Continuous production system for sodium diacetate

Abstract

The invention discloses a continuous production system for sodium diacetate. The continuous production system comprises a reaction kettle, a spiral conveyor, a cooling dryer and a vibration screening device which are connected in sequence, the reaction kettle is used for uniformly heating and cooling materials to form crystals with better quality, the sticky state of the materials can be changed by adding a small amount of pure water, and the process is easier to operate; the spiral conveyor conveys materials to the cooling dryer, the cooling dryer enables the materials to be in a loose state all the time through uniform cold and hot air and stirring, tail gas waste heat can be recycled, energy consumption is low, dust can be recycled, and therefore waste is reduced, and dust pollution is reduced. And the cooled and dried materials enter a vibration screening device, and qualified particles are automatically screened out. The process is easier to operate, raw materials react more completely, the crystallization period can be remarkably shortened, crystals with good quality are formed, caking is reduced, equipment energy consumption is low, waste is little, dust pollution can be reduced, and finally qualified particles are automatically screened out and convenient to package.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sodium diacetate production, in particular to a continuous production system of sodium diacetate. BACKGROUND

[0002] The production process of sodium diacetate includes two main processes of chemical synthesis and crystal generation, and the chemical synthesis reaction is generally a neutralization reaction of acetic acid and sodium carbonate at a certain temperature to obtain molecular associated compounds; the crystal generation process is to form crystals by precipitating molecular associated compounds during the cooling process.

[0003] At present, the production methods of sodium diacetate are various according to different raw materials, and the commonly used acetic acid-sodium carbonate method has a relatively short production process, but the reactants will gradually become sticky during the reaction, which leads to the difficulty of continuing the reaction, and the reaction is easy to be incomplete. The traditional production system uses a large industrial crystallizer, which has a complex structure and high cost, and is not suitable for small-batch production operations. When using static drying (such as an oven) or uneven airflow for drying, hard lumps are easily formed, which leads to the need for secondary crushing processing, and since sodium diacetate is easy to reabsorb moisture at high temperature, direct packaging will affect the product quality. The dry tail gas contains fine particles, and direct discharge will also cause waste and dust pollution. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a continuous production system of sodium diacetate, which aims to solve the technical problems in the prior art, such as the difficulty of traditional production process reaction, the use of large industrial crystallizers with complex structure and high cost, which is not suitable for small-batch production operations, and the material thermal sensitivity damage and serious caking during drying, which cannot guarantee the product quality, and also causes waste and dust pollution.

[0005] The technical scheme of the present application is: a continuous production system of sodium diacetate, comprising a reaction kettle, a screw conveyor, a cooling dryer and a vibrating screening device connected in sequence.

[0006] The reaction kettle comprises an inner tank and an outer tank wrapped outside the inner tank, and a sandwich space is formed between the inner tank and the outer tank, and an electric heating rod is arranged in the sandwich space; a liquid material inlet pipe, a solid material inlet pipe and a pure water inlet pipe are arranged at the top of the inner tank, and a stirring paddle and a spiral cooling coil are arranged in the inner tank; a discharge pipe is arranged at the bottom of the inner tank, and the discharge pipe is connected with the feeding end of the screw conveyor;

[0007] The discharge end of the screw conveyor is connected with the cooling dryer, the cooling dryer comprises a drying box, the drying box is sequentially provided with an upper drying area, a middle material dropping area and a lower cooling area from top to bottom, a discharging mechanism for isolating or connecting the two areas is arranged between the upper drying area and the middle material dropping area, and the upper drying area and the lower cooling area are respectively provided with an upper stirring mechanism and a lower stirring mechanism; the upper drying area is connected with a hot air supply system, the lower cooling area is connected with a cold air supply system, and the cold air supply system is communicated with the hot air supply system; the bottom of the drying box is further provided with a discharging mechanism, and the discharging mechanism is connected with the vibrating screening device.

[0008] Further, the outer tank is provided with a heating medium inlet and a heating medium outlet communicated with the interlayer space; the stirring paddle comprises an anchor paddle and an inclined paddle, the anchor paddle is connected with a first motor through a first rotating shaft, the outer side of the paddle blade of the anchor paddle is provided with a scraping plate, the scraping plate is in contact with the inner wall of the inner tank, and the inclined paddle is connected with a second motor through a second rotating shaft.

[0009] Further, the inner tank is provided with a thermometer sleeve, the thermometer sleeve is provided with a temperature detector, and the discharging pipe is provided with a discharging valve.

[0010] Further, the spiral cooling coil is arranged in the space between the anchor paddle and the inclined paddle, 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 respectively pass through the top of the inner tank to the outside.

[0011] Further, the top of the drying box is provided with a feeding bin, the feeding bin is connected with the discharge end of the screw conveyor, and the output end of the feeding bin is provided with an electromagnetic valve.

[0012] Further, the discharging mechanism comprises a lap joint boss arranged on the inner wall of the drying box, the middle part of the lap joint boss is provided with an opening, the bottom of the lap joint boss is rotationally connected with an opening and closing plate driven by an opening and closing motor through a fixing table, the opening and closing plate is provided with two and is symmetrically arranged, and the two opening and closing plates can cooperate to close or open the opening.

[0013] Further, the upper stirring mechanism comprises an upper stirring support driven by an upper stirring motor, the bottom of the upper stirring support is provided with a plurality of vertically arranged stirring rods and an edge stirring plate, the vertically arranged stirring rods are located in the opening, and the edge stirring plate is in contact with the upper surface of the lap joint boss; the lower stirring mechanism comprises a lower stirring support driven by a lower stirring motor, and the bottom of the lower stirring support is provided with a lower stirring plate, and the lower stirring plate is in contact with the bottom surface of the drying box.

[0014] Further, the bottom of the drying box is provided with a discharge port, the discharge mechanism comprises a receiving box provided at the discharge port, the outside of the receiving box is provided with a discharge cylinder, the inside of the receiving box is provided with a lifting frame driven to lift by the discharge cylinder, the lifting frame is provided with a sealing plug driven to rotate by a discharge motor, the sealing plug is matched with the discharge port, the outside of the receiving box is provided with a jolting mechanism, and the bottom of the receiving box is connected with the vibrating screening device through a hose.

[0015] Further, the hot air supply system comprises a first air inlet pipe, a blower, a steam heat exchanger and a hot air inlet pipe connected in sequence, and the two sides of the drying box are respectively provided with upper layer flow uniformizing plates communicated with the upper layer drying area, the upper layer flow uniformizing plate on one side is connected with the hot air inlet pipe, and the upper layer flow uniformizing plate on the other side is connected with a hot air outlet pipe and a bag-type dust collector in sequence, and the hot air outlet pipe is further provided with a moisture sensor.

[0016] Further, the cold air supply system comprises a second air inlet pipe, a fin pre-cooler, a fin evaporator and a cold air inlet pipe connected in sequence, and the two sides of the drying box are respectively provided with lower layer flow uniformizing plates communicated with the lower layer cooling area, the lower layer flow uniformizing plate on one side is connected with the cold air inlet pipe, and the lower layer flow uniformizing plate on the other side is connected with a filter and a fresh air preheating pipe in sequence, and the fresh air preheating pipe is connected with the first air inlet pipe.

[0017] Compared with the prior art, the present application has the following advantages:

[0018] 1) The present application adopts a small reaction kettle, which is simple in structure, low in cost, low in manufacturing and maintenance cost, suitable for small-scale production operation, can realize uniform heating by matching the heating medium with the electric heating rod, can provide large heat exchange area and forced convection by the built-in spiral cooling coil, and can realize rapid and uniform cooling by combining controllable stirring, thereby significantly shortening the crystallization period, being beneficial to forming high-quality crystals, and reducing caking;

[0019] 2) In the present application, by adding acetic acid in the reaction kettle first, then adding sodium carbonate, and finally adding a small amount of pure water, the viscosity state of the material can be changed, the process is more easy to operate, and the raw material reaction is more complete;

[0020] 3) In the present application, after the material enters the cooling dryer, the material can always be in a loose state by the uniform cold and hot air + stirring effect; the drying box integrates drying and cooling, which can ensure product quality, prevent packaging from absorbing moisture, and can also recycle waste heat, thereby reducing energy consumption; the high-temperature tail gas can also be dusted by the bag-type dust collector to realize dust recycling, thereby reducing waste and dust pollution;

[0021] 4)In the present application, the cooled and dried material enters the vibrating screening device, which can automatically screen out qualified particles for packaging. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present application;

[0023] Figure 2 It is a specific structural schematic diagram of the reaction kettle in the present application;

[0024] Figure 3 It is a specific structural schematic diagram of the stirring paddle in the present application;

[0025] Figure 4 It is a specific structural schematic diagram of the cooling and drying machine in the present application;

[0026] Figure 5 It is a specific structural schematic diagram of the discharging mechanism and the upper stirring mechanism in the present application;

[0027] Figure 6 It is a specific structural schematic diagram of the lower stirring mechanism and the discharging mechanism in the present application.

[0028] Among them:

[0029] 1, the reaction kettle; 101, the inner tank; 102, the outer tank; 102a, the heating medium inlet; 102b, the heating medium outlet; 103, the interlayer space; 104, the electric heating rod; 105, the liquid material inlet pipe; 106, the solid material inlet pipe; 107, the pure water inlet pipe; 108, the spiral cooling coil; 108a, the cooling water inlet; 108b, the cooling water outlet; 109, the discharge pipe; 109a, the discharge valve; 110, the anchor paddle; 111, the inclined blade paddle; 112, the first rotating shaft; 113, the first motor; 114, the scraper; 115, the second rotating shaft; 116, the second motor; 117, the thermometer sleeve;

[0030] 2, the screw conveyor;

[0031] 3, cooling dryer; 301, drying box; 301a, upper drying zone; 301b, middle material dropping zone; 301c, lower cooling zone; 301d, discharge port; 302, feeding bin; 302a, electromagnetic valve; 303, discharging mechanism; 304, upper stirring mechanism; 305, lower stirring mechanism; 306, hot air supply system; 306a, first air inlet pipe; 306b, air blower; 306c, steam heat exchanger; 306d, hot air inlet pipe; 306e, hot air outlet pipe; 306f, bag-type dust collector; 306g, moisture sensor; 307, cold air supply system; 307a, second air inlet pipe; 307b, finned pre-cooler; 307c, finned evaporator; 307d, cold air inlet pipe; 307e, filter; 307f, fresh air pre-heating pipe; 308, discharging mechanism; 309, upper flow uniformizing plate; 310, lower flow uniformizing plate;

[0032] 4, vibrating screening device;

[0033] 5, lapping boss; 5a, opening; 6, fixing table; 7, opening and closing plate; 8, upper stirring motor; 9, upper stirring support; 10, vertical stirring rod; 11, edge stirring plate; 12, lower stirring motor; 13, lower stirring support; 14, lower stirring plate; 15, receiving box; 16, discharging air cylinder; 17, lifting frame; 18, discharging motor; 19, sealing plug; 20, vibrating mechanism; 21, hose. DETAILED DESCRIPTION

[0034] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0035] Embodiment:

[0036] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. Figure 1 It mainly comprises a reaction kettle 1, a screw conveyor 2, a cooling dryer 3 and a vibrating screening device 4 connected in sequence.

[0037] In combination with Figure 1 , Figure 2 , Figure 3 The reaction kettle 1 specifically comprises an inner tank 101 and an outer tank 102 wrapped outside the inner tank 101, and has a sandwich space 103 between the inner tank 101 and the outer tank 102. The outer tank 102 is provided with a heating medium inlet 102a and a heating medium outlet 102b communicating with the sandwich space 103. The sandwich space 103 is used to fill the heating medium (such as water or heat-conducting oil), and the sandwich space 103 is provided with an electric heating rod 104 for heating the heating medium to a specified temperature.

[0038] The top of the inner tank 101 is provided with a liquid material inlet pipe 105, a solid material inlet pipe 106 and a pure water inlet pipe 107. The liquid material inlet pipe 105 is used for adding acetic acid, the solid material inlet pipe 106 is used for adding sodium carbonate, and the pure water inlet pipe 107 is used for adding pure water.

[0039] The inner tank 101 is provided with stirring paddles, including an anchor paddle 110 and an inclined blade paddle 111, which are used for low-speed stirring and medium-speed stirring, respectively. The anchor paddle 110 is arranged at the bottom of the inner tank 101, and the anchor paddle 110 is connected to a first motor 113 through a first rotating shaft 112. The first motor 113 is installed at the top of the inner tank 101. The outer side of the paddle of the anchor paddle 110 is provided with a scraping plate 114, which is in contact with the inner wall of the inner tank 101, and is used to prevent the crystal from adhering to the inner wall. The low-speed stirring of the anchor paddle 110 can promote overall circulation. Preferably, the bottom of the anchor paddle 110 is in contact with the bottom wall of the inner tank 101, so that the stirring is more sufficient.

[0040] The inclined blade paddle 111 has two, which are arranged on a second rotating shaft 115 in an up-down manner. The second rotating shaft 115 is driven to rotate by a second motor 116, and the second motor 116 is installed at the top of the inner tank 101. The inclined blade paddle 111 is used for medium-speed stirring, and generates strong axial flow, so that the mixing is more intense.

[0041] The inner tank 101 is provided with a spiral cooling coil 108, which is arranged in the space between the anchor paddle 110 and the inclined blade paddle 111. The two ends of the spiral cooling coil 108 are a cooling water inlet 108a and a cooling water outlet 108b, respectively. The cooling water inlet 108a and the cooling water outlet 108b respectively pass out of the top of the inner tank 101 to the outside. The cooling water is fed from the cooling water inlet 108a, transported from bottom to top, and discharged from the cooling water outlet 108b, which can enhance the heat exchange intensity of the bottom of the inner tank 101.

[0042] The inner tank 101 is provided with a thermometer sleeve 117, the lower end of which extends into the middle and lower part of the inner tank 101. The thermometer sleeve 117 is provided with a temperature detector for detecting the stirring temperature.

[0043] The bottom of the inner tank 101 is provided with a discharge pipe 109, which is provided with a discharge valve 109a. The discharge pipe 109 is connected to the feeding end of the screw conveyor 2.

[0044] When the reaction kettle 1 is working, acetic acid is first added through the liquid material inlet pipe 105, and under stirring, sodium carbonate is slowly added through the solid material inlet pipe 106. After a period of reaction, the material is difficult to stir, and a small amount of pure water is added through the pure water inlet pipe 107 to change the viscosity of the material, so that the process is more easy to operate, and the raw materials are more completely reacted. During the reaction process, heating medium (water or heat conducting oil) is injected into the interlayer space 103 through the heating medium inlet 102a, the electric heating rod 104 is turned on, and the temperature is heated to the set temperature. When heating, the first motor 113 is turned on to drive the anchor paddle 110 to stir at low speed until the material is completely dissolved, and then the temperature is maintained. The second motor 116 is turned on to drive the two inclined blade paddles 111 to stir at medium speed for a period of time. Then the electric heating rod 104 stops heating, and the cooling water is passed into the spiral cooling coil 108 to cool the material. The temperature is monitored by the temperature detection meter in the thermometer sleeve 117. When the initial temperature is high, the double paddles run at the same time. As the temperature gradually decreases, the speed of the inclined blade paddle 111 can be reduced, and the anchor paddle 110 is synchronously stirred. Finally, only the anchor paddle 110 is used for low-speed stirring, so that rapid and uniform heat dissipation can be realized while reducing crystal breakage, which is beneficial to the formation of high-quality crystals and reduces caking. Finally, the discharge valve 109a is opened, and the crystal material is discharged into the screw conveyor 2 through the discharge pipe 109.

[0045] In combination Figure 1 , Figure 4 , the discharge end of the screw conveyor 2 is connected with the cooling and drying machine 3, and the material in the screw conveyor 2 is conveyed to the cooling and drying machine 3 for further cooling and drying. The cooling and drying machine 3 specifically comprises a drying box 301, and the top of the drying box 301 is provided with a feeding bin 302 connected with the discharge end of the screw conveyor 2. The output end of the feeding bin 302 is provided with an electromagnetic valve 302a. When the electromagnetic valve 2a is opened, the material in the feeding bin 302 enters the drying box 301.

[0046] The drying box 301 is sequentially provided with an upper drying area 301a, a middle layer material falling area 301b and a lower cooling area 301c from top to bottom. The upper drying area 301a and the middle layer material falling area 301b are provided with a discharging mechanism 303 for isolating or communicating the two areas. Figure 5 In combination

[0047] After the material falls into the drying chamber 301, it is received by the overlapping boss 5 and the opening and closing plate 7. Then the material can be dried. After drying, the opening and closing plate 7 is driven to rotate downward by the opening and closing motor, so that the material falls into the lower cooling zone 301c through the middle material dropping area 301b. Then the material can be cooled.

[0048] The upper drying zone 301a is equipped with an upper stirring mechanism 304, combined with Figure 4 , Figure 5 The upper stirring mechanism 304 includes an upper stirring bracket 9 driven by an upper stirring motor 8. The upper stirring motor 8 is installed on the top of the drying chamber 301, and the output shaft of the upper stirring motor 8 passes through the drying chamber 301 and is connected to the upper stirring bracket 9. The bottom of the upper stirring bracket 9 is provided with a plurality of spaced vertical stirring rods 10 and an edge stirring plate 11. The vertical stirring rods 10 are located in the opening 5a, and there is a gap between the vertical stirring rods 10 and the opening and closing plate 7. The vertical stirring rods 10 can play the main role in stirring the material. The edge stirring plate 11 contacts the upper surface of the overlapping protrusion 5, which can realize the auxiliary stirring of the material and the cleaning function of the edge material, sweeping the edge material off.

[0049] The lower cooling zone 301c is equipped with a lower stirring mechanism 305, combined with Figure 4 , Figure 6 The lower stirring mechanism 305 includes a lower stirring support 13 driven by a lower stirring motor 12. The lower stirring motor 12 is installed at the bottom of the drying chamber 301, and the output shaft of the lower stirring motor 12 passes through the drying chamber 301 and is connected to the lower stirring support 13. A lower stirring plate 14 is provided at the bottom of the lower stirring support 13. The lower stirring plate 14 contacts the bottom surface of the drying chamber 301, which can realize the stirring and cleaning function of the material and discharge the material from the drying chamber 301.

[0050] Combination Figure 4 The upper drying zone 301a is connected to a hot air supply system 306, which includes a first air inlet pipe 306a, a blower 306b, a steam heat exchanger 306c, and a hot air inlet pipe 306d connected in sequence. Upper flow equalization plates 309, connected to the upper drying zone 301a, are provided on both sides of the drying chamber 301. One upper flow equalization plate 309 is connected to the hot air inlet pipe 306d, and the other upper flow equalization plate 309 is connected in sequence to a hot air outlet pipe 306e and a bag filter 306f. A moisture sensor 306g is also installed on the hot air outlet pipe 306e.

[0051] Air is drawn into the steam heat exchanger 306c by the first air inlet pipe 306a via the air blower 306b and heated to a specified temperature. The hot air is blown into the upper drying area 301a through the hot air inlet pipe 306d under the action of the upper uniform flow plate 309. The material is fully dried under the stirring of the upper stirring mechanism 304. The hot air containing moisture is discharged into the bag dust collector 306f through the hot air outlet pipe 306e via the upper uniform flow plate 309 on the other side. The moisture sensor 306g detects the moisture content. When the moisture content is too high, the hot air temperature can be increased. When the moisture content meets the standard, the material drying is completed, and the discharge mechanism 303 can be opened to release the material to the lower cooling area 301c for subsequent cooling. The high-temperature tail gas discharged from the upper drying area 301a is dusted by the bag dust collector 306f to realize dust recovery. The recovered dust can be returned to the drying box 301 for reuse or collected and treated to reduce waste and dust pollution.

[0052] The lower cooling area 301c is connected with the cold air supply system 307, which includes the second air inlet pipe 307a, the fin pre-cooler 307b, the fin evaporator 307c, and the cold air inlet pipe 307d connected in sequence. The drying box 301 is provided with the lower uniform flow plate 310 on both sides, which is in communication with the lower cooling area 301c. The lower uniform flow plate 310 on one side is connected with the cold air inlet pipe 307d, and the lower uniform flow plate 310 on the other side is connected with the filter 307e and the fresh air preheating pipe 307f in sequence. The fresh air preheating pipe 307f is connected with the first air inlet pipe 306a.

[0053] Air is pre-cooled by the fin pre-cooler 307b after entering the fin evaporator 307c to remove moisture. The dehumidified cold air is blown into the lower cooling area 301c through the cold air inlet pipe 307d under the action of the lower uniform flow plate 310. The material is fully cooled under the stirring of the lower stirring mechanism 305. The exhaust air after heat exchange in the lower cooling area 301c is filtered by the filter 307e after passing through the lower uniform flow plate 310 on the other side. The filtered air is discharged into the first air inlet pipe 306a through the fresh air preheating pipe 307f for mixing and preheating. The waste heat is recovered and utilized, which can significantly reduce energy consumption compared with full fresh air heating.

[0054] The drying box 301 is also provided with a discharge mechanism 308 connected with the vibrating screen device 4. Figure 4 、 Figure 6The bottom of the drying box 301 is provided with a discharge port 301d, and the discharge mechanism 308 comprises a receiving box 15 arranged at the discharge port 301d, an external discharge cylinder 16 arranged at the receiving box 15, an internal lifting frame 17 driven by the discharge cylinder 16, and a sealing plug 19 driven by a discharge motor 18 and arranged on the lifting frame 17.

[0055] After the material is cooled, the discharge cylinder 16 is started to drive the lifting frame 17 to descend, so that the sealing plug 19 is separated from the discharge port 301d, and then the sealing plug 19 is rotated to one side to avoid the material by the discharge motor 18, and under the action of the lower stirring mechanism 305, the material is swept to fall into the receiving box 15 from the discharge port 301d.

[0056] The receiving box 15 is provided with a knocking mechanism 20, and the bottom of the receiving box 15 is connected with the vibrating screening device 4 through a hose 21. The material in the receiving box 801 falls into the vibrating screening device 4 through the hose 21 under the knocking of the knocking mechanism 20, and the vibrating screening device 4 automatically screens the qualified particles from the material, so that the material is convenient for packaging.

[0057] Of course, the above-mentioned embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any modification made according to the spirit and essence of the main technical solution of the present application should be covered within the protection scope of the present application.

Claims

1. A continuous production system for sodium diacetate, characterized in that: It includes a reaction vessel (1), a screw conveyor (2), a cooling dryer (3), and a vibrating screen (4) connected in sequence; The reactor (1) includes an inner tank (101) and an outer tank (102) that surrounds the inner tank (101). There is a sandwich space (103) between the inner tank (101) and the outer tank (102). An electric heating rod (104) is provided in the sandwich space (103). The top of the inner tank (101) is provided with a liquid material inlet pipe (105), a solid material inlet pipe (106), and a pure water inlet pipe (107). The inner tank (101) is provided with a stirring paddle and a spiral cooling coil (108). The bottom of the inner tank (101) is provided with a discharge pipe (109), which is connected to the feed end of the screw conveyor (2). The discharge end of the screw conveyor (2) is connected to the cooling dryer (3). The cooling dryer (3) includes a drying chamber (301). The drying chamber (301) is provided with an upper drying zone (301a), a middle material discharge zone (301b), and a lower cooling zone (301c) from top to bottom. A discharge mechanism (303) for isolating or connecting the two zones is provided between the upper drying zone (301a) and the middle material discharge zone (301b). The upper stirring mechanism (304) and the lower stirring mechanism (305) are respectively provided in the drying zone (301c); the upper drying zone (301a) is connected to the hot air supply system (306), and the lower cooling zone (301c) is connected to the cold air supply system (307). The cold air supply system (307) is connected to the hot air supply system (306); the bottom of the drying box (301) is also provided with a discharge mechanism (308), which is connected to the vibrating screen device (4).

2. The continuous production system for sodium diacetate according to claim 1, characterized in that: The outer tank (102) is provided with a heating medium inlet (102a) and a heating medium outlet (102b) communicating with the interlayer space (103); the stirring paddle includes an anchor paddle (110) and an inclined blade paddle (111). The anchor paddle (110) is connected to a first motor (113) through a first rotating shaft (112). The outer side of the blade of the anchor paddle (110) is provided with a scraper (114). The scraper (114) contacts the inner wall of the inner tank (101). The inclined blade paddle (111) is connected to a second motor (116) through a second rotating shaft (115).

3. The continuous production system for sodium diacetate according to claim 1, characterized in that: The inner tank (101) is equipped with a thermometer sleeve (117), the thermometer sleeve (117) is equipped with a temperature detector, and the discharge pipe (109) is equipped with a discharge valve (109a).

4. The continuous production system for sodium diacetate according to claim 2, characterized in that: The spiral cooling coil (108) is disposed in the space between the anchor propeller (110) and the inclined blade propeller (111). The two ends of the spiral cooling coil (108) are a cooling water inlet (108a) and a cooling water outlet (108b), respectively. The cooling water inlet (108a) and the cooling water outlet (108b) extend out of the top of the inner tank (101) to the outside.

5. A continuous production system for sodium diacetate according to claim 1, characterized in that: The top of the drying chamber (301) is provided with a feeding bin (302), which is connected to the discharge end of the screw conveyor (2). The output end of the feeding bin (302) is provided with a solenoid valve (302a).

6. The continuous production system for sodium diacetate according to claim 1, characterized in that: The feeding mechanism (303) includes a ring of overlapping protrusions (5) on the inner wall of the drying box (301). The overlapping protrusions (5) have an opening (5a) in the middle. The bottom of the overlapping protrusions (5) is rotatably connected to an opening and closing plate (7) driven by an opening and closing motor through a fixed platform (6). There are two opening and closing plates (7) arranged symmetrically. The two opening and closing plates (7) can cooperate to close or open the opening (5a).

7. A continuous production system for sodium diacetate according to claim 6, characterized in that: The upper stirring mechanism (304) includes an upper stirring bracket (9) driven by an upper stirring motor (8). The bottom of the upper stirring bracket (9) is provided with a plurality of spaced vertical stirring rods (10) and an edge stirring plate (11). The vertical stirring rods (10) are located inside the opening (5a). The edge stirring plate (11) is in contact with the upper surface of the overlapping boss (5). The lower stirring mechanism (305) includes a lower stirring bracket (13) driven by a lower stirring motor (12). The bottom of the lower stirring bracket (13) is provided with a lower stirring plate (14). The lower stirring plate (14) is in contact with the bottom surface of the drying oven (301).

8. A continuous production system for sodium diacetate according to claim 7, characterized in that: The drying box (301) has a discharge port (301d) at the bottom. The discharge mechanism (308) includes a receiving box (15) located at the discharge port (301d). The receiving box (15) has a discharge cylinder (16) on its exterior. The receiving box (15) has a lifting frame (17) driven to rise and fall by the discharge cylinder (16) inside. The lifting frame (17) has a sealing plug (19) driven to rotate by the discharge motor (18). The sealing plug (19) is adapted to the discharge port (301d). The receiving box (15) has a vibrating mechanism (20) on its exterior. The bottom of the receiving box (15) is connected to the vibrating screening device (4) through a hose (21).

9. A continuous production system for sodium diacetate according to claim 1, characterized in that: The hot air supply system (306) includes a first air inlet pipe (306a), a blower (306b), a steam heat exchanger (306c), and a hot air inlet pipe (306d) connected in sequence. The drying box (301) is provided with upper flow equalization plates (309) on both sides, which are connected to the upper drying zone (301a). The upper flow equalization plate (309) on one side is connected to the hot air inlet pipe (306d), and the upper flow equalization plate (309) on the other side is connected in sequence to a hot air outlet pipe (306e) and a bag filter (306f). A moisture sensor (306g) is also provided on the hot air outlet pipe (306e).

10. A continuous production system for sodium diacetate according to claim 1, characterized in that: The cold air supply system (307) includes a second air inlet pipe (307a), a finned precooler (307b), a finned evaporator (307c), and a cold air inlet pipe (307d) connected in sequence. The drying box (301) is provided with a lower flow equalization plate (310) on both sides, which is connected to the lower cooling zone (301c). The lower flow equalization plate (310) on one side is connected to the cold air inlet pipe (307d), and the lower flow equalization plate (310) on the other side is connected to a filter (307e) and a fresh air preheating pipe (307f) in sequence. The fresh air preheating pipe (307f) is connected to the first air inlet pipe (306a).

Images