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采用响应面法对微波加热浓缩KOH溶液的新工艺过程进行优化。选取微波功率、加热浓缩时间、物料量为自变量,KOH溶液浓缩为响应值,研究各因素及其交互作用对KOH溶液浓度的影响。利用中心组合设计原理进行三因素五水平的试验设计,并作响应面分析,建立二次回归模型。结果表明,曲面回归方程拟合性好,微波加热浓缩KOH溶液的最佳工艺参数为微波功率734 W,加热浓缩时间为45min,物料量为960mL。在此条件下进行实验,可将质量分数为50%的KOH溶液加热浓缩至71.22%,与理论值70.61%基本吻合。说明应用响应曲面法优化得到微波加热浓缩KOH溶液的工艺条件合理,为工业化应用提供了可行性依据。
Response Surface Methodology was used to optimize the new process of microwave heating concentrated KOH solution. Microwave power was selected, the concentration time was heated, the amount of material was independent variables, KOH solution was concentrated to the response value, the impact of various factors and their interaction on the concentration of KOH solution. The central composite design principle is used to carry out the experimental design of three factors and five levels, and response surface analysis is used to establish the quadratic regression model. The results show that the regression equation of surface fitting is good. The optimum technological parameters of microwave heating concentrated KOH solution are microwave power 734 W, heating concentration time 45 min, material quantity 960 mL. Experiments under this condition, the mass fraction of 50% KOH solution was concentrated to 71.22% by heating, basically consistent with the theoretical value of 70.61%. It shows that the process conditions of microwave heating concentrated KOH solution are optimized by the response surface method, which provides a feasible basis for industrial application.