The effect of temperature on the catalytic conversion of Kraft lignin using near-critical water
Artikel i vetenskaplig tidskrift, 2014

The catalytic conversion of suspended LignoBoost Kraft lignin was performed in near-critical water using ZrO2/K2CO3 as the catalytic system and phenol as the co-solvent and char suppressing agent. The reaction temperature was varied from 290 to 370 degrees C and its effect on the process was investigated in a continuous flow (1 kg/h). The yields of water-soluble organics (WSO), bio-oil and char (dry lignin basis) were in the ranges of 5-11%, 69-87% and 16-22%, respectively. The bio-oil, being partially deoxygenated, exhibited higher carbon content and heat value, but lower sulphur content than lignin. The main 1-ring aromatics (in WSO and diethylether-soluble bio-oil) were anisoles, alkylphenols, catechols and guaiacols. The results show that increasing temperature increases the yield of 1-ring aromatics remarkably, while it increases the formation of char moderately. An increase in the yields of anisoles, alkylphenols and catechols, together with a decrease in the yield of guaiacols, was also observed.


Near-critical water

Catalytic conversion




Huyen Lyckeskog

Chalmers, Kemi- och bioteknik, Skogsindustriell kemiteknik

Marco Maschietti

Chalmers, Kemi- och bioteknik, Skogsindustriell kemiteknik

Lars-Erik Åmand

Industriella energisystem och tekniker

Lennart Vamling

Industriella energisystem och tekniker

L. Olausson


Sven-Ingvar Andersson

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Hans Theliander

Chalmers, Kemi- och bioteknik, Skogsindustriell kemiteknik

Wallenberg Wood Science Center (WWSC)

Bioresource Technology

0960-8524 (ISSN) 1873-2976 (eISSN)

Vol. 170 196-203


Industriell bioteknik



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