采用模拟蒸馏对原油馏分分布的色谱法测定

Determination of Fractional Distribution of Crude Oil by Gas Chromatography with Simulated Distillation

提出了色谱模拟蒸馏测定原油馏分分布的方法,采用高温模拟蒸馏分析原油中重组分,用详细烃组成技术(DHA方法)分析原油中轻组分,通过组分整合得到原油馏分分布。试验表明:采用nC5～nC120的正构烷烃混合物作为模拟蒸馏的沸点校正样,分析的馏程范围为初馏点至750℃。该方法重复性好,初馏点和终馏点的标准偏差小于1℃,各馏分收率的标准偏差小于0.35%。此法与实沸点蒸馏方法结果基本一致,小于500℃各馏分的收率差值小于2.5%,可明显看出在500～750℃范围的馏分分布,有利于重质馏分的进一步加工利用。

Gas chromatographic simulated distillation was applied to the determination of fractional distribution of crude oil.Heavy fraction of crude oil was analyzed by the high temperature simulated distillation（SIMD）,and the light fraction by the technique of DHA hydrocarbon pre-preparation.Fractional distribution of crude oil was obtained through componental arrangement.Mixture of strainght chain alkanes（or n-alkanes） with C5-C120 was used as standard for correction of boiling point in the range of distillation from initial boiling point（IBP） to 750 ℃.Good repeatability was obtained by this method,giving values of standard deviation,at both the IBP and the final boiling point,less than 1 ℃,and values of RSD′s of various fraction yields less than 0.35%.Results obtained by this method were in consistency with those found by the method of true boiling point distillation.Yield differences between fractions under 500 ℃ were less than 2.5%.It was shown that the fractional distribution between 500-750 ℃ was valuable for further processing and utilization of the heavy fractions of crude oil.