A production and preparation system for methylparaben

Abstract

The invention discloses a production and preparation system of methylparaben, including an esterification kettle, a condenser and a methanol recovery tank, wherein a jacket is installed outside the esterification kettle, a vertical rotating shaft is rotatably installed at the top of the esterification kettle, the bottom end of the vertical rotating shaft extends to the inside of the esterification kettle and a buffer container is fixed outside, an agitator is fixed at the bottom end of the vertical rotating shaft, and the vertical rotating shaft is hollow inside and communicated with the buffer container. In the present invention, the liquid distributor includes a distribution pipe and a liquid spray pipe, and a horizontal movable rod with a reset spring and a sealing plug are provided 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. The vertical drive box, the cleaning scraper and the scraper blade combination in the esterification kettle can clean the kettle wall, which can improve the mixing effect, prevent material residue, reduce maintenance costs, and improve production efficiency and product quality.

Description

Technical Field

[0001] The invention relates to the technical field of methylparaben production, and in particular to a production and preparation system of methylparaben. Background Art

[0002] As an important chemical product, methylparaben is widely used in many fields such as cosmetics, food, and medicine. Its traditional production process mainly involves the esterification reaction of p-hydroxybenzoic acid and methanol under the catalysis of sulfuric acid to produce methylparaben, followed by a series of complex processes such as dealcoholization, neutralization, water precipitation, centrifugal filtration, dissolution and decolorization, filtration and distillation, crystallization and centrifugation, and double cone drying to obtain the finished product.

[0003] The reaction equation is as follows:

[0004]

[0005] In the existing methylparaben production process, especially the key link of esterification, 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 lead to limited reaction rate and thus affect production efficiency. Due to uneven mixing, the local reactant concentration may be too high or too low, which will not only prolong the reaction time, but also may cause the occurrence of side reactions, reducing product quality and yield.

[0006] In addition, the problem of materials easily remaining on the inner wall of the reactor during the reaction is also a prominent problem. As the reaction proceeds, some reactants or reaction products may adhere to the reactor wall. After a long period of accumulation, it will affect the heat transfer efficiency of the reactor and lead to unstable reaction conditions. Moreover, these residual materials are difficult to clean up. If they cannot be effectively removed, they will also pollute the next batch of reactions and affect the stability of product quality.

[0007] For the methanol recovery process involved in the reaction, in the prior art, the devices used to clean the methanol recovery tank are often not perfect. For example, the bristles of the cleaning brush are worn after long-term use. Since the distance between the cleaning brush and the tank wall cannot be easily adjusted, the cleaning effect is reduced, and the cleaning brush needs to be replaced frequently, which increases production costs and maintenance workload, and reduces the economy and sustainability of the entire production process.

[0008] In summary, the existing methylparaben production technology has shortcomings in reaction mixing effect, material residue treatment, and methanol recovery tank cleaning and maintenance. A new production and preparation system is needed to solve these problems in order to improve production efficiency, product quality and reduce production costs. Summary of the invention

[0009] In order to solve the problems mentioned in the above background technology, the present invention provides a production and preparation system of methylparaben.

[0010] In order to achieve the above object, the present invention adopts the following technical solutions:

[0011] A production and preparation system of methyl paraben comprises an esterification kettle, a condenser and a methanol recovery tank, wherein a jacket is installed on the outside of the esterification kettle, a vertical rotating shaft is rotatably installed on the top of the esterification kettle, the bottom end of the vertical rotating shaft extends to the inside of the esterification kettle and a buffer container is fixed on the outside, an agitator is fixed on the bottom end of the vertical rotating shaft, the inside of the vertical rotating shaft is hollow and communicated with the buffer container, the top end of the vertical rotating shaft is connected to a methanol introduction pipe through a rotating joint, and the bottom end of the buffer container is connected to a liquid distributor.

[0012] Preferably, a first rotating motor is fixed to the top of the esterification kettle, a first bevel gear is fixed to the output shaft of the first rotating motor, a second bevel gear is fixed to the outside of the vertical rotating shaft, and the first bevel gear and the second bevel gear are meshed with each other.

[0013] Preferably, the liquid distributor comprises a plurality of distribution pipes, to which a plurality of liquid nozzles are connected, the liquid nozzles are arranged horizontally, and the plurality of liquid nozzles are equidistantly distributed in the vertical direction.

[0014] Preferably, a horizontal movable rod is installed in the distribution pipe at a position corresponding to the liquid nozzle, a return spring is installed outside the horizontal movable rod, and a sealing plug corresponding to the liquid nozzle is fixed at one end of the horizontal movable rod.

[0015] Preferably, the other end of the horizontal movable rod extends to the outside of the distribution pipe and the multiple horizontal movable rods are fixed to the first vertical bar, and the outer wall of the distribution pipe is connected to the second vertical bar through a telescopic guide rod.

[0016] Preferably, racks are fixed on the sides of the first vertical bar and the second vertical bar that are close to each other, a first spur gear is provided between the two racks, and the two racks are meshed with the first spur gear.

[0017] Preferably, a triggering member is fixed on the side of the second vertical bar away from the distribution pipe, and the triggering member is a circular ring structure. A guide ring is fixed on the inner wall of the esterification kettle, and a plurality of arc-shaped protrusions are evenly distributed on the guide ring.

[0018] Preferably, a pressurizing piston is installed in the buffer container, and an elastic telescopic rod is provided between the pressurizing piston and the inner wall of the top end of the pressurizing piston, the elastic telescopic rod is used for storing energy, and the connecting opening between the vertical rotating shaft and the buffer container is located below the pressurizing piston.

[0019] Preferably, a vertical drive box is fixed to one side of the buffer container, a cleaning scraper is fixed to the side of the vertical drive box away from the buffer container, a scraper is connected to the output end of the vertical drive box, the scraper contacts the surface of the cleaning scraper, and the cleaning scraper contacts the inner wall of the esterification kettle.

[0020] Preferably, a reciprocating screw is installed inside the vertical drive box, a lifting threaded sleeve is installed outside the reciprocating screw, a first magnet is fixed on the lifting threaded sleeve, a second magnet is installed outside the vertical drive box, the first magnet and the second magnet attract each other across the side wall of the vertical drive box, and the scraper is fixed on the second magnet, a second spur gear is fixed on the top of the reciprocating screw, a gear ring is fixed inside the esterification kettle, and the second spur gear is meshed with the gear ring.

[0021] Preferably, a cleaning mechanism is installed inside the methanol recovery tank, and the cleaning mechanism includes a horizontal rotating shaft, which is driven to rotate by a second rotating motor. A plurality of cleaning brushes are installed outside the second rotating motor, and bristles are provided on the side of the cleaning brush away from the horizontal rotating shaft. A spacing adjustment mechanism is provided between the cleaning brush and the horizontal rotating shaft.

[0022] Preferably, the spacing adjustment mechanism includes fixed support plates symmetrically arranged at both ends of the horizontal rotating shaft, and gear plates are provided on the sides of the two fixed support plates close to each other. The gear plates are 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 plates close to the gear plates through slide rails. A limiting rod is fixed on the connecting frame, and a plurality of arc-shaped limiting grooves are opened on the gear plates, and the limiting rod passes through the gear plates through the arc-shaped limiting grooves.

[0023] Preferably, a connecting strip is fixed between the pair of connecting frames, and the cleaning brush is fixed to the connecting strip.

[0024] Preferably, a third spur gear is rotatably mounted on the fixed support plate, the third spur gear is meshed with the gear plate, and a synchronization shaft is connected between the two third spur gears.

[0025] Preferably, a polygonal sleeve is fixed to one end of the synchronization shaft, an adjustment shaft is movably mounted on the methanol recovery tank, and a polygonal pin corresponding to the adjustment shaft is fixed to one end of the adjustment shaft close to the polygonal sleeve.

[0026] Preferably, one end of the adjusting shaft away from the polygonal latch extends to the outside of the methanol recovery tank and is fixed with a hand wheel.

[0027] Preferably, the adjusting shaft movably penetrates 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.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. Methanol is dispersed and sprayed out through a liquid distributor, and the liquid nozzles on the distribution pipe are arranged horizontally and equidistantly in the vertical direction. At the same time, the buffer container and the distribution pipe are driven to move as the vertical shaft rotates, thereby further improving the mixing effect, promoting better mixing of methanol and hydroxybenzoic acid, and accelerating the esterification reaction;

[0030] 2. The horizontal movable rod, return spring, sealing plug and other structures at the corresponding position of the liquid nozzle in the distribution pipe, together with the trigger, guide ring and arc-shaped protrusion, enable the liquid nozzle to be opened intermittently, increase the methanol spraying pressure, and further improve the mixing effect;

[0031] 3. The pressurized piston and elastic telescopic rod in the buffer container store energy when the liquid nozzle is blocked. When the nozzle is opened, the methanol is pressurized to increase the methanol spraying pressure, which helps to improve the mixing effect and reaction efficiency;

[0032] 4. The vertical drive box, cleaning scraper and scraper blade on one side of the buffer container. When the buffer container rotates, the cleaning scraper can scrape the inner wall of the esterification kettle to prevent the material from remaining on the inner wall of the esterification kettle. The scraper blade can clean the surface of the cleaning scraper under the drive of the reciprocating screw and other components;

[0033] 5. The reciprocating screw, lifting threaded sleeve, magnet and other structures in the vertical drive box realize the lifting and moving of the scraper through the cooperation of the second spur gear and the gear ring in the esterification kettle, ensuring the sealing of the vertical drive box and preventing the material in the reactor from entering;

[0034] 6. The cleaning mechanism in the methanol recovery tank has 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 bristles, so that the bristles can continuously and effectively clean the inner wall of the methanol recovery tank, reducing the frequency of replacement of the cleaning brush;

[0035] 7. The spacing adjustment mechanism can adjust the position of the cleaning brush synchronously and stably from both ends of the horizontal shaft by fixing the support plate, gear plate, connecting frame, limit rod and other components, cooperating with the third spur gear and synchronous shaft, to ensure the parallel state of the cleaning brush and the inner wall of the methanol recovery tank, and the spacing can be conveniently adjusted through the hand wheel, adjustment shaft, polygonal sleeve and polygonal pin. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0037] Figure 1 is a flow chart of the present invention;

[0038] Figure 2 It is a three-dimensional diagram of the esterification kettle of the present invention;

[0039] Figure 3 for Figure 2 A zoomed-in detail of position A in the middle;

[0040] Figure 4 It is a cross-sectional view of the esterification kettle of the present invention from the main perspective;

[0041] Figure 5 It is a three-dimensional cross-sectional view of the esterification kettle of the present invention;

[0042] Figure 6 It is an enlarged detail view of the liquid distributor of the present invention;

[0043] Figure 7 for Figure 6 Enlarged detail of position B in the middle;

[0044] Figure 8 It is a schematic diagram of the internal structure of the esterification kettle of the present invention;

[0045] Fig. 9 is a cross-sectional view of a buffer container of the present invention;

[0046] Fig.10 for Fig. 9 Enlarged detail image of the middle C position;

[0047] Fig.11 A cross-sectional view of a vertical drive box of the present invention from a first viewing angle;

[0048] Fig.12 for Fig.11 Enlarged detail image of the middle D position;

[0049] Fig.13 A second perspective sectional view of the vertical drive box of the present invention;

[0050] Fig.14 for Fig.13 Enlarged detail image of position E in the middle;

[0051] Fig.15 A cross-sectional view of the methanol recovery tank of the present invention from a first viewing angle;

[0052] Fig.16 A cross-sectional view of the methanol recovery tank of the present invention from a second viewing angle;

[0053] Fig.17 for Fig.16 Enlarged detail image of the F position in the middle;

[0054] Fig.18 It is an enlarged detail view of the horizontal rotating shaft of the present invention;

[0055] Fig.19 This is an enlarged detail view of the gear plate position of the present invention;

[0056] Fig. 20 This is an enlarged detail view of the fixed support plate position of the present invention;

[0057] 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 strip; 3053, limit rod; 306, gear plate; 3061, arc limit slot; 307, synchronous shaft; 3071, third spur gear; 3072, polygonal sleeve; 3073, adjusting shaft; 3074, hand wheel; 3075, polygonal latch; 4, vertical shaft; 401, rotary joint; 402, methanol introduction pipe; 403, agitator; 5, buffer container; 501, Pressurizing piston; 502, elastic telescopic rod; 503, vertical drive box; 504, cleaning scraper; 505, reciprocating screw rod; 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, reset 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

[0058] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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 described embodiments 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 creative work are within the scope of protection of the present invention. Example 1

[0059] Reference Figure 1-20A production and preparation system of methyl paraben, comprising an esterification kettle 1, a condenser 2 and a methanol recovery tank 3, wherein a jacket 101 is installed on the outside of the esterification kettle 1, a vertical shaft 4 is rotatably installed on the top of the esterification kettle 1, the bottom end of the vertical shaft 4 extends to the inside of the esterification kettle 1 and a buffer container 5 is fixed on the outside, an agitator 403 is fixed on the bottom end of the vertical shaft 4, the inside of the vertical shaft 4 is hollow and communicated with the buffer container 5, the top end of the vertical shaft 4 is connected to a methanol introduction pipe 402 through a rotary joint 401, and the bottom end of the buffer container 5 is connected to a liquid distributor 6;

[0060] The esterification kettle 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 centrifugally filtered by the centrifugal filtration and drying device 7, the wet material is dried, and the mother liquor is added to the distillation tower 8 for distillation. After distillation, it is condensed and recovered by the condenser 2 to the methanol recovery tank 3 for application;

[0061] The liquid distributor 6 is used to increase the dispersion of methanol and improve the mixing effect.

[0062] 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;

[0063] 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 is meshed with the second bevel gear 404 to drive the vertical rotating shaft 4 to rotate, thereby driving the agitator 403 to stir. Example 2

[0064] 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, 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 evenly distributed in the vertical direction;

[0065] Methanol first enters the buffer container 5, then disperses into each distribution pipe 601, and then dispersedly 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 the movement, further improving the mixing effect. Example 3

[0066] Reference Figure 1-20The 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 outside 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;

[0067] The return spring 605 pushes the sealing plug 604 to block the liquid nozzle 602 without being subjected to external force.

[0068] 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 with the second vertical bar 608 through a telescopic guide rod 607. The first vertical bar 606 and the second vertical bar 608 are fixed with a rack 612 on the side close to each other. A first spur gear 613 is provided between the two racks 612. The two racks 612 are meshed with the first spur 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, and a plurality of arc-shaped protrusions 611 are evenly distributed on the guide ring 610;

[0069] When the buffer container 5 rotates with the vertical rotating shaft 4, the distribution pipe 601 follows the movement. At this time, the trigger member 609 moves along the inner circle 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 spur 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.

[0070] Among them, 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 energy storage, and the communication opening between the vertical rotating shaft 4 and the buffer container 5 is located below the pressurizing piston 501;

[0071] Methanol is continuously transported to 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 to move downward to pressurize the methanol, thereby increasing the pressure when the methanol is sprayed out. Example 4

[0072] Reference Figure 1-20The difference between this embodiment and embodiment 1 is that a vertical driving box 503 is fixed to one side of the buffer container 5, a cleaning scraper 504 is fixed to the side of the vertical driving box 503 away from the buffer container 5, a scraper 511 is connected to the output end of the vertical driving box 503, the scraper 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;

[0073] When the buffer container 5 rotates, the vertical drive box 503 and the cleaning scraper 504 are driven 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 scraper 511 is driven by the vertical drive box 503 to move vertically along the surface of the cleaning scraper 504, thereby cleaning the surface of the cleaning scraper 504.

[0074] Among them, a reciprocating screw rod 505 is installed inside the vertical drive box 503, and 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 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 on the second magnet 510. A second spur gear 507 is fixed on the top of the reciprocating screw rod 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.

[0075] 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. Example 5

[0076] 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, and the cleaning mechanism includes a horizontal rotating shaft 301, and 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, and 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;

[0077] 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.

[0078] The spacing adjustment mechanism includes fixed support plates 304 symmetrically arranged at both ends of the horizontal rotating shaft 301, and the two fixed support plates 304 are provided with gear plates 306 on the sides close to each other. The gear plates 306 are rotatably installed on the outside of the horizontal rotating shaft 301, and a plurality of connecting frames 3051 are slidably installed on the side of the fixed support plates 304 close to the gear plates 306 through the slide rails 305. The limiting rods 3053 are fixed on the connecting frames 3051, and the gear plates 306 are provided with a plurality of arc-shaped limiting slots 3061. The limiting rods 3053 pass through the gear plates 306 through the arc-shaped limiting slots 3061.

[0079] 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 strip 3052 is fixed between a pair of connecting frames 3051, and the cleaning brush 303 is fixed to the connecting strip 3052. By adjusting the position of the connecting frame 3051, the spacing 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.

[0080] 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;

[0081] 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.

[0082] A polygonal sleeve 3072 is fixed at one end of the synchronization shaft 307, an adjustment shaft 3073 is movably installed on the methanol recovery tank 3, a polygonal plug 3075 corresponding to the end of the adjustment shaft 3073 close to the polygonal sleeve 3072 is fixed, and an end of the adjustment 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;

[0083] 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 polygonal sleeve 3072 to 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, and a mechanical seal is provided on the outside of the adjusting rotating shaft 3073. At this time, hold the hand wheel 3074, push the polygonal pin 3075 into the polygonal sleeve 3072, and then turn the hand wheel 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.

[0084] 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 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0085] In the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0086] 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. The present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and circuit connection in detail.

[0087] 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. A production system for methyl paraben, comprising an esterification kettle (1), a condenser (2) and a methanol recovery tank (3), 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 the methanol introduction pipe (402) via a rotating 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), 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; 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 outside 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); The other end of the horizontal movable rod (603) extends to the outside of the distribution pipe (601) and the plurality of horizontal movable rods (603) are all fixed to the first vertical bar (606); the outer wall of the distribution pipe (601) is connected to a second vertical bar (608) via a telescopic guide rod (607); A rack (612) is fixed to one side of the first vertical bar (606) and the second vertical bar (608) that are close to each other, a first spur gear (613) is provided between the two racks (612), and the two racks (612) are meshed with the first spur gear (613); 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); 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 at the top end of the pressurizing piston (501). The elastic telescopic rod (502) is used for storing energy, and the communication opening between the vertical rotating shaft (4) and the buffer container (5) is located below the pressurizing piston (501).

2. A production and preparation system for 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 production and preparation system for methylparaben according to claim 1, characterized in that: A vertical drive box (503) is fixed on one side of the buffer container (5); a cleaning scraper (504) is fixed on the side of the vertical drive box (503) away from the buffer container (5); a scraper (511) is connected to the output end of the vertical drive box (503); the scraper (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).

4. A production and preparation system for methylparaben according to claim 3, characterized in that: A reciprocating screw rod (505) is installed inside the vertical drive 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 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 on the second magnet (510), a second spur gear (507) is fixed at the top end of the reciprocating screw rod (505), a gear ring (508) is fixed inside the esterification kettle (1), and the second spur gear (507) meshes with the gear ring (508).

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