H2SO4-CATALYZED PYROLYSIS OF CORNCOBS (Abstract/Poster in convegno)

Type
Label
  • H2SO4-CATALYZED PYROLYSIS OF CORNCOBS (Abstract/Poster in convegno) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Alternative label
  • C. Branca, A. Galgano , C. Blasi , M. Esposito , C. Di Blasi (2011)
    H2SO4-CATALYZED PYROLYSIS OF CORNCOBS
    in XXXIV Meeting of the Italian Section of the Combustion Institute, Roma (IT), 24-26 ottobre 2011
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • C. Branca, A. Galgano , C. Blasi , M. Esposito , C. Di Blasi (literal)
Note
  • Abstract (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Istituto di Ricerche sulla Combustione, C.N.R., P.le V. Tecchio, 80125 Napoli, Italy Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale Universit√† degli Studi di Napoli \"Federico II\", P.le V. Tecchio, 80125 Napoli, Italy (literal)
Titolo
  • H2SO4-CATALYZED PYROLYSIS OF CORNCOBS (literal)
Abstract
  • The acid catalyzed pyrolysis of corncobs is investigated for the production of chemicals (in particular furfural) and bioproducts. Particles, pre-impregnated with H2SO4 concentrations up to about 4% (dry sample mass basis) and pre-dried at 343K, are exposed in the form of a packed-bed at a heating temperature of 800K. The gas release rate remains approximately constant, at a value about the half with respect to the maximum detected for acid-free samples, for a large part of the process transients. Conversion times are roughly increased by 50% while reaction temperatures, on the average, become lower by about 20-40K. Dehydrating and charring reactions become successively more favored suppressing the formation of condensable organic compounds. A decay is observed in the yields of both some carbohydrates (hydroxyacetaldehyde, hydroxypropanone, furfuryl alcohol, etc.) and phenolics (phenol, guiacol, 4-methyguaicol, 4-ethylguaicol, syringol) although less steep for the latter. However, catalyst concentrations below 0.5% lead to maxima in the yields of levoglucosan, 5-hydroxymethylfurfural and 1,6-anhydro-?-D-glucofuranose. Moreover, the production is significantly enhanced of levoglucosenone (from trace amounts up to 4.5%) and furfural (from 0.65% up to 5%) at catalyst concentrations around 1-2% and 2-3%, with 1,4:3,6-dianhydro-?-D-glucopyranose (maximum yield 0.65%) acting as a reaction intermediate. The yield of acetic acid remains constant at 4% up to catalyst concentration around 3%. Higher catalyst concentrations are associated with a rapid decline in the yields of all these organic compounds with the total amount of char, carbon dioxide and water reaching 70%. (literal)
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