用改进的尿素络合法测定石蜡、微晶蜡中正异构烷烃含量

采用正交试验，通过与气相色谱法测定结果进行对照，确定了用改进的尿素络合法测定石蜡的正异构烷烃含量的最佳条件；尿素与石蜡用量之比为3：1（m/m），活化剂与尿素用量之比为0．18：1（m/m），反应时间2h，反应温度25℃。实验结果表明，该法不但可以测定石蜡，而且可发测定微晶蜡和混合蜡中正异构烷的含量，其结果与色谱法测定基本一致。

Determination of the Contents of n-and i-Paraffins in Paraffin and Microcrystalline Waxes by Modified Urea Adduction

Using the orthoganal design method, the optimum conditions were determined in measuring the contens of n- and i-paraffins in paraffin waxes by urea adduction. The weight of urea is three times of that of waxes, the weight of activating agent is 18% of that of urea, the reaction time is 2h and the reaction temperature is 25°C. The method of measuring the contents of n- and i-paraffins in paraffin waxes by urea adduction under those conditions determined by this paper called modified urea adduction. The results show that the modified urea adduction not only could measure the contents of n- and i-paraffins in paraffin waxes, but also could measure that in microcrystalline waxes and mixed waxes, the numerical data agree well with that measured by GC.