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气相色谱法快速测定石油苯中甲基环己烷含量
Rapid Determination of Methylcyclohexane Content in Petroleum Benzene by Gas Chromatography
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- DOI:
- 作者:
- 牛艺霖，王雨薇，魏盼荣，陈世龙，张高杰
Niu Yilin, Wang Yuwei, Wei Panrong, Chen Shilong, Zhang Gaojie
- 作者单位:
- 中国石油兰州石化公司
PetroChina Lanzhou Petrochemical Company
- 关键词:
- 石油苯；甲基环己烷；气相色谱法
petroleum benzene; methylcyclohexane; gas chromatography
- 摘要:
- 某公司为满足苯产品分析需求，采用气相色谱法建立了石油苯中甲基环己烷测定方法。通过内标法试验验证，色谱操作条件为柱温50 ℃，柱流量0.9 mL/min，分流比90∶1，并确定最佳色谱操作条件及相对校正因子，用于测定甲基环己烷的含量。实验表明，石油苯中甲基环己烷与其它非芳烃组分可以有效分离，检出限为0.000 2%（质量分数），检出限和定量限低；甲基环己烷加标回收率为 94.74%~102.44%，精密度相对标准偏差为 1.1%~4.2%，精密度和准确度较好。该方法操作简单，准确度高，可用于测定石油苯中甲基环己烷，为控制产品质量提供技术支撑。To meet the analytical requirements for the company′s benzene products, a gas chromatography method was establishedfor the determination of methylcyclohexane in petroleum benzene. Through validation experiments using the internal standardmethod, the optimal chromatographic operating conditions were determined as follows: column temperature at 50 ℃, column flowrate at 0.9 mL/min, and a split ratio of 90∶1. The relative correction factor was also established under these optimal conditions forquantifying methylcyclohexane content. The experiments demonstrated that methylcyclohexane in petroleum benzene could beeffectively separated from other non-aromatic components. The method exhibited a low detection limit of 0.0002% (mass fraction)for methylcyclohexane, with both the detection limit and limit of quantification being notably low. The recovery rates ofmethylcyclohexane through spiking ranged from 94.74% to 102.44%, and the relative standard deviation for precision was between1.1% and 4.2%, indicating good precision and accuracy. This method is simple to operate, highly accurate, and suitable fordetermining methylcyclohexane in petroleum benzene, thus providing technical support for quality control of the product.