Experts in gasoline blending, please invest!
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I would like to know the relationship between the saturated vapor pressure of gasoline and Sinopec’s additional indicator, the evaporation index. The saturated vapor pressure is the pressure exerted by the gasoline vapor on the walls of the container when the evaporation of gasoline reaches equilibrium. It is used to determine the degree of tendency for gasoline to experience \"gas blockage\". The gasoline boiling range specifies that the 10% distillation temperature should not exceed a certain value, in order to ensure the engine’s ability to start. However, when the 10% distillation temperature is too low, gas blockage is likely to occur. The higher the saturated vapor pressure of gasoline, the more light components it contains; this results in better volatility. As a result, there is a greater likelihood of \"vapor obstruction\" in the engine’s fuel system during use, and more evaporation losses occur during storage. However, its starting performance is better. The evaporation index is equal to 10% distillation temperature * 1.5 + 50% distillation temperature * 3 + 90% distillation temperature + 11 * oxygen content. Could someone please explain the relationship between these values and the purpose of their control?
The evaporation index is primarily a measure taken by Sinopec to prevent the entry of chemically blended oils. An uneven boiling range will result in a higher evaporation index.