Purification device for preparing methyl 4-chloroacetoacetate

Abstract

The utility model relates to the technical field of chemical equipment, in particular to a purification device for preparing methyl 4-chloroacetoacetate. By means of the steam absorption pipe in the purification box, most of generated steam can be conveniently absorbed when an evaporation product is heated, the steam absorption pipe is driven by the electric push rod to move, and the telescopic corrugated pipe is connected to the top end of the steam absorption pipe, so that the steam absorption pipe can move in the purification box, and then steam at different positions in the purification box can be conveniently absorbed; the top end of a moving rod penetrates through a box cover and is slidably inserted into a limiting sleeve, a guide rod is slidably sleeved with a guide block, a steam absorption pipe is conveniently limited, the steam absorption pipe is not prone to inclining, a valve body can be opened through an auxiliary absorption pipe at one end of an auxiliary pipe, and steam at the top of the steam absorption pipe can be absorbed; all generated steam can be conveniently discharged out of the purification box through the connecting pipe, so that a small amount of steam is not easy to remain in the purification box, and the preparation purity of a product is not influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a purification device for preparing methyl 4-chloroacetoacetate. Background Art

[0002] Methyl 4-chloroacetoacetate is a transparent, colorless to pale yellow liquid chemical substance. It is an intermediate in organic synthesis or a pharmaceutical raw material intermediate. When storing, the container must be kept sealed and stored in a cool, dry place. Ensure that the workshop has good ventilation or exhaust devices.

[0003] In the prior art, methyl 4-chloroacetoacetate is usually produced by a batch process. Diketene is dissolved in a solvent, cooled and stirred, and a certain amount of chlorine is introduced into a reactor at a certain flow rate. After the chlorination reaction is completed, a certain amount of methanol is added dropwise. After the esterification reaction is completed, it is neutralized with an alkali, and the solvent is evaporated. Then, it is distilled under reduced pressure to obtain a colorless liquid product, namely methyl 4-chloroacetoacetate. In order to improve the purity of the product, it is generally purified in a purification tank by distillation.

[0004] However, during the process of heating, evaporating and purifying the product in the purification box, it is difficult for all the generated steam to be discharged from the purification box through the connecting pipe, resulting in a small amount of steam remaining in the purification box, affecting the preparation purity of the product. Utility Model Content

[0005] The purpose of the utility model is to provide a purification device for preparing methyl 4-chloroacetoacetate to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a purification device for preparing methyl 4-chloroacetoacetate, comprising: a purification box, a box cover installed at the top of the purification box, a steam absorption pipe provided inside the purification box, a connecting pipe installed near the top of the steam absorption pipe on the box cover, and a telescopic bellows connecting the steam absorption pipe and the connecting pipe;

[0007] Two auxiliary pipes are fixedly installed on the outer wall of one end of the steam absorption pipe close to the connecting pipe, and the ends of the two auxiliary pipes close to the steam absorption pipe are both provided with valve bodies, and the other ends of the two auxiliary pipes are both fixedly installed with auxiliary absorption pipes;

[0008] An electric push rod is connected to the top of one end of the steam absorption tube, a moving rod is installed on the top of the other end of the steam absorption tube, a limiting sleeve is installed near the top of the moving rod on the box cover, and the top of the moving rod passes through the box cover and is slidably inserted into the limiting sleeve;

[0009] Guide blocks are installed on the outer walls of both ends of the steam absorption pipe, and the bottom ends of the box cover close to the two guide blocks are connected to guide rods, and the two guide blocks are slidably sleeved on adjacent guide rods.

[0010] Preferably, a feed pipe is fixedly installed on the top outer wall of the purification box, one end of the feed pipe passes through the purification box and is inserted into the interior of the purification box, and the end of the feed pipe located inside the purification box does not contact the steam absorption pipe, and the bottom end of the purification box is connected to the discharge pipe.

[0011] Preferably, the bottom end of the steam absorption pipe is trumpet-shaped, and the top end of the steam absorption pipe is fixedly connected to the telescopic bellows.

[0012] Preferably, the connecting pipe is fixedly mounted on the box cover and an extraction pump is provided at one end close to the box cover, and the top end of the telescopic bellows is fixedly connected to the bottom end of the connecting pipe.

[0013] Preferably, the two auxiliary tubes are symmetrically arranged and are both arc-shaped, one end of the two auxiliary tubes is connected to the top of the steam absorption tube, the other end of the two auxiliary tubes is connected to the auxiliary absorption tube, and the two auxiliary absorption tubes are both trumpet-shaped.

[0014] Preferably, the electric push rod and the moving rod are symmetrically arranged on both sides of the telescopic bellows, the electric push rod is fixedly installed on the top of the box cover, and the output end of the electric push rod passes through the box cover and is fixedly connected to the steam absorption pipe.

[0015] Preferably, the limit sleeve is fixedly mounted on the box cover, four limit blocks are fixedly mounted on the top side wall of the movable rod, four limit grooves are correspondingly opened on the inner wall of the limit sleeve close to the four limit blocks, and the four limit blocks are slidably connected to the inner walls of adjacent limit grooves.

[0016] Preferably, the two guide rods are symmetrically arranged, and a fixing plate is fixedly installed on the inner wall of the purification box near the two guide rods. The top ends of the two guide rods are fixedly connected to the box cover, and the bottom ends of the two guide rods are fixedly installed on adjacent fixing plates.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The utility model uses the steam absorption tube in the purification box to absorb most of the steam generated when the evaporation product is heated. The steam absorption tube is driven to move by the electric push rod, and a telescopic bellows is connected to the top of the steam absorption tube, so that the steam absorption tube can be moved in the purification box, thereby facilitating the absorption of steam at different positions in the purification box. The top of the moving rod is passed through the box cover and slidably inserted into the limit sleeve, and the guide block is slidably sleeved on the guide rod, so that the steam absorption tube is limited and the steam absorption tube is not easily tilted. The auxiliary absorption tube at one end of the auxiliary tube can open the valve body to absorb the steam at the top of the steam absorption tube, so that all the generated steam is discharged from the purification box through the connecting tube, so that it is not easy for a small amount of steam to remain in the purification box, so as not to affect the preparation purity of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a three-dimensional cross-sectional diagram of the overall structure of the utility model;

[0021] Figure 3 For this utility model Figure 2 A schematic diagram of the structure at center A;

[0022] Figure 4 For this utility model Figure 2 A magnified schematic diagram of the structure at point B in the middle;

[0023] Figure 5 It is a three-dimensional schematic diagram of the steam absorption tube of the present utility model.

[0024] In the figure: 1. Purification box; 2. Feed pipe; 3. Discharge pipe; 4. Electric push rod; 5. Steam absorption pipe; 6. Connecting pipe; 7. Telescopic bellows; 8. Extraction pump; 9. Auxiliary pipe; 10. Valve body; 11. Auxiliary absorption pipe; 12. Box cover; 13. Fixed plate; 14. Guide rod; 15. Guide block; 16. Moving rod; 17. Limit sleeve; 18. Limit block; 19. Limit groove. DETAILED DESCRIPTION

[0025] In order to clearly and completely describe the purpose and technical solution of the present invention and make its advantages more clearly understood, the following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention and are not intended to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] See also Figures 1 to 5 The present invention provides a technical solution: a purification device for preparing methyl 4-chloroacetoacetate, comprising: a purification box 1, a box cover 12 installed at the top of the purification box 1, a steam absorption pipe 5 provided inside the purification box 1, a connecting pipe 6 installed near the top of the box cover 12 near the top of the steam absorption pipe 5, and a telescopic bellows 7 connecting the steam absorption pipe 5 and the connecting pipe 6; a feed pipe 2 fixedly installed on the top outer wall of the purification box 1, one end of the feed pipe 2 passing through the purification box 1 and inserted into the interior of the purification box 1, and the end of the feed pipe 2 located inside the purification box 1 does not contact the steam absorption pipe 5; a discharge pipe 3 connected to the bottom end of the purification box 1, facilitating the product to be fed into the purification box 1 through the feed pipe 2 for heating and purification, and the purified product can be discharged through the discharge pipe 3. The bottom end of the steam absorption pipe 5 is trumpet-shaped, and the top end of the steam absorption pipe 5 is fixedly connected to the telescopic bellows 7, so that the steam absorption pipe 5 can move up and down within the length of the telescopic bellows 7. The connecting pipe 6 is fixedly mounted on the box cover 12 and an extraction pump 8 is provided at one end close to the box cover 12 . The top end of the telescopic bellows 7 and the bottom end of the connecting pipe 6 are fixedly connected to facilitate extraction of steam in the purification box 1 .

[0027] Two auxiliary tubes 9 are fixedly installed on the outer wall of one end of the steam absorption tube 5 close to the connecting tube 6. The two auxiliary tubes 9 are provided with a valve body 10 at one end close to the steam absorption tube 5, and the other ends of the two auxiliary tubes 9 are fixedly installed with an auxiliary absorption tube 11; the two auxiliary tubes 9 are symmetrically arranged and both are arc-shaped, one end of the two auxiliary tubes 9 is connected to the top of the steam absorption tube 5, and the other ends of the two auxiliary tubes 9 are connected to the auxiliary absorption tube 11, and the two auxiliary absorption tubes 11 are both trumpet-shaped, which can absorb the steam at the top of the steam absorption tube 5.

[0028] The top of one end of the steam absorption tube 5 is connected to an electric push rod 4, and the top of the other end of the steam absorption tube 5 is installed at the top of the steam absorption tube 5. A limit sleeve 17 is installed near the top of the mobile rod 16 on the box cover 12. The top of the mobile rod 16 passes through the box cover 12 and slides into the limit sleeve 17. The electric push rod 4 and the mobile rod 16 are symmetrically arranged on both sides of the telescopic bellows 7. The electric push rod 4 is fixedly installed at the top of the box cover 12. The output end of the electric push rod 4 passes through the box cover 12 and is fixedly connected to the steam absorption tube 5. The limit sleeve 17 is fixedly installed on the box cover 12. Four limit blocks 18 are fixedly installed on the top side wall of the mobile rod 16. Four limit grooves 19 are correspondingly opened on the inner wall of the limit sleeve 17 near the four limit blocks 18. The four limit blocks 18 are slidably connected to the inner walls of adjacent limit grooves 19 to facilitate limiting the mobile rod 16, making it difficult for the mobile rod 16 to rotate within the limit sleeve 17, thereby improving the stability of the steam absorption tube 5.

[0029] Guide blocks 15 are installed on the outer walls of both ends of the steam absorption tube 5. Guide rods 14 are connected to the bottom ends of the box cover 12 near the two guide blocks 15. The two guide blocks 15 are slidably sleeved on adjacent guide rods 14. The two guide rods 14 are symmetrically arranged. A fixing plate 13 is fixedly installed on the inner wall of the purification box 1 near the two guide rods 14. The top ends of the two guide rods 14 are fixedly connected to the box cover 12, and the bottom ends of the two guide rods 14 are fixedly installed on the adjacent fixing plates 13. This facilitates the positioning and guidance of the guide holes 15, further improving the stability of the steam absorption tube 5 and preventing the steam absorption tube 5 from shaking due to the thrust of the steam.

[0030] When the device is working, the steam absorption tube 5 in the purification box 1 is used to absorb most of the steam generated when the product is heated and evaporated. The steam absorption tube 5 is driven to move by the electric push rod 4, and a telescopic bellows 7 is connected to the top of the steam absorption tube 5, so that the steam absorption tube 5 can move in the purification box 1, thereby facilitating the absorption of steam at different positions in the purification box 1. The top of the moving rod 16 is passed through the box cover 12 and slidably inserted into the limiting sleeve 17, and the guide block 15 is slidably sleeved on the guide rod 14, so as to limit the steam absorption tube 5 and make it difficult for the steam absorption tube 5 to tilt. Through the auxiliary absorption tube 11 at one end of the auxiliary tube 9, the valve body 10 can be opened to absorb the steam at the top of the steam absorption tube 5, so that all the generated steam is discharged from the purification box 1 through the connecting tube 6, so that it is not easy for a small amount of steam to remain in the purification box 1, so as not to affect the preparation purity of the product.

[0031] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A purification device for preparing methyl 4-chloroacetoacetate, comprising: A purification box (1), characterized in that: a box cover (12) is installed at the top of the purification box (1), a steam absorption pipe (5) is provided inside the purification box (1), a connecting pipe (6) is installed near the top of the box cover (12) near the steam absorption pipe (5), and a telescopic bellows (7) is connected between the steam absorption pipe (5) and the connecting pipe (6); Two auxiliary pipes (9) are fixedly mounted on the outer wall of one end of the steam absorption pipe (5) close to the connecting pipe (6); a valve body (10) is provided at one end of the two auxiliary pipes (9) close to the steam absorption pipe (5); and an auxiliary absorption pipe (11) is fixedly mounted at the other end of the two auxiliary pipes (9); The top of one end of the steam absorption tube (5) is connected to an electric push rod (4), the top of the other end of the steam absorption tube (5) is installed with a moving rod (16), the top of the box cover (12) is installed with a limiting sleeve (17) near the top of the moving rod (16), and the top of the moving rod (16) passes through the box cover (12) and is slidably inserted into the limiting sleeve (17); Guide blocks (15) are installed on the outer walls of both ends of the steam absorption pipe (5), and the bottom ends of the box cover (12) close to the two guide blocks (15) are connected to guide rods (14), and the two guide blocks (15) are slidably sleeved on adjacent guide rods (14).

2. A purification device for preparing methyl 4-chloroacetoacetate according to claim 1, characterized in that: A feed pipe (2) is fixedly mounted on the top outer wall of the purification box (1), one end of the feed pipe (2) passes through the purification box (1) and is inserted into the interior of the purification box (1), and the end of the feed pipe (2) located inside the purification box (1) does not contact the steam absorption pipe (5), and the bottom end of the purification box (1) is connected to the discharge pipe (3).

3. A purification device for preparing methyl 4-chloroacetoacetate according to claim 1, characterized in that: The bottom end of the steam absorption pipe (5) is trumpet-shaped, and the top end of the steam absorption pipe (5) is fixedly connected to the telescopic bellows (7).

4. A purification device for preparing methyl 4-chloroacetoacetate according to claim 1, characterized in that: The connecting pipe (6) is fixedly mounted on the box cover (12) and an extraction pump (8) is provided at one end close to the box cover (12). The top end of the telescopic bellows (7) and the bottom end of the connecting pipe (6) are fixedly connected.

5. A purification device for preparing methyl 4-chloroacetoacetate according to claim 1, characterized in that: The two auxiliary tubes (9) are symmetrically arranged and both are arc-shaped. One end of the two auxiliary tubes (9) is connected to the top end of the steam absorption tube (5), and the other end of the two auxiliary tubes (9) is connected to the auxiliary absorption tube (11), and the two auxiliary absorption tubes (11) are both trumpet-shaped.

6. A purification device for preparing methyl 4-chloroacetoacetate according to claim 1, characterized in that: The electric push rod (4) and the moving rod (16) are symmetrically arranged on both sides of the telescopic bellows (7). The electric push rod (4) is fixedly mounted on the top of the box cover (12). The output end of the electric push rod (4) passes through the box cover (12) and is fixedly connected to the steam absorption pipe (5).

7. A purification device for preparing methyl 4-chloroacetoacetate according to claim 1, characterized in that: The limiting sleeve (17) is fixedly mounted on the box cover (12), and four limiting blocks (18) are fixedly mounted on the top side wall of the moving rod (16). Four limiting grooves (19) are correspondingly opened on the inner wall of the limiting sleeve (17) close to the four limiting blocks (18), and the four limiting blocks (18) are all slidably connected to the inner walls of adjacent limiting grooves (19).

8. A purification device for preparing methyl 4-chloroacetoacetate according to claim 1, characterized in that: The two guide rods (14) are symmetrically arranged, and a fixing plate (13) is fixedly installed on the inner wall of the purification box (1) near the two guide rods (14). The top ends of the two guide rods (14) are fixedly connected to the box cover (12), and the bottom ends of the two guide rods (14) are fixedly installed on the adjacent fixing plates (13).

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