【摘要】 提出了可以分析丙烯氨氧化合成的丙烯腈中微量杂质的气相色谱法.采用癸二酸二壬酯/6201型担体色谱柱,可以使乙腈在丙烯腈之前流出,提高了分析乙腈的灵敏度.文中列出了各微量杂质的最低鉴定量,测定的标准误差在±10％以内.总分析时间约1小时.更多还原

【Abstract】 A gas chromatographic technique with flame ionization detection is described for the determination of trace impurities in acrylonitrile obtained from ammonoxidation of propylene. Instead of the strong polar column conventionally used, the method uses a dinonyl sebacate-firebrick column which brings the acetonitrile to elute prior to the acrylonitrile, and thus the detection sensitivity for acetonitrile is improved. The detection limits of the various impurities for a 10 microliter sample are as follows: acetaldehyde 1.7 ppm, acetone 2.2 ppm, acrolein 1.8 ppm, acetonitrile 4.2 ppm, and propionitrile <36ppm. Standard error of the method is less than ±10% (for propionitrile, ±15%). A complete analysis takes about an hour.更多还原