【作者】 张素风； 杨恒；

【Author】 ZHANG Sufeng,YANG Heng (College of Light Industry and Energy,Shaanxi University of Science and Technology,Xi’an,710021,Shaanxi,China)

【机构】 陕西科技大学轻工与能源学院；

【摘要】 对制浆前麦草热水抽提过程中的抽提液性能进行了实验和分析。实验结果表明:随着抽提温度升高、抽提时间延长,麦草得率下降;抽提液pH值降低,固形物含量和酸溶木素含量都有所升高。采用傅里叶红外光谱(FT-IR)和热重分析(TGA),对抽提液性能进行了表征。红外光谱分析表明1041cm-1处存在半纤维素的特征吸收峰;热重分析过程中,抽提液主要失重温度在150～450℃之间,259.5℃时失重速率最大,为0.295%/℃。更多还原

【Abstract】 The process of hot-water extraction before pulping was investigated in this paper. The results indicated that as the extraction temperature and time increase, the yield of wheat straw decreases, the pH value of the extracted solution decreased, with the increase of solids content and acid soluble lignin content. After extraction, the physical and chemical properties of hot-water extract were characterized by the Fourier Transform Infrared Spectrometer (FT-IR) and Thermo Gravimetric Analysis (TGA). The FT-IR shows that there is the characteristic absorption peak of hemicellulose in 1041cm-1. The TGA show that the main weight loss temperature of the extracts is between 150℃ ~450℃ , and the maximum weight loss rate is 0.295%/℃ appeared at 259.5℃ .更多还原