Esterification reaction device for preparing methyl salicylate

Abstract

The utility model relates to the field of methyl salicylate, in particular to a methyl salicylate preparation esterification reaction device which comprises a reaction kettle, the electric heater is arranged in the reaction kettle and used for heating, an inner container is arranged in the reaction kettle, and the electric heater is arranged in the reaction kettle and the inner container. According to the esterification reaction device for preparing methyl salicylate, through the arrangement of the reaction kettle, the inner container, the racks and the stirring mechanism, the driving motor drives the connecting base below to rotate, the connecting base rotates to drive the gears on the two sides to rotate, and the gears are meshed and linked with the internal racks, so that the stirring plates below the gears can rotate automatically; the stirring plates are matched with the stirring blades to rotate and stir together, so that the stirring efficiency is greatly improved, rapid stirring of the reaction kettle is realized, uniform stirring of raw materials is also ensured, and the stirring plates can be in contact with the inner wall of the inner container in the autorotation process of the stirring plates, so that residual esterified substances on the surface of the inner wall of the inner container are scraped.

Description

Technical Field

[0001] The utility model relates to the field of methyl salicylate, in particular to an esterification reaction device for preparing methyl salicylate. Background Art

[0002] Methyl salicylate, also known as wintergreen oil and sweet birch oil, is a colorless to light yellow liquid with a special herbal smell and a sweet and spicy taste. It has a melting point of -8.6°C and a boiling point of 218-224°C (partially decomposes when boiling). It is used as a topical erythematizing agent. During the production process, methyl salicylate is produced by an esterification reaction of salicylic acid and methanol in the presence of an acidic catalyst.

[0003] After searching, a utility model methyl salicylate efficient preparation device with publication number CN211964169U is found, comprising a reactor shell, a top cover is threadedly connected to the top of the reactor shell, a reducer is fixedly connected to the top surface of the top cover, an input end of the reducer is fixedly connected to a motor, an output shaft of the reducer is fixedly connected to a main shaft, the main shaft is rotatably connected to the top cover, a stirring paddle for stirring methyl salicylate liquid is fixedly connected to the main shaft, and the characteristic is that: a vent hole for balancing the air pressure inside and outside the reactor shell is opened on the top cover, an outer cover and an inner cover are arranged in the vent hole, the outer cover is used in conjunction with the vent hole, the inner cover is threadedly connected to the top cover, and a connecting component for connecting the outer cover and the inner cover is arranged between the outer cover and the inner cover, so as to achieve the effect of balancing the air pressure inside and outside the reactor shell and allowing the product to be discharged smoothly.

[0004] The existing methyl salicylate is only stirred in one direction during the esterification reaction, which has low stirring efficiency and cannot achieve rapid and uniform stirring and fusion, resulting in a low reaction rate. The methyl salicylate high-efficiency preparation device in the above-mentioned comparative case also only has simple one-way rotating stirring during the reaction process, and such stirring form cannot achieve uniform stirring and fusion, thereby wasting too much time in the esterification reaction.

[0005] Therefore, it is necessary to invent a methyl salicylate preparation esterification reaction device to solve the above problems. Utility Model Content

[0006] The utility model aims to provide an esterification reaction device for preparing methyl salicylate to solve the problems raised in the above background technology.

[0007] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a methyl salicylate preparation esterification reaction device, comprising a reaction kettle;

[0008] An electric heater is arranged inside the reaction kettle for heating. An inner tank is arranged inside the reaction kettle. The electric heater is arranged inside the reaction kettle and the inner tank. A rack is fixedly installed above the inner tank. The rack is arranged in a circular shape. A discharge port is arranged below the reaction kettle.

[0009] An upper cover is fixed on the top of the reactor, and bolts are passed through both sides of the upper cover for disassembling and assembling the upper cover. A feed inlet is provided on one side above the upper cover;

[0010] A stirring mechanism, arranged inside the upper cover, for stirring methyl salicylate;

[0011] The support frames are arranged on both sides of the reaction kettle and are used to support the reaction kettle.

[0012] Preferably, the stirring mechanism includes a driving motor, a connecting rod, a connecting seat, a connecting frame, a fixed rod, a gear, a stirring plate, a transmission rod, and a stirring blade. The driving motor is fixedly arranged above the upper cover, a connecting rod is fixedly installed at the lower end of the driving motor, a connecting seat is fixedly installed below the connecting rod, connecting frames are fixedly installed on both sides of the connecting seat, one end of the connecting frame is sleeved on the outside of the fixed rod, a gear is fixedly installed on the outside of the fixed rod, and a stirring plate is fixedly installed at the lower end of the fixed rod.

[0013] Preferably, a transmission rod is fixedly installed below the connecting seat, and a stirring blade is arranged outside the lower part of the transmission rod.

[0014] Preferably, the gear is meshedly connected with the rack, and the stirring plate is rotationally connected with the rack via the gear.

[0015] Preferably, a first connecting column is fixedly installed on one side of the reactor, a clamp is installed on the outside of the first connecting column, the support frame is fixed under the clamp, and a servo motor is arranged on the other side of the support frame.

[0016] Preferably, a first turntable is fixedly mounted on one side of the servo motor, a transmission belt is movably connected to the outside of the first turntable, a second turntable is movably connected to the other side of the transmission belt, a second connecting column is fixedly mounted on one side of the second turntable, and the second connecting column is fixed on the other side of the reactor.

[0017] In the above technical solution, the technical effects and advantages provided by the utility model are:

[0018] 1. Through the arrangement of the reactor, the inner tank, the rack and the stirring mechanism, the driving motor drives the connecting seat below to rotate, and the rotation of the connecting seat drives the gears on both sides to rotate. The gears are meshed with the internal racks to enable the stirring plate below the gear to rotate and rotate and stir together with the stirring blades, which greatly improves the stirring efficiency, realizes rapid stirring of the reactor, and ensures that the raw materials are stirred evenly. At the same time, during the self-rotation of the stirring plate, the stirring plate can contact the inner wall of the inner tank, so that the esterification remaining on the inner wall surface of the inner tank can be scraped off;

[0019] 2. Through the arrangement of the reactor, the servo motor, the first turntable, the transmission belt, the second turntable and the second connecting column, during the esterification reaction of methyl salicylate, the first turntable and the transmission belt are driven to rotate by starting the servo motor, and the second turntable and the second connecting column are driven to rotate by the rotation of the transmission belt, so that the entire reactor swings. Such an arrangement can also improve the efficiency of stirring and fusion. At the same time, when the interior of the reactor is subsequently cleaned, the reactor is tilted to facilitate the staff to clean the interior. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the inner tank structure of the utility model;

[0023] Figure 3 This is a schematic diagram of the upper cover structure of the utility model;

[0024] Figure 4 This is a schematic diagram of the stirring mechanism structure of the utility model;

[0025] Figure 5 It is a schematic diagram of the transmission belt structure of the utility model.

[0026] Description of reference numerals:

[0027] 1. Reactor; 2. Inner tank; 3. Electric heating; 4. Rack; 5. Upper cover; 6. Bolts; 7. Feed inlet; 8. Stirring mechanism; 801. Drive motor; 802. Connecting rod; 803. Connecting seat; 804. Connecting frame; 805. Fixing rod; 806. Gear; 807. Stirring plate; 808. Transmission rod; 809. Stirring blade; 9. Discharge port; 10. First connecting column; 11. Clamp; 12. Support frame; 13. Servo motor; 14. First turntable; 15. Transmission belt; 16. Second turntable; 17. Second connecting column. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0029] The utility model provides Figure 1-5 The esterification reaction device for preparing methyl salicylate shown includes a reaction kettle 1;

[0030] The electric heater 3 is arranged inside the reactor 1 for heating. The reactor 1 is provided with an inner liner 2. The electric heater 3 is arranged inside the reactor 1 and the inner liner 2. A rack 4 is fixedly installed on the upper part of the inner liner 2. The rack 4 is arranged in a circular shape. A discharge port 9 is arranged below the reactor 1.

[0031] An upper cover 5 is fixed on the reactor 1. Bolts 6 are passed through both sides of the upper cover 5 for disassembling and assembling the upper cover 5. A feed port 7 is provided on one side of the upper cover 5.

[0032] A stirring mechanism 8 is arranged inside the upper cover 5 and is used for stirring methyl salicylate;

[0033] The support frame 12 is arranged on both sides of the reactor 1 and is used to support the reactor 1. The driving motor 801 drives the connecting seat 803 below to rotate, and the rotation of the connecting seat 803 drives the gears 806 on both sides to rotate. The gear 806 is meshed with the internal rack 4 to enable the stirring plate 807 below the gear 806 to rotate and rotate and stir together with the stirring blade 809, which greatly improves the stirring efficiency, realizes rapid stirring of the reactor 1, and ensures that the raw materials are stirred evenly. At the same time, during the rotation of the stirring plate 807, the stirring plate 807 can contact the inner wall of the inner tank 2, so that the esterification remaining on the inner wall surface of the inner tank 2 can be scraped off.

[0034] like Figure 1 , Figure 3 and Figure 4As shown, the stirring mechanism 8 includes a driving motor 801, a connecting rod 802, a connecting seat 803, a connecting frame 804, a fixed rod 805, a gear 806, a stirring plate 807, a transmission rod 808, and a stirring blade 809. The driving motor 801 is fixedly arranged above the upper cover 5, and the lower end of the driving motor 801 is fixedly installed with a connecting rod 802, and the lower part of the connecting rod 802 is fixedly installed with a connecting seat 803, and the two sides of the connecting seat 803 are fixedly installed with connecting frames 804, and one end of the connecting frame 804 is sleeved on the outside of the fixed rod 805, and the outside of the fixed rod 805 is fixedly installed with a gear 806, and the lower end of the fixed rod 805 is fixedly installed with a stirring plate 807. Through the stirring mechanism 8, the stirring plate 807 can rotate in coordination with the stirring blade 809 to fully stir and fuse the internal esterified product, thereby improving the esterification reaction of methyl salicylate preparation.

[0035] like Figure 4 As shown, a transmission rod 808 is fixedly installed below the connecting seat 803, and a stirring blade 809 is arranged on the lower outside of the transmission rod 808. The connecting seat 803 is driven to rotate by the driving motor 801, so that the transmission rod 808 and the stirring blade 809 below stir and fuse the esterified product inside the inner tank 2.

[0036] like Figure 4 As shown, the gear 806 is meshedly connected with the rack 4, and the stirring plate 807 is rotatably connected with the rack 4 through the gear 806. The meshing linkage between the gear 806 and the rack 4 enables the stirring plate 807 to rotate, thereby fully stirring the esterified product inside.

[0037] like Figure 1 , Figure 3 and Figure 5 As shown, a first connecting column 10 is fixedly installed on one side of the reactor 1, a clamp 11 is installed on the outside of the first connecting column 10, a support frame 12 is fixed under the clamp 11, and a servo motor 13 is arranged on the other side of the support frame 12. During the swinging process of the first connecting column 10 and the reactor 1, they are limited by the clamp 11 to enhance stability.

[0038] like Figure 1 , Figure 3 and Figure 5As shown, a first turntable 14 is fixedly installed on one side of the servo motor 13, a transmission belt 15 is movably connected to the outside of the first turntable 14, a second turntable 16 is movably connected to the other side of the transmission belt 15, a second connecting column 17 is fixedly installed on one side of the second turntable 16, and the second connecting column 17 is fixed to the other side of the reactor 1. The first turntable 14 and the transmission belt 15 are driven to rotate by starting the servo motor 13, and the second turntable 16 and the second connecting column 17 are driven to rotate by the rotation of the transmission belt 15, so that the entire reactor 1 swings. Such a setting can also improve the efficiency of stirring and fusion. At the same time, when the interior of the reactor 1 is subsequently cleaned, the reactor 1 is tilted to facilitate the staff to clean the interior.

[0039] The working principle of the utility model is as follows: firstly, the external power supply is turned on, and then salicylic acid, methanol and an acid catalyst are poured into the reaction kettle 1 respectively, and then the electric heating 3 switch is turned on to ensure the catalytic effect in the synthesis process of methyl salicylate, and then the drive motor 801 switch is turned on to drive the connecting rod 802 and the connecting seat 803 below to rotate, and when the connecting seat 803 rotates, the fixed rod 805 and the gear 806 are driven to rotate through the connecting frames 804 on both sides, and one end of the connecting frame 804 is sleeved on the fixed rod 805, so the gear 806 is meshed with the internal gear 806 during the rotation process, so that the gear 806 and the stirring plate 807 below form self-rotation, and when the connecting seat 803 rotates, the stirring blade 809 below is driven to rotate, so as to stir the internal materials. The mixture is fully stirred and fused. At the same time, the stirring plate 807 can contact the inner wall of the liner 2 during the rotation, so that the esterification product remaining on the inner wall surface of the liner 2 is scraped off. Then, the servo motor 13 switch is turned on to drive the first turntable 14 and the transmission belt 15 to rotate. The second turntable 16 and the second connecting column 17 are driven by the rotation of the transmission belt 15 to rotate, so that the entire reactor 1 swings, thereby improving the stirring and fusion efficiency. After the esterification reaction of methyl salicylate is completed, the electric heating 3 switch is turned off, the stirring mechanism 8 and the stirring mechanism 8 switch are turned off, and finally the switch valve outside the discharge port 9 is opened to discharge the methyl salicylate. Finally, when the device is not used, the external power supply is cut off. In this way, the use process of the methyl salicylate preparation esterification reaction device is completed.

[0040] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A methyl salicylate preparation esterification reaction device, Features: It comprises a reaction kettle (1); An electric heater (3) is arranged inside the reaction kettle (1) for heating. An inner pot (2) is arranged inside the reaction kettle (1). The electric heater (3) is arranged inside the reaction kettle (1) and the inner pot (2). A rack (4) is fixedly installed above the inner pot (2). The rack (4) is arranged in a circular shape. A discharge port (9) is arranged below the reaction kettle (1); An upper cover (5) is fixed on the top of the reaction kettle (1), and bolts (6) are passed through both sides of the upper cover (5) for disassembling and assembling the upper cover (5). A feed inlet (7) is provided on one side above the upper cover (5); A stirring mechanism (8) is arranged inside the upper cover (5) and is used to stir the methyl salicylate; The support frame (12) is arranged on both sides of the reaction kettle (1) and is used to support the reaction kettle (1).

2. The esterification reaction device for preparing methyl salicylate according to claim 1, Features: The stirring mechanism (8) comprises a driving motor (801), a connecting rod (802), a connecting seat (803), a connecting frame (804), a fixed rod (805), a gear (806), a stirring plate (807), a transmission rod (808), and a stirring blade (809); the driving motor (801) is fixedly arranged above the upper cover (5); the lower end of the driving motor (801) is fixedly mounted with a connecting rod (802); the lower part of the connecting rod (802) is fixedly mounted with a connecting seat (803); the two sides of the connecting seat (803) are fixedly mounted with connecting frames (804); one end of the connecting frame (804) is sleeved on the outside of the fixed rod (805); the outside of the fixed rod (805) is fixedly mounted with a gear (806); and the lower end of the fixed rod (805) is fixedly mounted with a stirring plate (807).

3. The esterification reaction device for preparing methyl salicylate according to claim 2, Features: A transmission rod (808) is fixedly mounted below the connection seat (803), and a stirring blade (809) is arranged outside the lower side of the transmission rod (808).

4. The esterification reaction device for preparing methyl salicylate according to claim 2, Features: The gear (806) is meshedly connected to the rack (4), and the stirring plate (807) is rotationally connected to the rack (4) via the gear (806).

5. The esterification reaction device for preparing methyl salicylate according to claim 1, Features: A first connecting column (10) is fixedly mounted on one side of the reaction kettle (1), a clamp (11) is mounted on the outside of the first connecting column (10), the support frame (12) is fixed below the clamp (11), and a servo motor (13) is arranged on the other side of the support frame (12).

6. The esterification reaction device for preparing methyl salicylate according to claim 5, Features: A first turntable (14) is fixedly mounted on one side of the servo motor (13); a transmission belt (15) is movably connected to the outside of the first turntable (14); a second turntable (16) is movably connected to the other side of the transmission belt (15); a second connecting column (17) is fixedly mounted on one side of the second turntable (16); and the second connecting column (17) is fixed to the other side of the reaction kettle (1).

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