Abstract

The results of using capillary chromatographic columns with different stationary phases were compared to determine the purity of isopropanol obtained by hydrogenation of acetone. The study was performed with columns based on 2-nitroterephthalic acid-modified polyethylene glycol 20М (PEG20М/FFAP), poly(1-trimethylsilyl-1-propyne) (PTMSP032), and trifluoropropyl (25%) methyl silicone elastomer (SKTFT 50Х). The measurement times, asymmetry factors (A_s) of mixture components, and resolutions (R_s) of the acetone/isopropanol and isopropanol/internal standard pairs of compounds were compared; as a result, the PEG20М/FFAP capillary column was chosen. A technique for measuring the mass fractions of acetone and isopropanol using the internal standard method in the gas phase has been developed. n-Butanol was used as an internal standard. The detection limit was 1.45 for acetone, 1.43 for isopropanol, and 1.28 × 10^–12 g/s for n-butanol. The relative standard deviation (repeability factor) did not exceed 4.3% at a confidence level Р = 0.95.

中文翻译：

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气相色谱分析丙酮加氢产物的方法和技术的发展

摘要

通过比较不同固定相毛细管色谱柱的结果来确定丙酮加氢所得异丙醇的纯度。该研究使用基于 2-硝基对苯二甲酸改性的聚乙二醇 20М (PEG20М/FFAP)、聚(1-三甲基硅基-1-丙炔) (PTMSP032) 和三氟丙基 (25%) 甲基硅弹性体 (SKTFT 50Х) 的色谱柱进行。测量时间、混合物组分的不对称因子 ( A _s ) 和分辨率 ( R _s) 的丙酮/异丙醇和异丙醇/内标化合物对进行了比较；因此，选择了 PEG20М/FFAP 毛细管柱。开发了一种在气相中使用内标法测量丙酮和异丙醇质量分数的技术。使用正丁醇作为内标。丙酮的检测限为 1.45，异丙醇的检测限为 1.43，正丁醇的检测限为 1.28 × 10 –12 ^g /s 。在置信水平Р = 0.95时，相对标准偏差（重复性因子）不超过 4.3%  。