响应面法优化回收油类分析的萃取剂四氯乙烯

Optimization of recovery conditions of tetrachloroethylene in oil analysis by response surface methodology

采用减压蒸馏法从油类分析废液中回收萃取剂四氯乙烯。以温度(A)、转速(B)和系统压强(C)为因素,以回收率和回收速率为指标,通过三因素三水平Box-Bohnken响应面法优化了回收条件,并用红外测油仪分析了回收产品的质量。结果显示:二次回归模型F值分别为11.69和21.68,P<0.0001,呈现极显著水平;模型相关系数R^(2)分别为0.9376和0.9654,方程拟合程度良好。对四氯乙烯回收率和回收速率影响,由大到小依次A、C和B;二次项C^(2)影响极显著,A^(2)、B^(2)都不显著;交互作用AB、AC、BC都不显著。综合考虑回收率和回收速率,最佳回收条件为温度90℃、转速450 r/min和压强3.34 kPa。回收率和回收速率实测平均值分别为91.65%和5.68 g/min,与预测值94.36%和5.84 g/min接近;产品在2930、2960、3030 cm^(-1)处吸光度分别小于0、0.07和0.340,说明该回收条件切实可行,且回收产品质量达到了标准,可循环再利用。

The extractant tetrachloroethylene was recovered from the waste liquid of oil analysis by the vacuum distillation method.The response surface analysis method were used to confirm the better recovery conditions,with temperature(A),rotational speed(B)and system pressure(C)as factors and recovery yield and recovery speed as targets.The quality of the recovered product was analyzed by infrared oil meter.The results showed that,F values of quadratic regression models were 11.69 and 21.68,respectively,with P<0.0001,which means the fitting model were at extremely significant level.The correlation coefficients R^(2) of the model were 0.9376 and 0.9654,respectively,which means the equations fit well.The influenceson recovery yield and recovery speed of tetrachloroethylene of A,C and B gradually decreased.The influence of C^(2) was significant,while the influences of A^(2),B^(2) were not significant.All the interactions between AB,AC and BC were not significant.The optimized recovery yield and recovery speed were 91.65%and 5.68 g/min respectively,which were close to 94.36%and 5.84 g/min predicted by response surface method,under temperature 90℃,rotation speed 450 r·min^(-1) and system pressure 3.34 kPa.The absorbance of the product at 2930,2960,and 3030 cm^(-1) is less than 0,0.07 and 0.340,respectively,indicating that the recovery method is practical and feasible,and recovered product could be recycled and reused with its quality reached the national standard.