Cooling crystallization method and equipment for azelaic acid

Abstract

The invention relates to the technical field of azelaic acid processing, in particular to an azelaic acid cooling crystallization method and equipment, the azelaic acid cooling crystallization equipment comprises a bearing table, a mounting rack, a servo motor, a fixing frame, a reaction kettle, a feeding port and a discharging port, the mounting rack is fixedly mounted on the upper surface of the bearing table, the servo motor is fixedly mounted on one side of the mounting rack, and the fixing frame is fixedly mounted on the other side of the mounting rack; the fixed frame is fixedly mounted on an output shaft of the servo motor, the reaction kettle is fixedly mounted on the inner side of the fixed frame, the feed port is formed in the upper side of the reaction kettle, and the discharge port is formed in the lower side of the reaction kettle. The n-octane layer and the azelaic acid crystallization layer can be sent out from the two outlets through cooperation with the impurity removal assembly, impurities in the n-octane layer on a phase interface are prevented from making contact with an azelaic acid aqueous solution, and the purity of azelaic acid crystallization is improved.

Description

Technical Field

[0001] The invention relates to the technical field of azelaic acid processing, and in particular to a method and equipment for cooling and crystallizing azelaic acid. Background Art

[0002] Azelaic acid is an organic compound that appears as white to slightly yellow monoclinic prisms, needle-shaped crystals or powder. It is used as a plasticizer and in alkyd resins, paints and chemical synthesis.

[0003] During the processing of azelaic acid, the crude azelaic acid needs to be cooled and crystallized for purification to obtain the fine product. During the cooling and crystallization process, the crude azelaic acid and the reaction medium need to be heated, stirred, extracted, separated and cooled and crystallized. However, during the separation process, black impurities will precipitate downward between the interface between the upper n-octane layer and the lower azelaic acid aqueous solution, which can easily be mixed in the finished azelaic acid crystallization product and affect its purity. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a method and equipment for cooling and crystallizing azelaic acid, which solves the problems raised in the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a nonanedioic acid cooling crystallization device, including a bearing platform, a mounting frame, a servo motor, a fixed frame, a reactor, a feed port and a discharge port, the mounting frame is fixedly mounted on the upper surface of the bearing platform, the servo motor is fixedly mounted on one side of the mounting frame, the fixed frame is fixedly mounted on the output shaft of the servo motor, the reactor is fixedly mounted on the inner side of the fixed frame, the feed port is opened on the upper side of the reactor, the discharge port is opened on the lower side of the reactor, the feed port and the discharge port are both provided with seals, a stirring assembly is provided on the mounting frame, the stirring assembly includes a first bevel gear, the first bevel gear is fixedly mounted on one side of the mounting frame, and is in active contact with the output shaft of the servo motor, the upper side of the first bevel gear is meshed with a second bevel gear, and the second bevel gear is movably mounted on the inner side of the fixed frame;

[0006] A first rotating wheel is fixedly installed in the middle part above the second bevel gear, a first transmission belt is transmission-connected to the outer surface of the first rotating wheel, a side of the first transmission belt away from the first rotating wheel is transmission-connected to the second rotating wheel, a first rotating rod is fixedly installed in the middle part of the lower surface of the second rotating wheel, a third rotating wheel is fixedly sleeved on the outer surface of the first rotating rod, a second transmission belt is transmission-connected to the outer surface of the third rotating wheel, and a side of the second transmission belt away from the second transmission belt is transmission-connected to the fourth rotating wheel;

[0007] A driving groove is opened on the upper side of the inner cavity of the fixed frame, and a first connecting member is movably installed in the driving groove. A gear ring is fixedly installed on the bottom of the first connecting member, and a first gear is meshed on the inner side of the gear ring. The number of the first gears is three, and they are evenly and equidistantly distributed on the inner side of the gear ring. A second gear is meshed on one side of the gear ring, and one of the second gears is fixedly connected to the fourth rotating wheel. A second rotating rod is fixedly installed in the middle of the second gear, and a stirring member is fixedly sleeved on the outer surface of the second rotating rod, and the stirring member is in the inner cavity of the reactor.

[0008] Optionally, a decrystalline assembly is provided on the stirring member, and the decrystalline assembly includes a return spring, the interior of the stirring member is hollow, and the return spring is fixedly connected to the inner cavity wall of the stirring member, the other end of the return spring is fixedly connected to an extension member, the extension member is movably installed between the stirring member, and a scraper is fixedly installed on one end of the extension member away from the return spring;

[0009] A slip ring is movably mounted on the outer surface of the second rotating rod, and second connecting members are fixedly connected to both sides of the outer surface of the slip ring. A scraper is fixedly connected to the bottom of the second connecting member, and the scraper is located on both sides of the stirring member and is in movably contact with the stirring member.

[0010] An elastic rope is fixedly connected to the outer surface of the first rotating rod, and a vibrating ball is fixedly connected to one end of the elastic rope away from the first rotating rod.

[0011] Optionally, the first rotating rod is provided with a debris removal component, the debris removal component includes a filter plate, the filter plate is movably mounted on the outer surface of the first rotating rod and movably mounted between the second rotating rod, and a limit block is fixedly mounted on the outer surface of the first rotating rod;

[0012] A collecting bin is fixedly mounted on the top of the fixing frame, an air extraction pump is fixedly mounted on the collecting bin, and a conduit is fixedly connected to one side of the collecting bin.

[0013] Optionally, first sliding blocks are fixedly mounted on both upper and lower sides of the extending member, and first sliding grooves adapted to the first sliding blocks are provided on both upper and lower sides of the inner cavity of the stirring member.

[0014] Optionally, second sliding blocks are fixedly mounted on both sides of the upper surface of the slip ring, and a second sliding groove matched with the second sliding block is formed on the surface of the second rotating rod.

[0015] Optionally, the radius of the second bevel gear is twice the radius of the first bevel gear, and the radius of the second gear is four times the radius of the first gear.

[0016] Optionally, the diameter above the reactor is smaller than the diameter below the reactor, and the inner diameter above the reactor is matched with the diameter of the filter plate.

[0017] A method for crystallizing azelaic acid by cooling, using the azelaic acid crystallization device as described above, comprising the following steps:

[0018] S1: First, the user puts the crude azelaic acid and the reaction medium into the inner cavity of the reactor, and starts the servo motor to drive the stirring element and the reactor to rotate, so as to stir the crude azelaic acid and the reaction medium;

[0019] S2: After the stirring is completed, the reactor needs to be placed in a vertical state to perform liquid separation. After the liquid separation is completed, the upper layer of liquid in the reactor can be extracted by starting the vacuum pump, so that the remaining liquid in the reactor can be cooled and crystallized;

[0020] S3: After cooling and crystallization, the crystals are collected through the discharge port, and then the servo motor is started again to drive the stirring element to rotate, so that the scraper scrapes the crystals on the surface of the inner cavity wall of the reactor to complete the comprehensive collection of the crystals.

[0021] The present invention provides a method and device for cooling and crystallizing azelaic acid, which has the following beneficial effects:

[0022] 1. The cooling crystallization method and equipment of azelaic acid can rotate the three first gears through the stirring component, and then the second rotating rod drives the stirring member to rotate to achieve stirring. The turning of the fixed frame can generate convection inside, which can accelerate the rapid fusion of the reaction substances and further improve the reaction efficiency.

[0023] 2. The cooling crystallization method and equipment of azelaic acid can remove the crystals hanging on the wall in the reactor through the crystal removal component to avoid crystal waste. In combination with the impurity removal component, the n-octane layer and the azelaic acid crystal layer can be sent out from two outlets respectively to avoid impurities in the n-octane layer on the interface from contacting with the azelaic acid aqueous solution, thereby improving the purity of the azelaic acid crystals. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The structure of the present invention is shown in FIG. Figure 1 ;

[0025] Figure 2 The structure of the present invention is shown in FIG. Figure 2 ;

[0026] Figure 3 The structure of the present invention is shown in FIG. Figure 3 ;

[0027] Figure 4 It is a schematic diagram of the structure of a part of the stirring assembly of the present invention;

[0028] Figure 5 It is a schematic diagram of the structure inside the reactor of the present invention;

[0029] Figure 6This is a schematic diagram of the positional relationship between the stirring assembly and the decrystallization assembly of the present invention;

[0030] Figure 7 It is a schematic diagram of the structure of a stirring assembly and a decrystallization assembly of the present invention from a partial top view;

[0031] Figure 8 For the present invention Figure 6 A schematic diagram of the structure with a partial enlargement at the center;

[0032] Fig. 9 For the present invention Figure 6 Schematic diagram of the structure with a partial enlargement at point B in the middle.

[0033] In the figure: 1, carrier platform; 11, mounting frame; 12, servo motor; 13, fixing frame; 14, reactor; 15, feed port; 16, discharge port; 2, first bevel gear; 21, second bevel gear; 22, first rotating wheel; 23, first transmission belt; 24, second rotating wheel; 25, first rotating rod; 26, third rotating wheel; 27, second transmission belt; 28, fourth rotating wheel; 29, driving groove; 210, first connecting member; 211, gear ring; 21 2. First gear; 213. Second gear; 214. Second rotating rod; 215. Agitator; 3. Return spring; 31. Extension; 32. First slider; 33. First slide groove; 34. Scraper; 35. Slip ring; 36. Second connecting member; 37. Scraper strip; 38. Second slider; 39. Second slide groove; 310. Elastic rope; 311. Vibrating ball; 4. Filter plate; 41. Limit block; 42. Collection bin; 43. Vacuum pump; 44. Conduit. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] Example 1: Please refer to Figures 1 to 5The present invention provides a technical solution: a nonanedioic acid cooling crystallization device, comprising a bearing platform 1, a mounting frame 11, a servo motor 12, a fixing frame 13, a reactor 14, a feed port 15 and a discharge port 16, the mounting frame 11 is fixedly mounted on the upper surface of the bearing platform 1, the servo motor 12 is fixedly mounted on one side of the mounting frame 11, the fixing frame 13 is fixedly mounted on the output shaft of the servo motor 12, the reactor 14 is fixedly mounted on the inner side of the fixing frame 13, the feed port 15 is opened on the upper side of the reactor 14, the discharge port 16 is opened on the lower side of the reactor 14, and the feed port 15 and the discharge port 16 are both provided with seals, a stirring assembly is provided on the mounting frame 11, and the stirring assembly includes a first bevel gear 2, the first bevel gear 2 is fixedly mounted on one side of the mounting frame 11, and is in active contact with the output shaft of the servo motor 12, the upper side of the first bevel gear 2 is meshed with a second bevel gear 21, and the second bevel gear 21 is movably mounted on the inner side of the fixing frame 13;

[0036] A first rotating wheel 22 is fixedly installed in the middle part above the second bevel gear 21, a first transmission belt 23 is transmission-connected to the outer surface of the first rotating wheel 22, a side of the first transmission belt 23 away from the first rotating wheel 22 is transmission-connected to the second rotating wheel 24, a first rotating rod 25 is fixedly installed in the middle part of the lower surface of the second rotating wheel 24, a third rotating wheel 26 is fixedly sleeved on the outer surface of the first rotating rod 25, a second transmission belt 27 is transmission-connected to the outer surface of the third rotating wheel 26, and a side of the second transmission belt 27 away from the second transmission belt 27 is transmission-connected to the fourth rotating wheel 28;

[0037] A driving groove 29 is provided on the upper side of the inner cavity of the fixed frame 13, and a first connecting member 210 is movably installed in the driving groove 29. A gear ring 211 is fixedly installed at the bottom of the first connecting member 210. A first gear 212 is meshed on the inner side of the gear ring 211. There are three first gears 212, which are evenly and equidistantly distributed on the inner side of the gear ring 211. A second gear 213 is meshed on one side of the gear ring 211. One second gear 213 is fixedly connected to the fourth rotating wheel 28. A second rotating rod 214 is fixedly installed in the middle of the second gear 213. A stirring member 215 is fixedly sleeved on the outer surface of the second rotating rod 214, and the stirring member 215 is in the inner cavity of the reactor 14.

[0038] The radius of the second bevel gear 21 is twice that of the first bevel gear 2 , and the radius of the second gear 213 is four times that of the first gear 212 .

[0039] Specifically, when in use, the user first needs to place the crude azelaic acid and the reaction medium into the inner cavity of the reactor 14 through the feed port 15, and then seal the feed port 15, and then heat the reactor 14 to 80 to 90 degrees, and then start the servo motor 12 so that the fixed frame 13 drives the reactor 14 to flip, so that the substances in the inner cavity of the reactor 14 are quickly mixed to improve the reaction efficiency;

[0040] Furthermore, when the fixed frame 13 is flipped, the second bevel gear 21 will rotate on the surface of the first bevel gear 2, thereby rotating, and then the first rotating wheel 22 can be rotated. The first rotating wheel 22 can be used to drive the first transmission belt 23, so that the second rotating wheel 24 can be rotated. The second rotating wheel 24 can drive the first rotating rod 25 to rotate, so that the first rotating rod 25 drives the third rotating wheel 26 to rotate. The third rotating wheel 26 can drive the second transmission belt 27, so that the second transmission belt 27 drives the fourth rotating wheel 28 to rotate. The fourth rotating wheel 28 can drive the second gear 213 to rotate, so that the second gear 213 drives the first gear 212 to rotate, and the first gear 212 can drive the gear ring 211 to rotate, so that the three first gears 212 rotate, and then the second rotating rod 214 drives the stirring member 215 to rotate, so as to achieve stirring, which can accelerate the rapid fusion of the reaction substances and further improve the reaction efficiency.

[0041] Example 2: Please refer to Figure 1 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 The stirring member 215 is provided with a decrystalline assembly, which includes a reset spring 3. The interior of the stirring member 215 is hollow, and the reset spring 3 is fixedly connected to the inner cavity wall of the stirring member 215. The other end of the reset spring 3 is fixedly connected to an extension member 31, which is movably installed between the extension member 31 and the stirring member 215. A scraper 34 is fixedly installed at one end of the extension member 31 away from the reset spring 3.

[0042] A slip ring 35 is movably mounted on the outer surface of the second rotating rod 214. Second connecting members 36 are fixedly connected to both sides of the outer surface of the slip ring 35. A scraper 37 is fixedly connected to the bottom of the second connecting member 36. The scraper 37 is located on both sides of the stirring member 215 and is in movably contact with the stirring member 215.

[0043] An elastic rope 310 is fixedly connected to the outer surface of the first rotating rod 25, and a vibration ball 311 is fixedly connected to one end of the elastic rope 310 away from the first rotating rod 25;

[0044] The first sliders 32 are fixedly mounted on both the upper and lower sides of the extension member 31, and the first slide grooves 33 adapted to the first sliders 32 are provided on both the upper and lower sides of the inner cavity of the stirring member 215;

[0045] Second sliders 38 are fixedly mounted on both sides of the upper surface of the slip ring 35, and a second slide groove 39 adapted to the second slider 38 is formed on the surface of the second rotating rod 214;

[0046] The first rotating rod 25 is provided with a debris removal component, which includes a filter plate 4, which is movably mounted on the outer surface of the first rotating rod 25 and movably mounted between the second rotating rod 214, and a limit block 41 is fixedly mounted on the outer surface of the first rotating rod 25;

[0047] A collecting bin 42 is fixedly mounted on the top of the fixing frame 13, an air pump 43 is fixedly mounted on the collecting bin 42, and a conduit 44 is fixedly connected to one side of the collecting bin 42;

[0048] The diameter above the reactor 14 matches the diameter below it, and the inner diameter above the reactor 14 matches the diameter of the filter plate 4 .

[0049] On the basis of Example 1, during the stirring process, as the fixing frame 13 turns over, the filter plate 4 will also reciprocate up and down in the upper half of the inner cavity of the reactor 14, and the reaction substances can be pushed during the reciprocating motion, further improving the reaction efficiency of the reaction substances;

[0050] When the stirring operation is completed, the reactor 14 needs to be in a vertical state, and the part with a smaller diameter of the reactor 14 is at the top. At this time, it is maintained at 80 to 90 degrees, and the liquid is allowed to stand. During the process of the reactor 14 being kept vertical, the filter plate 4 will move downward to the limit block 41. It should be noted that during the manufacturing process of the reactor 14, the phase interface position during liquid separation needs to be determined according to the volume of the reactor 14, and the filter plate 4 is placed below the phase interface after falling. In this way, impurities precipitated during the liquid separation process will be filtered by the filter plate 4 to prevent impurities from entering the azelaic acid aqueous solution.

[0051] After the liquid separation is completed, the conduit 44 needs to be placed into the inner cavity of the reactor 14 through the feed port 15 so that the conduit 44 is in the upper n-octane layer, and the vacuum pump 43 is started to suck the n-octane layer so that the n-octane layer enters the collection bin 42 for collection;

[0052] After the n-octane layer is collected, the remaining azelaic acid aqueous solution in the inner cavity of the reactor 14 needs to be cooled and crystallized. The temperature needs to be reduced to 15 degrees Celsius. At this time, the crystallization operation is completed, and the discharge port 16 needs to be opened to collect the crystals.

[0053] After the crystals are collected, the discharge port 16 needs to be closed again, and then the servo motor 12 is started to drive the stirring member 215 to rotate. During the rotation of the stirring member 215, the scraper 34 will contact the inner cavity wall of the reactor 14, and the crystals hanging on the inner cavity wall of the reactor 14 can be scraped off. In addition, when the scraper 34 contacts the inner cavity wall of the reactor 14, the extension member 31 will squeeze the reset spring 3, causing the reset spring 3 to be compressed and deformed, so that the extension member 31 can enter the inner cavity of the stirring member 215. When the extension member 31 enters the inner cavity of the stirring member 215, the crystals on the surface of the extension member 31 will be scraped off by the stirring member 215.

[0054] During the overturning process of the reactor 14, the slip ring 35 will slide on the surface of the second rotating rod 214, and the slip ring 35 will drive the scraper 37 to move up and down, so that the scraper 37 reciprocates to scrape off the crystals on the surface of the stirring member 215. In addition, during the rotation process of the first rotating rod 25, the vibration ball 311 will be driven to touch the scraper 34, so that the scraper 34 will vibrate, which can further remove the crystals on the surfaces of the stirring member 215, the extension member 31 and the scraper 34.

[0055] It should be noted that during the manufacturing process, a transparent observation window can be provided on the surface of the reactor 14 to facilitate the user to observe the reaction conditions. When the crystallization operation is completed, the discharge port 16 needs to be opened to collect the crystals, so as to avoid the waste of crystals.

[0056] In the above operation, the n-octane layer and the azelaic acid crystal layer are respectively sent out from two outlets, so that impurities in the n-octane layer on the phase interface can be prevented from contacting with the azelaic acid aqueous solution, which can effectively improve the purity of the azelaic acid crystals.

[0057] A method for crystallizing azelaic acid by cooling, using the azelaic acid crystallization device as described above, comprises the following steps:

[0058] S1: First, the user puts the crude azelaic acid and the reaction medium into the inner cavity of the reaction kettle 14, and starts the servo motor 12 to drive the stirring element 215 and the reaction kettle 14 to rotate, so as to stir the crude azelaic acid and the reaction medium;

[0059] S2: After the stirring is completed, the reactor 14 needs to be in a vertical state to perform liquid separation. After the liquid separation is completed, the upper layer of liquid in the reactor 14 can be extracted by starting the vacuum pump 43, so that the remaining liquid in the reactor 14 can be cooled and crystallized;

[0060] S3: After cooling and crystallization, the crystals are collected through the discharge port 16, and then the servo motor 12 is started again to drive the stirring member 215 to rotate, so that the scraper 34 scrapes the crystals on the surface of the inner cavity wall of the reactor 14, completing the comprehensive collection of the crystals.

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A nonanedioic acid cooling crystallization device, comprising a bearing platform (1), a mounting frame (11), a servo motor (12), a fixing frame (13), a reactor (14), a feed port (15) and a discharge port (16), wherein the mounting frame (11) is fixedly mounted on the upper surface of the bearing platform (1), the servo motor (12) is fixedly mounted on one side of the mounting frame (11), the fixing frame (13) is fixedly mounted on the output shaft of the servo motor (12), the reactor (14) is fixedly mounted on the inner side of the fixing frame (13), the feed port (15) is opened on the upper side of the reactor (14), the discharge port (16) is opened on the lower side of the reactor (14), and the feed port (15) and the discharge port (16) are both provided with seals, characterized in that: The mounting frame (11) is provided with a stirring assembly, the stirring assembly comprising a first bevel gear (2), the first bevel gear (2) is fixedly mounted on one side of the mounting frame (11) and is in movably contact with an output shaft of a servo motor (12), a second bevel gear (21) is meshed on the upper side of the first bevel gear (2), and the second bevel gear (21) is movably mounted on the inner side of a fixed frame (13); A first rotating wheel (22) is fixedly mounted in the middle of the upper part of the second bevel gear (21); a first transmission belt (23) is transmission-connected to the outer surface of the first rotating wheel (22); a side of the first transmission belt (23) away from the first rotating wheel (22) is transmission-connected to the second rotating wheel (24); a first rotating rod (25) is fixedly mounted in the middle of the lower surface of the second rotating wheel (24); a third rotating wheel (26) is fixedly sleeved on the outer surface of the first rotating rod (25); a second transmission belt (27) is transmission-connected to the outer surface of the third rotating wheel (26); a fourth rotating wheel (28) is transmission-connected to the side of the second transmission belt (27) away from the second transmission belt (27); A driving groove (29) is provided on the upper side of the inner cavity of the fixed frame (13), and a first connecting member (210) is movably installed in the driving groove (29). A gear ring (211) is fixedly installed at the bottom of the first connecting member (210), and a first gear (212) is meshed on the inner side of the gear ring (211). The number of the first gears (212) is three and they are evenly and equidistantly distributed on the inner side of the gear ring (211). A second gear (213) is meshed on one side of the gear ring (211), and one of the second gears (213) is fixedly connected to the fourth rotating wheel (28). A second rotating rod (214) is fixedly installed in the middle of the second gear (213), and a stirring member (215) is fixedly sleeved on the outer surface of the second rotating rod (214), and the stirring member (215) is located in the inner cavity of the reaction kettle (14).

2. The azelaic acid cooling crystallization equipment according to claim 1, characterized in that: The stirring member (215) is provided with a decrystalline assembly, the decrystalline assembly comprising a reset spring (3), the interior of the stirring member (215) is hollow, and the reset spring (3) is fixedly connected to the inner cavity wall of the stirring member (215), the other end of the reset spring (3) is fixedly connected to an extension member (31), the extension member (31) is movably installed between the stirring member (215), and a scraper (34) is fixedly installed at one end of the extension member (31) away from the reset spring (3); A slip ring (35) is movably mounted on the outer surface of the second rotating rod (214); second connecting members (36) are fixedly connected to both sides of the outer surface of the slip ring (35); a scraper (37) is fixedly connected to the bottom of the second connecting member (36); the scraper (37) is located on both sides of the stirring member (215) and is in movably contact with the stirring member (215); An elastic rope (310) is fixedly connected to the outer surface of the first rotating rod (25), and an end of the elastic rope (310) away from the first rotating rod (25) is fixedly connected to a vibrating ball (311).

3. The azelaic acid cooling crystallization device according to claim 2, characterized in that: The first rotating rod (25) is provided with a debris removal component, the debris removal component comprises a filter plate (4), the filter plate (4) is movably mounted on the outer surface of the first rotating rod (25), and is movably mounted between the second rotating rod (214), and a limit block (41) is fixedly mounted on the outer surface of the first rotating rod (25); A collecting bin (42) is fixedly mounted on the top of the fixing frame (13), an air extraction pump (43) is fixedly mounted on the collecting bin (42), and a conduit (44) is fixedly connected to one side of the collecting bin (42).

4. The azelaic acid cooling crystallization device according to claim 3, characterized in that: The upper and lower sides of the extension member (31) are both fixedly mounted with first sliding blocks (32), and the upper and lower sides of the inner cavity of the stirring member (215) are both provided with first sliding grooves (33) adapted to the first sliding blocks (32).

5. The azelaic acid cooling crystallization equipment according to claim 4, characterized in that: Second sliding blocks (38) are fixedly mounted on both sides of the upper surface of the slip ring (35), and a second sliding groove (39) adapted to the second sliding block (38) is provided on the surface of the second rotating rod (214).

6. The azelaic acid cooling crystallization equipment according to claim 5, characterized in that: The radius of the second bevel gear (21) is twice the radius of the first bevel gear (2), and the radius of the second gear (213) is four times the radius of the first gear (212).

7. The azelaic acid cooling crystallization device according to claim 6, characterized in that: The diameter above the reaction kettle (14) is smaller than the diameter below the reaction kettle (14), and the inner diameter above the reaction kettle (14) is matched with the diameter of the filter plate (4).

8. A method for crystallizing azelaic acid by cooling, using the azelaic acid crystallization device as described above, characterized in that: The following steps are involved: S1: First, the user puts the crude azelaic acid and the reaction medium into the inner cavity of the reaction kettle (14), and starts the servo motor (12) to drive the stirring element (215) and the reaction kettle (14) to rotate, so as to stir the crude azelaic acid and the reaction medium; S2: After the stirring is completed, the reaction kettle (14) needs to be in a vertical state to perform liquid separation. After the liquid separation is completed, the upper layer of liquid in the reaction kettle (14) can be extracted by starting the vacuum pump (43), so that the remaining liquid in the reaction kettle (14) can be cooled and crystallized; S3: After the crystallization is completed by cooling, the crystals are collected through the discharge port (16), and then the servo motor (12) is started again to drive the stirring element (215) to rotate, so that the scraper (34) scrapes the crystals on the surface of the inner cavity wall of the reactor (14), thereby completing the comprehensive collection of the crystals.

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