【摘要】 建立了一种准确测定汽爆料三组分含量的方法。样品经过水洗除沙、烘干、粉碎、过筛等前处理过程,得粒度为40目样品,样品取样量为0.4 g。样品经浓硫酸、稀硫酸水解成单糖,利用高效液相色谱(HPLC)对样品进行测定。以浓硫酸浓度、稀硫酸酸解温度、稀硫酸酸解时间为考察因素设计正交实验。结果最佳测定条件为:浓硫酸质量分数为70%,稀硫酸酸解温度为121℃,稀硫酸酸解时间为1 h。该方法测得的玉米秸秆汽爆料纤维素、半纤维、木质素的质量分数分别为42.42%、2.52%和34.82%,RSDs(相对标准偏差)为0.06~0.23。更多还原

【Abstract】 A method is developed and applied to determine the content of steam-exploded components of lignocelluloses. 0. 4 g of Samples with particle size of 40 mesh can be obtaind by washing to wipe out sand,drying,crushing and sieving,which are then hydropyzed by concentrated sulphuric acid and dilute sulfuric acid succesively to generate monosaccharide. High Performance Liquid Chromatography( HPLC) is used to detemine the components of the samples. The effects of sulfuric acid concentration,hydrolysis temperature and reaction time of dilute sulfuric acid are studied through orthogonal experiment. The optimal conditions are shown as follows: 70% mas fraction of concentrated sulphuric acid,121℃ of hydrolysis temperature of dilute sulfuric acid and 1 hour of hydrolysis reaction time of dilute sulfuric acid. The contents of cellulose,hemicellulose and lignin of the pretreated samples which are made of corn stalks are 33. 90%,23. 89% and 15. 84%,respectively. The relative standard deviations( RSDs) are between 0. 06 and 0. 23.This method has the advantages of accuracy,reliability,simple operation,less time consuming and feasibility of batch testing,which can be widely used in production testing.更多还原