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Wheat Straw Components Separation by Hydrothermal Binary Catalytic Ethanol Method and Its Structure Analyses
Received:May 29, 2020  
DOI：10.11980/j.issn.0254-508X.2020.10.005
Key Words:hydrothermal binary catalytic ethanol method  structural research  component separation  hemicellulose  lignin
Fund Project:国家“十三五”重点研发计划项目（2017YFB0307901）；陕西省重点研发计划项目（2017ZDXM-SF-090）。
Author NameAffiliationPostcode
修慧娟 陕西科技大学轻工科学与工程学院，轻化工程国家级实验教学示范中心， 陕西省造纸技术及特种纸品开发重点实验室，陕西西安，710021 710021
李静宇 陕西科技大学轻工科学与工程学院，轻化工程国家级实验教学示范中心， 陕西省造纸技术及特种纸品开发重点实验室，陕西西安，710021 710021
李金宝 陕西科技大学轻工科学与工程学院，轻化工程国家级实验教学示范中心， 陕西省造纸技术及特种纸品开发重点实验室，陕西西安，710021 710021
冯盼 陕西科技大学轻工科学与工程学院，轻化工程国家级实验教学示范中心， 陕西省造纸技术及特种纸品开发重点实验室，陕西西安，710021 710021
黎金桂 陕西科技大学轻工科学与工程学院，轻化工程国家级实验教学示范中心， 陕西省造纸技术及特种纸品开发重点实验室，陕西西安，710021 710021
赵欣 陕西科技大学轻工科学与工程学院，轻化工程国家级实验教学示范中心， 陕西省造纸技术及特种纸品开发重点实验室，陕西西安，710021 710021
谢竺航 陕西科技大学轻工科学与工程学院，轻化工程国家级实验教学示范中心， 陕西省造纸技术及特种纸品开发重点实验室，陕西西安，710021 710021
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Abstract:The effect of hydrothermal binary catalytic ethanol method on the separation of three main components of wheat straw was studied. Then hemicellulose and lignin were separated and extracted by alcohol precipitation method and dilution precipitation method respectively. The structures of the separated substances were characterized by high performance anion chromatograph， Fourier transform infrared spectrometer and nuclear magnetic resonance spectrometer. The results showed that the method of hydrothermal binary catalytic ethanol separation was feasible， and the extraction effect was good. The extraction rates of hemicellulose， lignin and crude cellulose were 38.1%， 55.5% and 40.7%， respectively. The main chain of hemicellulosan was formed by D-xylopyranosyl with （1，4）-β-glycosidic bond. The branched chains were 4-O-methyl-α-D-pyranosyl， α-L-furanoarabinoyl and acetyl. The lignin isolated had a typical G-S-H structure， and the content of S-type lignin was more than that of G-type lignin.
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