How are the freezing point and flash point controlled using a distillation tower? I don’t understand the principle
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I know it’s related to the inlet temperature of the distillation column, the top temperature of the column, and the reflux ratio, but I’m not quite sure how to control them
Low flash point: increase the bottom temperature of the tower; high flash point: decrease the bottom temperature of the tower
The freezing point is related to the selectivity of the corresponding catalyst, while the flash point is related to the initial boiling point or the first 10% of the distillate.
I think the same way. However, the tower top temperature also needs to be adjusted appropriately
One more question: what is the dry point of that heavy gasoline? I see that all the internal adjustments we do here are to adjust the tower top temperature and reflux. I don’t quite understand the principle; I only know that as the temperature rises, the amount of light components decreases. However, I’m not clear about the relationship between light components and parameters such as flash point, freezing point, and dry point. Could someone please explain this in detail?
First, go and figure out the definitions of flash point, dry point, and freezing point
First, go and figure out the definitions of flash point, dry point, and freezing point
The heavier the oil, the lower its freezing point and the higher its flash point. As an example of the freezing point: at 0°C, paraffin is in a solid state while gasoline is in a liquid state. As an example of the flash point: crude oil does not ignite easily, whereas gasoline does. By controlling the temperature at the bottom (and mainly at the top) of the distillation tower, it is possible to regulate the amount of gasoline-like components in diesel, thereby controlling its flash point and freezing point. The above are all my personal interpretations