发明名称 |
A PROCESS IN A (D) STAGE BLEACHING OF SOFTWOOD PULPS IN A PRESENCE OF MG(OH)2 |
摘要 |
This invention relates to an improved bleaching process for bleaching pulp comprising at least one bleaching stage which comprises treating a softwood pulp with a bleaching agent comprising CIO2 in the presence of a weak base such as, for example, Mg(OH)<SUB>2</SUB> preferably at pH from about 3.5 to about 6.5. The invention is also relates a bleaching process for bleaching pulp having two or more bleaching stages, at least one of which and preferably two of which comprises treating a pulp with a bleaching agent comprising CIO2 in the presence of a weak base such as, for example, Mg(OH)<SUB>2</SUB> preferably at pH from about 3.5 to about 4.5. |
申请公布号 |
WO2008076267(A3) |
申请公布日期 |
2008.08.14 |
申请号 |
WO2007US25373 |
申请日期 |
2007.12.12 |
申请人 |
INTERNATIONAL PAPER COMPANY;YIN, CAIFANG;WITHERSPOON, KENT |
发明人 |
YIN, CAIFANG;WITHERSPOON, KENT |
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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