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首页> 外文期刊>Polymers >Hydrogenolysis and Activation of Soda Lignin Using [BMIM]Cl as a Catalyst and Solvent
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Hydrogenolysis and Activation of Soda Lignin Using [BMIM]Cl as a Catalyst and Solvent

机译：[BMIM] Cl作为催化剂和溶剂对苏打木质素进行氢解和活化

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To improve the reactivity of the soda lignin, an acid ionic liquid 1-butyl-3-mthylimidazolium chloride ([BMIM]Cl) was used as the catalyst and solvent to degrade the soda lignin through hydrogenolysis. Structural elucidation of the lignin samples was conducted by using a combination of analytical methods including chemical analysis, ultraviolet spectrophotometry (UV spectrophotometry), Fourier transform infrared spectroscopy (FT-IR spectra), two-dimensional heteronuclear single quantum coherence nuclear magnetic resonance (2D-HSQC NMR) techniques, and gel permeation chromatography (GPC). The antioxidant activities of the lignin samples were evaluated using the diammonium 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS + ) radical scavenging and 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging methods. The degradation mechanism was proposed based on the characterization results. The optimal reaction condition was as follows: the concentration of [BMIM]Cl in the solution was 10 wt %, the hydrogen initial pressure was 3 MPa, and the solution was heated for 4 h at 90 °C. After the reaction, the total hydroxyl content of the soda lignin increased by 81.3%, while the phenolic hydroxyl content increased by 23.1%. At the same time, the weight-average molar mass of the soda lignin sample decreased from 8220 to 6450 g/mol with an improved antioxidant activity. In addition, approximately 56.7% of the β-O-4 linkages were degraded in the lreaction. The main effect of the acid ionic liquid [BMIM]C1 was related to the cleavage of β-O-4 linkages. This study has shown the potential of using the catalyzed soda lignin as a natural polymer antioxidant.
机译：为了提高苏打木质素的反应性，使用酸性离子液体1-丁基-3-甲基咪唑鎓氯化物（[BMIM] Cl）作为催化剂和溶剂，以通过氢解作用降解苏打木质素。木质素样品的结构解析是通过结合使用化学分析，紫外分光光度法（UV分光光度法），傅立叶变换红外光谱法（FT-IR光谱），二维异核单量子相干核磁共振（2D- HSQC NMR）技术和凝胶渗透色谱法（GPC）。使用2,2'-叠氮基双（3-乙基苯并噻唑啉-6-磺酸盐）（ABTS +）自由基清除剂和1,1-二苯基-2-吡啶并肼基（DPPH）自由基清除剂来评估木质素样品的抗氧化活性。方法。根据表征结果提出了降解机理。最佳反应条件如下：溶液中[BMIM] Cl的浓度为10 wt％，氢气初始压力为3 MPa，溶液在90°C加热4 h。反应后，苏打木质素的总羟基含量增加了81.3％，而酚羟基含量增加了23.1％。同时，苏打木质素样品的重均摩尔质量从8220降至6450 g / mol，抗氧化活性得到改善。另外，在反应中降解了约56.7％的β-O-4键。酸性离子液体[BMIM] C1的主要作用与β-O-4键的断裂有关。这项研究表明了使用催化苏打木质素作为天然高分子抗氧化剂的潜力。

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