Improved methyl propyl acid methyl acetate distillation kettle condensing device

Abstract

The utility model relates to chemical distillation equipment technical field, concretely discloses an improved methyl propyl acid methyl acetate distillation kettle condensing device, including distillation kettle, condensing box, the condensing tube that is located in the condensing box and the cooling medium circulation system that communicates with the condensing tube, the condensing tube is spiral coil pipe structure, and along the steam flow direction, the pitch and diameter of spiral coil pipe gradually increase, the condensing tube is connected with steam inlet and condensate outlet respectively through flange, the cooling medium circulation system includes first circulation loop, second circulation loop and plate heat exchanger, the first circulation loop fills gas-liquid two-phase cooling medium, the second circulation loop fills refrigerant, and both heat exchange through plate heat exchanger, through the pitch change spiral coil pipe adaptation steam condensing volume change, combine double loop cooling system high -efficient heat exchange, significantly improve condensing efficiency and reduce energy consumption, enhance equipment stability and maintainability simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of chemical distillation equipment technology, and specifically discloses an improved condensation device for a methyl methyl propionate distillation kettle. Background Technology

[0002] In chemical production processes, methyl methyl propyl acrylate (MPMA) is an important organic intermediate widely used in coatings, adhesives, solvents, and other fields. Distillation purification is a crucial step in its production, and the performance of the condensation unit directly affects the purity, yield, and energy efficiency of the product.

[0003] Currently, traditional distillation kettle condensation devices mostly use fixed-structure spiral coil or straight-tube condensers, which have the following technical drawbacks:

[0004] Low condensation efficiency means that the volume of steam gradually decreases during the condensation process. However, the traditional equal pitch and equal diameter design of condenser tubes cannot adapt to this change, resulting in uneven steam flow resistance. Some steam fails to condense fully, affecting product yield.

[0005] It has high energy consumption, limited heat exchange efficiency of a single cooling loop, low utilization rate of cold energy, and requires additional recovery and treatment of uncondensed steam, which increases energy consumption.

[0006] While some improvements exist in the prior art (such as the distillation column for rapid condensation of methyl methacrylate (MMA) disclosed in CN214436579U), these are primarily designed for MMA and rely on the recovery of uncondensed vapor through an exhaust stack, failing to fundamentally address the compatibility issue between the condenser structure and the cooling system. Furthermore, these solutions do not consider the specific condensation requirements of MMA, making them difficult to directly apply to the MMA production process.

[0007] Therefore, there is an urgent need for a distillation kettle condenser optimized for the properties of methyl methylpropionate, which can achieve efficient, low-consumption, and stable condensation by improving the condenser tube structure, increasing the efficiency of the cooling system, and enhancing maintainability. Utility Model Content

[0008] This invention proposes an improved condensation device for a methyl methacrylate distillation kettle. By optimizing the condenser tube structure, designing an efficient cooling medium circulation system, using corrosion-resistant materials, and employing a reasonable component design, it achieves a comprehensive effect of improved condensation efficiency, efficient system operation, enhanced corrosion resistance and maintainability of the device, and improved energy utilization.

[0009] This invention is implemented as follows: an improved methyl methacrylate distillation kettle condenser includes a distillation kettle, a condenser box, a condenser tube disposed in the condenser box, and a cooling medium circulation system connected to the condenser tube. The condenser box has a steam inlet at the top, which is connected to the steam output pipe of the distillation kettle via a flange, and a condensate outlet at the bottom of the condenser box. The condenser tube has a spiral coil structure, and the pitch and diameter of the spiral coil gradually increase along the steam flow direction. The condenser tube is connected to the steam inlet and the condensate outlet via flanges respectively. The cooling medium circulation system includes a first circulation loop, a second circulation loop, and a plate heat exchanger. The first circulation loop is filled with a gas-liquid two-phase refrigerant, and the second circulation loop is filled with refrigerant, and the two exchange heat through the plate heat exchanger.

[0010] As a preferred embodiment of the improved methyl methacrylate distillation kettle condensation device of this utility model, the spiral coil has a spiral helix angle of 15°-30°, a starting pitch of 20-30mm, an ending pitch of 40-60mm, a starting diameter of 15-20mm, and an ending diameter of 25-30mm.

[0011] As a preferred embodiment of the improved methyl methacrylate distillation kettle condensation device of this utility model, the first circulation loop includes a storage tank, a fluorine pump, and a load cooling pipe network; the storage tank is a cylindrical sealed container, and an outlet pipe is provided at the bottom of the storage tank, which is connected to the inlet of the fluorine pump through a flange; the fluorine pump is a centrifugal fluorine pump, which is installed on the pipe between the storage tank and the load cooling pipe network to drive the circulation of the gas-liquid two-phase refrigerant; the load cooling pipe network surrounds the outside of the condenser tube, and the load cooling pipe network is composed of multiple copper pipes; the two ends of the load cooling pipe network are respectively connected to the outlet of the fluorine pump and one side interface of the plate heat exchanger.

[0012] In a preferred embodiment of the improved methyl methacrylate distillation kettle condensing device of this utility model, the second circulation loop includes a compressor, a condenser, and a thermostatic expansion valve; the compressor is a screw compressor, and the outlet of the compressor is connected to the inlet of the condenser through a pipe; the condenser is an air-cooled condenser, and the outlet of the condenser is connected to the thermostatic expansion valve through a pipe; the outlet of the thermostatic expansion valve is connected to the other side interface of the plate heat exchanger, and the remaining interface of the plate heat exchanger is then connected to the inlet of the compressor, forming a refrigerant circulation loop.

[0013] As a preferred embodiment of the improved methyl methacrylate distillation kettle condensation device of this utility model, the plate heat exchanger is a brazed plate heat exchanger, and the plate heat exchanger is provided with multiple layers of corrugated plates. The refrigerant in the first circulation loop and the gas-liquid two-phase refrigerant in the second circulation loop flow on both sides of the plates, and efficient heat exchange is carried out through the plates.

[0014] As a preferred embodiment of the improved methyl methacrylate distillation kettle condensation device of this utility model, a shut-off valve is installed on the liquid outlet pipe, and a liquid level gauge, a safety valve and a liquid replenishment port are provided on the liquid storage tank.

[0015] As a preferred embodiment of the improved methyl methacrylate distillation kettle condensation device of this utility model, the condensation box is made of stainless steel, the inner wall of the condensation box is coated with a corrosion-resistant coating, and an inspection door is provided on the side of the condensation box.

[0016] The beneficial effects of this utility model are:

[0017] 1. The condenser tube adopts a spiral coil structure, and the pitch and diameter gradually increase along the direction of steam flow. With the specific spiral angle, starting and ending pitch and tube diameter design, the residence time of steam in the condenser tube is effectively increased, so that the steam and the refrigerant can fully exchange heat, which significantly improves the condensation efficiency.

[0018] 2. The first and second circulation loops exchange heat through plate heat exchangers, ensuring the efficient operation of the cooling medium circulation system and continuously providing good cooling conditions for steam condensation, thereby further improving the overall performance of the device. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure 2 This is a cross-sectional structural diagram of the liquid storage tank of this utility model.

[0022] Figure 3 This is a schematic diagram of the structure of the condenser box and the access door of this utility model.

[0023] The markings in the diagram are: 1. Distillation vessel; 2. Condenser; 3. Condenser tube; 4. Steam inlet; 5. Condensate outlet; 6. First circulation loop; 7. Second circulation loop; 8. Plate heat exchanger; 9. Storage tank; 10. Fluorine pump; 11. Load cooling piping network; 12. Liquid outlet pipe; 13. Compressor; 14. Condenser; 15. Thermal expansion valve; 16. Shut-off valve; 17. Level gauge; 18. Safety valve; 19. Liquid replenishment port; 20. Corrosion-resistant coating; 21. Inspection door. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0025] Please see Figure 1-3 An improved methyl methacrylate distillation kettle condenser includes a distillation kettle 1, a condenser box 2, a condenser tube 3 disposed in the condenser box 2, and a cooling medium circulation system connected to the condenser tube 3. The top of the condenser box 2 is provided with a steam inlet 4, which is connected to the steam output pipe of the distillation kettle 1 through a flange. The bottom of the condenser box 2 is provided with a condensate outlet 5. The condenser tube 3 is a spiral coil structure, and the pitch and diameter of the spiral coil gradually increase along the steam flow direction. The condenser tube 3 is connected to the steam inlet 4 and the condensate outlet 5 through flanges respectively. The cooling medium circulation system includes a first circulation loop 6, a second circulation loop 7, and a plate heat exchanger 8. The first circulation loop 6 is filled with a gas-liquid two-phase refrigerant, and the second circulation loop 7 is filled with refrigerant. The two exchange heat through the plate heat exchanger 8.

[0026] In this embodiment: after the methyl methacrylate mixture in the distillation vessel 1 is heated and vaporized, the steam enters the condenser 2 through the steam output pipe. In the condenser 2, the steam flows along the condenser tube 3 with a spiral coil structure. At the same time, the cooling medium circulation system starts to work. The cooling medium circulation system is divided into a first circulation loop 6 and a second circulation loop 7. The gas-liquid two-phase refrigerant in the first circulation loop 6 circulates in the load cooling pipe network 11, absorbing the heat of the steam in the condenser tube 3 to achieve preliminary cooling. The gas-liquid two-phase refrigerant in the first circulation loop 6 and the refrigerant in the second circulation loop 7 exchange heat through the plate heat exchanger 8. The refrigerant carries away the heat absorbed by the refrigerant, thereby ensuring that the refrigerant has a continuous cooling capacity. Finally, the steam is gradually cooled and condensed into liquid in the condenser tube 3. The condensed liquid finally flows out from the condensate outlet 5 to the collection device (the collection device is connected to the bottom of the condensate outlet 5).

[0027] As a technical optimization of this utility model, the spiral coil has a spiral helix angle of 15°-30°, a starting pitch of 20-30mm, an ending pitch of 40-60mm, a starting diameter of 15-20mm, and an ending diameter of 25-30mm.

[0028] In this embodiment, the specific parameters have been optimized to make the flow state of steam in the condenser tube 3 more reasonable and the residence time more appropriate, thereby improving the condensation efficiency and ensuring that the device can operate stably and efficiently.

[0029] As a technical optimization of this utility model, the first circulation loop 6 includes a liquid storage tank 9, a fluorine pump 10, and a load cooling pipe network 11; the liquid storage tank 9 is a cylindrical sealed container, and the bottom of the liquid storage tank 9 is provided with a liquid outlet pipe 12, which is connected to the inlet of the fluorine pump 10 through a flange; the fluorine pump 10 is a centrifugal fluorine pump, which is installed on the pipe between the liquid storage tank 9 and the load cooling pipe network 11 to drive the circulation of the gas-liquid two-phase refrigerant; the load cooling pipe network 11 surrounds the outside of the condenser tube 3, and the load cooling pipe network 11 is composed of multiple copper tubes; the two ends of the load cooling pipe network 11 are respectively connected to the outlet of the fluorine pump 10 and one side interface of the plate heat exchanger 8.

[0030] In this embodiment: the storage tank 9 stores the gas-liquid two-phase refrigerant and provides refrigerant reserves for the circulation system; its cylindrical sealing design can ensure that the refrigerant is not contaminated by the outside world; the level gauge 17 is used to monitor the refrigerant level in the storage tank 9 in real time; the safety valve 18 ensures the system pressure safety; and the replenishment port 19 can replenish the refrigerant when needed.

[0031] The fluorine pump 10 drives the gas-liquid two-phase refrigerant to circulate in the first circulation loop 6, so that the refrigerant can continuously circulate between the load cooling pipe network 11 and the plate heat exchanger 8 to achieve heat transfer.

[0032] The load cooling pipe network 11 surrounds the outside of the condenser tube 3. The gas-liquid two-phase refrigerant flowing in it absorbs the heat of the steam in the condenser tube 3 and cools the steam. It is composed of multiple copper tubes, and the good thermal conductivity of copper tubes improves the heat exchange efficiency.

[0033] The components of the first circulation loop 6 work together to ensure that the gas-liquid two-phase refrigerant can circulate stably in the system, efficiently absorb the heat of the steam in the condenser tube 3, and provide good cooling conditions for steam condensation.

[0034] As a technical optimization of this utility model, the second circulation loop 7 includes a compressor 13, a condenser 14, and a thermostatic expansion valve 15; the compressor 13 is a screw compressor, and the outlet of the compressor 13 is connected to the inlet of the condenser 14 through a pipe. The condenser 14 is an air-cooled condenser, and the outlet of the condenser 14 is connected to the thermostatic expansion valve 15 through a pipe; the outlet of the thermostatic expansion valve 15 is connected to the other side interface of the plate heat exchanger 8, and the remaining interface of the plate heat exchanger 8 is then connected to the inlet of the compressor 13 to form a refrigerant circulation loop.

[0035] In this embodiment: the compressor 13 compresses the low-temperature, low-pressure refrigerant into a high-temperature, high-pressure gas, increasing the temperature and pressure of the refrigerant and creating conditions for subsequent heat dissipation in the condenser 14 and heat absorption in the plate heat exchanger 8; a screw compressor is used, which is stable in operation and has high compression efficiency;

[0036] The condenser 14 cools the high-temperature and high-pressure refrigerant, turning it into a high-pressure liquid; the air-cooled condenser 14 does not require an additional cooling water source, is easy to use, and can effectively dissipate the heat of the refrigerant to the surrounding environment.

[0037] The thermal expansion valve 15 throttles and reduces the pressure of the high-pressure refrigerant, turning it into a low-temperature, low-pressure gas-liquid mixture, which facilitates the absorption of heat from the refrigerant in the first circulation loop 6 in the plate heat exchanger 8.

[0038] The second circulation loop 7 ensures that the refrigerant can complete the cycle of compression, condensation, throttling and evaporation in the system, and achieves efficient heat exchange with the refrigerant in the first circulation loop 6, thereby maintaining the stable operation of the entire cooling medium circulation system and ensuring the condensation effect of the device.

[0039] As a technical optimization of this utility model, the plate heat exchanger 8 adopts a brazed plate heat exchanger 8. The plate heat exchanger 8 is provided with multiple layers of corrugated plates. The first circulation loop 6 and the gas-liquid two-phase refrigerant and the refrigerant of the second circulation loop 7 flow on both sides of the plates respectively, and perform efficient heat exchange through the plates.

[0040] In this embodiment, the plate heat exchanger 8 of this type and structure can greatly increase the heat exchange area and improve the heat exchange efficiency, making the heat transfer between the first circulation loop 6 and the second circulation loop 7 more efficient, which helps to improve the energy utilization and condensation effect of the entire device.

[0041] As a technical optimization of this utility model, a shut-off valve 16 is installed on the liquid outlet pipe 12, and a liquid level gauge 17, a safety valve 18 and a liquid replenishment port 19 are provided on the liquid storage tank 9.

[0042] In this embodiment: the shut-off valve 16 can control the flow of the refrigerant, which facilitates system maintenance and repair; the level gauge 17 facilitates real-time monitoring of the refrigerant level in the storage tank 9 to ensure normal system operation; the safety valve 18 ensures system pressure safety and prevents safety accidents caused by excessive pressure; the replenishment port 19 can replenish the refrigerant when it is insufficient, ensuring the continuous and stable operation of the system.

[0043] As a technical optimization of this utility model, the condenser box 2 is made of stainless steel, the inner wall of the condenser box 2 is coated with a corrosion-resistant coating 20, and an inspection door 21 is opened on the side of the condenser box 2.

[0044] In this embodiment: the stainless steel material and corrosion-resistant coating 20 enhance the corrosion resistance of the condenser box 2 and extend its service life; the inspection door 21 on the side facilitates the inspection, maintenance and replacement of the internal components of the condenser box 2, improving the maintainability of the device.

[0045] Working principle and usage process of this utility model:

[0046] The methyl methacrylate mixture is heated in distillation vessel 1, reaching its boiling point and vaporizing into steam. The steam flows through the steam outlet pipe of distillation vessel 1 to condenser 2. The steam enters condenser 2 through steam inlet 4 at the top of condenser 2 and connects to condenser tube 3. The steam flows inside condenser tube 3, which has a spiral coil structure, and the pitch and diameter of the spiral coil gradually increase along the steam flow direction. During this process, the gas-liquid two-phase refrigerant in the load cooling pipe network 11 surrounding the condenser tube 3 continuously absorbs the heat of the steam, causing the steam temperature to decrease and gradually condense into liquid. The gas-liquid two-phase refrigerant in the first circulation loop 6 flows out from the liquid outlet pipe 12 at the bottom of the storage tank 9 and is driven into the load cooling pipe network by the fluorine pump 10. 11. After absorbing heat, it flows back to the plate heat exchanger 8, exchanges heat with the refrigerant in the second circulation loop 7, releases heat, and returns to the liquid storage tank 9 to complete one cycle. The compressor 13 in the second circulation loop 7 compresses the low-temperature, low-pressure refrigerant into a high-temperature, high-pressure gas, which then enters the condenser 14. In the condenser 14, the refrigerant is cooled into a high-pressure liquid, and then its pressure is reduced by the thermostatic expansion valve 15, becoming a low-temperature, low-pressure gas-liquid mixture before entering the plate heat exchanger 8. It absorbs heat from the refrigerant in the first circulation loop 6, becomes a gaseous refrigerant, and returns to the compressor 13 to complete the refrigerant cycle. The condensed methyl methacrylate liquid flows out from the condensate outlet 5 at the bottom of the condenser 2 and enters the collection device for collection.

[0047] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0048] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. An improved methyl methacrylate distillation kettle condenser, comprising a distillation kettle (1), a condenser box (2), a condenser tube (3) disposed in the condenser box (2), and a cooling medium circulation system connected to the condenser tube (3), characterized in that: The condenser (2) is provided with a steam inlet (4) at the top, which is connected to the steam output pipe of the distillation vessel (1) through a flange. The condenser (2) is provided with a condensate outlet (5) at the bottom. The condenser tube (3) is a spiral coil structure, and the pitch and diameter of the spiral coil gradually increase along the steam flow direction. The condenser tube (3) is connected to the steam inlet (4) and the condensate outlet (5) through flanges respectively. The cooling medium circulation system includes a first circulation loop (6), a second circulation loop (7) and a plate heat exchanger (8). The first circulation loop (6) is filled with a gas-liquid two-phase refrigerant, and the second circulation loop (7) is filled with refrigerant. The two exchange heat through the plate heat exchanger (8).

2. The improved methyl methacrylate distillation kettle condenser according to claim 1, characterized in that: The spiral coil has a helix angle of 15°-30°, a starting pitch of 20-30mm, an ending pitch of 40-60mm, a starting diameter of 15-20mm, and an ending diameter of 25-30mm.

3. The improved methyl methacrylate distillation kettle condenser according to claim 1, characterized in that: The first circulation loop (6) includes a storage tank (9), a fluorine pump (10), and a load cooling pipe network (11); the storage tank (9) is a cylindrical sealed container, and the bottom of the storage tank (9) is provided with a liquid outlet pipe (12), which is connected to the inlet of the fluorine pump (10) through a flange; the fluorine pump (10) is a centrifugal fluorine pump, which is installed on the pipe between the storage tank (9) and the load cooling pipe network (11) to drive the circulation of the gas-liquid two-phase refrigerant; the load cooling pipe network (11) surrounds the outside of the condenser (3), and the load cooling pipe network (11) is composed of multiple copper pipes; the two ends of the load cooling pipe network (11) are respectively connected to the outlet of the fluorine pump (10) and one side interface of the plate heat exchanger (8).

4. The improved methyl methacrylate distillation kettle condenser according to claim 1, characterized in that: The second circulation loop (7) includes a compressor (13), a condenser (14), and a thermostatic expansion valve (15). The compressor (13) is a screw compressor. The outlet of the compressor (13) is connected to the inlet of the condenser (14) through a pipe. The condenser (14) is an air-cooled condenser. The outlet of the condenser (14) is connected to the thermostatic expansion valve (15) through a pipe. The outlet of the thermostatic expansion valve (15) is connected to the other side interface of the plate heat exchanger (8). The remaining interface of the plate heat exchanger (8) is then connected to the inlet of the compressor (13) to form a refrigerant circulation loop.

5. The improved methyl methacrylate distillation kettle condenser according to claim 1, characterized in that: The plate heat exchanger (8) is a brazed plate heat exchanger (8). The plate heat exchanger (8) is provided with multiple corrugated plates inside. The first circulation loop (6) and the gas-liquid two-phase refrigerant and the refrigerant of the second circulation loop (7) flow on both sides of the plates respectively, and perform efficient heat exchange through the plates.

6. The improved methyl methacrylate distillation kettle condenser according to claim 3, characterized in that: The liquid outlet pipe (12) is equipped with a shut-off valve (16), and the liquid storage tank (9) is equipped with a level gauge (17), a safety valve (18) and a liquid replenishment port (19).

7. The improved methyl methacrylate distillation kettle condenser according to claim 1, characterized in that: The condenser box (2) is made of stainless steel. The inner wall of the condenser box (2) is coated with a corrosion-resistant coating (20). An inspection door (21) is provided on the side of the condenser box (2).

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