微波辅助提取油茶果壳木质素工艺优化

Process Optimization for Microwave-assisted Extraction of Lignin from Camellia oleifera Shell

采用微波碱液提取法对油茶果壳木质素进行提取分离,以探寻油茶果壳木质素最佳提取工艺。采用单因素试验和正交试验法研究碱浓度、料液比、微波射功率、微波时间对木质素提取效果的影响,并对所提取木质素进行红外和紫外光谱分析。确定最佳提取工艺条件为碱浓度0.7mol/L、料液比1:70(g/mL)、微波功率和时间分别为550W和60min,在此条件下油茶果壳木质素得率达到11.45%;紫外图谱和红外图谱显示该方法提取的木质素保持了木质素的原有结构。优化油茶果壳木质素的最佳提取工艺,对木质素的工业化生产以及油茶的综合开发利用具有重要意义。

Lignin was extracted from Camellia oleifera shell by alkaline water with the assistance of microwave.The effects of potassium hydroxide concentration,solid-to-liquid ratio,microwave power and treatment time on the yield of lignin were studied by single factor and orthogonal array design methods.Meanwhile,the lignin obtained was structurally analyzed by infrared and（IR）and UV spectroscopy.The optimum extraction conditions were as follows：alkaline concentration 0.7 mol/L, solid-to-liquid ratio 1：70,and microwave radiation power 550 W for an extraction duration of 60 min.Under such conditions,the yield of lignin was up to 11.45%.IR and UV spectral analyses showed that the lignin extracted by this method remained its original structure.In conclusion,the optimum microwave-assisted extraction technology for lignin from Camellia oleifera shell has been obtained,which has great significance for the comprehensive exploitation and industrial utilization of Camellia oleifera shell as a rich source of lignin.