发明名称 |
BLEACHING PROCESS OF CHEMICAL PULP |
摘要 |
<p>A process for the bleaching of chemical pulp, comprising a first chlorine dioxide treatment (D) of the initial bleaching and chelation (Q) to be carried out in connection therewith, forming together a DQ treatment. The process is characterized in that the chelation is carried out at the pH of from 2 to 7, and it is followed by an alkalizing stage (N) of the pulp, without intermediate washing for raising the pH of the pulp to above 7 and at most to 12 prior to a following stage which is a washing step.</p> |
申请公布号 |
EP2029809(A1) |
申请公布日期 |
2009.03.04 |
申请号 |
EP20070730654 |
申请日期 |
2007.03.27 |
申请人 |
OY LAENNEN TUTKIMUS - WESTERN RESEARCH INC |
发明人 |
VILPPONEN, AKI;TIKKA, PANU |
分类号 |
D21C9/14 |
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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