Efeito do teor de lignina da madeira de Eucalyptus globulus Labill. no desempenho da polpação kraft
In this research, it was analyzed the lignin content effect of Eucalyptus globulus Labill. wood in kraft pulping optimization. Seventy-two laboratory cooking were made with wood chips obtained from six Eucalyptus globulus trees selected from a group of 50 trees. The wood chips from three trees with...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | Portuguese |
| Published: |
Universidade Federal de Santa Maria
2011-01-01
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| Series: | Ciência Florestal |
| Online Access: | http://www.redalyc.org/articulo.oa?id=53418579017 |
| _version_ | 1818971011493658624 |
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| author | Gabriel Valim Cardoso Celso Edmundo Bochetti Foelkel Sonia Maria Bitencourt Frizzo Claudia Adriana Broglio da Rosa Teotônio Francisco de Assis Patrícia de Oliveira |
| author_facet | Gabriel Valim Cardoso Celso Edmundo Bochetti Foelkel Sonia Maria Bitencourt Frizzo Claudia Adriana Broglio da Rosa Teotônio Francisco de Assis Patrícia de Oliveira |
| author_sort | Gabriel Valim Cardoso |
| collection | DOAJ |
| description | In this research, it was analyzed the lignin content effect of Eucalyptus globulus Labill. wood in kraft pulping optimization. Seventy-two laboratory cooking were made with wood chips obtained from six Eucalyptus globulus trees selected from a group of 50 trees. The wood chips from three trees with the lowest lignin content, with average 20.53%, were mixed proportionally based on the tree weights, obtaining the sample of low lignin content wood. The same was made to obtain the sample for wood chips with the highest lignin content, with average 23.02%. The two lignin levels were statistically different. The two wood samples had basic densities statistically not different. Using three maximum temperatures levels (160, 165 and 170ºC), and three active alkali charged (17, 18.5 and 20%), the wood chips were converted to kraft pulps. The pulps were then characterized to analyze the influence of the distinct treatments employed in the cooking on their properties. The effect of the cooking conditions was expressed by mathematical models in order to determine the optimum points for each of the evaluated properties. The optimization process indicated maximum temperature of 168ºC, and active alkali of 19%, for maximum kraft pulping yield to achieve kappa number 18; this result was for woods with low lignin content. For woods containing the high lignin content, the optimization showed maximum cooking temperature of 169ºC and active alkali of 19% for kappa number of 18. The average reduction of 2.49% in wood lignin content resulted a correspondent gain of 2.2% in the kraft yield (o.d. basis) and a reduction on the active alkali charge of 1.2% (o.d. basis) to achieve kappa numbers from 16 to 19, preserving pulp properties. If the option is to work with kappa number 19 instead of 16, the gain in kraft yield is approximately 2%. Therefore, when working with low lignin content wood and kappa number 19 instead of 16, a substantial gain of approximately 4.2% is obtained for kraft pulp yield, and additionally 2 to 2.5% reduction in the active alkali charge based on o.d. wood. |
| first_indexed | 2024-12-20T14:45:35Z |
| format | Article |
| id | doaj.art-69785e98a0444400b497d3905bdd44ba |
| institution | Directory Open Access Journal |
| issn | 0103-9954 1980-5098 |
| language | Portuguese |
| last_indexed | 2024-12-20T14:45:35Z |
| publishDate | 2011-01-01 |
| publisher | Universidade Federal de Santa Maria |
| record_format | Article |
| series | Ciência Florestal |
| spelling | doaj.art-69785e98a0444400b497d3905bdd44ba2022-12-21T19:37:08ZporUniversidade Federal de Santa MariaCiência Florestal0103-99541980-50982011-01-01211133147Efeito do teor de lignina da madeira de Eucalyptus globulus Labill. no desempenho da polpação kraftGabriel Valim CardosoCelso Edmundo Bochetti FoelkelSonia Maria Bitencourt FrizzoClaudia Adriana Broglio da RosaTeotônio Francisco de AssisPatrícia de OliveiraIn this research, it was analyzed the lignin content effect of Eucalyptus globulus Labill. wood in kraft pulping optimization. Seventy-two laboratory cooking were made with wood chips obtained from six Eucalyptus globulus trees selected from a group of 50 trees. The wood chips from three trees with the lowest lignin content, with average 20.53%, were mixed proportionally based on the tree weights, obtaining the sample of low lignin content wood. The same was made to obtain the sample for wood chips with the highest lignin content, with average 23.02%. The two lignin levels were statistically different. The two wood samples had basic densities statistically not different. Using three maximum temperatures levels (160, 165 and 170ºC), and three active alkali charged (17, 18.5 and 20%), the wood chips were converted to kraft pulps. The pulps were then characterized to analyze the influence of the distinct treatments employed in the cooking on their properties. The effect of the cooking conditions was expressed by mathematical models in order to determine the optimum points for each of the evaluated properties. The optimization process indicated maximum temperature of 168ºC, and active alkali of 19%, for maximum kraft pulping yield to achieve kappa number 18; this result was for woods with low lignin content. For woods containing the high lignin content, the optimization showed maximum cooking temperature of 169ºC and active alkali of 19% for kappa number of 18. The average reduction of 2.49% in wood lignin content resulted a correspondent gain of 2.2% in the kraft yield (o.d. basis) and a reduction on the active alkali charge of 1.2% (o.d. basis) to achieve kappa numbers from 16 to 19, preserving pulp properties. If the option is to work with kappa number 19 instead of 16, the gain in kraft yield is approximately 2%. Therefore, when working with low lignin content wood and kappa number 19 instead of 16, a substantial gain of approximately 4.2% is obtained for kraft pulp yield, and additionally 2 to 2.5% reduction in the active alkali charge based on o.d. wood.http://www.redalyc.org/articulo.oa?id=53418579017 |
| spellingShingle | Gabriel Valim Cardoso Celso Edmundo Bochetti Foelkel Sonia Maria Bitencourt Frizzo Claudia Adriana Broglio da Rosa Teotônio Francisco de Assis Patrícia de Oliveira Efeito do teor de lignina da madeira de Eucalyptus globulus Labill. no desempenho da polpação kraft Ciência Florestal |
| title | Efeito do teor de lignina da madeira de Eucalyptus globulus Labill. no desempenho da polpação kraft |
| title_full | Efeito do teor de lignina da madeira de Eucalyptus globulus Labill. no desempenho da polpação kraft |
| title_fullStr | Efeito do teor de lignina da madeira de Eucalyptus globulus Labill. no desempenho da polpação kraft |
| title_full_unstemmed | Efeito do teor de lignina da madeira de Eucalyptus globulus Labill. no desempenho da polpação kraft |
| title_short | Efeito do teor de lignina da madeira de Eucalyptus globulus Labill. no desempenho da polpação kraft |
| title_sort | efeito do teor de lignina da madeira de eucalyptus globulus labill no desempenho da polpacao kraft |
| url | http://www.redalyc.org/articulo.oa?id=53418579017 |
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