发明名称 |
METHOD OF BLEACHING A PULP |
摘要 |
<p>Methods for bleaching oxygen delignified and washed pumps having a consistency of between 8 and 20% are disclosed including a first chlorine dioxide bleaching step, washing the bleached pulp, subjecting the washed pulp to an alkaline extraction step to obtain an alkali-containing pulp, adding chlorine dioxide and adjusting the pH in a second chlorine dioxide bleaching step performed directly after the alkaline extraction step without an intermediate washing step, and subjecting the bleached alkali-containing pulp to a peroxide treatment step directly after the second chlorine dioxide bleaching step or with an intermediate washing step prior to the peroxide treatment step.</p> |
申请公布号 |
EP2247782(B1) |
申请公布日期 |
2014.07.02 |
申请号 |
EP20090715038 |
申请日期 |
2009.02.12 |
申请人 |
VALMET TECHNOLOGIES, INC. |
发明人 |
DAHL, MÅRTEN;ERIKSSON, SARA;NORDÉN, SOLVEIG |
分类号 |
D21C9/14;D21C9/10;D21C9/147;D21C9/16 |
主分类号 |
D21C9/14 |
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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