Documents disponibles écrits par cet auteur

Extraction of acrylic, propionic, and butyric Acid using aliquat 336 in oleyl alcohol / Amit Keshav in Industrial & engineering chemistry research, Vol. 48 N°2 (Janvier 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p.888–893 Titre : Extraction of acrylic, propionic, and butyric Acid using aliquat 336 in oleyl alcohol : equilibria and effect of temperature Type de document : texte imprimé Auteurs : Amit Keshav, Auteur ; Kailas L. Wasewar, Auteur ; Shri Chand, Auteur Année de publication : 2009 Article en page(s) : p.888–893 Note générale : chemical engineering Langues : Anglais (eng) Mots-clés : Acrylic--Propionic--Butyric  Acid Résumé : Reactive extractions of acrylic, propionic, and butyric acids using Aliquat 336 in oleyl alcohol were carried out to study the effects of temperature (305−333 K). The effects of temperature on the partition (P) and dimerization (D) coefficients were evaluated, and it was found that P decreases with increasing temperature, whereas the effects of temperature on D vary. Chemical extractions using Aliquat 336 in oleyl alcohol at temperatures ranging from 305 to 333 K show an increase in KE(1:1) values with temperature up to 313 K for acrylic and propionic acids but a decrease with increasing temperature for butyric acid over the range studied. Differences in the hydrophobicity and octanol−water partition coefficient are suggested as the reasons for the differences in extraction by the respective acids using Aliquat 336 in oleyl alcohol. The enthalpy (ΔH) and entropy (ΔS) of reaction were evaluated at different temperatures, and their difference was assessed in terms of different parameters. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8010337 [article] Extraction of acrylic, propionic, and butyric Acid using aliquat 336 in oleyl alcohol : equilibria and effect of temperature [texte imprimé] / Amit Keshav, Auteur ; Kailas L. Wasewar, Auteur ; Shri Chand, Auteur . - 2009 . - p.888–893. chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p.888–893 Mots-clés : Acrylic--Propionic--Butyric  Acid Résumé : Reactive extractions of acrylic, propionic, and butyric acids using Aliquat 336 in oleyl alcohol were carried out to study the effects of temperature (305−333 K). The effects of temperature on the partition (P) and dimerization (D) coefficients were evaluated, and it was found that P decreases with increasing temperature, whereas the effects of temperature on D vary. Chemical extractions using Aliquat 336 in oleyl alcohol at temperatures ranging from 305 to 333 K show an increase in KE(1:1) values with temperature up to 313 K for acrylic and propionic acids but a decrease with increasing temperature for butyric acid over the range studied. Differences in the hydrophobicity and octanol−water partition coefficient are suggested as the reasons for the differences in extraction by the respective acids using Aliquat 336 in oleyl alcohol. The enthalpy (ΔH) and entropy (ΔS) of reaction were evaluated at different temperatures, and their difference was assessed in terms of different parameters. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8010337

Polymer anchored catalysts for oxidation of styrene using TBHP and molecular oxygen / Sweta Sharma in Industrial & engineering chemistry research, Vol. 51 N° 26 (Juillet 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 26 (Juillet 2012) . - pp. 8806-8814 Titre : Polymer anchored catalysts for oxidation of styrene using TBHP and molecular oxygen Type de document : texte imprimé Auteurs : Sweta Sharma, Auteur ; Shishir Sinha, Auteur ; Shri Chand, Auteur Année de publication : 2012 Article en page(s) : pp. 8806-8814 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Oxidation  Catalyst Résumé : Catalytic oxidation of styrene was investigated for polymer anchored Cu(II) and Mn(II) complexes prepared by Schiff base tridentate ligand. The effect of different oxidants, tert-butyl hydroperoxide (TBHP) under atmospheric pressure and molecular oxygen (O2) at high pressure in a batch reactor, were studied for maximum conversion of styrene and selectivity of styrene oxide product. The effect of various reaction parameters such as temperature, styrene to TBHP mole ratio, and catalyst amount were studied using TBHP as oxidant. The maximum conversion of styrene (87.3%) was obtained using Cu(II) complex, with maximum selectivity to styrene oxide (76.2%) at styrene to TBHP mole ratio of 1:3, 70 °C, and 25 mg catalyst The O2 oxidant showed maximum conversion of 45.5% at 80 °C and 0.5 MPa pressure, with a styrene oxide selectivity of 22.4%. The catalytic activity was improved to 70.0% by addition of TBHP as initiator during the use of O2 oxidant. The Cu(II) catalyst showed better catalytic activity in comparison to Mn(II) catalyst using both TBHP and O2 oxidant. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26107434 [article] Polymer anchored catalysts for oxidation of styrene using TBHP and molecular oxygen [texte imprimé] / Sweta Sharma, Auteur ; Shishir Sinha, Auteur ; Shri Chand, Auteur . - 2012 . - pp. 8806-8814. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 26 (Juillet 2012) . - pp. 8806-8814 Mots-clés : Oxidation  Catalyst Résumé : Catalytic oxidation of styrene was investigated for polymer anchored Cu(II) and Mn(II) complexes prepared by Schiff base tridentate ligand. The effect of different oxidants, tert-butyl hydroperoxide (TBHP) under atmospheric pressure and molecular oxygen (O2) at high pressure in a batch reactor, were studied for maximum conversion of styrene and selectivity of styrene oxide product. The effect of various reaction parameters such as temperature, styrene to TBHP mole ratio, and catalyst amount were studied using TBHP as oxidant. The maximum conversion of styrene (87.3%) was obtained using Cu(II) complex, with maximum selectivity to styrene oxide (76.2%) at styrene to TBHP mole ratio of 1:3, 70 °C, and 25 mg catalyst The O2 oxidant showed maximum conversion of 45.5% at 80 °C and 0.5 MPa pressure, with a styrene oxide selectivity of 22.4%. The catalytic activity was improved to 70.0% by addition of TBHP as initiator during the use of O2 oxidant. The Cu(II) catalyst showed better catalytic activity in comparison to Mn(II) catalyst using both TBHP and O2 oxidant. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26107434