Extraction tower for producing PTA (pure terephthalic acid)

Abstract

The invention relates to the technical field of PTA (pure terephthalic acid) extraction towers, in particular to an extraction tower for producing PTA, which comprises a tower body, two filler supporting pieces are arranged in the tower body in a vertically symmetrical structure, supporting welding pieces are arranged on the filler supporting pieces, and filler pressing assemblies are arranged on one sides, close to the middle of the tower body, of the filler supporting pieces. A filler cavity is formed between the filler supporting pieces and the filler pressing assemblies at the two ends, the upper end of the tower body is communicated with a first feeding distribution pipe, the lower end of the tower body is communicated with a second feeding distribution pipe, and a plurality of tower tray bodies are arranged between the first feeding distribution pipe and the second feeding distribution pipe; odd-numbered layers of tower tray supporting pieces and even-numbered layers of tower tray supports are respectively arranged between adjacent tower tray bodies, the upper end of the tower body is communicated with a light liquid outlet, and the lower end of the tower body is communicated with a heavy liquid outlet. According to the invention, too high or too low local material concentration caused by non-uniform feeding is avoided, the extraction efficiency and quality are improved, the stability and safety of the extraction tower in the operation process are ensured, and a guarantee is provided for continuous and stable operation of PTA production.

Description

Technical Field

[0001] The invention relates to the technical field of PTA extraction towers, in particular to an extraction tower for producing PTA. Background Art

[0002] In the chemical industry, the production of purified terephthalic acid (PTA) is an important link. PTA is mainly used to produce polyester fibers, polyester films and polyester bottles. It has a large market demand, complex production processes and high requirements for equipment. The extraction tower is one of the key equipment in the PTA production process. Its structure and performance directly affect the quality and production efficiency of PTA products.

[0003] After searching, the Chinese patent with announcement number CN102910761A is named as the extraction method to reduce COD in PTA wastewater. First, a large amount of organic carboxylic acids such as benzoic acid, p-methylbenzoic acid, p-carboxybenzyl alcohol, p-carboxybenzaldehyde, and terephthalic acid in the wastewater are extracted with a solvent, and then the residual extractant in the wastewater is removed by gas stripping. The organic carboxylic acids extracted into the extractant phase are returned to the PTA device with the extractant. The p-methylbenzoic acid, p-carboxybenzyl alcohol, p-carboxybenzaldehyde, and terephthalic acid in the organic carboxylic acids are finally converted into PTA products through the PTA device, thereby recovering a large amount of useful organic substances in the wastewater and increasing economic benefits. The method has high efficiency and low energy consumption, which not only reduces COD and reduces the load of the sewage treatment plant, but also partially realizes the resource utilization of wastewater.

[0004] However, during use, it was found that the packing in some extraction towers was easily loosened due to vibration and fluid impact during operation, resulting in poor uniformity of packing distribution, poor mass and heat transfer of materials in the tower, affecting the extraction efficiency. The tower structure and feed distribution pipe restricted the uniform distribution of some fluids, resulting in unsatisfactory extraction effects and even increased risks of deformation and leakage, which was not conducive to the use of extraction in PTA production. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an extraction tower for producing PTA, which avoids excessively high or low local material concentrations caused by uneven feeding, improves the extraction efficiency and quality, ensures the stability and safety of the extraction tower during operation, and provides a guarantee for the continuous and stable operation of PTA production.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: an extraction tower for producing PTA, comprising a tower body, wherein the interior of the tower body is provided with two packing supports in an up-and-down symmetrical structure, the packing supports are provided with supporting welding parts, a packing pressing assembly is provided on one side of the packing support close to the middle of the tower body, a packing cavity is provided between the packing supports and the packing pressing assemblies at both ends, the upper end of the tower body is connected with a first feed distribution pipe, the lower end of the tower body is connected with a second feed distribution pipe, a plurality of tower tray bodies are provided between the first feed distribution pipe and the second feed distribution pipe, odd-numbered tower tray supports and even-numbered tower tray supports are provided between adjacent tower tray bodies, the upper end of the tower body is connected with a light liquid outlet, and the lower end of the tower body is connected with a heavy liquid outlet;

[0007] A blocking plate is installed at one end of the first feed distribution pipe located inside the tower body, a reinforcement ring is provided at the contact between the outer peripheral wall of the first feed distribution pipe and the tower body, a flange is provided at the outer end of the first feed distribution pipe, and a distribution groove is opened on the bottom surface of the first feed distribution pipe.

[0008] Preferably, the outer wall of the first feed distribution pipe is sleeved with a U-shaped bolt, a first pad is inserted on the U-shaped bolt, two third ribs are fixed on the bottom surface of the first pad, and the first pad and the two third ribs are respectively fixed to the outer wall of the tower body.

[0009] Through the above technical solution, the initial positioning and support of the first feed distribution pipe is achieved.

[0010] Preferably, the U-shaped bolt passes through the first pad and extends to the lower end, washers are respectively sleeved on both ends of the U-shaped bolt, nuts are abutted against the outer walls of the washers, and the two nuts are respectively threadedly connected to the threaded ends of the U-shaped bolt through threaded holes.

[0011] Through the above technical solution, the first feed distribution pipe is firmly fixed on the tower body.

[0012] Preferably, the supporting weldment is provided with a supporting rib plate, and a plurality of the supporting rib plates are provided in a ring array structure, the outer wall of the supporting rib plate is slidably connected to the inner wall of the tower body, a supporting ring plate is provided inside the tower body, and the inner ends of the supporting rib plates are respectively fixedly connected to the outer wall of the supporting ring plate.

[0013] Through the above technical solution, the inner end of the supporting rib plate is fixedly connected to the outer wall of the supporting ring plate to form a stable supporting skeleton, thereby enhancing the stability of the entire supporting structure.

[0014] Preferably, the supporting welding part comprises a second pad, a plurality of the second pads are provided, an outer wall of the second pad is fixed on the inner wall of the tower body, and a supporting plate is fixed on the outer wall of the lower end of the second pad.

[0015] Preferably, the top surface of the support plate is respectively fixed with a first rib plate and a second rib plate, the first rib plate and the second rib plate have the same height, the first rib plate and the second rib plate are both trapezoidal, and the top surfaces of the first rib plate and the second rib plate are respectively abutted against the bottom surface of the support ring plate.

[0016] Through the above technical solution, the trapezoidal structural design of the first rib plate and the second rib plate enables it to better withstand the vertical pressure and evenly distribute the pressure to the support plate and the tower body, thereby ensuring that the packing support member stably supports the packing.

[0017] Preferably, the packing pressing assembly comprises an angle steel, the angle steel is L-shaped, a plurality of grid plates are abutted against the angle steel, and adjacent grid plates are screwed together by first bolts.

[0018] Through the above technical solution, a plurality of grid plates form an integral structure, which blocks and restricts the movement of the filler.

[0019] Preferably, two angle steels are symmetrically structured, and both ends of the angle steels are respectively in contact with connecting plates, and the inner walls of the connecting plates are fixedly connected to the inner walls of the tower body.

[0020] Through the above technical solution, the L-shaped angle steel is tightly in contact with the grid plate, and pressure is applied to the grid plate from the outside to prevent the grid plate from spreading in the horizontal direction.

[0021] Preferably, through holes are respectively provided at both ends of the angle steel and on the connecting plate, and second bolts are inserted into the through holes, and one end of the second bolt abuts against the outer wall of the angle steel.

[0022] Preferably, the stud ends of the first bolt and the second bolt are both sleeved with toothed nuts, and the two toothed nuts are threadedly connected to the stud ends of the first bolt and the second bolt, respectively.

[0023] Through the above technical solution, the angle steel is fixed to the tower body by inserting the second bolt through the through holes opened at both ends of the angle steel and the connecting plate and fixing it through the threaded connection of the toothed nut, thereby providing stable support and clamping force for the grid plate.

[0024] Beneficial effects of the present invention:

[0025] 1. In the present invention, the distribution groove on the bottom surface of the first feed distribution pipe makes the material entering the upper part of the tower body more evenly distributed, avoiding excessive or low local material concentration caused by uneven feeding, and improving the extraction efficiency and quality; the reinforcement ring at the contact point between the outer peripheral wall of the first feed distribution pipe and the tower body enhances the strength of the connection between the feed pipe and the tower body, reduces the risk of deformation and leakage, ensures the stability and safety of the extraction tower during operation, and provides guarantee for the continuous and stable operation of PTA production.

[0026] By tightening the nut, the gasket is tightly abutted against the first pad, thereby further firmly fixing the first feed distribution pipe on the tower body; during the feeding process, this fixing method can better withstand the impact force and vibration generated by the flow of materials in the feed pipe, prevent the feed pipe from being displaced or loosened, ensure the stability and continuity of the feed, and thus ensure the stable operation of the entire extraction process. At the same time, it facilitates the disassembly and installation of the first feed distribution pipe.

[0027] 2. In the present invention, the inner end of the supporting rib plate is fixedly connected to the outer wall of the supporting ring plate to form a stable supporting skeleton, which evenly disperses the force acting on the filler support member to the supporting ring plate, and then transmits the force to the tower body through the supporting ring plate, thereby enhancing the stability of the entire supporting structure and improving the extraction efficiency and product quality; the second pad is fixed to the inner wall of the tower body, providing a reliable attachment point for the supporting structure, and the support plate and the first and second rib plates thereon are abutted against the bottom surface of the supporting ring plate, further enhancing the stability of the supporting ring plate and preventing it from being displaced in the vertical direction.

[0028] 3. In the present invention, the trapezoidal structure design of the first rib plate and the second rib plate enables them to better withstand the vertical pressure and evenly distribute the pressure to the support plate and the tower body, thereby ensuring the stable support of the packing support member to the supporting packing, maintaining the uniform distribution of the packing in the tower, ensuring that the material is fully in contact and transfers mass and heat when passing through the packing layer, ensuring the efficient and stable extraction process, and ensuring the continuity of PTA production.

[0029] 4. In the present invention, adjacent grid plates are screwed together by first bolts and toothed nuts, so that multiple grid plates form an integral structure, which blocks and restricts the movement of the filler. The L-shaped angle steel is tightly in contact with the grid plate, and pressure is applied to the grid plate from the outside to prevent the grid plate from spreading in the horizontal direction, thereby ensuring that the filler is stably confined in the filler cavity. The two ends of the angle steel are respectively in contact with the connecting plate, and the inner wall of the connecting plate is fixed to the inner wall of the tower body. The second bolt is inserted through the through holes opened at the two ends of the angle steel and the connecting plate and fixed by threaded connection with the toothed nut, thereby fixing the angle steel to the tower body, providing stable support and clamping force for the grid plate, ensuring that the position of the entire filler clamping assembly is fixed in the tower body, reducing the loosening of the bolts due to factors such as vibration during the operation of the equipment, ensuring the stability and reliability of the filler clamping assembly, maintaining the distribution state of the filler, and ensuring the stable progress of the extraction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the distribution trough structure of the present invention;

[0032] Figure 3This is a schematic diagram of the structure of the first feed distribution pipe of the present invention;

[0033] Figure 4 It is a left view of the U-bolt structure of the present invention;

[0034] Figure 5 A top view of the second rib plate structure of the present invention;

[0035] Figure 6 It is an enlarged schematic diagram of the structure at A of the present invention;

[0036] Figure 7 It is a side view of the second pad structure of the present invention;

[0037] Figure 8 A top view of the support plate structure of the present invention;

[0038] Fig. 9 It is a schematic diagram of the angle steel structure of the present invention;

[0039] Fig.10 It is a schematic diagram of the assembly of the grid plate structure of the present invention;

[0040] Fig.11 It is a schematic diagram of the angle steel structure assembly of the present invention.

[0041] In the figure: 1. packing support; 107. support welding piece; 1071. support rib plate; 1072. support ring plate; 1073. first rib plate; 1074. second rib plate; 1075. second pad plate; 1076. support plate; 2. packing cavity; 3. packing clamping assembly; 301. grid plate; 302. angle steel; 303. connecting plate; 304. first bolt; 305. second bolt; 306. flower tooth screw 4. Second feed distribution pipe; 5. Odd-numbered tray support; 6. Even-numbered tray support; 7. Tray body; 8. First feed distribution pipe; 801. Blocking plate; 802. Reinforcement ring; 803. Flange; 804. Distribution trough; 805. U-bolt; 806. Washer; 807. Nut; 808. First pad; 809. Third rib plate; 9. Tower body; 10. Heavy liquid outlet; 11. Light liquid outlet. DETAILED DESCRIPTION

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0043] Embodiment 1, as Figures 1 to 4As shown, this embodiment provides an extraction tower for producing PTA, including a tower body 9, the interior of the tower body 9 is provided with two packing support members 1 in an upper and lower symmetrical structure, the packing support member 1 is provided with a supporting welding member 107, a packing pressing assembly 3 is provided on one side of the packing support member 1 close to the middle of the tower body 9, a packing cavity 2 is provided between the packing support members 1 and the packing pressing assembly 3 at both ends, the upper end of the tower body 9 is connected with a first feed distribution pipe 8, the lower end of the tower body 9 is connected with a second feed distribution pipe 4, a plurality of tray bodies 7 are provided between the first feed distribution pipe 8 and the second feed distribution pipe 4, odd-numbered tray supports 5 and even-numbered tray supports 6 are provided between adjacent tray bodies 7, the upper end of the tower body 9 is connected with a light liquid outlet 11, and the lower end of the tower body 9 is connected with a heavy liquid outlet 10;

[0044] A blocking plate 801 is installed at one end of the first feed distribution pipe 8 located inside the tower body 9, a reinforcement ring 802 is provided at the contact point between the outer peripheral wall of the first feed distribution pipe 8 and the tower body 9, a flange 803 is provided at the outer end of the first feed distribution pipe 8, and a distribution groove 804 is opened on the bottom surface of the first feed distribution pipe 8.

[0045] The outer wall of the first feed distribution pipe 8 is sleeved with a U-shaped bolt 805, on which the first pad 808 is inserted, and two third ribs 809 are fixed to the bottom surface of the first pad 808. The first pad 808 and the two third ribs 809 are respectively fixed to the outer wall of the tower body 9, thereby realizing the preliminary positioning and support of the first feed distribution pipe 8.

[0046] The U-shaped bolt 805 passes through the first pad 808 and extends to the lower end. Washers 806 are respectively sleeved on both ends of the U-shaped bolt 805. Nuts 807 are abutted against the outer wall of the washers 806. The two nuts 807 are respectively threadedly connected to the threaded ends of the U-shaped bolt 805 through threaded holes; the first feed distribution pipe 8 is firmly fixed on the tower body 9.

[0047] When the extraction tower is in operation, the materials enter the tower from the first feed distribution pipe 8 at the upper end of the tower body 9 and the second feed distribution pipe 4 at the lower end. The blocking plate 801 inside the first feed distribution pipe 8 blocks the flow of the materials, so that the materials enter the upper space of the tower body 9 evenly from the distribution groove 804 at the bottom. Similarly, the second feed distribution pipe 4 allows the materials to enter the lower part of the tower body 9 evenly. After the materials enter the tower body 9, they fully contact with the fillers in the filler cavity 2 defined by the filler support 1 and the filler pressing assembly 3 symmetrically arranged above and below to carry out preliminary mass transfer and heat transfer processes.

[0048] At the same time, the odd-numbered tray supports 5 and the even-numbered tray supports 6 arranged between adjacent tray bodies 7 provide stable support for the trays. The material undergoes further mass transfer, heat transfer and other extraction processes when passing through each tray. Due to the density difference, the light liquid is finally discharged from the light liquid outlet 11 at the upper end of the tower body 9, and the heavy liquid is discharged from the heavy liquid outlet 10 at the lower end of the tower body 9, thereby achieving the separation and extraction of different components in PTA production.

[0049] The distribution groove 804 at the bottom of the first feed distribution pipe 8 makes the material entering the upper part of the tower body 9 more evenly distributed, avoiding the local material concentration being too high or too low due to uneven feeding, and improving the extraction efficiency and quality; the reinforcement ring 802 at the contact point between the outer peripheral wall of the first feed distribution pipe 8 and the tower body 9 enhances the strength of the connection between the feed pipe and the tower body 9, reduces the risk of deformation and leakage, ensures the stability and safety of the extraction tower during operation, and provides guarantee for the continuous and stable operation of PTA production; the filler support 1 and the support welding part 107 thereon provide stable support for the filler, ensuring the stability of the initial position of the filler in the tower;

[0050] The U-shaped bolt 805 is sleeved on the outer peripheral wall of the first feed distribution pipe 8. By inserting the first pad 808 on the U-shaped bolt 805, the two third ribs 809 on the bottom surface of the first pad 808 are fixed to the outer wall of the tower body 9, thereby achieving the preliminary positioning and support of the first feed distribution pipe 8; then, the U-shaped bolt 805 passes through the first pad 808 and extends downward. After the washers 806 are sleeved on both ends of the U-shaped bolt 805, the nut 807 is used to be threadedly connected with the threaded end of the U-shaped bolt 805;

[0051] By tightening the nut 807, the gasket 806 is tightly abutted against the first pad 808, thereby further firmly fixing the first feed distribution pipe 8 on the tower body 9; during the feeding process, this fixing method can better withstand the impact force and vibration generated by the flow of materials in the feed pipe, prevent the feed pipe from being displaced or loosened, ensure the stability and continuity of the feed, and thus ensure the stable operation of the entire extraction process. At the same time, it facilitates the disassembly and installation of the first feed distribution pipe 8.

[0052] Embodiment 2, as Figure 1 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, this embodiment is based on the previous embodiment, and differs from the previous embodiment in that a support rib 1071 is provided on the support weldment 107, and a plurality of support ribs 1071 are provided in a ring array structure, and the outer wall of the support rib 1071 is slidably connected to the inner wall of the tower body 9, and a support ring plate 1072 is provided inside the tower body 9, and the inner ends of the support ribs 1071 are fixedly connected to the outer walls of the support ring plates 1072 respectively; the inner ends of the support ribs 1071 are fixedly connected to the outer walls of the support ring plates 1072 to form a stable support skeleton, thereby enhancing the stability of the entire support structure.

[0053] The supporting welded part 107 includes a second pad 1075, and a plurality of second pads 1075 are provided. The outer wall of the second pad 1075 is fixed on the inner wall of the tower body 9, and a support plate 1076 is fixed on the outer wall of the lower end of the second pad 1075. The top surfaces of the support plate 1076 are respectively fixed with a first rib plate 1073 and a second rib plate 1074. The first rib plate 1073 and the second rib plate 1074 have the same height, and the first rib plate 1073 and the second rib plate 1074 are both trapezoidal in shape. The top surfaces of the first rib plate 1073 and the second rib plate 1074 are respectively abutted against the bottom surface of the support ring plate 1072; the trapezoidal structural design of the first rib plate 1073 and the second rib plate 1074 enables it to better withstand the vertical pressure and evenly distribute the pressure to the support plate 1076 and the tower body 9, thereby ensuring that the packing support 1 stably supports the supporting packing.

[0054] When in use, the multiple support ribs 1071 in the support weldment 107 are distributed in a ring array, and the outer wall thereof is slidably connected to the inner wall of the tower body 9, so that the support ribs 1071 can adapt to the slight deformation or thermal expansion and contraction inside the tower body 9 to a certain extent, while maintaining its own relatively stable position; the inner end of the support rib 1071 is fixedly connected to the outer wall of the support ring plate 1072 to form a stable support skeleton, which evenly disperses the force acting on the filler support 1 to the support ring plate 1072, and then transmits the force to the tower body 9 through the support ring plate 1072, thereby enhancing the stability of the entire support structure and improving the extraction efficiency and product quality;

[0055] The second pad 1075 is fixed on the inner wall of the tower body 9, providing a reliable attachment point for the support structure. The support plate 1076 and the first rib plate 1073 and the second rib plate 1074 thereon abut against the bottom surface of the support ring plate 1072, further enhancing the stability of the support ring plate 1072 and preventing it from being displaced in the vertical direction.

[0056] The trapezoidal structural design of the first rib plate 1073 and the second rib plate 1074 enables it to better withstand the vertical pressure and evenly distribute the pressure to the support plate 1076 and the tower body 9, thereby ensuring the stable support of the packing support 1 for the supporting packing, maintaining the uniform distribution of the packing in the tower, ensuring sufficient contact and mass and heat transfer of the materials when passing through the packing layer, ensuring the efficient and stable progress of the extraction process, and ensuring the continuity of PTA production.

[0057] Embodiment three, as Figure 1 , Fig. 9 , Fig.10 and Fig.11 As shown, this embodiment is based on the previous embodiment, and is different from the previous embodiment in that the filler clamping assembly 3 includes an angle steel 302, which is L-shaped, and a plurality of grid plates 301 are abutted on the angle steel 302, and adjacent grid plates 301 are screwed together by first bolts 304; the plurality of grid plates 301 form an integral structure, which blocks and restricts the movement of the filler.

[0058] Two angle steels 302 are symmetrically arranged, and the two ends of the angle steels 302 are respectively in contact with connecting plates 303, and the inner wall of the connecting plate 303 is fixedly connected to the inner wall of the tower body 9; the L-shaped angle steel 302 is tightly in contact with the grid plate 301, and pressure is applied to the grid plate 301 from the outside to prevent the grid plate 301 from spreading in the horizontal direction.

[0059] Through holes are respectively provided at both ends of the angle steel 302 and the connecting plate 303, and a second bolt 305 is inserted into the through hole, one end of the second bolt 305 is in contact with the outer wall of the angle steel 302, and the stud ends of the first bolt 304 and the second bolt 305 are both sleeved with a toothed nut 306, and the two toothed nuts 306 are respectively threadedly connected with the stud ends of the first bolt 304 and the second bolt 305; the second bolt 305 is inserted into the through holes provided at both ends of the angle steel 302 and the connecting plate 303 and fixed by threading with the toothed nut 306, so that the angle steel 302 is fixed on the tower body 9, providing stable support and pressing force for the grid plate 301.

[0060] When in use, adjacent grid plates 301 are screwed together by first bolts 304 and toothed nuts 306, so that multiple grid plates 301 form an integral structure, blocking and restricting the movement of the filler. The L-shaped angle steel 302 is in close contact with the grid plate 301, and applies pressure to the grid plate 301 from the outside to prevent the grid plate 301 from spreading in the horizontal direction, thereby ensuring that the filler is stably confined in the filler cavity 2.

[0061] The two ends of the angle steel 302 are respectively in contact with the connecting plate 303, and the inner wall of the connecting plate 303 is fixed to the inner wall of the tower body 9. The second bolt 305 is inserted through the through holes opened at the two ends of the angle steel 302 and the connecting plate 303 and fixed by threaded connection with the toothed nut 306, so that the angle steel 302 is fixed to the tower body 9, providing stable support and clamping force for the grid plate 301, ensuring that the position of the entire filler clamping assembly 3 in the tower body 9 is fixed, reducing the loosening of the bolts due to factors such as vibration during the operation of the equipment, ensuring the stability and reliability of the filler clamping assembly 3, maintaining the distribution state of the filler, and ensuring the stable progress of the extraction process.

[0062] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An extraction tower for producing PTA, comprising a tower body (9), characterized in that: The tower body (9) is provided with two packing support members (1) in an upper and lower symmetrical structure. The packing support members (1) are provided with support welding members (107). A packing pressing assembly (3) is provided on one side of the packing support member (1) close to the middle of the tower body (9). A packing cavity (2) is provided between the packing support members (1) and the packing pressing assembly (3) at both ends. The upper end of the tower body (9) is connected to a first feed distribution pipe (8), and the lower end of the tower body (9) is connected to a second feed distribution pipe (4). A plurality of tower tray bodies (7) are provided between the first feed distribution pipe (8) and the second feed distribution pipe (4). An odd-numbered-layer tower tray support member (5) and an even-numbered-layer tower tray support member (6) are provided between adjacent tower tray bodies (7). The upper end of the tower body (9) is connected to a light liquid outlet (11), and the lower end of the tower body (9) is connected to a heavy liquid outlet (10). A blocking plate (801) is installed at one end of the first feed distribution pipe (8) located inside the tower body (9), a reinforcing ring (802) is provided at the contact point between the outer wall of the first feed distribution pipe (8) and the tower body (9), a flange (803) is provided at the outer end of the first feed distribution pipe (8), and a distribution groove (804) is provided on the bottom surface of the first feed distribution pipe (8).

2. The extraction tower for producing PTA according to claim 1, characterized in that: The outer wall of the first feed distribution pipe (8) is sleeved with a U-shaped bolt (805), and the U-shaped bolt (805) is plugged with a first pad (808). The bottom surface of the first pad (808) is fixed with two third ribs (809), and the first pad (808) and the two third ribs (809) are respectively fixed to the outer wall of the tower body (9).

3. The extraction tower for producing PTA according to claim 2, characterized in that: The U-shaped bolt (805) passes through the first pad (808) and extends to the lower end. Washers (806) are respectively sleeved on both ends of the U-shaped bolt (805). Nuts (807) are abutted against the outer walls of the washers (806). The two nuts (807) are respectively threadedly connected to the threaded ends of the U-shaped bolt (805) through threaded holes.

4. The extraction tower for producing PTA according to claim 1, characterized in that: The supporting welded part (107) is provided with a supporting rib plate (1071), and a plurality of the supporting rib plates (1071) are provided in a ring array structure. The outer wall of the supporting rib plate (1071) is slidably connected to the inner wall of the tower body (9). A supporting ring plate (1072) is provided inside the tower body (9), and the inner ends of the supporting rib plates (1071) are respectively fixedly connected to the outer walls of the supporting ring plates (1072).

5. The extraction tower for producing PTA according to claim 4, characterized in that: The supporting welding member (107) comprises a second pad (1075), a plurality of the second pads (1075) are provided, the outer wall of the second pad (1075) is fixedly arranged on the inner wall of the tower body (9), and a support plate (1076) is fixedly arranged on the outer wall of the lower end of the second pad (1075).

6. The extraction tower for producing PTA according to claim 5, characterized in that: The top surface of the support plate (1076) is respectively fixed with a first rib plate (1073) and a second rib plate (1074), the first rib plate (1073) and the second rib plate (1074) have the same height, the first rib plate (1073) and the second rib plate (1074) are both trapezoidal in shape, and the top surfaces of the first rib plate (1073) and the second rib plate (1074) are respectively in contact with the bottom surface of the support ring plate (1072).

7. The extraction tower for producing PTA according to claim 1, characterized in that: The packing pressing assembly (3) comprises an angle steel (302) which is L-shaped. A plurality of grid plates (301) are abutted against the angle steel (302), and adjacent grid plates (301) are screwed together by first bolts (304).

8. The extraction tower for producing PTA according to claim 7, characterized in that: The angle steels (302) are provided with two symmetrical structures, and the two ends of the angle steels (302) are respectively in contact with connecting plates (303), and the inner wall of the connecting plate (303) is fixedly connected to the inner wall of the tower body (9).

9. The extraction tower for producing PTA according to claim 8, characterized in that: Through holes are respectively provided at both ends of the angle steel (302) and on the connecting plate (303), and a second bolt (305) is inserted into the through hole. One end of the second bolt (305) abuts against the outer wall of the angle steel (302).

10. The extraction tower for producing PTA according to claim 9, characterized in that: The stud ends of the first bolt (304) and the second bolt (305) are both sleeved with toothed nuts (306), and the two toothed nuts (306) are respectively threadedly connected to the stud ends of the first bolt (304) and the second bolt (305).

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