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



Near-critical water

Catalytic conversion



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 67-75





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