发明名称 |
Method of delignifying sulphite pulp with oxygen and borohydride |
摘要 |
A single stage method delignification process for pulps, preferably sulphite pulps. The improvement to conventional oxygen delignification process comprises in situ addition of a reducing agent substantially non-reactive with oxygen. The end result is a pulp having enhanced strength properties and higher viscosity. Sodium borohydride is the preferred reducing agent, and MgO is the preferred alkali source. Similar results can be obtained with a two-stage oxygen delignification wherein the pulp is treated with the reducing agent in the first stage, and then washed and pressed conventionnally before proceeding with the oxygen delignification in a second stage.
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申请公布号 |
US6325892(B1) |
申请公布日期 |
2001.12.04 |
申请号 |
US19980158498 |
申请日期 |
1998.09.23 |
申请人 |
UNIVERSITY OF NEW BRUNSWICK |
发明人 |
NI YONGHAO;VAN HEININGEN ADRIAAN R. P.;KANG GUO JUN;SKOTHOS ANASTASIOS |
分类号 |
D21C3/06;D21C3/22;D21C3/26;(IPC1-7):D21C9/147 |
主分类号 |
D21C3/06 |
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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