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 co-current flow process for treating a hydrocarbon with a treating solution, comprising, in combination,
a) feeding a hydrocarbon contaminated with sulfur compounds and an aqueous treating solution to a bottom end of a shroud supported vertically within an interior of a vessel, where the shroud comprises a length defined by a non-porous wall extending from the bottom end to a top end, where a bundle of fibers hangs vertically within the shroud to define a vertical axis, where the hydrocarbon and treating solution form a liquid admixture that contacts the fibers as the liquid admixture flows upward through the shroud parallel to the vertical axis;
b) allowing the liquid admixture to flow the length of the shroud until the liquid admixture enters a bottom section of a disengagement device comprising coalescing material, where the disengagement device is connected to the top end of the shroud surrounding the fibers and extending vertically from the top end of the shroud terminating at a closed cap that forces all the liquid admixture to exit through the coalescing material following a flow path that is tangential to vertical axis;
c) controlling the flow of the liquid admixture through the shroud to effect mass transfer of the sulfur contaminants into the aqueous treating solution to form a spent aqueous treatment solution;
d) coalescing the spent aqueous treating solution as it passes through the disengagement device; and
e) collecting the spent aqueous treating solution in a bottom section of the interior of the vessel; and
f) removing a treated hydrocarbon stream from a top section of the interior of the vessel.
2. The process of claim 1 where the control of the flow of liquid admixture comprises operating the process at or above flooding velocity.
3. The process of claim 1 where the feeding of the hydrocarbon contaminated with sulfur compounds and the aqueous treating solution are supplied through a tray that supports the shroud and directs the liquid admixture into the bottom end of the shroud.
4. The process of claim 1 further comprising continuously removing a portion of the spent treating solution from the column, regenerating the spent treating solution to form a make-up treating solution and returning a portion of the make-up treating solution to the vessel.
5. The process of claim 1 where the sulfur compounds comprise mercaptans and the aqueous treating solution further comprises an aqueous catalyst solution.