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    Silica composition
    24.
    发明公开
    Silica composition 审中-公开
    Silikazusammensetzung

    公开(公告)号：EP2592185A1

    公开(公告)日：2013-05-15

    申请号：EP13154819.0

    申请日：2008-01-16

    申请人： BIM KEMI AB

    发明人： Wassenius, Helena ,  Wållberg, Peter ,  Hassler, Thord ,  Kittelsen, Tom

    IPC分类号： D21C9/08 ,  D21H17/68 ,  D21C3/22 ,  C01B33/24 ,  D21C5/02 ,  D21C9/147

    CPC分类号： D21H17/68 ,  D21C3/226 ,  D21C5/027 ,  D21C9/083 ,  D21C9/147 ,  D21C9/163 ,  D21H17/64 ,  D21H21/02 ,  D21H21/52 ,  Y02W30/648

    摘要： The invention relates to a composition comprising a mixture of a silica compound and an alkaline earth metal oxide or alkaline earth metal hydroxide in an aqueous solvent, characterised in that the silica compound and the alkaline earth metal oxide or alkaline earth metal hydroxide together form the major part of the non-solvent matter of the composition. The invention also relates to a method for producing said composition comprising adding an alkaline earth metal oxide or alkaline earth metal hydroxide and a silica compound to an aqueous medium to form an aqueous mixture, and allowing said aqueous mixture to stand. The invention also relates to a method for treating cellulosic fibres using said composition.

    摘要翻译： 本发明涉及在水性溶剂中包含二氧化硅化合物和碱土金属氧化物或碱土金属氢氧化物的混合物的组合物，其特征在于二氧化硅化合物和碱土金属氧化物或碱土金属氢氧化物一起形成主要 部分非溶剂物质的组成。 本发明还涉及一种生产所述组合物的方法，其包括向碱性介质中加入碱土金属氧化物或碱土金属氢氧化物和二氧化硅化合物以形成水性混合物，并使所述含水混合物静置。 本发明还涉及使用所述组合物处理纤维素纤维的方法。

    PROCESS FOR PREPARING A BUFFER SOLUTION IN A PAPERMAKING PROCESS
    26.
    发明公开
    PROCESS FOR PREPARING A BUFFER SOLUTION IN A PAPERMAKING PROCESS 有权
    一种用于生产缓冲来在造纸过程中

    公开(公告)号：EP2329078A1

    公开(公告)日：2011-06-08

    申请号：EP09782218.3

    申请日：2009-08-26

    申请人： Linde Aktiengesellschaft

    发明人： FÄLLDIN, Anders ,  EMÅS, Leif

    IPC分类号： D21H21/14 ,  D21H17/14 ,  D21H17/64 ,  D21H17/65 ,  D21H23/06 ,  D21H23/78 ,  D21H21/10 ,  D21H23/04 ,  D21H23/08 ,  D21H23/10

    CPC分类号： D21H17/34 ,  D21H17/64 ,  D21H17/65 ,  D21H21/14 ,  D21H23/04 ,  D21H23/06 ,  D21H23/10 ,  D21H23/78

    摘要： The invention describes a process for preparing a buffer solution in a papermaking process wherein the buffer solution is used for controlling the alkalinity, pH and/or hardness of a process stream, e.g. an aqueous pulp suspension, in the papermaking process. In one embodiment of the invention the basic substance, sodium hydroxide, 1 and water 2 is fed together in a mixer 3 to get a diluted sodium hydroxide containing aqueous solution. The acidic substance, carbon dioxide, 4 in the gaseous phase is introduced in the dissolver 5. In the dissolver 5 the gaseous carbon dioxide is dissolved in a re-circulated buffer solution 6. The aqueous solution containing diluted sodium hydroxide is fed to the dissolver 5 too. The re-circulated buffer solution 6, which is withdrawn from the reactor 7 and pumped by the pump 8 into the dissolver 5, is buffered by sodium bicarbonate, which is formed in the reactor 7. Thereby the pH of the re-circulated buffer solution is according to the invention below 7.5 at all the time when the basic or acidic substances where mixed together. The re-circulated flow of the buffer solution 6 prevent a local increase of the pH above 7.5 due to the introduction of the sodium hydroxide containing aqueous solution and thereby the precipitation of calcium carbonate. The pH is always below 7.5 when carbon dioxide is introduced. The sodium bicarbonate containing buffer solution is created in the reactor 7 where bicarbonate ions are formed. The resulting bicarbonate ions containing buffer solution 9 is supplied to the main process stream, the aqueous pulp suspension, for controlling the alkalinity, pH and/or hardness.