超临界下有机酸对稻秆水解糖化的影响

采用间歇式反应器在超临界条件下，以有机酸（甲酸、乙酸和丙酸）为催化剂对稻秆进行水解糖化研究，重点考察反应温度、反应时间、固液比对还原糖产率的影响。实验表明：有机酸的加入有利于稻秆的水解糖化，稻秆水解速率和还原糖产量都有所提高，这种趋势在加入甲酸时最为明显；随着反应时间的延长，还原糖产量会逐渐减少；适当提高固液比有助于增加还原糖产量。稻秆超临界水解糖化的最佳条件：甲酸体积分数3％、固液比4：60（g／mL）、反应温度410℃、反应时间5min，在此条件下，还原糖产量最高，达6．65g／L。

Effects of organic acids on rice straw on supercritical hydrolysis

With the organic acids （formic acid, acetic acid, and propionic acid） as the catalyst, hydrolysis saccharifieation of rice straw in the batch reactor was investigated under the condition of the super- and sub- critical water. The reaction temperature, reaction time and solid-to-liquid ratio for reduction sugar yield were studied. Results showed that organic acid was helpful to the hydrolysis saccharifieation of straw. Re- ducing sugar yield could increase when adding organic acid. This trend was most evident when adding for- mic acid. With the extension of reaction time, reducing sugar yield could gradually decreased. In the ap- propriate range, reducing sugar production was much higher with the increasing of the solid-liquid ratio. The best conditions on straw hydrolysis saecharifieation in supercritieal water from the experiment were as follows： formic acid concentration 3%, solid-to-liquid ratio 4： 60, temperature 410 ℃, and the reaction time 5 rain. Under the conditions, the reducing sugar production reached the highest, 6. 65 g/L.