Efeito dos ácidos hexenurônicos e da lignina no desempenho da ozonólize, em diferentes pHs da reação

Efeito dos ácidos hexenurônicos e da lignina no desempenho da ozonólize, em diferentes pHs da reação

The effect of pH on the performance of the ozonolysis stage in pulp production was evaluated for conventional and acid treated brown and oxygen delignified eucalyptus kraft pulps. The objective was to determine separately the effects of lignin and hexenuronic acid on the performance of the ozonolysis stage. The reaction of ozone with hexenuronic acid is less sensitive to pH than the reaction of ozone with lignin. The efficiency and the selectivity of the reaction of ozone with pulp decreases after removal of hexenuronic acids. Increasing up to 7.0 the pH during the ozonolysis is viable in the sequence Z/D(EOP)D, resulting in savings of H2SO4 (8,5 kg/tsa) and NaOH (5 kg/tsa), but is not recommended in the sequence Z/ED(PO).

Saved in:
Bibliographic Details
Main Authors: Ventorim,Gustavo, Colodette,Jorge Luiz
Format: Digital revista
Language:Portuguese
Published: Sociedade Brasileira de Química 2006
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422006000500007
Tags: Add Tag
No Tags, Be the first to tag this record!
id oai:scielo:S0100-40422006000500007
record_format ojs
spelling oai:scielo:S0100-404220060005000072011-09-06Efeito dos ácidos hexenurônicos e da lignina no desempenho da ozonólize, em diferentes pHs da reaçãoVentorim,GustavoColodette,Jorge Luiz ozone brown pulp oxygen delignification The effect of pH on the performance of the ozonolysis stage in pulp production was evaluated for conventional and acid treated brown and oxygen delignified eucalyptus kraft pulps. The objective was to determine separately the effects of lignin and hexenuronic acid on the performance of the ozonolysis stage. The reaction of ozone with hexenuronic acid is less sensitive to pH than the reaction of ozone with lignin. The efficiency and the selectivity of the reaction of ozone with pulp decreases after removal of hexenuronic acids. Increasing up to 7.0 the pH during the ozonolysis is viable in the sequence Z/D(EOP)D, resulting in savings of H2SO4 (8,5 kg/tsa) and NaOH (5 kg/tsa), but is not recommended in the sequence Z/ED(PO).info:eu-repo/semantics/openAccessSociedade Brasileira de QuímicaQuímica Nova v.29 n.5 20062006-10-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422006000500007pt10.1590/S0100-40422006000500007
institution SCIELO
collection OJS
country Brasil
countrycode BR
component Revista
access En linea
databasecode rev-scielo-br
tag revista
region America del Sur
libraryname SciELO
language Portuguese
format Digital
author Ventorim,Gustavo
Colodette,Jorge Luiz
spellingShingle Ventorim,Gustavo
Colodette,Jorge Luiz
Efeito dos ácidos hexenurônicos e da lignina no desempenho da ozonólize, em diferentes pHs da reação
author_facet Ventorim,Gustavo
Colodette,Jorge Luiz
author_sort Ventorim,Gustavo
title Efeito dos ácidos hexenurônicos e da lignina no desempenho da ozonólize, em diferentes pHs da reação
title_short Efeito dos ácidos hexenurônicos e da lignina no desempenho da ozonólize, em diferentes pHs da reação
title_full Efeito dos ácidos hexenurônicos e da lignina no desempenho da ozonólize, em diferentes pHs da reação
title_fullStr Efeito dos ácidos hexenurônicos e da lignina no desempenho da ozonólize, em diferentes pHs da reação
title_full_unstemmed Efeito dos ácidos hexenurônicos e da lignina no desempenho da ozonólize, em diferentes pHs da reação
title_sort efeito dos ácidos hexenurônicos e da lignina no desempenho da ozonólize, em diferentes phs da reação
description The effect of pH on the performance of the ozonolysis stage in pulp production was evaluated for conventional and acid treated brown and oxygen delignified eucalyptus kraft pulps. The objective was to determine separately the effects of lignin and hexenuronic acid on the performance of the ozonolysis stage. The reaction of ozone with hexenuronic acid is less sensitive to pH than the reaction of ozone with lignin. The efficiency and the selectivity of the reaction of ozone with pulp decreases after removal of hexenuronic acids. Increasing up to 7.0 the pH during the ozonolysis is viable in the sequence Z/D(EOP)D, resulting in savings of H2SO4 (8,5 kg/tsa) and NaOH (5 kg/tsa), but is not recommended in the sequence Z/ED(PO).
publisher Sociedade Brasileira de Química
publishDate 2006
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422006000500007
work_keys_str_mv AT ventorimgustavo efeitodosacidoshexenuronicosedaligninanodesempenhodaozonolizeemdiferentesphsdareacao
AT colodettejorgeluiz efeitodosacidoshexenuronicosedaligninanodesempenhodaozonolizeemdiferentesphsdareacao
_version_ 1756387184299999232

Similar Items