A crystallization device for producing m-toluic acid

Abstract

The invention relates to the technical field of m-methylbenzoic acid processing equipment, and specifically discloses a crystallization device for m-methylbenzoic acid production, comprising a condensation crystallization mechanism, a filtering mechanism is arranged below the condensation crystallization mechanism, the condensation crystallization mechanism comprises a first bracket, the inner upper end of the first bracket is connected with a crystallization tank, the crystallization tank comprises an inner tank and an outer shell, the outer side of the inner tank is detachably connected with the outer shell, the filtering mechanism comprises a filtering bucket, the outer upper end of the filtering bucket is connected with a ring gear, one side of the ring gear is connected with a driving gear, the lower side of the driving gear is connected with a second motor, a water storage tank is arranged outside the filtering bucket, and an annular groove is arranged at the top of the water storage tank. The device is convenient for installation, cleaning and maintenance of relevant components in the condensation crystallization mechanism and the filtering mechanism, has the function of rotating the filtering bucket, can ensure that the m-methylbenzoic acid crystals are fully separated from the residual liquid, and ensure the crystallization and separation quality of the m-methylbenzoic acid.

Description

Technical Field

[0001] The invention relates to the technical field of m-toluic acid processing equipment, and specifically discloses a crystallization device for m-toluic acid production. Background Art

[0003] The Chinese patent with patent number CN220779073U discloses a crystallization and separation device for m-toluic acid, comprising a tank body, a spiral water circulation device is provided on the tank body, a fixed filter disc device is fixedly installed in the tank body, a rotating filter disc device is rotatably connected to the fixed filter disc device, the rotating filter disc device is in sliding sealing contact with the fixed filter disc device, a cover plate is fixedly installed on the tank body, a driving motor is provided at the center of the cover plate, a stirring device is connected to the lower end of the driving motor, a feed port is provided on the cover plate, and a liquid discharge device is provided at the lower part of the side wall of the tank body, and the cooling crystallization and separation of the hot solution of m-toluic acid are realized by the mutual cooperation of the stirring device, the fixed filter disc device and the rotating filter disc device. The process is completed at one time, which ensures that the temperature is constant during the separation process, reduces the adverse effects of temperature changes, saves space, and improves production efficiency. However, the above-mentioned crystallization and separation device is not convenient for assembling, cleaning and maintaining the relevant components in the inner wall of the tank body, the fixed filter disc device and the rotating filter disc device. During the use of the above-mentioned crystallization and separation device, since the fixed filter disc device is fixedly installed on the inner side of the tank body and does not have the function of rotation, after the meta-toluic acid crystals are completely precipitated, the meta-toluic acid crystals cannot be fully separated from the residual liquid during the filtration process, which affects the crystallization and separation quality of meta-toluic acid to a certain extent. Therefore, in order to solve the above-mentioned problems, the present invention proposes a crystallization device for the production of meta-toluic acid. Summary of the invention

[0004] The present invention aims to provide a crystallization device for the production of meta-toluic acid, which is convenient for the installation, cleaning and maintenance of relevant components in the condensation crystallization mechanism and the filtering mechanism, has the function of rotating the filter bucket, can ensure that the meta-toluic acid crystals are fully separated from the residual liquid, and ensure the crystallization and separation quality of the meta-toluic acid.

[0005] The present invention is achieved through the following technical solutions: A crystallization device for producing m-methylbenzoic acid comprises a condensation crystallization mechanism, a filtering mechanism is arranged below the condensation crystallization mechanism, the condensation crystallization mechanism comprises a first bracket, the inner upper end of the first bracket is connected to a crystallization tank, the crystallization tank comprises an inner tank and an outer shell, the outer side of the inner tank is detachably connected to the outer shell, the lower end of the inner tank is connected to a first discharge pipe, the interior of the first discharge pipe is provided with a sealing plate, one end of the sealing plate is connected to a telescopic rod, a cold air blower is arranged on one side of the outer shell, the filtering mechanism comprises a filter bucket, the outer upper end of the filter bucket is connected to a ring gear, a plurality of arc plates distributed in a circular array are connected below the ring gear, a driving gear is connected to one side of the ring gear, a second motor is connected below the driving gear, a water storage tank is arranged on the outer side of the filter bucket, an annular groove is arranged at the top of the water storage tank, and the annular groove is slidably connected to the arc plate.

[0006] As a further arrangement of the above scheme, a condensing water pipe is spirally wound around the outer side of the inner tank, and the upper and lower ends of the condensing water pipe are respectively connected to a return pipe and a water supply pipe, the lower end of the water supply pipe is connected to a water pump, and the lower end of the water pump is connected to a chiller, and the end of the return water pipe away from the condensing water pipe is connected to the chiller, so as to facilitate the injection of low-temperature cold water into the condensing water pipe to cool the inner tank and the high-temperature hot melt liquid inside it, thereby laying the foundation for the precipitation of crystals of m-toluic acid.

[0007] As a further configuration of the above scheme, the upper and lower ends of the outer shell are respectively connected to an exhaust pipe and an air inlet pipe, one end of the exhaust pipe is provided with a first valve, and the air inlet pipe is connected to the air outlet end of the air cooler, which can keep the outer wall of the inner tank, the inner wall of the outer shell and the outside of the condensate pipe dry; a second bracket is connected to the outside of the air cooler, and the second bracket is connected to the outer shell, which can provide stable support for the air cooler and facilitate the installation and maintenance of the air cooler.

[0008] As a further configuration of the above scheme, the upper end of the shell is connected to a top plate, a stirring rod is provided through the middle of the top plate and is rotatably connected to the stirring rod, the lower end of the stirring rod is rotatably connected to a support plate, the end of the support plate away from the stirring rod is connected to the inner tank, both sides of the stirring rod are connected to a first scraper, the upper end of the stirring rod is connected to a first motor, which can drive the stirring rod and the first scraper to rotate through the motor, thereby increasing the cooling of the hot melt and the precipitation speed of m-toluic acid, and scraping off the m-toluic acid crystals adhering to the inner wall of the inner tank, the outer side of the first motor is connected to a first base, which can provide stable support for the first motor, and one side of the first motor is provided with a feed pipe, which is convenient for injecting high-temperature and high-concentration m-toluic acid solution into the inner tank of the crystallization tank.

[0009] As a further configuration of the above scheme, a through hole is provided on one side of the first discharge pipe, and limiting grooves are provided on both sides inside the first discharge pipe. The sealing plate runs through the inside of the through hole, and the two sides of the sealing plate are respectively slidably connected to the two limiting grooves. The sealing plate is detachably connected to the telescopic end of the telescopic rod, and can seal the first discharge pipe during the crystallization process to prevent the outflow of the m-toluic acid solution. After the crystallization is completed, the sealing plate is pulled out of the through hole to a certain depth through the contraction of the telescopic rod, and the m-toluic acid crystals and liquid are discharged into the filtering mechanism together. The outer side of the telescopic rod is connected to the first bracket, which can provide stable support for the telescopic rod.

[0010] As a further configuration of the above scheme, a plurality of filter holes are provided on the side wall of the filter bucket to facilitate the separation of the liquid and the meta-methylbenzoic acid crystals; a second discharge pipe is connected to the lower end of the filter bucket; the outer side of the second discharge pipe is rotatably connected to the water storage tank, which can provide further support for the filter bucket while facilitating the rotation of the filter bucket; a second valve is connected to the end of the second discharge pipe away from the filter bucket; a second scraper is provided on the inner side of the filter bucket; the upper end of the second scraper is detachably connected to the first discharge pipe, which facilitates the installation and maintenance of the second scraper and can prevent meta-methylbenzoic acid from sticking to the inner wall of the filter bucket.

[0011] As a further configuration of the above scheme, the teeth of the ring gear and the driving gear are meshing, the upper end of the driving gear is connected to a support shaft, the outer side of the support shaft is rotatably connected to a connecting plate, one end of the connecting plate is connected to the first bracket, the outer side of the second motor is connected to a second machine base, the second machine base is connected to a water storage tank at one end away from the second motor, and the second motor can be rotated to drive the driving gear to rotate, thereby driving the ring gear and the filter bucket to rotate, and under the action of centrifugal force, the crystallization of meta-toluic acid in the filter bucket and the separation of residual liquid in the crystallization are accelerated, thereby improving the crystallization efficiency of meta-toluic acid.

[0012] As a further arrangement of the above scheme, the outer side of the water tank is detachably connected to the first bracket, which is convenient for assembly and maintenance of the water tank and the filtering mechanism. A drain pipe is provided on one side of the water tank to facilitate discharge of liquid. The first protective cover and the second protective cover are respectively connected to both sides of the upper end of the water tank, so that a relatively sealed space can be formed between the water tank and the two protective covers to ensure the neatness of the crystals of m-toluic acid inside the filtering mechanism. A notch is provided in the middle of the second protective cover to facilitate the connection between the driving gear and the ring gear, providing space for the rotation of the driving gear.

[0013] As a further configuration of the above solution, a controller is provided on one side of the first bracket to facilitate controlling the operation of relevant components in the device.

[0014] Before use, inject sufficient clean water into the chiller, inject sufficient high-temperature, high-concentration m-toluic acid solution into the inner tank of the crystallization tank through the feed pipe, use the controller to start the first motor, so that the first motor drives the stirring rod and the first scraper to rotate, use the controller to start the water pump, the chiller and the cold air blower to cool the inner tank and the hot melt inside. During the rotation of the first scraper, the crystals adhering to the inner wall of the inner tank are scraped off. After a period of time, the precipitation of m-toluic acid crystals is completed, and the controller is used to control the contraction of the telescopic rod to pull the sealing plate out of the through hole to a certain depth. The meta-toluic acid crystals in the crystallization tank flow together with the liquid through the first discharge pipe to the filter bucket in the filtering mechanism for filtration. The second motor is started by a controller so that the second motor drives the ring gear and the filter bucket to rotate slowly through the driving gear, so that the meta-toluic acid crystals and the residual liquid in the filter bucket are accelerated to separate under the action of centrifugal force. After the separation is completed, the second valve is opened to discharge the meta-toluic acid crystals from the second discharge pipe. The second scraper that remains stationary can scrape off the crystals adhered to the inner wall of the rotating filter bucket, thereby ensuring the crystallization yield and efficiency of the meta-toluic acid.

[0015] The present invention has the following beneficial effects in practical application: The combined use of the air cooler and the cold water tank in the condensation crystallization mechanism allows the device to flexibly select air cooling or water cooling as needed during actual use, and the air cooler can keep the outer wall of the inner tank, the inner wall of the outer shell and the outside of the condensate pipe dry during use, avoiding the accumulation of condensate in the cavity between the inner tank and the outer shell, thereby reducing the maintenance time of the above components.

[0016] The detachable connection between the filtering mechanism and the condensation crystallization mechanism facilitates the cleaning and maintenance of the various components of the above two mechanisms. The combination of the arc plate and the annular groove can provide support for the filter bucket while limiting the position of the filter bucket. The combination of the ring gear, the driving gear and the second motor can drive the driving gear to rotate through the rotation of the second motor, thereby driving the ring gear and the filter bucket to rotate, so that the filter bucket and the m-toluic acid crystals inside it and the liquid remaining inside the crystals can be rotated slowly, and the separation speed and separation quality of the liquid and m-toluic acid crystals can be accelerated by means of centrifugal force, thereby ensuring the efficiency and quality of the preparation of m-toluic acid crystals. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 It is a perspective schematic diagram of the present invention; Figure 2 It is a front perspective schematic diagram of the present invention; Figure 3 It is a perspective schematic diagram of the combination of the inner container and the first discharge pipe in the present invention; Figure 4 It is a perspective schematic diagram of the combination of the housing and the air cooler in the present invention; Figure 5 It is a perspective schematic diagram of the combination of the condensing water pipe, the water pump and the chiller in the present invention; Figure 6 It is a perspective schematic diagram of the combination of the sealing plate and the telescopic rod in the present invention; Figure 7 It is a perspective schematic diagram of the combination of the top plate, the stirring rod and the first motor in the present invention; Figure 8 It is an exploded perspective schematic diagram of the filtering mechanism in the present invention; Fig. 9 It is a perspective schematic diagram of the combination of the filter bucket and the second scraper in the present invention; Fig.10 It is a perspective schematic diagram of the ring gear in the present invention.

[0019] In the figure: 1, condensation crystallization mechanism; 2, filtering mechanism; 3, controller; 11, first bracket; 12, crystallization tank; 121, liner; 122, shell; 123, condensation water pipe; 1231, return pipe; 1232, water pipe; 124, exhaust pipe; 125, first valve; 126, air inlet pipe; 127, top plate; 1271, feed pipe; 128, first discharge pipe; 1281, through hole; 1282, limit groove; 13, sealing plate; 131, telescopic rod; 14, water pump; 15, chiller; 16, air cooler; 161, second Bracket; 17, stirring rod; 171, first scraper; 172, support plate; 18, first motor; 181, first base; 21, filter bucket; 211, filter hole; 212, second discharge pipe; 213, second valve; 22, second scraper; 23, ring gear; 231, arc plate; 24, driving gear; 241, support shaft; 242, connecting plate; 25, second motor; 251, second base; 26, water storage tank; 261, drain pipe; 262, ring groove; 27, first protective cover; 28, second protective cover; 281, notch. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Figures 1 to 10 , and describes the application in detail with reference to embodiments.

[0022] The embodiment discloses a crystallization device for producing m-toluic acid, comprising a condensation crystallization mechanism 1, a filtering mechanism 2 is arranged below the condensation crystallization mechanism 1, the condensation crystallization mechanism 1 comprises a first bracket 11, the upper end of the interior of the first bracket 11 is connected to a crystallization tank 12, the crystallization tank 12 comprises an inner liner 121 and an outer shell 122, the outer side of the inner liner 121 is detachably connected to the outer shell 122, the lower end of the inner liner 121 is connected to a first discharge pipe 128, the interior of the first discharge pipe 128 is provided with a sealing plate 13, one end of the sealing plate 13 is connected to a telescopic Rod 131, a cold air blower 16 is arranged on one side of the shell 122, the filtering mechanism 2 includes a filtering bucket 21, a ring gear 23 is connected to the upper end of the outer side of the filtering bucket 21, a plurality of arc plates 231 distributed in a circular array are connected below the ring gear 23, a driving gear 24 is connected to one side of the ring gear 23, a second motor 25 is connected below the driving gear 24, a water storage tank 26 is arranged on the outer side of the filtering bucket 21, a ring groove 262 is arranged on the top of the water storage tank 26, and the ring groove 262 is slidably connected to the arc plate 231.

[0023] like Figure 2 and Figure 5 As shown, a condensing water pipe 123 is spirally wound around the outer side of the inner tank 121, and the upper and lower ends of the condensing water pipe 123 are respectively connected to a return water pipe 1231 and a water supply pipe 1232, and the lower end of the water supply pipe 1232 is connected to a water pump 14, and the lower end of the water pump 14 is connected to a chiller 15. The end of the return water pipe 1231 away from the condensing water pipe 123 is connected to the chiller 15, so as to facilitate the injection of low-temperature cold water into the condensing water pipe 123 to cool the inner tank 121 and the high-temperature hot melt liquid inside it, thereby laying a foundation for the precipitation of crystals of m-toluic acid.

[0024] like Figure 1 , Figure 2 and Figure 4As shown, the upper and lower ends of the outer shell 122 are respectively connected to an exhaust pipe 124 and an air inlet pipe 126, one end of the exhaust pipe 124 is provided with a first valve 125, and the air inlet pipe 126 is connected to the air outlet end of the air cooler 16, which can keep the outer wall of the inner tank 121, the inner wall of the outer shell 122 and the outside of the condensate pipe 123 dry, and the outer side of the air cooler 16 is connected to a second bracket 161, and the second bracket 161 is connected to the outer side of the air cooler 16, which can provide stable support for the air cooler 16 and facilitate the installation and maintenance of the air cooler 16.

[0025] like Figure 1 , Figure 2 and Figure 7 As shown, the upper end of the shell 122 is connected to a top plate 127, a stirring rod 17 is provided through the middle of the top plate 127 and is rotatably connected to the stirring rod 17, the lower end of the stirring rod 17 is rotatably connected to a support plate 172, the end of the support plate 172 away from the stirring rod 17 is connected to the inner liner 121, both sides of the stirring rod 17 are connected to a first scraper 171, the upper end of the stirring rod 17 is connected to a first motor 18, which can drive the stirring rod 17 and the first scraper 171 to rotate through the motor, thereby increasing the cooling of the hot melt and the precipitation speed of m-toluic acid, and scraping off the m-toluic acid crystals adhering to the inner wall of the inner liner 121, the outer side of the first motor 18 is connected to a first machine base 181, which can provide stable support for the first motor 18, and one side of the first motor 18 is provided with a feeding pipe 1271, which is convenient for injecting a high-temperature, high-concentration m-toluic acid solution into the inner liner 121 of the crystallization tank 12.

[0026] like Figure 1 , Figure 2 , Figure 3 and Figure 6 As shown, a through hole 1281 is provided on one side of the first discharge pipe 128, and limiting grooves 1282 are provided on both sides of the inside of the first discharge pipe 128, the sealing plate 13 passes through the inside of the through hole 1281, and the two sides of the sealing plate 13 are respectively slidably connected to the two limiting grooves 1282, and the sealing plate 13 is detachably connected to the telescopic end of the telescopic rod 131, so that the first discharge pipe 128 can be sealed during the crystallization process to prevent the outflow of the m-toluic acid solution, and after the crystallization is completed, the sealing plate 13 is pulled out of the through hole 1281 to a certain depth through the contraction of the telescopic rod 131, and the m-toluic acid crystals and liquid are discharged into the filtering mechanism 2 together, and the outer side of the telescopic rod 131 is connected to the first bracket 11, which can provide stable support for the telescopic rod 131.

[0027] like Figure 2 , Figure 8 and Fig. 9As shown, the side wall of the filter bucket 21 is provided with a plurality of filter holes 211, which are convenient for the separation of liquid and m-methylbenzoic acid crystals. The lower end of the filter bucket 21 is connected with a second discharge pipe 212, and the outer side of the second discharge pipe 212 is rotatably connected to the water storage tank 26, which can provide further support for the filter bucket 21 while facilitating the rotation of the filter bucket 21. The end of the second discharge pipe 212 away from the filter bucket 21 is connected with a second valve 213, and the inner side of the filter bucket 21 is provided with a second scraper 22, and the upper end of the second scraper 22 is detachably connected to the first discharge pipe 128, which is convenient for the installation and maintenance of the second scraper 22 and can prevent m-methylbenzoic acid from sticking to the inner wall of the filter bucket 21.

[0028] like Figure 2 , Figure 8 and Fig.10 As shown, the gear teeth of the ring gear 23 and the driving gear 24 are meshed, the upper end of the driving gear 24 is connected to a support shaft 241, the outer side of the support shaft 241 is rotatably connected to a connecting plate 242, one end of the connecting plate 242 is connected to the first bracket 11, the outer side of the second motor 25 is connected to a second machine base 251, the second machine base 251 is connected to the water tank 26 at one end away from the second motor 25, and the second motor 25 can drive the driving gear 24 to rotate by rotating, thereby driving the ring gear 23 and the filter bucket 21 to rotate, and under the action of centrifugal force, the crystallization of m-toluic acid in the filter bucket 21 and the separation speed of the residual liquid in the crystallization are accelerated, thereby improving the crystallization efficiency of m-toluic acid.

[0029] like Figure 1 and Figure 8 As shown, the outer side of the water tank 26 is detachably connected to the first bracket 11, which is convenient for the assembly and maintenance of the water tank 26 and the filtering mechanism 2. A drain pipe 261 is provided on one side of the water tank 26 to facilitate the discharge of liquid. The first protective cover 27 and the second protective cover 28 are respectively connected to the upper ends of the water tank 26. A relatively sealed space can be formed between the water tank 26 and the two protective covers to ensure the neatness of the crystals of m-toluic acid inside the filtering mechanism 2. A notch 281 is provided in the middle of the second protective cover 28 to facilitate the connection between the driving gear 24 and the ring gear 23 and provide space for the rotation of the driving gear 24.

[0030] like Figure 1 and Figure 2 As shown, a controller 3 is provided on one side of the first bracket 11 to facilitate controlling the operation of relevant components in the device.

[0031] The crystallization device for producing m-toluic acid disclosed in this embodiment is as follows: before use, a sufficient amount of clean water is injected into the chiller 15, a sufficient amount of high-temperature, high-concentration m-toluic acid solution is injected into the inner tank 121 of the crystallization tank 12 through the feed pipe 1271, the first motor 18 is started by the controller 3, the first motor 18 drives the stirring rod 17 and the first scraper 171 to rotate, the water pump 14 and the chiller 15 are started by the controller 3, cold water is injected into the condensation water pipe 123, the cold water flows through the condensation water pipe 123 to reduce the temperature of the condensation water pipe 123, and absorbs the heat of the inner tank 121 and then heats up. , lower the temperature of the inner tank 121 and the meta-toluic acid hot melt inside it, so that the meta-toluic acid crystals are precipitated, use the controller 3 to start the air cooler 16, open the first valve 125, and allow the air cooler 16 to inject low-temperature air into the cavity formed between the inner tank 121 and the outer shell 122, thereby improving the cooling efficiency of the inner tank 121 while keeping the outer wall of the condensation water pipe 123 dry. During the rotation of the first scraper 171, the crystals adhered to the inner wall of the inner tank 121 are scraped off, and the heated cold water flows back to the chiller 15 through the return pipe 1231 for cooling, so as to realize the recycling of water.

[0032] After a period of time, the precipitation of m-toluic acid crystals is completed, and the controller 3 is used to turn off the first motor 18, and the original sewage pipe is connected to the drain pipe 261. The controller 3 is used to control the contraction of the telescopic rod 131, and the sealing plate 13 is pulled out of the through hole 1281 to a certain depth, so that the m-toluic acid crystals in the crystallizer 12 together with the liquid flow through the first discharge pipe 128 to the filter bucket 21 in the filter mechanism 2 for filtration. The liquid falls into the water storage tank 26 through the filter hole 211 and is discharged from the water storage tank 26 through the drain pipe 261. The liquid flow in the drain pipe 261 is observed. When the flow rate drops significantly, the controller is used to The second motor 25 is started, and the second motor 25 drives the ring gear 23 to rotate through the driving gear 24, so that the arc plate 231 rotates in the annular groove 262, thereby driving the filter bucket 21 to rotate slowly, so that the meta-methylbenzoic acid crystals and the residual liquid in the filter bucket 21 are separated faster under the action of centrifugal force, and the quality of separation of crystals and liquid is improved. After the separation is completed, the second valve 213 is opened to discharge the meta-methylbenzoic acid crystals from the second discharge pipe 212, and the second scraper 22 that remains stationary can scrape off the crystals adhered to the inner wall of the rotating filter bucket 21, so as to ensure the crystallization yield and efficiency of the meta-methylbenzoic acid.

[0033] The present invention discloses a controller 3, a first bracket 11, a crystallization tank 12, an inner tank 121, a shell 122, a condensation water pipe 123, a return pipe 1231, a water pipe 1232, an exhaust pipe 124, a first valve 125, an air inlet pipe 126, a top plate 127, a feed pipe 1271, a first discharge pipe 128, a sealing plate 13, a telescopic rod 131, a water pump 14, a chiller 15, a cooling fan 16, a second bracket 161; a stirring rod 17, a first scraper 171, a first Components such as a motor 18, a first base 181, a filter bucket 21, a second discharge pipe 212, a second valve 213, a ring gear 23, an arc plate 231, a driving gear 24, a support shaft 241, a connecting plate 242, a second motor 25, a second base 251, a water storage tank 26, a drain pipe 261, a first protective cover 27 and a second protective cover 28 are all universal standard parts or parts known to those skilled in the art, and their structures and principles can be learned by those skilled in the art through technical manuals or through conventional experimental methods.

[0034] The above are only preferred embodiments of the present invention and are not intended to limit the invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the invention should be included in the protection scope of the present invention.

Claims

1. A crystallization device for producing m-toluic acid, comprising a condensation crystallization mechanism, characterized in that: A filtering mechanism is arranged below the condensation and crystallization mechanism, and the condensation and crystallization mechanism comprises a first bracket, and the inner upper end of the first bracket is connected to a crystallization tank, and the crystallization tank comprises an inner tank and an outer shell, and the outer side of the inner tank is detachably connected to the outer shell, and the lower end of the inner tank is connected to a first discharge pipe, and the interior of the first discharge pipe is provided with a sealing plate, and one end of the sealing plate is connected to a telescopic rod, and a cold air blower is arranged on one side of the outer shell, and the filtering mechanism comprises a filter bucket, and the outer upper end of the filter bucket is connected to an annular gear, and a plurality of arc plates distributed in a circular array are connected below the annular gear, and a driving gear is connected to one side of the annular gear, and a second motor is connected below the driving gear, and a water storage tank is arranged on the outer side of the filter bucket, and an annular groove is arranged on the top of the water storage tank, and the annular groove is slidably connected to the arc plate.

2. A crystallization device for producing m-toluic acid according to claim 1, characterized in that: A condensing water pipe is spirally wound around the outer side of the inner tank, and the upper and lower ends of the condensing water pipe are respectively connected to a return pipe and a water supply pipe, the lower end of the water supply pipe is connected to a water pump, the lower end of the water pump is connected to a chiller, and the end of the return water pipe away from the condensing water pipe is connected to the chiller.

3. A crystallization device for producing m-toluic acid according to claim 1, characterized in that: The upper and lower ends of the shell are respectively connected with an exhaust pipe and an air inlet pipe, one end of the exhaust pipe is provided with a first valve, the air inlet pipe is connected to the air outlet end of the air cooler, the outer side of the air cooler is connected with a second bracket, and the second bracket is connected to the shell.

4. A crystallization device for producing m-toluic acid according to claim 1, characterized in that: The upper end of the shell is connected to a top plate, a stirring rod is penetrated through the middle of the top plate and is rotatably connected to the stirring rod, the lower end of the stirring rod is rotatably connected to a support plate, one end of the support plate away from the stirring rod is connected to the inner tank, both sides of the stirring rod are connected to a first scraper, the upper end of the stirring rod is connected to a first motor, the outer side of the first motor is connected to a first base, and a feed pipe is provided on one side of the first motor.

5. A crystallization device for producing m-toluic acid according to claim 1, characterized in that: A through hole is provided on one side of the first discharge pipe, and limiting grooves are provided on both sides inside the first discharge pipe. The sealing plate passes through the inside of the through hole, and the two sides of the sealing plate are slidably connected to the two limiting grooves respectively. The sealing plate is detachably connected to the telescopic end of the telescopic rod, and the outer side of the telescopic rod is connected to the first bracket.

6. A crystallization device for producing m-toluic acid according to claim 1, characterized in that: The side wall of the filter bucket is provided with multiple filter holes, the lower end of the filter bucket is connected to a second discharge pipe, the outer side of the second discharge pipe is rotatably connected to the water storage tank, the end of the second discharge pipe away from the filter bucket is connected to a second valve, and the inner side of the filter bucket is provided with a second scraper, and the upper end of the second scraper is detachably connected to the first discharge pipe.

7. A crystallization device for producing m-toluic acid according to claim 1, characterized in that: The teeth of the ring gear and the driving gear are meshed, the upper end of the driving gear is connected to a support shaft, the outer side of the support shaft is rotatably connected to a connecting plate, one end of the connecting plate is connected to the first bracket, the outer side of the second motor is connected to a second base, and the second base is connected to a water tank at one end away from the second motor.

8. A crystallization device for producing m-toluic acid according to claim 1, characterized in that: The outer side of the water tank is detachably connected to the first bracket, a drainage pipe is arranged on one side of the water tank, a first protective cover and a second protective cover are respectively connected to both sides of the upper end of the water tank, and a notch is arranged in the middle of the second protective cover.

9. A crystallization device for producing m-toluic acid according to claim 1, characterized in that: A controller is disposed on one side of the first bracket.

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