Journal
APPLIED ENERGY
Volume 158, Issue -, Pages 233-242Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2015.08.085
Keywords
Eucommia ulmoides Oliver; Steam explosion pretreatment; Alkaline hydrogen peroxide post-treatment; Lignin; Enzyme hydrolysis
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Funding
- Natural Science Foundation of China [31430092, 31110103902]
- State Forestry Administration of China [948-2012414, 948-2015459]
- International Cooperative Projects between China and Japan [K332021321]
- Yulin Science and Technology Plan Projects [2014cxy-03]
- China Youth Science and Technology Innovation Award Projects [10900-A189021502]
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Eucommia ulmoides Oliver (EU) wood was successively treated by a combined system based on steam explosion pretreatment (SEP) and alkaline hydrogen peroxide post-treatment (AHPP). In this case, SEP was to disrupt the lignocellulosic structure, and the subsequent AHPP process was to isolate the high-purity lignin and cellulose-rich substrates. Results showed that the lignin fractions obtained during the AHPP exhibited smaller molecular weights, narrow polydispersity, less phenolic OH groups and lower syringyl/guaiacyl ratios (S/G) than those of the milled wood lignin (SEMWL) obtained from the only steam exploded EU. NMR characterization of lignin revealed that the AHPP process has a slight effect on the composition and molecular characteristic of lignin, and the lignin isolated had lower amounts of substructures (aryl-beta-ether, resinol, and phenylcoumaran linkages) as compared to those in SEMWL. Moreover, the subsequent SEP followed by AHPP process enhanced the enzymatic hydrolysis of cellulose-rich substrates to a maximum value of 91.69%. It was found that the synergistic treatment removed most of lignin, degraded hemicelluloses, and incurred a higher crystalline index and surface area of the cellulose-rich substrates as compared to the only steam explosion pretreatment. The combination of the SEP and AHPP processes is an environmentally benign and advantageous scheme for the production of high-purity lignin and cellulose-rich substrates, which will be further transformed into the value-added biomaterials and bioethanol. (C) 2015 Elsevier Ltd. All rights reserved.
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