The utility model relates to a method for preparing 4, 4apos; methyl-dimethoxyacetoacetate production tail gas treatment and recovery device

Abstract

The utility model provides a methyl 4, 4 '-dimethoxy acetoacetate production tail gas treatment and recovery device which comprises a first connecting pipe, the tail end of the first connecting pipe is fixedly connected with a first disc, the bottom surface of the first disc is fixedly connected with a condenser, the tail end of the condenser is fixedly connected with a second disc, and the second disc is fixedly connected with a second connecting pipe. A water inlet is fixedly formed in the top of the surface of the condenser, a water outlet is fixedly formed in the bottom of the surface of the condenser, and a second connecting pipe is fixedly connected to the tail end of the second disc. And the top surface of the second connecting pipe is fixedly connected with a cylinder. Compared with the prior art, the gas recovery device has the advantages that firstly, the nut is rotated, the threaded rod and the bottom plate are moved, the first bolt is taken down, then the cylinder is rotated, the baffle is separated from the clamping groove, and then the top of the second cylinder makes contact with the tail end of the second disc, so that the gas recovery efficiency cannot be affected when a single filter screen is detached.

Description

Technical Field

[0001] This invention relates to a device for treating and recovering tail gas from the production of methyl 4,4'-dimethoxyacetoacetate, belonging to the field of tail gas treatment and recovery. Background Technology

[0002] 4,4'-Dimethoxyacetoacetate methyl ester is an organic compound and a commonly used reagent in organic synthesis. It belongs to the ester class of compounds. As an ester, it exhibits some volatility, and its melting and boiling points are affected by intermolecular forces. This compound may be used in the synthesis of pharmaceuticals, pesticides, dyes, fragrances, or other polymeric materials and fine chemicals. 4,4'-Dimethoxyacetoacetate methyl ester is irritating; protective gloves and safety glasses should be worn during use to avoid inhalation, chewing, or ingestion. During storage, it should be kept away from fire and alkaline substances. Waste disposal should be carried out in accordance with environmental protection guidelines.

[0003] In existing technologies, the production of methyl 4,4'-dimethoxyacetoacetate generates gas, necessitating gas recovery and treatment. During the recovery of evaporated gas, it condenses into droplets as it passes through the pipeline. Given the high temperature of the gas, a condenser is required to cool it during pipeline transport. The condensed liquid crystallizes during cooling (primarily a solid formed by the arrangement of methyl 4,4'-dimethoxyacetoacetate molecules in a specific crystal lattice structure; the crystallized product also contains small amounts of solvent molecules, unreacted raw materials, and byproducts). Therefore, further processing is required. The liquid cooled by the condenser is filtered. To prevent crystals from accumulating on the inner wall of the glass tube after cooling, a filter screen is used. However, the filter screen can cause crystals to accumulate on the screen, which can affect the collection of liquid over time. Therefore, the filter screen needs to be cleaned. This requires stopping the production of methyl 4,4'-dimethoxyacetoacetate and removing the filter screen for cleaning. However, when removing the filter screen, the liquid remaining in the pipe drips down, resulting in material waste and affecting the efficiency of treating methyl 4,4'-dimethoxyacetoacetate gas, which is very inconvenient. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a tail gas treatment and recovery device for the production of methyl 4,4'-dimethoxyacetoacetate, so as to solve the problems mentioned in the background art. This utility model can make it possible to disassemble a single filter screen without affecting the gas recovery efficiency.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a device for treating and recovering tail gas from the production of methyl 4,4'-dimethoxyacetoacetate, comprising a first connecting pipe, a first disc fixedly connected to the end of the first connecting pipe, a condenser fixedly connected to the bottom surface of the first disc, a second disc fixedly connected to the end of the condenser, a water inlet fixedly arranged at the top surface of the condenser, a water outlet fixedly arranged at the bottom surface of the condenser, and a second connecting pipe fixedly connected to the end of the second disc;

[0006] A cylinder is fixedly connected to the top surface of the second connecting pipe. A circular groove is formed inside the cylinder. A protrusion is fixedly arranged at the top of the circular groove. A filter screen is fixedly arranged at the end of the cylinder. A base plate is movably connected to the top of the cylinder. A slot is formed on the surface of the cylinder. A circular block is fixedly installed on the surface of the cylinder. A first bolt is threadedly connected to the surface of the circular block. A groove is formed inside the bottom surface of the cylinder. A baffle is fixedly connected to the top side of the cylinder. A threaded rod is fixedly connected to the bottom surface of the first disc. A nut is threadedly connected to the surface of the threaded rod. A sealing strip is fixedly arranged on the surface of the cylinder.

[0007] Furthermore, three cylinders are arranged at equal intervals at the connection between the condenser and the second connecting pipe. The three cylinders are arranged in an alternating manner, with the baffle at the top of one cylinder fitting into the slot of another cylinder, and the protrusion contacting the groove.

[0008] Furthermore, the first bolt passes through the surface of the round block and the cylinder and contacts the baffle inside the slot. The top of each cylinder corresponds to the position of the filter screen of another cylinder, and the sealing strip covers the connection of each cylinder.

[0009] Furthermore, a retaining ring is fixedly arranged on the top of the second disc, a fixing block is fixedly arranged on the top of the retaining ring, a second bolt is threadedly connected to the surface of the fixing block, a retaining block is fixedly connected to the side of the retaining ring, a bottom ring is fixedly installed on the bottom surface of the second disc, and a receiving block is fixedly connected to the end of the retaining block.

[0010] Furthermore, two retaining rings are symmetrically arranged on the top surface of the second disk, with their ends in contact. A fixing block is arranged at the top of the contact position of the retaining ring ends, and a second bolt at the top of the fixing block passes through the fixing block and connects to the two retaining rings respectively.

[0011] Furthermore, two receiving blocks are symmetrically arranged on the side of the bottom ring. The bottom surface of the receiving block is fixedly connected to the threaded rod, and the center of the locking block is fitted with the surface shape of the second disc.

[0012] The beneficial effects of this utility model are as follows: First, rotate the nut, move the position of the threaded rod and the base plate, remove the first bolt, then rotate the cylinder, the baffle disengages from the slot, and then the top of the second cylinder contacts the end of the second disc. In this way, the gas recovery efficiency will not be affected when disassembling a single filter screen.

[0013] Secondly, the retaining ring needs to be placed on the top of the second disc, while the fixing block is located at the connection between the two retaining rings. The second bolt fixes the retaining ring to the top of the second disc. The receiving block at the end of the retaining block contacts the top of the threaded rod. The bottom ring is located on the bottom surface of the second disc, and the bottom ring fixes the receiving blocks at both ends. This makes the threaded rod more stable when it is at the bottom of the second disc. Attached Figure Description

[0014] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0015] Figure 1 This is a schematic diagram of the overall structure of a tail gas treatment and recovery device for the production of methyl 4,4'-dimethoxyacetoacetate according to the present invention.

[0016] Figure 2 This is a schematic diagram of the main view of a device for treating and recovering tail gas from the production of methyl 4,4'-dimethoxyacetoacetate according to the present invention.

[0017] Figure 3 This is a schematic diagram of the cylindrical three-dimensional structure of a tail gas treatment and recovery device for the production of methyl 4,4'-dimethoxyacetoacetate according to this utility model.

[0018] In the diagram: 1. First connecting pipe; 2. First disc; 201. Condenser; 3. Second disc; 301. Inlet; 302. Outlet; 303. Second connecting pipe; 4. Cylinder; 401. Circular groove; 402. Protrusion; 403. Filter screen; 404. Base plate; 5. Slot; 501. Circular block; 502. First bolt; 503. Groove; 504. Baffle; 6. Threaded rod; 601. Nut; 602. Sealing strip; 7. Snap ring; 701. Fixing block; 702. Second bolt; 8. Clip; 801. Bottom ring; 802. Receiving block. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0020] Please see Figures 1 to 3This utility model provides a technical solution: a device for treating and recovering tail gas from the production of methyl 4,4'-dimethoxyacetoacetate, comprising a first connecting pipe 1, a first disc 2 fixedly connected to the end of the first connecting pipe 1, a condenser 201 fixedly connected to the bottom surface of the first disc 2, a second disc 3 fixedly connected to the end of the condenser 201, a water inlet 301 fixedly arranged on the top surface of the condenser 201, a water outlet 302 fixedly arranged on the bottom surface of the condenser 201, and a second connecting pipe 303 fixedly connected to the end of the second disc 3; three cylinders 4 are arranged at equal intervals at the connection between the condenser 201 and the second connecting pipe 303, the three cylinders 4 are arranged in an alternating manner, the baffle 504 on the top of one cylinder 4 fits into the slot 5 of another cylinder 4, and at the same time the protrusion 402 contacts the groove 503. The first bolt 502 passes through the surface of the round block 501 and the cylinder 4 and contacts the baffle 504 inside the slot 5. The top of each cylinder 4 corresponds to the position of the filter screen 403 of another cylinder 4. The sealing strip 602 covers the connection of each cylinder 4.

[0021] The top surface of the second connecting pipe 303 is fixedly connected to a cylinder 4. A circular groove 401 is opened inside the cylinder 4. A protrusion 402 is fixedly arranged on the top of the circular groove 401. A filter screen 403 is fixedly arranged at the end of the cylinder 4. A base plate 404 is movably connected to the top of the cylinder 4. A slot 5 is opened on the surface of the cylinder 4. A circular block 501 is fixedly installed on the surface of the cylinder 4. A first bolt 502 is threadedly connected to the surface of the circular block 501. A groove 503 is opened inside the bottom surface of the cylinder 4. A baffle 504 is fixedly connected to the top side of the cylinder 4. A threaded rod 6 is fixedly connected to the bottom surface of the first disc 2. A nut 601 is threadedly connected to the surface of the threaded rod 6. A sealing strip 602 is fixedly arranged on the surface of the cylinder 4.

[0022] Please see Figures 1 to 2 A retaining ring 7 is fixedly arranged on the top of the second disc 3, a fixing block 701 is fixedly arranged on the top of the retaining ring 7, a second bolt 702 is threadedly connected to the surface of the fixing block 701, a retaining block 8 is fixedly connected to the side of the retaining ring 7, a bottom ring 801 is fixedly installed on the bottom surface of the second disc 3, and a receiving block 802 is fixedly connected to the end of the retaining block 8.

[0023] Two retaining rings 7 are symmetrically arranged on the top surface of the second disc 3, with their ends in contact. A fixing block 701 is arranged on the top of the contact position of the ends of the retaining rings 7. The second bolt 702 on the top of the fixing block 701 passes through the fixing block 701 and is connected to the two retaining rings 7 respectively. Two receiving blocks 802 are symmetrically arranged on the side of the bottom ring 801. The bottom surface of the receiving block 802 is fixedly connected to the threaded rod 6, and the center of the retaining block 8 conforms to the surface shape of the second disc 3.

[0024] Detailed implementation: First, when it is necessary to ensure that the gas recovery efficiency is not affected when removing a single filter screen 403, the cylinder 4 needs to be installed at the bottom end of the second disc 3, so that the baffle 504 at the top of the other cylinder 4 contacts the groove 5 on the surface of the cylinder 4 at the bottom end of the second disc 3, and at the same time, the protrusion 402 at the top of the other cylinder 4 contacts the groove 503 at the end of the cylinder 4 at the bottom end of the second disc 3. Then, rotate the position of the other cylinder 4 so that the baffle 504 corresponds to the position of the first bolt 502, and then use the first bolt 502 to fix the position of the baffle 504. The joints of each cylinder 4 are sealed with sealing strip 602, and the nut 601 fixes the threaded rod 6 and the base plate 404 to the end of the cylinder 4. When the filter screen 403 of the first cylinder 4 is full, by rotating the nut 601, the position of the threaded rod 6 and the base plate 404 can be moved, the first bolt 502 can be removed, and the position of the cylinder 4 can be rotated so that the baffle 504 is disengaged from the position of the slot 5. Then the top of the second cylinder 4 contacts the end of the second disc 3. In this way, the gas recovery efficiency is not affected when disassembling a single filter screen 403.

[0025] Secondly, when it is necessary to make the position of the threaded rod 6 more stable on the bottom surface of the second disk 3, the retaining ring 7 needs to be placed on the top of the second disk 3, while the fixing block 701 is located at the connection of the two retaining rings 7. At the same time, the retaining ring 7 is fixed on the top of the second disk 3 using the second bolt 702. At this time, the receiving block 802 at the end of the retaining block 8 contacts the top of the threaded rod 6, and the bottom ring 801 is located on the bottom surface of the second disk 3. The bottom ring 801 fixes the receiving blocks 802 at both ends. In this way, the threaded rod 6 can be more stable when it is at the bottom of the second disk 3.

[0026] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A device for treating and recovering tail gas from the production of methyl 4,4'-dimethoxyacetoacetate, comprising a first connecting pipe (1), characterized in that: The first connecting pipe (1) is fixedly connected to the end of a first disc (2), the bottom surface of the first disc (2) is fixedly connected to a condenser (201), the end of the condenser (201) is fixedly connected to a second disc (3), the top surface of the condenser (201) is fixedly arranged with an inlet (301), the bottom surface of the condenser (201) is fixedly arranged with an outlet (302), and the end of the second disc (3) is fixedly connected to a second connecting pipe (303). The top surface of the second connecting pipe (303) is fixedly connected to a cylinder (4). The inside of the cylinder (4) is provided with a circular groove (401). A protrusion (402) is fixedly arranged on the top of the circular groove (401). A filter screen (403) is fixedly arranged at the end of the cylinder (4). A base plate (404) is movably connected to the top of the cylinder (4). A slot (5) is provided on the surface of the cylinder (4). A circular block (501) is fixedly installed on the surface of the cylinder (4). A first bolt (502) is threadedly connected to the surface of the circular block (501). A groove (503) is provided inside the bottom surface of the cylinder (4). A baffle (504) is fixedly connected to the top side of the cylinder (4). A threaded rod (6) is fixedly connected to the bottom surface of the first disc (2). A nut (601) is threadedly connected to the surface of the threaded rod (6). A sealing strip (602) is fixedly arranged on the surface of the cylinder (4).

2. The device for treating and recovering tail gas from the production of methyl 4,4'-dimethoxyacetoacetate according to claim 1, characterized in that: Three cylinders (4) are arranged at equal intervals at the connection between the condenser (201) and the second connecting pipe (303). The three cylinders (4) are arranged in an alternating manner. The baffle (504) on the top of one cylinder (4) fits into the slot (5) of another cylinder (4), while the protrusion (402) contacts the groove (503).

3. The device for treating and recovering tail gas from the production of methyl 4,4'-dimethoxyacetoacetate according to claim 1, characterized in that: The first bolt (502) passes through the round block (501) and the surface of the cylinder (4) contacts the baffle (504) inside the slot (5). The top of each cylinder (4) corresponds to the position of the filter screen (403) of another cylinder (4). The sealing strip (602) covers the connection of each cylinder (4).

4. The device for treating and recovering tail gas from the production of methyl 4,4'-dimethoxyacetoacetate according to claim 1, characterized in that: A retaining ring (7) is fixedly arranged on the top of the second disc (3), and a fixing block (701) is fixedly arranged on the top of the retaining ring (7). A second bolt (702) is threadedly connected to the surface of the fixing block (701). A retaining block (8) is fixedly connected to the side of the retaining ring (7). A bottom ring (801) is fixedly installed on the bottom surface of the second disc (3). A receiving block (802) is fixedly connected to the end of the retaining block (8).

5. The device for treating and recovering tail gas from the production of methyl 4,4'-dimethoxyacetoacetate according to claim 4, characterized in that: Two retaining rings (7) are symmetrically arranged on the top surface of the second disk (3). The two ends of the two retaining rings (7) are in contact with each other. A fixing block (701) is arranged on the top of the contact position of the end of the retaining ring (7). The second bolt (702) on the top of the fixing block (701) passes through the fixing block (701) and is connected to the two retaining rings (7).

6. The device for treating and recovering tail gas from the production of methyl 4,4'-dimethoxyacetoacetate according to claim 4, characterized in that: The bottom ring (801) has two symmetrically arranged receiving blocks (802) on its side. The bottom surface of the receiving block (802) is fixedly connected to the threaded rod (6), and the center of the locking block (8) fits the surface shape of the second disc (3).

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