Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 64, Issue 44, Pages 8379-8387Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.6b03807
Keywords
lignin; depolymerization; lithium bromide; inorganic molten salt hydrate; aryl ether bond
Funding
- China Scholarship Council (CSC)
- NSF [CBET 1159561, CBET 1236562]
- USDA McIntire Stennis [WIS01597]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1236562] Funding Source: National Science Foundation
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The present study demonstrates that the concentrated lithium bromide (LiBr) solution with acid as catalyst was able to selectively cleave the beta-O-4 aryl ether bond and lead to lignin depolymerization under mild conditions (e.g., in 60% LiBr with 0.3 M HCl at 110 degrees C for 2 h). Four industrial lignins from different pulping and biorefining processes, including softwood kraft lignin (SKL), hardwood kraft lignin (HKL), softwood ethanol organosolv lignin (EOL), and acid corncob lignin (ACL), were treated in the LiBr solution. The molecular weight, functional group, and interunit linkages of the lignins were characterized using GPC, FTIR, and NMR. The results indicated that the beta-O-4 aryl ether bonds of the lignins were selectively cleaved, and both LiBr and HCl played crucial roles in catalyzing the cleavage of the ether bonds.
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