HEXENURONIC ACID REMOVAL FROM UNBLEACHED KRAFT EUCALYPTUS PULP BY PEROXYMONOSULFURIC ACID

The use of peroxymonosulphuric (Ps) acid to remove hexenuronic acid (HexA) present in unbleached eucalyptus kraft pulps was evaluated here. HexA is formed during pulping and is held responsible for reagent consumption during bleaching. Laboratory experiments, using oxygen predelignified eucalyptus k...

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Autores principales:	PETIT-BREUILH,XIMENA, ZAROR,CLAUDIO, MELO,ROBERTO
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2004
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072004000400016
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spelling	oai:scielo:S0717-970720040004000162005-09-13HEXENURONIC ACID REMOVAL FROM UNBLEACHED KRAFT EUCALYPTUS PULP BY PEROXYMONOSULFURIC ACIDPETIT-BREUILH,XIMENAZAROR,CLAUDIOMELO,ROBERTOThe use of peroxymonosulphuric (Ps) acid to remove hexenuronic acid (HexA) present in unbleached eucalyptus kraft pulps was evaluated here. HexA is formed during pulping and is held responsible for reagent consumption during bleaching. Laboratory experiments, using oxygen predelignified eucalyptus kraft pulps (kappa number around 9), treated at 20-110C and 0.2-1.0%Ps, were conducted here, Experimental results show that Ps effectively removed both HexA and lignin, even under mild conditions. Selectivity towards HexA increased at higher temperature and lower Ps loads. However, at lower temperatures and higher Ps concentrations, cellulose was also attacked. As a result of Ps pre-treatment, ClO2 savings in pulp bleaching in the range 40-79% were determined here. Moreover, all Ps pretreated pulps yielded higher brightness than untreated pulps. Furthermore, lower AOX emissions occurred as a result of lower ClO2 loads. However, moderate Ps pre-treatment conditions were necessary to obtain a bleached pulp with acceptable mechanical properties. Results reported here show that HexA removal by Ps offers an interesting option for industrial implementation, both from an economic and environmental point of viewinfo:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.49 n.4 20042004-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072004000400016en10.4067/S0717-97072004000400016
institution	Scielo Chile
collection	Scielo Chile
language	English
description	The use of peroxymonosulphuric (Ps) acid to remove hexenuronic acid (HexA) present in unbleached eucalyptus kraft pulps was evaluated here. HexA is formed during pulping and is held responsible for reagent consumption during bleaching. Laboratory experiments, using oxygen predelignified eucalyptus kraft pulps (kappa number around 9), treated at 20-110C and 0.2-1.0%Ps, were conducted here, Experimental results show that Ps effectively removed both HexA and lignin, even under mild conditions. Selectivity towards HexA increased at higher temperature and lower Ps loads. However, at lower temperatures and higher Ps concentrations, cellulose was also attacked. As a result of Ps pre-treatment, ClO2 savings in pulp bleaching in the range 40-79% were determined here. Moreover, all Ps pretreated pulps yielded higher brightness than untreated pulps. Furthermore, lower AOX emissions occurred as a result of lower ClO2 loads. However, moderate Ps pre-treatment conditions were necessary to obtain a bleached pulp with acceptable mechanical properties. Results reported here show that HexA removal by Ps offers an interesting option for industrial implementation, both from an economic and environmental point of view
author	PETIT-BREUILH,XIMENA ZAROR,CLAUDIO MELO,ROBERTO
spellingShingle	PETIT-BREUILH,XIMENA ZAROR,CLAUDIO MELO,ROBERTO HEXENURONIC ACID REMOVAL FROM UNBLEACHED KRAFT EUCALYPTUS PULP BY PEROXYMONOSULFURIC ACID
author_facet	PETIT-BREUILH,XIMENA ZAROR,CLAUDIO MELO,ROBERTO
author_sort	PETIT-BREUILH,XIMENA
title	HEXENURONIC ACID REMOVAL FROM UNBLEACHED KRAFT EUCALYPTUS PULP BY PEROXYMONOSULFURIC ACID
title_short	HEXENURONIC ACID REMOVAL FROM UNBLEACHED KRAFT EUCALYPTUS PULP BY PEROXYMONOSULFURIC ACID
title_full	HEXENURONIC ACID REMOVAL FROM UNBLEACHED KRAFT EUCALYPTUS PULP BY PEROXYMONOSULFURIC ACID
title_fullStr	HEXENURONIC ACID REMOVAL FROM UNBLEACHED KRAFT EUCALYPTUS PULP BY PEROXYMONOSULFURIC ACID
title_full_unstemmed	HEXENURONIC ACID REMOVAL FROM UNBLEACHED KRAFT EUCALYPTUS PULP BY PEROXYMONOSULFURIC ACID
title_sort	hexenuronic acid removal from unbleached kraft eucalyptus pulp by peroxymonosulfuric acid
publisher	Sociedad Chilena de Química
publishDate	2004
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072004000400016
work_keys_str_mv	AT petitbreuilhximena hexenuronicacidremovalfromunbleachedkrafteucalyptuspulpbyperoxymonosulfuricacid AT zarorclaudio hexenuronicacidremovalfromunbleachedkrafteucalyptuspulpbyperoxymonosulfuricacid AT meloroberto hexenuronicacidremovalfromunbleachedkrafteucalyptuspulpbyperoxymonosulfuricacid
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HEXENURONIC ACID REMOVAL FROM UNBLEACHED KRAFT EUCALYPTUS PULP BY PEROXYMONOSULFURIC ACID

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