气相色谱法测定丙烯气中微量甲醇的方法改进

Improvement of Determination of Trace Methanol for Propylene by Gas Chromatography

将国标GB/T12 70 1- 90测定丙烯中微量甲醇的方法进行了改进 ,采用大口径开口管柱代替了原方法中的填充柱 ,色谱操作条件也作了相应的改变 ,改进后与原方法比较具有基线稳定 ,分离效果好 ,分析时间短 ,回收率在 96 .9%～10 2 .7%之间 ,相对标准偏差小于 8.5 4 %。新方法准确可靠 ,操作简单 ,适合于乙烯厂中丙烯气的中控分析。

Determination of trace methanol in propylene by gas chromatography was improved,packed column used originally was replaced with capillary column and condition of chromatograph was modificed.Baseline of chromatograph was stable, the separation of chromatograph got well,analyse time was saved, The results showed the recovery rate is 96.9 %～102.7 %,and RSD<8.54 % .The new method is simple , accurate , rapid and suit to controlling analysis for propylene in ethylene plant.