发明名称 |
Oxygen delignification of pulp in two stages with low pressure steam heating between stages |
摘要 |
Methods for oxygen delignification of chemical pulps are disclosed including contacting the chemical pulp with oxygen first in an upstream reactor vessel and then in a downstream reactor vessel. The upstream reactor vessel is maintained at pressures of greater than about 3 bar, and the downstream reactor vessel is maintained at temperatures of between about 90 and 120° C. and corresponding predetermined pressures. Heating of the partially delignified chemical pulp between the upstream and downstream reactors is accomplished by contacting the partially delignified chemical pulp with low pressure steam.
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申请公布号 |
US6221207(B1) |
申请公布日期 |
2001.04.24 |
申请号 |
US19980155119 |
申请日期 |
1998.09.22 |
申请人 |
VALMET FIBERTECH AKTIEBOLAG |
发明人 |
FORSLUND KJELL;LARSSON RUNE;SUNDIN MATTS;BOKSTROEM MONICA |
分类号 |
D21C9/10;D21C9/147;(IPC1-7):D21C9/147;D21C9/16 |
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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