甲酸分离辐照稻草中纤维素、木质素和木糖的工艺

Fractionation processing of cellulose,lignin,and xylose from irradiated rice straw using formic acid

稻草经辐照预处理后,采用甲酸法分离纤维素、木质素和木糖组分,研究吸收剂量、反应温度和反应时间对分离效果的影响,并对分离后的组分进行组成分析和红外光谱表征。研究结果表明:辐照处理后的稻草纤维素和木聚糖降解产生水溶性低聚糖;经400 kGy剂量辐照处理的稻草采用质量分数88%的甲酸在100℃反应3 h后,木质纤维素组分获得最佳分离效果,其中纤维素、木质素和木糖的提取率分别为83.22%、46.18%和89.52%,纤维素和木质素的纯度分别为61.26%和86.19%,木糖组分中木糖和阿拉伯糖浓度分别为7.04 g/L和0.77 g/L。傅里叶变换红外光谱分析表明甲酸分离的稻草纤维素和木质素均产生了甲酰化修饰。

The cellulose,lignin,and xylose in irradiated rice straw were fractionated by formic acid method,and the effects of absorbed dose,reaction temperature,and reaction time on fractionation efficiency were studied.The separated components were analyzed and characterized by Fourier transform infrared(FTIR)spectroscopy.The results showed that the cellulose and xylan were degraded into water-soluble oligosaccharides after irradiation.Rice straw irradiated with 400 kGy was treated with 88%formic acid at 100℃for 3 h,the lignocellulose components obtained the best separation effect:the extraction rates of cellulose,lignin,and xylose were 83.22%,46.18%,and 89.52%,respectively;the purities of cellulose and lignin were 61.26%and 86.19%,respectively;the concentrations of xylose and arabinose in the rice straw xylose component were 7.04 g/L and 0.77 g/L,respectively.FTIR spectroscopy showed that both cellulose and lignin fractionated from rice straw by formic acid were formylated.