Stabilization, degradation, and dissolution behavior of Scots pine polysaccharides during polysulfide (K-PS) and polysulfide anthraquinone (K-PSAQ) pulping
| العنوان: | Stabilization, degradation, and dissolution behavior of Scots pine polysaccharides during polysulfide (K-PS) and polysulfide anthraquinone (K-PSAQ) pulping |
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| المؤلفون: | Herbert Sixta, Markus Paananen, Stella Rovio, Tiina Liitiä |
| المصدر: | Holzforschung. 69:1049-1058 |
| بيانات النشر: | Walter de Gruyter GmbH, 2015. |
| سنة النشر: | 2015 |
| مصطلحات موضوعية: | Materials science, Softwood, biology, Formic acid, Scots pine, biology.organism_classification, Anthraquinone, Biomaterials, chemistry.chemical_compound, stomatognathic system, chemistry, Degradation (geology), Organic chemistry, Cellulose, Dissolution, Polysulfide, Nuclear chemistry |
| الوصف: | The behavior of Scots pine (Pinus sylvestris L.) polysaccharides was studied during modified kraft pulping processes of wood meal by polysulfide (K-PS) and polysulfide anthraquinone (K-PSAQ) at the hydroxide ion concentrations of 0.50 and 1.55 M [OH-] with a high liquor-to-wood (L/W) ratio of 200. The high L/W ratio was selected for avoiding diffusion phenomena and to be able to focus on the chemistry of polysaccharides. A comparison with the kraft process reference at 160°C revealed a substantial increase in pulp yield (6–7% in K-PS pulping and 7.5–10.5% in K-PSAQ pulping) mainly attributed to galactoglucomannan (GGM) stabilization. Due to the rapid delignification rate at 1.55 M [OH-] concentration, the temperature could be lowered from 160°C to 130°C without a notable prolongation of cooking time. In K-PS pulping at 130°C, no additional GGM stability was observed compared to 160°C, whereas cellulose and arabinoxylan preservation was improved. In K-PSAQ pulping, GGM preservation was also significantly improved. At 130°C, pulp yield increase of approximately 8% in PS pulping and more than 11% in PSAQ pulping was observed. The amount of dissolved softwood hemicelluloses in black liquor was significantly increased at the higher [OH-] level and even further in the presence of PS and AQ. Simultaneously, the formation of hydroxy acids was decreased, indicating a significant stabilization of the dissolved polysaccharide fraction parallel to the pulp polysaccharides. |
| تدمد: | 1437-434X 0018-3830 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::11f2c5c9083d6f783c88e13c66a3adb4 https://doi.org/10.1515/hf-2014-0220 |
| رقم الأكسشن: | edsair.doi...........11f2c5c9083d6f783c88e13c66a3adb4 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 1437434X 00183830 |
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