水增溶法对 kraft 木质素的深度分级。
Advanced Fractionation of Kraft Lignin by Aqueous Hydrotropic Solutions.
机构信息
Chemical and Biochemical Reactor Engineering and Safety (CREaS), Department of Chemical Engineering, KU Leuven, Celestijnenlaan 200f, P.O. Box 2424, 3001 Leuven, Belgium.
Klabin S.A., Paraná 84275-000, Brazil.
出版信息
Molecules. 2023 Jan 10;28(2):687. doi: 10.3390/molecules28020687.
Lignin is an underutilized high-potential biopolymer that has been extensively studied over the past few decades. However, lignin still has drawbacks when compared with well-known petroleum-based equivalents, and the production of tailored lignin fractions is highly in demand. In this work, a new method for the fractionation of Lignoboost Kraft Lignin (LKL) is proposed by using two different hydrotropes: sodium xylenesulfonate (SXS) and sodium cumenesulfonate (SCS). The different fractions are obtained by sequentially decreasing the hydrotropic concentration with the addition of water. Four and three different fractions were retrieved from the use of SXS and SCS, respectively. The LKL and respective fractions were analysed, and compared by GPC, FTIR-ATR, H-NMR, C-NMR, P NMR, 2D HSQC and SEM. The fractions showed different molecular weights, polydispersity, and amount of functional groups. Our water-based lignin fractionation platform can potentially be combined with different lignin extraction and processing technologies, with the advantage of hydrotrope recycling.
木质素是一种未充分利用的高潜力生物聚合物，在过去几十年中得到了广泛研究。然而，与知名的石油基等价物相比，木质素仍然存在一些缺点，因此定制木质素馏分的生产需求量很大。在这项工作中，提出了一种使用两种不同的增溶剂（对甲苯磺酸钠（SXS）和 4-叔丁基苯磺酸钠（SCS））对 Lignoboost Kraft 木质素（LKL）进行分级的新方法。通过依次降低增溶剂浓度并加入水来获得不同的馏分。分别使用 SXS 和 SCS 可得到 4 种和 3 种不同的馏分。对 LKL 和各自的馏分进行了分析，并通过 GPC、FTIR-ATR、H-NMR、C-NMR、P NMR、2D HSQC 和 SEM 进行了比较。这些馏分表现出不同的分子量、多分散性和官能团数量。我们的基于水的木质素分级平台可以与不同的木质素提取和加工技术相结合，具有增溶剂回收的优势。
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