دورية أكاديمية
WOOD CELLULOSE REMOVAL BY MEANS OF SELF- HYDROLYSIS TREATMENT
| العنوان: | WOOD CELLULOSE REMOVAL BY MEANS OF SELF- HYDROLYSIS TREATMENT |
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| المؤلفون: | Dalton Longue Júnior, Jorge Luiz Colodette |
| المصدر: | Ciência Florestal, Vol 21, Iss 3, Pp 541-550 (2011) |
| بيانات النشر: | Universidade Federal de Santa Maria, 2011. |
| سنة النشر: | 2011 |
| المجموعة: | LCC:Agriculture LCC:Forestry |
| مصطلحات موضوعية: | auto-hidrólise, remoção de hemiceluloses, xilanas, rendimento, Agriculture, Forestry, SD1-669.5 |
| الوصف: | The objective of this study was to assess the impact of removing hemicelluloses from chips of eucalyptus wood by self-hydrolysis treatment (H2O) and on the subsequent ‘kraft’ process behavior and pulps bleachability and quality. The self-hydrolysis treatments were conducted at temperatures of 152°C (30, 45 and 60 minutes); 160°C (15, 30 and 45 minutes); and 170°C (5, 10, 15, 20 and 30 minutes); water: wood ratio of 4:1 m3/t. Normal chips (reference) and self-hydrolyzed chips at 170°C during 5, 15 and 30 minutes were submitted to ‘kraft’ cooking up to kappa number 16 – 18 and the resulting pulp was bleached using the O/OD (EPO) DD sequence. According to the results obtained, self-hydrolyzing the chips at 170°C for 30 minutes allowed the removal of up to 60% hemicelluloses. Cooking yield of the self-hydrolyzed chips for 30 minutes was around 6% smaller and pentosan content 88% lower than that of the regular chips. The efficiency of delignification with oxygen of the pulp derived from self-hydrolyzed chips for 30 minutes was of 75%, compared to 43.6% of the reference-pulp, and the bleaching cost using the O/OD (EPO) DD sequence was US$ 7/adt per pulp, lower that that of the reference-pulp. The effluent originated from bleaching the pulp derived from the self-hydrolyzed chips presented lower values of COD (39.6%), color (21.3%) and AOX (51.6%), compared to that of the reference-pulp. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | Portuguese |
| تدمد: | 0103-9954 1980-5098 19805098 |
| Relation: | http://cascavel.ufsm.br/revistas/ojs-2.2.2/index.php/cienciaflorestal/article/view/3811; https://doaj.org/toc/0103-9954; https://doaj.org/toc/1980-5098 |
| DOI: | 10.5902/198050983811 |
| URL الوصول: | https://doaj.org/article/53ace417405b47dda6e48f95b67f3767 |
| رقم الأكسشن: | edsdoj.53ace417405b47dda6e48f95b67f3767 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 01039954 19805098 |
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| DOI: | 10.5902/198050983811 |