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    Manganic ion delignification of lignocellulosic material
    5.
    发明授权
    Manganic ion delignification of lignocellulosic material 失效
    木质纤维素材料的锰离子脱木质素

    公开(公告)号：US4141786A

    公开(公告)日：1979-02-27

    申请号：US844553

    申请日：1977-10-25

    申请人： Robert C. Eckert

    发明人： Robert C. Eckert

    IPC分类号： D21C9/10

    CPC分类号： D21C9/1078

    摘要： A process for delignifying lignocellulosic pulps, which comprises the steps of (a) impregnating a lignocellulosic pulp slurry with a water-soluble manganous salt having a manganous ion concentration of from about 1% to about 10%, by weight of oven-dried pulp; (b) mixing the impregnated pulp slurry with an amount of alkali equal to the stoichiometric quantity of alkali required to precipitate the soluble manganous ion as insoluble manganous hydroxide; (c) aerating the pulp slurry with an oxygen-containing gas without further addition of alkali and in the absence of alkali for a period of time sufficient to oxidize substantially all of the manganous hydroxide to manganic hydroxide; (d) treating the pulp slurry with sufficient sulfuric acid to lower the slurry pH to at least about 3, thus releasing soluble manganic ions to oxidize the pulp lignins; (e) separating the effluent containing manganous ions from the pulp slurry with a non-alkaline wash; and then (f) extracting the oxidized lignins from the pulp slurry with an alkaline solution.

    摘要翻译： 一种木质纤维素纸浆脱木质素的方法，其包括以下步骤：（a）用具有约1％至约10％（重量）烘干纸浆的锰离子浓度的水溶性二价锰盐浸渍木质纤维素浆液; （b）将浸渍的纸浆浆料与等于作为不溶性氢氧化锰沉淀可溶性二价锰离子所需的碱的化学计量量相同的碱量混合; （c）用含氧气体充气纸浆，而不再进一步添加碱，并且在不存在碱的条件下，足以将基本上所有的氢氧化锰氧化成氢氧化锰的时间; （d）用足够的硫酸处理纸浆，将浆料pH降至至少约3，从而释放可溶性的三价锰离子以氧化纸浆木质素; （e）用非碱性洗涤剂从纸浆中分离出含有二价锰离子的流出物; 然后（f）用碱性溶液从纸浆中提取氧化的木质素。