Solvent Fractionation of Technical Lignin Materials with Industrially Relevant Solvents

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Idamaria Romakkaniemi, J. Ahola, Johanna Panula-Perälä, Marja Mikola, Juuso Pyörälä, J. Tanskanen
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Abstract

Lignin fractionation aims at dividing the original lignin material into more uniform fractions that have the qualities desired for further processing of the material. Solvent fractionation is a versatile method that produces a soluble and an insoluble fraction with varying compositions, including molecular weight distribution, polydispersity (PDI), and phenolic hydroxyl (OHph) content. These properties are key factors in the further downstream applicability of lignin. Kraft, organosolv, and hydrolysis lignins were fractionated using multiple solvents and their water solutions with a single-stage fractionation protocol. The produced fractions were analyzed for their molecular size distribution and OHph content. Soluble fractions were discovered with desirable qualities, including a narrow size distribution (lowest PDI 1.4) and accumulation of OHph groups (up to 3.05 mmolOH/glignin). Three fractionation solvents, i.e., pure isopropanol, pure ethanol, and 30% γ-valerolactone, were found to produce solvent-specific soluble fractions that had relatively identical characteristic Mw, Mn, and PDI values regardless of the initial lignin material. This is crucially important new data that is beneficial for robust lignin applicability at industrial scale. Other important observations were made regarding water-alcohol solutions, as the increase in initial solid content resulted in changes in the composition of the fractions produced. Further applicability of the obtained fractions is examined in this paper. Patterns as well as differences between the three lignin materials were observed in their dissolution and the resulting compositions of the soluble fractions. This wide comparable dataset of industrially relevant solvents and lignin materials provides significant insight into the possibilities of lignin downstream processing.
用工业相关溶剂对工业木质素材料进行溶剂分馏
木质素分馏的目的是将原始木质素材料分成更均匀的馏分,这些馏分具有进一步加工材料所需的品质。溶剂分馏是一种多功能方法,可产生成分各异的可溶部分和不溶部分,包括分子量分布、多分散性 (PDI) 和酚羟基 (OHph) 含量。这些特性是木质素进一步下游应用的关键因素。采用单级分馏方案,使用多种溶剂及其水溶液对牛皮纸木质素、有机溶剂木质素和水解木质素进行分馏。对产生的馏分进行了分子大小分布和 OHph 含量分析。发现的可溶性馏分具有理想的品质,包括狭窄的尺寸分布(最低 PDI 1.4)和 OHph 基团的积累(高达 3.05 mmolOH/木质素)。三种分馏溶剂(即纯异丙醇、纯乙醇和 30% γ-戊内酯)可产生溶剂特异性可溶性馏分,这些馏分具有相对相同的特征 Mw、Mn 和 PDI 值,与初始木质素材料无关。这是非常重要的新数据,有利于木质素在工业规模上的稳健应用。对水醇溶液还进行了其他重要观察,因为初始固体含量的增加会导致产生的馏分成分发生变化。本文对所获馏分的进一步适用性进行了研究。在三种木质素材料的溶解和由此产生的可溶性馏分成分方面,观察到了它们之间的模式和差异。这一具有广泛可比性的工业相关溶剂和木质素材料数据集为木质素下游加工的可能性提供了重要的启示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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