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    A process for concentrating a black liquor
    2.
    发明公开
    A process for concentrating a black liquor 失效
    Verfahren zur Einengung von Schwarzlauge。

    公开(公告)号：EP0194845A2

    公开(公告)日：1986-09-17

    申请号：EP86301711.7

    申请日：1986-03-10

    申请人： Research Association of Pulp and Paper Technology

    发明人： Yaguchi, Tokiya ,  Nagato, Shuichi ,  Tanae, Kazushige ,  Shimokura, Akira ,  Hasegawa, Keiji

    IPC分类号： D21C11/10 ,  B01D1/14

    CPC分类号： D21C11/10

    摘要： A process and an apparatus are disclosed for concentrating an alkaline waste liquor which is discharged from a step of alkaline cooking wood fiber in order to recover cooking chemicals, characterized in that C0 2 gas and/or gas containing CO 2 gas is added to said waste liquor as a viscosity lowering agent, as a boiling point lowering agent and/or as a solidification promoter before and/or during said concentration.

    摘要翻译： 公开了一种方法和装置，用于浓缩从碱性烹饪木纤维的步骤排出的碱性废液以回收烹饪用化学品，其特征在于将CO 2气体和/或含有CO 2气体的气体加入到所述废液中作为 粘度降低剂，作为沸点降低剂和/或在所述浓缩之前和/或期间作为固化促进剂。

    Process for recovering sodium hydroxide from alkaline pulp waste liquor
    5.
    发明公开
    Process for recovering sodium hydroxide from alkaline pulp waste liquor 失效
    从用于Pulpherstellung碱性废液中回收氢氧化钠的方法。

    公开(公告)号：EP0223438A1

    公开(公告)日：1987-05-27

    申请号：EP86308274.9

    申请日：1986-10-24

    申请人： Research Association of Pulp and Paper Technology

    发明人： Okano, Masao ,  Nakano, Tatuo ,  Nakura, Michihiro ,  Tsukamoto, Haruo ,  Hasegawa, Keiji ,  Tanae, Kazushige ,  Nagato, Shuichi ,  Yaguchi, Tokiya ,  Kikuoka, Kazuma ,  Tokunaga, Kikuo ,  Iwahashi, Kouji ,  Machida, Osamu ,  Ito, Hayami ,  Takeshita, Yukichi ,  Nagai, Chiaki ,  Ogawa, Katsuyoshi

    IPC分类号： D21C11/00

    CPC分类号： D21C11/0092 ,  Y02P40/44

    摘要： Sodium hydroxide is recovered from an alkaline waste liquor ("black liquor") containing substantially no sulfur compounds discharged from a process comprising soda cooking wood fibers, washing and optionally bleaching them, by a direct causticization process. This process comprises:

    (a) adding a gas comprising carbon dioxide to the black liquor as it is or after concentration to adjust the pH of the black liquor to 9.5 to 12.5 (determined at a black liquor solids concentration of 40% and 80°C),
    (b) concentrating the above described black liquor to a solids concentration of 50 to 95%,
    (c) adding the above described carbon dioxide-treated and concentrated black liquor, oxygen and iron oxide to a combustion furnace, subjecting the mixture to combustion and thus burning organic substances and converting inorganic soda components into sodium carbonate and sodium carbonate into sodium ferrite, and
    (d) hydrolyzing the thus resulting product to recover sodium hydroxide and recycling the recovered iron oxide to step (c).

    摘要翻译： 氢氧化钠是从在碱性废液（“黑液”）包含基本上包含苏打蒸煮木质纤维，洗涤和漂白OPTIONALLY它们，通过直接苛化过程从过程中排出无硫化合物中回收。 此方法包括：（a）将气体包含二氧化碳的黑液原样或浓缩后的黑液至9.5的pH值调节至12.5（确定性开采在40％的黑液固体浓度和80℃ ），（b）浓缩上述的黑液的50〜95％的固体浓度，（c）加入上述二氧化碳处理并浓缩黑液，氧和铁氧化物到燃烧炉中，使该混合物进行 燃烧烧灼从而有机物质和无机转换苏打部件成碳酸钠和碳酸钠成铁素体的钠，和（d）水解从而产生产物以回收氢氧化钠和循环回收的氧化铁在步骤（c）。 [R