Connecting structure between esterification kettle and deacidification tower
The connection structure with an ascending gas pipe, descending liquid pipe, and nitrogen purge in the esterification reactor and acid removal tower addresses the issue of agglomeration and blockage, ensuring operational stability and efficiency by recirculating liquid during abnormal conditions.
Patent Information
- Application Number
- CN202422312856.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-23
AI Technical Summary
The uplift pipe between the esterification kettle and the deacidification tower is prone to polymerization blockage, resulting in abnormal gas resistance and affecting the normal operation of the device.
The matching structure of the uplift pipe, downlift pipe, overflow weir and nitrogen purge pipe is adopted. The valve of the lowering pipe is closed in normal working conditions, and the gas phase is contacted and elution is carried out. When abnormal, the valve is opened to return part of the liquid phase to the esterification kettle to avoid polymerization and blockage.
It improves the load elasticity of the device, reduces the risk of blockage of the uplift pipe and deacid tower, enhances the gas phase elution efficiency, and ensures the stable operation of the device.
Smart Images
Figure CN223096766U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of esterification production equipment, in particular to a connection structure between an esterification kettle and a deacidification tower. Background Art
[0002] With the continuous development of the global economy and the acceleration of the industrialization process, the demand for methyl methacrylate in the coatings, dyes, plastics, and adhesives industries continues to grow. As the second largest economy in the world, China's industrialization level is constantly improving, and the high efficiency of methyl methacrylate production equipment is particularly important.
[0003] In the esterification reaction for producing methyl methacrylate, not only methyl methacrylate is produced, but also by-product methylacrylic acid is produced. The function of the deacidification tower connected to the esterification kettle is to separate the product methyl methacrylate and unreacted methanol, and at the same time remove methylacrylic acid.
[0004] Although the deacidification tower uses the method of ammonia injection and neutralization to remove methylacrylic acid, polymerization reaction blockage still occurs at the riser pipe connected between the esterification kettle and the deacidification tower. After the polymerization blockage, abnormal gas resistance is caused, resulting in a reduction in the device load and inability to operate normally. Therefore, in order to avoid polymerization reaction blockage of the gas phase in the riser pipe, a connection structure between the esterification kettle and the deacidification tower is needed to solve the problems of abnormal polymerization blockage of the riser pipe and gas resistance of the deacidification tower. Summary of the Utility Model
[0005] In order to solve the above technical problems, the utility model proposes a connection structure between an esterification kettle and a deacidification tower. Through the cooperation of a riser pipe, a downcomer, an overflow weir, and a nitrogen purge pipe, under normal operating conditions, the cut-off valve on the downcomer is in the closed state. The gas phase in the esterification kettle body rises through the riser pipe and enters the deacidification tower body. In the riser pipe, the gas phase contacts the downward flowing liquid phase in the deacidification tower body in a countercurrent manner, and methylacrylic acid in the gas phase is eluted and returned to the esterification kettle body, reducing the polymerization risk of the deacidification tower. When abnormal operating conditions or overload operation occur in the esterification reaction, the cut-off valve at the upper part of the downcomer is opened, and part of the liquid phase returns to the esterification kettle body through the downcomer, which can effectively avoid polymerization blockage in the riser pipe.
[0006] The technical solution for achieving the purpose of the utility model is: a connection structure between an esterification kettle and a deacidification tower, including an esterification kettle body, a deacidification tower body is arranged above the esterification kettle body, and further includes: an overflow weir, the overflow weir is symmetrically arranged inside the deacidification tower body; a riser pipe is connected between the esterification kettle body and the deacidification tower body, and a plurality of downcomers are arranged at the top of the esterification kettle body. The upper ends of the plurality of downcomers are connected to the outer area of the overflow weir, and cut-off valves are arranged at the upper parts of the plurality of downcomers, and nitrogen purge pipes are arranged below the cut-off valves.
[0007] In some embodiments, the length of the riser pipe is 500 mm - 1000 mm, and the diameter of the riser pipe satisfies that the upward gas flow velocity is 5 m / s - 8 m / s.
[0008] In some embodiments, a plurality of the downcomers are specifically arranged in a U shape, and the middle U-shaped bend is 250 mm - 350 mm.
[0009] In some embodiments, the diameters of a plurality of the downcomers satisfy that the liquid phase flow velocity in the plurality of downcomers is 0.2 m / s - 0.6 m / s.
[0010] In some embodiments, the height of the overflow weir is 20 mm - 50 mm.
[0011] In some embodiments, the riser pipe and the overflow weir share a central axis, and the diameter of the overflow weir is 1.3 - 2 times that of the riser pipe.
[0012] Compared with the prior art, the remarkable advantages of the present utility model are as follows:
[0013] It has a large load elasticity and can allow the operation load of the esterification unit to fluctuate between 50% and 150%.
[0014] In the present utility model, through the cooperation of the riser pipe, the downcomer, the overflow weir and the nitrogen purge pipe, under normal operating conditions, the cut-off valve on the downcomer is in a closed state. When an abnormal condition or overload operation occurs in the esterification reaction, the cut-off valve at the upper part of the downcomer is opened, and part of the liquid phase returns to the main body of the esterification kettle through the downcomer, which can effectively increase the processing load of the device;
[0015] It can not only avoid polymerization blockage in the riser pipe, but also reduce the probability of blockage of the deacidification tower.
[0016] In the riser pipe, the gas-liquid two-phase flows in high speed in a countercurrent mass transfer manner, which improves the elution efficiency of methacrylic acid in the upward gas phase. It not only solves the problem that polymerization reaction blockage occurs at the riser pipe connecting the esterification kettle and the deacidification tower in the prior art, resulting in abnormal gas resistance, reduction of the device load and inability to operate normally. It also reduces the risk of methacrylic acid blockage in the deacidification tower. Description of the Drawings
[0017] The following further explains the present utility model in conjunction with the drawings and embodiments:
[0018] Figure 1 It is a schematic diagram of the overall structure provided by the present utility model in an embodiment.
[0019] Description of the reference numerals:
[0020] 1. Main body of the esterification kettle; 2. Main body of the deacidification tower; 3. Riser pipe; 4. Downcomer; 5. Overflow weir; 6. Nitrogen purge pipe. Detailed implementation mode
[0021] The present utility model will be described in detail below. The technical solutions in the embodiments of the present utility model are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present utility model.
[0022] The present utility model provides an improved connection structure between an esterification kettle and a deacidification tower. The technical solution of the present utility model is as follows:
[0023] As Figure 1 shown, a connection structure between an esterification kettle and a deacidification tower includes an esterification kettle main body 1. A deacidification tower main body 2 is arranged above the esterification kettle main body 1. It further includes: an overflow weir 5, which is symmetrically arranged inside the deacidification tower main body 2; a riser pipe 3 is connected between the esterification kettle main body 1 and the deacidification tower main body 2, and a plurality of downcomer pipes 4 are arranged at the top of the esterification kettle main body 1. The upper ends of the plurality of downcomer pipes 4 are all connected to the outer area of the overflow weir 5, and a cut-off valve is arranged on the upper part of the plurality of downcomer pipes 4, and a nitrogen purging pipe 6 is arranged below the cut-off valve;
[0024] During operation, under normal conditions, the cut-off valve on the downcomer pipe 4 is in the closed state. The gas phase in the esterification kettle main body 1 rises through the riser pipe 3 and enters the inside of the deacidification tower main body 2. In the esterification kettle main body 1, the gas phase contacts the downward flowing liquid phase in the deacidification tower main body 2 in a countercurrent manner. Methacrylic acid and the like in the gas phase are eluted and returned to the esterification kettle main body 1, reducing the polymerization risk of the deacidification tower main body 2. When the esterification reaction is abnormal or overloaded, the cut-off valve on the upper part of the downcomer pipe 4 is opened, and part of the liquid phase returns to the inside of the esterification kettle main body 1 through the downcomer pipe 4, effectively avoiding polymerization blockage in the riser pipe 3 and reducing the blockage probability of the deacidification tower main body 2.
[0025] As Figure 1 shown, in one embodiment, the length of the riser pipe 3 is 500 mm - 1000 mm, and the diameter of the riser pipe 3 satisfies that the rising gas flow rate is 5 m / s - 8 m / s. If the flow rate is too low or the diameter of the riser pipe 3 is large, not only the investment is high, but also polymerization reaction is likely to occur on the wall surface of the riser pipe 3, resulting in wall hanging and even blockage. If the flow rate is too high, gas resistance is likely to be formed.
[0026] As Figure 1 shown, in one embodiment, the plurality of downcomer pipes 4 are specifically arranged in a U shape, and the middle U-shaped bend is 250 mm - 350 mm. Below this height, liquid seal cannot be achieved. If the height exceeds this range, it will not help the liquid seal effect and will increase the liquid flow resistance.
[0027] As Figure 1 As shown, in one embodiment, the diameters of the plurality of downcomers 4 are such that the liquid phase flow rate in the plurality of downcomers 4 is 0.2 m / s - 0.6 m / s.
[0028] As Figure 1 shown, in one embodiment, the height of the overflow weir 5 is 20 mm - 50 mm. If it is too high, the gas resistance of the riser pipe 3 is large; if it is too low, the downcomer 4 will not function.
[0029] As Figure 1 shown, in one embodiment, the riser pipe 3 and the overflow weir 5 share a central axis, and the diameter of the overflow weir 5 is 1.3 - 2 times that of the riser pipe 3.
[0030] The specific working method is as follows: Under normal operating conditions, the cut-off valve on the downcomer 4 is in the closed state. The gas phase in the esterification kettle body 1 rises through the riser pipe 3 and enters the inside of the deacidification tower body 2. In the esterification kettle body 1, the gas phase contacts the downward flowing liquid phase in the deacidification tower body 2 in countercurrent. Methacrylic acid and the like in the gas phase are eluted and returned to the esterification kettle body 1, reducing the polymerization risk of the deacidification tower body 2. When the esterification reaction is abnormal or overloaded, the cut-off valve at the upper part of the downcomer 4 is opened, and part of the liquid phase returns to the inside of the esterification kettle body 1 through the downcomer 4.
[0031] The technical means disclosed in the solution of the present utility model are not limited to the technical means disclosed in the above technical means, but also include technical solutions composed of equivalent replacements of the above technical features. Matters not covered by the present utility model belong to the common general knowledge of those skilled in the art.
Claims
1. A connection structure between an esterification kettle and a deacidification tower, comprising an esterification kettle main body (1), wherein a deacidification tower main body (2) is arranged above the esterification kettle main body (1), and is characterized in that: It further includes: An overflow weir (5), which is symmetrically arranged inside the deacidification tower main body (2); A riser pipe (3) is connected between the esterification kettle main body (1) and the deacidification tower main body (2), and a plurality of downcomer pipes (4) are arranged at the top of the esterification kettle main body (1). The upper ends of the plurality of downcomer pipes (4) are all connected to the outer area of the overflow weir (5), and a cut-off valve is arranged at the upper part of the plurality of downcomer pipes (4), and a nitrogen purge pipe (6) is arranged at the lower part of the cut-off valve.
2. The connection structure between an esterification kettle and a deacidification tower according to claim 1, wherein: The length of the riser pipe (3) is 500 mm - 1000 mm, and the diameter of the riser pipe (3) satisfies that the upward gas flow velocity is 5 m / s - 8 m / s.
3. The connection structure between an esterification kettle and a deacidification tower according to claim 1, characterized in that: The plurality of downcomer pipes (4) are specifically arranged in a U shape, and the middle U-shaped bend is 250 mm - 350 mm.
4. The connection structure between an esterification kettle and a deacidification tower according to claim 1, characterized in that: The diameters of the plurality of downcomer pipes (4) satisfy that the liquid phase flow velocity in the plurality of downcomer pipes (4) is 0.2 m / s - 0.6 m / s.
5. The connection structure between an esterification kettle and a deacidification tower according to claim 1, characterized in that: The height of the overflow weir (5) is 20 mm - 50 mm.
6. The connection structure between an esterification kettle and a deacidification tower according to claim 1, characterized in that: The riser pipe (3) and the overflow weir (5) share a central axis, and the diameter of the overflow weir (5) is 1.3 - 2 times that of the riser pipe (3).