Why does a packed tower need a liquid distribution device?

The function of the distributor is to ensure that the liquid phase at the top is evenly distributed over the packing, preventing areas at the edges of the top region from remaining without material.

The purpose of the distribution device is to spread the material flow evenly, preventing the material from entering in a columnar form and causing a serial flow that would prevent the filler from functioning properly.

The function of the filler is to provide a site for gas-liquid contact. If the filler cannot be adequately wetted, it cannot make contact, which means the filler cannot function. Of course, the liquid on the surface of the filler must be uniform. Therefore, a distributor must be used, and it must have good distribution performance. Otherwise, the separation efficiency **decreases**.

The logistics are evenly distributed, and the vapor and liquid phases come into full contact, thereby achieving heat and mass transfer

\"Modern Tower Technology\" (2nd edition), P939: An excessively large packing layer height not only leads to an uneven distribution of the fluid flow rate but also results in an uneven distribution of components across the same cross-section, thereby reducing the separation efficiency of the tower； Or due to the need for intermediate material inlet (outlet), the packing in the diameter-changing tower is also segmented. In addition to ensuring that the liquid phase in the feed distributes evenly downward and the gas phase distributes evenly upward through the packing layer, the liquid redistributor has four other functions: ① mixing the liquid and homogenizing its components across the entire cross-section of the tower ； ②Mixed gas phase, homogenizing the gas components across the entire cross-section of the tower ； ③Guide the liquid from the wall region to the active area of the packing layer to prevent the formation of excessive \"wall flow\" ； ④Redistribution can break up the large ‘streams’ of liquid formed in the packing layer into smaller streams, thereby improving the wetting of the packing layer.

The solution needs to be dispersed; otherwise, only part of the filler will be wet, reducing the mass transfer area and thus lowering efficiency

To ensure a uniform distribution of the liquid phase and full, complete contact between the gas and liquid phases, so as to achieve better mass transfer

Mix the liquid and distribute it evenly across the entire cross-section of the tower

Reply to 6# EdwardLau: Very professional