发明名称 |
METHOD FOR REMOVAL OF HEXENURONIC ACID GROUPS IN CELLULOSE PULP BY HEAT TREATMENT |
摘要 |
Pulp, in particular hardwood pulps, is delignified in cooking and, when needed, further delignified with oxygen to a kappa number below (24), preferably below (14). The delignified pulp is heated and treated at a temperature of about 85 to 150 DEG C, preferably 90 to 110 DEG C, at a pH of about 2 to 5 in order to decrease the kappa number by 2 to 9 units by removing at least 50 % of the hexenuronic acid groups in the pulp. The treated pulp is bleached in at least one bleaching stage.
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申请公布号 |
WO9612063(A1) |
申请公布日期 |
1996.04.25 |
申请号 |
WO1995FI00566 |
申请日期 |
1995.10.12 |
申请人 |
A. AHLSTROM CORPORATION;VUORINEN, TAPANI;BUCHERT, JOHANNA;TELEMAN, ANITA;TENKANEN, MAIJA |
发明人 |
VUORINEN, TAPANI;BUCHERT, JOHANNA;TELEMAN, ANITA;TENKANEN, MAIJA |
分类号 |
D21C;D21C9/00;D21C9/10;D21C9/14;D21C9/147;(IPC1-7):D21C9/00 |
主分类号 |
D21C |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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