Gas Chromatography: Qualitative Composition Of Biogasoline

Gas chromatography is the common method used for the biogasoline analysis. Biogasoline catalytic cracking process requires detailed qualitative and quantitative analysis of the hydrocarbon composition of its oil and fraction.
In this analysis, their fractional composition, saturated vapor pressure, density and antiknock rating will be investigated. By knowing the qualitative and quantitative composition of the gasolines, the content of n-paraffin, isoparaffin, aromatic, naphthene, and olefin (PIANO) groups of hydrocarbons as well as of oxyorganic compounds (alcohols and ethers) used to raise the octane number can be determined. One of the example of the chromatogram of automobile gasolines analysis are as below, Figure 1: Typical chromatogram of automobile gasolines
In analyzing the biogasolines, most of the control laboratories are generally equipped with a variety of gas chromatographs. This analysis is done by using high-resolution capillary columns which allow complete separation of all hydrocarbon components of the analysis mixes. The usage of analytical systems with such columns requires precise demand on standards of data processing systems, especially on the algorithm for automatic identification of the found components. A detailed
Various peaks ranging from methane to n-hexadecane were identified. Usually, the mole fraction of the unidentified peaks of the test gasolines are not higher than 0.5%. The individual components were identified from the relative retention indices. The weight content of each component was calculated by the internal standardization method taking into account of the detector response factor. The concentrations of various classes of hydrocarbon groups were determined by summation of the measured concentrations of individual components. Comparative analysis is carried out in order to indicate the relative hydrocarbon group does not exceed