Aplication and the role of permanganate as a new bleaching agent

高锰酸盐作为新型漂白剂的应用及作用

• 批准号: 04806023
• 负责人: KOJIMA Yasuo
• 金额: $ 1.22万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04806023/
• 关键词: KP; Bleaching; Permanganate; リグニンモデル; セルロースモデル; KP漂白; 非塩素系漂白; リグニン; 酸化分解

Permanganate was examined as a new bleaching reagent for chemical pulp and some interesting results were obtained.Bleaching of hardwood KP and OKP with perman-ganate resulted in a greater reduction in K value. Viscosity were also decreased by permanganate bleaching with increasing the charge of permanganate. As employing neutral condition in permanganate bleaching, the drop in viscosity was improved, resulted in higher K value. Comparing at the same K value, neutral condition in permanganate bleaching gave the pulps with higher strength properties than acidic condition. KP gave higher quality pulps after permanganate bleaching than Okp. From this result, oxygen prebleaching stage found to be necessary for permanganate bleaching. In any case, permanganate bleaching gave the pulp with superiorproperties to pulp bleached with ozone.In neutral condition, bleached pulp with per-manganate required to treat with reductant in acidic medium. This post treatment was carried out sufficiently with oxalic acid which playd the role as a acid and a reductant.Brightness of permanganate bleached pulp wereeasily increased with ozone bleaching. The result indicates that not only elementary chlorine but chlorine compounds could be eliminated from bleaching sequence.

将锰酸盐用于化学纸浆的新型漂白试剂，并获得了一些有趣的结果。将硬木KP和OKP视为具有永久性的Hardwood KP和OKP，导致K值的降低更大。粘稠的粘液质漂白也会随着大麻烷酸的电荷增加而降低粘度。随着在锰酸盐漂白中采用中性条件，粘度下降得到改善，导致k值更高。在相同的K值进行比较时，大麻酸漂白中的中性条件比酸性条件具有更高的强度性能。高锰酸盐漂白后，KP给出了比OKP更高的纸浆。从此结果，发现降解氧气是锰酸盐漂白所必需的。在任何情况下，锰酸盐漂白使果肉具有优质的牙髓，可在中性条件下漂白，在酸性培养基中用还原剂治疗的中性果肉中，果肉的漂白果肉。这种后治疗用草酸充分地进行，该方法将其角色扮演酸和还原剂。浓汤漂白果肉的闪亮性随着臭氧漂白而增加。结果表明，不仅可以从漂白序列中消除基本氯，而且还可以消除氯化合物。