Institute of Bio- and Geosciences, Plant Sciences, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
Institute of Technical and Macromolecular Chemistry (ITMC), RWTH Aachen University, Worringer Weg 1, 52074 Aachen, Germany.
Molecules. 2020 Jul 22;25(15):3330. doi: 10.3390/molecules25153330.
Fractionation of lignocellulose into its three main components, lignin, hemicelluloses, and cellulose, is a common approach in modern biorefinery concepts. Whereas the valorization of hemicelluloses and cellulose sugars has been widely discussed in literature, lignin utilization is still challenging. Due to its high heterogeneity and complexity, as well as impurities from pulping, it is a challenging feedstock. However, being the most abundant source of renewable aromatics, it remains a promising resource. This work describes a fractionation procedure that aims at stepwise precipitating beech wood () lignin obtained with OrganoCat technology from a 2-methyltetrahydrofuran solution, using -hexane and -pentane as antisolvents. By consecutive antisolvent precipitation and filtration, lignin is fractionated and then characterized to elucidate the structure of the different fractions. This way, more defined and purified lignin fractions can be obtained. Narrowing down the complexity of lignin and separately valorizing the fractions might further increase the economic viability of biorefineries.
将木质纤维素分馏为其三个主要成分，木质素、半纤维素和纤维素，是现代生物精炼概念中的常见方法。虽然半纤维素和纤维素糖的利用在文献中已有广泛讨论，但木质素的利用仍然具有挑战性。由于其高度的异质性和复杂性，以及制浆过程中的杂质，它是一种具有挑战性的原料。然而，作为最丰富的可再生芳烃来源，它仍然是一种很有前途的资源。本工作描述了一种分馏程序，旨在使用 -己烷和 -戊烷作为反溶剂，逐步沉淀用 OrganoCat 技术从 2-甲基四氢呋喃溶液中获得的山毛榉木（）木质素。通过连续的反溶剂沉淀和过滤，对木质素进行分馏，然后对其进行表征，以阐明不同级分的结构。这样，可以获得更明确和更纯化的木质素级分。缩小木质素的复杂性并分别对级分进行增值，可能会进一步提高生物精炼厂的经济可行性。
