| 000 | 02270nab a2200205 4500 | ||
|---|---|---|---|
| 005 | 20260520000928.0 | ||
| 008 | 260224s2011 xxu | ||
| 245 | 0 | 0 | _aH2SO4-catalyzed pyrolysis of corncobs |
| 260 |
_a _b _cene./feb. 2011 |
||
| 270 | _a04/04/2011 ; 04/04/2011 | ||
| 300 | _a11 p. ; 359–369 | ||
| 520 | _aTranscripción del resumen del autor. The acid-catalyzed pyrolysis of corncobs is investigated for the production of chemicals (in particular furfural) and bioproducts. Particles, preimpregnated with H2SO4 concentrations up to about 4% (dry sample mass basis) and predried at 343 K, are exposed in the form of a packed-bed at a heating temperature of 800 K. The gas release rate remains approximately constant, at a value about 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 20-40 K. 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-ß-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-a-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%. | ||
| 581 | _a1 | ||
| 773 | 0 |
_tEnergy & fuels _g25 |
|
| 942 | _cARTICULO | ||
| 100 | 1 |
_aBranca, Carmen _915278 |
|
| 100 | 1 |
_aGalgano, Antonio _941685 |
|
| 100 | 1 |
_aBlasi, Carlo _945071 |
|
| 999 |
_c174414 _d174414 |
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