CN223371836U

CN223371836U - A methanol recovery tank for methylparaben production

Info

Publication number: CN223371836U
Application number: CN202422971697.9U
Authority: CN
Inventors: 杨心珉; 毛友刚; 华健
Original assignee: Suzhou Hengchang Biotechnology Co ltd
Current assignee: Suzhou Hengchang Biotechnology Co ltd
Priority date: 2024-12-03
Filing date: 2024-12-03
Publication date: 2025-09-23
Anticipated expiration: 2034-12-03

Abstract

The utility model discloses a methanol recovery tank for methyl hydroxybenzoate production, which comprises a methanol recovery tank, wherein a cleaning mechanism is arranged in the methanol recovery tank, the cleaning mechanism comprises a horizontal rotating shaft, the horizontal rotating shaft is driven to rotate by a second rotating motor, a plurality of cleaning brushes are arranged outside the second rotating motor, bristles are arranged on one side of the cleaning brushes, which is far away from the horizontal rotating shaft, of the cleaning brushes, a spacing adjusting mechanism is arranged between the cleaning brushes and the horizontal rotating shaft, the spacing adjusting mechanism comprises fixed supporting plates symmetrically arranged at two ends of the horizontal rotating shaft, gear plates are arranged on one sides, which are close to each other, of the two fixed supporting plates, and the gear plates are rotatably arranged outside the horizontal rotating shaft. According to the cleaning mechanism in the methanol recovery tank, the interval adjusting mechanism is arranged between the cleaning brush and the horizontal rotating shaft, and the interval between the cleaning brush and the horizontal rotating shaft can be adjusted according to the abrasion condition of the brush hair, so that the brush hair can continuously and effectively brush the inner wall of the methanol recovery tank, and the replacement frequency of the cleaning brush is reduced.

Description

Methyl alcohol recovery tank is used in production of methyl hydroxybenzoate

Technical Field

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

Background

As an important chemical product, the methylparaben has wide application in various fields such as cosmetics, foods, medicines and the like. The traditional production process mainly comprises the steps of generating methyl hydroxybenzoate through esterification reaction of p-hydroxybenzoic acid and methanol under the catalysis of sulfuric acid, and obtaining a finished product through a series of complex procedures of dealcoholization, neutralization, water separation, centrifugal filtration, dissolution and decoloration, filtration, distillation and desolventization, crystallization and centrifugation, biconical drying and the like.

The reaction equation is as follows:

In the existing production process of methylparaben, in the methanol recovery link, a device for cleaning a methanol recovery tank is often not perfect enough. The brush hair is worn after the cleaning brush is used for a long time, and the cleaning effect is reduced due to the fact that the distance between the cleaning brush and the tank wall cannot be conveniently adjusted, the cleaning brush needs to be frequently replaced, the production cost and the maintenance workload are increased, and the economical efficiency and the sustainability of the whole production process are reduced.

Disclosure of utility model

In order to solve the problems mentioned in the background art, the utility model provides a methanol recovery tank for producing methylparaben.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

The utility model provides a methyl alcohol recovery tank is used in methyl hydroxybenzoate production, includes the methyl alcohol recovery tank, the internally mounted of methyl alcohol recovery tank has cleaning mechanism, cleaning mechanism includes horizontal pivot, and horizontal pivot passes through second rotating electrical machines drive rotation, and the externally mounted of second rotating electrical machines has a plurality of cleaning brushes, and one side that the cleaning brush kept away from horizontal pivot is equipped with the brush hair, is equipped with interval adjustment mechanism between cleaning brush and the horizontal pivot.

Preferably, the interval adjustment mechanism comprises fixed support plates symmetrically arranged at two ends of the horizontal rotating shaft, one sides of the two fixed support plates, which are close to each other, are respectively provided with a gear plate, the gear plates are rotatably arranged outside the horizontal rotating shaft, one sides of the fixed support plates, which are close to the gear plates, are provided with a plurality of connecting frames through sliding rails in a sliding manner, limiting rods are fixed on the connecting frames, a plurality of arc limiting through grooves are formed in the gear plates, and the limiting rods penetrate through the gear plates through the arc limiting through grooves.

Preferably, a connecting strip is fixed between the pair of connecting frames, and the cleaning brush is fixed with the connecting strip.

Preferably, the fixed support disc is rotatably provided with a third spur gear, the third spur gear is meshed with the gear disc, and a synchronizing shaft is connected between the two third spur gears.

Preferably, one end of the synchronizing shaft is fixed with a variable-shape sleeve, the methanol recovery tank is movably provided with an adjusting rotating shaft, and one end of the adjusting rotating shaft, which is close to the variable-shape sleeve, is fixed with a polygonal bolt corresponding to the adjusting rotating shaft.

Preferably, one end of the adjusting rotating shaft far away from the polygonal bolt extends to the outside of the methanol recovery tank and is fixedly provided with a hand wheel.

Preferably, the adjusting rotating shaft movably penetrates through the side wall of the methanol recovery tank, can horizontally move and rotate, and a mechanical seal is arranged outside the adjusting rotating shaft.

Compared with the prior art, the utility model has the beneficial effects that:

1. The cleaning mechanism in the methanol recovery tank is provided with a spacing adjusting mechanism between the cleaning brush and the horizontal rotating shaft, and the spacing between the cleaning brush and the horizontal rotating shaft can be adjusted according to the abrasion condition of the brush hair, so that the brush hair can continuously and effectively brush the inner wall of the methanol recovery tank, and the replacement frequency of the cleaning brush is reduced;

2. The interval adjusting mechanism is matched with a third straight gear and a synchronous shaft through parts such as a fixed supporting disc, a gear disc, a connecting frame and a limiting rod, the positions of the cleaning brushes can be synchronously and stably adjusted from two ends of the horizontal rotating shaft, the parallel state of the cleaning brushes and the inner wall of the methanol recovery tank is ensured, and the interval adjustment is conveniently carried out through a hand wheel, an adjusting rotating shaft, a polygonal sleeve and a polygonal plug pin.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a flow chart of the present utility model;

FIG. 2 is a perspective view of an esterification kettle in accordance with the present utility model;

FIG. 3 is an enlarged detail view of the position A of FIG. 2;

FIG. 4 is a front view cross-section of the esterification kettle of the present utility model;

FIG. 5 is a perspective cross-sectional view of an esterification kettle in accordance with the present utility model;

FIG. 6 is an enlarged detail view of the liquid distributor of the present utility model;

FIG. 7 is an enlarged detail view of the position B of FIG. 6;

FIG. 8 is a schematic diagram of the internal structure of the esterification reactor of the present utility model;

FIG. 9 is a cross-sectional view of a buffer container of the present utility model;

FIG. 10 is an enlarged detail view of the position C of FIG. 9;

FIG. 11 is a first view cross section of the vertical drive housing of the present utility model;

FIG. 12 is an enlarged detail view of the position D of FIG. 11;

FIG. 13 is a second perspective cross-sectional view of the vertical drive housing of the present utility model;

FIG. 14 is an enlarged detail view of the position E of FIG. 13;

FIG. 15 is a first view cross-section of the methanol recovery tank of the present utility model;

FIG. 16 is a second perspective cross-sectional view of the methanol recovery tank of the present utility model;

FIG. 17 is an enlarged detail view of position F of FIG. 16;

FIG. 18 is an enlarged detail view of the horizontal axis of rotation of the present utility model;

FIG. 19 is an enlarged detail view of the gear plate position of the present utility model;

FIG. 20 is an enlarged detail view of the position of the stationary support plate of the present utility model;

In the figure, 1, an esterification kettle; 101, jacket, 2, condenser, 3, methanol recovery tank, 301, horizontal shaft, 302, second rotary motor, 303, cleaning brush, 3031, brush, 304, fixed support disk, 305, slide rail, 3051, connecting frame, 3052, connecting bar, 3053, limit lever, 306, gear disk, 3061, arc limit through groove, 307, synchronous shaft, 3071, third straight gear, 3072, polygonal sleeve, 3073, adjusting shaft, 3074, hand wheel, 3075, polygonal bolt, 4, vertical shaft, 401, rotary joint, 402, methanol introducing pipe, 403, stirrer, 5, buffer container, 501, pressurizing piston, 502, elastic telescopic rod, 503, vertical driving box, 504, cleaning scraper, 505, reciprocating screw, 506, lifting screw sleeve, 507, second straight gear, 508, toothed ring, 509, first magnet, 510, second magnet, 511, doctor blade, 6, liquid distributor, 601, distributing pipe, 602, liquid spray pipe, 603, horizontal movable rod, 604, plug, 607, plug, sealing spring, 606, first reset spring, 611, guide wire, 613, guide wire, 609, arc guide wire, and 8.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Example 1

Referring to fig. 1-20, a methanol recovery tank for production of methylparaben comprises an esterification kettle 1, a condenser 2 and a methanol recovery tank 3, wherein a jacket 101 is arranged outside the esterification kettle 1, a vertical rotating shaft 4 is rotatably arranged at the top end of the esterification kettle 1, a buffer container 5 is fixed outside the esterification kettle 1, a stirrer 403 is fixed at the bottom end of the vertical rotating shaft 4, the inside of the vertical rotating shaft 4 is hollow and communicated with the buffer container 5, the top end of the vertical rotating shaft 4 is connected with a methanol introduction pipe 402 through a rotary joint 401, and a liquid distributor 6 is connected at the bottom end of the buffer container 5;

the esterification kettle 1 is used for sucking a proper amount of solid parahydroxybenzoic acid in vacuum, then methanol is introduced through a methanol introduction pipe 402, stirring is started in the process of introducing the methanol, mixing of the methanol and the parahydroxybenzoic acid is promoted, the esterification reaction is accelerated, after the reaction is completed, materials are centrifugally filtered through a centrifugal filtering and drying device 7, wet materials are dried, filtered mother liquor is added into a rectifying tower 8 for rectification, and the rectified mother liquor is condensed through a condenser 2 and recycled to a methanol recovery tank 3 for reuse;

the dispersity of the methanol is improved through the liquid distributor 6, and the mixing effect is improved.

Wherein, the top end 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 is meshed with the second bevel gear 404;

by starting the first rotating motor 405, the first rotating motor 405 drives the first bevel gear 406 to rotate, and the first bevel gear 406 and the second bevel gear 404 are meshed to drive the vertical rotating shaft 4 to rotate, so that the stirrer 403 can be driven to stir.

Example 2

Referring to fig. 1 to 20, the present embodiment is different from embodiment 1 in that the liquid distributor 6 includes a plurality of distribution pipes 601, a plurality of liquid spouts 602 are connected to the distribution pipes 601, the liquid spouts 602 are horizontally arranged, and the plurality of liquid spouts 602 are equally distributed in the vertical direction;

Methanol firstly enters the buffer container 5, then is dispersed into each distribution pipe 601, and is dispersed and sprayed out through the liquid spray pipe 602, so that the mixing effect is improved, and when the vertical rotating shaft 4 rotates, the buffer container 5 can be driven to rotate, so that the distribution pipes 601 are driven to follow and move, and the mixing effect is further improved.

Example 3

Referring to fig. 1 to 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 spray pipe 602, a return spring 605 is installed outside the horizontal movable rod 603, and a plugging plug 604 corresponding to the liquid spray pipe 602 is fixed at one end of the horizontal movable rod 603;

The return spring 605 pushes the plug 604 to plug the liquid nozzle 602 in a state where no external force is received.

The other end of the horizontal movable rod 603 extends to the outside of the distribution pipe 601, a plurality of horizontal movable rods 603 are fixed with a first vertical bar 606, a second vertical bar 608 is connected to the outer wall of the distribution pipe 601 through a telescopic guide rod 607, racks 612 are fixed to one sides of the first vertical bar 606 and the second vertical bar 608, which are close to each other, a first straight gear 613 is arranged between the two racks 612, the two racks 612 are meshed with the first straight gear 613, a trigger piece 609 is fixed to one side, away from the distribution pipe 601, of the second vertical bar 608, the trigger piece 609 is of a circular ring structure, a guide ring 610 is fixed to the inner wall of the esterification kettle 1, and a plurality of arc-shaped bulges 611 are distributed on the guide ring 610 at equal intervals;

When the buffer container 5 rotates along the vertical rotating shaft 4, the distribution pipe 601 moves along the inner ring of the guide ring 610, the trigger piece 609 moves along the inner ring of the guide ring 610, when the trigger piece 609 moves to the arc-shaped protrusion 611, the second vertical bar 608 is pushed towards the first vertical bar 606, at the moment, as the two racks 612 are meshed with the first straight gear 613, the first vertical bar 606 can be driven to move towards the second vertical bar 608 too, the reset spring 605 is compressed, the blocking plug 604 leaves the liquid spray pipe 602, the liquid spray pipe 602 can be opened intermittently, intermittent spraying of methanol can be achieved, the pressure of the spraying of the methanol can be improved, and the mixing effect is improved.

The buffer container 5 is internally provided with a pressurizing piston 501, an elastic telescopic rod 502 is arranged between the pressurizing piston 501 and the top end inner wall of the pressurizing piston 501, the elastic telescopic rod 502 is used for energy storage, and a communication opening between the vertical rotating shaft 4 and the buffer container 5 is positioned below the pressurizing piston 501;

Methanol is continuously conveyed into the buffer container 5, when the liquid spray pipe 602 is in a blocking state, the hydraulic pressure can rise, the pressurizing piston 501 is pushed upwards at the moment, the elastic telescopic rod 502 is compressed for energy storage, and after the liquid spray pipe 602 is opened, the elastic telescopic rod 502 can push the pressurizing piston 501 to move downwards for pressurizing the methanol, so that the pressure during methanol spraying is improved.

Example 4

Referring to fig. 1 to 20, the present embodiment is different from embodiment 1 in that a vertical driving case 503 is fixed to one side of a buffer container 5, a cleaning blade 504 is fixed to one side of the vertical driving case 503 away from the buffer container 5, a wiper blade 511 is connected to an output end of the vertical driving case 503, the wiper blade 511 is in contact with a surface of the cleaning blade 504, and the cleaning blade 504 is in contact with an inner wall of an esterification reactor 1;

when buffer container 5 rotates, drive vertical drive case 503 and cleaning scraper 504 follow and rotate, and then drive cleaning scraper 504 and scrape the inner wall of esterifying cauldron 1, can strike off the crystallization thing, prevent that the material from remaining unable the discharge on the inner wall of esterifying cauldron 1, drive the vertical removal of surface along cleaning scraper 504 of doctor blade 511 through vertical drive case 503 to can clean the surface of cleaning scraper 504.

Wherein, a reciprocating screw rod 505 is installed inside the vertical driving box 503, a lifting threaded sleeve 506 is installed outside the reciprocating screw rod 505, a first magnet 509 is fixed on the lifting threaded sleeve 506, a second magnet 510 is installed outside the vertical driving box 503, the first magnet 509 and the second magnet 510 are attracted to each other through the side wall of the vertical driving box 503, a scraping blade 511 is fixed on the second magnet 510, a second spur gear 507 is fixed at the top end of the reciprocating screw rod 505, a toothed ring 508 is fixed inside the esterification kettle 1, and the second spur gear 507 is meshed with the toothed ring 508;

When the buffer container 5 rotates, the second spur gear 507 walks along the inner ring of the toothed ring 508, so that the reciprocating screw rod 505 is driven to rotate, the lifting threaded sleeve 506 and the first magnet 509 are driven to lift and move, the second magnet 510 is driven to lift and move by magnetic attraction, and the scraping blade 511 is driven to lift and move, so that the sealing performance of the vertical driving box 503 can be ensured by the driving mode, and materials in the reaction kettle are prevented from entering the vertical driving box 503.

Example 5

Referring to fig. 1 to 20, the present embodiment is different from embodiment 1 in that a cleaning mechanism is installed inside the methanol recovery tank 3, the cleaning mechanism includes a horizontal rotation shaft 301, the horizontal rotation shaft 301 is driven to rotate by a second rotation motor 302, a plurality of cleaning brushes 303 are installed outside the second rotation motor 302, bristles 3031 are provided on one side of the cleaning brushes 303 away from the horizontal rotation shaft 301, and a space adjusting mechanism is provided between the cleaning brushes 303 and the horizontal rotation shaft 301;

The second rotating motor 302 can drive the horizontal rotating shaft 301 to rotate when being started, and then the cleaning brush 303 is driven to rotate along with the rotation, so that the inner wall of the methanol recovery tank 3 is cleaned through the brush hair 3031, the cleaning efficiency is improved, as the distance between the cleaning brush 303 and the horizontal rotating shaft 301 is adjustable, after the brush hair 3031 is worn for a period of time, the cleaning effect can be reduced, and the distance between the cleaning brush 303 and the horizontal rotating shaft 301 is adjusted at the moment, so that the brush hair 3031 is closer to the inner wall of the methanol recovery tank 3, the cleaning brush can be cleaned normally, the replacement frequency of the cleaning brush 303 can be reduced, and the maintenance cost is reduced.

The space adjusting mechanism comprises fixed support plates 304 symmetrically arranged at two ends of the horizontal rotating shaft 301, a gear plate 306 is arranged on one side, close to each other, of each fixed support plate 304, the gear plate 306 is rotatably arranged outside the horizontal rotating shaft 301, a plurality of connecting frames 3051 are slidably arranged on one side, close to the gear plate 306, of each fixed support plate 304 through sliding rails 305, limiting rods 3053 are fixed on the connecting frames 3051, a plurality of arc limiting through grooves 3061 are formed in the gear plate 306, and the limiting rods 3053 penetrate through the gear plate 306 through the arc limiting through grooves 3061;

When the gear plate 306 rotates relative to the horizontal rotating shaft 301, the limiting rod 3053 is located in the arc limiting through groove 3061, so that the connecting frame 3051 can be driven to slide in the sliding rail 305, the position of the connecting frame 3051 can be adjusted, the connecting bars 3052 are fixed between the pair of connecting frames 3051, the cleaning brush 303 is fixed with the connecting bars 3052, the distance between the cleaning brush 303 and the horizontal rotating shaft 301 can be adjusted by adjusting the position of the connecting frames 3051, the adjusting efficiency is high, and the plurality of cleaning brushes 303 can be synchronously adjusted.

The fixed support plate 304 is rotatably provided with a third spur gear 3071, the third spur gear 3071 is meshed with the gear plate 306, and a synchronizing shaft 307 is connected between the two third spur gears 3071;

When the synchronizing shaft 307 rotates, the two third spur gears 3071 can be driven to synchronously rotate, and then the two gear plates 306 are driven to synchronously rotate, so that the cleaning brush 303 can be driven to synchronously approach and separate from the horizontal rotating shaft 301 from the two ends of the horizontal rotating shaft 301, the driving is more stable, and the parallel state between the cleaning brush 303 and the inner wall of the methanol recovery tank 3 can be ensured.

Wherein, a polygonal sleeve 3072 is fixed at one end of the synchronizing shaft 307, an adjusting rotating shaft 3073 is movably mounted on the methanol recovery tank 3, a polygonal plug 3075 corresponding to the adjusting rotating shaft 3073 is fixed at one end of the adjusting rotating shaft 3073 close to the polygonal sleeve 3072, one end of the adjusting rotating shaft 3073 far away from the polygonal plug 3075 extends to the outside of the methanol recovery tank 3, and a hand wheel 3074 is fixed;

When the interval between the cleaning brush 303 and the horizontal rotating shaft 301 needs to be adjusted, the adjusting rotating shaft 3073 movably penetrates through the side wall of the methanol recovery tank 3 and can horizontally move and rotate, mechanical seals are arranged outside the adjusting rotating shaft 3073, at the moment, the hand-held hand wheel 3074 pushes the polygonal inserting pin 3075 into the multi-deformation sleeve 3072, and then the hand wheel 3074 is rotated to drive the synchronous shaft 307 to rotate, so that the interval between the cleaning brush 303 and the horizontal rotating shaft 301 can be conveniently adjusted.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

In the present utility model, unless explicitly stated or limited otherwise, the terms "disposed," "mounted," "connected," "secured" and the like are to be construed broadly, as they are, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, directly connected, indirectly connected through intermediaries, or in communication between two elements or in interaction with each other. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The control mode of the utility model is automatically controlled by the controller, the control circuit of the controller can be realized by simple programming of a person skilled in the art, the supply of power also belongs to common knowledge in the art, and the utility model is mainly used for protecting a mechanical device, so the utility model does not explain the control mode and circuit connection in detail.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.

Claims

1. A methanol recovery tank for methyl paraben production, characterized in that it comprises a methanol recovery tank (3), a cleaning mechanism is installed inside the methanol recovery tank (3), the cleaning mechanism comprises 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), bristles (3031) are provided on the 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 methyl paraben production according to claim 1, characterized in that: the spacing adjustment mechanism includes fixed support plates (304) symmetrically arranged at both ends of a horizontal rotating shaft (301), and the two fixed support plates (304) are provided with a gear plate (306) on one side close to each other, and the gear plate (306) is rotatably mounted on the outside of the horizontal rotating shaft (301), and a plurality of connecting frames (3051) are slidably mounted on one side of the fixed support plate (304) close to the gear plate (306) through a slide rail (305), and a limiting rod (3053) is fixed on the connecting frame (3051), and a plurality of arc-shaped limiting grooves (3061) are opened on the gear plate (306), and the limiting rod (3053) passes through the gear plate (306) through the arc-shaped limiting groove (3061).

3. A methanol recovery tank for methylparaben production according to claim 2, characterized in that a connecting bar (3052) is fixed between a pair of the 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 methyl paraben 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 installed on the methanol recovery tank (3), and a polygonal pin (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) movably 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).