A sodium diacetate crystallization apparatus

Abstract

This utility model discloses a sodium diacetate crystallization device, comprising an inner tank and an outer tank surrounding the inner tank, with a space between the inner and outer tanks. The outer tank has a heating medium inlet and a heating medium outlet communicating with the space. An electric heating rod is installed within the space. The top of the inner tank is covered with a tank cover, and a feed pipe is installed on the tank cover. An anchor-type paddle and a slanted blade paddle are installed inside the inner tank. Multiple longitudinally extending strip-shaped baffles are installed on the inner wall of the inner tank. A spiral cooling coil and a thermometer sleeve are also installed inside the inner tank, with a temperature sensor installed inside the thermometer sleeve. A discharge pipe is installed at the bottom of the inner tank, and a discharge valve is installed on the discharge pipe. This utility model has a simple structure, low cost, low manufacturing and maintenance costs, is suitable for small-scale production operations, can achieve rapid and uniform cooling, significantly shorten the crystallization cycle, and form high-quality crystals while reducing agglomeration.

Description

Technical Field

[0001] This utility model relates to the field of sodium diacetate production technology, and in particular to a sodium diacetate crystallization apparatus. Background Technology

[0002] Sodium diacetate requires evaporation and crystallization during processing. Traditional container crystallization methods involve natural cooling in ordinary open containers, which results in slow and uneven cooling rates, long crystallization times, and a tendency for clumping. Existing large-scale industrial crystallizers are complex and expensive, making them unsuitable for small-batch production. Meanwhile, simple constant-temperature water bath methods lack efficient internal cooling and stirring integration, leading to low crystallization efficiency and poor quality. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a sodium diacetate crystallization device, which aims to solve the technical problems of existing large industrial crystallizers being complex in structure, expensive, unsuitable for small-batch production operations, and having low crystallization efficiency and poor quality in constant temperature water baths.

[0004] The technical solution of this utility model is: a sodium diacetate crystallization device, comprising an inner tank and an outer tank surrounding the inner tank, with a space between the inner tank and the outer tank. The outer tank is provided with a heating medium inlet and a heating medium outlet communicating with the space. An electric heating rod is provided in the space. The top of the inner tank is provided with a tank cover, and a feed pipe is provided on the tank cover. An anchor-type paddle and a slanted blade paddle are provided inside the inner tank. Multiple longitudinally extending strip baffles are provided on the inner wall of the inner tank. The inner tank is also provided with a spiral cooling coil and a thermometer sleeve, with a temperature sensor inside the thermometer sleeve. A discharge pipe is provided at the bottom of the inner tank, and a discharge valve is provided on the discharge pipe.

[0005] Furthermore, in this utility model, the anchor paddle is disposed at the bottom of the inner tank, the anchor paddle is connected to the first motor through the first rotating shaft, the first motor is installed on the top of the tank cover, and a scraper is provided on the outer side of the paddle blade of the anchor paddle, the scraper contacting the inner wall of the inner tank.

[0006] Furthermore, the present invention has two oblique blades, which are mounted one above the other on a second rotating shaft. The second rotating shaft is driven to rotate by a second motor, which is mounted on the top of the can cover.

[0007] Furthermore, in this utility model, multiple strip-shaped baffles are evenly arranged around the center of the inner tank, and the strip-shaped baffles are made of 316L stainless steel.

[0008] Furthermore, in this utility model, the spiral cooling coil is disposed in the space between the anchor propeller and the inclined blade propeller, and the two ends of the spiral cooling coil are a cooling water inlet and a cooling water outlet, respectively, and the cooling water inlet and the cooling water outlet extend out of the tank cover to the outside.

[0009] Furthermore, the surface of the spiral cooling coil described in this invention is coated with a Teflon coating.

[0010] Furthermore, in this utility model, the thermometer sleeve is fixedly installed on the can lid, and the lower end of the thermometer sleeve extends into the lower middle part of the inner can.

[0011] Furthermore, the discharge valve described in this utility model is a fluoropolymer-lined valve.

[0012] Compared with the prior art, this utility model has the following advantages: the utility model has a simple structure, low cost, low manufacturing and maintenance costs, and is suitable for small-scale production operations; the heating medium in the interlayer space, together with the electric heating rod, can achieve uniform heating, and the built-in spiral cooling coil can provide a large heat exchange area and forced convection. Combined with controllable stirring, it can achieve rapid and uniform cooling, significantly shorten the crystallization cycle, and is conducive to the formation of better quality crystals and reduce agglomeration. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram showing the specific arrangement of the anchor propeller and the oblique blade propeller described in this utility model.

[0015] The components are as follows: 1. Inner tank; 1a. Discharge pipe; 2. Outer tank; 2a. Heating medium inlet; 2b. Heating medium outlet; 3. Interlayer space; 4. Electric heating rod; 5. Tank cover; 5a. Feed pipe; 6. Anchor paddle; 7. Inclined blade paddle; 8. Strip baffle; 9. Spiral cooling coil; 9a. Cooling water inlet; 9b. Cooling water outlet; 10. Thermometer sleeve; 11. Discharge valve; 12. First rotating shaft; 13. First motor; 14. Scraper; 15. Second rotating shaft; 16. Second motor. Detailed Implementation

[0016] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0017] Example:

[0018] The accompanying drawings illustrate a specific embodiment of a sodium diacetate crystallization apparatus according to this invention. Figure 1It mainly includes an inner tank 1, which is used to hold sodium diacetate solution. The inner tank 1 can be made of borosilicate glass or 304 stainless steel, which has corrosion resistance. The bottom of the inner tank 1 is hemispherical, which facilitates stirring and crystal sedimentation.

[0019] The inner tank 1 is enclosed by an outer tank 2, with a space 3 between them. The outer tank 2 can be made of heat-resistant glass, stainless steel, or heat-resistant plastic. The outer tank 2 has a heating medium inlet 2a and a heating medium outlet 2b that communicate with the space 3. The space 3 is used to fill the heating medium (such as water or heat transfer oil), and an electric heating rod 4 is installed within the space 3 to heat the heating medium to a specified temperature.

[0020] The inner tank 1 is equipped with a tank cover 5 on the top, and a feed pipe 5a is provided on the tank cover 5. Sodium diacetate is introduced into the inner tank 1 through the feed pipe 5a. The inner tank 1 is equipped with an anchor paddle 6 and an inclined blade paddle 7, which are used for low-speed stirring and medium-speed stirring, respectively.

[0021] Combination Figure 1 , Figure 2 An anchor paddle 6 is positioned at the bottom of the inner tank 1 and is connected to a first motor 13 via a first rotating shaft 12. The first motor 13 is mounted on the top of the tank cover 5. A scraper 14 is provided on the outer side of the anchor paddle 6 blades. The scraper 14 contacts the inner wall of the inner tank 1 to prevent crystals from adhering to the inner wall, and low-speed stirring promotes overall circulation. Preferably, the bottom of the anchor paddle 6 contacts the bottom wall of the inner tank 1, resulting in more thorough stirring.

[0022] There are two inclined blades 7, which are mounted vertically on a second rotating shaft 15. The second rotating shaft 15 is driven to rotate by a second motor 16, which is mounted on top of the tank cover 5. The two inclined blades 7 are used for medium-speed stirring, generating a strong axial flow and more vigorous mixing.

[0023] The inner wall of the inner tank 1 is provided with multiple longitudinally extending strip baffles 8, which are evenly arranged around the center of the inner tank 1. The strip baffles 8 are made of 316L stainless steel. The strip baffles 8 are used to disrupt the vortex flow pattern and improve mixing efficiency.

[0024] The inner tank 1 is equipped with a spiral cooling coil 9, which is located in the space between the anchor propeller 6 and the inclined blade propeller 7. The spiral cooling coil 9 has a cooling water inlet 9a and a cooling water outlet 9b at its two ends, respectively, extending out of the tank cover 5 to the outside. Cooling water enters through the cooling water inlet 9a, is transported from bottom to top, and exits through the cooling water outlet 9b, enhancing the heat exchange intensity at the bottom. The surface of the spiral cooling coil 9 is coated with a Teflon coating, which reduces crystal adhesion and facilitates cleaning.

[0025] The inner tank 1 is also equipped with a thermometer sleeve 10, which is fixedly installed on the tank cover 5. The lower end of the thermometer sleeve 10 extends into the lower middle part of the inner tank 1. A temperature sensor is installed inside the thermometer sleeve 10 to detect the stirring temperature.

[0026] The bottom of the inner tank 1 is provided with a discharge pipe 1a, and a discharge valve 11 is provided on the discharge pipe 1a. The discharge valve 11 is a fluoropolymer-lined valve.

[0027] In practical operation, the sodium diacetate solution is introduced into the inner tank 1 through the feed pipe 5a. Heating medium (water or heat transfer oil) is injected into the jacket space 3 through the heating medium inlet 2a. The electric heating rod 4 is turned on to heat to the set temperature. During heating, the first motor 13 is activated to drive the anchor paddle 6 to stir at low speed until completely dissolved. Then, the temperature is maintained, and the second motor 16 is turned on to drive the two inclined blade paddles 7 to stir at medium speed for a period of time. Next, the electric heating rod 4 stops heating, and cooling water is introduced into the spiral cooling coil 9 to cool the material. The temperature is monitored by a temperature sensor inside the thermometer sleeve 10. Initially, when the temperature is high, both paddles operate simultaneously. As the temperature gradually decreases, the speed of the inclined blade paddles 7 is reduced, while the anchor paddle 6 stirs synchronously. Finally, only the anchor paddle 6 performs low-speed stirring, thus achieving rapid and uniform heat dissipation while reducing crystal breakage, which is beneficial for forming higher-quality crystals and reducing agglomeration. Finally, the crystal material can be discharged through the discharge pipe 1a by opening the discharge valve 11.

[0028] Of course, the above embodiments are only for illustrating the technical concept and features of this utility model, and their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All modifications made in accordance with the spirit and essence of the main technical solution of this utility model should be covered within the protection scope of this utility model.

Claims

1. A sodium diacetate crystallization apparatus, characterized by: The device includes an inner tank (1) and an outer tank (2) that surrounds the inner tank (1). There is a space (3) between the inner tank (1) and the outer tank (2). The outer tank (2) is provided with a heating medium inlet (2a) and a heating medium outlet (2b) that communicate with the space (3). An electric heating rod (4) is provided in the space (3). The top of the inner tank (1) is provided with a tank cover (5). The tank cover (5) is provided with a feed pipe (5a). The interior of the inner tank (1) is provided with an anchor paddle (6) and a slanted blade paddle (7). The inner wall of the inner tank (1) is provided with multiple longitudinally extending strip baffles (8). The interior of the inner tank (1) is also provided with a spiral cooling coil (9) and a thermometer sleeve (10). The thermometer sleeve (10) is provided with a temperature detector. The bottom of the inner tank (1) is provided with a discharge pipe (1a). The discharge pipe (1a) is provided with a discharge valve (11).

2. A device for crystallizing sodium diacetate according to claim 1, characterized in that: The anchor paddle (6) is located at the bottom of the inner tank (1). The anchor paddle (6) is connected to the first motor (13) via the first rotating shaft (12). The first motor (13) is installed on the top of the tank cover (5). The outer side of the paddle blade of the anchor paddle (6) is provided with a scraper (14), which contacts the inner wall of the inner tank (1).

3. The sodium diacetate crystallization apparatus according to claim 2, characterized in that: The oblique blade (7) has two blades, which are mounted one above the other on the second rotating shaft (15). The second rotating shaft (15) is driven to rotate by the second motor (16), which is mounted on the top of the can cover (5).

4. The sodium diacetate crystallization apparatus according to claim 1, characterized in that: Multiple strip baffles (8) are evenly arranged around the center of the inner tank (1), and the strip baffles (8) are made of 316L stainless steel.

5. The sodium diacetate crystallization apparatus according to claim 1, characterized in that: The spiral cooling coil (9) is disposed in the space between the anchor propeller (6) and the inclined blade propeller (7). The two ends of the spiral cooling coil (9) are a cooling water inlet (9a) and a cooling water outlet (9b), respectively. The cooling water inlet (9a) and the cooling water outlet (9b) extend out of the tank cover (5) to the outside.

6. The sodium diacetate crystallization apparatus according to claim 5, characterized in that: The surface of the spiral cooling coil (9) is coated with Teflon.

7. The sodium diacetate crystallization apparatus according to claim 1, characterized in that: The thermometer sleeve (10) is fixedly installed on the can lid (5), and the lower end of the thermometer sleeve (10) extends into the lower middle part of the inner can (1).

8. The sodium diacetate crystallization apparatus according to claim 1, characterized in that: The discharge valve (11) is a fluoropolymer-lined valve.

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