中空纤维管式超滤分离麦草碱提取液水溶性木质素-碳水化合物复合体

Isolation of Water-soluble Lignin-carbohydrate Complexes in Alkali Extractive of Wheat Straw by Hollow Fiber Ultrafiltration

用溶剂抽提法分离出含钠盐及低相对分子质量(Mr)物质的麦草常温碱提取水溶性木质素-碳水化合物复合体(LCC)级分,采用中空纤维管式超滤技术定量去除LCC中钠盐及低Mr(<1000)物质等杂质。研究结果表明,在超滤压力为0.10MPa、超滤浓度为0.5%(以质量分数计)的条件下,水溶性LCC经10次循环超滤后,其中钠盐及低Mr物质得到了有效去除,分离得到高得率、高纯度、富含碳水化合物的水溶性LCC级分。

The fraction of water-soluble lignin-carbohydrate complexes （LCC） containing sodium salt and low molecular weight （Mr ） substances （ 〈 1 000） was isolated from alkali extracting liquor of wheat straw by a solvent-extraction method. A hollow- fiber ultrafiltrator was used to isolate sodium salt and low Mr substances in the LCC. The results indicate that sodium salts and low Mr substances can be removed effectively after a total of ten times ultrafiltration loops with pressure 0.10 MPa and concentra- tion 0.5 % were performed. The LCC fraction, which consists of 95.5 % carbohydrate and 1.5 % lignin, was obtained with high yield and purity.