In the mass transfer process, evenly distribution of liquid and gas is certain important. If the liquid and gas are not evenly
distributed across the superficial tower area when it enters the packing bed, the liquid-to-gas ratio will be incorrect and the
required separation efficiency will be reduced and even fail. To ensure the intimate contact and high mass transfer efficiency,any cross section In the packed tower should be evenly distributed with gas and liquid. So, the liquid distributor, especially the pre-distributor is priority among priorities.Liquid distributor is an important tower internals in the packed tower, which is installed upper of the packing hold down and
connect with the liquid inlet. The structure of liquid distributor should be reasonable to prevent disturbing hold down device forhigher mass transfer efficiency.
What types of liquid distributor for choice?The liquid distributor has various types according to different standard and using conditions. Overall, it has four types.
* Spray nozzles. Hemispherical spray nozzle will distribute the liquids evenly to the random or structured packing bed. There are numerous small holes in 3–10 mm on the nozzle. It is suitable for the smaller diameter packed tower, which is smaller than 600mm.
* Perforated pipe distributor. Single row or double row perforated pipes will evenly distributed the liquid to the packing bed through perforated holes under the pipe. It is widely used in the medium liquid, reduced pressure distillation towers and wire gauze structured packing towers. It can be made into ladder shapes and ring shapes.
* Through distributor. It has through type and through-pan type, which is widely used in the heavy liquid and gas load, high
viscosity liquid and liquid with suspended solid.
* Orifice distributor. It can be divided into perforated plate type and pan type. The liquid will flow down through perforated
holes or overflow from the annulus between the distributor and the vessel. It is suitable for the small diameter tower, which is smaller than the 800 mm.