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 language | English |
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Title of host publication | ISWPC 9th International Symposium on Wood and Pulping Chemistry |
Place of Publication | Montreal |
Publisher | Canadian Pulp and Paper Association (CPPA) |
Pages | M4-1-M4-4 |
ISBN (Print) | 1-896742-14-9 |
Publication status | Published - 1997 |
MoE publication type | A4 Article in a conference publication |
Event | ISWPC 9th International Symposium on Wood and Pulping Chemistry - Montreal, Canada Duration: 9 Jun 1997 → 12 Jun 1997 |
Conference
Conference | ISWPC 9th International Symposium on Wood and Pulping Chemistry |
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Country/Territory | Canada |
City | Montreal |
Period | 9/06/97 → 12/06/97 |