| 摘要 |
PCT No. PCT/SE94/01204 Sec. 371 Date Jul. 8, 1996 Sec. 102(e) Date Jul. 8, 1996 PCT Filed Dec. 14, 1994 PCT Pub. No. WO95/16818 PCT Pub. Date Jun. 22, 1995A 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. |
