Effect of a Vacuum on the Fast Pyrolysis of Cellulose: Nature of Secondary Reactions in a Liquid Intermediate
| Autor: | M. Brennan Pecha, Farid Chejne, Manuel Garcia-Perez, Jorge Ivan Montoya |
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| Rok vydání: | 2017 |
| Předmět: |
Chemistry
020209 energy General Chemical Engineering Electrospray ionization Analytical chemistry 02 engineering and technology General Chemistry Mass spectrometry Evaporation (deposition) Industrial and Manufacturing Engineering Fourier transform ion cyclotron resonance Dehydration reaction 0202 electrical engineering electronic engineering information engineering Gas chromatography Char Pyrolysis |
| Zdroj: | Industrial & Engineering Chemistry Research. 56:4288-4301 |
| ISSN: | 1520-5045 0888-5885 |
| Popis: | Pyrolysis of thin films of cellulose was performed at five pressures from 4 mbar (vacuum) to 1 bar at 500 °C in a modified pyroprobe captive sample reactor designed to minimize gas-phase secondary reactions. Known molecule products were identified and quantified by gas chromatography (GC), GC/mass spectrometry (MS), and high-performance liquid chromatography, and yields were calculated. Vacuum allowed the evaporation of cellobiosan and promoted the release of heavy oligosaccharides by thermal ejection (cellotriosan, etc.), reducing in this way the residence time of the oligomeric products in the liquid intermediate and, consequently, their secondary reactions. The char yield increased from 3.6 to 8.3% in the range of pressures studied. The unknown heavy fractions in the oil were studied in more detail by high-resolution mass spectrometry using positive-ion electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry. The results illustrated a dominant dehydration reaction pathway in... |
| Databáze: | OpenAIRE |
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