Journal
GREEN CHEMISTRY
Volume 20, Issue 10, Pages 2337-2344Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8gc00094h
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Funding
- Centre National de la Recherche Scientifique
- Region Pays de la Loire
- ANR (Algoroute project) [ANR-16-CE08-0017]
- IFSTTAR
- Agence Nationale de la Recherche (ANR) [ANR-16-CE08-0017] Funding Source: Agence Nationale de la Recherche (ANR)
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The hydrothermal liquefaction of Spirutina sp. microalgae (i.e. cyanobacteria) byproducts was investigated for the production of road binders from renewable sources. In the 220 300 degrees C temperature range, a water-insoluble viscous material was obtained in a ca. 50% yield, which consisted of an oily fatty acid-based fraction mixed with organic and inorganic solid residues (ca. 20%). More interestingly, this material exhibited viscoelastic properties similar to elastomer-containing bitumen, when operating the hydrothermal liquefaction between 240 and 260 degrees C. This is the first example of a bio-sourced product showing such properties. At higher temperature, fragmentation of species of high molecular weight occurred, resulting in less viscous materials that were no more thermorheologically simple. The reactor filling ratio was also allowed to vary (i.e. 30% versus 60%), showing very little influence in terms of yield and visco-elastic properties of the resulting bio-binders.
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