Methanol recovery tank for methylparaben production

Abstract

The utility model discloses a methanol recovery tank for methylparaben production, which comprises a methanol recovery tank, a cleaning mechanism is arranged in the methanol recovery tank, the cleaning mechanism comprises a horizontal rotating shaft, the horizontal rotating shaft is driven by a second rotating motor to rotate, a plurality of cleaning brushes are arranged outside the second rotating motor, and the cleaning brushes are connected with the cleaning mechanism. Bristles are arranged on the side, away from the horizontal rotating shaft, of the cleaning brush, a distance adjusting mechanism is arranged between the cleaning brush and the horizontal rotating shaft, the distance adjusting mechanism comprises fixed supporting discs symmetrically arranged at the two ends of the horizontal rotating shaft, gear discs are arranged on the sides, close to each other, of the two fixed supporting discs, and the gear discs are rotationally installed outside the horizontal rotating shaft. According to the cleaning mechanism in the methanol recovery tank, the distance adjusting mechanism is arranged between the cleaning brush and the horizontal rotating shaft, and the distance between the cleaning brush and the horizontal rotating shaft can be adjusted according to the abrasion condition of the bristles, so that the bristles can continuously and effectively brush the inner wall of the methanol recovery tank, and the replacement frequency of the cleaning brush is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of methylparaben production, in particular to a methanol recovery tank for methylparaben production. Background Art

[0002] Methylparaben, as an important chemical product, is widely used in cosmetics, food, medicine, and other fields. Its traditional production process primarily involves an esterification reaction between p-hydroxybenzoic acid and methanol under the catalysis of sulfuric acid to produce methylparaben. The finished product then undergoes a complex series of steps, including dealcoholization, neutralization, hydrolysis, centrifugal filtration, dissolution and decolorization, filtration and distillation, crystallization and centrifugation, and double-cone drying.

[0003] The reaction equation is as follows:

[0004]

[0005] In existing methylparaben production processes, the methanol recovery tank cleaning equipment used in the methanol recovery process is often inadequate. The cleaning brushes wear out over time, and the inability to easily adjust the distance between the brush and the tank wall reduces cleaning effectiveness. This necessitates frequent brush replacement, increasing production costs and maintenance workload, and reducing the economic viability and sustainability of the entire production process. Utility Model Content

[0006] In order to solve the problems mentioned in the above background technology, the utility model provides a methanol recovery tank for methylparaben production.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A methanol recovery tank for methylparaben production comprises a methanol recovery tank, wherein a cleaning mechanism is installed inside the methanol recovery tank, wherein the cleaning mechanism comprises a horizontal rotating shaft driven to rotate by a second rotating motor, wherein a plurality of cleaning brushes are installed outside the second rotating motor, wherein bristles are provided on a side of the cleaning brush away from the horizontal rotating shaft, and a spacing adjustment mechanism is provided between the cleaning brush and the horizontal rotating shaft.

[0009] Preferably, the spacing adjustment mechanism includes fixed support plates symmetrically arranged at both ends of the horizontal rotating shaft, and a gear plate is provided on the side where the two fixed support plates are close to each other. The gear plate is rotatably installed on the outside of the horizontal rotating shaft, and a plurality of connecting frames are slidably installed on the side of the fixed support plate close to the gear plate through a slide rail. A limiting rod is fixed on the connecting frame, and a plurality of arc-shaped limiting slots are opened on the gear plate, and the limiting rod passes through the gear plate through the arc-shaped limiting slots.

[0010] Preferably, a connecting bar is fixed between the pair of connecting frames, and the cleaning brush is fixed to the connecting bar.

[0011] Preferably, a third spur gear is rotatably mounted on the fixed support plate, the third spur gear is engaged with the gear plate, and a synchronization shaft is connected between the two third spur gears.

[0012] Preferably, a multi-deformable sleeve is fixed to one end of the synchronization shaft, an adjustment shaft is movably installed on the methanol recovery tank, and a polygonal pin corresponding to the adjustment shaft is fixed to one end close to the multi-deformable sleeve.

[0013] Preferably, one end of the adjustment shaft away from the polygonal pin extends to the outside of the methanol recovery tank and is fixed with a handwheel.

[0014] Preferably, the adjusting shaft is movable and passes through the side wall of the methanol recovery tank, can move horizontally and rotate, and a mechanical seal is provided on the outside of the adjusting shaft.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. The cleaning mechanism inside the methanol recovery tank is equipped with a spacing adjustment mechanism between the cleaning brush and the horizontal rotating shaft. The spacing between the cleaning brush and the horizontal rotating shaft can be adjusted according to the wear of the brush bristles, so that the bristles can continuously and effectively scrub the inner wall of the methanol recovery tank, reducing the frequency of cleaning brush replacement;

[0017] 2. The spacing adjustment mechanism, through the fixed support plate, gear plate, connecting frame, limit rod and other components, cooperates with the third spur gear and synchronous shaft to synchronously and stably adjust the position of the cleaning brush from both ends of the horizontal shaft to ensure that the cleaning brush is parallel to the inner wall of the methanol recovery tank. The spacing can be easily adjusted through the handwheel, adjustment shaft, polygonal sleeve and polygonal pin. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a flow chart of the utility model;

[0020] Figure 2 This is a three-dimensional diagram of the esterification kettle of the present utility model;

[0021] Figure 3 for Figure 2 A magnified detail of position A in the middle;

[0022] Figure 4 This is a sectional view of the esterification kettle of the utility model from the main perspective;

[0023] Figure 5 This is a three-dimensional cross-sectional view of the esterification kettle of the present utility model;

[0024] Figure 6 This is an enlarged detail diagram of the liquid distributor of the present invention;

[0025] Figure 7 for Figure 6 Enlarged detail of position B in the middle;

[0026] Figure 8 This is a schematic diagram of the internal structure of the esterification kettle of the present utility model;

[0027] Figure 9 This is a cross-sectional view of the buffer container of the present utility model;

[0028] Figure 10 for Figure 9 Enlarged detail image of the middle C position;

[0029] Figure 11 This is a cross-sectional view of the vertical drive box of the present utility model from the first perspective;

[0030] Figure 12 for Figure 11 Enlarged detail image of the middle D position;

[0031] Figure 13 This is a cross-sectional view of the vertical drive box of the present utility model from a second perspective;

[0032] Figure 14 for Figure 13 Enlarged detail of position E in the middle;

[0033] Figure 15 This is a cross-sectional view from the first perspective of the methanol recovery tank of the present invention;

[0034] Figure 16 This is a cross-sectional view of the methanol recovery tank of the present invention from a second perspective;

[0035] Figure 17 for Figure 16 Enlarged detail image of the F position in the middle;

[0036] Figure 18 This is an enlarged detail view of the horizontal rotating shaft of the utility model;

[0037] Figure 19 This is an enlarged detail view of the gear plate position of the present invention;

[0038] Figure 20 This is an enlarged detail view of the fixed support plate position of the present invention;

[0039] In the figure: 1. esterification kettle; 101. jacket; 2. condenser; 3. methanol recovery tank; 301. horizontal shaft; 302. second rotating motor; 303. cleaning brush; 3031. bristles; 304. fixed support plate; 305. slide rail; 3051. connecting frame; 3052. connecting bar; 3053. limit rod; 306. gear plate; 3061. arc-shaped limit slot; 307. synchronization shaft; 3071. third spur gear; 3072. polygonal sleeve; 3073. adjustment shaft; 3074. hand wheel; 3075. polygonal latch; 4. vertical shaft; 401. rotary joint; 402. methanol inlet pipe; 403. agitator; 5. buffer container; 501. Pressurizing piston; 502, elastic telescopic rod; 503, vertical drive box; 504, cleaning scraper; 505, reciprocating screw; 506, lifting threaded sleeve; 507, second spur gear; 508, gear ring; 509, first magnet; 510, second magnet; 511, scraper; 6, liquid distributor; 601, distribution pipe; 602, liquid nozzle; 603, horizontal movable rod; 604, sealing plug; 605, return spring; 606, first vertical bar; 607, telescopic guide rod; 608, second vertical bar; 609, trigger member; 610, guide ring; 611, arc-shaped protrusion; 612, rack; 613, first spur gear; 7, centrifugal filtration and drying device; 8, distillation tower. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] Example 1

[0042] Reference Figure 1-20 A methanol recovery tank for methyl paraben production includes an esterification kettle 1, a condenser 2, and a methanol recovery tank 3. A jacket 101 is installed on the outside of the esterification kettle 1. A vertical rotating shaft 4 is rotatably installed on the top of the esterification kettle 1. The bottom end of the vertical rotating shaft 4 extends into the interior of the esterification kettle 1 and a buffer container 5 is fixed on the outside. An agitator 403 is fixed to the bottom end of the vertical rotating shaft 4. The vertical rotating shaft 4 is hollow and communicates with the buffer container 5. The top end of the vertical rotating shaft 4 is connected to a methanol introduction pipe 402 through a rotary joint 401. The bottom end of the buffer container 5 is connected to a liquid distributor 6.

[0043] The esterification reactor 1 sucks an appropriate amount of solid p-hydroxybenzoic acid by vacuum, and then introduces methanol through the methanol introduction pipe 402. Stirring is performed during the introduction of methanol to promote the mixing of methanol and hydroxybenzoic acid and accelerate the esterification reaction. After the reaction is completed, the material is centrifuged and filtered by a centrifugal filter drying device 7. The wet material is dried, and the mother liquor is added to a distillation tower 8 for distillation. After distillation, it is condensed and recovered in a condenser 2 and then recycled to a methanol recovery tank 3 for reuse.

[0044] The liquid distributor 6 is used to improve the dispersion of methanol and the mixing effect.

[0045] The top of the esterification kettle 1 is fixed with a first rotating motor 405, the output shaft of the first rotating motor 405 is fixed with a first bevel gear 406, the outside of the vertical rotating shaft 4 is fixed with a second bevel gear 404, and the first bevel gear 406 and the second bevel gear 404 are meshed with each other;

[0046] By turning on the first rotating motor 405 , the first rotating motor 405 drives the first bevel gear 406 to rotate, and the first bevel gear 406 engages with the second bevel gear 404 to drive the vertical rotating shaft 4 to rotate, thereby driving the agitator 403 to stir.

[0047] Example 2

[0048] Reference Figure 1-20 The difference between this embodiment and embodiment 1 is that the liquid distributor 6 includes a plurality of distribution pipes 601, and the distribution pipes 601 are connected to a plurality of liquid nozzles 602, the liquid nozzles 602 are arranged horizontally, and the plurality of liquid nozzles 602 are evenly distributed in the vertical direction;

[0049] Methanol first enters the buffer container 5, then dispersed into each distribution pipe 601, and then dispersed and sprayed out through the liquid nozzle 602 to improve the mixing effect. When the vertical shaft 4 rotates, it can drive the buffer container 5 to rotate, thereby driving the distribution pipe 601 to follow and move, further improving the mixing effect.

[0050] Example 3

[0051] Reference Figure 1-20 The difference between this embodiment and embodiment 2 is that a horizontal movable rod 603 is installed in the distribution pipe 601 at a position corresponding to the liquid nozzle 602, a return spring 605 is installed on the outside of the horizontal movable rod 603, and a sealing plug 604 corresponding to the liquid nozzle 602 is fixed at one end of the horizontal movable rod 603;

[0052] The return spring 605 pushes the sealing plug 604 to block the liquid nozzle 602 in the state without receiving external force.

[0053] Among them, the other end of the horizontal movable rod 603 extends to the outside of the distribution pipe 601 and multiple horizontal movable rods 603 are fixed to the first vertical bar 606. The outer wall of the distribution pipe 601 is connected to the second vertical bar 608 through a telescopic guide rod 607. A rack 612 is fixed on the side where the first vertical bar 606 and the second vertical bar 608 are close to each other. A first straight gear 613 is provided between the two racks 612. Both racks 612 are engaged with the first straight gear 613. A trigger member 609 is fixed on the side of the second vertical bar 608 away from the distribution pipe 601. The trigger member 609 is a circular ring structure. A guide ring 610 is fixed on the inner wall of the esterification kettle 1. A plurality of arc-shaped protrusions 611 are evenly distributed on the guide ring 610;

[0054] When the buffer container 5 rotates following the vertical rotating shaft 4, the distribution pipe 601 follows and moves. At this time, the trigger member 609 moves along the inner ring of the guide ring 610. When the trigger member 609 moves to the position of the arc-shaped protrusion 611, the second vertical bar 608 is pushed toward the first vertical bar 606. At this time, since the two racks 612 are engaged with the first straight gear 613, the first vertical bar 606 can also be driven to move toward the second vertical bar 608. At this time, the return spring 605 is compressed, and the sealing plug 604 leaves the liquid nozzle 602. The liquid nozzle 602 can be opened intermittently, so that methanol is sprayed intermittently, which can increase the pressure of the methanol spray and improve the mixing effect.

[0055] A pressurizing piston 501 is installed in the buffer container 5. An elastic telescopic rod 502 is provided between the pressurizing piston 501 and the inner wall of the top end of the pressurizing piston 501. The elastic telescopic rod 502 is used to store energy. The communication opening between the vertical rotating shaft 4 and the buffer container 5 is located below the pressurizing piston 501.

[0056] Methanol is continuously transported into the buffer container 5. When the liquid nozzle 602 is in a blocked state, the hydraulic pressure will rise. At this time, the pressurizing piston 501 is pushed upward, and the elastic telescopic rod 502 is compressed to store energy. When the liquid nozzle 602 is opened, the elastic telescopic rod 502 will push the pressurizing piston 501 downward to pressurize the methanol, thereby increasing the pressure when the methanol is sprayed out.

[0057] Example 4

[0058] Reference Figure 1-20 The difference between this embodiment and embodiment 1 is that a vertical drive box 503 is fixed to one side of the buffer container 5, a cleaning scraper 504 is fixed to the side of the vertical drive box 503 away from the buffer container 5, and a scraper 511 is connected to the output end of the vertical drive box 503. The scraper 511 contacts the surface of the cleaning scraper 504, and the cleaning scraper 504 contacts the inner wall of the esterification kettle 1;

[0059] When the buffer container 5 rotates, it drives the vertical drive box 503 and the cleaning scraper 504 to rotate accordingly, thereby driving the cleaning scraper 504 to scrape the inner wall of the esterification kettle 1, thereby scraping off crystals and preventing the material from remaining on the inner wall of the esterification kettle 1 and being unable to be discharged. The vertical drive box 503 drives the scraper 511 to move vertically along the surface of the cleaning scraper 504, thereby cleaning the surface of the cleaning scraper 504.

[0060] A reciprocating screw 505 is installed inside the vertical drive box 503, and a lifting threaded sleeve 506 is installed outside the reciprocating screw 505. A first magnet 509 is fixed to the lifting threaded sleeve 506. A second magnet 510 is installed outside the vertical drive box 503. The first magnet 509 and the second magnet 510 attract each other across the side wall of the vertical drive box 503, and a scraper 511 is fixed to the second magnet 510. A second spur gear 507 is fixed to the top of the reciprocating screw 505. A gear ring 508 is fixed inside the esterification kettle 1, and the second spur gear 507 is meshed with the gear ring 508.

[0061] When the buffer container 5 rotates, the second spur gear 507 moves along the inner ring of the gear ring 508, thereby driving the reciprocating screw 505 to rotate, and then driving the lifting threaded sleeve 506 and the first magnet 509 to move up and down, and then driving the second magnet 510 to move up and down through the magnetic attraction force, and then driving the scraper 511 to move up and down. This driving method can ensure the closedness of the vertical drive box 503 and prevent the material in the reactor from entering the vertical drive box 503.

[0062] Example 5

[0063] Reference Figure 1-20 The difference between this embodiment and embodiment 1 is that a cleaning mechanism is installed inside the methanol recovery tank 3. The cleaning mechanism includes a horizontal rotating shaft 301. The horizontal rotating shaft 301 is driven to rotate by a second rotating motor 302. A plurality of cleaning brushes 303 are installed outside the second rotating motor 302. The cleaning brushes 303 are provided with bristles 3031 on a side away from the horizontal rotating shaft 301. A spacing adjustment mechanism is provided between the cleaning brushes 303 and the horizontal rotating shaft 301.

[0064] When the second rotating motor 302 is turned on, it can drive the horizontal shaft 301 to rotate, and then drive the cleaning brush 303 to rotate accordingly, so that the inner wall of the methanol recovery tank 3 is cleaned by the bristles 3031, thereby improving the cleaning efficiency. Since the distance between the cleaning brush 303 and the horizontal shaft 301 is adjustable, after the bristles 3031 have been used for a period of time and are worn, the brushing effect will be reduced. At this time, the distance between the cleaning brush 303 and the horizontal shaft 301 is adjusted so that the bristles 3031 are closer to the inner wall of the methanol recovery tank 3, so that normal brushing can be performed, which can reduce the frequency of replacing the cleaning brush 303 and reduce maintenance costs.

[0065] The spacing adjustment mechanism includes fixed support plates 304 symmetrically arranged at both ends of the horizontal rotating shaft 301. A gear plate 306 is provided on each side of the two fixed support plates 304 close to each other. The gear plates 306 are rotatably mounted on the outside of the horizontal rotating shaft 301. A plurality of connecting frames 3051 are slidably mounted on the side of the fixed support plates 304 close to the gear plates 306 via slide rails 305. Limiting rods 3053 are fixed to the connecting frames 3051. A plurality of arcuate limiting slots 3061 are formed on the gear plates 306. The limiting rods 3053 pass through the arcuate limiting slots 3061 and extend through the gear plates 306.

[0066] When the gear plate 306 rotates relative to the horizontal rotating shaft 301, since the limiting rod 3053 is located in the arc-shaped limiting groove 3061, it can drive the connecting frame 3051 to slide in the slide rail 305, and then the position of the connecting frame 3051 can be adjusted. A connecting bar 3052 is fixed between a pair of connecting frames 3051, and the cleaning brush 303 is fixed to the connecting bar 3052. By adjusting the position of the connecting frame 3051, the distance between the cleaning brush 303 and the horizontal rotating shaft 301 can be adjusted. The adjustment efficiency is high, and multiple cleaning brushes 303 can be adjusted synchronously.

[0067] Among them, a third spur gear 3071 is rotatably mounted on the fixed support plate 304, the third spur gear 3071 is meshed with the gear plate 306, and a synchronization shaft 307 is connected between the two third spur gears 3071;

[0068] When the synchronization shaft 307 rotates, it can drive the two third spur gears 3071 to rotate synchronously, and then drive the two gear plates 306 to rotate synchronously, so that the cleaning brush 303 can be driven from both ends of the horizontal rotating shaft 301 to synchronously approach and move away from the horizontal rotating shaft 301, and the drive is more stable, which can ensure the parallel state between the cleaning brush 303 and the inner wall of the methanol recovery tank 3.

[0069] A multi-deformable sleeve 3072 is fixed to one end of the synchronization shaft 307, and an adjustment shaft 3073 is movably mounted on the methanol recovery tank 3. A corresponding polygonal pin 3075 is fixed to the end of the adjustment shaft 3073 close to the multi-deformable sleeve 3072, and an end of the adjustment shaft 3073 away from the polygonal pin 3075 extends to the outside of the methanol recovery tank 3 and is fixed to a handwheel 3074.

[0070] When it is necessary to adjust the distance between the cleaning brush 303 and the horizontal rotating shaft 301, it is only necessary to stop the multi-deformable sleeve 3072 at the position aligned with the polygonal pin 3075, and adjust the rotating shaft 3073 to move through the side wall of the methanol recovery tank 3, so that it can move and rotate horizontally. A mechanical seal is provided on the outside of the adjusting rotating shaft 3073. At this time, hold the handwheel 3074 and push the polygonal pin 3075 into the multi-deformable sleeve 3072. Then turn the handwheel 3074 to drive the synchronous shaft 307 to rotate, so that the distance between the cleaning brush 303 and the horizontal rotating shaft 301 can be easily adjusted.

[0071] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0072] In this utility model, unless otherwise expressly specified or limited, terms such as "disposed," "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to mechanical connection, direct connection, or indirect connection through an intermediate medium; they may refer to internal communication between two elements or interaction between two elements. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0073] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by technicians in this field. The provision of power is also common knowledge in this field. In addition, the present invention is mainly used to protect mechanical devices, so the control method and circuit connection are no longer explained in detail in the present invention.

[0074] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A methanol recovery tank for methylparaben production, characterized in that: The invention comprises a methanol recovery tank (3), wherein a cleaning mechanism is installed inside the methanol recovery tank (3), wherein the cleaning mechanism comprises a horizontal rotating shaft (301), wherein the horizontal rotating shaft (301) is driven to rotate by a second rotating motor (302), wherein a plurality of cleaning brushes (303) are installed outside the second rotating motor (302), wherein bristles (3031) are provided on a side of the cleaning brush (303) away from the horizontal rotating shaft (301), and a spacing adjustment mechanism is provided between the cleaning brush (303) and the horizontal rotating shaft (301).

2. A methanol recovery tank for methylparaben production according to claim 1, characterized in that: The spacing adjustment mechanism comprises fixed support plates (304) symmetrically arranged at both ends of the horizontal rotating shaft (301); a gear plate (306) is provided on the side of the two fixed support plates (304) close to each other; the gear plate (306) is rotatably mounted on the outside of the horizontal rotating shaft (301); a plurality of connecting frames (3051) are slidably mounted on the side of the fixed support plates (304) close to the gear plate (306) through a slide rail (305); a limiting rod (3053) is fixed on the connecting frame (3051); a plurality of arc-shaped limiting slots (3061) are provided on the gear plate (306); and the limiting rod (3053) passes through the gear plate (306) through the arc-shaped limiting slots (3061).

3. A methanol recovery tank for methylparaben production according to claim 2, characterized in that: A connecting bar (3052) is fixed between the pair of connecting frames (3051), and the cleaning brush (303) is fixed to the connecting bar (3052).

4. A methanol recovery tank for methylparaben production according to claim 3, characterized in that: A third spur gear (3071) is rotatably mounted on the fixed support plate (304), the third spur gear (3071) is meshed with the gear plate (306), and a synchronization shaft (307) is connected between the two third spur gears (3071).

5. A methanol recovery tank for methylparaben production according to claim 4, characterized in that: A multi-deformable sleeve (3072) is fixed to one end of the synchronization shaft (307), an adjustment shaft (3073) is movably mounted on the methanol recovery tank (3), and a polygonal latch (3075) corresponding to the adjustment shaft (3073) is fixed to one end close to the multi-deformable sleeve (3072).

6. A methanol recovery tank for methylparaben production according to claim 5, characterized in that: One end of the adjusting shaft (3073) away from the polygonal latch (3075) extends to the outside of the methanol recovery tank (3) and is fixed with a hand wheel (3074).

7. A methanol recovery tank for methylparaben production according to claim 6, characterized in that: The adjusting shaft (3073) is movable and penetrates the side wall of the methanol recovery tank (3), can move horizontally and rotate, and a mechanical seal is provided on the outside of the adjusting shaft (3073).

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