发明名称 |
Multi-stage bleaching process having a final stabilized peroxide stage |
摘要 |
Process for bleaching a chemical paper pulp to a brightness of at least 89 ISO, consisting in subjecting the pulp to a treatment sequence of several stages including a final bleaching stage with hydrogen peroxide in alkaline medium carried out in the presence of at least one stabilising agent and at a consistency of at least 25% by weight of solids, the stages preceding this final stage having purified the pulp so that its manganese content does not exceed 3 ppm by weight with respect to the solids and that the pulp has been delignified beforehand to a kappa number not exceeding 5
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申请公布号 |
US6221209(B1) |
申请公布日期 |
2001.04.24 |
申请号 |
US19930083183 |
申请日期 |
1993.06.29 |
申请人 |
SOLVAY INTEROX (SOCIéTé ANONYME) |
发明人 |
DESPREZ FRANCOIS;DEVENYNS JOHAN;TROUGHTON NICHOLAS;ESSEMAEKER PAUL |
分类号 |
D21C9/10;D21C9/16;(IPC1-7):D21C9/14;D21C9/147;D21C9/153 |
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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