Initial boiling point of alkylated oil
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I feel that the initial boiling points of our alkylated oils sometimes don’t quite match their vapor pressures; oils with the same initial boiling point seem to have higher vapor pressures than gasoline produced by catalytic or coking processes. Is that correct? Please discuss it and explain the reasons. Thank you.
Gasoline is a mixture, and its vapor pressure does not correspond perfectly to its initial boiling point; this is related to the specific composition of the gasoline. If the initial boiling point of a petroleum product is around 45 degrees, but the boiling temperature of 5% of its distillate is 120 degrees, then the vapor pressure of this oil will not be very high. In contrast, if a petroleum product has a initial boiling point of 55 degrees, but its 50% distillation temperature is only 80 degrees, its vapor pressure will be high. You should understand the specific nature of these two indicators as well as the actual factors that influence them.
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The light components in the product are not limited to n-butane; a similar situation can occur if large amounts of C5 and C6 hydrocarbons are present in the product. Additionally, if the raw materials contain C5 hydrocarbons, side reactions can occur during the reaction mechanism, resulting in an excess of these light components such as C5 and C6. I have consulted many people on this issue, but their explanations were all quite general and did not address the core of the problem