Ozonólise das ligninas organossolve e kraft eucalipto. Parte II: cinética nos meios ácido e básico

Detalhes bibliográficos
Autor(a) principal: Nascimento,Evandro A.
Data de Publicação: 1998
Outros Autores: Morais,Sérgio A. L., Aquino,Francisco J. T., Piló - Veloso,Dorila
Tipo de documento: Artigo
Idioma: por
Título da fonte: Química Nova (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421998000500009
Resumo: Organosolv and kraft lignins were treated with ozone both in basic and acid media and the reaction was studied kinetically. In contrast to reported studies, ozone was more efective in basic medium. Kraft lignin was degraded faster than organosolv lignin in both media but in the basic medium the rate of reaction was very much faster than in the acid one: for kraft lignin, the observed degradation was 93% for 2 min of reaction in the basic medium and 56% for 10 min of reaction in the acid medium; for organosolv lignin, 47% and 25%, respectively, in the same times. Higher phenolic hydroxyl groups contents increase the reaction rate.
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spelling Ozonólise das ligninas organossolve e kraft eucalipto. Parte II: cinética nos meios ácido e básicoozonolysisozone bleachingorganosolv and kraft ligninsOrganosolv and kraft lignins were treated with ozone both in basic and acid media and the reaction was studied kinetically. In contrast to reported studies, ozone was more efective in basic medium. Kraft lignin was degraded faster than organosolv lignin in both media but in the basic medium the rate of reaction was very much faster than in the acid one: for kraft lignin, the observed degradation was 93% for 2 min of reaction in the basic medium and 56% for 10 min of reaction in the acid medium; for organosolv lignin, 47% and 25%, respectively, in the same times. Higher phenolic hydroxyl groups contents increase the reaction rate.Sociedade Brasileira de Química1998-10-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421998000500009Química Nova v.21 n.5 1998reponame:Química Nova (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0100-40421998000500009info:eu-repo/semantics/openAccessNascimento,Evandro A.Morais,Sérgio A. L.Aquino,Francisco J. T.Piló - Veloso,Dorilapor2001-05-07T00:00:00Zoai:scielo:S0100-40421998000500009Revistahttps://www.scielo.br/j/qn/ONGhttps://old.scielo.br/oai/scielo-oai.phpquimicanova@sbq.org.br1678-70640100-4042opendoar:2001-05-07T00:00Química Nova (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Ozonólise das ligninas organossolve e kraft eucalipto. Parte II: cinética nos meios ácido e básico
title Ozonólise das ligninas organossolve e kraft eucalipto. Parte II: cinética nos meios ácido e básico
spellingShingle Ozonólise das ligninas organossolve e kraft eucalipto. Parte II: cinética nos meios ácido e básico
Nascimento,Evandro A.
ozonolysis
ozone bleaching
organosolv and kraft lignins
title_short Ozonólise das ligninas organossolve e kraft eucalipto. Parte II: cinética nos meios ácido e básico
title_full Ozonólise das ligninas organossolve e kraft eucalipto. Parte II: cinética nos meios ácido e básico
title_fullStr Ozonólise das ligninas organossolve e kraft eucalipto. Parte II: cinética nos meios ácido e básico
title_full_unstemmed Ozonólise das ligninas organossolve e kraft eucalipto. Parte II: cinética nos meios ácido e básico
title_sort Ozonólise das ligninas organossolve e kraft eucalipto. Parte II: cinética nos meios ácido e básico
author Nascimento,Evandro A.
author_facet Nascimento,Evandro A.
Morais,Sérgio A. L.
Aquino,Francisco J. T.
Piló - Veloso,Dorila
author_role author
author2 Morais,Sérgio A. L.
Aquino,Francisco J. T.
Piló - Veloso,Dorila
author2_role author
author
author
dc.contributor.author.fl_str_mv Nascimento,Evandro A.
Morais,Sérgio A. L.
Aquino,Francisco J. T.
Piló - Veloso,Dorila
dc.subject.por.fl_str_mv ozonolysis
ozone bleaching
organosolv and kraft lignins
topic ozonolysis
ozone bleaching
organosolv and kraft lignins
description Organosolv and kraft lignins were treated with ozone both in basic and acid media and the reaction was studied kinetically. In contrast to reported studies, ozone was more efective in basic medium. Kraft lignin was degraded faster than organosolv lignin in both media but in the basic medium the rate of reaction was very much faster than in the acid one: for kraft lignin, the observed degradation was 93% for 2 min of reaction in the basic medium and 56% for 10 min of reaction in the acid medium; for organosolv lignin, 47% and 25%, respectively, in the same times. Higher phenolic hydroxyl groups contents increase the reaction rate.
publishDate 1998
dc.date.none.fl_str_mv 1998-10-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421998000500009
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421998000500009
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv 10.1590/S0100-40421998000500009
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Química
publisher.none.fl_str_mv Sociedade Brasileira de Química
dc.source.none.fl_str_mv Química Nova v.21 n.5 1998
reponame:Química Nova (Online)
instname:Sociedade Brasileira de Química (SBQ)
instacron:SBQ
instname_str Sociedade Brasileira de Química (SBQ)
instacron_str SBQ
institution SBQ
reponame_str Química Nova (Online)
collection Química Nova (Online)
repository.name.fl_str_mv Química Nova (Online) - Sociedade Brasileira de Química (SBQ)
repository.mail.fl_str_mv quimicanova@sbq.org.br
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