An integrated fractionation process, UV-catalyzed hydrogen peroxide pretreatment (UHP) with subsequent alkali and acidic ethanol extraction, was developed to consecutively recover cellulose, hemicellulose, lignin and pretreated liquid fractions from sisal waste. These fractions serve as a viable source of high-value industrial chemicals. Delignification rate reached approximately 80 % under the UHP pretreatment with 0.1 mL/g H₂O₂ for 6 h. The pretreated sisal waste was further fractionated into four parts, cellulose (35.5 g/100 g sisal waste), xylan-rich hemicellulose (12.5 g/100 g sisal waste), acid-insoluble lignin (5.7 g/100 g sisal waste) and the liquid fraction (21.0 g/100 g sisal waste). The cellulose fraction was in high purity with increased crystalline index of 51.4 %, and the hemicellulose fraction was rich in xylan. The lignin fraction had the GSH-type structure with some ferulic acid residues bound mainly via β-O-4 linkages. The liquid fraction had a high content of phenolic compounds (16.26∼41.88 mg GAE/L) with strong antioxidant activities, 11.16∼18.48 μmol TE/L reducing power, 66.78∼82.84 μmol TE/L hydroxyl radical scavenging and 14.83∼46.67 μmol TE/L ABTS radical scavenging.

开发了一种集成的分馏工艺，即紫外线催化的过氧化氢预处理（UHP），随后进行碱和酸性乙醇萃取，以从剑麻废料中连续回收纤维素，半纤维素，木质素和预处理的液体馏分。这些馏分可作为高价值工业化学品的可行来源。在UHP预处理（0.1 mL / g H ₂ O _2）下，脱木素率达到约80％持续6小时。将预处理的剑麻废料进一步分为四部分：纤维素（35.5 g / 100 g剑麻废料），富含木聚糖的半纤维素（12.5 g / 100 g剑麻废料），酸不溶性木质素（5.7 g / 100 g剑麻废料）和液体部分（21.0克/ 100克剑麻废料）。纤维素级分纯度高，结晶指数提高51.4％，半纤维素级分富含木聚糖。木质素部分具有GSH型结构，其中一些阿魏酸残基主要通过β-O-4键结合。液体馏分中酚类化合物含量高（16.26〜41.88 mg GAE / L），具有很强的抗氧化活性，11.16〜18.48μmolTE / L还原力，66.78〜82.84μmolTE / L羟基自由基清除能力和14.83〜46.67μmolTE / L ABTS彻底清除。