Changes in the structural composition of hardwood kraft pulp during bleaching |
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| Authors: | G P Aleksandrova S A Medvedeva A P Sinitsyn O N Okunev |
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| Institution: | (1) Institute of Organic Chemistry, Siberian Division, Russian Academy of Sciences, ul. Favorskogo 1, 664033 Irkutsk, Russia;(2) Moscow State University, Vorob’evy gory, 119899 Moscow, Russia;(3) Skrjabin Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, pr. Nauki 5, 142292 Pushchino, Moscow oblast, Russia |
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| Abstract: | The possibility of using xylanase preparations for hydrolyzing hemicelluloses in a non-bleached kraft pulp in order to facilitate
its bleaching was studied. The effects of enzymatic preparations of fungal and bacterial origins were examined, and the optimal
conditions for xylanase activity were determined. UV spectroscopy demonstrated that the treatment of kraft pulp with enzymatic
preparations containing xylanase facilitated the subsequent removal of lignin and increased the brightness by 5%. The effect
of enzymatic treatment was retained in the case of peroxide bleaching. The enzymatic preparations studied are promising for
the development of chlorine-free pulp bleaching technologies. |
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