Reaction kettle for preparing high-purity ethylenediamine tetraacetic acid disodium salt

Abstract

The reaction kettle comprises a kettle body, a feeding hopper is arranged at the top end of the kettle body, a discharging pipe is arranged at the bottom end of the kettle body, a stirring mechanism is arranged in the kettle body, a motor is fixedly installed in the middle of the top end of the kettle body, and the motor is in transmission fit with the stirring mechanism; the bottom end of the stirring mechanism is in transmission connection with a suction mechanism, a scraping plate is fixed on the outer wall of the suction mechanism, and the scraping plate is in sliding fit with the bottom plate of the kettle body; a heating assembly is arranged at the bottom end of the kettle body. The stirring mechanism is driven by the motor to rotate, so that raw materials in the kettle body are mixed, and the raw materials can be in full contact; meanwhile, the scraper can prevent the raw materials from depositing at the bottom of the kettle body, and the suction mechanism can suck the raw materials at the bottom of the kettle body away from the bottom of the kettle body, so that the raw materials can be conveniently mixed by the stirring mechanism, and the yield of products can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of processing equipment, in particular to a reaction kettle for preparing high-purity disodium ethylenediaminetetraacetate. Background Art

[0002] Disodium ethylenediaminetetraacetate, or EDTA disodium for short, plays a vital role in the food industry. This white or light yellow powder is easily soluble in water and has a unique ability to chelate metal ions, showing significant effects in food preservation, color protection, anti-oxidation and anti-corrosion.

[0003] The reactor is an indispensable equipment in the production process of disodium ethylenediaminetetraacetate. The more common reactors now usually include a tank body, a feed pipe is set at the top of the tank body, and a discharge pipe is set at the bottom of the reactor. Workers put the raw materials into the reactor through the feed pipe, and the raw materials undergo chemical reactions during the reaction. After the reaction is completed, the workers discharge the prepared raw materials through the discharge pipe. After the raw materials enter the reactor, some of the raw materials will condense into blocks, so that the raw materials cannot fully contact, affecting the final preparation results.

[0004] Therefore, it is urgent to provide a reaction kettle for preparing high-purity disodium ethylenediaminetetraacetate to achieve the purpose of sufficient contact of the input raw materials. Summary of the invention

[0005] The purpose of the present invention is to provide a reaction kettle for preparing high-purity disodium ethylenediaminetetraacetate to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides a reaction kettle for preparing high-purity disodium ethylenediaminetetraacetate, comprising a kettle body, a feed hopper is arranged at the top of the kettle body, a discharge pipe is arranged at the bottom of the kettle body, a stirring mechanism is arranged in the kettle body, a motor is fixedly installed at the middle of the top of the kettle body, and the motor is in transmission cooperation with the stirring mechanism; a suction mechanism is transmission-connected to the bottom end of the stirring mechanism, a scraper is fixed on the outer wall of the suction mechanism, and the scraper is slidably matched with the bottom plate of the kettle body; a heating component is arranged at the bottom end of the kettle body.

[0007] Preferably, the stirring mechanism includes a stirring shaft arranged in the kettle body, the top end of the stirring shaft is drivingly connected to the output shaft of the motor; a plurality of stirring rods are fixedly connected to the stirring shaft, and the stirring rods are arranged in a vertical direction; the suction mechanism is installed at the bottom end of the stirring shaft.

[0008] Preferably, a plurality of crushing teeth are fixedly connected to the top end of the stirring rod, and the crushing teeth are arranged at equal intervals along the length direction of the stirring rod.

[0009] Preferably, one side of the stirring rod is a triangular structure, and the other side of the stirring rod is a concave arc structure.

[0010] Preferably, a plurality of through holes are formed on the stirring rod, and the through holes are arranged in a horizontal direction, and one crushing tooth is arranged between two adjacent through holes.

[0011] Preferably, the aperture of the through hole at one end of the triangular structure of the stirring rod is smaller than the aperture of the through hole at one end of the concave arc structure of the stirring rod.

[0012] Preferably, the suction mechanism includes a sleeve, which is slidably mounted on the bottom of the stirring shaft, and a gap is provided between the bottom end of the sleeve and the bottom plate of the kettle body; a baffle, a sun gear, a planetary gear and a gear ring are provided on the inner top of the sleeve, and the gear ring, the sun gear and the planetary gear are all located above the baffle; the sun gear is coaxially fixedly connected to the bottom end of the stirring shaft, the bottom end of the sun gear is rotatably connected to a column, the bottom end of the column is fixedly connected to the bottom plate of the kettle body, the baffle is fixedly mounted on the column, and the baffle and the sleeve are slidably matched; the gear ring The ring is fixedly connected to the top inner wall of the sleeve, the ring gear is coaxially arranged with the sun gear, the planetary gear is arranged between the ring gear and the sun gear, the planetary gear is rotatably connected to the baffle, the planetary gear is meshed with the ring gear, and the planetary gear is meshed with the sun gear; auger blades are arranged below the baffle, the auger blades are fixedly connected to the inner wall of the sleeve, and the auger blades are slidably matched with the column; a discharge port is opened on the side wall of the sleeve, the top of the discharge port is flush with the bottom end of the baffle, and the scraper is fixedly connected to the bottom of the outer wall of the sleeve.

[0013] Preferably, the scraper is an arc-shaped structure.

[0014] Preferably, a supporting leg is fixedly connected to the bottom end of the kettle body.

[0015] Compared with the prior art, the present invention has the following advantages and technical effects:

[0016] The reaction kettle for preparing high-purity disodium ethylenediaminetetraacetate provided by the present invention has the following steps: raw materials are added into the kettle body through a feed hopper, a heating component is used to heat the solution inside the kettle body to a suitable temperature, and at the same time, a motor is started to drive a stirring mechanism to rotate, so as to mix the raw materials in the kettle body and enable the raw materials to be fully contacted; at the same time, the scraper is provided to prevent the raw materials from being deposited at the bottom of the kettle body, and the suction mechanism is provided to extract the raw materials at the bottom of the kettle body away from the bottom of the kettle body, so that mixing by the stirring mechanism is convenient, which helps to increase the output of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the overall structure of a reaction kettle for preparing high-purity disodium ethylenediaminetetraacetate according to the present invention;

[0019] Figure 2 This is a schematic diagram of the internal structure of a reaction kettle for preparing high-purity disodium ethylenediaminetetraacetate of the present invention;

[0020] Figure 3 This is an internal cross-sectional view of a reaction kettle for preparing high-purity disodium ethylenediaminetetraacetate of the present invention;

[0021] Figure 4 It is an internal cross-sectional view of another position of the reaction kettle for preparing high-purity disodium ethylenediaminetetraacetate of the present invention;

[0022] In the figure: 1. kettle body; 2. feed hopper; 3. discharge pipe; 4. motor; 5. scraper; 6. stirring shaft; 7. stirring rod; 8. crushing teeth; 9. through hole; 10. sleeve; 11. baffle; 12. sun gear; 13. planetary gear; 14. gear ring; 15. column; 16. auger blade; 17. discharge port; 18. support leg. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0024] like Figures 1 to 4 As shown, the present invention provides a reaction kettle for preparing high-purity disodium ethylenediaminetetraacetate, comprising a kettle body 1, a feed hopper 2 is arranged at the top of the kettle body 1, a discharge pipe 3 is arranged at the bottom of the kettle body 1, a stirring mechanism is arranged in the kettle body 1, a motor 4 is fixedly installed at the middle of the top of the kettle body 1, and the motor 4 is in transmission cooperation with the stirring mechanism; a suction mechanism is transmission-connected to the bottom end of the stirring mechanism, a scraper 5 is fixed on the outer wall of the suction mechanism, and the scraper 5 is in sliding cooperation with the bottom plate of the kettle body 1; a heating component is arranged at the bottom end of the kettle body 1.

[0025] When in use, raw materials are added into the kettle body 1 through the feed hopper 2, and the solution inside the kettle body 1 is heated to a suitable temperature by the heating component. At the same time, the motor 4 is started, and the stirring mechanism is driven by the motor 4 to rotate, so as to mix the raw materials in the kettle body 1 so that the raw materials can be fully contacted; at the same time, the scraper 5 is set to prevent the raw materials from being deposited at the bottom of the kettle body 1, and the suction mechanism is set to extract the raw materials at the bottom of the kettle body 1 away from the bottom of the kettle body 1, so that it is convenient to use the stirring mechanism for mixing, which helps to increase the output of the product.

[0026] A further optimized solution is to facilitate stirring of the raw materials in the kettle body 1, wherein the stirring mechanism includes a stirring shaft 6 arranged in the kettle body 1, and the top end of the stirring shaft 6 is drivingly connected to the output shaft of the motor 4; a plurality of stirring rods 7 are fixedly connected to the stirring shaft 6, and the stirring rods 7 are arranged in the vertical direction; and a suction mechanism is installed at the bottom end of the stirring shaft 6.

[0027] To further optimize the solution, in order to improve the stirring effect, a plurality of crushing teeth 8 are fixedly connected to the top of the stirring rod 7 , and the crushing teeth 8 are arranged at equal intervals along the length direction of the stirring rod 7 .

[0028] According to a further optimized solution, one side of the stirring rod 7 is a triangular structure, and the other side of the stirring rod 7 is a concave arc structure.

[0029] By designing one end of the stirring rod 7 into a triangular structure, the resistance of the stirring rod 7 during rotation can be reduced, which helps to increase the rotation speed of the stirring shaft 6 and ensure the normal operation of the suction mechanism at the bottom end of the stirring shaft 6. At the same time, when the liquid flows through the stirring rod 7, the flow rate will be faster. In addition, the other end of the stirring rod 7 is designed to be a concave arc structure, which can make the liquid form a vortex in this area of ​​the stirring rod 7, which helps to improve the stirring effect.

[0030] According to a further optimized solution, a plurality of through holes 9 are provided on the stirring rod 7 , the through holes 9 are arranged in a horizontal direction, and a crushing tooth 8 is provided between two adjacent through holes 9 .

[0031] By setting the through hole 9 and cooperating with the crushing teeth 8, when the liquid flows through the stirring rod 7, a certain flow velocity difference is formed between the flow velocity of the liquid in the through hole 9 and the outside, thereby further improving the stirring effect of the liquid.

[0032] According to a further optimization scheme, the diameter of the through hole 9 at one end of the triangular structure of the stirring rod 7 is smaller than the diameter of the through hole 9 at one end of the concave arc structure of the stirring rod 7 .

[0033] By setting the aperture of the through hole 9, a certain pressure reduction and deceleration effect occurs when the liquid flows through the through hole 9, which is beneficial to the formation of swirl flow, thereby improving the stirring and mixing effect.

[0034] Further optimized scheme, the suction mechanism includes a sleeve 10, the sleeve 10 is slidably sleeved at the bottom of the stirring shaft 6, and a gap is set between the bottom end of the sleeve 10 and the bottom plate of the kettle body 1; the inner top of the sleeve 10 is provided with a baffle 11, a sun gear 12, a planetary gear 13 and a ring gear 14, and the ring gear 14, the sun gear 12 and the planetary gear 13 are all located above the baffle 11; the sun gear 12 is coaxially fixedly connected to the bottom end of the stirring shaft 6, and the bottom end of the sun gear 12 is rotatably connected to a column 15, the bottom end of the column 15 is fixedly connected to the bottom plate of the kettle body 1, the baffle 11 is fixedly sleeved on the column 15, and the baffle 11 and the sleeve 10 are slidably matched; The ring gear 14 is fixedly connected to the top inner wall of the sleeve 10, the ring gear 14 is coaxially arranged with the sun gear 12, the planetary gear 13 is arranged between the ring gear 14 and the sun gear 12, the planetary gear 13 is rotatably connected to the baffle 11, the planetary gear 13 is meshed with the ring gear 14, and the planetary gear 13 is meshed with the sun gear 12; an auger blade 16 is arranged below the baffle 11, the auger blade 16 is fixedly connected to the inner wall of the sleeve 10, and the auger blade 16 is slidably matched with the column 15; a discharge port 17 is opened on the side wall of the sleeve 10, the top of the discharge port 17 is flush with the bottom end of the baffle 11, and the scraper 5 is fixedly connected to the bottom of the outer wall of the sleeve 10.

[0035] When in use, the sun gear 12 is driven to rotate by the rotation of the stirring shaft 6, and the sun gear 12 drives the ring gear 14 and the sleeve 10 to rotate through the planetary gear 13. When the sleeve 10 rotates, the bottom auger blade 16 and the scraper 5 rotate, and the scraper 5 is used to gather the raw materials deposited at the bottom of the kettle body 1 to the middle of the kettle body 1, and the rotating auger blade 16 is used to lift the raw materials in the sleeve 10 and discharge them through the discharge port 17, which helps to improve the mixing efficiency of the raw materials.

[0036] According to a further optimized solution, in order to facilitate the gathering of the raw materials deposited at the bottom of the kettle body 1 to the middle of the kettle body 1 , the scraper 5 is an arc-shaped structure.

[0037] According to a further optimized solution, a support leg 18 is fixedly connected to the bottom end of the kettle body 1 .

[0038] The process for producing high-purity disodium ethylenediaminetetraacetate by using the reaction kettle for preparing high-purity disodium ethylenediaminetetraacetate provided by the present invention comprises the following steps:

[0039] The first step is raw material preparation; the raw materials for preparing disodium ethylenediaminetetraacetate include ethylenediamine, tetraacetic acid, hydrogen peroxide, sodium hydroxide and nitric acid, wherein ethylenediamine is solid and tetraacetic acid is liquid;

[0040] The second step is to prepare tetraacetic anhydride; tetraacetic acid is added into a reaction kettle, heated to about 100°C, and hydrogen peroxide is added as a catalyst, and reacted for 3-4 hours under an oxygen atmosphere to obtain tetraacetic anhydride;

[0041] The third step is to prepare ethylenediaminetetraacetic acid; tetraacetic anhydride and ethylenediamine are mixed in a ratio of 1:1.3, heated to 180-200°C, and reacted for 2-3 hours; the reactants will undergo a water removal reaction during the heating process to form ethylenediaminetetraacetic acid; after the reaction is completed, the product is cooled and added with sodium hydroxide solution for neutralization to obtain a preliminary product of disodium ethylenediaminetetraacetic acid;

[0042] The fourth step is purification; the preliminary product is dissolved in water and filtered to obtain a filtrate; nitric acid is added to the filtrate to adjust the pH value to about 8.0, and then sodium carbonate solution is slowly added until a white precipitate is generated, and then the steps of reaction, precipitation, filtration, etc. are performed to finally obtain pure disodium ethylenediaminetetraacetic acid.

[0043] The above are only preferred specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A reaction kettle for preparing high-purity disodium ethylenediaminetetraacetate, characterized in that: The invention comprises a kettle body (1), wherein a feed hopper (2) is arranged at the top end of the kettle body (1), a discharge pipe (3) is arranged at the bottom end of the kettle body (1), a stirring mechanism is arranged inside the kettle body (1), a motor (4) is fixedly installed at the middle part of the top end of the kettle body (1), and the motor (4) is in driving cooperation with the stirring mechanism; a suction mechanism is drivingly connected to the bottom end of the stirring mechanism, a scraper (5) is fixed on the outer wall of the suction mechanism, and the scraper (5) is in sliding cooperation with the bottom plate of the kettle body (1); and a heating component is arranged at the bottom end of the kettle body (1).

2. The reaction kettle for preparing high-purity disodium ethylenediaminetetraacetate according to claim 1, characterized in that: The stirring mechanism comprises a stirring shaft (6) arranged in the kettle body (1), the top end of the stirring shaft (6) being drivingly connected to the output shaft of the motor (4); a plurality of stirring rods (7) are fixedly connected to the stirring shaft (6), and the stirring rods (7) are arranged in a vertical direction; and the suction mechanism is installed at the bottom end of the stirring shaft (6).

3. The reaction kettle for preparing high-purity disodium ethylenediaminetetraacetate according to claim 2, characterized in that: A plurality of crushing teeth (8) are fixedly connected to the top end of the stirring rod (7), and the crushing teeth (8) are arranged at equal intervals along the length direction of the stirring rod (7).

4. The reaction kettle for preparing high-purity disodium ethylenediaminetetraacetate according to claim 3, characterized in that: One side of the stirring rod (7) is a triangular structure, and the other side of the stirring rod (7) is a concave arc structure.

5. The reaction kettle for preparing high-purity disodium ethylenediaminetetraacetate according to claim 4, characterized in that: The stirring rod (7) is provided with a plurality of through holes (9), the through holes (9) are arranged in a horizontal direction, and a crushing tooth (8) is arranged between two adjacent through holes (9).

6. The reaction kettle for preparing high-purity disodium ethylenediaminetetraacetate according to claim 5, characterized in that: The aperture of the through hole (9) at one end of the triangular structure of the stirring rod (7) is smaller than the aperture of the through hole (9) at one end of the concave arc structure of the stirring rod (7).

7. The reaction kettle for preparing high-purity disodium ethylenediaminetetraacetate according to claim 2, characterized in that: The suction mechanism comprises a sleeve (10), the sleeve (10) being slidably sleeved on the bottom of the stirring shaft (6), and a gap being arranged between the bottom end of the sleeve (10) and the bottom plate of the kettle body (1); a baffle (11), a sun gear (12), a planetary gear (13) and a gear ring (14) are arranged on the inner top of the sleeve (10), and the gear ring (14), the sun gear (12) and the planetary gear (13) are all located above the baffle (11); the sun gear (12) is coaxially fixedly connected to the bottom end of the stirring shaft (6), the bottom end of the sun gear (12) is rotatably connected to a column (15), the bottom end of the column (15) is fixedly connected to the bottom plate of the kettle body (1), the baffle (11) is fixedly sleeved on the column (15), and the baffle (11) and the sleeve (10) are slidably matched; the gear ring (14) is fixedly The sleeve (10) is fixedly connected to the top inner wall of the sleeve (10), the gear ring (14) is coaxially arranged with the sun gear (12), the planetary gear (13) is arranged between the gear ring (14) and the sun gear (12), the planetary gear (13) is rotatably connected to the baffle (11), the planetary gear (13) is meshed with the gear ring (14), and the planetary gear (13) is meshed with the sun gear (12); an auger blade (16) is arranged below the baffle (11), the auger blade (16) is fixedly connected to the inner wall of the sleeve (10), and the auger blade (16) is slidably matched with the column (15); a discharge port (17) is opened on the side wall of the sleeve (10), the top end of the discharge port (17) is flush with the bottom end of the baffle (11), and the scraper (5) is fixedly connected to the bottom of the outer wall of the sleeve (10).

8. The reaction kettle for preparing high-purity disodium ethylenediaminetetraacetate according to claim 7, characterized in that: The scraper (5) is an arc-shaped structure.

9. The reaction kettle for preparing high-purity disodium ethylenediaminetetraacetate according to claim 1, characterized in that: A support leg (18) is fixedly connected to the bottom end of the kettle body (1).

Images