Selective hydrolysis of hexenuronic acid groups opens new possibilities for development of bleaching processes

Tapani Vuorinen*, Pirjo Fagerström, Erkki Räsänen, Anne Vikkula, Kaj Henricson, Anita Teleman

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

47 Citations (Scopus)

Abstract

Hexenuronic acid groups (HexA) in kraft pulps react with permanganate, chlorine, chlorine dioxide, ozone and peracids. HexA does not only increase bleaching chemical consumption in C-, D-, Z- and Paa-stages but is converted to products that are harmful in different aspects. A mild acid treatment hydrolyzes HexA strikingly selectively. Simultaneously the kappa number of a kraft pulp may decrease by several units. Only traces of other carbohydrate structures are dissolved. Cellulose is depolymerized to a limited extent but the selectivity of the treatment is still as high as in oxygen stage.
Original languageEnglish
Title of host publicationISWPC 9th International Symposium on Wood and Pulping Chemistry
Place of PublicationMontreal
PublisherCanadian Pulp and Paper Association (CPPA)
PagesM4-1-M4-4
ISBN (Print)1-896742-14-9
Publication statusPublished - 1997
MoE publication typeA4 Article in a conference publication
EventISWPC 9th International Symposium on Wood and Pulping Chemistry - Montreal, Canada
Duration: 9 Jun 199712 Jun 1997

Conference

ConferenceISWPC 9th International Symposium on Wood and Pulping Chemistry
Country/TerritoryCanada
CityMontreal
Period9/06/9712/06/97

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