ZnCl2.4H2O/尿素溶剂体系中玉米芯分馏溶解条件的优化:统计学方法

O. Ejekwu, A. Ayeni, M. Daramola
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引用次数: 2

摘要

选择合适的预处理方法和调整预处理参数以有效地将生物质转化为增值产品是成功的生物炼制概念的关键。采用ZnCl2.4H2O/尿素对玉米芯进行预处理,并进行了优化。采用响应面法考察了预处理条件对ZnCl2.4H2O/尿素预处理玉米芯过程中纤维素、半纤维素回收率的影响,并对预处理条件进行了优化。对实验结果进行了分析,并为每个响应建立了适当的预测经验线性模型。时间、温度和溶剂浓度对纤维素的回收率有显著影响。半纤维素回收率受时间和溶剂浓度的影响,木质素回收率受时间和温度的影响。利用期望函数进行数值优化,得到最佳预处理条件为:90 min, 120℃,ZnCl2.4H2O/尿素浓度为71.32%/28.68 (w/w)。在此条件下,纤维素、半纤维素和木质素的预期回收率分别为99.03%、27.18%和72.43%,理想回收率为0.902。在相同条件下,纤维素、半纤维素和木质素的实际回收率分别为91%、29%和68%。这些结果表明,所研究的变量对玉米芯预处理有显著的影响。因此,在转化为增值产品之前,需要最佳条件来回收所需的成分。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Optimization of Dissolution Conditions During Fractionation of Corn-cob in ZnCl2.4H2O/Urea Solvent System: A Statistical Approach
The choice of a suitable pretreatment method and the adjustment of the pretreatment parameters for efficient conversion of biomass to value-added products is crucial to a successful biorefinery concept. Pretreatment of corn cob using ZnCl2.4H2O/ Urea was carried out and optimized in this study. Effect of pretreatment conditions on cellulose recovery, hemicellulose recovery during the pretreatment of corn cob using ZnCl2.4H2O/ Urea was investigated via response surface methodology approach and optimized in this study. Experimental results were analysed and appropriate predictive empirical linear models were developed for each response. For cellulose recovery, time and temperature, and solvent concentration were significant factors. Hemicellulose recovery in the liquid fraction is impacted by time and solvent concentration, while lignin recovery is affected by time and temperature. Using numerical optimization by desirability function, optimum pretreatment conditions obtained were: 90 min, 120°C and concentration of 71.32%/28.68 (w/w) ZnCl2.4H2O/ Urea. At these conditions, the predicted recovery for cellulose, hemicellulose and lignin were 99.03%, 27.18% and 72.43%, respectively, with a desirability of 0.902. The actual recovery was 91%, 29% and 68% for cellulose, hemicellulose and lignin, respectively, at the same conditions. These results indicate that the investigated variables have pronounced effect on the pretreatment of corn cob. Therefore, optimum conditions are required for recovery of desired composition before conversion to value-added products.
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