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

Natural nontoxic solvents for recovery of picolinic acid by reactive extraction / Mangesh D. Waghmare in Industrial & engineering chemistry research, Vol. 50 N° 23 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13526–13537 Titre : Natural nontoxic solvents for recovery of picolinic acid by reactive extraction Type de document : texte imprimé Auteurs : Mangesh D. Waghmare, Auteur ; Kailas L. Wasewar, Auteur ; Shriram S. Sonawane, Auteur Année de publication : 2012 Article en page(s) : pp. 13526–13537 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Nontoxic  solvents Résumé : Pyridine carboxylic acids and their derivatives are attracting considerable attention for their presence in many natural products. 2-Pyridinecarboxylic acid, also known as picolinic acid is widely used in the pharmaceutical industries. Compared to chemical methods, enzymatic oxidation of 3-hydroxyanthranillic acid is an advantageous alternative for the production of picolinic acid. Reactive extraction is a promising method to recover carboxylic acid but suffers from toxicity problems of the diluent and extractant employed, therefore there is a need for a nontoxic extractant and diluent or a combination of less toxic extractants in a nontoxic diluent that can recover acid efficiently. The present paper focuses on the reactive extraction of picolinic acid using tri-n-butyl phosphate (TBP) in sunflower oil and castor oil. Results were presented in terms of distribution coefficients (0.0066 to 0.664 for sunflower oil and 0.0099 to 0.94 for castor oil), loading ratio (<0.5), degree of extraction (0.65 to 42.9% for sunflower oil and 0.9 to 74.6% for castor oil), and equilibrium complexation constants. Relative basicity, mass action law, and Langmuir models were used to represent the reactive extraction equilibrium for picolinic acid–TBP–diluent. Model results are close to experimental results. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201228u [article] Natural nontoxic solvents for recovery of picolinic acid by reactive extraction [texte imprimé] / Mangesh D. Waghmare, Auteur ; Kailas L. Wasewar, Auteur ; Shriram S. Sonawane, Auteur . - 2012 . - pp. 13526–13537. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13526–13537 Mots-clés : Nontoxic  solvents Résumé : Pyridine carboxylic acids and their derivatives are attracting considerable attention for their presence in many natural products. 2-Pyridinecarboxylic acid, also known as picolinic acid is widely used in the pharmaceutical industries. Compared to chemical methods, enzymatic oxidation of 3-hydroxyanthranillic acid is an advantageous alternative for the production of picolinic acid. Reactive extraction is a promising method to recover carboxylic acid but suffers from toxicity problems of the diluent and extractant employed, therefore there is a need for a nontoxic extractant and diluent or a combination of less toxic extractants in a nontoxic diluent that can recover acid efficiently. The present paper focuses on the reactive extraction of picolinic acid using tri-n-butyl phosphate (TBP) in sunflower oil and castor oil. Results were presented in terms of distribution coefficients (0.0066 to 0.664 for sunflower oil and 0.0099 to 0.94 for castor oil), loading ratio (<0.5), degree of extraction (0.65 to 42.9% for sunflower oil and 0.9 to 74.6% for castor oil), and equilibrium complexation constants. Relative basicity, mass action law, and Langmuir models were used to represent the reactive extraction equilibrium for picolinic acid–TBP–diluent. Model results are close to experimental results. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201228u