Issues regarding the adjustment of the dry point and initial boiling point of stabilized gasoline
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We have a 1 million-ton delayed coking unit; under normal conditions, the pressure at the top of the fractionation tower is 120 kPa and the temperature is 120°C. The initial boiling point is 39°C, while the dry point is 230°C. Due to the company’s requirements, we now want to reduce the dry point of the stable steam to below 180°C. The workshop has now arranged to control the pressure at the top of the tower at 130 kPa and the temperature at 110°C. However, it was not ideal; the temperature could be reduced to 192°C at the lowest, but salt deposition clearly occurred at the top of the distillation tower. I would like to ask what the initial boiling point and dry point of your Stable Steam are? How to effectively control dry spots? What is salt crystallization, what factors cause it, and how can this problem be solved? What is the initial boiling point to avoid C5? Thank you all!
Are you referring to crude gasoline from the fractionation tower or stabilized gasoline? The initial distillation point of the stabilized vapor is related to the operation of the stabilizer column; the pressure, reflux ratio, and bottom temperature of this column have a significant impact on it. An increase in the light components at the bottom of the column leads to salt formation in the distillation column, as the temperature rising above a certain level prevents water vapor from escaping, causing water to dissolve salts and lead to salt accumulation on the tray surfaces.