Extraction tower liquid-liquid distributor for separating acetic acid from water

Abstract

The utility model relates to the technical field of chemical separation, in particular to an extraction tower liquid-liquid distributor for separating acetic acid from water, which comprises an extraction tower, a collecting tray is arranged in the extraction tower, a raw material feeding channel is arranged at the upper end of the extraction tower, an extraction feeding channel is arranged at the lower end of the extraction tower, and a discharging channel is arranged at the top of the extraction tower. Each collecting disc comprises a bottom disc, a conical pipe and a baffle plate, the bottom disc comprises an inner disc and an outer disc, and through the multiple layers of collecting discs, 20-50 through holes in the baffle plate and 4 circles of through holes in the inner wall of the conical groove (20-50 through holes in each circle), uniform distribution of liquid on the whole tower section is ensured, the local overload or dead zone phenomenon is avoided, and the service life of the tower is prolonged. Due to the design of the conical expansion cover, not only is the liquid contact area enlarged, but also the possibility that the liquid directly impacts the tower wall is reduced, the energy loss is reduced, and stable operation conditions in the tower are favorably maintained.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of chemical separation technology, specifically to an extraction column liquid-liquid distributor for separating acetic acid and water. BACKGROUND

[0002] In the field of chemical separation, extraction as a key unit operation is widely used to precisely extract target components from mixtures. In particular, when dealing with mutually soluble liquid systems such as acetic acid and water, traditional separation methods such as distillation are often limited due to high energy consumption and poor separation effect. Therefore, the development of efficient and energy-saving separation technology has become an urgent need in the industry. Liquid-liquid extraction technology, with its high efficiency and flexibility, has shown significant advantages in dealing with such difficult separation systems.

[0003] However, the existing extraction column and its internal liquid-liquid distributor still face a series of technical challenges:

[0004] Uneven liquid distribution:

[0005] The distributor in the traditional extraction column mostly adopts a single-layer structure or a simple perforated plate design. This design often leads to uneven distribution of liquid after entering the extraction column, forming local overload or dead zones, which seriously affects the interfacial contact efficiency and extraction effect.

[0006] High flow resistance:

[0007] Due to design limitations, the traditional distributor generates a large flow resistance when working. This not only increases the operation difficulty, but also significantly increases the energy consumption, threatening the continuity and stability of the extraction process.

[0008] Excessive tower height occupation:

[0009] In order to ensure sufficient contact time and separation effect, the traditional extraction column usually needs to maintain a high tower. This not only increases the cost of equipment manufacturing and installation, but also puts higher requirements on the spatial layout of the production site, limiting the widespread application of extraction technology.

[0010] Light and heavy components retention:

[0011] The design of some traditional distributors allows light and heavy components to easily accumulate on the surface of the distributor. This accumulation not only affects the separation efficiency, but also can lead to a decrease in product quality, causing many inconveniences in subsequent processing. INVENTION CONTENTS

[0012] (I) Technical problems solved

[0013] In view of the deficiencies of the prior art, the utility model provides an extraction column liquid-liquid distributor for separating acetic acid and water.

[0014] (II) Technical Solution

[0015] To achieve the above object, the utility model provides the following technical scheme: a kind of extraction column liquid-liquid distributor for acetic acid and water separation of the utility model, including extraction column, the inside of the extraction column is equipped with collection tray, the upper end of the extraction column is equipped with raw material feeding channel, the lower end of the extraction column is equipped with extraction feeding channel, the top of the extraction column is equipped with discharge channel, the collection tray includes bottom disc, conical tube and baffle, the bottom disc includes inner disc and outer disc, conical groove is equipped between the outer disc and inner disc, conical hole is equipped on the inner disc, the conical tube is installed in the inside of inner disc, the side of the baffle is equipped with edge frame, the edge frame is installed on inner disc by bolt, and the baffle is located above the conical tube, a plurality of through holes one are circumferentially provided on the baffle, a plurality of through holes two are circumferentially provided on the inner wall of conical groove.

[0016] Preferably, the collection tray is provided with at least two layers in the extraction column.

[0017] Further preferably, the side of the baffle is provided with a conical expansion cover.

[0018] More preferably, the through holes one are circumferentially provided on the baffle in a number of 20-50.

[0019] Preferably, the through holes two are located on the inner disc, and the through holes two are provided in four circles from the bottom side of the conical groove upward, and the number of the through holes two is 20-50.

[0020] Further preferably, the extraction column is provided with a filler layer one, a filler layer two and a filler layer three, the filler layer one is located at the bottom end of the extraction column, and the filler layer one is communicated with the extraction feeding channel, the filler layer three is located at the top end of the extraction column, and the filler layer three is communicated with the raw material feeding channel, and the filler layer two is located between the two collection trays.

[0021] More preferably, the bottom of the extraction column is provided with a drainage channel.

[0022] (III) Beneficial Effects

[0023] Compared with the prior art, the utility model provides an extraction column liquid-liquid distributor for acetic acid and water separation, which has the following beneficial effects:

[0024] Low resistance and high efficiency distribution

[0025] Uniform liquid distribution: through the through holes one (20-50) on the baffle and the through holes two (20-50 per circle, a total of 4 circles) on the inner wall of the conical groove of the multi-layer collection tray, the uniform distribution of liquid on the entire column cross section is ensured, and the local overload or dead zone phenomenon is avoided.

[0026] Reduced flow resistance: The conical design not only expands the liquid contact area but also reduces the likelihood of liquid directly impacting the tower wall, reducing energy loss and helping to maintain stable operating conditions within the tower.

[0027] Compact design saves space

[0028] Reduced tower height: Due to the conical design, the overall height is lower, occupying a smaller height of the extraction tower, reducing the tower investment cost. When processing acetic acid and water raw materials, compared with plate extraction tower, the tower height can be reduced by 15%-30%, the investment is smaller; compared with ordinary packing extraction tower, the distributor has smaller resistance and occupies smaller space, and the extraction tower height is reduced by 8-12%.

[0029] Reduced floor area: The compact design reduces the installation space required by the entire system, adapts to more site conditions, and improves the flexibility of equipment arrangement.

[0030] Improved separation efficiency

[0031] Increased contact time and opportunity: The multi-layer collection disc design increases the residence time and contact opportunity of the liquid in the tower, thereby improving the separation effect. Each layer of collection disc can independently redistribute the liquid, reducing the unevenness caused by single-point feeding.

[0032] Enhanced mass exchange effect: The three-layer packing design ensures that the liquid has sufficient contact time during the entire extraction process, especially in the second packing layer between the two collection discs, further enhancing the mass exchange effect and improving the overall separation efficiency.

[0033] Prevent light and heavy components from being retained

[0034] Optimized liquid flow path: The large conical hole in the middle is a channel for the extractant, with baffles on top to collect the large-density raffinate phase flowing down from above and disperse it into the surrounding conical grooves. The baffles have 20-50 small holes evenly distributed on them, reducing the resistance of the extractant rising and ensuring uniform distribution of the liquid.

[0035] Reduced dead angles and accumulation: The conical groove hole design allows the raffinate phase wastewater to pass through smoothly and minimizes resistance, preventing light and heavy components from being retained on the surface of the distributor, affecting the continuity and stability of the subsequent separation process. BRIEF DESCRIPTION OF DRAWINGS

[0036] Fig. 1 It is a schematic diagram of the overall structure of the utility model;

[0037] Fig. 2 It is a schematic diagram of the top view structure of the collection disc of the utility model;

[0038] Fig. 3 It is a schematic diagram of the bottom view structure of the collection disc of the utility model;

[0039] In the diagram: 1. Collection tray; 2. Conical tube; 3. Baffle; 4. Conical hood; 5. Conical hole; 6. Side frame; 7. Conical groove; 8. Through hole two; 9. Through hole one; 10. Outer plate; 11. Inner plate; 12. Extraction tower; 13. Packing layer one; 14. Packing layer two; 15. Packing layer three; 16. Extraction feed channel; 17. Raw material feed channel; 18. Discharge channel; 19. Drainage channel; 20. Base plate. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] Please see Figs. 1-3 This utility model discloses a liquid-liquid distributor for an extraction tower used for separating acetic acid and water. The extraction tower 12 includes an extraction tower 12 with a collection tray 1 inside. The upper end of the extraction tower 12 has a raw material feed channel 17, the lower end has an extraction feed channel 16, and the top of the extraction tower 12 has a discharge channel 18. The collection tray 1 includes a base plate 20, a conical tube 2, and a baffle 3. The base plate 20 includes an inner plate 11 and an outer plate 10. A conical groove 7 is provided between the outer plate 10 and the inner plate 11. The inner plate 11 has conical holes 5. The conical tube 2 is installed inside the inner plate 11. A side frame 6 is provided on the side of the baffle 3, and the side frame 6 is bolted to the inner plate 11. The baffle 3 is located above the conical tube 2. A plurality of through holes 9 are arranged around the baffle 3, and a plurality of through holes 8 are arranged around the inner wall of the conical groove 7.

[0042] The basic structure and working principle of the liquid-liquid distributor of the extraction tower 12 used for acetic acid and water separation.

[0043] Extraction Tower 12 Design:

[0044] Structural Overview: The system mainly includes an extraction tower 12, which has at least two layers of collection trays 1 inside to achieve effective liquid distribution within the tower. The extraction tower 12 has a discharge channel 18 at the top and a drainage channel 19 at the bottom, and raw material feed channels 17 and extraction feed channels 16 at different heights of the tower.

[0045] Collection disk 1 component:

[0046] Chassis 20: Composed of inner disc 11 and outer disc 10, with a conical groove 7 formed between them. The inner disc 11 has a conical hole 5 to facilitate the flow of liquid into the conical tube 2.

[0047] Tapered tube 2: Installed inside the inner plate 11, serving as a preliminary collection and guiding component for the liquid.

[0048] Baffle 3: Located above the tapered tube 2, and fixed to the inner plate 11 by the side frame 6. Several through holes 9 (20-50) are arranged around the baffle 3 to disperse the incoming liquid flow.

[0049] Conical diffuser 4: Located on the side of baffle 3, it helps to further guide and diffuse the liquid flow, reducing turbulence and local overload.

[0050] Through-hole 2 8: Located on the inner wall of the conical groove 7, it is opened in 4 rings from bottom to top, with 20-50 holes in each ring, to ensure that the liquid is evenly distributed in the tower.

[0051] Packing layer layout:

[0052] Three-layer packing: The extraction tower 12 is equipped with packing layer 13, packing layer 2 14 and packing layer 3 15, which are located at the bottom, middle and top of the tower respectively, increasing the liquid contact area and promoting the efficiency of mass exchange.

[0053] Detailed Workflow

[0054] Feeding stage:

[0055] The raw material (a mixture of acetic acid and water) enters the extraction tower through the raw material feed channel 17 located at the top of the extraction tower 12.

[0056] The extractant is introduced through the extraction feed channel 16 located at the lower end of the extraction tower 12 and flows in the opposite direction to meet the raw material.

[0057] Distribution and mixing stages:

[0058] The liquid first comes into contact with the bottom collection tray 1, is initially dispersed through the through hole 9 on the baffle 3, and then falls into the conical tube 2.

[0059] The central conical hole 5 serves as an extractant channel, with a baffle 3 on top to collect the high-density raffinate flowing down from above and disperse it into the surrounding conical groove 7.

[0060] Subsequently, the liquid flows along the conical groove 7 and is dispersed again to a wider area through the through hole 8, ensuring a uniform distribution of the liquid across the entire tower cross section.

[0061] During this process, the liquid passes through each packing layer and comes into full contact with the countercurrent extractant, resulting in a phase-to-phase mass transfer process that achieves effective separation of acetic acid and water.

[0062] Collection and discharge phases:

[0063] The separated lighter phase (such as acetic acid containing less water) moves upward and is eventually discharged from the discharge channel 18 at the top of the tower.

[0064] The heavy phase (such as the water-rich portion) flows downwards and is discharged through the drainage channel 19 at the bottom of the tower after passing through the packing layer.

[0065] The specific working principles of each optimized technical solution

[0066] Multi-layer collection tray 1 design: By setting at least two layers of collection trays 1, the residence time and contact opportunities of the liquid in the column can be increased, thereby improving the separation effect. Each layer of collection tray 1 can independently redistribute the liquid, reducing the non-uniformity caused by single-point feeding.

[0067] The function of the conical expansion shroud 4 is to not only increase the contact area of ​​the liquid, but also reduce the possibility of the liquid directly impacting the tower wall, reduce energy loss, and help maintain stable operating conditions inside the tower.

[0068] Optimization of the number of through holes: Reasonably configure the through holes 9 (20-50) on the baffle 3 and the through holes 8 (20-50 per ring, 4 rings in total) on the inner wall of the conical groove 7, so that the liquid can be more evenly distributed in the tower and avoid dead corners or local accumulation.

[0069] Packing layer layout: The three-layer packing design ensures that the liquid has sufficient contact time throughout the extraction process. In particular, the packing layer 2 14 between the two collection plates 1 further enhances the mass exchange effect and improves the overall separation efficiency.

[0070] The central conical orifice design: The large central conical orifice 5 serves as the extractant channel, with a baffle 3 on top. The purpose of the baffle 3 is to collect the high-density raffinate flowing down from above and disperse the raffinate into the surrounding conical grooves 7. The baffle 3 has 20-50 small holes evenly distributed on it to reduce the resistance to the upward movement of the extractant and ensure uniform liquid distribution.

[0071] Conical groove 7 small hole design: There is a conical groove 7 between the large hole in the middle and the tower wall. Four small holes are opened from top to bottom on the inner side and bottom side of the conical groove 7, with 20-50 holes in total, to facilitate the passage of residual wastewater and minimize resistance.

[0072] Valves can be installed on the extraction raw material feed channel 17, the raw material feed channel 17, the discharge channel 18, and the drainage channel 19 in this technical solution.

[0073] Summary of advantages

[0074] Low resistance and efficient distribution: Compared with the traditional collection plate 1, the new collection plate 1 has lower resistance and better distribution effect, with almost no light and heavy components remaining, thus improving separation efficiency.

[0075] Compact design saves space: Due to the conical design, the overall height is low, occupying less height in the extraction tower 12, thus reducing the investment cost of the tower. When processing acetic acid and water feedstocks, compared with plate extraction tower 12, the tower height can be reduced by 15%-30%, resulting in lower investment; compared with ordinary packed extraction tower 12, this collection tray 1 has lower resistance, occupies less space, and the height of extraction tower 12 is reduced by 8-12%.

[0076] In summary, this utility model, through its meticulously designed collection tray 1 structure and auxiliary components, combined with a reasonable packing layer arrangement, provides an innovative solution for the efficient separation of acetic acid and water, significantly improving process performance and product quality, while also possessing significant cost-effectiveness advantages.

[0077] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A liquid-liquid distributor for an extraction tower used in the separation of acetic acid and water, characterized in that, The extraction tower (12) includes an extraction tower (12) with a collection tray (1) inside. The upper end of the extraction tower (12) has a raw material feed channel (17), the lower end has an extraction feed channel (16), and the top of the extraction tower (12) has a discharge channel (18). The collection tray (1) includes a base plate (20), a conical tube (2), and a baffle (3). The base plate (20) includes an inner plate (11) and an outer plate (10). A tapered groove (7) is provided between the inner plate (11) and the inner plate (11). A tapered hole (5) is provided on the inner plate (11). The tapered tube (2) is installed on the inner side of the inner plate (11). A side frame (6) is provided on the side of the baffle (3). The side frame (6) is installed on the inner plate (11) by bolts. The baffle (3) is located above the tapered tube (2). A number of through holes (9) are arranged around the baffle (3). A number of through holes (8) are arranged around the inner wall of the tapered groove (7).

2. The liquid-liquid distributor for an extraction tower used for separating acetic acid and water according to claim 1, characterized in that, The collection tray (1) has at least two layers inside the extraction tower (12).

3. The liquid-liquid distributor for an extraction tower used for separating acetic acid and water according to claim 2, characterized in that, The baffle (3) is provided with a conical shroud (4) on its side.

4. The liquid-liquid distributor for an extraction tower used for separating acetic acid and water according to claim 3, characterized in that, The through hole 1 (9) is provided with 20-50 holes around the baffle (3).

5. A liquid-liquid distributor for an extraction tower used for separating acetic acid and water according to claim 4, characterized in that, The second through hole (8) is located on the inner plate (11), and the second through hole (8) is opened in 4 circles from top to bottom on the bottom side of the conical groove (7), and the number of the second through holes (8) is 20-50.

6. The liquid-liquid distributor for an extraction tower used for separating acetic acid and water according to claim 5, characterized in that, The extraction tower (12) is provided with a first packing layer (13), a second packing layer (14) and a third packing layer (15). The first packing layer (13) is located at the bottom of the extraction tower (12) and is connected to the extraction feed channel (16). The third packing layer (15) is located at the top of the extraction tower (12) and is connected to the raw material feed channel (17). The second packing layer (14) is located between two collection trays (1).

7. A liquid-liquid distributor for an extraction tower used for separating acetic acid and water according to claim 6, characterized in that, The bottom of the extraction tower (12) is provided with a drainage channel (19).

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