Welcome to Chemistry and Industry of Forest Products,

Chemistry and Industry of Forest Products ›› 2020, Vol. 40 ›› Issue (4): 33-40.doi: 10.3969/j.issn.0253-2417.2020.04.005

Previous Articles     Next Articles

Effect of Hydrothermal Pre-hydrolysis Strength on Chemical Composition and Solvent Absorption Properties of Acacia Wood Chips

Qian YANG1,Mimi YUAN1,Xueru SHENG1,Meihong NIU1,Qingwei PING1,Haiqiang SHI1,2,*()   

  1. 1. School of Light Industry&Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China
    2. State Key Lab of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
  • Received:2019-12-24 Online:2020-08-28 Published:2020-08-21
  • Contact: Haiqiang SHI E-mail:shihq@dlpu.edu.cn

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

CLC Number: