What is the impact of excessive cold reflux at the top of the stabilizer tower in the coking absorption stabilization unit, and of low temperatures at the tower top, on liquefied gas C5 and dry gas C3?
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The stabilizer column is a typical distillation column that utilizes the principles of distillation to separate the liquid hydrocarbons in deethanized gasoline from the components of the stabilized gasoline. The key light and heavy components in this process are C4 and C5 respectively; therefore, attention must be paid to the pressure in the stabilizer column
What’s the impact on product quality, dear? ?
The stabilizer column is used to separate liquefied gas from gasoline. The C3 content in the dry gas remains essentially constant. An increase in the cold reflux flow leads to a decrease in the temperature at the top of the column, which improves the distillation efficiency, increases the purity of the liquefied gas, and raises its vapor pressure; the C5 content is reduced or even becomes zero. However, this increases the load on the stripping section. If other parameters remain unchanged, the C4 content in the stabilized gasoline increases, and as a result, its vapor pressure rises as well. Therefore, the reflux flow cannot be too high; an appropriate reflux ratio must be determined based on the actual design of the column in order to enhance the separation efficiency.
The C4 content in stabilized gasoline increases; why does the vapor pressure of stabilized gasoline rise as well? How to understand it
C4 does not belong to the components of gasoline. Moreover, for C4 and C5 within the same category, C4 generates much higher pressure; it’s as if there is a critical point. You can imagine that in normal gasoline components, those with carbon atoms numbered 5 and above are in liquid form, while C4 is in gas form. Therefore, if the level of C4 is too high, the vapor pressure of the gasoline will naturally be unsatisfactory
Thank you for your answer; I finally understand