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Storage Stability of Bio-oils Derived from the Catalytic Conversion of Softwood Kraft Lignin in Subcritical Water

Huyen Nguyen Lyckeskog (Institutionen för kemi och kemiteknik, Skogsindustriell kemiteknik) ; Cecilia Mattsson (Institutionen för kemi och kemiteknik, Skogsindustriell kemiteknik) ; Lars-Erik Åmand (Institutionen för energi och miljö, Industriella energisystem och -tekniker ) ; Lars Olausson ; Sven-Ingvar Andersson (Institutionen för kemi och kemiteknik, Skogsindustriell kemiteknik) ; Lennart Vamling (Institutionen för kemi och kemiteknik, Skogsindustriell kemiteknik) ; Hans Theliander (Institutionen för kemi och kemiteknik, Skogsindustriell kemiteknik)
Energy & Fuels (0887-0624). Vol. 30 (2016), 4, p. 3097-3106.
[Artikel, refereegranskad vetenskaplig]

The stability of lignin-derived bio-oil obtained from a continuous process [base (K2CO3)-catalyzed, using phenol as a capping agent] under subcritical conditions of water (25 MPa, 290-370 degrees C) was investigated. The lignin-derived bio-oil obtained was stored at ambient temperature for 2 years. Our results show that the base concentration in the feed solution affects the stability of this lignin-derived bio-oil during its long-term storage. It was found that, at low base concentrations (i.e., 0.4%-1.0%), the yields of all lignin-derived bio-oil fractions were relatively stable. At high base concentrations (i.e., 1.6%-2.2%), however, the yield of high-molecular-weight (high-Mw) structures increased and that of low-molecular-weight (low-Mw) structures decreased after storage. This indicated that the low-Mw materials had been polymerized to form high-Mw materials. In addition, it was found that the yield of gas chromatography-mass spectrometry (GC-MS)-identified compounds (excluding phenol) in this lignin-derived bio-oil decreased from 15% to 11%. This is probably due to the presence of solids in these lignin derived bio-oils, which promotes the catalytic polymerization reactions, suggesting that it is beneficial to remove the solids from this lignin-derived bio-oil in order to enhance its stability. Compared to the results obtained from bio-oil derived from biomass pyrolysis, our results show that bio-oil derived from the conversion of lignin in subcritical water has better chemical stability during long-term storage.



Denna post skapades 2016-06-03. Senast ändrad 2016-11-25.
CPL Pubid: 237305

 

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