To meet requirements with regard to distillation data and saturated vapor pressure of winter and northern grades of automobile gasolines, we may use as the light components of the fuel butane, isopentane, isomerizate, and the light fractions of straight-run and gas naphtha, or various mixtures of these components.
The authors have plotted the decrease in the 10 and 50% distillation temperatures of base gasolines with differing distillation data versus the amount of butane and 23–62 and 34–67°C light hydrocarbon fractions added. These graphs enable us to calculate the necessary amounts of components for obtaining northern, winter, and summer grades of automobile gasolines with distillation data in line with requirements.
The paper gives data characterizing the change in the IBP of base gasolines due to compounding with butane and other light hydrocarbon fractions.
It is shown that butane has little effect, and a mixture of C4, C5, and C6 fractions virtually no effect, on the decrease in the 90% distillation temperature and the FBP of base gasolines.
Addition of 1% of butane, isopentane, the straight-run 23–62°C fraction, and the 34–67°C gas-naphtha fraction increases the saturated vapor pressures of base gasolines (with saturated vapor pressure of 100 to 400mm Hg) by 35–40, 14–7, 12–5.5, and 9-3.5 mm Hg, respectively.
A lower limit of the saturated vapor pressure of winter grades of automobile gasolines of 500 mm Hg may be obtained if the 10% distillation temperature is not more than 50°C.
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Translated from Khimiya i Teknologiya Topliv i Masel, No. 9, pp. 11–16, September, 1969.
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Vol'f, M.B., Ivchenko, E.G., Nazarova, L.Y. et al. Change in the distillation of automobile gasolines by addition of light hydrocarbons. Chem Technol Fuels Oils 5, 627–632 (1969). https://doi.org/10.1007/BF00729680
- Lower Limit
- Vapor Pressure