Evaluation of the effect of the mobile phase on the separation efficiency of the aromatic hydrocarbon fraction, obtained by means of the sara analysis technique
DOI:
https://doi.org/10.26423/rctu.v6i2.456Keywords:
SARA, aromatics, mobile phase, solvents, hydrocarbons, chromatographyAbstract
This research shows influence of mobile phase, as chromatographic variable, on the fraction of aromatic hydrocarbons in SARA separation, in order to establish impact on optimization of separation process. The methodology used was to perform 32 chromatographic separations to 32 maltene subsamples, varying the mobile phase to elute the aromatic hydrocarbons between toluene, benzene and a DCM / n-hexane mixture (30:70 v / v). The results obtained revealed that the mobile phase variation affects the extraction percentage of the fraction under study, depending on the nature of the solvent. When toluene and benzene are used as the mobile phase, the results are statistically the same and differ from that obtained by the DCM / n-hexane mixture, the extraction order being the following: toluene ≥ benzene> DCM / n-hexane, however, the fractions of aromatic hydrocarbons extracted with the mixture have experimental evidence of being purer than those obtained with the rest of the solvents used.
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