Abstract
In order to study how the physical form and size of wood
raw material affect the xylan dissolution in hot water
extraction (HWE), three different birch materials were
used. Industrial chips, compressed chips and sawdust were
extracted in a 30 L apparatus in batch mode at 160°C up
to 5 h. The total extraction dissolved about 30% of all
starting materials, slightly more from the sawdust than
from the chips. Higher proportion of the native xylan
could be extracted from the sawdust (77%) than from the
chips (67%). Higher amounts of polymeric material,
consisting mainly of xylan, can be produced from birch
sawdust than from birch chips. For sawdust, the
extraction time of 30 min or less is enough for
production of high-molar-mass xylan, whereas extraction
time of 1 h is required for the chips. Compression of the
chips is beneficial for the release of higher amounts of
high-molar-mass material with Mw about 10 kDa. (10 refs.)
| Original language | English |
|---|---|
| Title of host publication | Proceedings |
| Subtitle of host publication | 16th International Symposium on Wood, Fiber and Pulping Chemistry, 16th ISWFPC |
| Pages | 1013-1018 |
| Volume | 2 |
| Publication status | Published - 2011 |
| MoE publication type | A4 Article in a conference publication |
| Event | 16th International Symposium on Wood, Fiber and Pulping Chemistry, 16th ISWFPC - Tianjin, China Duration: 8 Jun 2011 → 10 Jun 2011 |
Conference
| Conference | 16th International Symposium on Wood, Fiber and Pulping Chemistry, 16th ISWFPC |
|---|---|
| Abbreviated title | 16th ISWFPC |
| Country | China |
| City | Tianjin |
| Period | 8/06/11 → 10/06/11 |
Keywords
- Betula verrucosa
- birch sawdust
- birch wood
- cellulose
- hot water extraction
- lignin
- molar mass
- pressurized extraction
- xylan
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Cite this
Kleen, M., Liitiä, T., & Tehomaa, M. (2011). The effect of the physical form and size of raw materials in pressurized hot water extraction of birch. In Proceedings: 16th International Symposium on Wood, Fiber and Pulping Chemistry, 16th ISWFPC (Vol. 2, pp. 1013-1018)