Master-level questions on the control of the dry point of gasoline in catalytic fractionation towers
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In our plant, the pressure in the first catalytic distillation column is generally kept between 0.12 and 0.13, while the temperature is maintained between 110 and 120. As a result, the dry point of the gasoline falls within the range of 190 to 200. If I want to keep the dry point of the gasoline between 170 and 180, how should these two parameters be adjusted? Is there any reference for the specific scope? Hehe, I’m a new employee
Keep the pressure constant; a decrease of around 110 in the top temperature should be sufficient. You can try reducing the temperature and see what happens. Last edited by The wheels roll on on 2007-12-3 09:48.]
It is not practical to lower the dry point of gasoline by increasing pressure; the pressure in the fractionation tower is primarily determined by the compressor pressure and the reaction pressure, and it can only be adjusted by changing the temperature at the top of the tower.
That can’t be right. Only by increasing the vacuum level can the boiling point or dry point temperature be reduced; the specific values can be found in pressure-temperature conversion tables
You haven’t mastered the principles of chemical engineering well; when the composition remains constant, the higher the pressure at the top of the tower, the higher the corresponding bubble point temperature. Therefore, the answer given on the second floor is correct.
To lower the temperature at the top of the tower, one can reduce the temperature of the recirculating stream at that point or increase the volume of this recirculation flow. Another option is to widen the upstream outlet for diesel. Additionally, by using a compressor, it is possible to adjust the pressure at the bottom without affecting the reverse system, thereby increasing the volume of the cold recirculation flow; this way, the specifications for both gasoline and diesel can be maintained