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Purification， Fractionation and Oxiammonolysis of Industrial Alkaline Lignin
  
DOI：10.11980/j.issn.0254-508X.2019.01.002
Key Words:alkaline lignin  purification  ethanol fractionation  oxiammonolysis  fertilizer
Fund Project:国家重点研发计划项目（2017YFB0307901）；国家自然科学基金项目（21576213）。
Author NameAffiliation
WANG Qianqian Tianjin Key Lab of Pulp and Paper， Tianjin University of Science & Technology， Tianjin， 300457 
HUI Lanfeng* Tianjin Key Lab of Pulp and Paper， Tianjin University of Science & Technology， Tianjin， 300457 
WU Yueru Tianjin Key Lab of Pulp and Paper， Tianjin University of Science & Technology， Tianjin， 300457 
HAN Xu Tianjin Key Lab of Pulp and Paper， Tianjin University of Science & Technology， Tianjin， 300457 
YANG Bing Tianjin Key Lab of Pulp and Paper， Tianjin University of Science & Technology， Tianjin， 300457 
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Abstract:The industrial alkaline lignin was purified by acid precipitation and classified into fractions of different molecular weights by fractional dissolution with ethanol， then it was carried out oxiammonolysis reaction with clean oxidants and ammonizators. FT-IR， the Kjeldahl and elemental analysis methods were used to characterize the structural changes of different fractions， structural changes after oxiammonolysis and nitrogen content of purified alkaline lignin， which were helped to research the effects of different factors on the oxiammonolysis. The results showed that the optimal reaction conditions were as followes, 10% alkaline lignin concentration， 30% ammonia charge， 20% hydrogen peroxide dosage， 45℃ reaction temperature， 1.5 h reaction time.The nitrogen content after the oxiammonolysis under the operating conditions increased significantly, and the ratio of carbon to nitrogen of the purified alkaline lignin decreased as the molecular weight decreased， which could be used as fertilizer．
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