Exploring the influence of initial liquor pH in the pre-hydrolysis stage on alpha-cellulose production from poplar
Abstract The effect of using auto pre-hydrolysis liquor, acidic pre-hydrolysis liquor, and alkaline pre-hydrolysis liquor on the production of alpha cellulose from poplar was investigated across this research work. Poplar chips were pulped with soda-AQ pulping process at a kappa number of 15 after being pre-hydrolyzed with different pre-hydrolysis liquors at 170 °C. The residual lignin of chips were more delignified by about 40% using a single stage oxygen delignification and totally bleached with a $ D_{0} $$ ED_{1} $ bleaching sequence. The results indicated that the yield and kappa number of the pulps can be affected by the kind of pre-hydrolysis liquor. In general, using acidic and alkaline catalysts in pre-hydrolysis liquor led to an acceleration in the rate of hemicellulose separation and kappa number reduction. The alkaline pre-hydrolysis and auto pre-hydrolysis had the highest and the least efficiency to remove hemicelluloses from the wood and purify the produced alpha cellulose, respectively. The alkaline pre-hydrolyzed dissolving pulp of poplar due to existing alkali catalyst in the pre-hydrolysis liquor and occurring alkaline darkening had the least brightness, while the acidic pre-hydrolyzed dissolving pulp, because of the effect of acidic catalyst on the reduction of chromophore compounds, had the highest brightness among the pulps. The results illustrated that a dissolving pulp with more purity and alpha-cellulose content is achievable from Poplar through employing an alkaline pre-hydrolysis stage, soda-AQ pulping, and $ OD_{0} $$ ED_{1} $ bleaching sequence..
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2018 |
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| Erschienen: |
2018 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:25 |
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| Enthalten in: |
Cellulose - 25(2018), 8 vom: 04. Juni, Seite 4783-4790 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Nikkhah Dafchahi, Mostafa [VerfasserIn] |
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| Links: |
Volltext [lizenzpflichtig] |
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| BKL: | |
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| Themen: |
Alpha cellulose |
| Anmerkungen: |
© Springer Science+Business Media B.V., part of Springer Nature 2018 |
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| doi: |
10.1007/s10570-018-1882-4 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| 245 | 1 | 0 | |a Exploring the influence of initial liquor pH in the pre-hydrolysis stage on alpha-cellulose production from poplar |
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| 520 | |a Abstract The effect of using auto pre-hydrolysis liquor, acidic pre-hydrolysis liquor, and alkaline pre-hydrolysis liquor on the production of alpha cellulose from poplar was investigated across this research work. Poplar chips were pulped with soda-AQ pulping process at a kappa number of 15 after being pre-hydrolyzed with different pre-hydrolysis liquors at 170 °C. The residual lignin of chips were more delignified by about 40% using a single stage oxygen delignification and totally bleached with a $ D_{0} $$ ED_{1} $ bleaching sequence. The results indicated that the yield and kappa number of the pulps can be affected by the kind of pre-hydrolysis liquor. In general, using acidic and alkaline catalysts in pre-hydrolysis liquor led to an acceleration in the rate of hemicellulose separation and kappa number reduction. The alkaline pre-hydrolysis and auto pre-hydrolysis had the highest and the least efficiency to remove hemicelluloses from the wood and purify the produced alpha cellulose, respectively. The alkaline pre-hydrolyzed dissolving pulp of poplar due to existing alkali catalyst in the pre-hydrolysis liquor and occurring alkaline darkening had the least brightness, while the acidic pre-hydrolyzed dissolving pulp, because of the effect of acidic catalyst on the reduction of chromophore compounds, had the highest brightness among the pulps. The results illustrated that a dissolving pulp with more purity and alpha-cellulose content is achievable from Poplar through employing an alkaline pre-hydrolysis stage, soda-AQ pulping, and $ OD_{0} $$ ED_{1} $ bleaching sequence. | ||
| 650 | 4 | |a Alpha cellulose | |
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| 700 | 1 | |a Saraeyan, Ahmad Reza |4 aut | |
| 700 | 1 | |a Ghasemian, Ali |4 aut | |
| 700 | 1 | |a Shakeri, Ali Reza |4 aut | |
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