基于响应曲面法模拟优化褐煤腐植酸碱提工艺条件

摘要

通过响应曲面模型的建立,考察变量因素之间的相互作用,在减少实验操作次数的基础上,模拟优化出最佳的提取条件.选取碱提工艺中的碱液质量浓度、液固体积质量比和溶出时间作为变量因素,以腐植酸的提取率为响应值,进行了三因素三水平的Box-behnken的中心组合设计试验.结果表明:预测的最优碱提工艺条件为碱液质量浓度0.049 8 g/mL,液固体积质量比10.44mL/g,溶出时间3.4h;腐植酸的预测提取率为17.51％,验证实验的平均提取率为17.05％,与模型预测值相吻合.%Through establishing the response surface model,the interaction among different variables was investigated,and on the basis of reducing the operating times,the optimum extraction conditions were simulated.Taking three major factors,alkali mass concentration,liquidsolid ratio and leaching time as independent variables,the extraction rate as the response value,three factors and three levels of Box-behnken central composite test was adopted.The results show that the optimum condition as follows:alkali mass concentration is 0.049 8 g/mL,liquidsolid ratio is 10.44 mL/g,leaching time is 3.4 h and the predicted extration rate reach to 17.51％.As the experimental extration rate is 17.05％,the actual value is in a good agreement with the model predicted value.