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Chemistry and Industry of Forest Products ›› 2017, Vol. 37 ›› Issue (6): 81-88.doi: 10.3969/j.issn.0253-2417.2017.06.011

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Preparation of Methyl Glucoside and Phenols from Pressurized Liquefaction of Bamboo

SU Qiuli1, JIANG Jianchun1,2, FENG Junfeng1, LI Fanglin1, XU Junming1,2   

  1. 1. Institute of Chemical Industry of Forest Products, CAF;National Engineering Lab. for Biomass Chemical Utilization;Key and Open Lab. of Forest Chemical Engineering, SFA;Key Lab. of Biomass Energy and Materials, Jiangsu Province, Nanjing 210042, China;
    2. Jiangsu Qianglin Bio-energy and Bio-materials Co., Ltd., Liyang 213364, China
  • Received:2017-04-06 Online:2017-12-25 Published:2018-01-05

Abstract: Bamboo sawdust was used as the raw material for pressurized liquefaction to obtain methyl glucoside and four kinds of phenols at different temperatures. The products composition and structure were analyzed by various methods. In addition, the variation of structure of lignocellulosic biomass in liquefaction process and the formation mechanism of liquefied products were investigated. The results showed that when liquefaction conditions were 40 g bamboo sawdust, m(bamboo):m(CH3OH)=1:12, the dosage of sulfuric acid 1 g, reaction time 10 min, and reaction temperature 200℃, the yield of liquefied product was 87.83% with 48.17%methyl glucoside and 39.66% phenols. The components and contents of methyl glucoside and phenols were characterized by gas chromatography-mass spectrometer(GC-MS) and high performance liquid chromatography(HPLC) analysis. The results showed that the degradation temperatures of cellulose and hemicellulose were low and the high temperature was beneficial to the degradation of lignin. The liquefaction residue was characterized by X-ray diffraction(XRD) and Fourier transform infrared spectrum analysis(FT-IR). The results showed that the crystal index of cellulose in the residue of 120-200℃ degradation was 6.12%-40.33% higher than that in the raw material. The reason could be explained as that the decomposition of lignin and hemicellulose in the amorphous region was destroyed partly during 120-200℃, however, the structure of amorphous region and crystalline region was destroyed completely in the 220℃.

Key words: liquefaction mechanism, methyl glucoside, phenols, fiber structure, relative crystallinity index

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