预浸渍溶出物对巨尾桉机械浆漂白性能的影响

Effects of Pre-impregnation Soluble Substrates on the Bleaching Performance of Eucalyptus urophylla×E. grandis Mechanical Pulp

中文关键词:  桉木机械浆  漂白  预浸渍  溶出物

Key Words:eucalyptus mechanical pulp  bleach  pre-impregnation  soluble substrates

中文摘要:

      以巨尾桉热磨机械浆为研究对象，研究了3种化学品用量下（氢氧化钠10 kg/t、氢氧化钠30 kg/t、氢氧化钠10 kg/t+过氧化氢30 kg/t），3种预浸渍溶出物保留工艺对后续浆料漂白性能的影响。利用元素分析及裂解气质联用，比较了3种预浸渍溶出物的化学结构。结果表明，预浸渍处理浆的漂白性能均比桉木单段漂浆料漂白性能有较大提升，不同化学品用量预浸渍处理产生的预浸渍溶出物，在不同保留程度下，会对后续浆料的漂白性能有不同程度的负面作用。浆料中氮元素的溶出程度与浆料后续漂白性能的提升具有一定关联性。

Abstract:

      To study the effects of pre-impregnation on the bleaching performance of the pulp， Eucalyptus urophyllax E. grandis mechanical pulp was pre-impregnated via three types of pre-impregnation soluble substrates retention processes at three chemical dosages （NaOH 10 kg/t， NaOH 30 kg/t， NaOH 10 kg/t+H₂O₂ 30 kg/t）. The chemical structure of the three pre-impregnation soluble substrates were compared by elemental analysis and pyrolysis-gas chromatography/mass spectrometry. The results showed that the bleaching performances of pre-impregnated pulps using three processes all had a greater improvement than that of eucalyptus single-stage bleaching pulp. Pre-impregnated soluble substrates produced by pre-impregnation treatment with different chemical dosages could have a negative effect on the bleaching properties of pulps to varying degrees with different retention levels. There was a correlation between the degree of nitrogen dissolution from the pulp and the subsequent improvement of bleaching performance of the pulp.