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Evaluation of eucalyptus kraft pulp lignin through the nitrobenzene oxidation, copper oxide reduction and acidolysis techniques/Avaliacao da sensibilidade das analises da lignina residual pelos metodos de nitrobenzeno, oxido de cobre e acidolise

Ciência florestal, 2014-01, Vol.24 (1), p.205 [Peer Reviewed Journal]

COPYRIGHT 2014 Universidade Federal de Santa Maria ;ISSN: 1980-5098 ;EISSN: 1980-5098

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  • Title:
    Evaluation of eucalyptus kraft pulp lignin through the nitrobenzene oxidation, copper oxide reduction and acidolysis techniques/Avaliacao da sensibilidade das analises da lignina residual pelos metodos de nitrobenzeno, oxido de cobre e acidolise
  • Author: Ventorim, Gustavo ; Coelho, Alexandre ; Colodette, Jorge Luiz ; Alves, Ericka Figueiredo ; Comelato, Jaqueline Silveira
  • Subjects: Eucalyptus ; Forest products ; Lignin ; Materials research ; Wood-pulp
  • Is Part Of: Ciência florestal, 2014-01, Vol.24 (1), p.205
  • Description: This study aimed to evaluate the sensitiveness of the information obtained for the residual lignin from Eucalyptus granais kraft pulps analyzed through the nitrobenzene oxidation, copper oxide (CuO) reduction and acidolysis techniques. The chips were cooked, resulting pulps of kappa number 14,5 and 16,9, respectively. Both lignins' pulps were evaluated through three methods (nitrobenzene oxidation, copper oxide oxidation and acidolysis). Then, they were subjected to an oxygen delignification stage. The 16,9 kappa number pulp resulted in higher levels of non-condensed lignin structures by the acidolysis method, higher syringyl/vanillin ratios (S/V) by the nitrobenzene and copper oxide methods and better performance in the oxygen delignification stage. The different methods allowed to differ the residual lignin pulps with kappa number 14,5 and 16,9, and the nitrobenzene oxidation method showed the highest sensitiveness in this study results. Keywords: residual lignin; nitrobenzene oxidation; acidolysis; copper oxide. Este estudo teve com objetivo avaliar as sensibilidades das informacoes obtidas pelos procedimentos de analises de nitrobenzeno, oxido de cobre (CuO) e acidolise da lignina residual da polpa kraft de Eucalyptus granais. Foram efetuados cozimentos destes cavacos, originando duas polpas, com numeros kappa 14,5 e 16,9, respectivamente. Ambas as polpas tiveram a lignina avaliada por tres metodos (oxidacao com nitrobenzeno, oxido de cobre e acidolise) de caracterizacao da lignina residual presente na polpa marrom. Em seguida, foram submetidas a um estagio de deslignificacao com oxigenio. A polpa de numero kappa 16,9 resultou em maior teor de estruturas de ligninas nao condensadas pelo metodo da acidolise, maior relacao siringil/vanilina (S/V) pelos metodos de nitrobenzeno e oxido de cobre e apresentou uma maior deslignificacao no estagio com oxigenio. Os metodos empregados permitiram diferir as ligninas residuais das polpas com numero kappa 14,5 e 16,9, sendo que o metodo da oxidacao com nitrobenzeno apresentou a maior sensibilidade nos resultados encontrados deste estudo. Palavras-chave: lignina residual; oxidacao com nitrobenzeno; acidolise; oxido de cobre.
  • Publisher: Universidade Federal de Santa Maria
  • Language: Portuguese
  • Identifier: ISSN: 1980-5098
    EISSN: 1980-5098
  • Source: Open Access: DOAJ Directory of Open Access Journals
    Bioline International
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