How is this calculated?
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The classification method for key fraction characteristics in crude oil evaluation: the second key fraction is taken at 275–300°C under 40 mmHg, a temperature equivalent to 395–425°C at atmospheric pressure. May I ask how these two temperatures are converted into one another?
It must be the results of experiments; there are things that cannot be accurately \"calculated\"
Is it calculated based on the vapor pressure of a substance at specific pressures and temperatures? The vapor pressure at 40 mmHg and 275–300°C is comparable to that at standard pressure and 395–425°C. That is probably the essence of vacuum distillation.
It should be calculated by conversion; one needs to consult the relevant chemical engineering calculation chart sheets. Take a look at the book \"Petroleum Refining\" or the \"Handbook of Calculated Charts for Petrochemical Engineering\"; they contain charts showing the values at different pressures. Give it a try!
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