Method for brightening mechanical pulps
    1.
    发明公开
    Method for brightening mechanical pulps 有权
    Verfahren zum bleichen von mechanischen Pulpe

    公开(公告)号:EP1258559A1

    公开(公告)日:2002-11-20

    申请号:EP02253048.9

    申请日:2002-04-30

    IPC分类号: D21C9/10

    CPC分类号: D21C9/1026

    摘要: The present invention is directed to an improved method for brightening mechanical pulp under neutral or alkaline papermaking conditions. The improvement comprises the steps of: (a) separating neutral or alkaline pulp dilution water into a high-solids stream and a neutral or alkaline low-solids stream; and (b) reusing the neutral or alkaline low-solids stream for pulp dilution purposes prior to a bleaching process.

    摘要翻译: 本发明涉及一种在中性或碱性造纸条件下增亮机械纸浆的改进方法。 改进包括以下步骤:(a)将中性或碱性纸浆稀释水分离成高固体物流和中性或碱性低固体物流; 和(b)在漂白过程之前将中性或碱性低固体物流重新用于纸浆稀释目的。

    Method for brightening virgin mechanical pulp
    2.
    发明公开
    Method for brightening virgin mechanical pulp 有权
    维尔法罕zum Bleichen von mechanischer Pulpe

    公开(公告)号:EP1418269A1

    公开(公告)日:2004-05-12

    申请号:EP03255900.7

    申请日:2003-09-19

    IPC分类号: D21C9/10

    CPC分类号: D21C9/1089 D21C9/1042

    摘要: A method for brightening virgin mechanical pulp. The method comprises combining: (i) an aqueous solution comprising sodium borohydride and sodium hydroxide; and (ii) an aqueous solution comprising sodium bisulfite, in a chemical mixer and adding output of the chemical mixer to an aqueous slurry of virgin mechanical pulp. The ratio of (moles bisulfite - moles hydroxide)/moles borohydride is from 0 to 7.8.

    摘要翻译: 一种增亮原始机械纸浆的方法。 该方法包括:(i)包含硼氢化钠和氢氧化钠的水溶液; 和(ii)包含亚硫酸氢钠的水溶液,在化学混合器中,并将化学混合器的输出添加到原始机械纸浆的含水浆料中。 (摩尔亚硫酸氢盐 - 摩尔氢氧化物)/摩尔硼氢化钠的比例为0至7.8。