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| Format: | Artículo científico |
| Language: | en |
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Universidade Federal de Lavras
2018
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| Online Access: | https://www.redalyc.org/articulo.oa?id=74460240013 https://www.redalyc.org/journal/744/74460240013/ https://www.redalyc.org/journal/744/74460240013/html/ https://www.redalyc.org/journal/744/74460240013/74460240013.epub https://www.redalyc.org/journal/744/74460240013/movil |
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| _version_ | 1866814451990134784 |
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| author | Robisnéa Adriana Ribeiro |
| author_facet | Robisnéa Adriana Ribeiro |
| contents | EFFECT OF RESIDUAL EFFECTIVE ALKALI ON EUCALYPTUS KRAFT PULP YIELD AND CHEMISTRY Robisnéa Adriana Ribeiro Jorge Luiz Colodette Sílvio Vaz Júnior Agrociencias Yield Eucalyptus Kappa number The impact of residual effective alkali (REA) and pulp delignification degree on Eucalyptus kraft pulp yield and chemistry was investigated. In this study four types of eucalypt clones were evaluated. The eucalypt woods were cooked to kappa numbers of 14±1, 18±1, 22±1 and 26±1 using two different ranges of REA, namely: low-REA (1-2 g.L-1) and high-REA (8-9 g.L-1). In general, the low-REA cooks lead to pulps of higher yield, viscosity and xylans content and lower brightness and hexenuronic acid (HexA) content, in relation to the high-REA cooks. In addition, the low-REA cooks required about 20% less effective alkali to achieve the target kappa, in spite of demanding about 50% more H-factor. Similar trends were observed for the other woods and kappa values evaluated, but the level of gains varied substantially among woods and delignification degrees. Among the various woods, E. globulus was the easiest to delignify. There was a trend of higher brown pulp yield for the cooks terminated at higher kappa in the range of 14-26, but the lignin-HexA free screen yields were about similar in the kappa range of 18-26 for a given wood type. 2018 artículo científico 0104-7760 https://www.redalyc.org/articulo.oa?id=74460240013 https://www.redalyc.org/journal/744/74460240013/ https://www.redalyc.org/journal/744/74460240013/html/ https://www.redalyc.org/journal/744/74460240013/74460240013.epub https://www.redalyc.org/journal/744/74460240013/movil 10.1590/01047760201824042593 en http://www.redalyc.org/revista.oa?id=744 CERNE application/pdf Universidade Federal de Lavras CERNE (Brasil) Num.4 Vol.24 |
| format | Artículo científico |
| id | redalyc_74460240013 |
| language | en |
| publishDate | 2018 |
| publisher | Universidade Federal de Lavras |
| spellingShingle | EFFECT OF RESIDUAL EFFECTIVE ALKALI ON EUCALYPTUS KRAFT PULP YIELD AND CHEMISTRY Robisnéa Adriana Ribeiro Agrociencias Yield Eucalyptus Kappa number EFFECT OF RESIDUAL EFFECTIVE ALKALI ON EUCALYPTUS KRAFT PULP YIELD AND CHEMISTRY Robisnéa Adriana Ribeiro Jorge Luiz Colodette Sílvio Vaz Júnior Agrociencias Yield Eucalyptus Kappa number The impact of residual effective alkali (REA) and pulp delignification degree on Eucalyptus kraft pulp yield and chemistry was investigated. In this study four types of eucalypt clones were evaluated. The eucalypt woods were cooked to kappa numbers of 14±1, 18±1, 22±1 and 26±1 using two different ranges of REA, namely: low-REA (1-2 g.L-1) and high-REA (8-9 g.L-1). In general, the low-REA cooks lead to pulps of higher yield, viscosity and xylans content and lower brightness and hexenuronic acid (HexA) content, in relation to the high-REA cooks. In addition, the low-REA cooks required about 20% less effective alkali to achieve the target kappa, in spite of demanding about 50% more H-factor. Similar trends were observed for the other woods and kappa values evaluated, but the level of gains varied substantially among woods and delignification degrees. Among the various woods, E. globulus was the easiest to delignify. There was a trend of higher brown pulp yield for the cooks terminated at higher kappa in the range of 14-26, but the lignin-HexA free screen yields were about similar in the kappa range of 18-26 for a given wood type. 2018 artículo científico 0104-7760 https://www.redalyc.org/articulo.oa?id=74460240013 https://www.redalyc.org/journal/744/74460240013/ https://www.redalyc.org/journal/744/74460240013/html/ https://www.redalyc.org/journal/744/74460240013/74460240013.epub https://www.redalyc.org/journal/744/74460240013/movil 10.1590/01047760201824042593 en http://www.redalyc.org/revista.oa?id=744 CERNE application/pdf Universidade Federal de Lavras CERNE (Brasil) Num.4 Vol.24 |
| title | EFFECT OF RESIDUAL EFFECTIVE ALKALI ON EUCALYPTUS KRAFT PULP YIELD AND CHEMISTRY |
| topic | Agrociencias Yield Eucalyptus Kappa number |
| url | https://www.redalyc.org/articulo.oa?id=74460240013 https://www.redalyc.org/journal/744/74460240013/ https://www.redalyc.org/journal/744/74460240013/html/ https://www.redalyc.org/journal/744/74460240013/74460240013.epub https://www.redalyc.org/journal/744/74460240013/movil |