Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 8, Issue 2, Pages 1023-1030Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b05820
Keywords
Lignin; Phenols; Hydrogenolysis; Catalyst-free; Supercritical; Mixed solvent; Depolymerization
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Funding
- MRSEC Program of the NSF [DMR 170256]
- UC Santa Barbara Academic Senate Committee on Faculty Grants
- Fundamental Research Funds for the Central Universities
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX17_0074]
- Scientific Research Foundation of Graduate School of Southeast University [YBJJ 1807]
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Lignin is the largest renewable source of aromatic chemical building blocks on the planet and has great potential for the production of value-added chemicals. Herein, we describe lignin hydrogenolysis/depolymerization of organosolv poplar lignin (OPL) in ethanol/isopropanol solvent in the absence of added catalysts. Different EtOH/i-PrOH ratios as well as various reaction conditions were evaluated. OPL depolymerization was more effective in the mixed media than in ethanol or isopropanol alone. Heating OPL at 270 degrees C for 4 h in 50:50 (v:v) EtOH/i-PrOH in a closed pressure vessel gave an overall oil yield of 70 wt %, of which about 48% consisted of the monomers (E)-4-propenyl syringol and isoeugenol. Notably, these catalyst-free reactions in ethanol/sopropanol media show monomer yields comparable to those reported for lignin depolymerization using precious catalysts and dihydrogen, which suggests unexpectedly favorable H-donor ability of this mixed alcohol medium.
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