What is the difference between an atmospheric tower and a vacuum tower?

Well, of course the tower pressure is different!

The visual differences between atmospheric towers and vacuum towers are not very clear. A vacuum tower is equipped with a vacuum pump to create a vacuum environment, and its structure needs to be able to withstand pressure; therefore it is usually cylindrical in shape. Atmospheric towers are also generally cylindrical, but they can be designed as square if necessary.

The shapes of the atmospheric and vacuum distillation columns in crude oil processing units vary: 1. The atmospheric distillation column is a cylindrical vessel with equal diameters at the top and bottom. 2. The depressurization tower is a cylindrical vessel with a reduced diameter at both the upper and lower ends. This is because the vapor-liquid load at the upper end is low, while at the lower end it is necessary to quickly remove the residue at the bottom of the tower; otherwise, the high-temperature residue would remain there for an extended period and undergo coking reactions.

Normally, there is no difference in appearance

1. The external shapes of atmospheric towers and vacuum towers are not very different; however, their requirements regarding sealing performance vary. 2. It’s just that the usage conditions are different. 3. The feeding methods are different. 4. The extraction methods are different. 5. The discharge method from the tower bottom is different.

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There are differences in the tower structure and packing arrangement. The main difference lies in the operation methods and application areas. Reducing pressure helps to protect the material, lower the boiling point of the target pig manure, and reduce production energy consumption.

Hehe, that’s my specialty. I just wrote the topic; let me copy it for you. 1. The operating range of a packed tower is limited, and it is particularly sensitive to changes in liquid load. When the liquid load is low, the surface of the packing cannot be properly wetted, which leads to a sharp decline in mass transfer efficiency; on the other hand, flooding is likely to occur. However, well-designed plate towers have a wider operating range. 2. Packing towers are not suitable for treating materials that are prone to polymerization or contain solid suspensions, whereas plate towers are suitable for such applications, such as those using large-pore sieve plates or bubble columns. 3. When cooling is required during the gas-liquid contact process to remove reaction heat and dissolution heat, it is easier to install cooling coils on the tray in a plate tower. 4. Packed towers are suitable for smaller-scale applications, while plate towers generally require a size of at least 0.6m; otherwise, installation becomes difficult. 5. For systems prone to foaming, a packed tower is more suitable, as it provides restrictions on foam formation and helps to break it down. 6. Packing towers can handle highly corrosive fluids, such as ceramic packing. 7. Packed towers are often used for thermosensitive systems, as the liquid holdup is lower than that in plate towers, resulting in a shorter residence time of the material inside the tower. 8. Packed towers are more suitable for operation under negative pressure, as the pressure drop is lower than that of plate towers, resulting in less energy consumption.

1. There isn’t much difference in their shape! The diameter at the bottom of the vacuum distillation tower is smaller than that under normal pressure, which reduces the residence time of heavy oil in the tower and prevents coking! ! 2. A vacuum pumping system is connected to the top of the vacuum distillation tower; reducing the pressure helps to lower the boiling point of fractions above 350 degrees below their actual boiling points, thereby increasing the yield of light components! !