CN111569817B - A filler monomer, a filler component and its application in a liquid-liquid extraction system - Google Patents
A filler monomer, a filler component and its application in a liquid-liquid extraction system Download PDFInfo
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- CN111569817B CN111569817B CN202010518782.3A CN202010518782A CN111569817B CN 111569817 B CN111569817 B CN 111569817B CN 202010518782 A CN202010518782 A CN 202010518782A CN 111569817 B CN111569817 B CN 111569817B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/30—Loose or shaped packing elements, e.g. Raschig rings or Berl saddles, for pouring into the apparatus for mass or heat transfer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D11/00—Solvent extraction
- B01D11/04—Solvent extraction of solutions which are liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D11/00—Solvent extraction
- B01D2011/002—Counter-current extraction
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- Thermal Sciences (AREA)
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- Extraction Or Liquid Replacement (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
本发明公开了一种填料单体，为中空的截顶正八面体结构，由8个正六边形和6个正四边形围绕形成，其中上、下2个正六边形为封闭平面，侧面的6个正四边形和6个正六边形开孔形成十二个流道。本发明还公开了一种填料组件，包括三维网状结构的填料主体，填料主体由若干个所述填料单体排列组合而成，相邻填料单体通过对齐侧面正四边形、侧面正六边形或上下正六边形相互连接，其中上下两个相邻的填料单体由于位于下方的填料单体顶部正六边形封闭而不连通，其余相邻填料单体通过流道相互连通，呈高低错落排列。本发明还提供了所述填料组件在液液萃取体系中的应用。
The present invention discloses a packing monomer, which is a hollow truncated regular octahedron structure, formed by 8 regular hexagons and 6 regular quadrilaterals, wherein the upper and lower two regular hexagons are closed planes, and the 6 regular quadrilaterals and 6 regular hexagons on the side have openings to form twelve flow channels. The present invention also discloses a packing assembly, including a packing body with a three-dimensional mesh structure, the packing body is composed of a plurality of the packing monomers arranged and combined, and adjacent packing monomers are interconnected by aligning the regular quadrilaterals on the side, the regular hexagons on the side, or the upper and lower regular hexagons, wherein the upper and lower adjacent packing monomers are not connected because the regular hexagon on the top of the packing monomer located below is closed, and the remaining adjacent packing monomers are connected to each other through flow channels, and are arranged in a staggered manner. The present invention also provides the use of the packing assembly in a liquid-liquid extraction system.
Description
Technical Field
The invention relates to the technical field of chemical separation, in particular to a filler monomer, a filler assembly and application of the filler monomer and the filler assembly in a liquid-liquid extraction system.
Background
The packed tower is an important liquid-liquid extraction device and has the characteristics of simple structure, convenient installation, high separation efficiency and the like. The packed tower mainly comprises packing, tower internals and a cylinder body, and the packing tower is matched together to achieve the mass transfer separation effect. The packing is the core component in the tower and is a contact place for effective mass and heat transfer between two phases, and the mass transfer performance and the separation efficiency of the packing tower are directly related. The main types of filler currently used in industry include random packing and structured packing.
Random packing is irregularly piled up in the tower, the liquid-liquid contact is more sufficient, the packing mass transfer effect is better, the disadvantage is that the piling-up form is uncontrollable, the adverse conditions such as channeling and collecting walls exist, and the requirement on the distribution of the fluid is higher. Aiming at a high-density difference extraction system, the stepped ring is a common random packing configuration, and due to the orientation effect of the flanging structure, the orientation of packing arrangement is improved, the movement of fluid in the packing is more regular, the resistance is reduced, the flux is increased, and the mass transfer efficiency is improved. Patent CN891091512.1 discloses a flat ring packing with a unique inward-bending arc rib structure, which cancels the flanging of a stepped ring, so that the disperse phase distribution in a tower is more uniform, and the break-aggregation-break of the disperse phase liquid drops in the packing is promoted. Patent CN210229985U discloses a high-efficient reinforced saddle ring packing, which not only has stronger strength, but also has larger specific surface area per se, thereby improving mass transfer efficiency. Patent CN00200232.9 discloses an inward curved arc rib flat ring packing with reinforced zigzag windows, which overcomes the problem of serious axial back mixing of a liquid-liquid extraction system.
Compared with random packing, the structured packing presents regular geometric arrangement, has strong periodicity of fluid movement, lower pressure drop and large mass transfer area. Typical structured packing include grid packing, wire mesh packing, MELLAPACK structured packing, SMVP structured packing, multichannel packing, and the like. The MELLAPACK packing of Sulzer company has the most widely applied, has a staggered multichannel symmetrical structure, can promote dispersion-coalescence-redispersion of liquid phase, and ensures continuous update of mass transfer surface, thereby obtaining higher efficiency and extremely large flux. Patent CN110449113a proposes a high-efficiency structured packing composed of staggered arrangement of oblique-edge packing and straight-edge packing, two-phase flow channels between two adjacent packing layers are more smooth, flow resistance is reduced, wetting area of packing is increased, two-phase contact is more sufficient, and specific surface area of packing is effectively improved. Patent CN210078931U proposes a wave curved surface water conservancy diversion regular packing, and the passageway wall is wave curved surface, and every layer of packing unit is alternately placed with adjacent layer, has improved the anti-clogging ability of packing. Patent CN200610053562.8 discloses a plate ripple regular packing, and the packing is formed by the coincide of multilayer inclined plate ripple, every interval one deck axial water conservancy diversion's plate ripple regular packing layer between two-layer inclined plate ripple regular packing layer, effectively improves two-phase flow characteristic, improves alternate mixing effect.
The extraction packing tower utilizes the density difference or gravity difference of two phases to realize countercurrent flow and mass transfer, and the existing packing configuration mainly aims at the condition that the density difference of the two phases is small (< 200kg/m 3). When the density difference of the liquid-liquid system is large, the heavy phase tends to fall fast, resulting in short contact time of the two phases, difficult high dispersion of the dispersed phase, and poor mass transfer performance. Therefore, it is necessary to design a new-configuration filler suitable for a high-density differential liquid-liquid extraction separation system, and ensure that the dispersed phase in the filler is efficiently dispersed and the two phases are fully contacted.
Disclosure of Invention
Aiming at the defects in the art, the invention provides a filler monomer and a filler component formed by the filler monomer, which are particularly suitable for a liquid-liquid two-phase extraction system, can ensure the efficient dispersion of a disperse phase and the full contact of the liquid phase and the liquid phase, reduce the bad conditions such as short circuit, channeling and the like, and effectively increase the extraction mass transfer efficiency.
A packing monomer is of a hollow truncated regular octahedron structure and is formed by surrounding 8 regular hexagons and 6 regular quadrangles, wherein the upper and lower 2 regular hexagons are closed planes, and twelve flow passages are formed by 6 regular quadrangles on the side face and 6 regular hexagons.
The bottom regular hexagon of the packing monomer can be perforated, and when the packing monomer is piled up to form a packing assembly, the sealing regular hexagon plane at the top of the packing monomer below can be used for realizing separation of the upper packing monomer and the lower packing monomer.
Preferably, the twelve flow channels are uniformly distributed along different side directions, and the cross sections of the flow channels are respectively regular hexagons or regular quadrilaterals.
The invention also provides a filler assembly, which comprises a filler main body with a three-dimensional network structure, wherein the filler main body is formed by arranging and combining a plurality of filler monomers, adjacent filler monomers are connected with each other through an aligned side regular quadrangle, a side regular hexagon or an upper regular hexagon and a lower regular hexagon, wherein the upper adjacent filler monomer and the lower adjacent filler monomer are not communicated due to the sealing of the top regular hexagons of the filler monomers positioned below, and the other adjacent filler monomers are communicated with each other through a runner to form staggered arrangement.
The filler monomers are arranged in an array along three orthogonal directions to form a filler main body with a three-dimensional network structure of regular flow channels. The dividing surfaces between adjacent basic unit bodies are opposite to the dividing surfaces, the holes are opposite to the holes, and the flow channels are oppositely connected with the flow channels.
The filler component has the following two technical effects that 1, filler monomers of a truncated regular octahedron structure can be closely stacked to completely fill a three-dimensional space to form a three-dimensional frame, space waste is avoided, dispersed phases are well dispersed, 2, a horizontal partition plate (a regular hexagon sealing plane on the top of the filler monomers) is arranged in the filler component to increase residence time of the dispersed phases, and the horizontal partition structure in the filler monomers can effectively relieve falling speed of heavy dispersed phases, improve contact area of two phases, prevent short circuit and channeling and enhance mass transfer extraction of the two phases.
Preferably, the packing body is cylindrical.
Preferably, the top and bottom of the packing main body are provided with reinforcing ribs for improving the punching and deformation resistance of the packing main body.
Preferably, the packing assembly further comprises an outer wall which laterally surrounds the packing body, and a plurality of through holes communicated with the flow channels of the packing body are formed in the outer wall. The outer wall is provided with a plurality of through holes which penetrate through the wall surface and are connected with the flow channels in the three-dimensional netlike filler main body, and fluid can enter and exit the filler through the through holes, so that the smooth flow of the fluid is ensured.
The invention also provides application of the packing assembly in a liquid-liquid extraction system.
The fluid flows in the packing during the extraction process, and the packing is provided with channels which meet the distribution and movement of the fluid. In the novel-configuration filler, flow channels are distributed, wherein openings in regular quadrilateral areas in each wrapping surface of a basic unit body (filler monomer) are arranged as fluid channels (flow channels), 6 regular hexagonal planes on the side face are provided with the same openings (preferably regular hexagonal holes are formed in the center of the planes) to form the flow channels, the twelve flow channels are uniformly distributed along different side directions, and finally, the inside of the basic unit body is of a hollow structure, the hollow area is connected with the adjacent basic unit body through twelve flow channels arranged on the periphery, and all the mutually connected basic unit bodies are arranged in a staggered manner.
In the packing assembly, the upper surface and the lower surface of the basic unit body (one surface positioned below can be the top surface of the lower basic unit body connected with the upper surface) are in a closed state, in the extraction process, liquid phases are divided into a plurality of liquid phases in the packing unit body and respectively enter different channels, the upper horizontal partition plate and the lower horizontal partition plate of the basic unit body play a role in fluid blocking, the vertical movement of fluid is reduced, the deflection and the dispersion of fluid are enhanced, the two-phase contact time is prolonged, and the mass transfer efficiency is improved.
Preferably, the density difference of two phases in the liquid-liquid extraction system is not less than 200kg/m 3. The packing assembly of the invention is particularly suitable for high density difference (more than or equal to 200kg/m 3) liquid-liquid extraction systems.
Preferably, the packing assembly has a planar dimension consistent with that of the extraction column, and is installed inside the extraction column singly or in multiple layers. The packing assembly is used in a layer-by-layer superposition mode, and the requirements of any separation height and theoretical separation series can be met.
The height of the filler assembly is preferably 50-1000 mm, and more preferably 100-300 mm.
Compared with the prior art, the invention has the main advantages that a hollow truncated regular octahedron structure is selected as a basic unit body, the three-dimensional space can be effectively filled, a heavy disperse phase enters the high-density liquid-liquid extraction structured packing from top to bottom, and is cut into a plurality of liquid flows in different directions after entering a packing monomer through a channel along with the flow of the heavy disperse phase, so that the disperse phase is well dispersed in space, the uniformity of liquid flow distribution in the packing is improved, the horizontal separation structure plays a role of buffering the heavy disperse phase, the disperse phase is converged in the packing unit, the dropping speed is reduced, the two-phase contact time is increased, the retention dispersion is increased, and the mass transfer efficiency is improved.
Drawings
FIG. 1 is a schematic perspective view of a filler monomer of an embodiment;
FIG. 2 is a schematic perspective view of a packing assembly of an embodiment;
FIG. 3 is a schematic view of a partially enlarged structure of a packing assembly of an embodiment;
FIG. 4 is a schematic flow diagram of a packing assembly constructed from packing monomers of an embodiment;
In the figure: the sealing device comprises a sealing plane of 11-regular hexagon, a fluid channel of 12-regular hexagon, a fluid channel of 13-regular hexagon, a side packing of 14-packing monomer, a packing body of 1-packing, a reinforcing rib of 2-and an outer wall of 3-.
Detailed Description
The invention will be further elucidated with reference to the drawings and to specific embodiments. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. The methods of operation, under which specific conditions are not noted in the examples below, are generally in accordance with conventional conditions, or in accordance with the conditions recommended by the manufacturer.
Examples
As shown in fig. 1, the packing monomer used in this embodiment is a hollow truncated regular octahedron structure, and is formed by surrounding 8 regular hexagons and 6 regular quadrangles, wherein the upper and lower 2 are regular hexagonal enclosed planes 11 (packing monomer horizontal separation structure), and the 6 regular quadrangles and 6 regular hexagonal openings on the side face form twelve flow channels, namely 6 regular quadrangle fluid channels 12 and 6 regular hexagon fluid channels 13. The twelve flow channels are evenly distributed along different side directions. Specifically, the thickness of the side wall of the packing monomer is 0.5mm, the regular hexagon sealing plane 11 and the regular quadrilateral fluid channel 12 are equal to 4mm in edge length R of the side packing 14, the regular hexagon fluid channel 13 is provided with a regular hexagon hole in the center of the side packing 14, and the length L of the opening edge is 2.8mm.
The flow of assembling the packing monomers to form the packing assembly is shown in fig. 4, a plurality of packing monomers are combined and are arranged in an array along three orthogonal directions, so that the packing assembly is suitable for a cylindrical extraction tower, the obtained cuboid structure is cut and stretched to form a cylindrical packing main body with a three-dimensional network structure with regular flow channels, then the side surface of the cylindrical packing main body surrounds the cylindrical outer wall and is fused with the wall surface of the cylinder, and the radial size of the packing assembly is consistent with the inner diameter of the extraction tower. The cylinder body wall is provided with a plurality of through holes which penetrate through the wall and are connected with the flow channels in the three-dimensional reticular filler main body, and fluid can enter and exit the filler through the through holes, so that the smooth flow of the fluid is ensured. The filler main body is formed by arranging and combining a plurality of filler monomers, adjacent filler monomers are connected with each other through regular quadrangles on the aligned side surfaces, regular hexagons on the side surfaces or regular hexagons on the upper and lower sides, wherein the upper and lower adjacent filler monomers are not communicated due to the sealing of the regular hexagons on the top of the filler monomer positioned below, and the rest adjacent filler monomers are communicated with each other through flow channels to form staggered arrangement.
The obtained packing assembly comprises an inner cylindrical packing body 1 and a cylindrical outer wall 3 surrounding the packing body 1, as shown in fig. 2 and 3, wherein a plurality of through holes are formed in the outer wall 3. The top and bottom of the packing body 1 are provided with reinforcing ribs 3 for improving the punching and deformation resistance of the packing body. Specifically, the thickness of the outer wall 3 is 1mm, the thickness of the reinforcing ribs is 2mm, and the distance along which vertical stretching is performed along the upper and lower surfaces of the filler body 1 is 2mm.
The packing assembly of the embodiment is suitable for a high-density difference liquid-liquid two-phase extraction process. Two fluid channels are respectively formed in the filler, namely regular quadrangles and regular hexagons, and the flow channels of adjacent filler monomers are communicated, so that the liquid phase flow is smoother, the flow resistance of the liquid phase flow is reduced, the filler has the advantages of high flux, low pressure drop and the like, and the filler monomers are horizontally separated to cause the heavy liquid phase flow to be resistant, so that the buffer effect is achieved, the two-phase contact time is increased, and the mass transfer effect is enhanced.
The water-tetrabromoethane two-phase high density difference extraction process is taken as an implementation object, and the density ratio of water to tetrabromoethane is 1:3. With the packing assembly of this example, the tetrabromoethane phase was added from the upper portion of the packing, the aqueous phase was added from the lower portion of the packing, the flow rate of the tetrabromoethane phase was 1 liter/(hr cm 2), the flow rate of the aqueous phase was 1 liter/(hr cm 2), the tetrabromoethane phase was a dispersed phase, the aqueous phase was a continuous phase, and sufficient contact was achieved between the two phases after passing through the packing, and the parameters of the relevant liquid-liquid dispersion were as shown in table 1.
TABLE 1 critical liquid-liquid dispersion data for the packing elements of the examples under a water-tetrabromoethane extraction system
Comparative example 1
The comparative example uses the pall ring random packing material commonly used in industry, wherein the pall ring packing material filling mode and related parameters are listed in table 2. The data relating to the liquid-liquid dispersion for the water-tetrabromoethane extraction system given in the above example under the same flow rate and feed mode conditions are shown in table 3.
Table 2 pall ring packing geometry data
TABLE 3 critical liquid-liquid dispersion data for pall ring random packing under water-tetrabromoethane extraction System
Comparative example 1 has a faster flow rate and a lower content of the dispersed phase, and the contact area of the two phases is reduced more although the size of the dispersed droplets is reduced as compared with the above-described example. Comparison shows that the packing configuration given in the examples is a better extraction packing.
Comparative example 2
The comparative examples used the commercially available structured packing of horizontal corrugated plates, the structural dimensions of which are shown in Table 4. The liquid-liquid dispersion data for the water-tetrabromoethane extraction system given in the above example are presented in table 5 at the same flow rate and feed mode.
Table 4 geometrical characteristics data of structured packing of horizontal corrugated plates
| Peak height mm | Peak width mm | Thickness of plate is mm | Corrugated apex angle | Diameter of small hole mm | Opening ratio of |
| 6 | 12 | 1 | 90° | 1.2 | 10.10% |
TABLE 5 critical liquid-liquid dispersion data for structured packing of horizontal corrugated plate under water-tetrabromoethane extraction System
Comparative example 2 compared with the above examples, the flow rate of the dispersed phase was faster, the content was lower, and the size of the dispersed droplets was larger, and the contact area of the two phases was more reduced. Comparison shows that the packing configuration given in the examples is a better extraction packing.
Further, it is to be understood that various changes and modifications of the present application may be made by those skilled in the art after reading the above description of the application, and that such equivalents are intended to fall within the scope of the application as defined in the appended claims.
Claims (8)
1. The application of the filler assembly in the liquid-liquid extraction system is characterized in that the filler assembly comprises a filler main body of a three-dimensional network structure, the filler main body is formed by arranging and combining a plurality of filler monomers, the filler monomers are of a hollow truncated regular octahedron structure and are formed by surrounding 8 regular hexagons and 6 regular quadrangles, wherein the upper and lower 2 regular hexagons are closed planes, the 6 regular quadrangles on the side face and the 6 regular hexagons are provided with holes to form twelve flow passages, adjacent filler monomers are connected with each other through the aligned side regular quadrangles, the side face regular hexagons or the upper and lower regular hexagons, the upper and lower adjacent filler monomers are not communicated due to the sealing of the top regular hexagons of the filler monomers positioned below, and the rest adjacent filler monomers are communicated with each other through the flow passages to form staggered arrangement.
2. Use according to claim 1, characterized in that the filler monomer is provided with regular hexagonal openings at the bottom.
3. The use according to claim 1, wherein the twelve flow channels are uniformly distributed along different side directions, and the flow channel sections are respectively regular hexagons or regular quadrilaterals.
4. The use according to claim 1, wherein the filler body is cylindrical.
5. The use according to claim 1, wherein the top and bottom of the filler body are provided with reinforcing ribs for improving the resistance of the filler body to stamping and deformation.
6. The use according to any one of claims 1 to 5, wherein the packing assembly further comprises an outer wall laterally surrounding the packing body, and the outer wall is provided with a plurality of through holes communicating with the flow passage of the packing body.
7. The use according to claim 1, wherein the two-phase density difference in the liquid-liquid extraction system is not less than 200kg/m 3.
8. The use according to claim 1 or 7, wherein the packing elements have a planar size corresponding to the size of the extraction column, are individually or multiply installed inside the extraction column and are in close fit with the inner wall of the extraction column;
The height of the packing component is 50-1000 mm.
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| CN120714268B (en) * | 2025-08-29 | 2025-11-11 | 中国科学院过程工程研究所 | Extraction module and filler extraction tower |
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| CN212915688U (en) * | 2020-06-09 | 2021-04-09 | 浙江大学 | A filler monomer and filler assembly |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5993602U (en) * | 1982-12-08 | 1984-06-25 | 日本碍子株式会社 | Filling for fluid contact |
| SU1542564A1 (en) * | 1988-05-03 | 1990-02-15 | Институт химии и технологии редких элементов и минерального сырья Кольского филиала им.С.М.Кирова АН СССР | Attachment for pulsating and vibrating heat- and mass-exchange apparatus |
| US5901575A (en) * | 1997-08-25 | 1999-05-11 | Air Products And Chemicals, Inc. | Stackable structured packing with controlled symmetry |
| US6387534B1 (en) * | 2000-11-14 | 2002-05-14 | Saint-Gobain Norpro Corporation | Random packing element |
| CN2902447Y (en) * | 2006-03-10 | 2007-05-23 | 尹贺军 | Square shaped regular filler |
| CN206613502U (en) * | 2017-04-14 | 2017-11-07 | 宁夏大学 | A kind of filler and reaction tower |
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| CN212915688U (en) * | 2020-06-09 | 2021-04-09 | 浙江大学 | A filler monomer and filler assembly |
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