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模拟H2O2氧化丙烯的环氧化产物,利用正交实验方法得到了测定H2O2质量分数的最佳滴定条件。结果表明,滴定时被测样品质量对测定结果的影响很显著,KI和H2SO4溶液的加入量的影响显著。当被测丙烯环氧化产物中H2O2的质量分数为0.5%~3.3%时,其最小的滴定样品质量m由式m=0.17/x(x代表被测环氧化产物中H2O2的质量分数)估计,且在滴定过程中KI和H2SO4溶液的加入量分别在3~8ml和2~7ml范围时,测定结果与真实值相吻合。在丙烯环氧化产物中H2O2质量分数相对较低(<0.5%)时,应控制KI和H2SO4溶液的加入量不能超过8ml和7ml,而在H2O2质量分数相对较高(>3.3%)时,应控制KI和H2SO4溶液的加入量不能低于3ml和2ml。该规律在后来的实验中得到了验证。
The epoxidation products of H2O2 propylene oxide were simulated, and the optimal titration conditions for the determination of H2O2 mass fraction were obtained by orthogonal experiment. The results show that the quality of the sample under titration has a significant effect on the determination results, and the effect of the addition of KI and H2SO4 solutions is significant. When the mass fraction of H2O2 in the epoxidation product of propylene is 0.5% ~ 3.3%, the minimum titration sample mass m is expressed by the formula m = 0.17 / x (x represents the mass fraction of H2O2 in the measured epoxidation product) It is estimated that the addition of KI and H2SO4 solution in the range of 3 ~ 8ml and 2 ~ 7ml respectively in the titration process is consistent with the true value. When the mass fraction of H2O2 in propylene epoxidation products is relatively low (<0.5%), the amount of KI and H2SO4 solution should be controlled not to exceed 8ml and 7ml. When the mass fraction of H2O2 is relatively high (> 3.3%), Should control the amount of KI and H2SO4 solution can not be less than 3ml and 2ml. The law was verified in later experiments.