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首页> 外文期刊>Journal of Wood Chemistry and Technology >Ions Chelated with EDTA as Catalysts
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Ions Chelated with EDTA as Catalysts

机译：EDTA螯合离子作为催化剂

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The acid hydrogen peroxide system has been evaluated in more detail in the presence of a coarse Norway spruce thermomechanical pulp (TMP). The effects of parameters on the reactions involved were determined, such as pH, retention time, pulp consistency, type of iron catalyst, and the amount of dissolved organic material. Residual hydrogen peroxide, chemical oxygen demand, dissolved iron, and total fiber charge were quantified and the hydroxyl radical activity was monitored. The results showed that a catalyst of free ferrous ions (Fe~(2+)) gave more reactions with the lignocellulosic material than ferric ions (Fe~(3+)) chelated with EDTA. Furthermore, there were somewhat more reactions with the TMP when there was less dissolved organic material in the liquid phase from the start. Hydroxyl radicals were detected in all cases, but the level differed depending on the conditions used. It is likely that the iron must bind with the TMP or be in close proximity for the hydroxyl radicals to react with the pulp.
机译：在挪威云杉粗机械浆（TMP）的存在下，对酸性过氧化氢系统进行了更详细的评估。确定了参数对涉及的反应的影响，例如pH，保留时间，纸浆稠度，铁催化剂的类型以及溶解的有机物质的量。定量残留的过氧化氢，化学需氧量，溶解的铁和总纤维电荷，并监测羟基自由基活性。结果表明，与用EDTA螯合的三价铁离子（Fe〜（3+））相比，游离亚铁离子（Fe〜（2+））与木质纤维素材料的反应更多。此外，当从一开始就在液相中溶解的有机物质较少时，与TMP的反应就会更多。在所有情况下均检测到羟基自由基，但其水平因使用的条件而异。铁很可能必须与TMP结合或非常接近，以使羟基自由基与纸浆反应。

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