DETERMINATION OF MOLECULAR MASSES FOR PETROLEUM DISTILLATES BY SIMULATED DISTILLATION

L. Carbognani, L. Díaz-Gómez, T. Oldenburg, P. Pereira-Almao
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引用次数: 7

Abstract

Determination of Molecular Mass (MM) for petroleum distillates is explored for selected samples via High Temperature Simulated Distillation (HTSD). MM is determined as a by-product from routine HTSD carried out using open wall capillary columns coated with apolar stationary phases. No sample pre-separation into hydrocarbon group-types is required. Determined MM values were validated with results achieved via correlations based on specific gravity and refractive index. Furthermore, determined MM with the former methodologies were found to match mass spectrometric determinations carried out for the basic polar components present within the studied samples. Moreover, HTSD analyzed petroleum distillates are proposed as more representative calibration standards for size exclusion chromatographic separations, thus opening the feasibility of extrapolating MM determination for non volatile petroleum residua.
模拟蒸馏法测定石油馏分油分子质量
采用高温模拟蒸馏(HTSD)技术对石油馏分油的分子质量进行了测定。MM是常规HTSD的副产物,使用涂有极性固定相的开壁毛细管柱进行测定。不需要将样品预先分离成烃类类型。确定的MM值通过基于比重和折射率的相关性获得的结果进行验证。此外,发现用前一种方法确定的MM与研究样品中存在的基本极性组分进行的质谱测定相匹配。此外,HTSD分析的石油馏分可作为粒径排除色谱分离的更具代表性的校准标准,从而为非挥发性石油残渣的MM测定提供了外推的可行性。
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