Abstract
Hot water extraction was studied as pretreatment for
organosolv cooking in order to fractionate wood
efficiently into galactoglucomannan (GGM), lignin and
cellulosic fibre fractions. With hot water extraction at
160°C, 10.5% of wood could be extracted, which
corresponds to more than 60% of wood GGM. The purity of
precipitated GGM was about 70%, the main impurities being
xylan, galactan and lignin. The organosolv (OS) cooking
was performed in acetic acid in the presence of
phosphinic acid (the Lignofibre process, LGF). Dissolved
lignin was recovered by precipitation from the cooking
liquor with excess of water. Hot water extraction induced
some changes to the structure of lignin dissolved in
subsequent LGF cooking, probably induced by partial
cleavage of the -aryl ether bonds during the hot water
treatment. Lignin was altered in HWE treatment in such a
way that it is more resistant to extraction both during
the LGF cooking and alkaline extraction of the LGF pulp
| Original language | English |
|---|---|
| Title of host publication | 12th European Workshop on Lignocellulosics and Pulp |
| Subtitle of host publication | EWLP 2012 : August 27-30, 2012, Espoo, Finland : Proceedings |
| Place of Publication | Helsinki |
| Publisher | University of Helsinki |
| Pages | 288-291 |
| ISBN (Print) | 978-952-10-8187-3 |
| Publication status | Published - 2012 |
| MoE publication type | B3 Non-refereed article in conference proceedings |
| Event | 12th European workshop on lignocellulosics and pulp, EWLP 2012 - Espoo, Finland Duration: 27 Aug 2012 → 30 Aug 2012 Conference number: 12 |
Conference
| Conference | 12th European workshop on lignocellulosics and pulp, EWLP 2012 |
|---|---|
| Abbreviated title | EWLP 2012 |
| Country/Territory | Finland |
| City | Espoo |
| Period | 27/08/12 → 30/08/12 |
Keywords
- Hot water extraction
- organosolv cooking
- lignin
- glucomannan