Energy-saving cooling crystallizer in MCPP propionic acid production
By designing an energy-saving cooling crystallizer with cooling, recovery, and heating components in the production of MCPP propionic acid, the problems of heat waste and energy consumption during the cooling crystallization process are solved, achieving energy-saving and efficient crystallization results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-28
- Publication Date
- 2026-04-03
AI Technical Summary
In the production of MCPP propionic acid, there are problems of heat waste and increased energy consumption during the cooling and crystallization process, especially the excessive energy consumption caused by the need for additional heating in the later stage of crystallization.
An energy-saving cooling crystallizer comprising a cooling component, a recovery component, and a heating component was designed. The cooling component absorbs heat from the solution, the recovery component recovers the heat and performs local heating in the later stage of crystallization, thereby reducing the energy consumption of additional heating equipment.
This method achieves energy-saving effects in the cooling and crystallization process of MCPP propionic acid solution, improves crystallization efficiency and crystal quality, and reduces the energy consumption of additional heating equipment.
Smart Images
Figure CN224071214U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of crystallization equipment for MCPP propionic acid production, specifically an energy-saving cooling crystallizer for MCPP propionic acid production. Background Technology
[0002] In the production of MCPP propionic acid, a cooling crystallizer is used to separate and purify the product, control crystal morphology and particle size, and improve production efficiency. During crystallization, the mixed solution resulting from the MCPP propionic acid reaction is first piped into the cooling crystallizer. Then, the cooling system of the crystallizer is activated, and the circulating flow of a cooling medium (such as cold water or chilled brine) absorbs the heat of the solution, causing the solution temperature to gradually decrease. As the solution temperature decreases, crystallization begins when the supersaturation point of MCPP propionic acid is reached. After crystallization, the solution containing crystals is passed through a filter screen, leaving the crystals on the screen while the mother liquor flows out through the filter screen. The separated crystals need to be washed to remove surface impurities, and then dried to obtain pure MCPP propionic acid.
[0003] In the later stages of MCPP propionic acid solution cooling and crystallization, some crystals have precipitated. At this point, the supersaturation of the solution decreases, and the crystallization rate slows down. In actual operation, heat is introduced to the bottom of the crystallizer through a heating device, causing the hot cooling medium to release heat and slightly raising the local temperature inside the crystallizer. This promotes the desorption of impurities adsorbed on the crystal surface and avoids stress caused by local overcooling, thus improving crystal quality. However, during the MCPP propionic acid solution cooling and crystallization process, the heat carried out from the MCPP propionic acid solution by the cooling tube is not fully utilized, resulting in heat waste. Furthermore, the introduction of a heating device to heat the bottom of the crystallizer in the later stages of MCPP propionic acid solution cooling and crystallization further increases energy consumption, leading to increased energy consumption during the MCPP propionic acid solution cooling and crystallization process.
[0004] Therefore, there is an urgent need for an energy-saving cooling crystallizer for MCPP propionic acid production to solve the above problems. Utility Model Content
[0005] To achieve the above objectives, this utility model provides the following technical solution: an energy-saving cooling crystallizer for MCPP propionic acid production, comprising a processing tank and a feeding channel disposed on the side wall of the processing tank, wherein the processing tank is provided with a discharge pipe near the bottom side wall, the processing tank is provided with a stirring element for stirring the MCPP propionic acid solution during the cooling crystallization process, and further comprising a cooling component disposed in the processing tank for cooling and crystallizing the MCPP propionic acid solution, a recovery component disposed in the processing tank for recovering heat during the cooling process of the MCPP propionic acid solution, and a heating component disposed in the recovery component for local heating of the MCPP propionic acid solution in the later stage of cooling and crystallization;
[0006] The cooling assembly includes a sandwich panel formed in the side wall of the processing tank. Multiple strip plates are fixedly connected between two opposing inner walls of the sandwich panel. The side wall of the processing tank is provided with an inlet pipe and an outlet pipe, which are respectively located on the side wall of the processing tank near the bottom and top.
[0007] Each of the strip plates has a one-way valve on the side wall of the end furthest from the bottom of the treatment tank.
[0008] The recycling assembly includes a recycling box located on one side of the bottom of the treatment tank. A recycling pipe is installed in the spiral disc inside the recycling box. One end of the recycling pipe is connected to the water outlet pipe through a connecting pipe. A pump is installed on the side wall of the connecting pipe. The other end of the recycling pipe passes through the recycling box and is connected to an external storage tank. The side of the recycling box closest to the treatment tank is connected to the bottom of the treatment tank through a heat insulation sleeve.
[0009] The heating assembly includes multiple sliding holes formed on the side of the recycling bin near the heat insulation sleeve. Each sliding hole is slidably connected to a heat-conducting plate. The heat insulation sleeve is provided with a driving assembly for driving each heat-conducting plate. Each heat-conducting plate is fixedly connected to two symmetrically arranged fixing plates on the inner side wall of the recycling bin. The two fixing plates are slidably connected to T-shaped rods. One end of each T-shaped rod is connected to the inner wall of the recycling bin near the processing tank. Springs are sleeved on the side walls of the two T-shaped rods. The two ends of each spring are connected to the inner wall of the recycling bin and the fixing plate, respectively.
[0010] The driving assembly includes a driving ring rotatably connected to the heat insulation sleeve. The driving ring has multiple driving holes, each of which is matched with a heat-conducting plate. Each heat-conducting plate has an inclined surface on one side.
[0011] A connecting plate is fixedly connected to the side wall of the recycling bin. A motor is provided on the side of the connecting plate away from the processing tank. A friction wheel is connected to the output end of the motor. A rotating hole is opened on the side wall of the heat insulation sleeve. The drive ring is rotatably connected to the rotating hole. An avoidance hole is opened on the inner wall of the rotating hole. The friction wheel is rotatably connected to the avoidance hole and is set against the side wall of the drive ring.
[0012] Compared with the prior art, the beneficial effects of this utility model are:
[0013] This invention utilizes a cooling component to absorb heat from the MCPP propionic acid solution, facilitating its cooling and crystallization. Furthermore, a heat recovery component enables the recycling and reuse of the heat from the MCPP propionic acid solution. Additionally, during the later stages of cooling and crystallization, a heating component allows for the localized heating of the processing tank using recovered heat. This not only enhances the cooling and crystallization effect of the MCPP propionic acid solution but also reduces the energy consumption of additional heating equipment, thus improving the energy efficiency of the MCPP propionic acid solution cooling and crystallization process. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0015] Figure 2 This is a schematic diagram of the internal structure of the cooling component and the stirring component of this utility model;
[0016] Figure 3 This is a schematic diagram of the internal structure of the recycling component of this utility model;
[0017] Figure 4 This is a schematic diagram of the internal structure of the heating component and the driving component of this utility model.
[0018] In the diagram: 101, processing tank; 102, feed channel; 103, discharge pipe; 201, jacket; 202, strip plate; 203, one-way valve; 204, water inlet pipe; 205, water outlet pipe; 301, recovery box; 302, recovery pipe; 303, connecting pipe; 304, pump; 305, heat insulation sleeve; 401, sliding hole; 402, heat conducting plate; 403, fixing plate; 404, T-shaped rod; 405, spring; 501, drive ring; 502, drive hole; 503, connecting plate; 504, motor; 505, friction wheel; 506, clearance hole; 507, inclined plane. Detailed Implementation
[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0020] Example 1
[0021] Please see Figures 1-4The figure shows an energy-saving cooling crystallizer for MCPP propionic acid production, including a processing tank 101 and a feed channel 102 disposed on the side wall of the processing tank 101. The processing tank 101 is provided with a discharge pipe 103 near the bottom side wall. The processing tank 101 is provided with a stirring element for stirring the MCPP propionic acid solution during the cooling and crystallization process. It also includes a cooling component disposed in the processing tank 101 for cooling and crystallizing the MCPP propionic acid solution, a recovery component disposed in the processing tank 101 for recovering heat during the cooling process of the MCPP propionic acid solution, and a heating component disposed in the recovery component for local heating of the MCPP propionic acid solution in the later stage of cooling and crystallization.
[0022] The cooling assembly includes a sandwich 201 formed in the side wall of the processing tank 101. Multiple strip plates 202 are fixedly connected between two opposing inner walls of the sandwich 201. The side wall of the processing tank 101 is provided with an inlet pipe 204 and an outlet pipe 205, which are respectively located on the side wall of the processing tank 101 near the bottom and top.
[0023] It should be noted that the cooling components are designed to absorb heat from the MCPP propionic acid solution, facilitating its cooling and crystallization. Furthermore, the heat recovery components enable the recovery and reuse of the heat from the MCPP propionic acid solution. Additionally, during the later stages of cooling and crystallization, the heating components allow for the localized heating of the processing tank 101 using recovered heat. This not only improves the cooling and crystallization effect of the MCPP propionic acid solution but also reduces the energy consumption of additional heating equipment, thus enhancing the energy efficiency of the MCPP propionic acid solution cooling and crystallization process.
[0024] It is worth noting that the inlet pipe 204 and the outlet pipe 205 are located on both sides of the strip plate 202.
[0025] Please see Figure 2 In the figure, each strip plate 202 is provided with a one-way valve 203 on the side wall of the end away from the bottom of the treatment tank 101;
[0026] It should be noted here that the one-way valve 203 restricts the flow of the cooling medium to circulate in one direction.
[0027] Please see Figures 1-4 The recycling assembly shown in the figure includes a recycling box 301 located on one side of the bottom of the treatment tank 101. A recycling pipe 302 is provided inside the recycling box 301 via a spiral disc. One end of the recycling pipe 302 is connected to the water outlet pipe 205 via a connecting pipe 303. A pump 304 is provided on the side wall of the connecting pipe 303. The other end of the recycling pipe 302 passes through the recycling box 301 and is connected to an external storage tank. The side of the recycling box 301 closest to the treatment tank 101 is connected to the bottom of the treatment tank 101 via a heat insulation sleeve 305.
[0028] It should be noted here that the heat of the MCPP propionic acid solution is recovered and reused through the setting of the recovery component.
[0029] It is worth noting that the side wall of recycling bin 301 is equipped with an inlet pipe and an outlet pipe, which are not shown in the diagram here.
[0030] Working principle: When cooling and crystallizing MCPP propionic acid solution, the mixed solution after the MCPP propionic acid production reaction is first transported to the processing tank 101 through the feed channel 102. Then, the cooling medium is transported from the water inlet pipe 204 to the jacket 201 through an external high-pressure pump. When the cooling medium enters the jacket 201, it will be blocked by the strip plate 202 and the flow direction will be restricted by the one-way valve 203, so that the cooling medium circulates evenly in the jacket 201, thereby improving the cooling uniformity of the MCPP propionic acid solution in the processing tank 101. During the cooling process of the MCPP propionic acid solution, the MCPP propionic acid solution can be stirred by the agitator (the agitator is existing technology and will not be described in detail here), so that the MCPP propionic acid solution forms a more uniform flow field in the tank 101, enhancing the efficiency of heat transfer and mass transfer.
[0031] As the cooling medium circulates and absorbs heat from the MCPP propionic acid solution, the solution temperature gradually decreases. As the solution temperature decreases, crystallization begins when the supersaturation point of MCPP propionic acid is reached. After crystallization, the solution containing crystals is passed through a filter screen, leaving the crystals on the screen while the mother liquor flows out through the filter screen. The separated crystals need to be washed to remove impurities attached to their surface, and then dried to obtain a pure MCPP propionic acid product.
[0032] Meanwhile, during the process of the cooling medium absorbing heat from the MCPP propionic acid solution, the circulating cold medium is pumped to the recovery tank 301 by pump 304, and the heat is transferred to the water in the recovery tank 301 through the spiral coil of the recovery pipe 302, which is then used to heat the water. This achieves the recovery and reuse of heat from the MCPP propionic acid solution. Furthermore, the recovered heat can be used to locally heat the processing tank 101 by setting up the heating components. This not only helps to improve the cooling and crystallization effect of the MCPP propionic acid solution, but also reduces the energy consumption of additional heating equipment, thereby improving the energy efficiency of the MCPP propionic acid solution cooling and crystallization process.
[0033] Example 2
[0034] Please see Figure 4This embodiment further illustrates Example 1. The heating assembly shown in the figure includes multiple sliding holes 401 opened on the side of the recycling bin 301 near the heat insulation sleeve 305. Each sliding hole 401 is slidably connected to a heat-conducting plate 402. The heat insulation sleeve 305 is provided with a driving assembly for driving each heat-conducting plate 402. Each heat-conducting plate 402 is fixedly connected to two symmetrically arranged fixing plates 403 on the inner side wall of the recycling bin 301. The two fixing plates 403 are slidably connected to T-shaped rods 404. One end of the two T-shaped rods 404 is connected to the inner wall of the recycling bin 301 near the processing tank 101. Springs 405 are sleeved on the side walls of the two T-shaped rods 404. The two ends of the two springs 405 are respectively connected to the inner wall of the recycling bin 301 and the fixing plate 403.
[0035] It should be noted that by setting up the heating component, the driving component makes one end of the heat-conducting plate 402 abut against the bottom of the processing tank 101, thereby conducting the heat in the recovery box 301 to the bottom of the processing tank 101, thus achieving local heating of the processing tank 101. Since some crystals have precipitated in the later stage of cooling and crystallization of MCPP propionic acid solution, the supersaturation of the solution decreases and the crystallization rate slows down. When local heating is performed at the bottom of the processing tank 101, the local temperature inside the processing tank 101 can be slightly increased, thereby promoting the desorption of impurities adsorbed on the crystal surface, while avoiding stress caused by local overcooling of the crystals, thus improving the crystal quality. Moreover, this heating operation can accelerate the dissolution of residual solutes in the mother liquor, which is convenient for subsequent mother liquor treatment. Therefore, by using the heat generated during the cooling process of MCPP propionic acid solution to achieve local heating of the processing tank 101, it not only helps to improve the cooling and crystallization effect of MCPP propionic acid solution, but also reduces the energy consumption of additional heating equipment, thereby improving the energy efficiency of the MCPP propionic acid solution cooling and crystallization process.
[0036] Please see Figure 3 and Figure 4 The driving assembly shown in the figure includes a driving ring 501 (also made of heat insulation material) rotatably connected to the heat insulation sleeve 305. The driving ring 501 has multiple driving holes 502, each driving hole 502 is matched with the heat conduction plate 402. Each heat conduction plate 402 has a slope 507 on one side. A connecting plate 503 is fixedly connected to the side wall of the recycling tank 301. A motor 504 is provided on the side of the connecting plate 503 away from the processing tank 101. A friction wheel 505 is connected to the output end of the motor 504. A rotating hole is provided on the side wall of the heat insulation sleeve 305. The driving ring 501 is rotatably connected to the rotating hole. An avoidance hole 506 is provided on the inner wall of the rotating hole. The friction wheel 505 is rotatably connected to the avoidance hole 506 and abuts against the side wall of the driving ring 501.
[0037] It should be noted here that: through the setting of the drive component, the motor 504 drives the friction wheel 505 to rotate, and then the friction between the friction wheel 505 and the drive ring 501 and the guiding action of the rotating hole drive the drive ring 501 to rotate. During the rotation of the drive ring 501, the drive hole 502 will be driven to rotate simultaneously, so that the drive hole 502 is aligned with the sliding hole 401. At this time, the heat conduction plate 402 will be moved out of the recycling box 301 under the elastic action of the spring 405 and abut against the bottom wall of the processing tank 101, thereby achieving the heating of the bottom of the processing tank 101 under the heat conduction action of the heat conduction plate 402.
[0038] After heating is completed, the reverse rotation of the drive ring 501, under the interaction force between the drive hole 502 and the inclined surface 507 of the side wall of the heat-conducting plate 402 and the guiding action of the T-shaped rod 404, pushes the heat-conducting plate 402 to move into the recycling box 301. When the drive hole 502 and the sliding hole 401 are misaligned, the heat-conducting plate 402 will be pushed to completely retract into the recycling box 301.
[0039] It is worth noting that the drive ring 501 fully abuts against the side wall of the recycling bin 301, thereby ensuring the sealing of the sliding hole 401;
[0040] Furthermore, the rotation of the drive ring 501 can also be driven by a gear ring, and the rotation form of the drive ring 501 is not limited to that disclosed in this application.
[0041] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. An energy-saving cooling crystallizer in MCPP propionic acid production, comprising: a treatment tank (101) and a feed channel (102) arranged on the side wall of the treatment tank (101), the treatment tank (101) is provided with a discharge pipe (103) near the bottom side wall, and the treatment tank (101) is provided with a stirring part for stirring the MCPP propionic acid solution during the cooling crystallization process; characterized in that it further comprises: a cooling assembly arranged in the treatment tank (101) for cooling crystallization of the MCPP propionic acid solution; a recovery assembly arranged in the treatment tank (101) for recovering heat during the cooling process of the MCPP propionic acid solution and a heating assembly arranged in the recovery assembly for local heating in the later stage of the cooling crystallization of the MCPP propionic acid solution; the cooling assembly comprises a sandwich (201) opened on the side wall of the treatment tank (101), a plurality of strip plates (202) are fixedly connected between the opposite inner walls of the sandwich (201), the side wall of the treatment tank (101) is respectively provided with a water inlet pipe (204) and a water outlet pipe (205), and the water inlet pipe (204) and the water outlet pipe (205) are arranged on the side wall of the treatment tank (101) near the bottom and the top, respectively.
2. The energy-saving cooling crystallizer in MCPP propionic acid production according to claim 1, characterized in that: Each of the strip plates (202) is provided with a one-way valve (203) on one end of the side wall away from the bottom of the treatment tank (101).
3. The energy-saving cooling crystallizer in MCPP propionic acid production according to claim 1, characterized in that: The recovery assembly comprises a recovery tank (301) arranged on one side of the bottom of the treatment tank (101), a recovery pipe (302) is arranged in the spiral disc of the recovery tank (301), one end of the recovery pipe (302) is connected with the water outlet pipe (205) through a connecting pipe (303), a pump (304) is arranged on the side wall of the connecting pipe (303), the other end of the recovery pipe (302) penetrates through the recovery tank (301) and is connected with an external liquid storage tank, and the side of the recovery tank (301) close to the treatment tank (101) is connected with the bottom of the treatment tank (101) through a heat insulation sleeve (305).
4. The energy-saving cooling crystallizer in MCPP propionic acid production according to claim 3, characterized in that: The heating assembly comprises a plurality of sliding holes (401) opened on one side of the recovery tank (301) close to the heat insulation sleeve (305), each of the sliding holes (401) is slidably connected with a heat conduction plate (402), the heat insulation sleeve (305) is provided with a driving assembly for driving each of the heat conduction plates (402), each of the heat conduction plates (402) is fixedly connected with two symmetrical fixed plates (403) on the inner side wall of the recovery tank (301), two T-shaped rods (404) are slidably connected with the two fixed plates (403), one end of each of the T-shaped rods (404) is connected with the inner wall of the side of the recovery tank (301) close to the treatment tank (101), springs (405) are arranged on the side walls of the two T-shaped rods (404), and the two ends of each of the springs (405) are connected with the inner wall of the recovery tank (301) and the fixed plate (403), respectively.
5. The energy-saving cooling crystallizer in MCPP propionic acid production according to claim 4, characterized in that: The drive assembly comprises a drive ring (501) rotationally connected to the heat insulation sleeve (305), the drive ring (501) is provided with a plurality of drive holes (502), each drive hole (502) is matched with a heat conduction plate (402), and each heat conduction plate (402) is provided with an inclined surface (507) on one side.
6. The energy-saving cooling crystallizer in MCPP propionic acid production according to claim 5, characterized in that: The recycling box (301) is fixedly connected with a connecting plate (503), a motor (504) is arranged on the side, away from the treatment tank (101), of the connecting plate (503), the output end of the motor (504) is connected with a friction wheel (505), the heat insulation sleeve (305) is provided with a rotating hole in the side wall, the drive ring (501) is rotationally connected to the rotating hole, the inner wall of the rotating hole is provided with an avoiding hole (506), and the friction wheel (505) is rotationally connected to the avoiding hole (506) and abuts against the side wall of the drive ring (501).