Organic solvent nanofiltration membranes were employed to fractionate birch derived reductive catalytic fractionated (RCF) lignin oil. This lignin oil is highly depolymerized, with most, if not all chemical compounds lighter than 3 kDa. Sixteen commercially available membranes were investigated for the fractionation, in combination with methanol and ethyl acetate as solvents. Membrane performances were quantified using Gaussian fits of gel permeation chromatograms and separation factor calculations. The separation factor was found to be primarily based on affinities instead of size-exclusion. The silicon-based membranes from Borsig (Germany) and PuraMem S600 from Evonik (UK) proved best at separating lignin into different functional fractions, showing monomer separation factors up to 7.4 and providing a permeate fraction with 88% phenolic monomer purity. These membranes were further examined in batch diafiltration and two-stage filtration. This increased the separation factor from 7.4 to 25.4, and the monomer purity of the permeate to 95%, proving that membrane purification of the lignin-derived monophenols is technically feasible.

有机溶剂纳滤膜用于分馏桦木衍生的还原催化分馏 (RCF) 木质素油。这种木质素油是高度解聚的，大多数（如果不是所有的话）化合物的重量都小于 3 kDa。结合甲醇和乙酸乙酯作为溶剂，研究了 16 种市售膜用于分馏。使用凝胶渗透色谱图的高斯拟合和分离因子计算来量化膜性能。发现分离因子主要基于亲和力而不是尺寸排除。Borsig（德国）的硅基膜和 Evonik（英国）的 PuraMem S600 被证明在将木质素分离成不同的功能部分方面表现最好，单体分离因子高达 7。4 并提供具有 88% 酚类单体纯度的渗透馏分。在分批渗滤和两级过滤中进一步检查了这些膜。这将分离因子从 7.4 提高到 25.4，渗透液的单体纯度提高到 95%，证明木质素衍生单酚的膜纯化在技术上是可行的。