Device for controlling interface of liquid-liquid extraction column using pressure equilibrium

Abstract

Disclosed is a device for controlling an interface of a liquid-liquid extraction column using pressure equilibrium. The device includes a vertical pipe provided beside an extraction column parallel thereto. The device enables internal pressures of the extraction column and the vertical pipe to be balanced with each other by moving fluid from the extraction column into the vertical pipe. Therefore, the device can maintain the level of an interface between fluids having different specific gravities with a simple control system. The device includes the liquid-liquid extraction column having a column body; and upper and lower tanks having respective inlet pipes and respective outlet pipes, wherein a pipeline is connected to the outlet pipe of the lower tank, and the internal pressures are balanced by controlling a level of the fluid in the pipeline, thereby maintaining the level of the interface.

Claims

1. A device for controlling an interface of a liquid-liquid extraction column, the device comprising: the liquid-liquid extraction column including: a column body; and an upper tank and a lower tank respectively provided at an upper end and a lower end of the column body, the upper tank and the lower tank having respective inlet pipes and respective outlet pipes through which fluids having different specific gravities are introduced and discharged, wherein a pipeline is connected to the outlet pipe of the lower tank and the fluid discharged from the lower tank is raised through the pipeline, and an internal pressure of the extraction column and an internal pressure of the pipeline are balanced with each other by controlling a level of the fluid raised in the pipeline, thereby steadily maintaining a level of an interface between the fluids having different specific gravities in the upper tank: wherein the pipeline comprises a vertical pipe connected to the outlet pipe of the lower tank and extending vertically in parallel to the extraction column, an outlet drain provided next to the vertical pipe at the same height as the vertical pipe and a plurality of pressure control pipes that branch from the vertical pipe to the outlet drain, with an on/off valve provided at each of the plurality of pressure control pipes to switch on/off the plurality of pressure control pipes, respectively.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a schematic view showing a conventional liquid-liquid extraction column; and

(2) FIG. 2 is a schematic view showing a device for controlling an interface of a liquid-liquid extraction column using pressure equilibrium according to an exemplary embodiment of the present invention.

DETAILED DESCRIPTION

(3) All terms or words used in the specification and claims have the same meaning as commonly understood by one of ordinary skill in the art to which inventive concepts belong. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

(4) Hereinafter, a device for controlling an interface of a liquid-liquid extraction column using pressure equilibrium according to an exemplary embodiment of the present invention will be described in reference with FIG. 2.

(5) Prior to the description, the same reference numerals as those of the related art are assigned to the same elements.

(6) The device for controlling the interface of the liquid-liquid extraction column using pressure equilibrium includes a vertical pipe that may obtain pressure equilibrium between the internal pressure of the vertical pipe and the internal pressure of the extraction column. Therefore, the device may steadily maintain a level of an interface between fluids having different specific gravities in an upper tank through which the fluids are introduced and discharged.

(7) Therefore, the interface may be maintained by a simple control system and thus, the interface may be easily maintained, thereby reducing the demand for maintenance.

(8) The device for controlling the interface of the liquid-liquid extraction column using pressure equilibrium includes a column body 10, an upper tank 20, a lower tank 30, a vertical pipe 100, a pressure control pipe 200, and an on/off valve 300.

(9) First, the column body 10 connects the upper tank 20 and the lower tank 30, and is provided to be vertical to a ground surface.

(10) In the column body 10, the fluids respectively introduced through the upper tank 20 and the lower tank 30 are mixed, and the mixture is separated in a vertical direction by the different specific gravities of the fluids.

(11) The column body 10 may be one column body, or may be a combination of a plurality of column bodies that branch from the column body in a row.

(12) Second, the upper tank 20 is a unit that a fluid (fluid A) having high specific gravity is introduced into, and that a fluid (fluid B) having low specific gravity is discharged from. The upper tank is provided at the upper end of the column body 10.

(13) Here, an upper inlet pipe 21 and an upper outlet pipe 22 are respectively provided at one side and another side of the upper tank 20.

(14) Third, the lower tank 30 is a unit that the fluid (fluid B) having low specific gravity is introduced into, and that the fluid (fluid A) having high specific gravity is discharged from. The lower tank is provided at the lower end of the column body 10.

(15) Here, a lower inlet pipe 31 and a lower outlet pipe 32 are respectively provided at one side and another side of the lower tank 30.

(16) Fourth, the vertical pipe 100 forms a pipeline through which the fluid discharged from the lower tank 30 via the lower outlet pipe 32 passes. By using the pressure of the fluid, the internal pressure of the extraction column 1 and the internal pressure of the vertical pipe are balanced with each other.

(17) The vertical pipe 100 is provided beside the extraction column 1, and extends vertically in parallel to the extraction column 1.

(18) The internal pressure of the vertical pipe 100 is generated by moving the fluid discharged from the lower tank 30 into the vertical pipe 100, thereby steadily maintaining the level of the interface between the fluids having different specific gravities in the upper tank 20.

(19) Fifth, the pressure control pipe 200 controls the internal pressure of the vertical pipe 100 in stages, the internal pressure of the vertical pipe generated by the fluid raised in the vertical pipe 100. Therefore, the internal pressure of the extraction column 1 and the internal pressure of the vertical pipe are balanced with each other.

(20) That is, when the internal pressure of the extraction column 1 is determined, it is required to control the internal pressure of the vertical pipe 100 equal to the internal pressure of the extraction column. The level of the fluid introduced into the vertical pipe 100 is controlled by opening and closing the pressure control pipe 200, thereby controlling the internal pressure of the vertical pipe 100.

(21) Here, the pressure control pipe 200 is a plurality of the pressure control pipes in a height direction of the vertical pipe 100.

(22) Here, the pressure control pipes 200 are provided at different heights, and are parallel to each other as shown in FIG. 2.

(23) Sixth, the on/off valve 300 opens and closes the pressure control pipes 200, and is provided at each of the pressure control pipes 200.

(24) That is, the on/off valve 300 opens and closes each of the pressure control pipes 200 such that the level of the fluid in the vertical pipe 100 is controlled.

(25) In the meantime, an outlet drain 400 is provided at an end of each of the pressure control pipes 200 to combine the pressure control pipes 200.

(26) That is, the fluid discharged through the opened pressure control pipes 200 moves to a predetermined position via the outlet drain 400.

(27) Hereinafter, operation of the device for controlling the interface of the liquid-liquid extraction column using pressure equilibrium having the above-described configuration will be described.

(28) First, the internal pressure of the extraction column that the fluid is introduced into is calculated, and the process of calculating the internal pressure of the extraction column will be described as follow.

(29) Except for external force such as pulsation, etc., the internal pressure of the extraction column 1 is only related to density of and a total level of the fluids in the extraction column 1.

(30) In an equilibrium state, a total level of the fluids in the extraction column is fixed to the level of the upper outlet pipe 22 of the upper tank 20. Therefore, the internal pressure of the extraction column 1 is determined by total density of the fluids in the extraction column 1.

(31) Two fluids having different densities are in the extraction column. An inflow rate and an outflow rate of each of the fluids are steadily maintained. Therefore, the total density of the fluids in the column body 10 is determined based on a ratio of flow rate.

(32) Therefore, the total density of the fluids in the extraction column 1 is determined by a ratio of presence of the fluids in the upper tank 20, namely, the level of the interface.

(33) As described above, when the internal pressure of the extraction column is calculated at the time of the interface located at a desired level in the upper tank 20, the level of the fluid in the vertical pipe 100 is derived based on a range of the calculated internal pressure.

(34) Next, when the level of the fluid in the vertical pipe 100 is derived, the on/off valve 300 of the pressure control pipes 200 is correspondingly opened.

(35) Therefore, the level of the fluid introduced into the vertical pipe 100 from the lower tank 30 of the extraction column 1 is maintained at a position lower than the opened on/off valve of the pressure control pipes 200.

(36) Consequently, the internal pressure of the extraction column 1 and the internal pressure of the vertical pipe 100 are balanced with each other. In addition, the level of the interface between the fluids in the upper tank 20 is maintained at a level for the balance.

(37) In the meantime, the internal pressure of the extraction column 1 may be variable due to different densities of the two fluids introduced into the extraction column 1, or due to an external condition.

(38) Here, the internal pressure of the extraction column 1 and the internal pressure of the vertical pipe are balanced with each other by controlling the opening of the pressure control pipes 200 provided at different heights in the vertical pipe 100.

(39) As described up to now, the device for controlling the interface of the liquid-liquid extraction column using pressure equilibrium includes the vertical pipe provided beside the extraction column. The device can control the level of the interface between the two fluids in the upper tank of the extraction column by artificially enabling the internal pressure of the extraction column and the internal pressure of the vertical pipe to be balanced with each other.

(40) Therefore, the interface can be steadily maintained by the simple control system, and the demand for maintenance can be reduced, thereby enhancing efficiency for the interface level maintaining work.

(41) While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes and modifications may be made therein without departing from the technical idea and scope of the present invention and such changes and modifications belong to the claims of the present invention.

(42) All references, including publications, patent applications, and patents cited herein are hereby incorporated by reference to the same extent as if each reference were individually and specifically indicated to be incorporated by reference and were set forth in its entirety herein.

(43) The use of the terms a and an and the and similar referents in the context of describing the invention (especially in the context of the following claims) is to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. The terms comprising, having, including, and containing are to be construed as open-ended terms (i.e., meaning including, but not limited to,) unless otherwise noted. Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., such as) provided herein, is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention unless otherwise claimed. No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the invention.

(44) Preferred embodiments of this invention are described herein, including the best mode known to the inventors for carrying out the invention. Variations of those preferred embodiments may become apparent to those of ordinary skill in the art upon reading the foregoing description. The inventors expect skilled artisans to employ such variations as appropriate, and the inventors intend for the invention to be practiced otherwise than as specifically described herein. Accordingly, this invention includes all modifications and equivalents of the subject matter recited in the claims appended hereto as permitted by applicable law. Moreover, any combination of the above-described elements in all possible variations thereof is encompassed by the invention unless otherwise indicated herein or otherwise clearly contradicted by context.