Documents disponibles écrits par cet auteur

Hydrogenation of a-methylstyrene in a piston-oscillating monolith reactor / Alan G. Bussard in Industrial & engineering chemistry research, Vol. 47 n°14 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4623-4631 Titre : Hydrogenation of a-methylstyrene in a piston-oscillating monolith reactor Type de document : texte imprimé Auteurs : Alan G. Bussard, Auteur ; Yogesh G. Waghmare, Auteur ; Kerry M Dooley, Auteur ; F Carl Knopf, Auteur Année de publication : 2008 Article en page(s) : p. 4623-4631 Note générale : Bibliogr. p. 4631 Langues : Anglais (eng) Mots-clés : A-methylstyrene  --  hydrogenation;  Piston-oscillating  monolith  reactor; Résumé : The hydrogenation of a-methylstyrene (AMS) to cumene was investigated in a novel piston-oscillating monolith reactor (POMR). Low-frequency (0-17.5 Hz) and -amplitude (2.5 mm) mechanical oscillations were applied to the three-phase system at 46 °C and 0.44 MPa of H2. For comparison purposes, the reaction was also carried out in a stirred tank at identical temperatures and pressures and at similar power input per volume. Results show activity improvements of up to 84% for 17.5 Hz, 2.5 mm piston oscillations over low-frequency gas flow pulsing conditions, and significantly greater improvements when compared to trickle beds or conventional monolith reactors. The POMR also gives as good or better selectivity toward cumene than a stirred tank at identical conditions. While the effects of catalyst pretreatment and its impact on the Pd crystallite size also have an important role in determining the catalyst activity and long-term stability in AMS hydrogenation, these results suggest that the impact of low-frequency and -amplitude oscillations, applied to structured reactors, is considerable. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701708w [article] Hydrogenation of a-methylstyrene in a piston-oscillating monolith reactor [texte imprimé] / Alan G. Bussard, Auteur ; Yogesh G. Waghmare, Auteur ; Kerry M Dooley, Auteur ; F Carl Knopf, Auteur . - 2008 . - p. 4623-4631. Bibliogr. p. 4631 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4623-4631 Mots-clés : A-methylstyrene  --  hydrogenation;  Piston-oscillating  monolith  reactor; Résumé : The hydrogenation of a-methylstyrene (AMS) to cumene was investigated in a novel piston-oscillating monolith reactor (POMR). Low-frequency (0-17.5 Hz) and -amplitude (2.5 mm) mechanical oscillations were applied to the three-phase system at 46 °C and 0.44 MPa of H2. For comparison purposes, the reaction was also carried out in a stirred tank at identical temperatures and pressures and at similar power input per volume. Results show activity improvements of up to 84% for 17.5 Hz, 2.5 mm piston oscillations over low-frequency gas flow pulsing conditions, and significantly greater improvements when compared to trickle beds or conventional monolith reactors. The POMR also gives as good or better selectivity toward cumene than a stirred tank at identical conditions. While the effects of catalyst pretreatment and its impact on the Pd crystallite size also have an important role in determining the catalyst activity and long-term stability in AMS hydrogenation, these results suggest that the impact of low-frequency and -amplitude oscillations, applied to structured reactors, is considerable. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701708w

Partial hydrogenation of soybean oil in a piston oscillating monolith reactor / Yogesh G. Waghmare in Industrial & engineering chemistry research, Vol. 49 N° 14 (Juillet 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6323–6331 Titre : Partial hydrogenation of soybean oil in a piston oscillating monolith reactor Type de document : texte imprimé Auteurs : Yogesh G. Waghmare, Auteur ; Alan G. Bussard, Auteur ; Robert V. Forest, Auteur Année de publication : 2010 Article en page(s) : pp. 6323–6331 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Hydrogenation  Soybean  Oil Résumé : The partial hydrogenation of soybean oil was carried out in a novel piston oscillating monolith reactor (POMR). POMR performance was studied under the application of low frequency (0−17.5 Hz) and amplitude (2.5 mm) vibrations at 110 °C and 0.41 MPa H2 using a Pd/Al2O3 monolith catalyst. Results show observed rate improvements of up to 220% for 17.5 Hz, 2.5 mm piston oscillations over low frequency pulsing conditions. For comparison purposes, the reaction was also carried out in a stirred tank reactor using the monolith catalyst. The POMR showed better activity at an equivalent power per unit volume when compared to a stirred tank. With the monolith catalyst, both external and internal mass transfer limitations exist. Using standard diffusion-reaction calculations and measurements over a range of particle sizes it was shown that the vibrations improve external mass transfer rates as well as internal transport within the washcoat. The POMR showed equal or better serial pathway selectivity than a stirred tank, except at the highest frequency, but gave higher trans fatty acid formation. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie902000e [article] Partial hydrogenation of soybean oil in a piston oscillating monolith reactor [texte imprimé] / Yogesh G. Waghmare, Auteur ; Alan G. Bussard, Auteur ; Robert V. Forest, Auteur . - 2010 . - pp. 6323–6331. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6323–6331 Mots-clés : Hydrogenation  Soybean  Oil Résumé : The partial hydrogenation of soybean oil was carried out in a novel piston oscillating monolith reactor (POMR). POMR performance was studied under the application of low frequency (0−17.5 Hz) and amplitude (2.5 mm) vibrations at 110 °C and 0.41 MPa H2 using a Pd/Al2O3 monolith catalyst. Results show observed rate improvements of up to 220% for 17.5 Hz, 2.5 mm piston oscillations over low frequency pulsing conditions. For comparison purposes, the reaction was also carried out in a stirred tank reactor using the monolith catalyst. The POMR showed better activity at an equivalent power per unit volume when compared to a stirred tank. With the monolith catalyst, both external and internal mass transfer limitations exist. Using standard diffusion-reaction calculations and measurements over a range of particle sizes it was shown that the vibrations improve external mass transfer rates as well as internal transport within the washcoat. The POMR showed equal or better serial pathway selectivity than a stirred tank, except at the highest frequency, but gave higher trans fatty acid formation. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie902000e