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| Effect of Autohydrolysis Pretreatment on the Subsequent Alkali Impregnation of Fast-growing Poplar Wood Chips |
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| DOI：10.11980/j.issn.0254-508X.2017.11.001 |
| Key Words:fast-growing poplar autohydrolysis alkali impregnation physical properties |
| Fund Project:国家自然科学基金项目（31270630、31570574）。 |
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| Abstract:The basic physical properties of autohydrolyzed fast-growing poplar wood chips were investigated. The alkali impregnation efficiency and the impregnation performance in different directions of autohydrolyzed poplar wood chips in the subsequent alkali impregnation process were also explored. The results showed that, after autohydrolysis pretreatment, the basic densities of poplar sapwood and heartwood chips all decreased, their volume porosities and saturated moisture contents increased, while their skeletal densities almost kept constant. When autohydrolyzed poplar wood chips were carried out alkali impregnation the absorption amounts of NaOH solution and consumption of NaOH increased with increasing of autohydrolysis intensity. The alkali impregnation performances of the sapwood chips in the axial, radial and tangential directions were improved in varying degrees, and the improvement in the axial direction was much more obvious than that in the radial and tangential directions. All of these indicated that the autohydrolysis pretreatment for fast-growing poplar wood chips could enhance their impregnation efficiency in the subsequent alkali impregnation process． |
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