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首页> 美国卫生研究院文献>Molecules >Tuning Lignin Characteristics by Fractionation: A Versatile Approach Based on Solvent Extraction and Membrane-Assisted Ultrafiltration
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Tuning Lignin Characteristics by Fractionation: A Versatile Approach Based on Solvent Extraction and Membrane-Assisted Ultrafiltration

机译：通过分馏调节木质素特性：基于溶剂萃取和膜辅助超滤的多功能方法

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Technical lignins, typically obtained from the biorefining of lignocellulosic raw materials, represent a highly abundant natural aromatic feedstock with high potential in a sustainable economy scenario, especially considering the huge primary production volumes and the inherently renewable nature of this resource. One of the main drawbacks in their full exploitation is their high variability and heterogeneity in terms of chemical composition and molecular weight distribution. Within this context, the availability of effective and robust fractionation processes represents a key requirement for the effective valorization of lignin. In the present work, a multistep fractionation of two different well known technical lignins obtained from two distinct delignification processes (soda vs. kraft pulping) was described. A comprehensive approach combining solvent extraction in organic or aqueous medium with membrane-assisted ultrafiltration was developed in order to maximize the process versatility. The obtained lignin fractions were thoroughly characterized in terms of their chemical, physical, thermal, and structural properties, highlighting the ability of the proposed approach to deliver consistent and reproducible fractions of well-controlled and predictable characteristics, irrespective of their biomass origin. The results of this study demonstrate the versatility and the reliability of this integrated multistep fractionation method, which can be easily adapted to different solvent media using the same ultrafiltration membrane set up, thereby enhancing the potential applicability of this approach in an industrial scale-up perspective for a large variety of starting raw lignins.
机译：通常从木质纤维素原料的生物精制中获得的工业木质素代表了高度丰富的天然芳族原料，在可持续经济情景中具有很高的潜力，尤其是考虑到该资源的巨大初级生产量和固有的可再生性质。它们的充分利用的主要缺点之一是它们在化学组成和分子量分布方面的高度可变性和异质性。在此背景下，有效而稳健的分馏方法的可用性代表了木质素有效增值的关键要求。在本工作中，描述了从两种不同的脱木质素工艺（苏打与牛皮纸制浆）获得的两种不同的众所周知的工业木质素的多步分级分离。为了最大限度地提高过程的多功能性，开发了一种综合方法，将有机或水性介质中的溶剂萃取与膜辅助超滤相结合。对获得的木质素级分进行了化学，物理，热和结构性质的全面表征，从而突出了所提出的方法能够提供一致且可重现的，具有良好控制和可预测特性的级分的能力，无论其生物质来源如何。这项研究的结果证明了这种集成的多步分馏方法的多功能性和可靠性，该方法可以使用相同的超滤膜设置轻松地适应不同的溶剂介质，从而在工业放大的角度上增强了该方法的潜在适用性。用于各种起始原料木质素。

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