响应面法优化大豆秸秆乙醇预处理条件

Optimization of Ethanol Pretreatment of Soybean Straw by Response Surface Method

用秸秆等木质纤维素原料制备生物质燃料(乙醇)时,预处理是重要的一个步骤。与其他预处理方法相比,乙醇预处理后抽出组分纯度高,预处理液更易回收。因此,采用响应面法对大豆秸秆乙醇预处理过程中的预处理条件进行了优化。首先,在单因素实验的基础上找出中心点,通过中心组合条件运用响应面法优化得到了大豆秸秆乙醇预处理最佳条件:保温温度170℃,保温时间90 min,乙醇体积分数50%。经软件Minitab17分析,保温温度对大豆秸秆预处理得率和还原糖得率影响最为显著。对预处理后固料进行成分分析发现,乙醇预处理主要脱除大豆秸秆中的半纤维素和木素。在最佳预处理条件下,大豆秸秆中木素脱除率为61.95%,半纤维素脱除率为82.85%。

The ethanol converted from lignocellulose is called the second generation of bioethanol. Pretreatment is an important step in the process of bioethanol production. Compared with other pretreatment methods, ethanol pretreatment has many advantages such as high-purity of extraction constituents, easily recycling of pretreatment liquid. In this paper, on the basis of single factor experiment and response surface method, the optional ethanol pretreatment condition of soybean straw was obtained, it was at 170~C for 90 min with 50% ethanol concentra- tion. Through analysis by Minitabl7 software, it was found that the effect of temperature was the most significant on pretreatment yield and reducing sugar yield. Analysis results showed that the hemicellulose and lignin were mainly removed during ethanol pretreatment. Under the optimal pretreatment condition, the removal rate of lignin was 61.95% , and the removal rate of hemicellulose was 82.85%.