Documents disponibles écrits par cet auteur

Condensation of acetol and acetic acid vapor and nitrogen using sprayed aqueous liquid / Leland C. Dickey in Industrial & engineering chemistry research, Vol. 51 N° 13 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 13 (Avril 2012) . - pp. 5067–5072 Titre : Condensation of acetol and acetic acid vapor and nitrogen using sprayed aqueous liquid Type de document : texte imprimé Auteurs : Leland C. Dickey, Auteur ; Akwasi A. Boateng, Auteur ; Neil M. Goldberg, Auteur Année de publication : 2012 Article en page(s) : pp. 5067–5072 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Condensation  Acetol  Acetic  Acid Résumé : A cellulose-derived fraction of biomass pyrolysis vapor was simulated by evaporating acetol and acetic acid with heated nitrogen. After generating the vapor/nitrogen mixture, it was superheated in a tube oven and condensed by contact with an aqueous mist created by an ultrasonic spray nozzle. The rates of condensation and fractions of vapor condensed were determined for various fluid flow rates to estimate liquid flow rates necessary to obtain complete acetol vapor condensation. The effect of noncondensible gas on the condensation was determined by varying the ratio of nitrogen to acetol vapor. For standard conditions, no effect of nitrogen content on rate was seen for vapor contents greater than 10 mol %, which would include any practical fast pyrolysis vapor. Increasing the concentration of condensed vapor in the aqueous solution spray, up to 30 wt %, had little effect on the condensation rate. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2017465 [article] Condensation of acetol and acetic acid vapor and nitrogen using sprayed aqueous liquid [texte imprimé] / Leland C. Dickey, Auteur ; Akwasi A. Boateng, Auteur ; Neil M. Goldberg, Auteur . - 2012 . - pp. 5067–5072. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 13 (Avril 2012) . - pp. 5067–5072 Mots-clés : Condensation  Acetol  Acetic  Acid Résumé : A cellulose-derived fraction of biomass pyrolysis vapor was simulated by evaporating acetol and acetic acid with heated nitrogen. After generating the vapor/nitrogen mixture, it was superheated in a tube oven and condensed by contact with an aqueous mist created by an ultrasonic spray nozzle. The rates of condensation and fractions of vapor condensed were determined for various fluid flow rates to estimate liquid flow rates necessary to obtain complete acetol vapor condensation. The effect of noncondensible gas on the condensation was determined by varying the ratio of nitrogen to acetol vapor. For standard conditions, no effect of nitrogen content on rate was seen for vapor contents greater than 10 mol %, which would include any practical fast pyrolysis vapor. Increasing the concentration of condensed vapor in the aqueous solution spray, up to 30 wt %, had little effect on the condensation rate. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2017465

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.

Pyrolysis of broiler manure / Isabel M. Lima in Industrial & engineering chemistry research, Vol. 48 N°3 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1292–1297 Titre : Pyrolysis of broiler manure : char and product gas characterization Type de document : texte imprimé Auteurs : Isabel M. Lima, Auteur ; Akwasi A. Boateng, Auteur ; K. Thomas Klasson, Auteur Année de publication : 2009 Article en page(s) : p. 1292–1297 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Manure  --  Pyrolysis Résumé : Value-added materials produced from broiler manure can be a renewable alternative to its problematic disposal. Pyrolysis of broiler manure (litter and cake) produces char, bio-oil, and biogas. In this study broiler manure chars were characterized for their ability to adsorb selected metal ions. Char yields for pelletized broiler manure slowly pyrolyzed at 700 and 800 °C for 1 h ranged between 29.6% and 33.5%. Surface areas for the broiler litter and cake decreased with pyrolysis temperature with 238 and 318 m2/g and 199 and 261 m2/g for 700 and 800 °C, respectively. Broiler manure chars removed significantly more metal ions from solution (up to 0.91 mmol/g Cu2+ and 0.96 mmol/g Zn2+) when compared to chars produced from coal, wood, or coconut shells (up to 0.0 mmol/g Cu2+ and 0.10 mmol/g Zn2+). Composition of the biogas generated during fast pyrolysis between 700−900 °C, as a measurement of its energy potential, was also determined. The major components of the noncondensable gas produced during fast pyrolysis of broiler manure, included CO, CO2, low molecular weight hydrocarbon gases, and H2. Except for CO, noncondensable gases increased with pyrolysis temperature. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800989s [article] Pyrolysis of broiler manure : char and product gas characterization [texte imprimé] / Isabel M. Lima, Auteur ; Akwasi A. Boateng, Auteur ; K. Thomas Klasson, Auteur . - 2009 . - p. 1292–1297. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1292–1297 Mots-clés : Manure  --  Pyrolysis Résumé : Value-added materials produced from broiler manure can be a renewable alternative to its problematic disposal. Pyrolysis of broiler manure (litter and cake) produces char, bio-oil, and biogas. In this study broiler manure chars were characterized for their ability to adsorb selected metal ions. Char yields for pelletized broiler manure slowly pyrolyzed at 700 and 800 °C for 1 h ranged between 29.6% and 33.5%. Surface areas for the broiler litter and cake decreased with pyrolysis temperature with 238 and 318 m2/g and 199 and 261 m2/g for 700 and 800 °C, respectively. Broiler manure chars removed significantly more metal ions from solution (up to 0.91 mmol/g Cu2+ and 0.96 mmol/g Zn2+) when compared to chars produced from coal, wood, or coconut shells (up to 0.0 mmol/g Cu2+ and 0.10 mmol/g Zn2+). Composition of the biogas generated during fast pyrolysis between 700−900 °C, as a measurement of its energy potential, was also determined. The major components of the noncondensable gas produced during fast pyrolysis of broiler manure, included CO, CO2, low molecular weight hydrocarbon gases, and H2. Except for CO, noncondensable gases increased with pyrolysis temperature. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800989s