Methyl tetrahydrophthalic anhydride continuous isomerization process and device

Abstract

The invention discloses a continuous isomerization process and device for methyl tetrahydrophthalic anhydride, and relates to the technical field of chemical production. The device comprises a processing tank, a feeding port is formed in the outer wall of the processing tank in a penetrating mode, a first one-way valve is fixedly connected to the feeding port, a stirring assembly is installed in the processing tank, and a discharging port is formed in one side of the processing tank. According to the device, the adjusting assembly is arranged, a first residual gear and a second residual gear can be driven to rotate together by starting a double-shaft motor to operate, and along with continuous rotation of the first residual gear and the second residual gear, two sawteeth can make contact with and be separated from a rack circularly and continuously; the two extrusion bins are arranged, so that the extrusion plates can enable the dripping speed of C5 and maleic anhydride solutions in the two extrusion bins to be stably controlled, and meanwhile, the dripping speed of the two solutions can be changed by adjusting the rotating speed of the double-shaft motor, so that the uniformity of reaction conditions is improved, and the conversion rate of maleic anhydride and the quality of a final product are effectively increased.

Description

Technical Field

[0001] The present application relates to the field of chemical production technology, and in particular to a continuous isomerization process and device for methyltetrahydrophthalic anhydride. Background Art

[0002] Continuous isomerization of methyltetrahydrophthalic anhydride is an important chemical reaction process, which is mainly used to convert methyltetrahydrophthalic anhydride into more valuable compounds. This process improves the conversion rate and selectivity of the product by controlling the reaction conditions, such as temperature, pressure and the ratio of reactants. With the increasing demand for efficient chemical production, it is particularly important to develop a more efficient continuous isomerization process.

[0003] In the prior art, the continuous isomerization of methyltetrahydrophthalic anhydride generally involves the use of C5 and maleic anhydride solutions as reactants, which are added dropwise to a reactor at a certain ratio and speed through specific equipment. However, the existing methods have challenges in precisely controlling the dropwise addition rate and feed ratio, which limits further improvements in reaction efficiency and product quality.

[0004] Therefore, in the actual process of continuous isomerization process, C5 and maleic anhydride solution are usually added separately by staff. Therefore, this lack of flexibility in adjustment makes the adjustment of the dripping rate and feed ratio of C5 and maleic anhydride solution extremely unstable, which may usually lead to uneven reaction conditions and affect the conversion rate of maleic anhydride and the quality of the final product. For this reason, the present application provides a continuous isomerization process and apparatus for methyltetrahydrophthalic anhydride. Summary of the invention

[0005] The purpose of the present application is to solve the problem that the adjustment of the dripping speed and feed ratio of C5 and maleic anhydride solution is unstable, which may usually lead to uneven reaction conditions and affect the conversion rate of maleic anhydride and the quality of the final product. The present application provides a continuous isomerization process and apparatus for methyltetrahydrophthalic anhydride.

[0006] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions: The invention discloses a continuous isomerization process and device for methyltetrahydrophthalic anhydride, comprising a processing tank, wherein an outer wall of the processing tank is provided with a feed port, a one-way valve is fixedly connected to the feed port, a stirring assembly is installed inside the processing tank, a discharge port is provided on one side of the processing tank, two feeding chambers are symmetrically fixedly connected to the top of the processing tank, a liquid storage tank is fixedly connected to the inside of the two feeding chambers, a liquid inlet is fixedly provided on the top of the liquid storage tank, an extrusion bin is provided inside the two feeding chambers, a feed pipe is fixedly connected to the bottom of the liquid storage tank, one end of the feed pipe away from the liquid storage tank is fixedly connected to the extrusion bin, a discharge pipe is fixedly connected to the bottom of the extrusion bin, a one-way valve is fixedly connected to the discharge pipe, and an adjustment assembly is installed on the top of the two feeding chambers.

[0007] By adopting the above technical scheme, the gas raw material required to participate in the continuous isomerization of methyltetrahydrophthalic anhydride is infused into the interior of the processing tank through the feed port, and the C5 and maleic anhydride solutions are respectively infused into the corresponding liquid storage tanks through the two liquid inlets, then the one-way valve 2 is opened and the regulating component is started to operate, so that the different solutions in the two extrusion bins can be simultaneously dripped into the interior of the processing tank through the guidance of the discharge pipe, and the dripping speed and feed ratio of the C5 and maleic anhydride solutions are stably controlled so that the ratio of C5 and maleic anhydride reaches 1:1.5 as much as possible, thereby improving the uniformity of the reaction conditions, effectively increasing the conversion rate of maleic anhydride and the quality of the final product, when the C5 and maleic anhydride solutions are gradually dripped into the interior of the processing tank, the stirring component can be started to effectively allow the C5 and maleic anhydride solutions to be fully mixed and contacted with the gas raw materials, and the gas-liquid contact time is increased, the gas-liquid mass transfer is strengthened, and the maleic anhydride conversion rate is improved, and finally the gas and liquid that undergo continuous isomerization can be discharged through the discharge port.

[0008] Furthermore, the stirring assembly includes a stirring rod rotatably connected to the inside of the processing tank, the top of the processing tank is fixedly connected to a motor 1, the output end of the motor 1 is fixedly connected to the top of the stirring rod, and a plurality of stirring blades are evenly and fixedly connected to the outer wall of the stirring rod.

[0009] By adopting the above technical solution, multiple stirring blades are continuously rotated inside the processing tank to continuously stir the solution inside the processing tank, so that the C5 and maleic anhydride solution and the gas raw material are effectively fully mixed and contacted to react, and the gas-liquid contact time is increased, the gas-liquid mass transfer is enhanced, and the maleic anhydride conversion rate is improved.

[0010] Furthermore, cleaning plates are slidably provided at both ends of the plurality of stirring blades, grooves are opened at both ends of the plurality of stirring blades, connecting blocks are slidably connected inside the plurality of grooves, springs are fixedly connected inside the plurality of grooves, one end of the spring is fixedly connected to one end of the connecting block, one end of the connecting block away from the spring is fixedly connected to one side of the cleaning plate, and the other side of the cleaning plate is in contact with the inner wall of the processing tank.

[0011] By adopting the above technical solution, through the elastic resistance of the groove, the cleaning plate can be pushed by the connecting block to always fit the inner wall of the processing tank, so that the solution adhering to the inner wall of the processing tank can be scraped off by the cleaning plate, so that the solution can better contact with the gas.

[0012] Furthermore, the adjustment assembly includes fixed frames respectively fixedly connected to the tops of the two feeding chambers, the two fixed frames are slidably connected to the inside of the two fixed frames, multiple springs are fixedly connected to the upper and lower ends of the adjustment plates, the ends of the multiple springs away from the adjustment plates are fixedly connected to the inner wall of the fixed frame, one side of the adjustment plate is symmetrically fixedly connected to two connecting rods, the two fixed frames are slidably connected to the inside of the extrusion plates, the ends of the two connecting rods away from the adjustment plates are fixedly connected to the top of the extrusion plate, and a driving member is provided on one side of the two fixed frames.

[0013] By adopting the above technical solution, the extrusion plate can keep the dripping speed of C5 and maleic anhydride solutions in the two extrusion chambers under stable control through the operation of the driving member, and the dripping speed of the two solutions can also be changed by adjusting the speed of the dual-axis motor.

[0014] Furthermore, both sides of the inner walls of the two fixing frames are provided with sliding grooves, and both sides of the two adjusting plates are fixedly connected with sliding blocks, and the sliding blocks are slidably connected in the sliding grooves.

[0015] By adopting the above technical solution, the two adjustment plates are driven by the driving member to descend inside the two fixing frames under the guidance of the slider.

[0016] Furthermore, the driving member includes two fixed plates fixedly connected to one side of the two fixed frames, and a rotating shaft is rotatably connected in the two fixed plates. A dual-axis motor is fixedly connected to the opposite surfaces of the two rotating shafts, and the output ends of the dual-axis motor are respectively fixedly connected to the two rotating shafts, one of the rotating shafts is symmetrically fixedly connected to two residual gears 1, and the other rotating shaft is symmetrically fixedly connected to two residual gears 2, and one side of the two adjustment plates is symmetrically fixedly connected to a rack, and the two residual gears 1 and the residual gear 2 are both meshingly connected to the rack.

[0017] By adopting the above technical solution, since the two residual gears 1 and 2 are meshed with the rack, they will intermittently contact the rack while rotating, so that the two saw teeth can cyclically and continuously contact and separate from the rack, so that the extrusion plate can keep the dripping acceleration of C5 and maleic anhydride solution inside the two extrusion chambers stable and controlled.

[0018] Furthermore, the number of teeth on the two first broken gears is 1.5 times the number of teeth on the two second broken gears.

[0019] By adopting the above technical solution, during the dropping process, the saw teeth on one of the two residual gears can contact the rack faster, so that the ratio of C5 and maleic anhydride can reach 1:1.5 as much as possible, thereby achieving the stability of the feed ratio.

[0020] The continuous isomerization process of methyltetrahydrophthalic anhydride comprises the following steps: S1: First, the gas raw material to be used for continuous isomerization of methyltetrahydrophthalic anhydride is injected into the processing tank through the feed port, then the one-way valve 1 is closed to seal the feed port to prevent gas leakage, and C5 and maleic anhydride solutions are injected into the corresponding liquid storage tanks through the two liquid inlets respectively; S2: Open the second one-way valve and start the operation of the regulating component, so that the different solutions in the two extrusion chambers can be simultaneously dripped into the processing tank through the discharge pipe, and the dripping speed and feed ratio of C5 and maleic anhydride solution are stably controlled so that the ratio of C5 and maleic anhydride reaches 1:1.5 as much as possible, thereby improving the uniformity of the reaction conditions and effectively increasing the conversion rate of maleic anhydride and the quality of the final product; S3: When C5 and maleic anhydride solution are gradually dripped into the processing tank, the stirring component can be started to effectively allow C5 and maleic anhydride solution to fully mix and contact with the gas raw material, increase the gas-liquid contact time, strengthen the gas-liquid mass transfer, and improve the maleic anhydride conversion rate. Finally, the gas and liquid that are continuously isomerized can be discharged through the discharge port.

[0021] In summary, the present application includes at least one of the following beneficial effects: 1. The present application is provided with an adjustment component, which can drive the two residual gears 1 and 2 to rotate together by starting the operation of the dual-axis motor. As the two residual gears 1 and 2 continue to rotate, the two saw teeth can cyclically and continuously contact and separate from the rack, so that the extrusion plate can keep the dripping speed of the C5 and maleic anhydride solutions in the two extrusion bins stable and controlled. At the same time, the dripping speed of the two solutions can be changed by adjusting the speed of the dual-axis motor, thereby improving the uniformity of the reaction conditions and effectively increasing the conversion rate of maleic anhydride and the quality of the final product.

[0022] 2. In the present application, a residual gear 1 and a residual gear 2 are provided. Since the number of saw teeth on the two residual gears 1 is 1.5 times the number of saw teeth on the two residual gears 2, during the dropwise addition process, the saw teeth on the two residual gears 1 can contact the rack faster, so that the ratio of C5 to maleic anhydride is as close to 1:1.5 as possible, thereby achieving the stability of the feed ratio, improving the uniformity of the reaction conditions, and effectively increasing the conversion rate of maleic anhydride and the quality of the final product.

[0023] 3. The present application is provided with a stirring assembly, and the operation of the stirring assembly can effectively make C and maleic anhydride solution fully mixed and contacted with the gas raw material, increase the gas-liquid contact time, strengthen the gas-liquid mass transfer, and improve the maleic anhydride conversion rate. At the same time, the solution adhering to the inner wall of the processing tank can be scraped off by the cleaning plate, so that the solution can better contact with the gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the device body in this application.

[0025] Figure 2 It is a cross-sectional view of the stirring assembly in this application.

[0026] Figure 3 It is a schematic diagram of the three-dimensional structure of the adjustment component in this application.

[0027] Figure 4 It is a schematic diagram of the internal structure of the feeding chamber in this application.

[0028] Description of reference numerals: 1. Processing tank; 2. Feed inlet; 3. One-way valve 1; 4. Stirring rod; 5. Motor 1; 6. Stirring blade; 7. Cleaning plate; 8. Groove; 9. Connecting block; 10. Spring 1; 11. Discharge port; 12. Feeding chamber; 13. Liquid storage tank; 14. Liquid inlet; 15. Extrusion bin; 16. Feed pipe; 17. Discharge pipe; 18. One-way valve 2; 19. Fixed frame; 20. Adjustment plate; 21. Spring 2; 22. Fixed plate; 23. Rotating shaft; 24. Dual-axis motor; 25. Residual gear 1; 26. Residual gear 2; 27. Rack; 28. Slide; 29. ​​Sliding block; 30. Connecting rod; 31. Extrusion plate. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-4 This application is described in further detail.

[0030] The embodiments of the present application disclose a continuous isomerization process and apparatus for methyltetrahydrophthalic anhydride.

[0031] Reference Figure 1 , Figure 3 and Figure 4 The invention discloses a continuous isomerization process and device for methyltetrahydrophthalic anhydride, comprising a processing tank 1, wherein a feed port 2 is provided through the outer wall of the processing tank 1, a one-way valve 3 is fixedly connected to the feed port 2, a stirring assembly is installed inside the processing tank 1, a discharge port 11 is provided on one side of the processing tank 1, two feeding chambers 12 are symmetrically fixedly connected to the top of the processing tank 1, a liquid storage tank 13 is fixedly connected to the inside of the two feeding chambers 12, a liquid storage tank 13 is fixedly provided with a liquid inlet 14 on the top of the liquid storage tank 13, an extrusion bin 15 is provided inside the two feeding chambers 12, a feed pipe 16 is fixedly connected through the bottom of the liquid storage tank 13, one end of the feed pipe 16 away from the liquid storage tank 13 is fixedly connected to the extrusion bin 15, a discharge pipe 17 is fixedly connected through the bottom of the extrusion bin 15, a one-way valve 18 is fixedly connected to the discharge pipe 17, and an adjusting assembly is installed on the top of the two feeding chambers 12.

[0032] When in use, the gas raw material required to participate in the continuous isomerization of methyltetrahydrophthalic anhydride is firstly injected into the interior of the processing tank 1 through the feed port 2, and then the one-way valve 13 is closed to seal the feed port 2 to prevent gas leakage, and then the C5 and maleic anhydride solutions are respectively injected into the corresponding liquid storage tanks 13 through the two liquid inlets 14. At this time, the two solutions are transmitted to the interior of the extrusion bin 15 according to the guidance of the feed pipe 16. When a continuous isomerization reaction is required, the one-way valve 18 can be opened and the regulating component can be started. With the operation of the regulating component, different solutions in the two extrusion bins 15 can be simultaneously discharged through the discharge pipe 17. The C5 and maleic anhydride solutions are dripped into the processing tank 1, and the dripping speed and feed ratio of the C5 and maleic anhydride solution can be stably controlled by adjusting the component to keep them stable, thereby improving the uniformity of the reaction conditions and effectively increasing the conversion rate of maleic anhydride and the quality of the final product. After the C5 and maleic anhydride solutions are gradually dripped into the processing tank 1, the stirring component can be started for continuous operation. The operation of the stirring component can effectively make the C5 and maleic anhydride solution and the gas raw material fully mixed and contacted to react, increase the gas-liquid contact time, strengthen the gas-liquid mass transfer, and improve the maleic anhydride conversion rate. Finally, the gas and liquid that are continuously isomerized can be discharged through the discharge port 11.

[0033] Reference Figure 1 and Figure 2 The stirring assembly includes a stirring rod 4 rotatably connected to the inside of the processing tank 1, a motor 5 is fixedly connected to the top of the processing tank 1, the output end of the motor 5 is fixedly connected to the top of the stirring rod 4, a plurality of stirring blades 6 are evenly and fixedly connected to the outer wall of the stirring rod 4, cleaning plates 7 are slidably provided at both ends of the plurality of stirring blades 6, grooves 8 are provided at both ends of the plurality of stirring blades 6, connecting blocks 9 are slidably connected inside the plurality of grooves 8, springs 10 are fixedly connected inside the plurality of grooves 8, one end of the spring 10 is fixedly connected to one end of the connecting block 9, one end of the connecting block 9 away from the spring 10 is fixedly connected to one side of the cleaning plate 7, and the other side of the cleaning plate 7 is in contact with the inner wall of the processing tank 1.

[0034] When in use, first start the motor 5 to drive the stirring rod 4 to rotate continuously. At this time, the rotation of the stirring rod 4 will cause the multiple stirring blades 6 to rotate continuously inside the processing tank 1, so as to continuously stir the solution inside the processing tank 1, effectively making the C5 and maleic anhydride solution and the gas raw material fully mixed and contacted to react, and increase the gas-liquid contact time, strengthen the gas-liquid mass transfer, and improve the maleic anhydride conversion rate. At the same time, while the multiple stirring blades 6 are continuously stirring, the two cleaning plates 7 will be driven to rotate continuously along the inner wall of the processing tank 1. In the process of rotation, through the elastic resistance of the groove 8, the cleaning plate 7 can be pushed to always fit with the inner wall of the processing tank 1 through the connecting block 9, so that the solution adhering to the inner wall of the processing tank 1 can be scraped off by the cleaning plate 7, so that the solution can better contact with the gas.

[0035] Reference Figure 1 , Figure 3 and Figure 4 The adjusting assembly includes a fixing frame 19 fixedly connected to the top of the two feeding chambers 12 respectively, and an adjusting plate 20 is slidably connected inside the two fixing frames 19. A plurality of springs 21 are fixedly connected to the upper and lower ends of the adjusting plate 20, and one end of the plurality of springs 21 away from the adjusting plate 20 is fixedly connected to the inner wall of the fixing frame 19. One side of the adjusting plate 20 is symmetrically fixedly connected with two connecting rods 30, and the inside of the two fixing frames 19 is slidably connected with an extrusion plate 31, and one end of the two connecting rods 30 away from the adjusting plate 20 is fixedly connected to the top of the extrusion plate 31. A driving member is provided on one side of the two fixing frames 19, and slide grooves 28 are provided on both sides of the inner walls of the two fixing frames 19. Slide blocks 29 are fixedly connected to both sides of the two adjusting plates 20, and the slide blocks 29 are slidably connected in the slide grooves 28; Secondly, the driving member includes two fixed plates 22 fixedly connected to one side of the two fixed frames 19, and the two fixed plates 22 are rotatably connected with a rotating shaft 23. The opposite surfaces of the two rotating shafts 23 are fixedly connected with a dual-axis motor 24, and the output ends of the dual-axis motor 24 are respectively fixedly connected to the two rotating shafts 23. Two residual gears 1 25 are symmetrically fixedly connected to one of the rotating shafts 23, and two residual gears 2 26 are symmetrically fixedly connected to the other rotating shaft 23. One side of the two adjustment plates 20 is symmetrically fixedly connected with a rack 27, and the two residual gears 1 25 and the residual gear 2 26 are both meshed with the rack 27. The number of saw teeth on the two residual gears 1 25 is 1.5 times the number of saw teeth on the two residual gears 26.

[0036] When in use, first start the dual-axis motor 24 to drive the two rotating shafts 23 to rotate continuously. As the rotating shaft 23 rotates, the two residual gears 1 25 and the residual gear 2 26 are driven to rotate together. Because the two residual gears 1 25 and the residual gear 2 26 are meshed with the rack 27, the two residual gears 1 25 and the residual gear 2 26 are intermittently in contact with the rack 27 while rotating. When the saw teeth on the two residual gears 1 25 and the residual gear 2 26 are in contact with the rack 27, the two adjustment plates 20 are driven to descend inside the two fixed frames 19 under the guidance of the slider 29. At this time, the two adjustment plates 20 will squeeze the spring 2 21 at the bottom to contract, and the movement of the adjustment plate 20 will drive the connecting rod 30 to squeeze the extrusion plate 31, so that the extrusion plate 31 can gradually descend inside the extrusion bin 15. At this time, the extrusion of the extrusion plate 31 will cause the C5 and maleic anhydride solutions inside the two extrusion bins 15 to drip into the inside of the processing tank 1 through the discharge pipe 17; Secondly, when the saw teeth on the two residual gears 1 25 and the residual gear 2 26 are separated from the rack 27, the two adjustment plates 20 will lose the extrusion force. At this time, according to the rebound of the multiple springs 21, the two adjustment plates 20 will be driven to rebound and rise in the fixed frame 19, so as to drive the extrusion plate 31 to rise inside the extrusion chamber 15 through the connecting rod 30 and generate negative pressure. As the two residual gears 1 25 and the residual gear 2 26 continue to rotate, the two saw teeth can be cyclically and continuously contacted and separated from the rack 27, so that the extrusion plate 31 can keep the dripping speed of the C5 and maleic anhydride solutions inside the two extrusion chambers 15 stable and controlled, and the dripping speed of the two solutions can be changed by adjusting the speed of the dual-axis motor 24. In addition, because the number of saw teeth on the two residual gears 1 25 is 1.5 times the number of saw teeth on the two residual gears 26, during the dripping process, the saw teeth on the two residual gears 1 25 can contact with the rack 27 faster, so that C5 The ratio of maleic anhydride to maleic anhydride is as high as 1:1.5, so as to achieve the stability of the feed ratio, improve the uniformity of the reaction conditions, and effectively increase the conversion rate of maleic anhydride and the quality of the final product.

[0037] The implementation principle of the continuous isomerization process and device of methyltetrahydrophthalic anhydride in this embodiment is as follows: when in use, the gas raw material required to participate in the continuous isomerization of methyltetrahydrophthalic anhydride is firstly injected into the interior of the processing tank 1 through the feed port 2, and then the one-way valve 1 3 is closed to seal the feed port 2 to prevent gas leakage, and then the C5 and maleic anhydride solutions are respectively injected into the corresponding liquid storage tanks 13 through the two liquid inlets 14. At this time, the two solutions are transmitted to the interior of the extrusion bin 15 according to the guidance of the feed pipe 16. When a continuous isomerization reaction is required, the one-way valve 2 18 can be opened and the dual-axis motor 24 can be started to drive the two rotating shafts 23 to rotate continuously. As the rotating shaft 23 rotates, the two residual gears 1 25 and the residual gear 2 26 are driven to rotate together, and Because the two residual gears 1 25 and the residual gear 2 26 are meshed with the rack 27, the two residual gears 1 25 and the residual gear 2 26 will intermittently contact the rack 27 while rotating. When the saw teeth on the two residual gears 1 25 and the residual gear 2 26 contact the rack 27, the two adjustment plates 20 will be driven to descend inside the two fixed frames 19 under the guidance of the slider 29. At this time, the two adjustment plates 20 will squeeze the spring 21 at the bottom to contract, and the movement of the adjustment plates 20 will drive the connecting rod 30 to squeeze the extrusion plate 31, so that the extrusion plate 31 can gradually descend inside the extrusion bin 15. At this time, the extrusion of the extrusion plate 31 will cause the C5 and maleic anhydride solutions inside the two extrusion bins 15 to drip into the inside of the processing tank 1 through the discharge pipe 17; Secondly, when the saw teeth on the two residual gears 1 25 and the residual gear 2 26 are separated from the rack 27, the two adjustment plates 20 will lose the extrusion force. At this time, according to the rebound of the multiple springs 21, the two adjustment plates 20 will be driven to rebound and rise in the fixed frame 19, so as to drive the extrusion plate 31 to rise inside the extrusion chamber 15 through the connecting rod 30 and generate negative pressure. As the two residual gears 1 25 and the residual gear 2 26 continue to rotate, the two saw teeth can be cyclically and continuously contacted and separated from the rack 27, so that the extrusion plate 31 can keep the dripping speed of the C5 and maleic anhydride solutions inside the two extrusion chambers 15 stable and controlled, and the dripping speed of the two solutions can be changed by adjusting the speed of the dual-axis motor 24. In addition, because the number of saw teeth on the two residual gears 1 25 is 1.5 times the number of saw teeth on the two residual gears 26, during the dripping process, the saw teeth on the two residual gears 1 25 can contact with the rack 27 faster, so that C5 The ratio of maleic anhydride to maleic anhydride is as high as 1:1.5, so as to achieve the stability of the feed ratio, improve the uniformity of the reaction conditions, and effectively increase the conversion rate of maleic anhydride and the quality of the final product; When C5 and maleic anhydride solution are gradually added to the interior of the processing tank 1, the motor 5 can be started to drive the stirring rod 4 to rotate continuously. At this time, the rotation of the stirring rod 4 will cause multiple stirring blades 6 to rotate continuously inside the processing tank 1, so as to continuously stir the solution inside the processing tank 1, effectively allowing the C5 and maleic anhydride solution to fully mix and contact with the gas raw material, increase the gas-liquid contact time, strengthen the gas-liquid mass transfer, and improve the maleic anhydride conversion rate. At the same time, while the multiple stirring blades 6 are continuously stirring, the two cleaning plates 7 will be driven to rotate continuously along the inner wall of the processing tank 1. In the process of rotation, through the elastic resistance of the groove 8, the cleaning plate 7 can be pushed to always fit with the inner wall of the processing tank 1 through the connecting block 9, so that the solution adhering to the inner wall of the processing tank 1 can be scraped off by the cleaning plate 7, so that the solution can better contact with the gas, and finally the gas and liquid that are continuously isomerized can be discharged through the discharge port 11.

Claims

1. A process and apparatus for the continuous isomerization of methyltetrahydrophthalic anhydride, comprising a processing tank (1), characterized in that: The outer wall of the processing tank (1) is provided with a feed inlet (2) through which a one-way valve (3) is fixedly connected. A stirring assembly is installed inside the processing tank (1). A discharge port (11) is provided on one side of the processing tank (1). Two feeding chambers (12) are symmetrically fixedly connected to the top of the processing tank (1). The insides of the two feeding chambers (12) are fixedly connected to a liquid storage tank (13). The top of the liquid storage tank (13) is fixedly provided with a liquid inlet (11). 4), the two feeding chambers (12) are each provided with an extrusion chamber (15), a feeding pipe (16) is fixedly connected to the bottom of the liquid storage tank (13), the end of the feeding pipe (16) away from the liquid storage tank (13) is fixedly connected to the extrusion chamber (15), a discharge pipe (17) is fixedly connected to the bottom of the extrusion chamber (15), a one-way valve (18) is fixedly connected to the discharge pipe (17), and an adjustment component is installed on the top of the two feeding chambers (12).

2. The continuous isomerization process and device for methyltetrahydrophthalic anhydride according to claim 1, characterized in that: The stirring assembly comprises a stirring rod (4) rotatably connected to the inside of the processing tank (1); a motor 1 (5) is fixedly connected to the top of the processing tank (1); an output end of the motor 1 (5) is fixedly connected to the top of the stirring rod (4); and a plurality of stirring blades (6) are evenly and fixedly connected to the outer wall of the stirring rod (4).

3. The continuous isomerization process and device for methyltetrahydrophthalic anhydride according to claim 2, characterized in that: Cleaning plates (7) are slidably provided at both ends of the plurality of stirring blades (6), grooves (8) are provided at both ends of the plurality of stirring blades (6), connecting blocks (9) are slidably connected inside the plurality of grooves (8), springs (10) are fixedly connected inside the plurality of grooves (8), one end of the spring (10) is fixedly connected to one end of the connecting block (9), one end of the connecting block (9) away from the spring (10) is fixedly connected to one side of the cleaning plate (7), and the other side of the cleaning plate (7) is in contact with the inner wall of the processing tank (1).

4. The continuous isomerization process and device for methyltetrahydrophthalic anhydride according to claim 1, characterized in that: The adjustment assembly comprises a fixing frame (19) fixedly connected to the top of the two feeding chambers (12), the inside of the two fixing frames (19) are slidably connected to an adjustment plate (20), the upper and lower ends of the adjustment plate (20) are fixedly connected to a plurality of springs (21), one end of the plurality of springs (21) away from the adjustment plate (20) is fixedly connected to the inner wall of the fixing frame (19), one side of the adjustment plate (20) is symmetrically fixedly connected to two connecting rods (30), the inside of the two fixing frames (19) are slidably connected to an extrusion plate (31), one end of the two connecting rods (30) away from the adjustment plate (20) is fixedly connected to the top of the extrusion plate (31), and one side of the two fixing frames (19) is provided with a driving member.

5. The continuous isomerization process and device for methyltetrahydrophthalic anhydride according to claim 4, characterized in that: Slide grooves (28) are provided on both sides of the inner walls of the two fixing frames (19), and sliding blocks (29) are fixedly connected to both sides of the two adjustment plates (20), and the sliding blocks (29) are slidably connected in the slide grooves (28).

6. The continuous isomerization process and device for methyltetrahydrophthalic anhydride according to claim 4, characterized in that: The driving member comprises two fixed plates (22) fixedly connected to one side of the two fixed frames (19), a rotating shaft (23) being rotatably connected inside the two fixed plates (22), a dual-axis motor (24) being fixedly connected to opposite surfaces of the two rotating shafts (23), an output end of the dual-axis motor (24) being fixedly connected to the two rotating shafts (23), one of the rotating shafts (23) being symmetrically fixedly connected to two residual gears 1 (25), and the other rotating shaft (23) being symmetrically fixedly connected to two residual gears 2 (26), and one side of the two adjustment plates (20) being symmetrically fixedly connected to racks (27), the two residual gears 1 (25) and the residual gear 2 (26) being meshingly connected to the racks (27).

7. The continuous isomerization process and device for methyltetrahydrophthalic anhydride according to claim 6, characterized in that: The number of teeth on the two broken gears one (25) is 1.5 times the number of teeth on the two broken gears two (26).

8. The continuous isomerization process of methyltetrahydrophthalic anhydride according to claims 1-7, characterized in that: The steps include: S1: First, the gas raw material to be used for the continuous isomerization of methyltetrahydrophthalic anhydride is injected into the interior of the processing tank (1) through the feed port (2), then the one-way valve (3) is closed to seal the feed port (2) to prevent gas leakage, and the C5 and maleic anhydride solutions are injected into the corresponding liquid storage tanks (13) through the two liquid inlets (14); S2: Open the second one-way valve (18) and start the operation of the regulating component, so that the different solutions in the two extrusion chambers (15) can be simultaneously dripped into the interior of the processing tank (1) through the guidance of the discharge pipe (17), and the dripping speed and feed ratio of the C5 and maleic anhydride solutions are stably controlled so that the ratio of C5 and maleic anhydride reaches 1:1.5 as much as possible, thereby improving the uniformity of the reaction conditions and effectively increasing the conversion rate of maleic anhydride and the quality of the final product; S3: After C5 and maleic anhydride solution are gradually dripped into the processing tank (1), the stirring component can be started to effectively allow the C5 and maleic anhydride solution to fully mix and contact with the gas raw material, increase the gas-liquid contact time, strengthen the gas-liquid mass transfer, and improve the maleic anhydride conversion rate. Finally, the gas and liquid that have been continuously isomerized can be discharged through the discharge port (11).

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