Combined Production of Polymeric Birch Xylan and Paper Pulp by Alkaline Pre-extraction Followed by Alkaline Cooking
| Autor: | Kari Kovasin, Maija Tenkanen, Luciana Costabel, Lidia Testova, Annariikka Roselli, Herbert Sixta |
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| Rok vydání: | 2014 |
| Předmět: |
Molar mass
Chemistry General Chemical Engineering Pulp (paper) Papermaking technology industry and agriculture food and beverages macromolecular substances General Chemistry engineering.material Xylose Industrial and Manufacturing Engineering chemistry.chemical_compound Kraft process Enzymatic hydrolysis engineering Hardwood Xylooligosaccharide Nuclear chemistry |
| Zdroj: | Industrial & Engineering Chemistry Research. 53:8302-8310 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/ie500694c |
| Popis: | Alkaline pre-extraction of birch wood was performed to isolate polymeric xylan and subsequently produce a paper-grade pulp. At 95 °C and 2.5 mol/L NaOH, 7% of wood was transferred to the E-lye as polymeric xylan with an anhydroxylose-lignin ratio of 6.5. Xylan with a weight-average molar mass of 20 kDa was quantitatively precipitated from the solution previously concentrated from 7.4 to 37 g/L. The anhydroxylose-lignin ratio in the carbohydrate fraction increased to 29 g/g upon precipitation. Enzymatic hydrolysis of the commercial birch xylan with Pentopan Mono PG resulted in a uniform xylooligosaccharide product with low xylose content at a yield of 61%. The pre-extracted pulp had excellent papermaking properties but its yield was 4.9% units lower than that of the reference pulp. Commercial potential of the modified process was discussed. |
| Databáze: | OpenAIRE |
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