Catalytic depolymerisation and conversion of Kraft lignin into liquid products using near-critical water
Artikel i vetenskaplig tidskrift, 2014
A high-pressure pilot plant was developed to study the conversion of LignoBoost Kraft lignin into bio-oil and chemicals in near-critical water (350◦C, 25 MPa). The conversion takes place in a continuous fixed-bed catalytic reactor (500 cm3) filled with ZrO2 pellets. Lignin (mass fraction of approximately 5.5%) is dispersed in an aqueous solution containing K2CO3(from 0.4% to 2.2%) and phenol (approximately 4.1%).The feed flow rate is 1 kg/h (reactor residence time 11 min) and the reaction mixture is recirculated internally at a rate of approximately 10 kg/h. The products consist of an aqueous phase, containing phenolic chemicals, and a bio-oil, showing an increased heat value (32 MJ/kg) with respect to the lignin feed. The 1-ring aromatic compounds produced in the process are mainly anisoles, alkylphenols, guaiacols and catechols: their overall yield increases from 17% to 27% (dry lignin basis) as K2CO3 is increased.
Hydrothermal conversion
Lignin
Bio-oil
Near-critical water
Catalytic conversion
LignoBoost
Författare
Huyen Lyckeskog
Chalmers, Kemi- och bioteknik, Skogsindustriell kemiteknik
Marco Maschietti
Chalmers, Kemi- och bioteknik, Skogsindustriell kemiteknik
Tallal Belkheiri
Industriella energisystem och tekniker
Lars-Erik Åmand
Industriella energisystem och tekniker
Hans Theliander
Wallenberg Wood Science Center (WWSC)
Chalmers, Kemi- och bioteknik, Skogsindustriell kemiteknik
Lennart Vamling
Industriella energisystem och tekniker
Lars Olausson
Metso power AB
Sven-Ingvar Andersson
Chalmers, Kemi- och bioteknik, Teknisk ytkemi
Journal of Supercritical Fluids
0896-8446 (ISSN)
Vol. 86 67-75Ämneskategorier
Kemiteknik
DOI
10.1016/j.supflu.2013.11.022