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| Changes of Chemical Composition and Structural Characteristics of Poplar Sapwood Chips After Autohydrolysis and Their Effects on the Subsequent Alkali Impregnation |
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| DOI：10.11981/j.issn.1000-6842.2018.01.15 |
| Key Words:poplar sapwood chip; autohydrolysis pretreatment; chemical composition; structural characteristic; alkali impregnation |
| Fund Project:国家自然科学基金项目（31270630）；国家自然科学基金项目（31570574）。 |
| Author Name | Affiliation | | 江骁雅1，2，3 | 1. 天津科技大学天津市制浆造纸重点实验室，天津，300457； 2. 中国制浆造纸研究有限公司，北京，100102；3. 制浆造纸国家工程实验室，北京，100102 | | 陈雪峰2，3 | 1. 天津科技大学天津市制浆造纸重点实验室，天津，300457； 2. 中国制浆造纸研究有限公司，北京，100102；3. 制浆造纸国家工程实验室，北京，100102 | | 侯庆喜1，* | 1. 天津科技大学天津市制浆造纸重点实验室，天津，300457； 2. 中国制浆造纸研究有限公司，北京，100102；3. 制浆造纸国家工程实验室，北京，100102 | | 岳 珍1 | 1. 天津科技大学天津市制浆造纸重点实验室，天津，300457； 2. 中国制浆造纸研究有限公司，北京，100102；3. 制浆造纸国家工程实验室，北京，100102 | | 张宏雷1 | 1. 天津科技大学天津市制浆造纸重点实验室，天津，300457； 2. 中国制浆造纸研究有限公司，北京，100102；3. 制浆造纸国家工程实验室，北京，100102 | | 刘 苇1 | 1. 天津科技大学天津市制浆造纸重点实验室，天津，300457； 2. 中国制浆造纸研究有限公司，北京，100102；3. 制浆造纸国家工程实验室，北京，100102 |
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| Abstract: |
| The chemical composition and structural characteristics of the fast-growing poplar sapwood chips after autohydrolysis pretreatment were investigated. The effects of the alkali concentration and temperature of the impregnation on alkali impregnation result of autohydrolyzed chips were analyzed. The results showed that the contents of holocelluloses, acetyl groups, and lignin of the poplar sapwood chips all decreased with increasing the intensity of autohydrolysis pretreatment, while the content of weak acidic groups first increased and then decreased. After autohydrolysis, the matrix and/or tyloses in the vessels could be cleaned up, and the pit membranes of some pits could also bedissolved and damaged. The alkali impregnation experiment of both poplar sapwood chips without and with autohydrolysis found that, the amounts of adsorption of NaOH solution and consumption of NaOH of the chips increased as the intensity increase of autohydrolysis.It indicated that autohydrolysis pretreatment could improve the alkali impregnation efficiency of poplar sapwood chips. The amounts of adsorption of NaOH solution and consumption of NaOH of the both chips without and with autohydrolysis all increased as the concentration of the NaOH solution and the impregnation temperature increased, they had good linear correlations. |
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