The Protection of C−O Bond of Pine Lignin in Different Organic Solvent Systems,ChemistrySelect

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The Protection of C−O Bond of Pine Lignin in Different Organic Solvent Systems
ChemistrySelect ( IF 1.9 ) Pub Date : 2020-04-01 , DOI: 10.1002/slct.201904884
Dongling Wang _{1,

2,

3,

4} , Wenjin Wang _{1,

2,

3,

4} , Wei Lv _{1,

2,

3} , Ying Xu _{1,

2,

3} , Jianguo Liu _{1,

2,

3} , Haiyong Wang _{1,

2,

3} , Chenguang Wang _{1,

2,

3} , Longlong Ma _{1,

2,

3}

Affiliation

The methods of extraction and degradation of lignin from biomass are very important for obtaining high value‐added chemical precursors. In this paper, pine wood powder was selected as the feedstock to investigate the effect of different organic solvent systems (ethanol, ethylene glycol, 1, 4‐butanediol and acetone) on the lignin extraction using different radio of H₂SO₄ and acetic acid. The extraction yields were calculated, the solvent lignin structure was analyzed by SEM, Elemental Analyzer, GPC, FT‐IR, HSQC and the organosolv lignin was depolymerized over NaOH and Pd/C in ethanol. The results showed that the molecular weight of all lignin extracted from biomass by different organic solvents were lower than 2000 g mol⁻¹. Among the organic solvents, acetic acid and glycol could react with the γ and ɑ position of the β‐O‐4 bond in lignin, which protect the C−O bond during the extraction treatment. The analysis of depolymerization products suggested that the ethylene glycol had the best ability of retaining the structures of lignin and dissolution. About 17.74 wt. % aromatic compounds were obtained from the ethylene glycol lignin in 2 MPa H₂ at 240°C, which were mainly phenyl alcohol compounds. Ethylene glycol lignin could give more aromatic hydrocarbon compounds and phenols than the other two kinds of lignin. Ethylene glycol and 1,4‐butanediol was also found in the depolymerization product respectively. The protection of the C−O bond offers effective strategies for directional depolymerization design.

中文翻译：

松木素在不同有机溶剂体系中的C-O键保护

从生物质中提取和降解木质素的方法对于获得高附加值的化学前体非常重要。本文以松木粉为原料，研究了不同的有机溶剂体系（乙醇，乙二醇，1、4-丁二醇和丙酮）对H ₂ SO ₄和乙酸的不同辐射对木质素提取的影响。。计算提取率，通过SEM，元素分析仪，GPC，FT-IR，HSQC分析溶剂木质素结构，然后将有机溶剂木质素在NaOH和Pd / C中在乙醇中解聚。结果表明，不同有机溶剂从生物质中提取的所有木质素的分子量均低于2000 g mol ^-1。在有机溶剂中，乙酸和乙二醇可以与木质素中β-O-4键的γ和ɑ位反应，从而在萃取过程中保护C-O键。解聚产物的分析表明，乙二醇具有保持木质素结构和溶解的最佳能力。约17.74重量在240℃下在2MPa H ₂中由乙二醇木质素获得％芳族化合物，主要是苯醇化合物。乙二醇木质素比其他两种木质素能提供更多的芳烃化合物和酚。解聚产物中还分别发现了乙二醇和1,4-丁二醇。C-O键的保护为定向解聚设计提供了有效的策略。

更新日期：2020-04-01

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