Esterification reaction device for preparing methyl salicylate

Abstract

The utility model relates to the technical field of sewage treatment, in particular to a methyl salicylate preparation esterification reaction device which comprises a container, an upper cover arranged at the upper end of the container and a stirrer connected to the upper cover, the stirrer comprises a stirring head extending into the container, the stirring head is provided with a central shaft, and the central shaft penetrates through the upper cover and extends into the container; the stirring head is further provided with a stirring frame, the stirring frame is connected to the central shaft, and the stirring frame is arranged in the container; the center shaft is further sleeved with a stirring disc, and the stirring disc is in sliding fit with the center shaft. The center shaft is provided with a hollow channel, the channel coincides with the axis of the center shaft, and a sliding block sliding up and down is arranged in the channel. A driving magnet is arranged in the sliding block; a driven magnet is arranged in the stirring disc; the active magnet and the passive magnet attract each other through magnetic force; a reciprocating driving mechanism for driving the slide to reciprocate up and down is also arranged in the channel; vertical stirring of the stirring disc is combined with transverse stirring of the stirring frame, so that separation or vortex dead angles during stirring are avoided, and the mixing effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to salicylic acid preparation technical field, concretely relates to salicylic acid methyl ester reaction device. BACKGROUND

[0002] The synthesis reaction of salicylic acid methyl ester is an esterification reaction, which is a condensation reaction between carboxylic acid and alcohol. The esterification reaction is usually carried out in a reaction kettle to improve the synthesis efficiency and product quality of salicylic acid methyl ester.

[0003] However, the mixture concentration is very large when salicylic acid methyl ester is subjected to esterification reaction, and the mixture has certain viscosity when mixed. The mechanical stirring of the general reaction kettle only forms unidirectional flow, which easily leads to stratification of reactants or vortex dead angle, and poor mixing uniformity. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of salicylic acid methyl ester preparation esterification reaction device to solve at least one of the above technical problems.

[0005] The technical problem solved by the utility model can be realized by the following technical solutions:

[0006] A kind of salicylic acid methyl ester preparation esterification reaction device, including container, the container upper end has upper cover, still including the stirrer connected in upper cover.

[0007] The stirrer includes a stirring head extending into the container, the stirring head is provided with a central axis, the central axis passes through the upper cover and extends into the container;

[0008] The stirring head is also provided with a stirring frame, which is connected to the central axis, and the stirring frame is arranged in the container;

[0009] The central axis is also sleeved with a disc that slides up and down, called stirring disc, the stirring disc is in sliding cooperation with the central axis, and the stirring disc has a distance from the edge of the stirring frame;

[0010] The central axis has a hollow channel, the channel coincides with the axis of the central axis, and a slider that slides up and down is arranged in the channel;

[0011] The slider is provided with a magnet, called active magnet;

[0012] Another magnet, called passive magnet, is arranged in the stirring disc;

[0013] The active magnet on the slider and the passive magnet of the stirring disc are oppositely arranged, and the active magnet and the passive magnet are magnetically attracted;

[0014] The channel is also provided with a reciprocating drive mechanism that drives the slider to slide up and down.

[0015] The above design, first, by setting the stirrer, the stirring frame of the stirrer can transversely stir the mixture of methyl salicylate during esterification reaction, improve the reaction speed at the same time stirring the mixed reaction more evenly; second, by setting the up and down sliding stirring disc, the stirring disc can mix and stir the layered reactants, the up and down stirring of the stirring disc combined with the transverse stirring of the stirring frame, avoid the stirring to appear into or vortex dead angle, improve the mixing effect; finally, the stirring disc is driven by the active magnet and the passive magnet, the magnetic force transmission can make the center shaft smooth sealing, especially suitable for long-term stable operation of acid catalyst and heating environment, magnetic drive reduces mechanical wear parts, prolongs the service life of the equipment and reduces the maintenance frequency.

[0016] Preferably, the reciprocating drive mechanism includes a threaded rod, the threaded rod is inserted into the channel; the sliding block is provided with a threaded hole, the threaded hole is threadedly matched with the threaded rod; a strip-shaped groove is arranged in the channel, the strip-shaped groove is arranged along the center line of the channel; the sliding block is provided with an overhanging structure, the overhanging structure extends into the strip-shaped groove and is in sliding fit with the strip-shaped groove. By setting the threaded rod to rotate, the strip-shaped groove clamps the sliding block, and the threaded rod rotates to drive the sliding block to slide up and down, thereby driving the stirring disc to move up and down, the threaded transmission enables the sliding block to have sufficient power, ensuring the stable operation of the stirring disc in the high-concentration mixture with a certain viscosity.

[0017] Preferably, the center shaft is further provided with a containing cavity, the containing cavity is arranged above the channel and communicates with the channel; the reciprocating drive mechanism has a bidirectional motor, the bidirectional motor is arranged in the containing cavity, a drive shaft of the bidirectional motor is connected with the threaded rod, and the drive shaft drives the threaded rod to rotate. By setting the bidirectional motor, the threaded rod can rotate forward and backward, ensuring the stable operation of the stirring disc up and down.

[0018] Preferably, the channel is further provided with two commutating switches for switching the rotation direction of the bidirectional motor, the two commutating switches are respectively arranged on the upper and lower sides of the sliding block, and the triggering structures of the commutating switches are all directed to the sliding block. By setting the commutating switch, the bidirectional motor triggers the commutating switch through the up and down operation of the sliding block, so that the reciprocating drive mechanism drives the sliding block to operate up and down simply and reliably.

[0019] Preferably, two perfluoroether rubber material check rings are arranged on the central shaft, and the two check rings are arranged on the upper and lower sides of the stirring disc respectively, and the distance between the two check rings forms the stroke of the up-down movement of the stirring disc. The up-down movement of the stirring disc is prevented from colliding with the stirring frame, and the stable and reliable operation of the device is ensured. The perfluoroether rubber material can withstand concentrated sulfuric acid, toluene and other strong corrosive media and can withstand at least 300 degrees of temperature, and is suitable for long-term stable operation in the methyl salicylate preparation esterification reaction device.

[0020] Preferably, stirring blades are arranged in the stirring disc. When the stirring blades slide up and down with the stirring disc, the layered liquid surface (such as water phase and organic phase separation) formed due to the density difference can be forcedly broken, the contact between salicylic acid and methanol is ensured, the side reaction is reduced, and the ester conversion rate is improved.

[0021] Preferably, the central shaft is made of 316L stainless steel. The 316L stainless steel is resistant to high temperature and acid corrosion and has no magnetism, so that the long-term stable operation is ensured without affecting the magnetism between the active magnet and the passive magnet.

[0022] Preferably, the stirring frame is provided with stirring blades, and the stirring blades have a distance of 10cm-20cm from the stirring disc. The transverse rotary stirring of the stirring frame is not affected while the stirring disc is stirred up and down, and the safety and reliability of the device operation is improved.

[0023] Preferably, the hole matched with the stirring disc and the central shaft is a circular hole, the passive magnet is arranged in the side wall of the circular hole in at least 6 uniform arrangements, the sliding block is a cylindrical sliding block, the active magnet is arranged in the side wall of the outer circumference of the sliding block in at least 6 uniform arrangements, and the at least 6 passive magnets and the at least 6 active magnets are arranged in one-to-one correspondence. The active magnet and the passive magnet are arranged in one-to-one correspondence and uniform arrangement (≥6 groups), can form a symmetrical magnetic field distribution, reduce the torque fluctuation caused by the uneven local magnetic force, ensure the synchronous movement of the disc and the sliding block, and reduce the friction on the central shaft. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating labor. Among them:

[0025] Figure 1 is a schematic diagram of the internal structure of the device of the present application;

[0026] Figure 2 is a schematic diagram of the cross-sectional structure of the device of the present application;

[0027] Figure 3 is a part structure section view schematic diagram of the utility model;

[0028] Figure 4 is a device appearance structure schematic diagram of the utility model. DETAILED DESCRIPTION

[0029] In order to make above-mentioned purpose, feature and advantage of the utility model more apparent, below, specific embodiment of the utility model is explained in detail with the attached drawings of the specification.

[0030] In the following description, a lot of specific details are set forth in order to fully understand the utility model, but the utility model can also be implemented in other ways different from the description herein, and the person skilled in the art can make similar generalization without departing from the connotation of the utility model, therefore, the utility model is not limited by the following disclosed specific embodiments.

[0031] Secondly, the utility model is described in detail in combination with the schematic diagram, in order to facilitate explanation, the section view of the device structure will be partially enlarged without general proportion when detailing the utility model embodiment, and the schematic diagram is only an example, which should not limit the scope of protection of the utility model herein. In addition, three-dimensional spatial dimensions of length, width and depth should be contained in actual manufacture.

[0032] Thirdly, the "one embodiment" or "embodiment" referred to here means that specific features, structures or characteristics can be contained in at least one implementation of the utility model. "In one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is the embodiment that is separate or selectively excluded from other embodiments.

[0033] Embodiment 1

[0034] Referring to Figures 1-4 Fig. 1, a kind of methyl salicylate preparation esterification reaction device, including container 1, the upper end of the container 1 has upper cover 2, further including the stirrer connected in upper cover 2.

[0035] The stirrer includes the stirring head that extends into container 1, the stirring head is provided with a center shaft 3, the center shaft 3 passes through the upper cover 2 and extends into container 1;

[0036] The stirring head is also provided with stirring frame 4, the stirring frame 4 is connected to the center shaft 3, and the stirring frame 4 is arranged in the container 1;

[0037] The center shaft 3 is also sleeved with a disc that slides up and down, called stirring disc 5, the stirring disc 5 is in sliding fit with the center shaft 3, and the stirring disc 5 has a distance from the edge of stirring frame 4.

[0038] The central shaft 3 has a hollow channel coinciding with the axis of the central shaft 3, and a slider 6 sliding up and down is arranged in the channel;

[0039] A magnet, referred to as a driving magnet, is arranged in the slider 6;

[0040] Another magnet, referred to as a driven magnet, is arranged in the stirring disc 5;

[0041] The driving magnet on the slider 6 is oppositely arranged with the driven magnet of the stirring disc 5, and the driving magnet and the driven magnet are magnetically attracted;

[0042] A reciprocating driving mechanism reciprocating up and down is further arranged in the channel to drive the slider to reciprocate up and down.

[0043] Firstly, the stirring frame 4 of the stirrer can transversely stir the mixture of methyl salicylate when the esterification reaction is carried out, so as to improve the reaction speed and stir the mixed reaction more uniformly; secondly, the stirring disc 5 sliding up and down can be stirred by the stirring frame 4, so as to disperse and mix the layered reactants, and the up and down stirring of the stirring disc 5 in combination with the transverse stirring of the stirring frame 4 can avoid the stirring from being divided into several parts or vortex dead angle, so as to improve the mixing effect; finally, the stirring disc 5 is driven by the driving magnet and the driven magnet, the magnetic transmission can make the central shaft 3 smooth and sealed, which is especially suitable for long-term stable operation in an acidic catalyst and a heating environment, the magnetic driving reduces mechanical wear parts, prolongs the service life of the equipment and reduces the maintenance frequency.

[0044] The reciprocating driving mechanism comprises a threaded rod 7 which is inserted into the channel; the slider 6 is provided with a threaded hole which is threadedly matched with the threaded rod 7; a strip-shaped groove is arranged in the channel and extends along the center line of the channel; the slider 6 is provided with an outward extending structure which extends into the strip-shaped groove and is slidably matched with the strip-shaped groove. By rotating the threaded rod 7, the strip-shaped groove clamps the slider 6, and the threaded rod 7 rotates to drive the slider 6 to slide up and down, thereby driving the stirring disc 5 to move up and down, and the threaded transmission makes the slider 6 have enough power to ensure that the stirring disc 5 stably operates in a high-concentration mixture with a certain viscosity.

[0045] A containing cavity is further arranged in the central shaft 3, the containing cavity is arranged above the channel and communicates with the channel; the reciprocating driving mechanism has a bidirectional motor 8 which is arranged in the containing cavity, a driving shaft of the bidirectional motor 8 is connected with the threaded rod 7, and the driving shaft drives the threaded rod 7 to rotate. By arranging the bidirectional motor 8, the threaded rod 7 can rotate forward and backward, so as to ensure that the stirring disc 5 stably operates up and down.

[0046] Two commutating switches 9 are arranged in the channel to switch the direction of the bidirectional motor 8, and the two commutating switches 9 are arranged on the upper and lower sides of the slider 6 respectively, and the triggering structures of the commutating switches 9 are all directed to the slider 6. The bidirectional motor 8 triggers the commutating switches 9 by the up and down movement of the slider 6, so that the reciprocating driving mechanism drives the slider 6 to move up and down simply and reliably.

[0047] When the methyl salicylate is added into the container 1 for esterification reaction, the stirring frame 4 can stir the mixture horizontally, and when the stirring frame 4 rotates to stir, the bidirectional motor 8 drives the threaded rod 7 to rotate periodically in the forward and reverse directions, drives the slider 6 to slide up and down, the active magnet on the slider 6 drives the passive magnet on the stirring disc 5, and the stirring disc 5 slides up and down, and the stirring disc 5 which slides up and down can be stirred by the stirring frame 4, so that the layered reactants can be dispersed and stirred, and the stirring disc 5 is stirred up and down, which is combined with the horizontal stirring of the stirring frame 4, so that the stirring is avoided to be separated or to have a vortex dead angle, and the mixing effect is improved.

[0048] Embodiment 2

[0049] Reference Figure 2 and Figure 3 This is the second embodiment of the utility model, and the embodiment is based on the previous embodiment.

[0050] Two baffle rings 31 made of perfluoroether rubber are arranged on the central shaft 3, the baffle rings 31 are arranged on the upper and lower sides of the stirring disc 5 respectively, and the distance between the two baffle rings 31 forms the stroke of the stirring disc 5 in the up and down movement. The stirring disc 5 is prevented from colliding to the stirring frame 4 when the stirring disc 5 moves up and down too high or too low, so that the stable and reliable operation of the device is ensured, the perfluoroether rubber can resist concentrated sulfuric acid, toluene and other strong corrosive media and can resist a temperature of at least 300 degrees, and is suitable for long-term stable operation in the methyl salicylate preparation esterification reaction device.

[0051] The stirring disc 5 is arranged with stirring blades 41. When the stirring blades 41 slide up and down with the stirring disc 5, the stirring blades 41 can forcibly disperse the layered liquid surface (such as water phase and organic phase separation) formed due to the density difference, so that the salicylic acid and the methanol are fully contacted, the side reaction is reduced, and the ester conversion rate is improved.

[0052] The central shaft 3 is made of 316L stainless steel. The 316L stainless steel is resistant to high temperature and acid corrosion and has no magnetism, so that the long-term stable operation is ensured, and the magnetism between the active magnet and the passive magnet is not affected.

[0053] The stirring frame 4 is provided with stirring blades, which are 10-20 cm away from the stirring disc 5. The up-and-down stirring of the stirring disc 5 does not affect the transverse rotary stirring of the stirring frame 4, improving the safety and reliability of the device operation.

[0054] The hole of the stirring disc 5 matched with the central shaft 3 is a circular hole, and the passive magnets are arranged in the side wall of the circular hole in at least 6 groups. The slider 6 is a cylindrical slider 6, and the active magnets are arranged in the side wall of the outer circumference of the slider 6 in at least 6 groups. The at least 6 passive magnets and the at least 6 active magnets are arranged in one-to-one correspondence. The active magnets and the passive magnets are arranged in one-to-one correspondence and in at least 6 groups, which can form a symmetrical magnetic field distribution, reduce torque fluctuation caused by local magnetic force unevenness, ensure the synchronous movement of the disc and the slider 6, and reduce the friction on the central shaft 3.

[0055] In use, the central shaft 3 is provided with two fluorinated ether rubber material retaining rings 31 to prevent the stirring disc 5 from colliding with the stirring frame 4 when moving too high or too low, ensuring the stable and reliable operation of the device. The stirring blades 41 will rotate with the central shaft 3 when sliding up and down with the stirring disc 5, which can forcibly break the stratified liquid surface formed due to density difference. The active magnets and the passive magnets are arranged in at least 6 groups, which can form a symmetrical magnetic field distribution, reduce torque fluctuation caused by local magnetic force unevenness, ensure the synchronous movement of the disc and the slider 6, and reduce the friction on the central shaft 3.

[0056] In addition, in order to provide a brief description of the exemplary embodiments, all the features of the actual embodiments can not be described, those features that are not related to the currently considered best mode of carrying out the present application, or those features that are not related to the implementation of the present application.

[0057] It should be understood that, in the development of any actual implementation, numerous implementation-specific decisions can be made. Such development efforts, while possibly complex and time-consuming, would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.

[0058] It should be noted that the above examples are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A device for esterification reaction of methyl salicylate preparation comprising a container, the upper end of which has an upper cover, further comprising a stirrer connected to the upper cover, characterized in that: The stirrer comprises a stirring head extending into the container, the stirring head is provided with a central shaft, the central shaft extends into the container through the upper cover; The stirring head is further provided with a stirring frame, the stirring frame is connected to the central shaft, and the stirring frame is arranged in the container; The central shaft is further sleeved with a disc sliding up and down, referred to as a stirring disc, the stirring disc is in sliding fit with the central shaft, and the stirring disc has a distance from the edge of the stirring frame; The central shaft has a hollow channel coinciding with the axis of the central shaft, and a slider sliding up and down is arranged in the channel; The slider is provided with a magnet, referred to as a driving magnet; Another magnet, referred to as a driven magnet, is arranged in the stirring disc; The driving magnet on the slider and the driven magnet on the stirring disc are oppositely arranged, and the driving magnet and the driven magnet are magnetically attracted to each other; The channel is further provided with a reciprocating driving mechanism for driving the slider to reciprocate up and down.

2. The device for preparing esterification reaction of methyl salicylate according to claim 1, characterized in that: The reciprocating driving mechanism comprises a threaded rod, and the threaded rod is arranged in the channel in a penetrating manner; The slider is provided with a threaded hole, and the threaded hole is in threaded fit with the threaded rod; The channel is provided with a strip-shaped groove extending along the center line of the channel; The slider is provided with an outward extending structure, the outward extending structure extends into the strip-shaped groove, and the outward extending structure is in sliding fit with the strip-shaped groove.

3. The device for preparing esterification reaction of methyl salicylate according to claim 2, characterized in that: The central shaft is further provided with a receiving cavity arranged above the channel and in communication with the channel; The reciprocating driving mechanism comprises a bidirectional motor, the bidirectional motor is arranged in the receiving cavity, a driving shaft of the bidirectional motor is connected with the threaded rod, and the driving shaft drives the threaded rod to rotate.

4. The device for preparing esterification reaction of methyl salicylate according to claim 3, characterized in that: The channel is further provided with two reversing switches for switching the direction of the bidirectional motor, the two reversing switches are respectively arranged on the upper side and the lower side of the slider, and the triggering structures of the reversing switches are all directed towards the slider.

5. The device for preparing esterification reaction of methyl salicylate according to claim 1, characterized in that: The central shaft is provided with two fluorinated ether rubber material retaining rings, the retaining rings are respectively arranged on the upper side and the lower side of the stirring disc, and the distance between the two retaining rings forms the stroke of the stirring disc moving up and down.

6. The device for preparing esterification reaction of methyl salicylate according to claim 1, characterized in that: The stirring disc is arranged with stirring blades.

7. The device for preparing esterification reaction of methyl salicylate according to claim 1, characterized in that: The central shaft is made of 316L stainless steel.

8. The device for preparing esterification reaction of methyl salicylate according to claim 1, characterized by: The stirring frame is provided with stirring blades, and the stirring blades have a distance of 10-20 cm from the stirring disc.

9. The device for preparing esterification reaction of methyl salicylate according to claim 1, characterized by: The hole for matching the stirring disc and the central shaft is a circular hole, and the driven magnet is arranged in the sidewall of the circular hole in at least six uniform arrangements; The slider is a cylindrical slider, and the driving magnet is arranged in the sidewall of the outer circumference of the slider in at least six uniform arrangements; The at least six driven magnets and the at least six driving magnets are arranged in one-to-one correspondence.

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