Esterification column with backflow spraying function

Abstract

The utility model discloses a kind of esterification column with reflux spraying function, it relates to a kind of esterification column.It includes head, first cylinder, flange, web, grating, second cylinder, lug seat, filler layer, spraying distributor, third cylinder, lug and pipe mouth assembly, the bottom of first cylinder is provided with head, the upper end of first cylinder is connected with second cylinder fixedly through flange, second cylinder lower portion outside is provided with lug seat, grating is provided with the support filler in second cylinder inside bottom end through web, grating upper portion is provided with filler layer, filler layer upper portion is provided with spraying distributor, spraying distributor is connected to reflux port through pipeline, second cylinder upper end is connected with third cylinder through flange, the outer wall of third cylinder is provided with lug, pipe mouth assembly is arranged in the outside of head, first cylinder, second cylinder and third cylinder.The utility model structure is compact, mass transfer efficiency is high, equipment height can be effectively reduced.

Description

Technical Field

[0001] This utility model relates to an esterification tower, specifically an esterification tower with a reflux spray function. Background Technology

[0002] Esterification is an important type of organic chemical reaction, and it is usually reversible. To increase the yield of esters, industrial production often employs methods such as continuously removing water or low-boiling-point products generated during the reaction from the reaction system, thereby shifting the chemical equilibrium towards ester formation. The esterification column (or process column) is the core equipment for achieving this separation process.

[0003] Traditional esterification towers typically employ packed or plate tower structures. To achieve ideal separation, tall packing layers or a large number of trays are often required to ensure sufficient contact time and area between the rising gas phase and the descending liquid phase. This leads to the following problems with traditional esterification towers: The equipment is large and expensive: the excessive height of the tower not only increases the material and manufacturing costs of the equipment itself, but also places higher demands on factory space, foundation bearing capacity and installation and hoisting, resulting in a huge overall investment.

[0004] Mass transfer efficiency needs to be improved: In large packed towers, uneven liquid distribution can easily lead to "wall flow" or "channel flow" phenomena, which prevents some packing material from being effectively utilized, reduces the overall mass transfer efficiency, and limits the production capacity of the equipment.

[0005] Poor reflux effect: The reflux liquid in some esterification columns enters the column only through a simple distributor, failing to achieve efficient heat and mass exchange with the rising steam, resulting in a limited reflux ratio, which affects the separation efficiency and the driving force of reaction equilibrium.

[0006] Therefore, how to effectively reduce the height of the esterification tower by optimizing the internal structure of the tower without reducing the separation efficiency has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0007] To address the shortcomings of existing technologies, the purpose of this invention is to provide an esterification tower with a reflux spray function, which has a compact structure, high mass transfer efficiency, and can effectively reduce the height of the equipment.

[0008] To achieve the above objectives, this utility model is implemented through the following technical solution: an esterification tower with reflux spray function, comprising a head, a first cylinder, a flange, stiffening plates, a grid, a second cylinder, lugs, a packing layer, a spray distributor, a third cylinder, lifting lugs, and a pipe assembly. The bottom of the first cylinder is provided with a head, and the upper end of the first cylinder is fixedly connected to the second cylinder through a flange. The lower part of the outer side of the second cylinder is provided with a lug. The bottom of the inner side of the second cylinder is provided with a grid that supports the packing through stiffening plates. A packing layer is provided above the grid, and a spray distributor is provided above the packing layer. The spray distributor is connected to the reflux port through a pipe. The upper end of the second cylinder is connected to the third cylinder through a flange. The outer wall of the third cylinder is provided with lifting lugs. The pipe assembly is located on the outside of the head, the first cylinder, the second cylinder, and the third cylinder.

[0009] Preferably, the nozzle assembly includes a reflux port, a bottom outlet, a gas phase inlet, a first thermometer port, a manhole, a gas phase outlet, a second thermometer port, and a polymerization inhibitor inlet. The bottom outlet is located at the bottom of the end cap. The first thermometer port and the gas phase inlet are respectively located on the upper and lower parts of the outer wall of the first cylinder. There are two manholes, respectively located on the upper and lower parts of the outer wall of the second cylinder. The reflux port, the gas phase outlet, and the second thermometer port are all located on the outer wall of the third cylinder. The polymerization inhibitor inlet is located at the top of the third cylinder.

[0010] Preferably, the packing layer is a Pall ring packing layer.

[0011] Preferably, the grille is fixed to the inner wall of the second cylinder by stiffening plates.

[0012] Preferably, the spray distributor is configured to atomize the return liquid into a uniform cluster of droplets, the size of which matches the specific surface area of ​​the packing material in the packing layer.

[0013] Preferably, the vertical distance H between the lowest point of the spray distributor and the highest point of the packing layer satisfies: 50mm ≤ H ≤ 300mm.

[0014] This utility model has the following beneficial effects: 1. By optimizing the internal structure, the tower height was reduced by 2 meters while ensuring separation efficiency, which significantly reduced equipment material costs, manufacturing costs, transportation and installation costs, as well as plant infrastructure costs.

[0015] 2. By combining a spray-type distributor with a grid-supported packing layer, uniform gas-liquid distribution is achieved, effectively avoiding wall flow and channeling phenomena, significantly improving mass transfer efficiency, and enhancing separation effect.

[0016] 3. The optimized internal structure makes the hydrodynamic state inside the tower more stable and provides greater operational flexibility. The added polymerization inhibitor inlet effectively prevents product polymerization and ensures long-term stable operation of the unit.

[0017] 4. The efficient reflux mechanism can more effectively return the product ester and unreacted alcohol to the reaction system, which strongly promotes the esterification reaction equilibrium to the positive direction and helps to improve the final yield. Attached Figure Description

[0018] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments; Figure 1 This is the front view of the present invention; Figure 2 This is a top view of the present invention. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0020] Reference Figure 1-2 The specific embodiment adopts the following technical solution: an esterification tower with reflux spray function, including a head 1, a first cylinder 2, a flange 3, a stiffener 4, a grid 5, a second cylinder 6, a lug 7, a packing layer 8, a spray distributor 9, a third cylinder 10, a lifting lug 11, and a pipe assembly 12. The bottom of the first cylinder 2 is provided with a head 1. The upper end of the first cylinder 2 is fixedly connected to the second cylinder 6 through the flange 3. The lower part of the exterior of the second cylinder 6 is provided with a lug 7. The bottom of the interior of the second cylinder 6 is provided with a grid 5 that supports the packing through the stiffener 4. A packing layer 8 is provided above the grid 5. A spray distributor 9 is provided above the packing layer 8. The spray distributor 9 is connected to the reflux port 13 through a pipe. The upper end of the second cylinder 6 is connected to the third cylinder 10 through a flange. The outer wall of the third cylinder 10 is provided with a lifting lug 11. The pipe assembly 12 is provided on the exterior of the head 1, the first cylinder 2, the second cylinder 6, and the third cylinder 10.

[0021] It is worth noting that the pipe assembly 12 includes a reflux port 13, a bottom outlet 14, a gas inlet 15, a first thermometer port 16, a manhole 17, a gas outlet 18, a second thermometer port 19, and a polymerization inhibitor inlet 20. The bottom outlet 14 is located at the bottom of the end cap 1. The first thermometer port 16 and the gas inlet 15 are respectively located on the upper and lower parts of the outer wall of the first cylinder 2. There are two manholes 17, which are respectively located on the upper and lower parts of the outer wall of the second cylinder 6. The reflux port 13, the gas outlet 18, and the second thermometer port 19 are all located on the outer wall of the third cylinder 10. The polymerization inhibitor inlet 20 is located at the top of the third cylinder 10.

[0022] It is worth noting that the packing layer 8 is a Pall ring packing layer.

[0023] It is worth noting that the grille 5 is fixed to the inner wall of the second cylinder 6 by the stiffening plate 4.

[0024] It is worth noting that the spray distributor 9 is configured to atomize the return liquid into a uniform droplet cluster, and the size of the droplet cluster matches the specific surface area of ​​the packing layer 8 to maximize the gas-liquid contact area and reduce the wall flow effect.

[0025] Furthermore, the vertical distance H between the lowest point of the spray distributor 9 and the highest point of the packing layer satisfies: 50mm ≤ H ≤ 300mm. This distance is configured to ensure that the droplets have sufficient travel space before contacting the packing to form a uniform distribution, and to prevent the droplets from re-aggregating and becoming larger due to excessive travel, thereby ensuring that the liquid enters the packing layer in the best condition.

[0026] The working principle of this specific implementation method is as follows: During operation, the gaseous mixture from the esterification reactor (mainly containing product esters, unreacted alcohols, and generated water) enters the bottom of the esterification tower through the gas inlet and flows upward through the packing layer. At the same time, the liquid phase (mainly containing product esters and alcohols) flowing back from the top condenser enters through the reflux port and is evenly sprayed onto the packing layer below by a spray distributor.

[0027] The rising steam and the falling liquid phase undergo thorough heat and mass exchange on the surface of the packing layer. During this process: High-efficiency mass transfer: The spray distributor ensures that the return liquid can uniformly wet the entire packing cross section. Combined with the grid's uniform support for the packing layer, an ideal gas-liquid contact environment is formed, which greatly improves the mass transfer efficiency per unit height of packing.

[0028] Enhanced reflux: The lower-temperature reflux liquid effectively cools the rising vapor stream, causing the higher-boiling-point products esters and alcohols to be continuously condensed and liquefied, flowing downwards with the liquid and returning to the reactor to continue participating in the reaction. Meanwhile, the lower-boiling-point water remains in the gas phase and continues to rise to the top of the column, eventually being discharged as a gaseous product.

[0029] Reduced tower height: Due to the synergistic effect of the improved packing distribution scheme and the efficient reflux spray mechanism, the separation effect of traditional tall towers can be achieved with a shorter packing height. Therefore, the esterification tower of this invention successfully reduces the tower height by 2 meters while ensuring separation efficiency, achieving a compact design of the equipment.

[0030] The liquid phase collected at the bottom of the column (mainly crude ester products) is discharged through the bottom outlet. Inhibitors can be added as needed at the inhibitor inlet to prevent certain easily polymerizable ester products from polymerizing inside the column and clogging the equipment. Thermometers at various locations within the column are used to monitor the temperature, providing a basis for process control.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An esterification tower with reflux spraying function, characterized in that, The system includes a head (1), a first cylinder (2), a flange (3), a stiffening plate (4), a grid (5), a second cylinder (6), an ear seat (7), a packing layer (8), a spray distributor (9), a third cylinder (10), a lifting lug (11), and a nozzle assembly (12). The bottom of the first cylinder (2) is provided with a head (1). The upper end of the first cylinder (2) is fixedly connected to the second cylinder (6) through the flange (3). The lower part of the exterior of the second cylinder (6) is provided with an ear seat (7). The bottom of the interior of the second cylinder (6) is connected through... The stiffener (4) is provided with a grid (5) to support the packing. A packing layer (8) is provided above the grid (5). A spray distributor (9) is provided above the packing layer (8). The spray distributor (9) is connected to the return port (13) through a pipe. The upper end of the second cylinder (6) is connected to the third cylinder (10) through a flange. The outer wall of the third cylinder (10) is provided with a lifting lug (11). The pipe assembly (12) is located outside the end cap (1), the first cylinder (2), the second cylinder (6) and the third cylinder (10).

2. The esterification tower with reflux spraying function according to claim 1, characterized in that, The pipe assembly (12) includes a reflux port (13), a bottom outlet (14), a gas inlet (15), a first thermometer port (16), a manhole (17), a gas outlet (18), a second thermometer port (19), and an inhibitor inlet (20). The bottom outlet (14) is located at the bottom of the end cap (1). The first thermometer port (16) and the gas inlet (15) are respectively located on the upper and lower parts of the outer wall of the first cylinder (2). There are two manholes (17), which are respectively located on the upper and lower parts of the outer wall of the second cylinder (6). The reflux port (13), the gas outlet (18), and the second thermometer port (19) are all located on the outer wall of the third cylinder (10). The inhibitor inlet (20) is located on the top of the third cylinder (10).

3. An esterification tower with reflux spraying function according to claim 1, characterized in that, The packing layer (8) is a Pall ring packing layer.

4. An esterification tower with reflux spraying function according to claim 1, characterized in that, The grille (5) is fixed to the inner wall of the second cylinder (6) by stiffeners (4).

5. An esterification tower with reflux spraying function according to claim 1, characterized in that, The spray distributor (9) is configured to atomize the return liquid into a uniform cluster of droplets, the size of which matches the specific surface area of ​​the packing layer (8).

6. An esterification tower with reflux spraying function according to claim 1, characterized in that, The vertical distance H between the lowest point of the spray distributor (9) and the highest point of the packing layer satisfies: 50mm ≤ H ≤ 300mm.

Images