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微波条件下磷酸快速水解纤维素得到葡萄糖,而葡萄糖可替代甲醛制备新型环保PF(酚醛树脂)。以微波功率、反应时间和反应温度为试验因素,以葡萄糖产率为考核指标,采用正交试验法优选出磷酸水解纤维素的最佳工艺条件。结果表明:各因素对磷酸水解纤维素的影响依次为反应温度>反应时间>微波功率;当微波功率为240 W、反应温度为100℃和反应时间为40 s时,水解液中葡萄糖含量为80.7%,葡萄糖浓度为40.35 g/L;超声波能加快纤维素在磷酸中的溶解速率,常温时纤维素完全溶解在磷酸中需要72 h,而微波条件下纤维素完全溶解在磷酸中只需2 h。
Phosphoric acid rapidly hydrolyzes cellulose under microwave conditions to obtain glucose, and glucose can replace formaldehyde to prepare a novel environmentally friendly PF (phenolic resin). Microwave power, reaction time and reaction temperature were used as experimental factors, and glucose yield was taken as the evaluation index. The optimal technological conditions for phosphoric acid hydrolysis of cellulose were optimized by orthogonal test. The results showed that the influences of various factors on the hydrolysis of cellulose were reaction temperature> reaction time> microwave power. When the microwave power was 240 W, the reaction temperature was 100 ℃ and the reaction time was 40 s, the glucose content in the hydrolyzate was 80.7 %, Glucose concentration of 40.35 g / L; ultrasonic can accelerate cellulose dissolution rate in phosphoric acid, cellulose at room temperature completely dissolved in phosphoric acid takes 72 h, while under microwave conditions cellulose is completely dissolved in phosphoric acid only 2 h .