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Electrochemical Degradation of Industrial Softwood Kraft Lignin
  
DOI:10.11980/j.issn.0254-508X.2019.06.004
Key Words:softwood kraft lignin  electrochemical catalysis  oxidative degradation  small molecule product
Fund Project:国家自然科学基金(No.31570566.31500489,31600472);山东省自然科学基金(ZR2017LEM009,ZR2018BEM026);国家重点研发计划(No.2017YFB0308000)。
Author NameAffiliation
XU Dingding State Key Lab of Bio-based Materials and Green Papermaking /Key Lab of Pulp & Paper Science and Technology of Education Ministry of China Qilu University of Technology(Shandong Academy of Sciences) Ji’nan Shandong Province 250353 
WANG Shoujuan State Key Lab of Bio-based Materials and Green Papermaking /Key Lab of Pulp & Paper Science and Technology of Education Ministry of China Qilu University of Technology(Shandong Academy of Sciences) Ji’nan Shandong Province 250353 
KONG Fangong* State Key Lab of Bio-based Materials and Green Papermaking /Key Lab of Pulp & Paper Science and Technology of Education Ministry of China Qilu University of Technology(Shandong Academy of Sciences) Ji’nan Shandong Province 250353 
ZHAO Xin State Key Lab of Bio-based Materials and Green Papermaking /Key Lab of Pulp & Paper Science and Technology of Education Ministry of China Qilu University of Technology(Shandong Academy of Sciences) Ji’nan Shandong Province 250353 
HU Zihao State Key Lab of Bio-based Materials and Green Papermaking /Key Lab of Pulp & Paper Science and Technology of Education Ministry of China Qilu University of Technology(Shandong Academy of Sciences) Ji’nan Shandong Province 250353 
BI Shilin State Key Lab of Bio-based Materials and Green Papermaking /Key Lab of Pulp & Paper Science and Technology of Education Ministry of China Qilu University of Technology(Shandong Academy of Sciences) Ji’nan Shandong Province 250353 
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Abstract:In this study, softwood kraft lignin(KL) was degraded by electrochemical oxidation process under KOH homogeneous alkaline system, using Ti/RuO2-IrO2 and stainless steel as anode and cathode respectively. The degradation products were studied on different categories.The effects of KL concentration, current density, reaction temperature and reaction time on the yield of various products were investigated by orthogonal experiment. The optimum conditions for the electrochemical oxidation degradation of KL under this system were as follows: the concentration of the KL was 40 g/L, current density was 60 mA/cm2, reaction temperature was 80℃, and reaction time was 3 h. Under these conditions, the yields pre kg lignin of various small molecule products were 3.442 g of aromatic aldehyde products, 23.913 g of aromatic acid products, and 0.804 g of the benzene and phenolic products.
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