Efficient mixing esterification kettle for producing methylparaben

Abstract

The utility model discloses an efficient mixing esterification kettle for methylparaben production, which comprises an esterification kettle, a jacket is mounted outside the esterification kettle, a vertical rotating shaft is rotatably mounted at the top end of the esterification kettle, the bottom end of the vertical rotating shaft extends into the esterification kettle, a buffer container is fixed outside the vertical rotating shaft, and a stirrer is fixed at the bottom end of the vertical rotating shaft. The vertical rotating shaft is hollow and is communicated with the buffer container, the top end of the vertical rotating shaft is connected with the methanol introduction pipe through a rotating joint, and the bottom end of the buffer container is connected with a liquid distributor. The liquid distributor comprises the distribution pipe and the liquid spraying pipe, and the horizontal movable rod with the reset spring and the sealing plug are arranged in the distribution pipe, so that intermittent spraying of methanol can be realized; the pressurizing piston and the elastic telescopic rod in the buffer container can pressurize methanol, so that the mixing effect can be improved, and the production efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydroxybenzyl production technical field especially relates to a kind of high-efficiency mixing material esterification kettle for hydroxybenzyl production. BACKGROUND

[0002] Hydroxybenzyl is an important chemical product, and is widely used in cosmetics, food, medicine and other fields. Its traditional production process is mainly under the catalysis of sulfuric acid, by p-hydroxybenzoic acid and methanol esterification reaction to generate hydroxybenzyl, and then through a series of complex processes such as dealcoholization, neutralization, water separation, centrifugal filtration, dissolution and decolorization, filtration and distillation desolventization, crystallization and centrifugation, double-cone drying, etc. to obtain finished product.

[0003] The reaction equation is as follows:

[0004]

[0005] In the existing hydroxybenzyl production process, especially in the key link of esterification reaction, there are some problems to be solved. In the traditional esterification reactor, the mixing effect of methanol and p-hydroxybenzoic acid is often not ideal, which will limit the reaction rate and affect the production efficiency. Due to uneven mixing, the local reactant concentration may be too high or too low, which not only prolongs the reaction time, but also may cause side reactions, reducing product quality and yield. INVENTION CONTENTS

[0006] In order to solve the problems mentioned in the background, the utility model provides a kind of high-efficiency mixing material esterification kettle for hydroxybenzyl production.

[0007] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0008] A kind of high-efficiency mixing material esterification kettle for hydroxybenzyl production, including esterification kettle, the outside of esterification kettle is equipped with jacket, the top of esterification kettle is rotatably installed with vertical rotating shaft, the bottom of vertical rotating shaft extends to the inside of esterification kettle and is fixed with buffer container outside, the bottom of vertical rotating shaft is fixed with stirrer, vertical rotating shaft is hollow and is communicated with buffer container, the top of vertical rotating shaft is connected with methanol introduction pipe by rotary joint, the bottom of buffer container is connected with liquid distributor;

[0009] The liquid distributor includes a plurality of distribution pipes, and a plurality of liquid injection pipes are connected to the distribution pipes. The liquid injection pipes are horizontally arranged, and the plurality of liquid injection pipes are equally distributed in the vertical direction.

[0010] Preferably, the top of the esterification kettle is fixed with a first rotary motor, the output shaft of the first rotary motor is fixed with a first bevel gear, the outside of the vertical rotating shaft is fixed with a second bevel gear, and the first bevel gear and the second bevel gear are meshed with each other.

[0011] Preferably, a horizontal movable rod is arranged at a position corresponding to the liquid spray pipe in the distribution pipe, a reset spring is arranged outside the horizontal movable rod, and a blocking plug corresponding to the liquid spray pipe is fixed to one end of the horizontal movable rod.

[0012] Preferably, the other end of the horizontal movable rod extends to the outside of the distribution pipe, and a plurality of horizontal movable rods are fixed with the first vertical strip, and a second vertical strip is connected to the outer wall of the distribution pipe through a telescopic guide rod.

[0013] Preferably, the first vertical strip and the second vertical strip are fixed with a gear rack on the side close to each other, a first straight gear is arranged between the two gear racks, and the two gear racks are engaged with the first straight gear.

[0014] Preferably, the second vertical strip is fixed with a trigger on the side away from the distribution pipe, the trigger is in a circular ring structure, a guide ring is fixed to the inner wall of the esterification kettle, and a plurality of arc protrusions are equidistantly arranged on the guide ring.

[0015] Preferably, a pressurizing piston is arranged in the buffer container, an elastic telescopic rod is arranged between the pressurizing piston and the top end inner wall of the pressurizing piston, the elastic telescopic rod is used for energy storage, and the communication opening between the vertical rotating shaft and the buffer container is located below the pressurizing piston.

[0016] Compared with the prior art, the esterification kettle has the following beneficial effects:

[0017] 1. The methanol is dispersed and sprayed out through the liquid distributor, the liquid spray pipes on the distribution pipe are horizontally arranged and equidistantly distributed in the vertical direction, the buffer container and the distribution pipe are driven to move along with the rotation of the vertical rotating shaft, the mixing effect is further improved, the methanol and the hydroxybenzoic acid are better mixed, and the esterification reaction is accelerated.

[0018] 2. The horizontal movable rod, the reset spring, the blocking plug and other structures at the position corresponding to the liquid spray pipe in the distribution pipe cooperate with the trigger, the guide ring and the arc protrusions, so that the liquid spray pipe can be intermittently opened, the methanol spraying pressure is improved, and the mixing effect is further improved.

[0019] 3. The pressurizing piston and the elastic telescopic rod in the buffer container store energy when the liquid spray pipe is blocked, and pressurize the methanol when the spray pipe is opened, so as to improve the methanol spraying pressure, and help to improve the mixing effect and the reaction efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0021] Figure 1 The flow chart of the present application;

[0022] Figure 2 The three-dimensional view of the esterification kettle of the present application;

[0023] Figure 3 The Figure 2 The enlarged detail view of position A;

[0024] Figure 4 The front view of the esterification kettle of the present application;

[0025] Figure 5 The three-dimensional view of the esterification kettle of the present application;

[0026] Figure 6 The enlarged detail view of the liquid distributor of the present application;

[0027] Figure 7 The Figure 6 The enlarged detail view of position B;

[0028] Figure 8 The internal structure schematic view of the esterification kettle of the present application;

[0029] Figure 9 The cross-sectional view of the buffer container of the present application;

[0030] Figure 10 The Figure 9 The enlarged detail view of position C;

[0031] Figure 11 The first view cross-sectional view of the vertical drive box of the present application;

[0032] Figure 12 The Figure 11 The enlarged detail view of position D;

[0033] Figure 13 The second view cross-sectional view of the vertical drive box of the present application;

[0034] Figure 14 The Figure 13 The enlarged detail view of position E;

[0035] Figure 15The utility model discloses a methanol recovery tank first visual angle section view,

[0036] Figure 16 The utility model discloses a methanol recovery tank second visual angle section view,

[0037] Figure 17 For Figure 16 Middle F position enlargies detail view,

[0038] Figure 18 For the utility model discloses a horizontal pivot enlargies detail view,

[0039] Figure 19 For the utility model discloses a gear disc position enlargies detail view,

[0040] Figure 20 For the utility model discloses a fixed support disc position enlargies detail view,

[0041] In the drawing: 1, esterification kettle;101, jacket;2, condenser;3, methanol recovery tank;301, horizontal pivot;302, second rotary motor;303, cleaning brush;3031, brush hair;304, fixed support disc;305, slide rail;3051, connecting frame;3052, connecting strip;3053, limit rod;306, gear disc;3061, arc limit through slot;307, synchronous shaft;3071, third spur gear;3072, polygon sleeve;3073, adjusting pivot;3074, hand wheel;3075, polygon bolt;4, vertical pivot;401, rotary joint;402, methanol introduction pipe;403, stirrer;5, buffer container;501, pressurizing piston;502, elastic telescopic rod;503, vertical drive box;504, cleaning doctor;505, reciprocating screw rod;506, lifting screw sleeve;507, second spur gear;508, gear ring;509, first magnet;510, second magnet;511, blade;6, liquid distributor;601, distribution pipe;602, liquid injection pipe;603, horizontal movable rod;604, plugging plug;605, return spring;606, first vertical strip;607, telescopic guide rod;608, second vertical strip;609, trigger;610, guide ring;611, arc convex;612, rack;613, first spur gear;7, centrifugal filtration drying device;8, rectifying column. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0043] Embodiment 1

[0044] With reference to Figures 1-20 The utility model relates to a kind of high-efficiency mixing esterification kettle for hydroxybenzoate production, including esterification kettle 1, condenser 2 and methanol recovery tank 3, the outside of esterification kettle 1 is equipped with jacket 101, the top of esterification kettle 1 is rotatably installed with vertical rotating shaft 4, vertical rotating shaft 4 bottom extends to the inside of esterification kettle 1 and is externally fixed with buffer container 5, vertical rotating shaft 4 bottom is fixed with stirrer 403, vertical rotating shaft 4 is hollow and is communicated with buffer container 5, vertical rotating shaft 4 top is connected with methanol introduction pipe 402 by swivel joint 401, buffer container 5 bottom is connected with liquid distributor 6;

[0045] Esterification kettle 1 is inhaled by vacuum proper amount solid p-hydroxybenzoic acid, then methanol is introduced by methanol introduction pipe 402, mixing is promoted during the process of introducing methanol, methanol and p-hydroxybenzoic acid are accelerated, esterification reaction is accelerated, after reaction, material is centrifuged and filtered by centrifugal filter drying device 7, wet material is dried, filter mother liquor is added to carry out rectification by rectification column 8, after rectification, condense and recover to methanol recovery tank 3 by condenser 2 and use in the set;

[0046] The dispersion of methanol is improved by liquid distributor 6, and the mixing effect is improved.

[0047] Wherein, the top of esterification kettle 1 is fixed with first rotating motor 405, the output shaft of first rotating motor 405 is fixed with first bevel gear 406, the outside of vertical rotating shaft 4 is fixed with second bevel gear 404, first bevel gear 406 and second bevel gear 404 are engaged with each other;

[0048] By opening first rotating motor 405, first rotating motor 405 drives first bevel gear 406 to rotate, first bevel gear 406 and second bevel gear 404 are engaged, so as to drive vertical rotating shaft 4 to rotate, so as to drive stirrer 403 to stir.

[0049] Embodiment 2

[0050] With reference to Figures 1-20The 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;

[0051] 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.

[0052] Example 3

[0053] Reference Figures 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;

[0054] The return spring 605 pushes the sealing plug 604 to block the liquid nozzle 602 in the state without receiving external force.

[0055] 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;

[0056] 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.

[0057] The buffer container 5 is internally provided with a pressurizing piston 501, and an elastic telescopic rod 502 is arranged between the pressurizing piston 501 and the inner wall of the top end of the pressurizing piston 501, and the elastic telescopic rod 502 is used for energy storage, and the communication opening between the vertical rotating shaft 4 and the buffer container 5 is located below the pressurizing piston 501;

[0058] Methanol is continuously delivered into the buffer container 5, when the liquid jet pipe 602 is in the closed state, the hydraulic pressure rises, at this time, the pressurizing piston 501 is pushed upward, the elastic telescopic rod 502 is compressed and stored, when the liquid jet pipe 602 is opened, the elastic telescopic rod 502 pushes the pressurizing piston 501 to move downward to pressurize the methanol, and the pressure of the methanol when sprayed is increased.

[0059] Embodiment 4

[0060] Reference Figures 1-20 The difference between the embodiment and the embodiment 1 is that one side of the buffer container 5 is fixed with a vertical driving box 503, the side of the vertical driving box 503 away from the buffer container 5 is fixed with a cleaning scraper 504, the output end of the vertical driving box 503 is connected with a scraping piece 511, the scraping piece 511 is in contact with the surface of the cleaning scraper 504, and the cleaning scraper 504 is in contact with the inner wall of the esterification kettle 1;

[0061] When the buffer container 5 rotates, the vertical driving box 503 and the cleaning scraper 504 are driven to rotate, and then the cleaning scraper 504 is driven to clean the inner wall of the esterification kettle 1, so that the crystalline substances can be scraped off, and the materials remaining on the inner wall of the esterification kettle 1 can be prevented from being unable to be discharged, and the scraping piece 511 is driven by the vertical driving box 503 to move vertically along the surface of the cleaning scraper 504, so that the surface of the cleaning scraper 504 can be cleaned.

[0062] The inside of the vertical driving box 503 is internally provided with a reciprocating screw rod 505, the outside of the reciprocating screw rod 505 is externally provided with a lifting threaded sleeve 506, the lifting threaded sleeve 506 is fixed with a first magnet 509, the outside of the vertical driving box 503 is externally provided with a second magnet 510, the first magnet 509 and the second magnet 510 are attracted to each other through the side wall of the vertical driving box 503, and the scraping piece 511 is fixed on the second magnet 510, the top end of the reciprocating screw rod 505 is fixed with a second spur gear 507, the inside of the esterification kettle 1 is internally provided with a tooth ring 508, and the second spur gear 507 is engaged with the tooth ring 508;

[0063] When the buffer container 5 rotates, the second spur gear 507 moves along the inner ring of the tooth ring 508, so as to drive the reciprocating screw rod 505 to rotate, and then drive the lifting threaded sleeve 506 and the first magnet 509 to move up and down, and then drive the second magnet 510 to move up and down through the magnetic attraction force, and then drive the scraping piece 511 to move up and down, and this driving mode can ensure the sealing property of the vertical driving box 503, and prevent the materials in the reaction kettle from entering the inside of the vertical driving box 503.

[0064] Embodiment 5

[0065] With reference to Figures 1-20 The difference between the embodiment and embodiment 1 is that a cleaning mechanism is arranged in 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 arranged outside the second rotating motor 302, the cleaning brushes 303 are provided with bristles 3031 on the side away from the horizontal rotating shaft 301, and a spacing adjusting mechanism is arranged between the cleaning brushes 303 and the horizontal rotating shaft 301.

[0066] When the second rotating motor 302 is started, the horizontal rotating shaft 301 is driven to rotate, and then the cleaning brushes 303 are driven to rotate, so that the bristles 3031 clean the inner wall of the methanol recovery tank 3, and the cleaning efficiency is improved. Since the spacing between the cleaning brushes 303 and the horizontal rotating shaft 301 is adjustable, after the bristles 3031 are used for a period of time and are worn, the cleaning effect will be reduced. At this time, the spacing between the cleaning brushes 303 and the horizontal rotating shaft 301 is adjusted, so that the bristles 3031 are closer to the inner wall of the methanol recovery tank 3, so that normal cleaning can be performed, the frequency of replacing the cleaning brushes 303 can be reduced, and the maintenance cost is reduced.

[0067] The spacing adjusting mechanism comprises fixed support discs 304 symmetrically arranged at both ends of the horizontal rotating shaft 301, gear plates 306 are arranged on the sides of the two fixed support discs 304 away from each other, the gear plates 306 are rotatably arranged outside the horizontal rotating shaft 301, a plurality of connecting frames 3051 are slidably arranged on the sides of the fixed support discs 304 close to the gear plates 306 through sliding rails 305, limiting rods 3053 are fixed on the connecting frames 3051, and a plurality of arc-shaped limiting through grooves 3061 are formed in the gear plates 306.

[0068] When the gear plates 306 rotate relative to the horizontal rotating shaft 301, since the limiting rods 3053 are located in the arc-shaped limiting through grooves 3061, the connecting frames 3051 can be driven to slide in the sliding rails 305, and then the positions of the connecting frames 3051 can be adjusted. A connecting strip 3052 is fixed between a pair of connecting frames 3051, the cleaning brushes 303 are fixed with the connecting strip 3052, the spacing between the cleaning brushes 303 and the horizontal rotating shaft 301 can be adjusted by adjusting the positions of the connecting frames 3051, the adjustment efficiency is high, and a plurality of cleaning brushes 303 can be adjusted synchronously.

[0069] The third straight gears 3071 are rotatably arranged on the fixed support discs 304, the third straight gears 3071 are engaged with the gear plates 306, and a synchronous shaft 307 is connected between the two third straight gears 3071.

[0070] When the synchronous shaft 307 rotates, the two third spur gears 3071 can be driven to rotate synchronously, and the two gear plates 306 are driven to rotate synchronously, so that the cleaning brush 303 can be driven to move close to and away 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.

[0071] The one end of the synchronous shaft 307 is fixed with a multi-deformation sleeve 3072, the methanol recovery tank 3 is movably provided with an adjusting rotating shaft 3073, the one end of the adjusting rotating shaft 3073 close to the multi-deformation sleeve 3072 is fixed with a corresponding polygonal plug 3075, and the one end of the adjusting rotating shaft 3073 away from the polygonal plug 3075 extends to the outside of the methanol recovery tank 3 and is fixed with a hand wheel 3074.

[0072] When it is necessary to adjust the distance between the cleaning brush 303 and the horizontal rotating shaft 301, the multi-deformation sleeve 3072 is only needed to be stopped at a position aligned with the polygonal plug 3075, the adjusting rotating shaft 3073 movably penetrates the side wall of the methanol recovery tank 3 and can be horizontally moved and rotated, and the adjusting rotating shaft 3073 is externally provided with a mechanical seal, at this time, the polygonal plug 3075 is pushed into the multi-deformation sleeve 3072 by holding the hand wheel 3074, and then the hand wheel 3074 is rotated 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 conveniently adjusted.

[0073] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0074] In the present application, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or can be integrated; can be mechanically connected, can be directly connected, or indirectly connected through an intermediate medium, can be the communication between two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0075] The control mode of the utility model is automatically controlled through the controller, the control circuit of the controller can be realized through simple programming of the person skilled in the art, the provision of the power supply also belongs to the common knowledge in the art, and the utility model is mainly used for protecting the mechanical device, so the control mode and the circuit connection of the utility model are not explained in detail.

[0076] The above is only the preferred specific implementation mode of the utility model, but the protection scope of the utility model is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A high-efficiency mixing esterification kettle for the production of methylparaben, comprising an esterification kettle (1), characterized in that: The esterification kettle (1) is provided with a jacket (101) on the outside, a vertical rotating shaft (4) is rotatably provided on the top of the esterification kettle (1), the bottom 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 on the bottom of the vertical rotating shaft (4), the interior of the vertical rotating shaft (4) is hollow and communicates with the buffer container (5), the top of the vertical rotating shaft (4) is connected to a methanol introduction pipe (402) via a rotary joint (401), and the bottom of the buffer container (5) is connected to a liquid distributor (6); The liquid distributor (6) comprises a plurality of distribution pipes (601), a plurality of liquid nozzles (602) are connected to the distribution pipes (601), the liquid nozzles (602) are arranged horizontally, and the plurality of liquid nozzles (602) are distributed equidistantly in the vertical direction.

2. A high-efficiency mixing esterification kettle for the production of methylparaben according to claim 1, characterized in that: A first rotating motor (405) is fixed to the top of the esterification kettle (1), a first bevel gear (406) is fixed to the output shaft of the first rotating motor (405), a second bevel gear (404) is fixed to the outside of the vertical rotating shaft (4), and the first bevel gear (406) and the second bevel gear (404) are meshed with each other.

3. A high-efficiency mixing esterification kettle for the production of methylparaben according to claim 1, characterized in 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 to one end of the horizontal movable rod (603).

4. A high-efficiency mixing esterification kettle for the production of methylparaben according to claim 3, characterized in that: 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).

5. A high-efficiency mixed esterification kettle for the production of methylparaben according to claim 4, characterized in that: A rack (612) is fixed on one side of the first vertical bar (606) and the second vertical bar (608) close to each other, a first straight gear (613) is provided between the two racks (612), and both racks (612) are meshed with the first straight gear (613).

6. A high-efficiency mixed esterification kettle for the production of methylparaben according to claim 5, characterized in that: A trigger member (609) is fixed on the side of the second vertical bar (608) away from the distribution pipe (601), and the trigger member (609) is a circular ring structure. A guide ring (610) is fixed on the inner wall of the esterification kettle (1), and a plurality of arc-shaped protrusions (611) are evenly distributed on the guide ring (610).

7. A high-efficiency mixed esterification kettle for the production of methylparaben according to claim 6, characterized in that: A pressurizing piston (501) is installed in the buffer container (5), and 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 for storing energy. The communication opening between the vertical rotating shaft (4) and the buffer container (5) is located below the pressurizing piston (501).

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