Novel composite extracting agent for refining acetic acid

Abstract

The utility model relates to the technical field of chemical separation, in particular to a novel composite extractant for refining acetic acid, which comprises an extraction tower, a recovery tower, a reboiler and a condenser, an extractant feed port is arranged at the top end of the extraction tower, a raw material inlet is arranged at the bottom end of the extraction tower, and a discharge pipe is arranged at the bottom of the extraction tower. The discharge pipe is communicated with the recovery tower through a recovery pipe, a liquid discharge pipe is arranged at the bottom of the recovery tower, a flow guide pipe I is arranged on the liquid discharge pipe, the reboiler comprises a reboiler I and a reboiler II, the reboiler I is communicated with the discharge pipe and the extraction tower through a circulating pipe I, and the extraction tower and the recovery tower are linked. Efficient separation and cyclic utilization of the extraction agent and acetic acid are achieved, waste of raw materials is reduced, the extraction agent can be effectively recycled and recycled through the recovery tower, consumption of chemicals and generation of waste are reduced, and the environmental protection benefit is remarkable.

Description

A novel composite extractant for acetic acid refining Technical Field

[0001] This utility model relates to the field of chemical separation technology, specifically a novel composite extractant for acetic acid refining. Background Technology

[0002] In the field of chemical production, the separation of acetic acid from water is a crucial process, widely used in organic synthesis, pharmaceuticals, dye manufacturing, and food processing. However, traditional separation methods, such as simple distillation or extraction techniques, have revealed a series of significant problems and shortcomings in practical applications.

[0003] First, in terms of separation efficiency, single distillation or extraction methods often fail to achieve ideal separation of light and heavy components. Distillation relies on the difference in volatility between components to achieve separation, but in systems with similar boiling points, such as acetic acid and water, the separation efficiency of distillation is limited. Similarly, while extraction methods can achieve separation by selectively dissolving a component in a solvent, a single extraction process often fails to achieve highly efficient separation. These problems lead to the poor performance of traditional methods in terms of separation efficiency, making it difficult to meet the urgent needs of modern chemical production for efficient separation technologies.

[0004] Secondly, traditional methods are typically accompanied by high energy consumption. Both distillation and extraction require heating the materials to facilitate the separation process. However, due to the limitations of these methods in terms of thermal efficiency, they often require high heating temperatures and large energy inputs, thus increasing production costs and energy consumption. This problem is particularly prominent against the backdrop of increasingly tense global energy conditions.

[0005] Furthermore, traditional methods also suffer from resource waste. Particularly during the extraction process, the extractant is often used only once and then discharged, which not only wastes the extractant but may also pollute the environment. With increasing environmental awareness, this issue of resource waste and environmental pollution is receiving growing attention from society.

[0006] Finally, traditional methods suffer from complex equipment structures, high maintenance costs, and difficulty in achieving automated control. This affects the continuity and stability of the production process, reducing production efficiency. In modern chemical production, automation and intelligence are crucial for improving efficiency and reducing labor costs. However, the shortcomings of traditional methods in this regard limit their widespread application in modern chemical production. Summary of the Invention

[0007] (a) Technical problems to be solved

[0008] To address the shortcomings of existing technologies, this invention provides a novel composite extractant for acetic acid refining.

[0009] (II) Technical Solution

[0010] To achieve the above objectives, this utility model provides the following technical solution: A novel composite extractant for acetic acid refining comprises an extraction tower, a recovery tower, a reboiler, and a condenser. The top of the extraction tower is provided with an extractant inlet, and the bottom of the extraction tower is provided with a raw material inlet. The bottom of the extraction tower is provided with a discharge pipe, which is connected to the recovery tower through a recovery pipe. The bottom of the recovery tower is provided with a liquid discharge pipe, and a guide pipe is provided on the liquid discharge pipe. The reboiler includes a first reboiler and a second reboiler, and the first reboiler is connected to the discharge pipe through a circulation pipe. The reboiler is connected to the extraction tower via a circulation pipe and to the drain pipe and recovery tower via a circulation pipe. The condenser includes an acetic acid condenser and an extractant condenser. The input end of the acetic acid condenser is connected to the top of the extraction tower via a pipe. The output end of the acetic acid condenser is connected to the top of the extraction tower via a condenser pipe and a guide pipe is provided on the condenser pipe. The output end of the extractant condenser is connected to the top of the recovery tower via a pipe. The output end of the extractant condenser is connected to the top of the recovery tower via a condenser pipe and a guide pipe is provided on the condenser pipe.

[0011] Preferably, the output end of the acetic acid condenser is connected to a reflux tank, the first condenser tube is connected to the output end of the reflux tank, the output end of the extractant condenser is connected to an extractant buffer tank, and the second condenser tube is connected to the output end of the extractant buffer tank.

[0012] More preferably, a pump body is installed on each of the drain pipe, the discharge pipe, the first condenser pipe, and the second condenser pipe.

[0013] Preferably, both the extraction tower and the recovery tower are equipped with pressure sensors and temperature sensors at their tops, and the tops of the extraction tower and the recovery tower are equipped with sensor interfaces, which are electrically connected to the pressure sensors and temperature sensors.

[0014] Preferably, the inner wall of the extraction tower is provided with an anti-corrosion coating, and the outer side of the extraction tower is provided with a heat insulation layer.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model provides a novel composite extractant for acetic acid refining, which has the following beneficial effects:

[0017] High-efficiency synergy between extraction tower and recovery tower

[0018] Dual-tower linkage: Through the design of discharge pipe, recovery pipe and guide pipe, the extractant and acetic acid are efficiently separated and recycled, reducing raw material waste.

[0019] Anti-corrosion coating + insulation layer: The anti-corrosion coating on the inner wall of the extraction tower extends the equipment's lifespan, while the external insulation layer maintains the stability of the reaction temperature and reduces energy consumption.

[0020] Reboiler two-stage optimization

[0021] Reboiler 1 (extraction tower side): The extractant is regenerated efficiently through circulation pipe 1, thereby improving extraction efficiency.

[0022] Reboiler 2 (recovery tower side): Optimize extractant recovery through circulation pipe 2 to reduce residual impurity concentration.

[0023] Staged control of condensation system

[0024] Acetic acid condenser: Connected to a reflux tank, it enables high-purity condensation and circulation of acetic acid vapor, reducing product loss.

[0025] Extractant condenser: Works in conjunction with the extractant buffer tank to ensure the stability and continuity of the extractant recovery process. Attached Figure Description

[0026] Figure 1 is a schematic diagram of the overall structure of this utility model;

[0027] Figure 2 is an enlarged schematic diagram of the top structure of the extraction tower of this utility model;

[0028] In the diagram: 1. Extraction tower; 2. Recovery tower; 3. Reboiler 1; 4. Reboiler 2; 5. Acetic acid condenser; 6. Extractant condenser; 7. Reflux tank; 8. Extractant buffer tank; 9. Extractant inlet; 10. Raw material inlet; 11. Discharge pipe; 12. Circulation pipe 1; 13. Guide pipe 1; 14. Recovery pipe; 15. Drain pipe; 16. Circulation pipe 2; 17. Sensor interface; 18. Condenser 1; 19. Guide pipe 2; 20. Condenser 2; 21. Guide pipe 3. Detailed Implementation

[0029] 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.

[0030] Please refer to Figures 1-2. This invention discloses a novel composite extractant for acetic acid refining, comprising an extraction tower 1, a recovery tower 2, a reboiler, and a condenser. The extraction tower 1 has an extractant inlet 9 at its top and a raw material inlet 10 at its bottom. A discharge pipe 11 is located at the bottom of the extraction tower 1, and this discharge pipe 11 is connected to the recovery tower 2 via a recovery pipe 14. A liquid discharge pipe 15 is located at the bottom of the recovery tower 2, and a guide pipe 13 is attached to the liquid discharge pipe 15. The reboiler includes a first reboiler 3 and a second reboiler 4. The first reboiler 3 is connected to the discharge pipe 11 and the extraction tower 1 via a circulation pipe 12. The reboiler 2 4 is connected to the drain pipe 15 and the recovery tower 2 via the circulation pipe 2 16. The condenser includes an acetic acid condenser 5 and an extractant condenser 6. The input end of the acetic acid condenser 5 is connected to the top of the extraction tower 1 via a pipe. The output end of the acetic acid condenser 5 is connected to the top of the extraction tower 1 via a condenser pipe 18. A guide pipe 2 19 is provided on the condenser pipe 18. The output end of the extractant condenser 6 is connected to the top of the recovery tower 2 via a pipe. The output end of the extractant condenser 6 is connected to the top of the recovery tower 2 via a condenser pipe 20. A guide pipe 3 21 is provided on the condenser pipe 20.

[0031] The novel composite extractant for acetic acid refining mainly includes an extraction tower 1, a recovery tower 2, reboilers (including reboiler 3 and reboiler 4), and condensers (including acetic acid condenser 5 and extractant condenser 6). Through the synergistic operation of these components, a highly efficient and continuous acetic acid refining process is achieved.

[0032] Extraction tower 1: Used to mix acetic acid in the raw material with a composite extractant to achieve preliminary separation.

[0033] Recovery tower 2: Used for further separation and recovery of the extractant, enabling its recycling.

[0034] Reboiler: Heats liquids to generate steam, promoting the separation and recycling of substances.

[0035] Condenser: Cools gaseous substances into liquid state for easier subsequent processing and recycling.

[0036] Working principles of various preferred technical solutions

[0037] Multistage condensation and reflux

[0038] Acetic acid condenser 5: Gaseous acetic acid collected from the top of extraction tower 1 is cooled into liquid by the condenser and returned to the top of extraction tower 1 through condenser tube 18. In order to better control the reflux ratio, the output end of acetic acid condenser 5 is connected to reflux tank 7, and condenser tube 18 is connected to the output end of reflux tank 7.

[0039] Extractant condenser 6: The gaseous extractant collected from the top of the recovery tower 2 is cooled into a liquid state by the condenser and returned to the top of the recovery tower 2 through condenser pipe 20. In order to stabilize the flow rate of the extractant, the output end of the extractant condenser 6 is connected to the extractant buffer tank 8, and the condenser pipe 20 is connected to the output end of the extractant buffer tank 8.

[0040] Reboiler Circulation

[0041] Reboiler 3: It is connected to the discharge pipe 11 and the extraction tower 1 through the circulation pipe 12. The material discharged from the bottom of the extraction tower 1 is heated and sent back to the extraction tower 1 to ensure that the material is fully contacted and separated in the tower.

[0042] Reboiler 2 4: It is connected to the drain pipe 15 and the recovery tower 2 through the circulation pipe 2 16. The material discharged from the bottom of the recovery tower 2 is heated and sent back to the recovery tower 2 to ensure the effective recovery and recycling of the extractant.

[0043] Pump body and piping design

[0044] Pump body installation: Pump bodies are installed on the drain pipe 15, discharge pipe 11, condenser pipe 18 and condenser pipe 20 to ensure smooth flow of materials and gas in each part and avoid blockage and pressure imbalance.

[0045] Sensor monitoring

[0046] Pressure and temperature sensors: Pressure and temperature sensors are installed at the top of both extraction tower 1 and recovery tower 2. The pressure and temperature changes inside the tower are monitored in real time through sensor interface 17 to ensure the stable operation of the system.

[0047] Corrosion prevention and insulation measures

[0048] Anti-corrosion coating: The inner wall of extraction tower 1 is equipped with an anti-corrosion coating to prevent corrosive substances from damaging the equipment and extend its service life.

[0049] Insulation layer: An insulation layer is provided on the outside of the extraction tower 1 to reduce heat loss and improve energy utilization efficiency.

[0050] Compound extractant

[0051] Developing a composite extractant: The composite extractant used in this system can entrain water into extraction tower 1, thereby improving the purity of acetic acid. Qualified acetic acid with a purity of 99.5% can be directly obtained from the top of extraction tower 1.

[0052] Detailed Workflow

[0053] Initial feed

[0054] Feed to Extraction Tower 1: The raw material enters the bottom of Extraction Tower 1 through Raw Material Inlet 10, while the composite extractant enters the top of Extraction Tower 1 through Extractant Inlet 9. The raw material and extractant come into countercurrent contact inside the tower, initially separating the mixture containing acetic acid.

[0055] Operation of Extraction Tower 1

[0056] Extraction and separation: Acetic acid in the feedstock and extractant are fully contacted and separated in extraction tower 1. The lighter acetic acid rises to the top of the tower, while the heavier extractant sinks to the bottom.

[0057] Discharge: The discharge pipe 11 at the bottom of the extraction tower 1 discharges the material containing a large amount of extractant, which is then transported to the recovery tower 2 through the recovery pipe 14.

[0058] Reboiler 1-3 Circulation

[0059] Heating and circulation: The material in the discharge pipe 11 enters the reboiler 3 for heating, and the generated steam returns to the extraction tower 1. The unevaporated part continues to circulate back to the bottom of the extraction tower 1, ensuring that the material is fully contacted and separated in the tower.

[0060] Operation of recovery tower 2

[0061] Extractant recovery: Recovery tower 2 receives the discharge from extraction tower 1 and further separates the extractant. The lighter extractant rises to the top of the tower, while the heavier impurities or residues sink to the bottom.

[0062] Drainage: The drain pipe 15 at the bottom of the recovery tower 2 discharges the material containing less extractant, which is then processed through the guide pipe 13.

[0063] Reboiler II 4-cycle

[0064] Heating and circulation: The material in the drain pipe 15 enters the reboiler 2 4 for heating, and the generated steam returns to the recovery tower 2. The unevaporated part continues to circulate back to the bottom of the recovery tower 2, ensuring the effective recovery and recycling of the extractant.

[0065] Condensation and reflux

[0066] Acetic acid condenser 5: The gaseous acetic acid at the top of the extraction tower 1 is cooled into liquid by the acetic acid condenser 5. Part of it returns to the top of the extraction tower 1 through the condenser pipe 18, and the other part enters the reflux tank 7 through the guide pipe 19. The reflux ratio is adjusted as needed.

[0067] Extractant condenser 6: The gaseous extractant at the top of the recovery tower 2 is cooled into liquid by the extractant condenser 6. Part of it returns to the top of the recovery tower 2 through the second condenser pipe 20, and the other part enters the extractant buffer tank 8 through the third guide pipe 21 to ensure a stable supply of extractant.

[0068] Sensor monitoring and adjustment

[0069] Real-time monitoring: Pressure and temperature changes within extraction tower 1 and recovery tower 2 are monitored in real time using pressure and temperature sensors to ensure stable system operation. If necessary, parameters are adjusted by regulating pumps and valves to maintain optimal operating conditions.

[0070] High-efficiency refining

[0071] High-purity acetic acid: By using a composite extractant, qualified acetic acid with a purity of up to 99.5% can be directly obtained from the top of extraction tower 1, which significantly improves product quality.

[0072] Energy saving and consumption reduction

[0073] Reduced steam consumption: The steam consumption for processing one ton of acetic acid is reduced by 25% compared to traditional methods, significantly reducing production costs.

[0074] Equipment optimization

[0075] Miniaturized design: The diameter of extraction column 1 is 30% smaller than that of ordinary distillation column and 14% smaller than that of azeotropic distillation column. The column height is 15-25 meters lower, resulting in lower overall investment and less floor space.

[0076] Resource recycling

[0077] Extractant recovery: Recovery tower 2 can effectively recover and recycle the extractant, reducing the consumption of chemicals and the generation of waste, resulting in significant environmental benefits.

[0078] Stable operation

[0079] Sensor monitoring: The system status is monitored in real time through pressure and temperature sensors to ensure the stability and reliability of the entire process.

[0080] Corrosion protection and heat preservation

[0081] Anti-corrosion coating and insulation layer: The anti-corrosion coating on the inner wall of extraction tower 1 extends the service life of the equipment, while the external insulation layer reduces heat loss and improves energy utilization efficiency.

[0082] 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 novel composite extractant for acetic acid refining, characterized in that, The system includes an extraction tower (1), a recovery tower (2), a reboiler, and a condenser. The top of the extraction tower (1) is provided with an extractant inlet (9), and the bottom of the extraction tower (1) is provided with a raw material inlet (10). The bottom of the extraction tower (1) is provided with a discharge pipe (11), which is connected to the recovery tower (2) through a recovery pipe (14). The bottom of the recovery tower (2) is provided with a liquid drain pipe (15), which is provided with a guide pipe (13). The reboiler includes a reboiler one (3) and a reboiler two (4). The reboiler one (3) is connected to the discharge pipe (11) and the extraction tower (1) through a circulation pipe (12). The reboiler two (4) is connected to the extraction tower (1) through a circulation pipe (12). The second ring pipe (16) is connected to the drain pipe (15) and the recovery tower (2). The condenser includes an acetic acid condenser (5) and an extractant condenser (6). The input end of the acetic acid condenser (5) is connected to the top of the extraction tower (1) through a pipe. The output end of the acetic acid condenser (5) is connected to the top of the extraction tower (1) through a condenser pipe (18). A guide pipe (29) is provided on the condenser pipe (18). The output end of the extractant condenser (6) is connected to the top of the recovery tower (2) through a pipe. The output end of the extractant condenser (6) is connected to the top of the recovery tower (2) through a condenser pipe (20). A guide pipe (31) is provided on the condenser pipe (20).

2. The novel composite extractant for acetic acid refining according to claim 1, characterized in that, The output end of the acetic acid condenser (5) is connected to a reflux tank (7), the first condenser tube (18) is connected to the output end of the reflux tank (7), the output end of the extractant condenser (6) is connected to an extractant buffer tank (8), and the second condenser tube (20) is connected to the output end of the extractant buffer tank (8).

3. The novel composite extractant for acetic acid refining according to claim 2, characterized in that, Pump bodies are installed on the drain pipe (15), the discharge pipe (11), the first condenser pipe (18), and the second condenser pipe (20).

4. A novel composite extractant for acetic acid refining according to claim 3, characterized by, The top of the extraction tower (1) and the recovery tower (2) are equipped with pressure sensors and temperature sensors. The top of the extraction tower (1) and the recovery tower (2) are equipped with sensor interfaces (17), and the sensor interfaces (17) are electrically connected to the pressure sensors and temperature sensors.

5. A novel composite extractant for acetic acid refining according to claim 4, characterized in that, The inner wall of the extraction tower (1) is provided with an anti-corrosion coating, and the outer side of the extraction tower (1) is provided with a heat insulation layer.

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