Citation: OUYANG Xin-ping, TAN You-dan, QIU Xue-qing. Oxidative degradation of lignin for producing monophenolic compounds[J]. Journal of Fuel Chemistry and Technology, ;2014, 42(6): 677-682. shu

Oxidative degradation of lignin for producing monophenolic compounds

1.
School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China

Corresponding author: QIU Xue-qing,
Received Date: 20 February 2014
Available Online: 9 May 2014
Fund Project: 国家重点基础研究发展规划(973计划,2012CB215302) (973计划,2012CB215302)广东省自然科学基金(9151064101000082)。 (9151064101000082)

Oxidative degradation of lignin for producing monophenolic compounds was carried out under microwave irradiation, with H₂O₂, CuO and Fe₂(SO₄)₃ as the oxidants. The results indicated that the yield of monophenolic compounds and degradation rate of lignin feed reach 11.86% and 90.88%, respectively, under the relatively benign conditions of 180 ℃. Oxidative degradation of lignin with H₂O₂ as a single oxidant gives a high degradation rate but a lower yield of monophenolic compounds, due to the aromatic ring opening reaction; however, Cu²⁺ present in the oxidant system is able to promote the cleavage of side chain and ether bond, whereas Fe³⁺ to enhance the oxidation ability of H₂O₂, which are then conducive to improving the yield of monophenolic compounds. A moderate increase of degradation temperature and reaction time are favorable for improving the yield of monophenolic compounds. Owing to the coexistence of lignin degradation and recondensation of degraded fragments, the prevention of degraded lignin from recondensation turns to be a key issue to achieve a high yield of monophenolic compounds.
- alkaline lignin,
- microwave irradiation,
- oxidative degradation,
- monophenolic compounds
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