A device for recovering benzene anhydride by rectification

Abstract

The utility model relates to a technical field of chemical equipment especially a phthalic anhydride rectification recovery device, including bottom plate, the discharge pipe of distillation kettle is connected with rectifying column fixedly, the right side top of bottom plate is equipped with dismounting mechanism, the inside of dismounting mechanism is equipped with cooling pipe. This phthalic anhydride rectification recovery device, then the staff manually cleans the cooling pipe and first cylinder, by dismounting first cylinder and second cylinder, more convenient for staff to clean the cooling pipe in, by the cooperation of filter mechanism and shell, the heavy component that phthalic anhydride distillation tower comes out is transported to the shell in through the feed inlet on the shell, the impurity on the filter screen moves left and is discharged by the rotation of auger, by filter mechanism, the impurity in the heavy component that phthalic anhydride distillation tower comes out is filtered, reduce the mechanical impurity in heavy component, the problem that is easy to deposit in distillation tower plate or condensation tower spiral pipe.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, specifically to a phthalic anhydride distillation and recovery device. Background Technology

[0002] Phthalic anhydride distillation recovery is a process that uses distillation technology to separate and purify phthalic anhydride from a mixture containing phthalic anhydride, thereby achieving resource recycling.

[0003] For example, a phthalic anhydride recovery device with announcement number "CN220276325U" has a vacuum device installed at the top of the condenser tower. Furthermore, the heavy components at the bottom of the distillation tower enter a heat exchanger for energy recovery, thus effectively recovering phthalic anhydride while improving energy utilization efficiency and reducing energy waste. This invention has advantages such as ingenious structural design, high energy utilization rate, and high phthalic anhydride recovery rate. However, in the aforementioned device, the spiral condensation pipe of the condenser tower may become clogged due to phthalic anhydride crystallization or impurities in the heavy components. The condenser pipe is also difficult to clean inside the condenser tower. Additionally, the device does not filter the raw material, and the heavy components may contain mechanical impurities that easily deposit in the distillation tower plates or the spiral pipe of the condenser tower. Utility Model Content

[0004] The purpose of this invention is to solve the problems of the above-mentioned devices, where the spiral condensation pipes of the condensation tower may become clogged due to phthalic anhydride crystallization or impurities in the heavy components, making cleaning of the condensation pipes inside the condensation tower inconvenient. Furthermore, the above-mentioned devices do not filter the raw materials, and the heavy components may contain mechanical impurities that easily deposit in the distillation trays or the spiral pipes of the condensation tower. Therefore, this invention provides a phthalic anhydride distillation and recovery device.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A phthalic anhydride distillation recovery device is designed, including a base plate. From left to right, a shell, a water pump, a distillation kettle, and a distillation column are fixedly connected to the upper end of the base plate. A filtration mechanism is provided inside the shell. The discharge pipe of the distillation kettle is fixedly connected to the distillation column. A disassembly mechanism is provided on the upper right side of the base plate. A cooling pipe is provided inside the disassembly mechanism.

[0007] This design, with the inner wall of the casing tilted, facilitates water flow to the right and makes it easier for the water pump to absorb the water.

[0008] Preferably, the two ends of the water pump are fixedly connected to the distillation vessel and the outer casing, respectively.

[0009] Preferably, the filtration mechanism includes a motor and a cavity, the output shaft of the motor is fixedly connected to an auger, the rotating shaft of the auger is rotatably connected to the outer shell through a bearing, the outer wall of the auger is in contact with the filter screen, and the outer wall of the filter screen is mounted on the outer shell.

[0010] This setting allows the filter to be removed.

[0011] Preferably, the cavity is machined inside the outer casing, and the outer wall of the motor is threadedly connected to the outer casing by bolts.

[0012] Preferably, the disassembly mechanism includes a first cylinder and a second cylinder. An annulus is fixedly connected to the upper end of the first cylinder. A groove is machined on the inner wall of the second cylinder. The outer wall of the annulus is inserted into the groove. Flanges are fixedly connected to the outer walls of both the first cylinder and the second cylinder.

[0013] This design, with its angled surface, makes it easier for the ring to fit into the groove.

[0014] Preferably, the flange is connected by bolts and threads, a cooling pipe is fixedly connected to the inner wall of the first cylinder, and the inner wall of the first cylinder is fixedly connected to the distillation column through a condenser pipe.

[0015] The phthalic anhydride distillation and recovery device proposed in this utility model has the following advantages:

[0016] With the cooperation of the disassembly mechanism and the base plate, the workers use tools to loosen the bolts on the flange to disassemble it. The workers then use tools such as cranes to cooperate with the threaded holes machined on the second cylinder to separate the second cylinder from the first cylinder. Afterwards, the workers manually clean the cooling pipes and the first cylinder. By disassembling the first and second cylinders, it is easier for the workers to clean the internal cooling pipes.

[0017] Through the cooperation of the filtration mechanism and the outer shell, the heavy components from the phthalic anhydride distillation tower are transported into the outer shell through the feed inlet. The heavy components from the phthalic anhydride distillation tower are filtered by the filter screen and flow into the cavity. The filter screen removes impurities from the heavy components from the phthalic anhydride distillation tower. Then, the operator starts the water pump to suck out the heavy components from the phthalic anhydride distillation tower from the cavity and transport them into the distillation kettle. The motor is started, and the output shaft of the motor rotates, driving the auger to rotate. The rotation of the auger causes the impurities on the filter screen to move to the left and be discharged. The filtration mechanism filters out the impurities in the heavy components from the phthalic anhydride distillation tower, reducing the problem of mechanical impurities in the heavy components easily depositing in the distillation tower plates or the spiral pipes of the condenser tower. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2for Figure 1 A front sectional view;

[0020] Figure 3 This is a sectional view of the second cylinder.

[0021] Figure 4 This is a partial left-side sectional view of the outer casing;

[0022] Figure 5 for Figure 2 Schematic diagram of part A in the middle;

[0023] Figure 6 for Figure 2 Schematic diagram of part B in the middle section.

[0024] In the diagram: 1. Base plate, 2. Outer shell, 3. Filtering mechanism, 301. Motor, 302. Screwdriver, 303. Filter screen, 304. Cavity, 4. Water pump, 5. Distillation kettle, 6. Distillation column, 7. Disassembly mechanism, 701. First cylinder, 702. Second cylinder, 703. Ring, 704. Groove, 705. Flange, 8. Cooling pipe. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings:

[0026] See attached document Figure 1-6 :

[0027] In this embodiment, a phthalic anhydride distillation recovery device includes a base plate 1. The upper end of the base plate 1 is fixedly connected from left to right to a shell 2, a water pump 4, a distillation kettle 5, and a distillation column 6. The shell 2 is equipped with a filter mechanism 3 inside. The discharge pipe of the distillation kettle 5 is fixedly connected to the distillation column 6.

[0028] The preheated raw material in the distillation kettle 5 enters the distillation column 6 through the discharge pipe. A disassembly mechanism 7 is provided on the upper right side of the bottom plate 1. A cooling pipe 8 is provided inside the disassembly mechanism 7. The two ends of the water pump 4 are fixedly connected to the distillation kettle 5 and the outer shell 2, respectively.

[0029] See attached document Figure 1-3 And 5:

[0030] The filter mechanism 3 includes a motor 301 and a cavity 304. The output shaft of the motor 301 is fixedly connected to an auger 302. The rotation of the output shaft of the motor 301 drives the auger 302 to rotate. The rotating shaft of the auger 302 is rotatably connected to the outer shell 2 through a bearing. The outer wall of the auger 302 is in contact with the filter screen 303. The rotation of the auger 302 drives the waste material on the filter screen 330 to move.

[0031] The outer wall of the filter screen 303 is installed on the outer casing 2. The filter screen 303 is removable. The cavity 304 is machined inside the outer casing 2. The filtered raw materials can be temporarily stored inside the cavity 304. The outer wall of the motor 301 is threadedly connected to the outer casing 2 by bolts.

[0032] See attached document Figure 1-2 and 4, 6:

[0033] The disassembly mechanism 7 includes a first cylinder 701 and a second cylinder 702. The upper end of the first cylinder 701 is fixedly connected to a ring 703. The ring 703 is triangular to facilitate the ring 703 entering the groove 704. The inner wall of the second cylinder 702 is machined with a groove 704, and the outer wall of the ring 703 is inserted into the groove 704.

[0034] Flanges 705 are fixedly connected to the outer walls of both the first cylinder 701 and the second cylinder 702. The flanges 705 are connected by bolts and threads. Cooling pipes 8 are fixedly connected to the inner wall of the first cylinder 701. The inner wall of the first cylinder 701 is fixedly connected to the distillation column 6 through condenser pipes.

[0035] Working principle:

[0036] When staff recover phthalic anhydride by distillation.

[0037] Work process:

[0038] The operator delivers the heavy component from the phthalic anhydride distillation tower into the outer shell 2 through the feed inlet on the outer shell 2. The heavy component from the phthalic anhydride distillation tower is filtered by the filter screen 303 and flows into the cavity 304. The filter screen 303 removes impurities from the heavy component from the phthalic anhydride distillation tower. Then, the operator starts the water pump 4 to suck out the heavy component from the phthalic anhydride distillation tower in the cavity 304 and deliver it into the distillation kettle 5. The operator starts the motor 301, and the output shaft of the motor 301 rotates, driving the auger 302 to rotate. The rotation of the auger 302 causes the impurities on the filter screen 303 to move to the left and be discharged.

[0039] The heavy components from the phthalic anhydride distillation tower enter the distillation kettle 5 for preheating, and then enter the rectification tower 6 through the discharge pipe for negative pressure distillation. The vaporized components enter the first cylinder 701 through the condenser pipe. The cooling pipe 8 is activated to cool the vaporized components into water. After condensation, the staff places the collection tank at the lower end of the first cylinder 701 for collection.

[0040] When cleaning is required, the staff uses tools to loosen the bolts on flange 705 to remove it. The staff then uses a crane or other tools to connect the second cylinder 702 to the threaded hole machined on the first cylinder 701. After that, the staff manually cleans the cooling pipe 8 and the first cylinder 701, and then reinstalls them. The working principle is the opposite of the above. The inspection door on the outer shell 2 is used to inspect the filter screen 303 and the auger 302. The air inlet pipe on the second cylinder 702 is used to connect to an external vacuum pump and is equipped with a valve. The external vacuum pump creates a vacuum environment inside the device.

[0041] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A phthalic anhydride distillation and recovery apparatus, comprising a bottom plate (1), characterized in that: The upper end of the base plate (1) is fixedly connected from left to right to the outer shell (2), water pump (4), distillation kettle (5) and distillation column (6). The inner part of the outer shell (2) is provided with a filter mechanism (3). The discharge pipe of the distillation kettle (5) is fixedly connected to the distillation column (6). The upper right side of the base plate (1) is provided with a disassembly mechanism (7). The inside of the disassembly mechanism (7) is provided with a cooling pipe (8).

2. The phthalic anhydride distillation and recovery apparatus according to claim 1, characterized in that: The two ends of the water pump (4) are fixedly connected to the distillation vessel (5) and the outer shell (2), respectively.

3. The phthalic anhydride distillation and recovery apparatus according to claim 1, characterized in that: The filter mechanism (3) includes a motor (301) and a cavity (304). The output shaft of the motor (301) is fixedly connected to an auger (302). The rotating shaft of the auger (302) is rotatably connected to the outer shell (2) through a bearing. The outer wall of the auger (302) is in contact with the filter screen (303). The outer wall of the filter screen (303) is mounted on the outer shell (2).

4. The phthalic anhydride distillation and recovery apparatus according to claim 3, characterized in that: The cavity (304) is machined inside the outer shell (2), and the outer wall of the motor (301) is threadedly connected to the outer shell (2) by bolts.

5. The phthalic anhydride distillation and recovery apparatus according to claim 1, characterized in that: The disassembly mechanism (7) includes a first cylinder (701) and a second cylinder (702). The upper end of the first cylinder (701) is fixedly connected to a ring (703). The inner wall of the second cylinder (702) is machined with a groove (704). The outer wall of the ring (703) is inserted into the groove (704). The outer walls of the first cylinder (701) and the second cylinder (702) are both fixedly connected to flanges (705).

6. The phthalic anhydride distillation and recovery apparatus according to claim 5, characterized in that: The flange (705) is connected by bolt threads. The inner wall of the first cylinder (701) is fixedly connected to a cooling pipe (8). The inner wall of the first cylinder (701) is fixedly connected to the distillation column (6) through a condenser pipe.

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