毛细管气相色谱法分析轻烃族组成

ANALYSIS OF HYDROCARBON GROUP COMPOSITION OF LIGHT CRUDE OIL BY CAPILLARY GAS CHROMATOGRAPHY

利用气相色谱快速、准确的分析特点 ,采用长 30m ,内径为 0 .2 2mm的OV - 1 0 1石英毛细管柱 ,对辽河油田轻烃组分进行了分析 ,使用Kov ts保留指数、纯物质、次甲基插入反应定性了所有组分。用归一化法测定了其中的各个族组成含量。计算出族组成的质量分数。改进了采用硅胶作固定相的柱色谱对轻烃族组成分析的不足。采用部分色谱纯物质考察了定量分析的准确度和精密度 ,其相对误差在 0 .371 %～ 2 .86 %。正构烷烃、异构烷烃、环烷烃、芳烃的质量分数分别为 30 .833%、2 4 .2 6 8%、4 2 .6 4 3%、2 .2 5 6 %。

By using (30 m×0.22 mm i.d.) OV-101 column, group composition of light crude oil in Liaohe oil field was analyzed by the method of capillary gas chromatography with the characteristics of speediness and accuracy. The components of light crude oil were determined by the Kovts indices, pure sample and methyne inserted reaction, quantified by normalizing method. The mass fraction of group composition was worked out accurately. The method of analysis hydrocarbon group composition of light crude oil was modified. The accuracy and precision of the method were checked by some pure samples. The relative deviation is 0.371%～2.86%. The mass fraction of normal alkane, isoalkane, cyclanes and aromatic are 30.833%, 42.643%, 24.268% and 2.256% respectively.