Contactor and separation apparatus and process of using same
An improved contactor/separator process is presented where one or more stages of contact and separation is achieved by providing one or more shroud and disengagement device combinations within a vessel, where the disengagement device is connected to the top of the shroud that contains vertically hanging fibers. A liquid admixture of immiscible fluids is directed co-currently upward through the shroud at flooding velocity or greater, where all of the admixture exits the disengagement device through a coalescing material. Tray supports are used to stack additional shroud and disengagement combinations vertically within the vessel. Each tray allows less dense liquids exiting one disengagement device from a lower shroud and disengagement device combination to enter the bottom of a shroud of a shroud and disengagement device combination position vertically above the lower shroud and disengagement device combination.
1. A method of retrofitting an existing unit operation comprising:
selecting a vessel that is part of the existing unit operation, where the vessel has a vertical axis;
removing structural components from within the vessel;
installing a support tray within the vessel;
installing a shroud and disengagement device combination vertically within the vessel parallel to the vertical axis, where the shroud has a length defined by a non-porous wall extending from the bottom end to a top end; and
installing a bundle of fibers within the shroud and the disengagement device such that the bundle of fibers hangs vertically and parallel to the vertical axis,
wherein the disengagement device,
is connected to the top end of the shroud;
has a porous wall that extends vertically from the top end of the shroud; and
has a closed top configured to cause all liquids flowing inside the disengagement device to exit the porous wall following a flow path that is initially tangential to the vertical axis,
wherein the support tray is connected to the shroud such that liquids introduced into the vessel flow vertically upward through the shroud and the disengagement device contacting the fibers.
2. The method of claim 1 , where the disengagement device comprises a coalescer.
3. The method of claim 1 , where at least two shroud and disengagement device combinations are added to the vessel in a vertically stacked configuration such that liquid exiting the lower of the shroud and disengagement device combinations must enter the upper of the other shroud and disengagement device combination.
4. The method of claim 2 where the coalescer comprises a coalescing material that is positioned within into a supporting envelope having one or more openings.
5. The method of claim 4 where the supporting envelope comprises an annulus having inner and outer walls each having one or more openings and the coalescing material is positioned between the inner and outer walls adjacent to the one or more openings.
6. The method of claim 5 where the coalescing material is selected from the group consisting of wire grid, porous metal wall, open-celled sponge, woven wire screen, knitted wire mesh, woven or non-woven fibrous material of metal, polymer resins or combinations of metal and polymer.
7. The method of claim 4 where the coalescing material has an installed density of from about 15 to about 30 lb/ft3.
8. The method of claim 4 where the coalescing material has a volumetric void fraction of from about 90% to about 99%.
9. The method of claim 5 where the one or more openings represent at least a 50% open area of the disengagement device.