Method for non-chlorine bleaching of cellulose pulp with a totally
closed counter-current liquid circuit
    1.
    发明授权
    Method for non-chlorine bleaching of cellulose pulp with a totally closed counter-current liquid circuit 失效
    具有全封闭逆流液体回路的纤维素纸浆非氯漂白方法

    公开(公告)号:US6126782A

    公开(公告)日:2000-10-03

    申请号:US663047

    申请日:1996-07-08

    摘要: A method for the manufacture of non-chlorine bleached pulp, from alkaline digested cellulose pulp, wherein a suspension of the cellulose pulp is subjected to a series to oxygen gas delignification (O), treatment with complexers (Q) and bleaching with non chlorine-containing oxidative bleaching agents (O,P,Z). The various treatment stages interspersed with washing and/or reconcentration of the cellulose pulp in at least one stage, in conjunction with which a suspension liquid is conveyed essentially in strict counter-current, with the result that the pulp manufacturing process is essentially totally closed with regard to the liquid circuit. The pH value of the suspension liquid, in the absence of a reduction agent, after oxygen gas delignification and onwards into the cellulose pulp treatment chain as far as the bleaching operation with the oxidative bleaching agent, is caused to attain a maximum of 10, and in that the carbonate content of the suspension liquid is caused to be the same as, or to exceed a certain lowest value depending on its position in the cellulose pulp treatment chain.

    摘要翻译: PCT No.PCT / SE94 / 01204 Sec。 371日期:1996年7月8日 102(e)日期1996年7月8日PCT 1994年12月14日PCT PCT。 WO95 / 16818 PCT出版物 日期1995年6月22日从碱性消化的纤维素纸浆制造非氯漂白纸浆的方法,其中将纤维素纸浆的悬浮液与氧气脱木质素(O)进行串联处理,用络合物(Q)和 用不含氯的氧化漂白剂(O,P,Z)漂白。 各种处理阶段在至少一个阶段中散布着纤维素纸浆的洗涤和/或再浓缩,结合基本上以严格的逆流输送悬浮液,结果是纸浆制造过程基本上完全被封闭 关于液体回路。 使得在不存在还原剂的情况下,悬浮液的pH值在氧气脱木质化之后并且进入纤维素纸浆处理链,直到用氧化漂白剂的漂白操作达到最大值10,并且 由于悬浮液的碳酸盐含量与纤维素纸浆处理链中的位置相同或超过一定的最低值。