Adjustment of the dry point of finished gasoline

There is no additivity for boiling range, so it cannot be adjusted.

Regarding the claim about the second floor, I agree to some extent, but interestingly enough, this is exactly how things are balanced in practice. To increase gasoline production, our company has recently raised the dry point of catalytic gasoline to 210 degrees, whereas it was previously 204 degrees. The main reason for this is that the dry point of the gasoline we produce is currently on the higher side, below 200 degrees. But I can’t explain why this harmony is possible; I’d like to hear the insights of fellow sailors.

It’s easy to lower something that’s too low, but difficult to raise something that’s too high

It’s a pity it’s the dry point of gasoline; if the copper sheets in gasoline are corroded or if it’s the freezing point of diesel, it’s easier to adjust those values.

I’ll use a more vivid analogy here. . . It’s like the ocean – what matters there is the salinity of the seawater. If one day you add 10,000 tons of salt to it, that might make that particular area of water saltier, but it won’t affect the salinity of the entire ocean, because after all, the ocean is extremely vast. . . By the same logic, if you have a gasoline tank with a capacity of 10,000 cubic meters containing gasoline with an octane rating of 200, and one day you add to it a truck’s worth (about 40 tons) of gasoline with an octane rating of 220, which is of inferior quality, it’s clear that this won’t cause any significant problem; it won’t have much of an impact on the octane rating of the gasoline produced. . . Regarding the mixing of dry ingredients, no practical and usable formula has yet been established. However, if people know how to use simulation software such as HYSYS and ASPEN, they can conduct an oil blending experiment on a computer to find out. . . :lol

The dry point is determined by placing 100 milliliters of gasoline in a small flask equipped with a side tube, inserting a thermometer, and carrying out heating distillation. The temperature indicated by the thermometer at the moment the first drop of oil is distilled is called the initial boiling point. The temperature when the volume of the distilled liquid reaches 10 milliliters is called the 10% point; similarly, the 20% point, 30% point, and so on can be determined, until finally the temperature at which the last drop of oil is distilled is reached – this is the dry point. Since oil is a mixture, it can be understood in this way: the dry point at 210°C represents the combined effect of all its components. Therefore, to lower the dry point, it is possible to do so by adjusting the proportions of these components at that point. This is probably an example of something being theoretically unadjustable, but not in practice: lol, the instrument has been deceived. It’s understandable that this is difficult to calculate using formulas; just try conducting some experiments

Proportionally blending gasoline can result in a slight decrease in its dry point, but this increases the proportion of reformed gasoline in the total gasoline supply, at the expense of catalyzed gasoline. It’s unreasonable for the economy version. A content of 90%–dry point is too high and not acceptable

During actual operation, the dry point of the 2,600-ton batch of 93# finished gasoline was 208 degrees, which is not up to standard. I added 120 tons of alkylated oil, 150 tons of reformed distillate oil, 100 tons of MTBE, and 50 tons of reformed gasoline to flush the pipelines. The final result for the finished product is 202.9 dry points. Thank you all for your help. :) This post was last edited by mcell on 2009-2-26 21:02 ]

I might have made a mistake with my first post; there are mixing formulas on this forum, which I saw after posting my message. You can look for them. In reality, our company has also done this in the past: the laboratory conducts sample analyses first, and then the mixture is prepared in larger containers. But it contradicts theory.