Automatic cleaning esterification kettle for methylparaben production

Abstract

The utility model discloses an automatic cleaning 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 a methanol introducing pipe through a rotating joint; a vertical driving box is fixed to one side of the buffer container, and a cleaning scraper is fixed to the side, away from the buffer container, of the vertical driving box. The vertical driving box, the cleaning scraper and the scraper blade in the esterification kettle can be combined to clean the kettle wall, so that material residues are prevented, the maintenance cost is reduced, and the production efficiency and the product quality are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydroxybenzyl production technical field especially relates to a kind of automatic cleaning 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, and the materials are easy to be left on the inner wall of the reaction kettle. With the reaction, some reactants or reaction products may adhere to the kettle wall, which will affect the heat transfer efficiency of the reaction kettle after long-term accumulation, resulting in unstable reaction conditions. Moreover, it is difficult to clean these residual materials, and if they cannot be effectively removed, they will also pollute the next batch of reaction and affect the stability of product quality. INVENTION CONTENTS

[0006] In order to solve the problems mentioned in the background, the utility model provides an automatic cleaning esterification kettle for hydroxybenzyl production.

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

[0008] An automatic cleaning esterification kettle for hydroxybenzyl production, comprising an esterification kettle, a jacket is installed outside the esterification kettle, a vertical rotating shaft is rotatably installed at the top end of the esterification kettle, the bottom end of the vertical rotating shaft extends into the inside of the esterification kettle and is externally fixed with a buffer container, a stirrer is fixed at the bottom end of the vertical rotating shaft, the vertical rotating shaft is hollow inside and communicates with the buffer container, and the top end of the vertical rotating shaft is connected with a methanol inlet pipe through a rotary joint.

[0009] One side of the buffer container is fixed with a vertical drive box, and the side away from the buffer container of the vertical drive box is fixed with a cleaning scraper.

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

[0011] Preferably, the output end of the vertical drive box is connected with a scraper, the scraper is in contact with the surface of the cleaning scraper, and the cleaning scraper is in contact with the inner wall of the esterification kettle.

[0012] Preferably, a reciprocating screw rod is arranged in the vertical drive box, a lifting threaded sleeve is arranged outside the reciprocating screw rod, a first magnet is fixed on the lifting threaded sleeve, a second magnet is arranged outside the vertical drive box, the first magnet and the second magnet are attracted to each other through the side wall of the vertical drive box, and the scraper is fixed on the second magnet.

[0013] Preferably, a second spur gear is fixed at the top end of the reciprocating screw rod, and a tooth ring is fixed in the esterification kettle.

[0014] Preferably, the bottom end of the buffer container is connected with a liquid distributor.

[0015] Compared with the prior art, the utility model has the beneficial effects that:

[0016] 1. The vertical drive box, the cleaning scraper and the scraper on one side of the buffer container can clean the inner wall of the esterification kettle when the buffer container rotates, prevent the material from remaining on the inner wall of the esterification kettle, and clean the surface of the cleaning scraper under the drive of the reciprocating screw rod and other components.

[0017] 2. The reciprocating screw rod, the lifting threaded sleeve, the magnet and other structures in the vertical drive box realize the lifting movement of the scraper through the cooperation of the second spur gear and the tooth ring in the esterification kettle, ensure the sealing property of the vertical drive box, and avoid the material in the reaction kettle. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

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

[0020] Figure 2 It is the esterification kettle perspective view of the utility model;

[0021] Figure 3 It is Figure 2 The A position detail view in the middle;

[0022] Figure 4 It is the esterification kettle main view cutaway view of the utility model;

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

[0024] Figure 6 It is an enlarged detail view of the liquid distributor of the utility model;

[0025] Figure 7 It is Figure 6 An enlarged detail view of the B position;

[0026] Figure 8 It is a schematic view of the internal structure of the esterification kettle of the utility model;

[0027] Figure 9 It is a sectional view of the buffer container of the utility model;

[0028] Figure 10 It is Figure 9 An enlarged detail view of the C position;

[0029] Figure 11 It is a first perspective sectional view of the vertical drive box of the utility model;

[0030] Figure 12 It is Figure 11 An enlarged detail view of the D position;

[0031] Figure 13 It is a second perspective sectional view of the vertical drive box of the utility model;

[0032] Figure 14 It is Figure 13 An enlarged detail view of the E position;

[0033] Figure 15 It is a first perspective sectional view of the methanol recovery tank of the utility model;

[0034] Figure 16 It is a second perspective sectional view of the methanol recovery tank of the utility model;

[0035] Figure 17 It is Figure 16 An enlarged detail view of the F position;

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

[0037] Figure 19 It is an enlarged detail view of the gear disc position of the utility model;

[0038] Figure 20 It is an enlarged detail view of the fixed support disc position of the utility model;

[0039] In the figure: 1, esterification kettle; 101, jacket; 2, condenser; 3, methanol recovery tank; 301, horizontal rotating shaft; 302, second rotating motor; 303, cleaning brush; 3031, bristles; 304, fixed support disc; 305, sliding rail; 3051, connecting frame; 3052, connecting strip; 3053, limiting rod; 306, gear disc; 3061, arc-shaped limiting through groove; 307, synchronous shaft; 3071, third straight gear; 3072, polygonal sleeve; 3073, adjusting rotating shaft; 3074, hand wheel; 3075, polygonal bolt; 4, vertical rotating shaft; 401, rotating joint; 402, methanol introduction pipe; 403, stirrer; 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 straight gear; 508, tooth ring; 509, first magnet; 510, second magnet; 511, scraper; 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-shaped protrusion; 612, rack; 613, first straight gear; 7, centrifugal filtering and drying device; 8, rectifying column. DETAILED DESCRIPTION

[0040] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0041] Embodiment 1

[0042] Reference Figures 1-20 An automatic cleaning esterification kettle for producing hydroxybenzyl ester, comprising an esterification kettle 1, a condenser 2 and a methanol recovery tank 3, a jacket 101 is installed outside the esterification kettle 1, a vertical rotating shaft 4 is rotatably installed at the top end of the esterification kettle 1, a buffer container 5 is fixed at the bottom end of the vertical rotating shaft 4 and extends into the esterification kettle 1, a stirrer 403 is fixed at the bottom end of the vertical rotating shaft 4, the vertical rotating shaft 4 is hollow and communicates with the buffer container 5, the top end of the vertical rotating shaft 4 is connected with a methanol introduction pipe 402 through a rotating joint 401, and a liquid distributor 6 is connected to the bottom end of the buffer container 5.

[0043] The esterification kettle 1 sucks the appropriate solid p-hydroxybenzoic acid through vacuum, then introduces methanol through the methanol introduction pipe 402, and stirs during the introduction of methanol to promote the mixing of methanol and p-hydroxybenzoic acid and accelerate the esterification reaction. After the reaction is completed, the material is centrifuged and filtered through the centrifugal filtration and drying device 7, the wet material is dried, and the filtered mother liquor is added to the rectification tower 8 for rectification. After rectification, the condensate is recovered to the methanol recovery tank 3 through the condenser 2 for reuse.

[0044] The liquid distributor 6 improves the dispersion of methanol and improves the mixing effect.

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

[0046] By starting the first rotary motor 405, the first rotary 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 stirred.

[0047] Embodiment 2

[0048] Referring to Figures 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 injection pipes 602 are connected to the distribution pipes 601, the liquid injection pipes 602 are horizontally arranged, and the plurality of liquid injection pipes 602 are equidistantly distributed in the vertical direction.

[0049] Methanol first enters the buffer container 5, then is dispersed into each distribution pipe 601, and is then dispersed and sprayed out through the liquid injection pipe 602, thereby improving the mixing effect. When the vertical rotating shaft 4 rotates, the buffer container 5 can be driven to rotate, thereby driving the distribution pipes 601 to move, and further improving the mixing effect.

[0050] Embodiment 3

[0051] Referring to Figures 1-20 The difference between this embodiment and embodiment 2 is that a horizontal movable rod 603 is installed at a position corresponding to the liquid injection pipe 602 in the distribution pipe 601, a return spring 605 is installed outside the horizontal movable rod 603, and a plugging plug 604 corresponding to the liquid injection pipe 602 is fixed to one end of the horizontal movable rod 603.

[0052] The return spring 605 pushes the plugging plug 604 to block the liquid injection pipe 602 under the condition of no external force.

[0053] Wherein, the other end of the horizontal movable rod 603 extends to the outside of the distribution pipe 601, and the horizontal movable rods 603 are all fixed with the first vertical strip 606, the outer wall of the distribution pipe 601 is connected with the second vertical strip 608 through the telescopic guide rod 607, the side of the first vertical strip 606 and the second vertical strip 608 close to each other are both fixed with the gear rack 612, the first straight gear 613 is arranged between the two gear racks 612, the two gear racks 612 are engaged with the first straight gear 613, the side of the second vertical strip 608 away from the distribution pipe 601 is fixed with the trigger 609, the trigger 609 is a circular ring structure, the inner wall of the esterification kettle 1 is fixed with the guide ring 610, and the guide ring 610 is equidistantly distributed with a plurality of arc protrusions 611;

[0054] When the buffer container 5 rotates along with the vertical rotating shaft 4, the distribution pipe 601 moves, at this time, the trigger 609 moves along the inner ring of the guide ring 610, when the trigger 609 moves to the position of the arc protrusion 611, the second vertical strip 608 is pushed towards the first vertical strip 606, at this time, since the two gear racks 612 are engaged with the first straight gear 613, the first vertical strip 606 can also be driven to move towards the second vertical strip 608, at this time, the reset spring 605 is compressed, the blocking plug 604 leaves the liquid injection pipe 602, and the liquid injection pipe 602 can be intermittently opened, so that the methanol is intermittently sprayed, the pressure of the methanol sprayed can be improved, and the mixing effect can be improved.

[0055] Wherein, the buffer container 5 is provided with the pressurizing piston 501, the pressurizing piston 501 and the inner wall of the top end of the pressurizing piston 501 are provided with the elastic telescopic rod 502, 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;

[0056] The methanol is continuously conveyed into the buffer container 5, when the liquid injection pipe 602 is in the blocking state, the hydraulic pressure rises, at this time, the pressurizing piston 501 is pushed upwards, the elastic telescopic rod 502 is compressed and stored, when the liquid injection pipe 602 is opened, the elastic telescopic rod 502 pushes the pressurizing piston 501 to move downwards to pressurize the methanol, and the pressure of the methanol sprayed can be improved.

[0057] Embodiment 4

[0058] 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 the vertical driving box 503, the side of the vertical driving box 503 away from the buffer container 5 is fixed with the cleaning scraper 504, the output end of the vertical driving box 503 is connected with the 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;

[0059] When the buffer container 5 rotates, the vertical drive box 503 and the cleaning scraper 504 are driven to rotate, and 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 cannot be left on the inner wall of the esterification kettle 1 and cannot be discharged. The vertical drive box 503 drives the scraping piece 511 to move vertically along the surface of the cleaning scraper 504, so that the surface of the cleaning scraper 504 can be cleaned.

[0060] The reciprocating screw rod 505 is installed in the vertical drive box 503, the lifting threaded sleeve 506 is installed outside the reciprocating screw rod 505, the first magnet 509 is fixed on the lifting threaded sleeve 506, the second magnet 510 is installed outside the vertical drive box 503, the first magnet 509 and the second magnet 510 are attracted to each other through the side wall of the vertical drive 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 the second straight gear 507, and the inside of the esterification kettle 1 is fixed with the tooth ring 508, and the second straight gear 507 is engaged with the tooth ring 508.

[0061] When the buffer container 5 rotates, the second straight 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 magnetic attraction, and then drive the scraping piece 511 to move up and down. This driving mode can ensure the sealing of the vertical drive box 503 and prevent the materials in the reaction kettle from entering the inside of the vertical drive box 503.

[0062] Example 5

[0063] Referring to Figures 1-20 The difference between this embodiment and example 1 is that the methanol recovery tank 3 is internally provided with a cleaning mechanism, 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, the cleaning brushes 303 are provided with brush hairs 3031 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.

[0064] 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 inner wall of the methanol recovery tank 3 is cleaned by the brush hairs 3031, and the cleaning efficiency is improved. Because the spacing between the cleaning brushes 303 and the horizontal rotating shaft 301 is adjustable, after the brush hairs 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 brush hairs 3031 are closer to the inner wall of the methanol recovery tank 3, so that the cleaning can be normally carried out, the frequency of replacing the cleaning brushes 303 can be reduced, and the maintenance cost is reduced.

[0065] The distance adjusting mechanism comprises fixed support discs 304 symmetrically arranged at both ends of the horizontal rotating shaft 301, gear discs 306 arranged on the sides close to each other of the two fixed support discs 304, the gear discs 306 being rotatably installed outside the horizontal rotating shaft 301, a plurality of connecting frames 3051 being slidably installed on the sides close to the gear discs 306 of the fixed support discs 304 through slide rails 305, limiting rods 3053 being fixed on the connecting frames 3051, a plurality of arc-shaped limiting through grooves 3061 being formed in the gear discs 306, and the limiting rods 3053 penetrating through the gear discs 306 through the arc-shaped limiting through grooves 3061;

[0066] When the gear discs 306 rotate relative to the horizontal rotating shaft 301, the connecting frames 3051 can slide in the slide rails 305 and the positions of the connecting frames 3051 can be adjusted due to the limiting rods 3053 being located in the arc-shaped limiting through grooves 3061. A connecting strip 3052 is fixed between a pair of connecting frames 3051, and the cleaning brushes 303 are fixed with the connecting strip 3052. The distance 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 multiple cleaning brushes 303 can be adjusted synchronously.

[0067] The third spur gears 3071 are rotatably installed on the fixed support discs 304, the third spur gears 3071 are engaged with the gear discs 306, and a synchronous shaft 307 is connected between the two third spur gears 3071.

[0068] When the synchronous shaft 307 rotates, the two third spur gears 3071 can synchronously rotate, and the two gear discs 306 can synchronously rotate, so that the cleaning brushes 303 can be synchronously moved close to and away from the horizontal rotating shaft 301 from both ends of the horizontal rotating shaft 301. The driving is more stable, and the parallel state between the cleaning brushes 303 and the inner wall of the methanol recovery tank 3 can be ensured.

[0069] The synchronous shaft 307 is fixed with a plurality of deformation sleeves 3072 at one end, the methanol recovery tank 3 is movably installed with an adjusting rotating shaft 3073, the adjusting rotating shaft 3073 is fixed with a plurality of polygonal plugs 3075 corresponding to the deformation sleeves 3072 at one end close to the deformation sleeves 3072, the adjusting rotating shaft 3073 is fixed with a hand wheel 3074 at one end away from the polygonal plugs 3075 and extending to the outside of the methanol recovery tank 3.

[0070] When the distance between the cleaning brush 303 and the horizontal rotating shaft 301 needs to be adjusted, only need to stop the multi-deformation sleeve 3072 to the position of the polygonal plug 3075, adjust the rotating shaft 3073 to pass through the side wall of the methanol recovery tank 3, can be horizontally movable and rotating, and the adjusting rotating shaft 3073 is externally provided with a mechanical seal, at this time, the hand wheel 3074 is held, the polygonal plug 3075 is pushed 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 distance between the cleaning brush 303 and the horizontal rotating shaft 301 can be conveniently adjusted.

[0071] 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 is based on the orientation or positional relationship shown in the drawings, and is 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.

[0072] 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, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication between two elements or the interaction relationship between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0073] The control mode of the present application is automatically controlled by a controller, and the control circuit of the controller can be realized by simple programming of those skilled in the art, and the power supply also belongs to the common knowledge in the art, and the present application is mainly used for protecting mechanical devices, so the control mode and circuit connection of the present application will not be explained in detail.

[0074] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An automatic cleaning esterification kettle for the production of methyl paraben, 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), and the top of the vertical rotating shaft (4) is connected to the methanol introduction pipe (402) via a rotary joint (401); A vertical drive box (503) is fixed to one side of the buffer container (5), and a cleaning scraper (504) is fixed to the side of the vertical drive box (503) away from the buffer container (5).

2. The automatic cleaning esterification kettle for producing methylparaben according to claim 1, wherein: 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. The automatic cleaning esterification kettle for the production of methylparaben according to claim 1, wherein: The output end of the vertical drive box (503) is connected to a scraper (511), the scraper (511) contacts the surface of the cleaning scraper (504), and the cleaning scraper (504) contacts the inner wall of the esterification kettle (1).

4. The automatic cleaning esterification kettle for the production of methylparaben according to claim 1, wherein: A reciprocating screw rod (505) is installed inside the vertical drive box (503), a lifting thread sleeve (506) is installed outside the reciprocating screw rod (505), a first magnet (509) is fixed on the lifting thread sleeve (506), and 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).

5. The automatic cleaning esterification kettle for the production of methylparaben according to claim 4, characterized in that: A second spur gear (507) is fixed to the top of the reciprocating screw (505), a gear ring (508) is fixed inside the esterification kettle (1), and the second spur gear (507) is meshed with the gear ring (508).

6. The automatic cleaning esterification kettle for producing methylparaben according to claim 1, wherein: The bottom end of the buffer container (5) is connected to a liquid distributor (6).

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