Operation of the butane removal tower in a hydrocracking unit
Thread Content
The debutanizing column of the hydrocracking unit is used to separate liquefied gas from naphtha; the designed top temperature is 78 degrees, the pressure is 1.4 Mp, and the bottom temperature is 150 degrees. To achieve good separation of the two products, what minimum pressure is required to prevent liquefied gas from vaporizing? What is the minimum temperature for the top and bottom temperatures? Thank you
The quality of separation can be determined by analyzing liquefied gas and naphtha; as a standard, the liquefied gas should not contain C5 compounds, while the naphtha should not contain C4 compounds
Personal opinion. Regarding the operation of the hydrodebutanization tower, the parameters such as top temperature, pressure, flow rate, and bottom temperature are all specified in the process package; the operating variables should not differ significantly from those outlined in the package. As the name implies, debutanization involves removing the liquefied gas components from naphtha, and under stable operating conditions, the analysis results serve as the basis for making adjustments. A higher C5 content indicates a higher cut point in the distillation range, which is reflected in the naphtha analysis data as a higher initial boiling point. This is just my humble opinion; I welcome any corrections. Please forgive any mistakes, and thank you!
The current situation is as follows: there is not enough fresh hydrogen available for the hydrogen production process, so the reaction is carried out with a low feed rate. The debutanizing tower cannot receive a continuous feed, and the bottom product of this tower is used to provide heat; due to the small amount of this residue oil, it is hardly recycled, meaning there is no heat source available. As a result, naphtha and liquefied gas do not separate properly. How should the pressure of this butane removal tower be adjusted in this situation? Thank you~
The current situation is as follows: there is not enough fresh hydrogen available for the hydrogen production process, so the reaction is carried out with a low feed rate. The debutanizing tower cannot receive a continuous feed, and the bottom product of this tower is used to provide heat; due to the small amount of this residue oil, it is hardly recycled, meaning there is no heat source available. As a result, naphtha and liquefied gas do not separate properly. How should the pressure of this butane removal tower be adjusted in this situation? Thank you~
This requires detailed calculations based on the specific properties of the materials; it’s not possible to determine it solely based on the experience of those of us in production. Each set of devices is not exactly the same.