Effect of pH on Kraft Lignin Depolymerisation in Subcritical Water
Artikel i vetenskaplig tidskrift, 2016

Softwood kraft lignin was depolymerized using subcritical water (623 K and 25 MPa) in a continuous small pilot unit. ZrO2 and K2CO3 were used as catalysts, and phenol was used as capping agent to suppress repolymerization. The effect of pH was investigated by adding KOH in five steps to the feed. The yield of water-soluble organics increased with pH. The yield of bio-oil was also influenced by the pH and varied between 28 and 32 wt %. The char yield on the zirconia catalyst showed a minimum at pH 8.1. The yield of suspended solids was low at pH below 8.1 but increased at higher pH values. The oxygen content in the bio-oil was only 15 wt %, compared to about 26 wt % in the kraft lignin.

catalytic depolymerization

hydrogen

ethanol

chemicals

Engineering

degradation

Energy & Fuels

pyrolysis

alkali lignin

conversion

near-critical water

supercritical water

Författare

Tallal Belkheiri

Chalmers, Energi och miljö, Industriella energisystem och -tekniker

Cecilia Mattsson

Kemi och kemiteknik, Kemiteknik, Skogsindustriell kemiteknik

Sven-Ingvar Andersson

Kemi och kemiteknik, Kemiteknik, Skogsindustriell kemiteknik

L. Olausson

Valmet Power AB

Lars-Erik Åmand

Chalmers, Energi och miljö, Industriella energisystem och -tekniker

Hans Theliander

Kemi och kemiteknik, Kemiteknik, Skogsindustriell kemiteknik

Wallenberg Wood Science Center (WWSC)

Lennart Vamling

Chalmers, Energi och miljö, Industriella energisystem och -tekniker

Energy & Fuels

0887-0624 (ISSN) 1520-5029 (eISSN)

Vol. 30 4916-4924

Ämneskategorier

Kemiteknik

DOI

10.1021/acs.energyfuels.6b00462