发明名称 |
VERFAHREN ZUR ENTFÄRBUNG VON ALTPAPIER DURCH FLOTATIONS-DEINKEN |
摘要 |
<p>Continuous flotation deinking of waste paper under alkaline conditions may not satisfactorily remove hydrophilic and water-soluble printing inks. The invention solves that problem by a two-stage flotation method. An alkaline flotation step is immediately followed by a flotation step in the neutral to weakly acid pH range, the pH value being lowered at the beginning of the second flotation step to a pH value in the range of from 5 to 7.5 using carbon dioxide.</p> |
申请公布号 |
DE60318480(T2) |
申请公布日期 |
2008.12.11 |
申请号 |
DE2003618480T |
申请日期 |
2003.11.04 |
申请人 |
EVONIK DEGUSSA GMBH |
发明人 |
SUESS, HANS ULRICH;GRIMMER, RALF |
分类号 |
D21C5/02 |
主分类号 |
D21C5/02 |
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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