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| Comparison of Stickies Removal Efficiency of Deinked Pulp Treated by Lipase and Esterase |
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| DOI：10.11980/j.issn.0254-508X.2012.07.002 |
| Key Words:recycled pulp stickies lipase enzyme esterase |
| Fund Project:国家自然科学基金资助项目（编号：31170549，30972324）。 |
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| Abstract:The recycled pulp was treated with one lipase and two kinds of esterases before flotation，the effect of lipase and esterase treatment on the stickies removal was investigated. Also the changes in structure and molecular weight of the tetrahydrofuran (THF) extractives from the pulps before and after enzyme treatment were determined. The results showed that, with the optimum dosage of enzyme a (lipase) and enzyme c (esterase), the stickies in deinked pulp were reduced by 46% and 59%. After the flotation process, the amount of residual ink particle in the pulp decreased 310 mg/kg and 385 mg/kg, and the brightness of the pulp increased 6.9% and 7.3%, respectively. The analysis of GPC and FT-IR showed that with treatment of enzymes a large number of ester bonds of THF extractives were degraded and the molecular weight of THF extractives decreased significantly. Besides, the enzyme treatment had no negative effect on the physical properties of the pulp. |
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