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为研究超声波对离子液体-盐酸溶液预处理木质纤维素的影响,本试验采用氯化-1-丁基-3-甲基咪唑和氯化-1-烯丙基-3-甲基咪唑的盐酸溶液在超声辅助下对稻秆于30~70℃下进行预处理,首先探讨了温度、酸度和处理时间对酶解产糖量的影响,接着在最佳条件下通过酶解糖化、成分分析、表面形貌、结晶度以及化学结构的变化对有无超声辅助下预处理的效果进行考察。结果表明温度、酸度以及处理时间对酶解产糖量具有显著影响,在超声波的辅助下,产糖量、纤维转化率以及脱木质素率分别提高20.13%~28.96%、31.69%~35.23%和18.06%~19.33%。扫描电镜、X-射线衍射以及傅里叶变换红外光谱分析表明超声波辅助离子液体-盐酸溶液预处理能够促进对稻秆表面形貌和化学结构的破坏,并降低纤维素的结晶度。
In order to study the effect of ultrasonic wave on the pretreatment of lignocellulose with ionic liquid-hydrochloric acid solution, we used 1-butyl-3-methylimidazolium chloride and 1-allyl-3-methylimidazolium chloride Under the condition of ultrasound-assisted pretreatment of rice straw at 30-70 ℃, the effects of temperature, acidity and treatment time on the amount of sugar produced by enzymolysis were studied. Then, under the optimal conditions, enzymatic saccharification, composition analysis, Surface morphology, crystallinity and chemical structure changes with or without ultrasound-assisted preconditioning were investigated. The results showed that the temperature, acidity and treatment time had significant effects on the yield of enzymolysis sugar. With the aid of ultrasonic wave, the yield of sugar, fiber conversion and delignification increased by 20.13% -28.96%, 31.69% -35.23% and 18.06% ~ 19.33%. Scanning electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopy showed that ultrasonic-assisted ionic liquid-hydrochloric acid pretreatment can promote the destruction of the surface morphology and chemical structure of rice straw and reduce the crystallinity of cellulose.