Insights in mechanisms of carbonaceous microparticles formation from black liquor hydrothermal conversion
| Autor: | Elsa Weiss-Hortala, Fabienne Espitalier, Hélène Boucard, Fatou Gueye, Radu Barna |
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| Přispěvatelé: | Centre de recherche d'Albi en génie des procédés des solides divisés, de l'énergie et de l'environnement (RAPSODEE), Centre National de la Recherche Scientifique (CNRS)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Morphology (linguistics) General Chemical Engineering 0211 other engineering and technologies chemistry.chemical_element black liquor carbonaceous microparticles 02 engineering and technology Cooling rates 021001 nanoscience & nanotechnology Condensed Matter Physics hydrochar Hydrothermal circulation hydrothermal conversion [SPI]Engineering Sciences [physics] Chemical engineering chemistry secondary char formation 021108 energy Physical and Theoretical Chemistry microparticles generation 0210 nano-technology Carbon Black liquor |
| Zdroj: | Journal of Supercritical Fluids Journal of Supercritical Fluids, Elsevier, 2020, 161, pp.1-11/104817. ⟨10.1016/j.supflu.2020.104817⟩ |
| ISSN: | 0896-8446 |
| Popis: | International audience; The study addresses the formation of secondary hydrochar and the morphology of secondary microparticles from black liquor. The black liquor solution was hydrothermally converted at 350 °C and 16.5 MPa in batch reactors running from 15 min to 24 h at different heating and cooling rates. Spherical carbon microparticles were obtained at a short reaction time (< 90 min) and then coalesced to form aggregates. At a very long reaction time (24 h), spherical carbon microparticles were obtained once again. The carbonaceous solid was enriched in carbon during the first 4 hours of reaction. In parallel, the concentrations of total organic carbon and total phenols in the solution decreased drastically. The formation of solids was mainly due to chemical reactions occurring during the first 4 hours. Subsequent changes in the solids were mainly due to physical reorganization since the chemical compositions of solutions were almost stable. |
| Databáze: | OpenAIRE |
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