Diesel flash point issue
Thread Content
The extraction temperature is high; is the flash point high or low, and why?
The diesel flash point is related to the stripping steam and residence time; a high extraction temperature will affect the final boiling point!
It depends on the degree of overlap between the upper and lower fractions; the greater the overlap, the lower the flash point will be. Furthermore, a high extraction temperature will make the fraction heavier.
The normal control parameters are the amount of stripping steam and the liquid level in the tower (i.e., residence time). Is there a significant relationship between the extraction temperature of the stripping tower, the amount of stripping steam, and residence time?
The flash point is mainly related to the light components in diesel; a higher extraction temperature has little to do with these light components. If there is any relevant factor, it is that, with the stripping steam temperature, amount of stripping steam, and stripping time remaining unchanged, more light components are stripped out, resulting in a slight decrease in the amount of light components in the final diesel ； In that case, lightning will increase slightly.
High extraction rate, high final boiling point, high flash point – for reference only!
It should be high; theoretically, the flash point is related to the 10% distillation range, but in actual production, the initial boiling point is generally what is taken into consideration. Upon reaching the diesel stripping tower, the high temperature causes excessive light components to evaporate, leaving behind more heavy components, which results in a higher overall initial boiling point and dry point.
With a high extraction temperature, the overall temperature of the fractionation tower increases, the dry point of gasoline rises, and as the temperatures in the diesel fraction range increase as well, the flash point should also increase.
If the extraction temperature is high, the temperature of the entire distillation column will also be high. If more light components are carried away, the flash point will increase, right? Personal opinion