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Packed - bed catalytic cracking of oak - derived pyrolytic vapors / David J. Mihalcik 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. 13304–13312 Titre : Packed - bed catalytic cracking of oak - derived pyrolytic vapors Type de document : texte imprimé Auteurs : David J. Mihalcik, Auteur ; Akwasi A. Boateng, Auteur ; Charles A. Mullen, Auteur Année de publication : 2012 Article en page(s) : pp. 13304–13312 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalytic  Pyrolysis  vapors Résumé : Catalytic upgrading of pyrolysis vapors derived from oak was carried out using a fixed-bed catalytic column at 425 °C. The vapors were drawn by splitting a fraction from the full stream of vapors produced at 500 °C in a 5 kg/h bench-scale fast pyrolysis reactor system downstream from the cyclone separator. The placement of the fixed-bed column was varied within the condenser train to determine the effect of temperature, residual water, solids, and oxygenated components of the approach vapor stream on the upgraded product quality. The upgraded liquid was collected by immediate contact with a dry ice acetone bath, complimented by a secondary collection system comprised of a methanol spray condenser. Quantitative gas chromatography/mass spectroscopy (GC/MS) analysis of the recovered liquid showed a substantial decrease of oxygen-containing species with a significant increase in carbon-rich (≥C6) aromatic hydrocarbons. The extent of deoxygenation was location-specific and dependent upon temperature and the relative concentrations of water, oxygenates, and residual solids in the approach vapor. The study provides the engineering practicality to catalytic vapor upgrading and offers the necessary data for the design and optimization of a full-stream upgrading of pyrolysis oils via in situ vapor cracking. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201831e [article] Packed - bed catalytic cracking of oak - derived pyrolytic vapors [texte imprimé] / David J. Mihalcik, Auteur ; Akwasi A. Boateng, Auteur ; Charles A. Mullen, Auteur . - 2012 . - pp. 13304–13312. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13304–13312 Mots-clés : Catalytic  Pyrolysis  vapors Résumé : Catalytic upgrading of pyrolysis vapors derived from oak was carried out using a fixed-bed catalytic column at 425 °C. The vapors were drawn by splitting a fraction from the full stream of vapors produced at 500 °C in a 5 kg/h bench-scale fast pyrolysis reactor system downstream from the cyclone separator. The placement of the fixed-bed column was varied within the condenser train to determine the effect of temperature, residual water, solids, and oxygenated components of the approach vapor stream on the upgraded product quality. The upgraded liquid was collected by immediate contact with a dry ice acetone bath, complimented by a secondary collection system comprised of a methanol spray condenser. Quantitative gas chromatography/mass spectroscopy (GC/MS) analysis of the recovered liquid showed a substantial decrease of oxygen-containing species with a significant increase in carbon-rich (≥C6) aromatic hydrocarbons. The extent of deoxygenation was location-specific and dependent upon temperature and the relative concentrations of water, oxygenates, and residual solids in the approach vapor. The study provides the engineering practicality to catalytic vapor upgrading and offers the necessary data for the design and optimization of a full-stream upgrading of pyrolysis oils via in situ vapor cracking. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201831e

Production of bio-oil from alfalfa stems by fluidized-bed fast pyrolysis / Akwasi A. Boateng in Industrial & engineering chemistry research, Vol. 47 n°12 (Juin 2008)

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°12 (Juin 2008) . - p. 4115–4122 Titre : Production of bio-oil from alfalfa stems by fluidized-bed fast pyrolysis Type de document : texte imprimé Auteurs : Akwasi A. Boateng, Auteur ; Charles A. Mullen, Auteur ; Neil Goldberg, Auteur ; Kevin B. Hicks, Auteur Année de publication : 2008 Article en page(s) : p. 4115–4122 Note générale : Bibliogr. p. 4122 Langues : Anglais (eng) Mots-clés : Alfalfa  stem  material;  Bio-oil;  Pyrolysis Résumé : This study focused on the production of bio-oil from alfalfa stem material. Two alfalfa maturity stages, harvested at the early bud and full flower stages of development, were examined to evaluate the impact of variation in cell wall polysaccharide and lignin content on pyrolysis oil yields, production efficiency, and bio-oil and char quality, in terms of their use as combustion fuel and for chemicals. Findings included a lower-than-average yield of bio-oil and a higher-than-average yield of charcoal from alfalfa stems, compared to previous results for other biomass feedstocks. The bio-oil showed a decrease in oxygen content from the alfalfa stems, leading to a higher-than-average energy content in the bio-oil. Bio-oil yields were slightly higher for the more-mature alfalfa, which had higher levels of cell wall cellulose and lignin. Overall, when all the pyrolysis products were considered, energy recovery was better for the more-mature alfalfa stems. [article] Production of bio-oil from alfalfa stems by fluidized-bed fast pyrolysis [texte imprimé] / Akwasi A. Boateng, Auteur ; Charles A. Mullen, Auteur ; Neil Goldberg, Auteur ; Kevin B. Hicks, Auteur . - 2008 . - p. 4115–4122. Bibliogr. p. 4122 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°12 (Juin 2008) . - p. 4115–4122 Mots-clés : Alfalfa  stem  material;  Bio-oil;  Pyrolysis Résumé : This study focused on the production of bio-oil from alfalfa stem material. Two alfalfa maturity stages, harvested at the early bud and full flower stages of development, were examined to evaluate the impact of variation in cell wall polysaccharide and lignin content on pyrolysis oil yields, production efficiency, and bio-oil and char quality, in terms of their use as combustion fuel and for chemicals. Findings included a lower-than-average yield of bio-oil and a higher-than-average yield of charcoal from alfalfa stems, compared to previous results for other biomass feedstocks. The bio-oil showed a decrease in oxygen content from the alfalfa stems, leading to a higher-than-average energy content in the bio-oil. Bio-oil yields were slightly higher for the more-mature alfalfa, which had higher levels of cell wall cellulose and lignin. Overall, when all the pyrolysis products were considered, energy recovery was better for the more-mature alfalfa stems.