Gasoline: Where have the components at both ends gone?
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Problem description: In the gasoline hydrogenation unit, heavy gasoline and light gasoline are mixed together in the same pipeline (referred to as blended gasoline) before being sent out of the unit. Samples of heavy gasoline and light gasoline are taken separately before mixing, and a sample of the blended gasoline is taken as well, 3–4 meters after mixing. Distillation range analysis: Light gasoline: 25, 30, 35……60, 65; Heavy gasoline: 80, 87, 98……185, 198; Blended gasoline: 40, 47……192. My question is: What happened to the components in the 25–40°C range and those in the 192–198°C range? I remember that the boiling range is a cumulative parameter (the temperature at the mixing point is around 40 degrees, and the pressure is about 1.0 MPA)
The light components should have been absorbed by the heavy components; the heavy components are not easy to understand.
For the light components, they are essentially dissolved in the heavy components, which leads to an increase in the initial boiling point; as a result, the fraction with a boiling point of 25–40°C disappears； For the heavy components, the addition of light components leads to a decrease in their proportion, affecting all temperature points (boiling point, 10%, 20%, …). . . . 90%, as well as the final boiling point), decreased, indicating the disappearance of the 192–198°C fraction.
What is the mixing ratio? It is also necessary to see what proportion the original light and heavy components accounted for.
Light oil is dissolved in heavy oil, and it should be able to evaporate during distillation.
Can the boiling range also be neutralized? I remember that in the adjustment of oil products, the boiling range is a parameter that is added together
Heavy gasoline: Light gasoline = 2:1
In the original oil analysis, what were the proportions of the 25–40°C fraction and the 192–198°C distillate respectively?
When light and heavy gasoline are mixed, the azeotrope temperature of the mixture rises, as does its initial boiling point; the proportions also change, with values such as 10% and 50% resulting in an increase. Furthermore, the temperature at your mixing point is over 40 degrees, which results in losses of light components. The higher the proportion of heavy components, the higher the initial boiling point. It’s the same when we blend oils: when an oil with an initial boiling point of 38 degrees is mixed with 30% isopentane, the initial boiling point drops by 4 degrees; adding more isopentane can further reduce it to 32 degrees, rather than the 28 degrees that would be obtained if only isopentane were used. As for the final boiling point, there isn’t much change – the heavy components still evaporate last. Could the values of 192 and 198 be errors, given that it’s easy to get inaccuracies when determining the final boiling point of gasoline?