响应曲面法优化超声提取风化煤中腐殖酸

Ultrasound-assisted extraction of humic acid from weathering coal with response surface methodology

本研究基于单因素分析实验,利用响应曲面法对超声提取风化煤中腐殖酸的工艺条件进行优化.选取液固比(mL/g)、超声功率(W)、超声时间(min)为自变量,腐殖酸提取率(%)为响应值,采用Box-Behnken设计方法,研究自变量及其交互作用对腐殖酸提取率的影响,并对实验数据进行分析,得到自变量与响应值(腐殖酸提取率)的二次多项式回归方程.实验分析得出,超声提取腐殖酸的最佳条件为:液固比为11.4 mL/g,超声时间62 min,超声功率220W.通过响应曲面法优化得到的工艺参数准确、可靠,能使腐殖酸的提取率得到有效的提高,可达59.12%.

Studied on the ultrasound-assisted extraction of humic acid from weathering coal based on the single test,the optimum conditions for the ultrasonic extraction of humic acid from weathering coal are investigated by using response surface methodology.The ultrasonic extraction time,ultrasonic power and the ratio of water to material are studied with Box-Behnken design and their interactive effect on the extraction rate of humic acid are also investigated.The predictive model of polynomial quadratic equation is analysed by design expert software.The results indicate that the optimum extraction conditions of the humic acid from weathering coal are as follows:Ratio of water to material 11.4 mL/g,ultrasonic time 62 minutes,ultrasonic power 220 W.The process parameters optimized by response surface method are accurate and reliable,and the extraction rate of humic acid can be effectively improved,reach to 59.12%.