A system for purifying amine solution

Abstract

The present application relates to amine liquid purification, and provides a system for purifying amine liquid, comprising an amine liquid supply system, a desalted water supply system, an electrode water supply system, an electrodialyzer, and a cleaning system; the amine liquid supply system, the desalted water supply system, the electrode water supply system, and the cleaning system are simultaneously connected with the inlet end and the outlet end of the electrodialyzer. The system for purifying amine liquid can efficiently purify the amine liquid, and the purified amine liquid has higher indicators, lower loss, and lower cost.

Description

Technical Field

[0001] This invention relates to the technical field of amine liquid purification, and more specifically, to a system for purifying amine liquid. Background Technology

[0002] Amine solutions are a general term for a class of organic alkaline solutions, typically referring to weakly alkaline organic amine solvents used in desulfurization and decarbonization chemical processes to absorb hydrogen sulfide or carbon dioxide, with alcoholic amines being the most common. The active amine absorption method is a deacidification method based on a reversible chemical reaction, using an alkaline solvent as the absorbent. The solvent reacts with the acidic components in the feed gas to generate compounds; the rich solution that has absorbed the acidic gas can decompose again under conditions of increased temperature and decreased pressure, releasing the acidic gas, thus achieving solvent regeneration and reuse.

[0003] During use, amine solutions accumulate impurities such as hydrocarbons, degradation products, suspended solids, and thermally stable salts. These impurities cause the amine solution to foam, increasing the heat required for amine regeneration and leading to amine loss. This can cause blockages in equipment and pipelines, accelerate corrosion, and in severe cases, affect the normal operation of the entire system. To solve the foaming problem, real-time purification of the amine solution system is necessary.

[0004] Currently, the amine liquor purification in the desulfurization systems of organic amines in various smelting enterprises mainly relies on resin exchange systems and freeze crystallization systems to remove impurity ions from the amine liquor. Resin exchange systems suffer from high amine liquor loss, low ion removal efficiency, and large consumption of alkali solution during operation; freeze crystallization systems can only remove thermally stable salts from the amine liquor. Neither system can meet the amine liquor purification requirements. Furthermore, existing amine liquor purification systems have high operating costs, and their purification efficiency does not meet production needs. The enrichment rate of impurity ions in the amine liquor exceeds the processing efficiency of the amine liquor purification system, leading to a gradual deterioration of amine liquor indicators. Summary of the Invention

[0005] The purpose of this invention is to provide a system for purifying amine liquid, which can efficiently purify amine liquid, and the purified amine liquid has higher performance indicators, lower losses, and lower costs.

[0006] The embodiments of the present invention are achieved through the following technical solutions: The system for purifying amine liquid of the present invention includes an amine liquid supply system, a demineralized water supply system, an electrodialysis unit, and a cleaning system; the amine liquid supply system, the demineralized water supply system, the electrodialysis unit, and the cleaning system are all connected to the inlet and outlet ends of the electrodialysis unit.

[0007] Furthermore, the cleaning system includes a first liquid guide pipe connected to the inlet end of the electrodialysis unit, a second liquid guide pipe connected to the outlet end of the electrodialysis unit, a storage tank, a partition disposed in the storage tank, and an air supply device; the partition divides the storage tank into a first chamber and a second chamber, the air supply device is connected to both the first chamber and the second chamber, the first liquid guide pipe is connected to the first chamber, and the second liquid guide pipe is connected to the second chamber.

[0008] Furthermore, both the first chamber and the second chamber are equipped with exhaust pipes.

[0009] Furthermore, the air supply device includes an air compressor, an air pressure pipe connected to the air compressor, a three-way valve connected to the air pressure pipe, and a first conduit and a second conduit connected to the three-way valve; the first conduit communicates with the first chamber, and the second conduit communicates with the second chamber.

[0010] Furthermore, the three-way valve is an automatic three-way valve.

[0011] Furthermore, the cleaning system also includes a pipette for connecting the first chamber and the second chamber, and a pipette pump disposed on the pipette.

[0012] Furthermore, the amine supply system includes an amine tank, an amine pump, and an amine filter connected in sequence to the electrodialysis unit.

[0013] Furthermore, the demineralized water supply system includes a demineralized water tank, a demineralized water pump, a demineralized water filter, and a demineralized water heat exchanger connected in sequence to the electrodialysis unit.

[0014] Furthermore, the electro-water supply system includes an electro-water tank, an electro-water pump, an electro-water filter, and an electro-water heat exchanger connected in sequence to the electrodialysis unit.

[0015] The technical solution of this invention has at least the following advantages and beneficial effects: In the amine purification system of this invention, the amine solution to be purified, demineralized water, and electrodialysis water are respectively fed into the electrodialysis unit through an amine solution supply system, a demineralized water supply system, and an electrodialysis water supply system. Under the selective permeability of the ion exchange membrane in the electrodialysis unit, the anions and cations in the solution undergo directional migration, thereby achieving the separation of ions from the solution. Furthermore, the cleaning system can periodically clean the electrodialysis unit, ensuring it maintains high separation efficiency. Compared to traditional amine purification methods, this system eliminates the need for regeneration agents, requires less demineralized water, achieves a higher ion removal rate, and can also remove SO4 from the amine solution. 2- F - CL - S2O32 It also removes thermally stable salts such as sodium sulfate, calcium sulfate, nitrate, and thiosulfate from the amine solution, improving the amine solution's properties, ensuring the normal operation of the amine desulfurization system, and achieving lower costs, less amine solution loss, and continuous pressurized processing. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the system for purifying amine liquid provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the cleaning system provided in an embodiment of the present invention.

[0018] Icons: 11-Amine solution tank, 12-Amine solution pump, 13-Amine solution filter, 21-Demineralized water tank, 22-Demineralized water pump, 23-Demineralized water filter, 24-Demineralized water heat exchanger, 31-Electrode water tank, 32-Electrode water pump, 33-Electrode water filter, 34-Electrode water heat exchanger, 40-Cleaning system, 41-Storage tank, 42-Baffle plate, 43-First liquid guide pipe, 44-Second liquid guide pipe, 45-First chamber, 46-Second chamber, 47-Gas pressure pipe, 48-Three-way valve, 49-First conduit, 410-Second conduit, 411-Exhaust pipe, 412-Pipette, 413-Water pump, 50-Electrodialysis unit. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this invention, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0023] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] Example The following description, in conjunction with specific embodiments, further illustrates the point, as shown in the appendix. Figure 1 - Appendix Figure 2 As shown, the amine purification system of this embodiment includes an amine supply system, a demineralized water supply system, an electrodialysis unit 50, and a cleaning system 40. The amine supply system, demineralized water supply system, electrodialysis unit, and cleaning system 40 are all connected to both the inlet and outlet of the electrodialysis unit 50. Specifically, during use, the amine supply system, demineralized water supply system, and electrodialysis unit supply system respectively supply the amine solution, demineralized water, and electrodialysis unit into the electrodialysis unit 50. Due to the selective permeability of the ion exchange membrane in the electrodialysis unit 50, the anions and cations in the solution migrate directionally, thereby achieving ion separation from the solution. The cleaning system 40 periodically cleans the electrodialysis unit 50, ensuring it maintains high separation efficiency. Compared to traditional amine purification methods, this system eliminates the need for regeneration agents, requires less demineralized water, achieves a higher ion removal rate, and can also remove SO4 from the amine solution. 2- F - CL - S2O3 2 This process removes thermally stable salts such as sodium sulfate, calcium sulfate, nitrate, and thiosulfate from the amine solution, improving the amine solution's properties, ensuring the normal operation of the amine desulfurization system, and achieving lower costs, less amine solution loss, and continuous pressurized processing. It is important to note that the electrodialysis unit has amine solution, demineralized water, and electrode water pathways, and the cleaning device needs to be connected to and clean all three pathways simultaneously.

[0025] The cleaning system 40 in this embodiment includes a first liquid guide pipe 43 connected to the inlet end of the electrodialysis unit 50, a second liquid guide pipe 44 connected to the outlet end of the electrodialysis unit 50, a storage tank 41, a partition 42 disposed within the storage tank 41, and an air supply device. The partition 42 divides the storage tank 41 into a first chamber 45 and a second chamber 46. The air supply device is connected to both the first chamber 45 and the second chamber 46. The first liquid guide pipe 43 is connected to the first chamber 45, and the second liquid guide pipe 44 is connected to the second chamber 46. Specifically, see attached... Figure 2 As shown, before cleaning, the amine supply system and the demineralized water supply system need to be shut off. The electrodialysis water supply system supplies liquid to the electrodialysis unit 50. Then, the cleaning liquid in the storage tank 41 can be used to clean the electrodialysis unit 50 in both forward and reverse directions. Specifically, this can be achieved by intermittently supplying gas to the first chamber 45 and the second chamber 46 respectively through the gas supply device. When only the first chamber 45 is supplied with gas, the cleaning liquid in the first chamber 45 can be sent to the inlet end of the electrodialysis unit 50 through the first liquid guide pipe 43. Forward cleaning is achieved; when only air is supplied to the second chamber 46, the cleaning solution in the second chamber 46 can be sent to the outlet end of the electrodialysis unit 50 through the second liquid guide tube 44 to achieve backwashing; in this way, by rapidly switching the air supply multiple times, not only can forward and reverse cleaning be achieved, thus better cleaning the membrane in the electrodialysis unit 50, but also a high-frequency reciprocating impact can be formed in the electrodialysis unit 50, so that the cleaning solution generates a certain frequency vibration in the electrodialysis unit 50, thus better performing the cleaning operation.

[0026] In this embodiment, both the first chamber 45 and the second chamber 46 are equipped with exhaust pipes 411. Specifically, the exhaust pipes 411 are mainly used to balance air pressure, so an automatic valve needs to be installed on the exhaust pipes 411.

[0027] The gas supply device in this embodiment includes a gas compressor, a gas pressure pipe 47 connected to the gas compressor, a three-way valve 48 connected to the gas pressure pipe 47, and a first conduit 49 and a second conduit 410 connected to the three-way valve 48. The first conduit 49 is connected to a first chamber 45, and the second conduit 410 is connected to a second chamber 46. Specifically, the three-way valve 48 allows gas to enter either the first conduit 49 (i.e., the first chamber 45) or the second conduit 410 (i.e., the second chamber 46).

[0028] In this embodiment, the three-way valve 48 is an automatic three-way valve 48. Specifically, the three-way valve 48 can be quickly switched by means of a solenoid or pneumatic three-way valve 48.

[0029] The cleaning system 40 in this embodiment also includes a pipette 412 for connecting the first chamber 45 and the second chamber 46, and a pipette pump 413 disposed on the pipette 412. Specifically, the pipette pump 413 and pipette 412 enable the cleaning solution to move in one direction while reciprocating within the electrodialysis unit 50 on a microscopic scale. This is achieved by the pipette pump 413 and pipette 412 slowly transferring the liquid from the first chamber 45 to the second chamber 46 (or vice versa), causing the amount of liquid in the first chamber 45 to decrease slowly and the amount of liquid in the second chamber 46 to increase gradually. Consequently, the amount of air in the first chamber 45 gradually increases and the amount of air in the second chamber 46 gradually decreases. When the same amount of air is pumped into the first chamber 45 and the second chamber 46, due to the compressibility of air, the amount of liquid discharged from the first chamber 45 is less than the amount discharged from the second chamber 46. This means that the cleaning solution moves different distances to the two sides in one reciprocating cycle, thus achieving a macroscopic shift to one side. This design facilitates real-time replacement of the cleaning solution.

[0030] The amine supply system in this embodiment includes an amine tank 11, an amine pump 12, and an amine filter 13 connected in sequence to the electrodialysis unit 50. The demineralized water supply system includes a demineralized water tank 21, a demineralized water pump 22, a demineralized water filter 23, and a demineralized water heat exchanger 24 connected in sequence to the electrodialysis unit 50. The electrode water supply system includes an electrode water tank 31, an electrode water pump 32, an electrode water filter 33, and an electrode water heat exchanger 34 connected in sequence to the electrodialysis unit 50. Specifically, these devices are mainly used for pretreatment of the amine solution, demineralized water, and electrode water.

[0031] In summary, the amine purification system of this embodiment, during use, delivers the amine solution, demineralized water, and electrode water to be purified into the electrodialysis unit 50 through an amine solution supply system, a demineralized water supply system, and an electrode water supply system, respectively. Due to the selective permeability of the ion exchange membrane in the electrodialysis unit 50, the anions and cations in the solution undergo directional migration, thereby achieving ion separation from the solution. Furthermore, the cleaning system 40 periodically cleans the electrodialysis unit 50, ensuring it maintains high separation efficiency. Compared to traditional amine purification methods, this system eliminates the need for regeneration agents, requires less demineralized water, achieves a higher ion removal rate, and can also remove SO4 from the amine solution. 2- F - CL - S2O3 2 It also removes thermally stable salts such as sodium sulfate, calcium sulfate, nitrate, and thiosulfate from the amine solution, improving the amine solution's properties, ensuring the normal operation of the amine desulfurization system, and achieving lower costs, less amine solution loss, and continuous pressurized processing.

[0032] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A system for purifying amine liquid, characterized in that: It includes an amine supply system, a demineralized water supply system, an electrodialysis unit (50), and a cleaning system (40). The amine supply system, the demineralized water supply system, the electro-water supply system, and the cleaning system (40) are all connected to the inlet and outlet of the electrodialysis unit (50). The cleaning system (40) includes a first liquid guide pipe (43) connected to the inlet end of the electrodialysis unit (50), a second liquid guide pipe (44) connected to the outlet end of the electrodialysis unit (50), a storage tank (41), a partition (42) disposed in the storage tank (41), and an air supply device; the partition (42) divides the storage tank (41) into a first chamber (45) and a second chamber (46), the air supply device is connected to both the first chamber (45) and the second chamber (46), the first liquid guide pipe (43) is connected to the first chamber (45), and the second liquid guide pipe (44) is connected to the second chamber (46); both the first chamber (45) and the second chamber (46) are provided with exhaust pipes (411); The air supply device includes an air compressor, an air pressure pipe (47) connected to the air compressor, a three-way valve (48) connected to the air pressure pipe (47), and a first conduit (49) and a second conduit (410) connected to the three-way valve (48); the first conduit (49) is connected to the first chamber (45), and the second conduit (410) is connected to the second chamber (46); the cleaning system (40) also includes a pipette (412) for connecting the first chamber (45) and the second chamber (46), and a pipette pump (413) provided on the pipette (412).

2. The system for purifying amine solution according to claim 1, characterized in that: The three-way valve (48) is an automatic three-way valve.

3. The system for purifying amine liquid according to claim 1, characterized in that: The amine supply system includes an amine tank (11), an amine pump (12), and an amine filter (13) connected in sequence to the electrodialysis unit (50).

4. The system for purifying amine solution according to claim 1, characterized in that: The demineralized water supply system includes a demineralized water tank (21), a demineralized water pump (22), a demineralized water filter (23), and a demineralized water heat exchanger (24) connected in sequence to the electrodialysis unit (50).

5. The system for purifying amine solution according to claim 1, characterized in that: The electro-water supply system includes an electro-water tank (31), an electro-water pump (32), an electro-water filter (33), and an electro-water heat exchanger (34) connected in sequence to the electrodialysis unit (50).

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