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| 111. |  | KELLER, M. M.; PALACE, M. W.; SILVA, J. N. M.; ASNER, G. P. Selective Logging Effects on Carbon Budgets at Three Sites in the Brazilian Amazon. In: CONFERÊNCIA CIENTÍFICA DO LBA, 3., 2004, Brasília, DF. Anais de trabalhos completos. Brasília, DF: LBA, 2004. Resumo 21.3.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 118. | | AGUIAR, O. J. R. de; GOMES, J. I.; FIGUEIREDO, M. F. de; MARÇAL, A. S. Utilização de um polidor rotativo como acessório para a identificação macroscopica de madeiras. In: CONGRESSO NACIONAL DE BOTÂNICA, 54.; REUNIÃO AMAZÔNICA DE BOTÂNICA, 3., 2003, Belém, PA. Botânica: desafios da botânica brasileira no novo milênio: inventário, sistematização, conservação e uso da diversidade vegetal: resumos. Belém, PA: Sociedade Botânica do Brasil: UFRA: Museu Paraense Emílio Goeldi: Embrapa Amazônia Oriental, 2003. 1 CD-ROM.| Biblioteca(s): Embrapa Amazônia Oriental. |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Florestas. Para informações adicionais entre em contato com cnpf.biblioteca@embrapa.br. |
Registro Completo
|
Biblioteca(s): |
Embrapa Florestas. |
|
Data corrente: |
01/10/2015 |
|
Data da última atualização: |
29/01/2018 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
LOURENÇON, T. V.; HANSEL, F. A.; SILVA, T. A. da; RAMOS, L. P.; BOLZON DE MUNIZ, G. I.; MAGALHAES, W. L. E. |
|
Afiliação: |
TAINISE V. LOURENÇON, Doutoranda UFPR; FABRICIO AUGUSTO HANSEL, CNPF; THIAGO A. DA SILVA, UFPR; LUIZ P. RAMOS, UFPR; GRACIELA I. BOLZON DE MUNIZ, UFPR; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF. |
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Título: |
Hardwood and softwood kraft lignins fractionation by simple sequential acid precipitation. |
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Ano de publicação: |
2015 |
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Fonte/Imprenta: |
Separation and Purification Technology, v. 154, p. 82-88, Nov. 2015. |
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DOI: |
http://dx.doi.org/10.1016/j.seppur.2015.09.015 |
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Idioma: |
Inglês |
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Conteúdo: |
This study aimed at the fractionation of lignin by a simple acid precipitation from hardwood and softwood Kraft black liquors to propose new value-added applications. The precipitation was made sequentially by acidification at five different pHs (9, 7, 5, 3 and 1). The different lignin fractions were analyzed in terms of yield, ash content, elemental analysis, thermal analysis, FTIR, 1H NMR and GPC. Hardwood lignins showed distinct relative molecular mass distributions, while softwood lignins showed similar relative molecular mass distributions in the three fractions obtained at higher pHs (pH 9, 7 and 5). This simple acid precipitation was shown to be an effective method to obtain relatively high yields of lignin. Molecular characterization by FTIR (carbonyl band) indicated that hardwood lignin was most oxidized mainly in the low pH fractions (5, 3 and 1), while the softwood lignin only presented discrete oxidized products in the lowest pHs (3 and 1). Interestingly, precipitation at pH 3 produced ash-free hardwood and softwood lignin fractions, which is a valuable product for the development of better end uses. |
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Thesagro: |
Eucalipto; Lignina; Madeira. |
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Thesaurus NAL: |
Pinus. |
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Categoria do assunto: |
-- |
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Marc: |
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005 2018-01-29
008 2015 bl uuuu u00u1 u #d
024 7 $ahttp://dx.doi.org/10.1016/j.seppur.2015.09.015$2DOI
100 1 $aLOURENÇON, T. V.
245 $aHardwood and softwood kraft lignins fractionation by simple sequential acid precipitation.$h[electronic resource]
260 $c2015
520 $aThis study aimed at the fractionation of lignin by a simple acid precipitation from hardwood and softwood Kraft black liquors to propose new value-added applications. The precipitation was made sequentially by acidification at five different pHs (9, 7, 5, 3 and 1). The different lignin fractions were analyzed in terms of yield, ash content, elemental analysis, thermal analysis, FTIR, 1H NMR and GPC. Hardwood lignins showed distinct relative molecular mass distributions, while softwood lignins showed similar relative molecular mass distributions in the three fractions obtained at higher pHs (pH 9, 7 and 5). This simple acid precipitation was shown to be an effective method to obtain relatively high yields of lignin. Molecular characterization by FTIR (carbonyl band) indicated that hardwood lignin was most oxidized mainly in the low pH fractions (5, 3 and 1), while the softwood lignin only presented discrete oxidized products in the lowest pHs (3 and 1). Interestingly, precipitation at pH 3 produced ash-free hardwood and softwood lignin fractions, which is a valuable product for the development of better end uses.
650 $aPinus
650 $aEucalipto
650 $aLignina
650 $aMadeira
700 1 $aHANSEL, F. A.
700 1 $aSILVA, T. A. da
700 1 $aRAMOS, L. P.
700 1 $aBOLZON DE MUNIZ, G. I.
700 1 $aMAGALHAES, W. L. E.
773 $tSeparation and Purification Technology$gv. 154, p. 82-88, Nov. 2015.
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