Self-absorption reaction device for synthesizing paraphthaloyl chloride

Abstract

The utility model provides a self-absorption reaction device for synthesizing paraphthaloyl chloride, and belongs to the technical field of fine chemical engineering. The self-absorption reaction device comprises a reaction kettle, a combined self-absorption paddle, a Venturi jet mixer and a liquid storage tank, a gas phase outlet is formed in the top of the reaction kettle, a material outlet is formed in the bottom of the reaction kettle, the combined self-absorption paddle and the liquid storage tank are arranged in the reaction kettle, the liquid storage tank is arranged at the upper end of the combined self-absorption paddle, and the Venturi jet mixer is arranged in the liquid storage tank. The upper end of the combined self-suction paddle can suck a solution in the liquid storage tank, the solution flows out from the middle part, and the Venturi jet mixer is communicated with the side wall of the reaction kettle. According to the self-absorption reaction device for synthesizing the terephthaloyl chloride, provided by the utility model, reactants are uniformly distributed and fully mixed, the problems that the reactants are not uniformly mixed and the reaction is only carried out on the surface or a shallow part and the like due to the fact that a solution to be reacted is fed from the surface of liquid in a reaction kettle are solved, the reaction effect is good, and the yield of the terephthaloyl chloride is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of fine chemical industry, and particularly relates to a self-priming reaction device for the synthesis of terephthaloyl chloride. Background Art

[0002] Terephthaloyl chloride is an important intermediate of fine chemicals and can be used in organic synthesis. Terephthaloyl chloride can be used as a raw material for polyamide fibers and polyester materials, and is widely used in fields such as plastics, fibers, and films; terephthaloyl chloride can also react with other compounds to form high molecular coatings, which are applied in the coating field; terephthaloyl chloride can also be used to synthesize the amide structure in drugs or as a drug cross-linking agent, which is applied in the pharmaceutical field; in addition to the above main uses, terephthaloyl chloride can also be used in the synthesis of optical materials, the preparation of dyes and pigments, etc.

[0003] At present, most production enterprises use the batch method to synthesize terephthaloyl chloride, and the raw materials enter the reaction kettle batch by batch and intermittently. However, with the expansion of the production scale, when using the batch method to produce terephthaloyl chloride, there are problems such as long reaction time, low process efficiency, high production cost, and unstable product quality of each batch, which is not conducive to large-scale industrial production.

[0004] The prior art CN117920118A discloses an equipment and method for continuously producing m / p-terephthaloyl chloride, including a batching kettle, a tower reactor, a gas-liquid separation tank, and a condenser connected in sequence. The inner cavity of the tower reactor is provided with reaction pipes, and the reaction pipes are distributed in a spiral shape. The outlet of the batching kettle is communicated with the inlet of the reaction pipes, and the tower reactor also includes a heating device for heating the reaction pipes. [[ID=!6]]

[0005] Although this technology shortens the reaction time and improves the process efficiency, in this technology, the raw materials participating in the reaction are sequentially added at the feeding port at the top of the reaction kettle, so that most of the raw materials penetrate into the upper region of the kettle body for mixing and reaction. Since the reaction is too fast, it will cause local overheating of the kettle body, resulting in insufficient and uneven mixing of the raw materials, and generating excessive unreacted raw materials. Only additional devices can be set up to collect the unreacted raw materials, causing unnecessary waste; reintroducing the unreacted raw materials into the reaction kettle for mixing and reaction will consume more production time and labor, and thus cause problems of low production efficiency and high cost. Summary of the Utility Model

[0006] The utility model aims at the deficiencies of the prior art and provides a self-priming reaction device for the synthesis of terephthaloyl chloride, which can evenly distribute and fully mix the reactants, avoid problems such as uneven mixing and only surface reaction caused by adding the solution to be reacted from the surface of the reaction kettle, has a good reaction effect, and a high output of terephthaloyl chloride.

[0007] To achieve the above technical objectives, the present utility model adopts the following technical solutions:

[0008] A self-priming reaction device for terephthaloyl chloride synthesis, comprising a reaction kettle, a combined self-priming impeller, a Venturi jet mixer and a liquid storage tank;

[0009] The top of the reaction kettle is provided with a gas phase outlet, and the bottom of the reaction kettle is provided with a material outlet;

[0010] The combined self-priming impeller and the liquid storage tank are arranged inside the reaction kettle, the liquid storage tank is arranged at the upper end of the combined self-priming impeller, and the upper end of the combined self-priming impeller can suck the solution in the liquid storage tank and flow out from the middle of the combined self-priming impeller;

[0011] The Venturi jet mixer is communicated with the side wall of the reaction kettle.

[0012] Preferably, the combined self-priming impeller includes a hollow shaft and several groups of disk turbine agitators;

[0013] The lower end of the hollow shaft is closed, the upper end of the hollow shaft is provided with a suction port, the liquid storage tank is arranged at the upper end of the hollow shaft, and the liquid storage tank is connected with the suction port;

[0014] The hollow shaft passes through several groups of the disk turbine agitators, and at least one group of the disk turbine agitators among several groups of the disk turbine agitators is provided with several through holes on the disk, and the several through holes are communicated with the hollow shaft.

[0015] Preferably, there are 3 groups of the disk turbine agitators, and the 3 groups of the disk turbine agitators are sequentially arranged in the upper layer, middle layer and lower layer of the reaction kettle, and several through holes are provided on the disk turbine agitator arranged in the middle layer.

[0016] Preferably, the disk turbine agitator arranged in the upper layer is a downward-pressing inclined-blade disk turbine agitator, the middle layer is a straight-blade disk turbine agitator, and the lower layer is an upward-turning inclined-blade disk turbine agitator.

[0017] Preferably, a first feed inlet is provided on the side wall of the reaction kettle.

[0018] Preferably, one side of the Venturi jet mixer is communicated with the first feed inlet, the other side of the Venturi jet mixer is connected with a first feed pipeline, and the top of the Venturi jet mixer is connected with a second feed pipeline.

[0019] Preferably, a second feed inlet is provided on the top of the reaction kettle, and the second feed inlet is connected with the liquid storage tank through a third feed pipeline.

[0020] Compared with the prior art, the beneficial effects produced by the utility model are as follows:

[0021] (1) By arranging a combined self-priming impeller in the reaction kettle, the rotation of the combined self-priming impeller enables the hollow shaft to suck in the thionyl chloride solution in the liquid storage tank and flow out from the middle of the combined self-priming impeller. Under the stirring of the combined self-priming impeller, the mixed solution and the thionyl chloride solution are evenly distributed and fully mixed in the reaction kettle, resulting in a better reaction effect, a high yield of terephthaloyl chloride, improved production efficiency, and avoiding problems such as uneven mixing caused by adding the solution to be reacted from the liquid surface of the reaction kettle, and only the surface or shallow part of the reaction occurs, which may lead to local overheating of the kettle body and the production of an excessive amount of solution that does not participate in the reaction;

[0022] (2) By arranging a downward-pressing inclined-blade disc turbine stirring impeller on the upper layer of the hollow shaft, the solution to be reacted can move downward, and an upward-turning inclined-blade disc turbine stirring impeller is arranged on the lower layer, enabling the solution to be reacted to move upward, further improving the mixing effect of the two solutions to be reacted, resulting in a better reaction effect and a further higher yield of terephthaloyl chloride;

[0023] (3) By arranging a Venturi injection mixer, the mixed solution formed by dissolving the carboxylic acid powder in the dichloroethane solution can be mixed more evenly, and then the mixed solution reacts with the solution in the liquid storage tank, resulting in a better reaction effect and a higher yield. Description of the Drawings

[0024] Figure 1 Schematic diagram of a self-priming reaction device for terephthaloyl chloride synthesis according to an embodiment of the utility model;

[0025] Figure 2 Schematic diagram of the structure of the combined self-priming impeller according to an embodiment of the utility model;

[0026] Figure 3 Enlarged view of the through-hole area of the combined self-priming impeller according to an embodiment of the utility model;

[0027] Figure 4 Flow field analysis diagram of the self-priming reaction device for terephthaloyl chloride synthesis using the utility model;

[0028] Figure 5 Flow field analysis diagram of terephthaloyl chloride synthesis using the surface dropping method.

[0029] Explanation of the marks in the figure: 1. Reactor; 11. Gas phase outlet; 12. Material outlet; 13. First feed port; 2. Combined self-priming paddle; 21. Hollow shaft; 211. Suction port; 22. Disc turbine agitator; 221. Downward pressure type pitched-blade disc turbine agitator; 222. Straight-blade disc turbine agitator; 2221. Through hole; 223. Upturned pitched-blade disc turbine agitator; 3. Venturi jet mixer; 31. First feed pipe; 32. Second feed pipe; 4. Liquid storage tank; 41. Second feed port; 42. Third feed pipe. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on 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.

[0031] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "two ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0033] Example 1

[0034] Combine Figures 1 - 3As shown in the figure, an internal self-priming reaction device for terephthaloyl chloride synthesis provided by an embodiment of the present utility model includes a reaction kettle 1, a combined self-priming impeller 2, a Venturi injection mixer 3, and a liquid storage tank 4. A gas phase outlet 11 is provided at the top of the reaction kettle 1, and a material outlet 12 is provided at the bottom of the reaction kettle 1. The combined self-priming impeller 2 and the liquid storage tank 4 are arranged inside the reaction kettle 1. The combined self-priming impeller 2 includes a hollow shaft 21 and several groups of disk turbine agitators 22. The lower end of the hollow shaft 21 is closed, and a suction port 211 is provided at the upper end of the hollow shaft 21. The liquid storage tank 4 is arranged at the upper end of the hollow shaft 21, and the liquid storage tank 4 is connected to the suction port 211. The hollow shaft 21 passes through several groups of the disk turbine agitators 22. A plurality of through holes 2221 are provided on the disks of at least one group of the disk turbine agitators 22 among several groups of the disk turbine agitators 22, and the plurality of through holes 2221 are communicated with the hollow shaft 21. When the combined self-priming impeller 2 rotates, the suction port 211 of the hollow shaft 21 can suck the solution in the liquid storage tank 4 and flow out from the through holes 2221 on the disks of the disk turbine agitators 22. The Venturi injection mixer 3 is communicated with the side wall of the reaction kettle 1.

[0035] The mixed solution in the Venturi injection mixer 3 enters the reaction kettle 1. The rotation of the combined self-priming impeller 2 causes the hollow shaft 21 to suck the solution in the liquid storage tank 4 through the suction port 211 and flow out from the through holes 2221. The two solutions to be reacted are uniformly mixed under the agitation of the combined agitator, and the reaction is carried out, avoiding problems such as uneven mixing of the reactants caused by adding the solution to be reacted from the liquid surface of the reaction kettle and only reacting on the surface or in the shallow layer, avoiding local overheating of the reaction kettle body and generating an excessive amount of solution that does not participate in the reaction, enabling the two solutions to be reacted fully, and improving the production efficiency.

[0036] Figure 4 The mixing situation of terephthaloyl chloride synthesis using the internal self-priming reaction device of the present utility model is shown, and it can be seen that the raw materials to be reacted in the reaction area are mixed more uniformly; Figure 5 The mixing situation of terephthaloyl chloride synthesis using the surface dropping method is shown, and it can be seen that the reactants are distributed in a small area on the liquid surface, and the raw materials to be reacted are not fully mixed. To avoid local overheating of the kettle body caused by a fast surface dropping speed, it is necessary to control and slow down the surface dropping speed.

[0037] At the same time, the reaction effects of the two reaction devices under the same initial conditions are compared, and it is found that the synthesis time of terephthaloyl chloride using the surface dropping method is 6 - 8 h, while the synthesis time of terephthaloyl chloride using the internal self-priming reaction device of the present utility model is shortened to 4 - 5 h.

[0038] Example 2

[0039] According to a specific embodiment of the present utility model, there are 3 groups of the disc turbine stirring paddles 22, and the 3 groups of the disc turbine stirring paddles 22 are sequentially arranged in the upper layer, middle layer, and lower layer of the reaction kettle 1. A number of through holes 2221 are provided on the disc turbine stirring paddle 22 arranged in the middle layer. Specifically, the disc turbine stirring paddle 22 arranged in the upper layer is a downward-pressing inclined-blade disc turbine stirring paddle 221, the middle layer is a straight-blade disc turbine stirring paddle 222, and the lower layer is an upward-turning inclined-blade disc turbine stirring paddle 223. In this embodiment, the paddle blades of the disc turbine stirring paddles in the upper layer, middle layer, and lower layer are all 6 groups.

[0040] By adopting the downward-pressing inclined-blade disc turbine stirring paddle 221, the solution to be reacted can be driven to move downward, and by adopting the upward-turning inclined-blade disc turbine stirring paddle 223, the solution to be reacted can be driven to move upward, so that the two solutions to be reacted are further mixed more uniformly and the reaction effect is better.

[0041] Example 3

[0042] According to a specific embodiment of the present utility model, a first feed inlet 13 is provided on the side wall of the reaction kettle 1. One side of the Venturi injection mixer 3 is communicated with the first feed inlet 13. The other side of the Venturi injection mixer 3 is connected with a first feed pipeline 31. The top of the Venturi injection mixer 3 is connected with a second feed pipeline 32. A second feed inlet 41 is provided on the top of the reaction kettle 1, and the second feed inlet 41 is connected with the liquid storage tank 4 through a third feed pipeline 42.

[0043] The dichloroethane solution enters the Venturi injection mixer 3 through the first feed pipeline 31, and the carboxylic acid powder enters the Venturi injection mixer 3 through the second feed pipeline 32. The dichloroethane solution and the carboxylic acid powder are injected and mixed through the Venturi injection mixer 3 to obtain a mixed solution. The mixed solution enters the reaction kettle 1 through the first feed inlet 13. By providing the Venturi injection mixer 3, the dichloroethane solution and the carboxylic acid powder can be mixed more uniformly through injection mixing, and the obtained mixed solution reacts with the solution in the liquid storage tank 4, and the reaction effect is better.

[0044] The above are only the embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the scope of the application of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A self-priming reaction device for terephthaloyl chloride synthesis, characterized in that, It includes a reaction kettle, a combined self-priming impeller, a Venturi injection mixer and a liquid storage tank; The top of the reaction kettle is provided with a gas phase outlet, and the bottom of the reaction kettle is provided with a material outlet; The combined self-priming impeller and the liquid storage tank are arranged inside the reaction kettle. The liquid storage tank is arranged at the upper end of the combined self-priming impeller. The upper end of the combined self-priming impeller can suck the solution in the liquid storage tank and flow out from the middle of the combined self-priming impeller; The Venturi injection mixer is communicated with the side wall of the reaction kettle.

2. The self-priming reaction device for terephthaloyl chloride synthesis according to claim 1, characterized in that, The combined self-priming impeller includes a hollow shaft and several groups of disc turbine stirring impellers; The lower end of the hollow shaft is closed, the upper end of the hollow shaft is provided with a suction port, the liquid storage tank is arranged at the upper end of the hollow shaft, and the liquid storage tank is connected with the suction port; The hollow shaft passes through several groups of the disc turbine stirring impellers. At least one group of the disc turbine stirring impellers has several through holes on the disc, and the several through holes are communicated with the hollow shaft.

3. The self-priming reaction device for terephthaloyl chloride synthesis according to claim 2, wherein, There are 3 groups of the disc turbine stirring impellers, and the 3 groups of the disc turbine stirring impellers are sequentially arranged in the upper layer, middle layer and lower layer of the reaction kettle. The disc turbine stirring impeller arranged in the middle layer is provided with several through holes.

4. The self-priming reaction device for terephthaloyl chloride synthesis according to claim 3, characterized in that, The disc turbine stirring impeller arranged in the upper layer is a downward-pressing inclined-blade disc turbine stirring impeller, the middle layer is a straight-blade disc turbine stirring impeller, and the lower layer is an upward-turning inclined-blade disc turbine stirring impeller.

5. The self-priming reaction device for terephthaloyl chloride synthesis according to claim 4, characterized in that, The side wall of the reaction kettle is provided with a first feed inlet.

6. The self-priming reaction device for terephthaloyl chloride synthesis according to claim 5, characterized in that, One side of the Venturi injection mixer is communicated with the first feed inlet, the other side of the Venturi injection mixer is connected with a first feed pipeline, and the top of the Venturi injection mixer is connected with a second feed pipeline.

7. The self-priming reaction device for terephthaloyl chloride synthesis according to claim 6, wherein, The top of the reaction kettle is provided with a second feed inlet, and the second feed inlet is connected with the liquid storage tank through a third feed pipeline.

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