Depolymerization of Organosolv Lignin to Valuable Chemicals over Homogeneous and Heterogeneous Acid Catalysts
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Publication Details
Author list: Wanmolee W., Daorattanachai P., Laosiripojana N.
Publisher: Elsevier
Publication year: 2016
Volume number: 100
Start page: 173
End page: 177
Number of pages: 5
ISSN: 1876-6102
eISSN: 1876-6102
Languages: English-Great Britain (EN-GB)
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Abstract
Study on lignin conversion to industrial-needed chemicals has been recently developing by using acid depolymerization process. In this work, depolymerization of organosolv lignin was investigated at 250ฐC for 1 h in methanol with and without presence of homogeneous and heterogeneous acid catalysts. In addition, the effect of reaction temperature (200, 250, 300, and 350ฐC) was studied for maximizing the total yields of phenolic compounds. Significant differences in terms of lignin conversion, liquid fraction (oil products), residual lignin (RL) fraction, and solid residue (char) were also observed. The results show that H-Y zeolite (SiO2/Al2O3 = 10) gave the highest lignin conversion (80.70%) and the yields of total aromatic monomers (1.02%) with the maximum product distribution of vanillin (0.40%). Under the conditions of 300ฐC for 1 h in the presence of H-Y zeolite (SiO2/Al2O3 = 10), maximum lignin conversion of 92.58% with total phenolic compound yield of 6.02% can be achieved. The individual monomeric phenols composed of 4-ethylguaiacol (1.37%), guaiacol (1.23%), 4-ethylphenol (1.23%), syringol (1.09%), phenol (0.68%), and vanillin (0.22%). These results suggest that catalytic depolymerization of organosolv lignin is a promising way for production of valuable chemicals. ฉ 2016 Published by Elsevier Ltd.
Keywords
acid-catalyzed depolymerization, lignin conversion
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