Alkaline Oxidation of Pine Wood to Monophenols

ZHU Yu-ting, LIU Jing, L&#x000dc; Wei, REUBROYCHAROEN Prasert, WANG Chen-guang

doi:10.3969/j.issn.2095-560X.2018.06.004

Advances in New and Renewable Energy >

2018 , Vol. 6 >Issue 6: 482 - 489

DOI: https://doi.org/10.3969/j.issn.2095-560X.2018.06.004

Alkaline Oxidation of Pine Wood to Monophenols

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1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;
2. CAS Key Laboratory of Renewable Energy, Guangzhou 510640, China;
3. Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China;
4. Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand;
5. University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2018-05-05

Revised date: 2018-06-12

Online published: 2018-12-24

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Abstract

Preparation of monophenols from lignin is one of the most popular strategies for lignin valorization. Here, pine wood was efficiently converted into vanillin and other monophenols by alkaline oxidation of pine wood under mild conditions, and left carbohydrates as solid residue. NaOH concentration, oxygen pressure, and especially agitation speed had significant impacts on the conversion of lignin to monophenols and solid residue yield, Pine wood was almost dissolved in the alkali solution and low monophenols yield (15%) was obtained at high agitation speed of 1 100 r/min. Decreasing agitation speed increased the reservation of solid carbohydrates and monophenols yields. At an agitation speed of 50 r/min, a highest monphenols yield (25.8wt.%) was obtained at a low NaOH concentration of 7.5wt.%. In addition, the degradation of vanillin under alkaline aerobic conditions was investigated. It was found that vanillin decomposed to carboxylic acids from small molecules to higher molecular weight products. Therefore, over oxidation of vanillin is an important cause of reduction of monophenol yields during the alkaline oxidation.

Key words： alkaline oxidation; vanillin; over oxidation; lignin; monophenol

Cite this article

ZHU Yu-ting, LIU Jing, LÜ Wei, REUBROYCHAROEN Prasert, WANG Chen-guang . Alkaline Oxidation of Pine Wood to Monophenols[J]. Advances in New and Renewable Energy, 2018 , 6(6) : 482 -489 . DOI: 10.3969/j.issn.2095-560X.2018.06.004

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