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Liquid-Liquid Extraction

THE BEST PARTNER HANBIT SOLTECH

Introduction DSP-834 DSP-835 DFP-644 CID-744

Liquid-Liquid Extraction
Liquid-liquid extraction is a process for separating components in solution by their distribution between two immiscible liquid phases. Tower packings are used in counter-current liquid/liquid contactors with special internals to disperse one of the phases. Selection and arrangement of the internals depends on which phase (light or heavy) is continuous and which is dispersed.
The most common manner of operating an extractor is with the light-phase dispersed. Thus, the interface between phases will be located at the top of the tower above the beds of packing.

In contactors where the light-phase (feed which enters the bottom of the tower) is dispersed, packed beds are supported by the Model DSP-834 disperser/support plate.

In addition to supporting the packing, the plates allow proper dispersion or formation of small droplets which rise through the continuous phase. In breaking the dispersed liquid into small droplets, the Model DSP-834 provides maximum initial contact area between the two phases.

Because the droplets tend to coalesce in the packing, beds are typically limited to a depth of 1.5 to 2.5 m. Multiple beds, each supported by a Model DSP-834, are recommended where a total of more than 2.5 m of packing is required.

In those cases where the heavy-phase is dispersed, a different arrangement of tower internals is necessary. Now the interface between phases will be located at the bottom of the tower below the beds of packing.

When the heavy-phase (feed which enters the top of the tower) is dispersed, the Model DSP-835 disperser plate is used above the top bed.

When multiple beds are required, the Model DSP-835 is also used to support the upper beds without a support plate and collect and redisperse the heavy-phase to the beds below. The bottom bed is supported by a conventional support plate.

The Model DSP-835, although structurally different, is hydraulically upside-down compared to the Model DSP-834. In heavy-phase dispersed contactors, the same bed depth recommendations apply as with light-phase dispersement.


Selecting Liquid/Liquid Devices

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Model Description Phase
DSP-834 Disperser/Support Light dispersed
DSP-835 Disperser/Support Heavy dispersed
DFP-644 Feed Pipe Dispersed (light or heavy)
CID-744 Distributor Continuous (heavy or light)

Model DSP-834

Disperser/Support Plate

The Model DSP-834 disperser/support plate serves two purposes: to support the packed bed and to disperse the light-phase into the continuous heavy-phase. Dump tubes allow the heavy-phase to travel downward through the plate. The light-phase forms a pool under the plate and the orifices generate droplets. The plate design depends on interfacial surface tension, viscosity and differential densities. This plate also acts as a re-disperser in multi-bed towers.

Construction Features :
The plate is supported by a full ledge. Sections are bolted together and all plates up to 835mm ID are clamped to a ledge. Tube restrictor size may vary depending on packing size specified. Standard designs do not require gasketing when ledge surface is in good condition.

Model DSP-835

Disperser/Support Plate

The Model DSP-835 disperses a heavy-phase into the continuous light-phase and in some cases supports the above packed bed. Riser tubes allow the light-phase to pass up through the plate. The heavy-phase forms a head on the top of the plate and orifices generate droplets. The plate design depends on interfacial surface tension, viscosity and differential densities.

Construction Features :
The plate is supported by a full ledge. Sections are clamped to a minor beam and all plates up to 835 mm ID are clamped to the ledge. Tube restrictor size may vary depending on packing size specified. Standard designs do not require gasketing when ledge surface is in good condition.

Model DFP-644

Dispersed-Phase Feed Pipe

The Model DFP-644 feed pipe controls velocity of the dispersed phase flow onto the disperser plate. It is important to prevent excessive turbulence at the phase boundary at the plate. This feed pipe controls feed velocity and correctly positions the discharge points to minimize disturbance. If this requirement is not met, this could lead to maldistribution, loss of dispersion, and premature flooding.

Construction Features :
With the standard design, header pipe attaches to an internal column flange. Header and/or lateral wall clips may be required on larger towers.

Model CID-744

Continuous-Phase Inlet Distributor

The Model CID-744 inlet distributor controls velocity of the continuous phase flow into the tower. Proper control of velocity is important to prevent excessive disturbance of the heavy/light interface, which could lead to carry-over of the dispersed phase. The maximum continuous phase flow should be less than 18.3 m3/hr/m2.

Construction Features :
With the standard design, header pipe attaches to an internal column flange. Header and/or lateral wall clips may be required on larger towers. The orifices on pipe face to packed bed.