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以裙带菜孢子叶残渣为原料进行水热液化制备乙醇酸,并采用响应面法优化了该工艺。首先,通过单因素实验分析了甲胺浓度、温度、固液比、时间4个关键因素对乙醇酸产率的影响,得到单因素条件下乙醇酸的最高产率为34.64g/L。进一步利用中心组合设计原则对4个关键因素进行实验设计,以乙醇酸产率为响应值,采用响应面法对实验结果进行方程回归,得到4个因素与响应值的回归模型。响应面法优化后的水热液化条件为甲胺浓度4.86mol/L、温度216.73℃、固液比1:6.25、时间37.49min,该条件下乙醇酸的产率达到36.46g/L,比单因素实验的最高产率高出1.82g/L。最后通过方差分析和平行实验,证明该模型准确可用,且平行实验的实际值与预测值的误差仅为0.84%。
Glycyrrhizic acid was prepared by hydrothermal liquefaction of Wakame spore residue as raw material, and the process was optimized by response surface methodology. Firstly, the effects of methylamine concentration, temperature, solid-liquid ratio and time on the yield of glycolic acid were analyzed by single factor experiments. The highest yield of glycolic acid under single factor was 34.64g / L. Four key factors were further experimentally designed using the central composite design principle. The yield of glycolic acid was used as the response value, and the response surface method was used to conduct the regression analysis of the experimental results. The regression model of the four factors and the response value was obtained. Response surface methodology was optimized for the hydrothermal liquefaction conditions: methylamine concentration 4.86mol / L, temperature 216.73 ℃, solid-liquid ratio 1: 6.25, time 37.49min, the yield of glycolic acid under this condition reached 36.46g / L, The highest yield of factor experiments was 1.82 g / L higher. Finally, ANOVA and parallel experiments show that the model is accurate and accurate, and the error between the actual value and the predicted value of parallel experiment is only 0.84%.