Effect of structural characteristics on the depolymerization of lignin into phenolic monomers
| Autor: | Lisha Zhao, Chen Cheng, Xinping Ouyang, Xueqing Qiu, Dongxue Jin, Furong Wang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
020209 energy
General Chemical Engineering Potentiometric titration Ultrafiltration Energy Engineering and Power Technology macromolecular substances 02 engineering and technology complex mixtures 01 natural sciences Gel permeation chromatography Boric acid chemistry.chemical_compound 0202 electrical engineering electronic engineering information engineering Organic chemistry Lignin Alkyl chemistry.chemical_classification 010405 organic chemistry Depolymerization fungi Organic Chemistry technology industry and agriculture food and beverages 0104 chemical sciences Fuel Technology Monomer chemistry |
| Zdroj: | Fuel. 223:366-372 |
| ISSN: | 0016-2361 |
| DOI: | 10.1016/j.fuel.2018.03.041 |
| Popis: | The structure of lignin is one of the key factors affecting its depolymerization into phenolic monomers. Four lignin fractions with different molecular weight were obtained by using ultrafiltration membrane technology, and the characteristics of lignin factions with different molecular weight were determined by gel permeation chromatography (GPC), potentiometric titration, FT-IR and NMR. It is found that wheat alkali lignin with low molecular weight contained more content of phenolic hydroxyl, methoxyl function groups, and β-O-4 linkages, which was relatively prone to depolymerize into phenolic monomers with a higher yield, although the more content of carbonyl was reported to facilitate the depolymerization of lignin. With the increase of molecular weight of lignin, the depolymerization was more difficult, and the YMC decreased. Lignin fraction with low molecular weight was favorable for depolymerization into syringyl and alkyl syringyl, while the high molecular weight lignin was prone to depolymerize into guaiacyl and alkyl guaiacyl products. Boric acid was proved effective to avoid repolymerization and improve the YMC, and the dosage of boric acid was determined by the content of hydroxyl groups in lignin. |
| Databáze: | OpenAIRE |
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