A crude phthalic anhydride heating device

Abstract

The present invention discloses a crude phthalic anhydride heating device, and relates to the technical field of heating devices. The present invention includes a protective cover fixedly mounted on a heating kettle, and also includes: an electric heating rod, the electric heating rod is mounted on the heating kettle through a rotating rod, and a shaking-off component is installed between the rotating rod and the heating kettle, and an energizing component matched with the rotating rod is installed on the heating kettle, and the energizing component is used to supply power to the rotating rod so that the electric heating rod heats the crude phthalic anhydride, and a scraping component matched with the shaking-off component is also installed in the heating kettle. The advantage is that the present invention can automatically switch the emission of waste gas and water vapor and the shaking-off of phthalic anhydride crystals according to the heating process, so that the waste gas and water vapor generated in the pre-decomposition and distillation process can be discharged in time, ensuring the pre-decomposition and distillation effects, and at the same time, avoiding the adhesion of phthalic anhydride crystals on the electric heating rod and the inner wall of the heating kettle after the heating is completed, effectively reducing the difficulty of subsequent collection.

Description

Technical Field

[0001] The invention relates to the technical field of heating devices, in particular to a crude phthalic anhydride heating device. Background Art

[0002] Phthalic anhydride, also known as phthalic anhydride, is widely used in chemical, pharmaceutical, electronic, agricultural, coating, fine chemical and other industrial sectors. At present, phthalic anhydride is generally produced by the ortho-method. The phthalic anhydride obtained by this method is called crude phthalic anhydride, which needs to be pre-decomposed and distilled to obtain a relatively pure phthalic anhydride product. During the pre-decomposition and distillation treatment, a heating device is indispensable.

[0003] The existing heating device can control the heating temperature according to the processing progress to ensure that the crude phthalic anhydride completes the pre-decomposition and distillation treatment smoothly, but there is no effective intervention in the treatment of the waste gas and water vapor generated during the heating process. Untimely discharge will cause the waste gas and water vapor to combine with the crude phthalic anhydride again, and after the heating is completed, the crude phthalic anhydride will form phthalic anhydride crystals. These crystals will adhere to the inside of the heating device, making the subsequent discharge operation inconvenient. Therefore, it is necessary to design a crude phthalic anhydride heating device. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a crude phthalic anhydride heating device, which solves the problems raised in the above background technology.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A crude phthalic anhydride heating device, comprising a protective cover fixedly mounted on a heating kettle, and further comprising:

[0007] An electric heating rod, wherein the electric heating rod is mounted on the heating kettle via a rotating rod, and a shaking assembly is mounted between the rotating rod and the heating kettle, and an energizing assembly matched with the rotating rod is mounted on the heating kettle, and the energizing assembly is used to supply power to the rotating rod so that the electric heating rod heats the crude phthalic anhydride, and a scraping assembly matched with the shaking assembly is also mounted in the heating kettle;

[0008] A driving part, the driving part is used to drive the rotation of the rotating rod, the driving part comprises a motor fixedly mounted on the protective cover, the output end of the motor is fixedly connected to the driving rod, and a connecting assembly is installed between the driving rod and the rotating rod;

[0009] The dehumidification part is used to extract the moisture in the heating kettle. The dehumidification part includes an extraction seat fixedly mounted on the heating kettle, and a one-way exhaust pipe is fixedly connected between the extraction seat and the heating kettle. The extraction seat is also fixedly connected with a one-way discharge pipe. A reciprocating suction component is installed on the extraction seat. The reciprocating suction component is used to extract the water vapor in the heating kettle. A transmission component matched with a driving rod is installed on the extraction seat;

[0010] The switching part includes an electric telescopic rod fixedly mounted on the protective cover, and the output end of the electric telescopic rod is fixedly connected with a connecting rod matched with the power-on component, and a contact component matched with the transmission component is installed on the connecting rod, and the contact component matches with the reciprocating suction component and the vibration-dropping component.

[0011] Furthermore, the power-on component includes a power-on ring and a resistor fixedly mounted on the heating kettle, a conductive rod fixedly mounted on the resistor, the conductive rod and the resistor are electrically connected to the power-on ring through an electric wire, a power-on ring in contact with the power-on ring is fixedly mounted on the rotating rod, a conductive ring is slidably mounted on the resistor, and a fixing rod is fixedly mounted between the conductive ring and the connecting rod.

[0012] Furthermore, the shaking assembly includes a fixed ring fixedly mounted on the rotating rod, a cylindrical groove matching with the fixed ring is opened in the heating kettle, and a movable ring is slidably installed in the cylindrical groove, a plurality of springs are installed between the bottom of the movable ring and the cylindrical groove, two sliding blocks are fixedly mounted on the side wall of the movable ring, and two sliding grooves matching with the corresponding sliding blocks are opened on the side wall of the cylindrical groove.

[0013] Furthermore, the scraping assembly includes a sealing ring rotatably installed in the heating kettle, and a sweeping plate and a scraper attached to the inner wall of the heating kettle are fixedly installed at the bottom of the sealing ring, an annular groove communicating with two slide grooves is opened in the heating kettle, and a rotating ring is rotatably installed in the annular groove, a cross bar is fixedly installed between the rotating ring and the sealing ring, a connecting groove matching the cross bar is opened on the side wall of the annular groove, a spiral groove is opened on the inner wall of the rotating ring, and a guide block matching the spiral groove is fixedly installed on the side wall of one of the sliders.

[0014] Furthermore, the connecting assembly includes a cross rod fixedly mounted at the bottom of the driving rod, a cross groove slidingly matched with the cross rod is opened on the top of the rotating rod, the depth of the cross groove is greater than the depth of the cylindrical groove, and a convex ring is fixedly mounted on the side wall of the rotating rod.

[0015] Furthermore, a support rod is fixedly mounted on the side wall of the extraction seat, and a rotating shaft is rotatably mounted on the support rod. A convex rod matching with a convex ring is fixedly mounted on the side wall of the rotating shaft, and the length of the convex rod is less than or equal to the depth of the cylindrical groove.

[0016] Furthermore, the reciprocating suction assembly includes a reciprocating screw rotatably mounted on an extraction seat, and a piston plate is threadedly mounted on one end of the reciprocating screw located in the extraction seat, and a through hole is provided at one end of the extraction seat away from the one-way suction pipe and the one-way discharge pipe.

[0017] Furthermore, the transmission assembly includes an active bevel gear fixedly mounted on the driving rod, a support rod fixedly mounted on the side wall of the extraction seat, and a round rod rotatably mounted on the support rod, a driven bevel gear meshing with the active bevel gear fixedly mounted on the round rod, and a driving gear fixedly mounted on one end of the round rod away from the driven bevel gear.

[0018] Furthermore, the contact assembly includes two mounting rods fixedly mounted on the fixed rod, and the first gear and the second gear are rotatably mounted on the ends of the two mounting rods away from the fixed rod, respectively. The first gear and the second gear are both matched with the driving gear. A first plug rod is fixedly mounted on the first gear, and a first slot that slides with the first plug rod is provided on the rotating shaft. A second plug rod is fixedly mounted on the second gear, and a second slot that slides with the second plug rod is provided on the reciprocating screw rod.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1: Through the cooperation of the transmission component and the reciprocating suction component, the waste gas and water vapor generated during the heating process can be extracted and discharged in time to avoid the problem of poor pre-decomposition and distillation effect caused by combining with crude phthalic anhydride again, thereby effectively improving the heating efficiency.

[0021] 2: Through the cooperation of the vibration component and the scraping component, after heating is completed, the electric heating rod can vibrate up and down in the heating kettle during the rotation process, and the up and down vibration of the electric heating rod can be used to make the sweeping plate and the scraper rotate at the same time, so as to shake off the phthalic anhydride crystals attached to the electric heating rod and the inner wall of the heating kettle, thereby reducing the difficulty of subsequent collection.

[0022] 3: Through the design of the switching part, the temperature control of the electric heating rod can be used to realize the connection relationship between the reciprocating suction component and the vibration component and the transmission component, so that the emission of waste gas water vapor and the shaking off of phthalic anhydride crystals can be automatically switched according to the heating process, ensuring the smooth and orderly completion of the pre-decomposition and distillation treatment.

[0023] In summary, the present invention can automatically switch the emission of waste gas and water vapor and the shaking off of phthalic anhydride crystals according to the heating process, so that the waste gas and water vapor generated in the pre-decomposition and distillation processes can be discharged in time, ensuring the pre-decomposition and distillation effects. At the same time, after the heating is completed, the phthalic anhydride crystals are prevented from adhering to the electric heating rod and the inner wall of the heating kettle, which effectively reduces the difficulty of subsequent collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of a crude phthalic anhydride heating device proposed by the present invention;

[0025] Figure 2 for Figure 1 Schematic diagram of the structure after removing the protective cover;

[0026] Figure 3 for Figure 2 A top view of the structure in the middle;

[0027] Figure 4 for Figure 3 Schematic diagram of the structure of the AA surface in the middle;

[0028] Figure 5 for Figure 4 Schematic diagram of the three-dimensional structure;

[0029] Figure 6 for Figure 5 A schematic diagram of the structure of part a in the middle is enlarged;

[0030] Figure 7 for Figure 2 Schematic diagram of the structure after removing the heating kettle;

[0031] Figure 8 for Figure 7 Schematic diagram of the structure at the middle sealing ring;

[0032] Fig. 9 for Figure 7 Schematic diagram of the structure where the sealing ring is removed;

[0033] Fig.10 for Fig. 9 Schematic diagram of structural decomposition;

[0034] Fig.11 for Fig. 9 A schematic diagram of the structure from another perspective;

[0035] Fig.12 for Fig.10 A schematic diagram of the structure from another perspective;

[0036] Fig.13 for Fig.10 An enlarged schematic diagram of the structure at the middle mobile ring;

[0037] Fig.14 for Fig.10 A magnified schematic diagram of the structure at the resistor in the middle.

[0038] In the figure: 1, heating kettle; 2, protective cover; 3, rotating rod; 4, electric heating rod; 5, power ring; 6, power connection ring; 7, resistor; 8, conductive rod; 9, conductive ring; 10, fixed ring; 11, cylindrical groove; 12, spring; 13, moving ring; 14, motor; 15, driving rod; 16, cross rod; 17, cross groove; 18, extraction seat; 19, one-way exhaust pipe; 20, one-way discharge pipe; 21, convex ring; 22, support rod; 23, rotating shaft; 24, Convex rod; 25, electric telescopic rod; 26, connecting rod; 27, fixing rod; 28, mounting rod; 29, first gear; 30, second gear; 31, first plug rod; 32, second plug rod; 33, active bevel gear; 34, driven bevel gear; 35, driving gear; 36, annular groove; 37, rotating ring; 38, sealing ring; 39, cross bar; 40, connecting groove; 41, sweeping plate; 42, scraper; 43, spiral groove; 44, slider; 45, guide block. DETAILED DESCRIPTION

[0039] Reference Figure 1-Figure 14 A crude phthalic anhydride heating device comprises a protective cover 2 fixedly mounted on a heating kettle 1. The heating kettle 1 is also provided with a feeding port and a discharging port. The feeding port is used to feed the crude phthalic anhydride and the corresponding raw materials into the heating kettle 1. The discharging port is used to take the phthalic anhydride out of the heating kettle 1 after the heating is completed. The feeding port and the discharging port are not shown in the figure. The device also comprises:

[0040] The electric heating rod 4 is installed on the heating kettle 1 through the rotating rod 3. The heating kettle 1 is equipped with an electric component that matches the rotating rod 3. The electric component is used to supply power to the rotating rod 3 so that the electric heating rod 4 heats the crude phthalic anhydride. The electric component includes a power connection ring 6 and a resistor 7 fixedly installed on the heating kettle 1. A conductive rod 8 is fixedly installed on the resistor 7. The conductive rod 8 and the resistor 7 are electrically connected to the power connection ring 6 through an electric wire. A power connection ring 5 in contact with the power connection ring 6 is fixedly installed on the rotating rod 3. A conductive ring 9 is slidably installed on the resistor 7. The two ends of the wire connected to the resistor 7 are respectively at the lower left of the resistor 7 and the upper right of the conductive rod 8 (such as Fig.14 As shown), when the power is turned on, the current passes through the resistor 7, the conductive ring 9 and the conductive rod 8. When the conductive ring 9 is located at the leftmost side of the resistor 7, the resistance in the circuit is the smallest. At this time, under the condition of constant voltage, the current passing through the circuit increases, and the heat generated by the electric heating rod 4 will increase. On the contrary, when the conductive ring 9 is located at the rightmost side of the resistor 7, the heat generated by the electric heating rod 4 is the smallest. By adjusting the position of the conductive ring 9 on the resistor 7, the heating temperature in the heating kettle 1 can be controlled to meet the temperature requirements in the crude phthalic anhydride production process. The power supply and wires are not shown in the figure.

[0041] The driving part is used to drive the rotation of the rotating rod 3. The driving part includes a motor 14 fixedly mounted on the protective cover 2. The output end of the motor 14 is fixedly connected to a driving rod 15, and a connecting assembly is installed between the driving rod 15 and the rotating rod 3. The connecting assembly includes a cross rod 16 fixedly mounted on the bottom of the driving rod 15. The top of the rotating rod 3 is provided with a cross groove 17 that slidably cooperates with the cross rod 16. The cooperation between the cross groove 17 and the cross rod 16 allows the rotating rod 3 to rotate simultaneously when the driving rod 15 rotates. Therefore, when the motor 14 is working, the electric heating rod 4 can be rotated in the heating kettle 1, and the crude phthalic anhydride in the heating kettle 1 can be stirred and heated by the electric heating rod 4, so that the overall heating is uniform, local overheating or insufficient heating is avoided, and the pre-decomposition and distillation rates are improved. The motor 14 can specifically adopt a motor that can only rotate in one direction, which is commonly seen in daily life and work.

[0042] A shaking assembly is installed between the rotating rod 3 and the heating kettle 1. The shaking assembly includes a fixed ring 10 fixedly installed on the rotating rod 3. A cylindrical groove 11 matching with the fixed ring 10 is provided in the heating kettle 1, and a moving ring 13 is slidably installed in the cylindrical groove 11. A plurality of springs 12 are installed between the bottom of the moving ring 13 and the cylindrical groove 11. Two sliding blocks 44 are fixedly installed on the side wall of the moving ring 13. Two sliding grooves matching with the corresponding sliding blocks 44 are provided on the side wall of the cylindrical groove 11. When the rotating rod 3 is pressed down, When the rotating rod 3 moves, the fixed ring 10 on it presses down the movable ring 13 so that the spring 12 is squeezed. When the downward pressure shown by the rotating rod 3 disappears, the elastic force of the spring 12 will make the fixed ring 10 move up and reset and vibrate up and down. At this time, the phthalic anhydride crystals attached to the electric heating rod 4 can be shaken off by the rotation of the rotating rod 3, thereby reducing the difficulty of subsequent collection of phthalic anhydride. The depth of the cross groove 17 is greater than the depth of the cylindrical groove 11. The purpose of the depth design at this time is to ensure that the driving rod 15 can always be effectively connected with the rotating rod 3.

[0043] A scraping assembly that cooperates with the shaking assembly is also installed in the heating kettle 1. The scraping assembly includes a sealing ring 38 that is rotatably installed in the heating kettle 1. An annular groove that cooperates with the sealing ring 38 is opened on the inner wall of the heating kettle 1. The annular groove is not marked in the figure, and a sweeping plate 41 and a scraper 42 that are attached to the inner wall of the heating kettle 1 are fixedly installed at the bottom of the sealing ring 38. When the sealing ring 38 rotates, the sweeping plate 41 and the scraper 42 cooperate to scrape the inner wall and the bottom of the inner wall of the heating kettle 1, and sweep and scrape off the attached phthalic anhydride crystals, thereby further reducing the difficulty of subsequent collection of phthalic anhydride.

[0044] An annular groove 36 communicating with the two slide grooves is provided in the heating kettle 1, and a rotating ring 37 is rotatably installed in the annular groove 36, a cross bar 39 is fixedly installed between the rotating ring 37 and the sealing ring 38, a connecting groove 40 matching with the cross bar 39 is provided on the side wall of the annular groove 36, a spiral groove 43 is provided on the inner wall of the rotating ring 37, and a guide block 45 matching with the spiral groove 43 is fixedly installed on the side wall of one of the sliders 44. When the fixed ring 10 moves up and down in the cylindrical groove 11, the rotating ring 37 can be rotated by the cooperation of the guide block 45 and the spiral groove 43 through the up and down movement of the movable ring 13, thereby driving the sweeping plate 41 and the scraper 42 to rotate in the heating kettle 1, so as to realize the sweeping and scraping treatment of the phthalic anhydride crystals.

[0045] The dehumidification part is used to extract the moisture in the heating kettle 1. The dehumidification part includes an extraction seat 18 fixedly installed on the heating kettle 1, and a one-way exhaust pipe 19 is fixedly connected between the extraction seat 18 and the heating kettle 1. The extraction seat 18 is also fixedly connected with a one-way exhaust pipe 20. The one-way exhaust pipe 19 can unidirectionally extract the gas or moisture in the heating kettle 1 into the extraction seat 18, and the one-way exhaust pipe 20 can unidirectionally discharge the gas or moisture in the extraction seat 18 to the outside. A reciprocating suction component is installed on the extraction seat 18. The reciprocating suction component is used to extract the water vapor in the heating kettle 1. The reciprocating suction component includes a reciprocating screw rod rotatably installed on the extraction seat 18, and the reciprocating screw rod is used to extract the water vapor in the heating kettle 1. A piston plate is threadedly installed on one end of the screw rod located in the extraction seat 18, and a through hole is provided at one end of the extraction seat 18 away from the one-way exhaust pipe 19 and the one-way discharge pipe 20. The reciprocating screw rod and the piston plate are not shown in the figure. By cooperating with the reciprocating screw rod and the piston plate, the piston plate can be driven to reciprocate in the extraction seat 18 when the reciprocating screw rod rotates, and then the reciprocating movement of the piston plate is utilized to enable the one-way exhaust pipe 19 and the one-way discharge pipe 20 to complete the extraction and discharge of water vapor in the heating kettle 1. Through this design, the heating treatment of crude phthalic anhydride can be completed more quickly, the heating efficiency can be improved, and the problem of gas or moisture precipitated by heating being mixed with the crude phthalic anhydride again can be avoided.

[0046] A convex ring 21 is fixedly installed on the side wall of the rotating rod 3, a support rod 22 is fixedly installed on the side wall of the extraction seat 18, and a rotating shaft 23 is rotatably installed on the support rod 22, and a convex rod 24 matching the convex ring 21 is fixedly installed on the side wall of the rotating shaft 23, and the length of the convex rod 24 is less than or equal to the depth of the cylindrical groove 11. When the rotating shaft 23 rotates, the convex ring 21 can be pressed down by the rotation of the convex rod 24 thereon. At this time, the convex ring 21 can drive the rotating rod 3 to move downward, so that the fixed ring 10 presses down the movable ring 13. When the convex rod 24 rotates and separates from the convex ring 21, the elastic force of the spring 12 can make the movable ring 13 push the fixed ring 10 to reset, thereby realizing the up and down vibration of the electric heating rod 4 in the heating kettle 1.

[0047] A transmission assembly that cooperates with the drive rod 15 is installed on the extraction seat 18, and the transmission assembly includes a driving bevel gear 33 fixedly installed on the drive rod 15, a support rod is fixedly installed on the side wall of the extraction seat 18, and a round rod is rotatably installed on the support rod, a driven bevel gear 34 meshing with the driving bevel gear 33 is fixedly installed on the round rod, and a driving gear 35 is fixedly installed on one end of the round rod away from the driven bevel gear 34. Through the meshing effect of the driving bevel gear 33 and the driven bevel gear 34, when the drive rod 15 rotates, the driving gear 35 can be rotated simultaneously under the action of the round rod, wherein the round rod and the support rod are not marked in the figure.

[0048] The switching part includes an electric telescopic rod 25 fixedly mounted on the protective cover 2, and the output end of the electric telescopic rod 25 is fixedly connected to a connecting rod 26, and a fixed rod 27 is fixedly mounted between the conductive ring 9 and the connecting rod 26. The electric telescopic rod 25 is an existing product, and its working principle is not described in detail here. Through the operation of the electric telescopic rod 25, the connecting rod 26 can be driven to move in the protective cover 2. At the same time, under the action of the fixed rod 27, the conductive ring 9 can be moved on the resistor 7 to adjust the resistance size.

[0049] A contact assembly that cooperates with the transmission assembly is installed on the connecting rod 26, and the contact assembly cooperates with the reciprocating suction assembly and the vibration assembly. The contact assembly includes two mounting rods 28 fixedly mounted on the fixed rod 27, and the ends of the two mounting rods 28 away from the fixed rod 27 are respectively rotatably mounted with a first gear 29 and a second gear 30. The first gear 29 and the second gear 30 are both matched with the driving gear 35. A first plug rod 31 is fixedly mounted on the first gear 29, and a second plug rod 31 is provided on the rotating shaft 23. A slot, a second rod 32 is fixedly mounted on the second gear 30, a second slot slidably matched with the second rod 32 is opened on the reciprocating screw, the cross-sections of the first rod 31, the first slot, the second rod 32 and the second slot are all square, the first rod 31 cooperates with the first slot, so that the first gear 29 can maintain the transmission effect on the rotating shaft 23 when it moves relative to the rotating shaft 23, and the second rod 32 cooperates with the second slot, so that the second gear 30 can maintain the transmission effect on the reciprocating screw when it moves relative to the reciprocating screw;

[0050] When the conductive ring 9 is located at the rightmost side of the resistor 7, the second gear 30 and the driving gear 35 are meshed with each other. When the crude phthalic anhydride is heated at the beginning, the electric telescopic rod 25 is first extended, and the conductive ring 9 moves to the left on the resistor 7, the resistance decreases, and the current increases. When the electric telescopic rod 25 moves to a certain distance, it stops running (the conductive ring 9 has not moved to the leftmost side of the resistor 7 at this time). At this time, the electric heating rod 4 starts to heat up until it reaches the specified temperature, which is set to 250°C. At this temperature, the water, o-tolualdehyde and benzoic acid in the crude phthalic anhydride can be gasified and separated, and the gasification temperature of phthalic anhydride is about 295°C, so the gasified part will be less. At the same time, the second gear 30 and the first gear 29 move to the left at the same time. At this time, the second gear 30 is still meshed with the driving gear 35, but the first gear 29 is not meshed with the driving gear 35. At this time, the starting motor 14 can make the electric heating rod 4 rotate horizontally in the heating kettle 1, and the water vapor and the like in the heating process are extracted and collected by the rotation of the reciprocating screw.

[0051] After heating for a certain period of time to complete the pre-decomposition, the electric telescopic rod 25 is continued to be extended until the conductive ring 9 moves to the leftmost side of the resistor 7, and the power is continued to be supplied to allow the electric heating rod 4 to continue to heat up to 280°C. At this time, the second gear 30 is separated from the driving gear 35, and the first gear 29 is engaged with the driving gear 35. At this time, the operation of the motor 14 will cause the electric heating rod 4 to vibrate up and down during the rotation process, so that the electric heating rod 4 moves up and down while rotating, and the phthalic anhydride attached thereto is shaken off, and the dispersion uniformity of the phthalic anhydride at this time is improved, the heating efficiency is improved, and the phthalic anhydride is crystallized faster. At the same time, the sweeping plate 41 and the scraper 42 rotate at the same time to sweep and scrape off the phthalic anhydride attached to the inner wall of the heating kettle 1. After the heating is completed, the power is stopped so that the electric heating rod 4 no longer heats the heating kettle 1, and the motor 14 is continued to rotate. At this time, the rotation and up and down vibration of the electric heating rod 4 can shake off the phthalic anhydride crystals attached thereto, which is convenient for the subsequent collection of phthalic anhydride.

[0052] In the present invention, a crude phthalic anhydride heating device works as follows:

[0053] Pre-decomposition of crude phthalic anhydride: put the crude phthalic anhydride to be treated into the heating kettle 1, start the electric telescopic rod 25 to make the conductive ring 9 move a certain distance on the resistor 7, and then turn on the power to gradually heat the electric heating rod 4 to 250°C. At the same time, start the motor 14. When the motor 14 is working, it drives the rotating rod 3 to rotate through the driving rod 15, so that the electric heating rod 4 rotates in the heating kettle 1, stirring the crude phthalic anhydride so that it is heated evenly;

[0054] During this process, the first gear 29 is not meshed with the driving gear 35, and the second gear 30 is meshed with the driving gear 35. Therefore, the rotation of the driving rod 15 will also drive the second gear 30 to rotate through the driving gear 35, so that the reciprocating screw rod continues to rotate. At this time, the one-way exhaust pipe 19 and the one-way discharge pipe 20 can extract the gas and water vapor generated in the heating kettle 1.

[0055] Distillation treatment of crude phthalic anhydride: After the pre-decomposition is completed, the electric telescopic rod 25 is continuously started to move the conductive ring 9 on the resistor 7 for a certain distance, so that the electric heating rod 4 is further heated to 280°C, and the second gear 30 is kept meshing with the driving gear 35 and the first gear 29 is separated from the driving gear 35. At this time, the motor 14 is kept working, and the electric heating rod 4 can heat the crude phthalic anhydride at a higher temperature and stir it at the same time, so that the water therein is precipitated and discharged faster;

[0056] Crystallization treatment: After the distillation treatment is completed, the electric telescopic rod 25 is continued to be started to move the conductive ring 9 to the far left on the resistor 7. At this time, the heating rod 4 continues to heat up. After its temperature reaches the maximum temperature, the power supply is stopped, and then the motor 14 is continued to be started. At this time, the first gear 29 is engaged with the driving gear 35, and the second gear 30 is separated from the driving gear 35. Therefore, the rotation of the driving rod 15 can make the rotating rod 3 drive the heating rod 4 to rotate in the heating kettle 1 while vibrating up and down, and the up and down vibration of the rotating rod 3 is used to make the sweeping plate 41 and the scraper 42 rotate in the heating kettle 1, and the phthalic anhydride crystals attached to the heating rod 4 and the inner wall of the heating kettle 1 are scraped off, so as to facilitate the subsequent collection of phthalic anhydride.

[0057] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A crude phthalic anhydride heating device, comprising a protective cover (2) fixedly mounted on a heating kettle (1), characterized in that: Also includes: An electric heating rod (4), the electric heating rod (4) being mounted on the heating kettle (1) via a rotating rod (3), and a shaking component being mounted between the rotating rod (3) and the heating kettle (1); an energizing component cooperating with the rotating rod (3) being mounted on the heating kettle (1), the energizing component being used to supply power to the rotating rod (3) so that the electric heating rod (4) heats the crude phthalic anhydride; and a scraping component cooperating with the shaking component being mounted in the heating kettle (1); A driving unit, the driving unit is used to drive the rotation of the rotating rod (3), the driving unit comprising a motor (14) fixedly mounted on the protective cover (2), the output end of the motor (14) being fixedly connected to a driving rod (15), and a connecting assembly being installed between the driving rod (15) and the rotating rod (3); A dehumidification section, the dehumidification section is used to extract moisture from the heating kettle (1), the dehumidification section comprises an extraction seat (18) fixedly mounted on the heating kettle (1), a one-way exhaust pipe (19) fixedly connected between the extraction seat (18) and the heating kettle (1), a one-way discharge pipe (20) fixedly connected to the extraction seat (18), a reciprocating suction component mounted on the extraction seat (18), the reciprocating suction component being used to extract water vapor from the heating kettle (1), and a transmission component cooperating with the drive rod (15) mounted on the extraction seat (18); A switching part, the switching part comprising an electric telescopic rod (25) fixedly mounted on the protective cover (2), wherein the output end of the electric telescopic rod (25) is fixedly connected to a connecting rod (26) that cooperates with the power supply component, and a contact component that cooperates with the transmission component is mounted on the connecting rod (26), and the contact component cooperates with the reciprocating suction component and the vibration drop component; The power supply assembly comprises a power connection ring (6) and a resistor (7) fixedly mounted on the heating kettle (1); a conductive rod (8) is fixedly mounted on the resistor (7); the conductive rod (8) and the resistor (7) are electrically connected to the power connection ring (6) via an electric wire; a power supply ring (5) in contact with the power connection ring (6) is fixedly mounted on the rotating rod (3); a conductive ring (9) is slidably mounted on the resistor (7); a fixing rod (27) is fixedly mounted between the conductive ring (9) and the connecting rod (26); The shaking assembly comprises a fixed ring (10) fixedly mounted on a rotating rod (3); a cylindrical groove (11) matching with the fixed ring (10) is provided in the heating kettle (1), and a moving ring (13) is slidably mounted in the cylindrical groove (11); a plurality of springs (12) are mounted between the bottom of the moving ring (13) and the cylindrical groove (11); two sliding blocks (44) are fixedly mounted on the side wall of the moving ring (13); and two sliding grooves matching with the corresponding sliding blocks (44) are provided on the side wall of the cylindrical groove (11); The connecting assembly comprises a cross rod (16) fixedly mounted on the bottom of the driving rod (15); a cross groove (17) is provided on the top of the rotating rod (3) and is slidably matched with the cross rod (16); the depth of the cross groove (17) is greater than the depth of the cylindrical groove (11); and a convex ring (21) is fixedly mounted on the side wall of the rotating rod (3); A support rod (22) is fixedly mounted on the side wall of the extraction seat (18), and a rotating shaft (23) is rotatably mounted on the support rod (22); a convex rod (24) matching with the convex ring (21) is fixedly mounted on the side wall of the rotating shaft (23), and the length of the convex rod (24) is less than or equal to the depth of the cylindrical groove (11); The reciprocating suction assembly comprises a reciprocating screw which is rotatably mounted on an extraction seat (18), and a piston plate is threadedly mounted on one end of the reciprocating screw located in the extraction seat (18), and a through hole is provided at one end of the extraction seat (18) which is away from the one-way suction pipe (19) and the one-way discharge pipe (20); The transmission assembly comprises a driving bevel gear (33) fixedly mounted on the driving rod (15); a support rod is fixedly mounted on the side wall of the extraction seat (18); a round rod is rotatably mounted on the support rod; a driven bevel gear (34) meshing with the driving bevel gear (33) is fixedly mounted on the round rod; and a driving gear (35) is fixedly mounted on one end of the round rod away from the driven bevel gear (34); The contact assembly comprises two mounting rods (28) fixedly mounted on the fixing rod (27), and a first gear (29) and a second gear (30) are rotatably mounted on one end of the two mounting rods (28) away from the fixing rod (27), respectively, the first gear (29) and the second gear (30) are both matched with a driving gear (35), a first plug rod (31) is fixedly mounted on the first gear (29), a first slot for slidingly matching with the first plug rod (31) is provided on the rotating shaft (23), a second plug rod (32) is fixedly mounted on the second gear (30), and a second slot for slidingly matching with the second plug rod (32) is provided on the reciprocating screw rod.

2. A crude phthalic anhydride heating device according to claim 1, characterized in that: The scraping assembly comprises a sealing ring (38) rotatably mounted in the heating kettle (1), and a sweeping plate (41) and a scraping plate (42) which are in contact with the inner wall of the heating kettle (1) are fixedly mounted on the bottom of the sealing ring (38); an annular groove (36) which is in communication with two slide grooves is provided in the heating kettle (1), and a rotating ring (37) is rotatably mounted in the annular groove (36); a cross bar (39) is fixedly mounted between the rotating ring (37) and the sealing ring (38); a connecting groove (40) which matches the cross bar (39) is provided on the side wall of the annular groove (36); a spiral groove (43) is provided on the inner wall of the rotating ring (37); and a guide block (45) which matches the spiral groove (43) is fixedly mounted on the side wall of one of the sliding blocks (44).

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