Hot melting and cold crystallization separation equipment

Abstract

The utility model belongs to the technical field of crystallization equipment, and particularly relates to hot melting and cold crystallization separation equipment which comprises a hot dissolving kettle, a first filtering device, a cold crystallization kettle and a second filtering device, a first sampling port and a first liquid inlet are formed in the upper part of the hot dissolving kettle, a first discharging port is formed in the bottom of the hot dissolving kettle, and a first emptying valve is arranged on the first discharging port; a second sampling opening and a second liquid inlet are formed in the top of the cold crystallization kettle, a second discharging opening is formed in the bottom of the cold crystallization kettle, and a second discharging valve is arranged on the second discharging opening; the height position of the second liquid inlet is lower than that of the first discharge hole; the first discharge port is communicated with the second liquid inlet through a first filtering device, and the second discharge port is communicated with the first liquid inlet through a second filtering device. The operations of heating, cooling, mother liquor transfer, filtering, stirring and the like in the hot melting and cold crystallization experiment are completed by controlling the device, so that the experiment process is simplified, the experiment efficiency is improved, the recycling of the cold crystallization mother liquor can be realized, and the device is green and environment-friendly.

Description

Technical Field

[0001] The utility model belongs to the technical field of crystallization equipment, and particularly relates to a hot dissolution and cold crystallization separation device. Background Technique

[0002] The hot dissolution and cold crystallization separation experiment is a common inorganic salt separation experiment, which mainly utilizes the property that the solubility of substances varies greatly at different temperatures to achieve the separation and purification of substances. In the conventional experimental process, instruments such as beakers, suction flasks, and Buchner funnels need to be prepared before the experiment. During the experiment, the solute and solvent need to be put into the beaker and mixed and heated. During the heating process, the solution needs to be continuously stirred to increase the solubility of the solute. When the solution reaches the saturated state, the solution is filtered and transferred to a cooling container for cooling crystallization treatment. The solid-liquid mixture in the cooling container is filtered and separated to obtain the purified crystal, and the mother liquor after filtration is poured into the chemical waste liquid recovery bucket. In the above experiment, experimental steps such as heating, cooling, stirring, transferring, and filtering of the solution all need to be directly operated manually, which is inconvenient to operate, the steps are cumbersome, time-consuming, and the experimental efficiency is low. In addition, the mother liquor obtained from the crystallization separation experiment still contains the components of the target purified substance. Directly treating it as waste liquid will affect the recovery rate of the target purified product and waste experimental materials. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a hot dissolution and cold crystallization separation device, which can improve the experimental efficiency, save experimental materials, and is green and environmentally friendly.

[0004] The technical solution adopted by the utility model to solve the technical problem is: a hot dissolution and cold crystallization separation device, which includes a hot dissolution kettle, a first filtering device, a cold crystallization kettle, and a second filtering device; a heating device, a first automatic stirring device, and a first temperature sensor are arranged on the hot dissolution kettle. A first sampling port and a first liquid inlet are arranged on the upper part of the hot dissolution kettle, and a first discharge port is arranged at the bottom of the hot dissolution kettle. A first discharge valve is arranged on the first discharge port; a cooling device, a second automatic stirring device, and a second temperature sensor are arranged on the cold crystallization kettle. A second sampling port and a second liquid inlet are arranged at the top of the cold crystallization kettle, and a second discharge port is arranged at the bottom of the cold crystallization kettle. A second discharge valve is arranged on the second discharge port; the height position of the second liquid inlet is lower than the height position of the first discharge port.

[0005] The first discharge port is communicated with the second liquid inlet through the first filtering device, the second discharge port is communicated with the first liquid inlet through the second filtering device, and a reflux transfer pump is communicated on the conveying pipe between the second filtering device and the first liquid inlet.

[0006] Further, a clear liquid outlet is provided at the lower part of the thermal dissolution kettle. The height position of the clear liquid outlet is higher than that of the first discharge port, and a first opening and closing valve is provided on the clear liquid outlet. A clear liquid inlet with a height position lower than that of the clear liquid outlet is provided on the cold crystallization kettle, and the clear liquid outlet is communicated with the clear liquid inlet.

[0007] Further, the first filtering device includes a first bag filter and a first liquid storage tank located below it. The feed inlet of the first bag filter is communicated with the first discharge port, the liquid outlet of the first bag filter is communicated with the first liquid storage tank, and the liquid outlet of the first liquid storage tank is communicated with the second liquid inlet.

[0008] The first filtering device includes a second bag filter and a second liquid storage tank located below it. The feed inlet of the second bag filter is communicated with the second discharge port, the liquid outlet of the second bag filter is communicated with the second liquid storage tank, and the liquid outlet of the second liquid storage tank is communicated with the first liquid inlet.

[0009] Further, a liquid suction vacuum pump communicated with the first liquid storage tank and the second liquid storage tank is also included. Opening and closing valves are provided at the liquid outlets of the first liquid storage tank and the second liquid storage tank.

[0010] Further, a frame for supporting and integrating the thermal dissolution kettle, the first filtering device, the cold crystallization kettle and the second filtering device is also included. At least three movable casters are provided at the bottom of the frame.

[0011] Further, the heating device includes a heater and a heating jacket sleeved outside the thermal dissolution kettle. The liquid inlet of the heating jacket is communicated with the liquid outlet of the heating device, and the liquid outlet of the heating jacket is communicated with the liquid inlet of the heating device.

[0012] The cooling device includes a cold trap and a cooling jacket sleeved outside the cold crystallization kettle. The liquid inlet of the cooling jacket is communicated with the liquid outlet of the cold trap, and the liquid outlet of the cooling jacket is communicated with the liquid inlet of the cold trap.

[0013] Further, a condensing pipe is provided at the top of the thermal dissolution kettle, and the condensing pipe shares the same cold trap with the cooling device.

[0014] Further, the liquid outlet of the cold trap is communicated with the liquid inlet at the upper end of the condensing pipe, the liquid outlet at the lower end of the condensing pipe is communicated with the liquid inlet of the cooling jacket, and the liquid outlet of the cooling jacket is communicated with the liquid inlet of the cold trap.

[0015] Further, it further includes a first controller and a second controller. The first controller is electrically connected to the heating device, the first automatic stirring device, and the first temperature sensor, and the second controller is electrically connected to the cooling device, the second automatic stirring device, and the second temperature sensor.

[0016] Further, on the first controller, there is a heat source switch for controlling the opening and closing of the heater, a first temperature control knob for controlling the temperature of the liquid in the hot dissolution kettle, and a first stirring knob for controlling the rotation speed of the first automatic stirring device;

[0017] On the second controller, there is a cold trap switch for controlling the opening and closing of the cold trap, a second temperature control knob for controlling the temperature of the liquid in the cold crystallization kettle, and a second stirring knob for controlling the rotation speed of the second automatic stirring device.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows: It provides a hot dissolution and cold crystallization separation device. Using the present utility model for hot dissolution and cold crystallization experiments can directly transfer the hot dissolution mother liquor in the hot dissolution kettle to the cold crystallization kettle for cold crystallization treatment after being filtered by the first filtering device. The cold crystallization mother liquor after cold crystallization treatment in the cold crystallization kettle is filtered by the second filtering device and then recycled into the hot dissolution kettle to re-perform hot dissolution, cooling, separation, and purification. The second filtering device separates the purified substance from other impurities in the liquid state. Operations such as heating, cooling, mother liquor transfer, filtration, and stirring during the experiment are all completed by controlling the present utility model, simplifying the experimental process, improving the experimental efficiency, saving manpower, and also realizing the recycling of the cold crystallization mother liquor, improving the utilization rate of experimental raw materials, saving experimental materials, and being green and environmentally friendly. Description of the Drawings

[0019] Figure 1 is the front view structural schematic diagram of the present utility model;

[0020] Figure 2 is the structural layout schematic diagram of the hot dissolution kettle, the first bag filter, and the first liquid storage tank;

[0021] Figure 3 is the structural layout schematic diagram of the cold crystallization kettle, the second bag filter, and the second liquid storage tank;

[0022] Reference numerals: 1 - hot dissolution kettle; 10 - frame; 101 - mobile caster; 12 - first automatic stirring device; 13 - first temperature sensor; 14 - first sampling port; 15 - first liquid inlet; 16 - first discharge port; 17 - first discharge valve; 18 - clear liquid outlet; 19 - first opening and closing valve; 2 - cold crystallization kettle; 21 - cooling device; 22 - second automatic stirring device; 23 - second temperature sensor; 24 - second sampling port; 25 - second liquid inlet; 26 - second discharge port; 27 - second discharge valve; 28 - clear liquid inlet; 3 - reflux transfer pump; 31 - first bag filter; 32 - first liquid storage tank; 34 - opening and closing valve; 41 - second bag filter; 42 - second liquid storage tank; 5 - liquid suction filtration vacuum pump; 6 - condenser; 61 - condensate inlet; 62 - condensate outlet; 7 - first controller; 71 - heat source switch; 72 - first temperature control knob; 73 - first stirring knob; 81 - cold trap switch; 82 - second temperature control knob; 83 - second stirring knob; 91 - heater; 92 - heating jacket; 93 - cold trap; 94 - cooling jacket. Detailed implementation manners

[0023] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] As shown in the Figures 1-3 accompanying drawings, a hot dissolution and cold crystallization separation device, characterized in that: it includes a hot dissolution kettle 1, a first filtration device, a cold crystallization kettle 2 and a second filtration device; the hot dissolution kettle 1 is provided with a heating device, a first automatic stirring device 12 and a first temperature sensor 13, the upper part of the hot dissolution kettle 1 is provided with a first sampling port 14 and a first liquid inlet 15, the bottom of the hot dissolution kettle 1 is provided with a first discharge port 16, and a first discharge valve 17 is arranged on the first discharge port 16; the cold crystallization kettle 2 is provided with a cooling device, a second automatic stirring device 22 and a second temperature sensor 23, the top of the cold crystallization kettle 2 is provided with a second sampling port 24 and a second liquid inlet 25, the bottom of the cold crystallization kettle 2 is provided with a second discharge port 26, and a second discharge valve 27 is arranged on the second discharge port 26; the height position of the second liquid inlet 25 is lower than the height position of the first discharge port 16; the first discharge port 16 is communicated with the second liquid inlet 25 through the first filtration device, the second discharge port 26 is communicated with the first liquid inlet 15 through the second filtration device, and a reflux transfer pump 3 is communicated on the pipeline between the second filtration device and the first liquid inlet 15.

[0025] In use, inject a solvent into the hot dissolution kettle 1, start the heating device, heat the solvent in the hot dissolution kettle 1 to a specified temperature, add the mixed salt to be separated and purified into the hot dissolution kettle 1, and start the first automatic stirring device 12 to stir the solid-liquid mixture in the hot dissolution kettle 1 to increase the solubility rate of the experimental raw materials. The first temperature sensor 13 is used to monitor the temperature of the liquid in the hot dissolution kettle 1. During the above hot dissolution process, samples need to be taken multiple times from the first sampling port 14 and the concentration of the target purified substance in the solution is measured until the concentration of the target purified substance in the detected sample increases to a constant value. At this time, the solution is in an equilibrium state. Open the first discharge valve 17, and the solid-liquid mixture in the hot dissolution kettle 1 is discharged from the first discharge port 16 under the action of gravity and then filtered by the first filtering device. The first filtering device separates the incompletely dissolved solid-phase experimental raw materials from the hot dissolution mother liquor, and the hot dissolution mother liquor enters the cold crystallization kettle 2 through the second liquid inlet 25 by the first filtering device. Start the cooling device, the second automatic stirring device 22 and the second temperature sensor 23. During this process, liquid samples are taken multiple times from the second sampling port 24 until the concentration of the target extract in the detected sample decreases to a constant value. Open the second discharge valve 27 and start the reflux transfer pump 3, so that the solid-liquid mixture in the cold crystallization kettle 2 is discharged from the second discharge port 26 and then filtered by the second filtering device. The second filtering device filters out the solid target purified substance, and the remaining cooling mother liquor is refluxed to the hot dissolution kettle 1 through the first liquid inlet 15 under the action of the reflux transfer pump 3 for heating again. There is a small amount of the target substance to be purified remaining in the cooling mother liquor refluxed to the hot dissolution kettle 1. If multiple hot dissolution and cold crystallization separation experiments are required, only need to add the mixed salt to be separated and purified into the hot dissolution kettle 1 multiple times, turn on the reflux transfer pump 3, open the first discharge valve 17 and the second discharge valve 27.

[0026] Using the present utility model for hot dissolution and cooling experiments, the hot dissolution mother liquor in the hot dissolution kettle 1 can be directly transferred to the cold crystallization kettle 2 for cold crystallization treatment after being filtered by the first filtering device. The cold crystallization mother liquor after cold crystallization treatment in the cold crystallization kettle 2 is filtered by the second filtering device and then recycled into the hot dissolution kettle 1 again. Operations such as heating, cooling, mother liquor transfer, filtration, and stirring in the hot dissolution and cold crystallization experiments can all be completed by the present utility model, simplifying the experimental process, improving the experimental efficiency, and saving manpower. In addition, it can also realize the recycling of the remaining mother liquor after cold crystallization treatment, without adding water into the hot dissolution kettle 1 again, simplifying the experimental steps, improving the utilization rate of experimental raw materials, saving experimental materials, and being green and environmentally friendly.

[0027] Preferably, a supernatant outlet 18 is further provided at the lower part of the hot dissolution kettle 1. The height position of the supernatant outlet 18 is higher than that of the first discharge port 16. A first opening and closing valve 19 is provided on the supernatant outlet 18. A supernatant inlet 28 with a height position lower than that of the supernatant outlet 18 is provided on the cold crystallization kettle 2. The supernatant outlet 18 is communicated with the supernatant inlet 28. After the solution in the hot dissolution kettle 1 is balanced, stirring is stopped and the solution is allowed to stand. The solid phase precipitates at the bottom of the hot dissolution kettle 1. The first opening and closing valve 19 is opened, and the supernatant above the precipitate can flow out from the supernatant outlet 18 and flow into the cold crystallization kettle 2 through the supernatant inlet 28. After the supernatant is discharged, the first discharge valve 17 is opened, and the hot dissolution mother liquor obtained by filtering the solid-liquid mixture at the bottom of the hot dissolution kettle 1 through the first filtering device enters the cold crystallization kettle 2. The above-mentioned first discharge valve 17 and the first opening and closing valve 19 can be opened simultaneously, so that the first discharge port 16 and the supernatant outlet 18 simultaneously transport the hot dissolution mother liquor to the cold crystallization kettle 2. The water filtration amount of the first filtering device is reduced, and the transfer efficiency of the hot dissolution mother liquor is further improved.

[0028] The first filtering device and the second filtering device can be a pipe structure with a filter screen inside, a kettle body with a filter screen at the liquid outlet, or a combined structure of a Buchner funnel and a pipe structure or a kettle body. These structures are not conducive to taking out the filter. Preferably, the first filtering device includes a first bag filter 31 and a first liquid storage tank 32 located below it. The feed inlet of the first bag filter 31 is communicated with the first discharge port 16. The liquid outlet of the first bag filter 31 is communicated with the first liquid storage tank 32. The liquid outlet of the first liquid storage tank 32 is communicated with the second liquid inlet 25. The second filtering device includes a second bag filter 41 and a second liquid storage tank 42 located below it. The feed inlet of the second bag filter 41 is communicated with the second discharge port 26. The liquid outlet of the second bag filter 41 is communicated with the second liquid storage tank 42. The liquid outlet of the second liquid storage tank 42 is communicated with the first liquid inlet 15. Both the first bag filter 31 and the second bag filter 32 are bag filters. Inside the bag filter, the filter bag is supported by a metal wire basket. The liquid flows in from the inlet, is filtered by the filter bag and then flows out from the outlet. The impurities are intercepted in the filter bag. After the filter bag is replaced, it can be used continuously, which is convenient for recycling the experimental raw materials and the target purified substances. The first liquid storage tank 32 is used to temporarily store the filtered hot dissolution mother liquor to prevent the small size of the second liquid inlet 25 from affecting the liquid transfer efficiency and the filtering efficiency of the first bag filter 31. The second liquid storage tank 42 is used to temporarily store the mother liquor after cold crystallization to prevent the small size of the first liquid inlet 15 from affecting the liquid transfer efficiency and the filtering efficiency of the second bag filter 41, and further improve the liquid transfer efficiency.

[0029] As a further preference, it further includes a liquid suction and filtration vacuum pump 5 connected to the first liquid storage tank 32 and the second liquid storage tank 42; opening and closing valves 34 are provided at the liquid outlets of the first liquid storage tank 32 and the second liquid storage tank 42. When the first bag filter 31 filters the hot-dissolved solid-liquid mixture, the opening and closing valve 34 at the liquid outlet of the first liquid storage tank 32 is opened, and the liquid suction and filtration vacuum pump 5 is started to filter the solid-liquid mixture in the first bag filter 31, improving the filtration efficiency of the hot-dissolved mother liquor. Similarly, when the second bag filter 41 filters the cold-crystallized solid-liquid mixture, the opening and closing valve 34 at the liquid outlet of the second liquid storage tank 42 is opened, and the liquid suction and filtration vacuum pump 5 is started to filter the solid-liquid mixture in the second bag filter 41, improving the filtration efficiency of the cold-crystallized mother liquor and further improving the experimental efficiency.

[0030] Preferably, it further includes a frame 10 for supporting and integrating the hot-dissolving kettle 1, the first filtration device, the cold-crystallizing kettle 2, and the second filtration device. At least 3 moving casters 101 are provided at the bottom of the frame 10. The utility model is integrally assembled into an integrally transportable unit, facilitating the overall handling and transfer of the equipment.

[0031] The heating device can be a resistance wire mechanism directly heating the hot-dissolving kettle 1 provided therein, or a water circulation heating structure or an oil circulation heating structure. The cooling device can be a water cooling device or an oil cooling device. Specifically, the heating device includes a heater 91 and a heating jacket 92 sleeved outside the hot-dissolving kettle 1. The liquid inlet of the heating jacket 92 is communicated with the liquid outlet of the heating device, and the liquid outlet of the heating jacket 92 is communicated with the liquid inlet of the heating device; the cooling device includes a cold trap 93 and a cooling jacket 94 sleeved outside the cold-crystallizing kettle 2. The liquid inlet of the cooling jacket 94 is communicated with the liquid outlet of the cold trap 93, and the liquid outlet of the cooling jacket 94 is communicated with the liquid inlet of the cold trap 93. Heating liquids are added to both the heater 91 and the heating jacket 92 and the liquids circulate in their cavities. The heating jacket 92 directly heats the hot-dissolving kettle 1 under the action of the internal liquid, and the heater 91 is used to heat the circulating liquid. Similarly, cooling liquids are added to both the cold trap 93 and the cooling jacket 94 and the cooling liquids circulate between them. The cooling jacket 94 directly cools the cold-crystallizing kettle 2 under the action of the internal cooling liquid, and the cold trap 93 is used to cool the circulating cooling liquid.

[0032] Preferably, a condensing pipe 6 communicating with the cold trap 93 is provided at the top of the thermal dissolution kettle 1. Substances in the solvent volatilized by heat in the thermal dissolution kettle 1 are condensed and refluxed through the condensing pipe 6, reducing solvent loss. As a further preference, the condensing pipe 6 shares the same cold trap 93 with the cooling device. Specifically, the liquid outlet of the cold trap 93 is communicated with the liquid inlet at the upper end of the condensing pipe 6, the liquid outlet at the lower end of the condensing pipe 6 is communicated with the liquid inlet of the cooling jacket 94, and the liquid outlet of the cooling jacket 94 is communicated with the liquid inlet of the cold trap 93. That is, the coolant cooled by the cold trap 93 first enters the interlayer of the condensing pipe 6, then flows out of the interlayer of the condensing pipe 6 into the cooling jacket 94, and finally flows out of the cooling jacket 94 into the cold trap 93 to form a cycle.

[0033] The first automatic stirring device 13 and the second automatic stirring device 14 can be magnetic stirring devices or water circulation stirring devices, or can be stirring paddles driven by a motor or a rotary cylinder. Specifically, both the first automatic stirring device 13 and the second automatic stirring device 14 include a driving motor and a stirring paddle driven by the motor to rotate. This structure belongs to an existing structure and is often used in supporting the kettle body.

[0034] Preferably, a first controller 7 and a second controller 8 are further included. The first controller 7 is electrically connected to the heating device, the first automatic stirring device 12, and the first temperature sensor 13. The second controller 8 is electrically connected to the cooling device, the second automatic stirring device 22, and the second temperature sensor 23. Through the first controller 7, experimental parameters such as the opening state, heating temperature, heating duration, and stirring speed of the first automatic stirring device 12 of the heating device can be controlled; through the second controller 8, experimental parameters such as the opening state, heating temperature, heating duration, and stirring speed of the second automatic stirring device 22 of the cooling device can be controlled, which is stable, reliable, convenient, fast, and saves manpower.

[0035] Specifically, the first controller 7 is provided with a heat source switch 71 for controlling the opening and closing of the heater 91, a first temperature control knob 72 for controlling the liquid temperature in the thermal dissolution kettle 1, and a first stirring knob 73 for controlling the rotation speed of the first automatic stirring device 12; the second controller 8 is provided with a cold trap switch 81 for controlling the opening and closing of the cold trap 93, a second temperature control knob 82 for controlling the liquid temperature in the cold crystallization kettle 2, and a second stirring knob 83 for controlling the rotation speed of the second automatic stirring device 22. Different buttons on the controller can be used to control the heater 91, the liquid temperature in the thermal dissolution kettle 1, the first automatic stirring device 12, the cold trap 93, the liquid temperature in the cold crystallization kettle 2, and the second automatic stirring device 22 respectively, so as to set different experimental conditions and increase the application range of this device.

Claims

1. A hot melt cold crystallization separation device, characterized in that: The invention comprises a hot dissolving kettle (1), a first filtering device, a cold crystallization kettle (2) and a second filtering device; the hot dissolving kettle (1) is provided with a heating device, a first automatic stirring device (12) and a first temperature sensor (13); the upper part of the hot dissolving kettle (1) is provided with a first sampling port (14) and a first liquid inlet (15); the bottom of the hot dissolving kettle (1) is provided with a first discharge port (16); the first discharge port (16) is provided with a first discharge valve (17); the cold crystallization kettle (2) is provided with a cooling device, a second automatic stirring device (22) and a second temperature sensor (23); the top of the cold crystallization kettle (2) is provided with a second sampling port (24) and a second liquid inlet (25); the bottom of the cold crystallization kettle (2) is provided with a second discharge port (26); the second discharge port (26) is provided with a second discharge valve (27); the height position of the second liquid inlet (25) is lower than the height position of the first discharge port (16); The first material outlet (16) is connected to the second liquid inlet (25) via the first filtering device, the second material outlet (26) is connected to the first liquid inlet (15) via the second filtering device, and a reflux delivery pump (3) is connected to the pipeline between the second filtering device and the first liquid inlet (15).

2. The hot melt cold crystallization separation equipment according to claim 1 is characterized in that: The hot dissolution kettle (1) is also provided with a clear liquid outlet (18) at a lower portion, the clear liquid outlet (18) being located at a higher height than the first discharge port (16), and a first opening and closing valve (19) being provided on the clear liquid outlet (18); the cold crystallization kettle (2) is provided with a clear liquid inlet (28) at a lower height than the clear liquid outlet (18), and the clear liquid outlet (18) is communicated with the clear liquid inlet (28).

3. The hot melt cold crystallization separation equipment according to claim 1 is characterized in that: The first filtering device comprises a first bag filter (31) and a first liquid storage tank (32) located below the first bag filter, the feed inlet of the first bag filter (31) is connected to the first feed outlet (16), the liquid outlet of the first bag filter (31) is connected to the first liquid storage tank (32), and the liquid outlet of the first liquid storage tank (32) is connected to the second liquid inlet (25); The first filtering device comprises a second bag filter (41) and a second liquid storage tank (42) located below the second bag filter, the feed inlet of the second bag filter (41) is connected to the second feed outlet (26), the liquid outlet of the second bag filter (41) is connected to the second liquid storage tank (42), and the liquid outlet of the second liquid storage tank (42) is connected to the first liquid inlet (15).

4. The hot melt cold crystallization separation equipment according to claim 3 is characterized in that: It also includes a liquid filtration vacuum pump (5) connected to the first liquid storage tank (32) and the second liquid storage tank (42); and opening and closing valves (34) are provided at the liquid outlets of the first liquid storage tank (32) and the second liquid storage tank (42).

5. The hot melt cold crystallization separation equipment according to claim 4 is characterized in that: It also includes a frame (10) for supporting and integrating the hot dissolution kettle (1), the first filtering device, the cold crystallization kettle (2) and the second filtering device, and the bottom of the frame (10) is provided with at least three movable casters (101).

6. The hot melt cold crystallization separation equipment according to claim 1, characterized in that: The heating device comprises a heater (91) and a heating jacket (92) sleeved outside the thermal dissolution kettle (1), the liquid inlet of the heating jacket (92) being connected to the liquid outlet of the heating device, and the liquid outlet of the heating jacket (92) being connected to the liquid inlet of the heating device; The cooling device comprises a cold trap (93) and a cooling jacket (94) sleeved outside the cold crystallization kettle (2), the liquid inlet of the cooling jacket (94) being connected to the liquid outlet of the cold trap (93), and the liquid outlet of the cooling jacket (94) being connected to the liquid inlet of the cold trap (93).

7. The hot melt cold crystallization separation equipment according to claim 6, characterized in that: A condenser (6) is provided on the top of the thermal dissolution kettle (1), and the condenser (6) and the cooling device share the same cold trap (93).

8. The hot melt cold crystallization separation equipment according to claim 7, characterized in that: The liquid outlet of the cold trap (93) is connected to the liquid inlet at the upper end of the condenser (6), the liquid outlet at the lower end of the condenser (6) is connected to the liquid inlet of the cooling jacket (94), and the liquid outlet of the cooling jacket (94) is connected to the liquid inlet of the cold trap (93).

9. The hot melt cold crystallization separation equipment according to any one of claims 1 to 8, characterized in that: It also includes a first controller (7) and a second controller (8), wherein the first controller (7) is electrically connected to the heating device, the first automatic stirring device (12) and the first temperature sensor (13), and the second controller (8) is electrically connected to the cooling device, the second automatic stirring device (22) and the second temperature sensor (23).

10. The hot melt cold crystallization separation equipment according to claim 7, characterized in that: The device further comprises a first controller (7) and a second controller (8), wherein the first controller (7) is electrically connected to the heating device, the first automatic stirring device (12) and the first temperature sensor (13), and the second controller (8) is electrically connected to the cooling device, the second automatic stirring device (22) and the second temperature sensor (23); The first controller (7) is provided with a heat source switch (71) for controlling the opening and closing of the heater (91), a first temperature control knob (72) for controlling the temperature of the liquid in the thermal dissolution kettle (1), and a first stirring knob (73) for controlling the rotation speed of the first automatic stirring device (12); The second controller (8) is provided with a cold trap switch (81) for controlling the opening and closing of the cold trap (93), a second temperature control knob (82) for controlling the temperature of the liquid in the cold crystallization kettle (2), and a second stirring knob (83) for controlling the rotation speed of the second automatic stirring device (22).

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