发明名称 |
METHOD FOR BLEACHING PAPER PULP |
摘要 |
The invention concerns a method for bleaching different types of paper pulp in two steps at atmospheric pressure and at a temperature not higher than 100 DEG C. The first step consists in contacting the unbleached paste with a mixture of paracetic acid and performic acid. The second step consists in treating the bleached pulp derived from the first step, with a solution of soda and hydrogen peroxide. The resulting pulps exhibit a high index of whiteness and a degree of polymerisation close to unbleached pulps. The method is environmentally safe and non-polluting.
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申请公布号 |
WO0222945(A1) |
申请公布日期 |
2002.03.21 |
申请号 |
WO2001FR02867 |
申请日期 |
2001.09.14 |
申请人 |
DELMAS, MICHEL;AVIGNON, GERARD |
发明人 |
DELMAS, MICHEL;AVIGNON, GERARD |
分类号 |
D21C9/10;D21C9/16;(IPC1-7):D21C9/10 |
主分类号 |
D21C9/10 |
代理机构 |
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代理人 |
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地址 |
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