水热预水解强度对相思木组分及溶剂吸收性能的影响

doi:10.3969/j.issn.0253-2417.2020.04.005

摘要/Abstract

摘要：

采用不同的预水解强度（P因子）对阔叶材相思木进行水热预水解处理，通过对预水解木片得率、组成成分、1% NaOH抽出物、苯醇抽出物、元素分析、吸水量、耗碱量及表面形貌的分析，探讨了预水解强度对抽出物组分含量及溶剂吸收性能的影响。研究结果显示：随着P因子的增大，预水解后木片得率、综纤维素、聚戊糖、木质素含量都呈下降趋势，而1% NaOH抽出物和苯醇抽出物的含量呈现先上升后下降的趋势。当P因子为0~800时，1% NaOH抽出物和苯醇抽出物分别从12.04%和1.74%增加到25.98%和12.11%；当P因子从800增加到1 000时，两者分别从25.98%和12.11%下降到23.19%和11.08%。1% NaOH抽出物中木质素由7.15%（P=0）逐渐增加到48.37%（P=1 000）；而苯醇抽出物中木质素由16.42%（P=0）增加到47.68%（P=800）。根据水浸渍和碱浸渍实验显示：在预水解前期（P因子为0~310）时，预水解木片的吸水量和耗碱量均呈现上升的趋势，预水解木片的吸收性能有所改善，当P因子为310时，吸水量和耗碱量较高，分别为1.542 3 g/g和80.71 mg/g。表面形貌分析显示：随着P因子的增大，预水解后木片的表面越来越疏松，孔隙越来越多。

关键词: 水热预水解, P因子, 抽提物, 相思木, 吸收性能

Abstract:

The hydrothermal pre-hydrolysis of broadleaf acacia woods was carried out by different pre-hydrolysis strength (P factor), and through the analysis of the yield, composition, 1% NaOH extractive, benzene-alcohol extractive, elemental analysis, water absorption, alkali consumption and surface morphology of pre-hydrolyzed wood chips, the influence of pre-hydrolysis strength on the content of the extract components and solvent absorption properties were discussed. The results showed that with the increase of the P factor, the yield of wood chips and the content of holocellulose, pentosan and lignin after pre-hydrolysis all showed a decreasing trend. However, the content of sodium hydroxide extractive and benzene-alcohol extractive first increased and then decreased. When P factor was 0-800, the content of 1%NaOH extractive and benzene-alcohol extractive increased from 12.04% and 1.74% to 25.98% and 12.11%, respectively; when P factor was increased from 800 to 1 000, the content decreased from 25.98% and 12.11% to 23.19% and 11.08%, respectively. The lignin content of 1% NaOH extractive increased from 7.15% (when P factor was 0) to 48.37% (when P factor was 1 000), while the lignin content of benzene-alcohol extractive increased from 16.42% (when P factor was 0) to 47.68% (when P factor was 800).According to the results of water immersion and alkali immersion experiments, as the P factor increased, at the early stage of pre-hydrolysis (P factor was 0-310), the water absorption and alkali consumption of pre-hydrolyzed wood chips both showed a increasing trend, and the absorption properties of pre-hydrolyzed wood chips improved, and then decreased.When P factor was 310, the water absorption and alkali consumption were higher, which were 1.542 3 g/g and 80.71 mg/g respectively. The surface morphology analysis results showed that with the increase of P factor, the surface of the wood chips after pre-hydrolysis became looser and more porous.

Key words: hydrothermal pre-hydrolysis, P factor, extractive, acacia wood, absorption properties

中图分类号:

TQ35
TS743

杨倩,袁咪咪,盛雪茹,牛梅红,平清伟,石海强. 水热预水解强度对相思木组分及溶剂吸收性能的影响[J]. 林产化学与工业, 2020, 40(4): 33-40.

Qian YANG,Mimi YUAN,Xueru SHENG,Meihong NIU,Qingwei PING,Haiqiang SHI. Effect of Hydrothermal Pre-hydrolysis Strength on Chemical Composition and Solvent Absorption Properties of Acacia Wood Chips[J]. Chemistry and Industry of Forest Products, 2020, 40(4): 33-40.

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