time. Organic solvent-free conditions, a feature of green chemistry, was successively used not only for the reactions but also for the isolation of products at the end of the reaction, which seems to be the most promising methodology from the viewpoint of a green approach to organic synthesis. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201971j

Gelation and breakage behavior of model wax – oil systems / Yansong Zhao in Industrial & engineering chemistry research, Vol. 51 N° 23 (Juin 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 23 (Juin 2012) . - pp. 8123-8133 Titre : Gelation and breakage behavior of model wax – oil systems : Rheological properties and model development Type de document : texte imprimé Auteurs : Yansong Zhao, Auteur ; Lalit Kumar, Auteur ; Kristofer Paso, Auteur Année de publication : 2012 Article en page(s) : pp. 8123-8133 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Rheological  properties  Wax  Modeling  Gelation Résumé : Gelation and breakage of model wax―oil systems is investigated using microscopy, densitometry, rheometry, and XRD. Various model waxy oils are prepared, including 1 to 20 wt % (w/w) macrocrystalline wax in dodecane, 1 to 20 wt % microcrystalline wax in dodecane, and 5 wt % macrocrystalline wax in Primol 352. The influence of shear history, thermal history, and fluid composition is ascertained. A novel gel breakage model is introduced which spans the entire mechanical response of wax gels from initial Hookean behavior at low strains to equilibrium slurry flow at the infinite strain limit. The local rheology model will benefit shut-in and restart processes of waxy crude pipelines via application of standard fluid mechanics relationships. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25990325 [article] Gelation and breakage behavior of model wax – oil systems : Rheological properties and model development [texte imprimé] / Yansong Zhao, Auteur ; Lalit Kumar, Auteur ; Kristofer Paso, Auteur . - 2012 . - pp. 8123-8133. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 23 (Juin 2012) . - pp. 8123-8133 Mots-clés : Rheological  properties  Wax  Modeling  Gelation Résumé : Gelation and breakage of model wax―oil systems is investigated using microscopy, densitometry, rheometry, and XRD. Various model waxy oils are prepared, including 1 to 20 wt % (w/w) macrocrystalline wax in dodecane, 1 to 20 wt % microcrystalline wax in dodecane, and 5 wt % macrocrystalline wax in Primol 352. The influence of shear history, thermal history, and fluid composition is ascertained. A novel gel breakage model is introduced which spans the entire mechanical response of wax gels from initial Hookean behavior at low strains to equilibrium slurry flow at the infinite strain limit. The local rheology model will benefit shut-in and restart processes of waxy crude pipelines via application of standard fluid mechanics relationships. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25990325