Abstract
The AlkOx process, composed of a first water prehydrolysis stage and a second alkaline oxidation stage, is an efficient fractionation method for various types of lignocellulosic biomass. The 1st stage induces mainly hemicellulose separation.Sodium carbonate (Na2CO3) and oxygen (O2) are applied in the 2nd stage, which dissolves the main part of lignin in oxidised form and a cellulosic fibre fraction is obtained. The aim of the present study was to clarify the role of oxygen in the 2nd stage, using birch wood as raw material. Two O2 charges and O2 absence were tested, also two mixing speeds. O absence resulted in negligible delignification, whereas O2 charges of 5-10 bar caused dramatic decrease of the kappa number to 4-8 of the obtained pulp. The filtrates were analysed for dissolved lignin and degradation products. The consumption of oxygen in each case was determined.
| Original language | English |
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| Number of pages | 4 |
| Publication status | Published - 28 Jun 2022 |
| MoE publication type | Not Eligible |
| Event | 16th European workshop on lignocellulosics and pulp, EWLP 2022 - Gothenburg, Sweden, Gothenburg, Sweden Duration: 28 Jun 2022 → 1 Jul 2022 Conference number: 16 |
Conference
| Conference | 16th European workshop on lignocellulosics and pulp, EWLP 2022 |
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| Abbreviated title | EWLP 2022 |
| Country/Territory | Sweden |
| City | Gothenburg |
| Period | 28/06/22 → 1/07/22 |
Funding
This work was a part of the Academy of Finland's Flagship Programme under Projects No. 318890 and 318891 (Competence Center for Materials Bioeconomy, FinnCERES).
Keywords
- AlkOx
- prehydrolysis
- alkaline oxidation
- oxygen
- birch wood
- fractionation