| .棉花秸秆超声波碱预处理研究[J].农业环境科学学报,2013,32(2):. |
| 棉花秸秆超声波碱预处理研究 |
| Study of Ultrasonic-assisted Alkali Pretreatment on Cotton Stalk |
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| DOI：10.11654/jaes.2013.02.027 |
| 中文关键词: 棉花秸秆 稀碱 超声波 参数优化 |
| 英文关键词: cotton stalk dilute alkali ultrasonic parameters optimization |
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| 摘要点击次数: 2496 |
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| 中文摘要: |
| 为了缓解能源危机，充分利用棉花秸秆制备燃料乙醇，采用超声波辅助碱处理方法对棉花秸秆进行预处理。通过单因素试验和Box-Behnken试验，分析超声波辅助碱预处理因素对处理效果的影响规律，建立预处理时间、氢氧化钠浓度、液固比与纤维素、木质素含量之间的回归关系，据以优化工艺条件。结果表明，所建回归模型显著，具有预测意义。各因素对棉花秸秆预处理效果影响主次顺序为处理时间＞氢氧化钠浓度＞液固比，超声波辅助碱预处理棉花秸秆的优化条件为超声波功率420 W、氢氧化钠浓度3.5%、处理时间90 min、液固比21∶1，处理后秸秆中纤维素含量达58.02%，比原秸秆提高了45.60%。处理前后棉花秸秆结构SEM观察，显示超声波辅助碱预处理可以溶出大量半纤维素和部分木质素，并且有效打破木质纤维素的结晶结构，具有显著效果。 |
| 英文摘要: |
| Suitable pretreatment is essential for increasing the utilization rate of cotton stalk in ethanol production. Ultrasonic wave was used together during the pretreatment of cotton stalk using alkali solution and the conditions were optimized. The single-factor design and the Box-Behnken design were used to arrange the experiments and analyze the obtained data. Regression models were established to express the influences of treating time, sodium hydroxide concentration, and liquid to solid ratio on the contents of cellulose and lignin in the treated cotton stalk. The obtained models were significant in the tests, indicating its capability in predicting results. The tested factors showed influence on the contents of cellulose and lignin in the treated stalks following the order of treating time>sodium hydroxide concentration>liquid to solid ratio. The optimum conditions for the highest cellulose content and the lowest lignin content were obtained at ultrasonic power 420 W, sodium hydroxide 3.5%, processing time 90 min, and liquid to solid ratio 21∶1. The resulted cellulose content in the treated cotton stalk under the optimum conditions was 58.02%, being 45.60% higher than the original value. Images of Scanning Electronic Microscopy showed that most hemicellulose and part of lignin were dissolved out of the stalk during the pretreatment and thus the crystalline structure was efficiently broken. Overall, application of ultrasonic wave showed remarkable effect on the alkali pretreatment of cotton stalk. |
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