منابع مشابه
Enzymes Improve Ecf Bleaching of Pulp
The delignification efficiency of different laccase enzymes was examined on the eucalyptus Kraft pulp. The laccase enzyme from Trametes versicolor showing the highest delignification efficiency was selected and used in the elemental chlorine-free bleaching sequence for improving the pulp bleachability. An appreciable reduction in chlorine dioxide consumption was also obtained. Further reduction...
متن کاملEffluent Loads From Different ECF Bleaching Sequences Used In Hardwood Kraft Pulp Bleaching
Effluent loads from different traditional and emerging ECF bleaching sequences were investigated. Oxygen delignified Eucalyptus camaldulensis and Acacia mangium kraft pulps having similar kappa number, ca 12.0 were used in this study. Different ECF bleaching sequences were compared with reference sequence, D0EopD1 in terms of effluent load, such as AOX, COD and TOC. Depending on the nature of s...
متن کاملEnzymatic Bleaching of Wood Pulp
The dark colour of kraft pulp after the wood chips have been heated at high temperature with NaOH solution is caused by lignin (a complex phenolic polymer) still attached to the cellulose fibres. Traditionally this pulp is treated with chlorine to bleach the pulp to make it suitable for paper making. Unfortunately this leads to the formation of some potentially toxic chlorophenolic compounds of...
متن کاملstudy of enzymatic prebleaching effect on optical properties of bagasse kraft pulp in ecf bleaching
the effect of commercial xylanase enzyme in prebleaching of bagasse kraft pulp was investigated. xylanase enzyme from trichoderma viride was added to pulp at various doses of 5, 10, 25 and 50 iu/g pulp for reaction time 2h and then the enzyme treated pulp was bleached in d1ed2 sequences (using dioxide chlorine 4, 6, 8, 10% + alkaline extraction + dioxide chlorine 2% as active chlorine). the res...
متن کاملPulp reaction to vital bleaching.
This study evaluated the histological changes in dental pulp after nightguard vital bleaching with 10% carbamide peroxide gel. Fifteen patients between 12 and 26 years of age with caries-free first premolars scheduled for orthodontic extraction were treated with 10% Opalescence (Ultradent Products, Inc). Tooth #5 had four days of bleaching, tooth #12 was treated for two weeks, tooth #21 was ble...
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ژورنال
عنوان ژورنال: Sen'i Gakkaishi
سال: 2004
ISSN: 0037-9875,1884-2259
DOI: 10.2115/fiber.60.p_445