发明名称 |
SAUERSTOFFDELIGNIFIZIERUNG VON LIGNOCELLULOSCHISCHEM ZELLSTOFF IN ZWEI STUFEN |
摘要 |
Methods for oxygen delignification of a pulp are disclosed, including initially delignifying the pulp at a delignification temperature of less than 90� C., adding oxygen to the pulp so that the oxygen is present during the initial delignification step, and further delignifying the pulp at a delignification temperature of greater than 90� C., the difference between the two delignification temperatures being less than about 20� C., and the pressure being greater in the initial delignification step. The method also includes adding alkali solely to the initial delignification step in order to obtain high alkalinity therein. |
申请公布号 |
DE69630803(D1) |
申请公布日期 |
2003.12.24 |
申请号 |
DE1996630803 |
申请日期 |
1996.09.18 |
申请人 |
VALMET FIBERTECH AB, SUNDSVALL |
发明人 |
BOKSTROEM, MONICA;MELLANDER, PIA;NORDEN, SOLVEIG |
分类号 |
D21C9/10;D21C9/147;(IPC1-7):D21C9/147 |
主分类号 |
D21C9/10 |
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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