A continuous production device for synthesizing acrylic acid by catalyzing carbon dioxide and acetylene

Abstract

This utility model belongs to the field of carbon dioxide catalysis technology, specifically disclosing a continuous production device for synthesizing acrylic acid using carbon dioxide and acetylene catalysis. It includes a high-pressure reaction tank, with a reaction mechanism fixedly installed inside. A storage tank is fixedly connected to the upper end of the high-pressure reaction tank, and the storage tank is filled with a mixed liquid. A liquid supply mechanism is fixedly installed between the high-pressure reaction tank and the storage tank. Multiple openings are provided at the bottom of the high-pressure reaction tank, and a first connecting box is fixedly connected to the bottom of the high-pressure reaction tank. A fitting port is also provided at the bottom of the first connecting box, and a distillation unit is fixedly connected to it. An electric constriction tube drives a piston plate to push the mixed liquid, and a spring-loaded abutment plate automatically seals the connection channel. This effectively prevents residual air or external oxygen from seeping in during the feeding process, stably maintaining the oxygen-free environment required for the reaction, reducing catalyst deactivation and acetylene polymerization side reactions, and significantly improving reaction selectivity and feed conversion rate.

Description

Technical Field

[0001] This utility model relates to the field of carbon dioxide catalysis technology, specifically a continuous production device for synthesizing acrylic acid using carbon dioxide and acetylene as catalysts. Background Technology

[0002] The current push for "dual carbon" goals and the urgent need for green transformation of the chemical industry are pressing. As a major greenhouse gas, the high-value utilization of carbon dioxide is an important direction for alleviating environmental pressure. Acrylic acid is a key raw material in the fields of polymer materials and coatings. Traditional synthesis processes using propylene as a raw material rely on petroleum and have high carbon emissions. Therefore, developing a technology for the catalytic synthesis of acrylic acid from carbon dioxide and acetylene has both environmental and economic value.

[0003] Existing synthesis equipment faces several technical challenges: First, the reaction requires a strictly oxygen-free environment, and traditional stepwise manual feeding easily introduces air, leading to catalyst deactivation and a decline in raw material conversion rate. Second, the gas-liquid-solid three-phase mixing relies on fixed stirring, resulting in low mass transfer efficiency, numerous byproducts, long reaction cycles, and difficulty in meeting the needs of continuous industrial production. Utility Model Content

[0004] The purpose of this invention is to provide a continuous production apparatus for synthesizing acrylic acid using carbon dioxide and acetylene as catalysts, so as to solve the problems mentioned in the background art.

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

[0006] A continuous production apparatus for the catalytic synthesis of acrylic acid using carbon dioxide and acetylene includes a high-pressure reaction vessel, a reaction mechanism fixedly installed inside the high-pressure reaction vessel, and a storage tank fixedly connected to the upper end of the high-pressure reaction vessel, the storage tank being filled with a mixed liquid.

[0007] A liquid supply mechanism is fixedly installed between the high-pressure reaction tank and the liquid storage tank. The bottom of the high-pressure reaction tank has multiple openings, and the bottom of the high-pressure reaction tank is also fixedly connected to a first connecting box. The bottom of the first connecting box is also provided with a mating port, and a distillation machine is fixedly connected to the mating port.

[0008] As a further aspect of this solution, the liquid supply mechanism includes an electric contraction tube, which is fixedly connected to the top of the inner wall of the liquid storage tank. A piston plate is fixedly connected to the bottom of the electric contraction tube. A mating port is opened on the outer wall of the piston plate. A third electronic valve is installed inside the mating port. A second connecting box is fixedly connected to the bottom of the liquid storage tank. A connecting pipe is fixedly connected to the bottom of the second connecting box.

[0009] As a further aspect of this solution, a connecting frame is fixedly connected to the inner wall of the connecting pipe, and a resetting circular plate is slidably connected to the inner wall of the connecting frame. The outer wall of the resetting circular plate abuts against the bottom of the connecting frame, and the bottom of the resetting circular plate is located inside the high-pressure reaction vessel.

[0010] As a further aspect of this solution, the reaction mechanism includes an elastic telescopic rod, which is fixedly connected to the bottom of the inner wall of the high-pressure reaction vessel. A fixing plate is fixedly connected to the upper end of the elastic telescopic rod, and a rotating plate is rotatably connected to the upper end of the fixing plate.

[0011] As a further aspect of this solution, a liquid outlet pipe is fixedly connected inside the rotating plate, and a second electronic valve is fixedly installed inside the liquid outlet pipe. The outer wall of the rotating plate abuts against the inner wall of the high-pressure reaction vessel. Multiple stirring bars with reset function are slidably connected to the upper end of the rotating plate, and the upper end of the stirring bars abuts against the top of the inner wall of the high-pressure reaction vessel.

[0012] As a further aspect of this solution, a servo motor is fixedly installed at the upper end of the elastic telescopic rod, and a first connecting pipe and a second connecting pipe are fixedly connected at the upper end of the high-pressure reaction tank. A double-pass pipe is fixedly connected at the end of the first connecting pipe away from the high-pressure reaction tank. The double-pass pipe is respectively connected to a carbon dioxide gas supply pipe and a hydrogen gas supply pipe. A first electronic valve is fixedly installed inside both the first connecting pipe and the second connecting pipe. A gas storage tank is threadedly connected at the end of the second connecting pipe away from the high-pressure reaction tank. The gas storage tank is filled with compressed acetylene gas.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] The electric shrink tube drives the piston plate to push the mixture, and the contact plate automatically seals the connection channel under the action of the spring. This effectively avoids residual air or external oxygen infiltration during the feeding process, stabilizes the oxygen-free environment required for the reaction, reduces catalyst deactivation and acetylene polymerization side reactions, and significantly improves reaction selectivity and raw material conversion rate. At the same time, when the rotating plate moves down, it can drive the stirring bar to dynamically adjust its position. Combined with its rotation function, it can fully stir the mixture with acetylene, carbon dioxide and hydrogen, greatly optimize the gas-liquid-solid three-phase mass transfer mixing effect, and reduce the problems of local gas enrichment and uneven catalyst dispersion. Attached Figure Description

[0015] Figure 1 This is a front view of a continuous production apparatus for synthesizing acrylic acid using carbon dioxide and acetylene as catalysts.

[0016] Figure 2 This is a schematic diagram of the internal structure of a high-pressure reactor in a continuous production unit that uses carbon dioxide and acetylene to catalyze the synthesis of acrylic acid.

[0017] Figure 3 This is a schematic diagram of the internal structure of a storage tank in a continuous production unit that uses carbon dioxide and acetylene to catalyze the synthesis of acrylic acid.

[0018] Figure 4 This is a schematic diagram of the reaction mechanism in a continuous production unit that uses carbon dioxide and acetylene to catalyze the synthesis of acrylic acid.

[0019] Figure 5 This is a schematic diagram of the position of the abutting circular plate in a continuous production device that uses carbon dioxide and acetylene to catalyze the synthesis of acrylic acid.

[0020] Figure 6 This is a schematic diagram of the position and structure of an elastic telescopic rod in a continuous production unit that uses carbon dioxide and acetylene to catalyze the synthesis of acrylic acid.

[0021] In the diagram: 1. High-pressure reaction vessel; 2. Liquid storage tank; 3. First connecting box; 4. Dual-way pipe; 5. Electric shrink pipe; 6. Piston plate; 7. Second connecting box; 8. Connecting pipe; 9. First connecting pipe; 10. Second connecting pipe; 11. Gas storage tank; 12. First electronic valve; 13. Connecting frame; 14. Elastic telescopic rod;

[0022] 15. Corrugated sleeve; 16. Fixed plate; 17. Rotating plate; 18. First spring; 19. Abutting circular plate; 20. Servo motor; 21. Sliding port; 22. Second spring; 23. Stirring bar; 24. Mounting cover; 25. Through-hole; 26. Liquid outlet pipe; 27. Second electronic valve; 28. Distillation unit; 29. ​​Exhaust valve; 101. Liquid supply mechanism; 201. Reaction mechanism. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1: Please refer to Figures 1-2As shown in this embodiment of the present invention, a continuous production apparatus for the catalytic synthesis of acrylic acid using carbon dioxide and acetylene includes a high-pressure reaction tank 1. A reaction mechanism 201 is fixedly installed inside the high-pressure reaction tank 1. An exhaust valve 29 is fixedly installed at the upper end of the high-pressure reaction tank 1. By opening the exhaust valve 29 and connecting it to an external air pump, oxygen can be extracted from inside the high-pressure reaction tank 1, maintaining an oxygen-free environment inside the high-pressure reaction tank 1. A storage tank 2 is also fixedly connected to the upper end of the high-pressure reaction tank 1. The storage tank 2 is filled with a mixed liquid composed of acetonitrile / water in a (50 / 50) ratio, and also contains 100% [unspecified ingredient]. The catalyst is composed of three-thirds nickel-based catalyst, which is in liquid state. The upper end of the storage tank 2 is provided with a liquid injection port, and the outer wall of the liquid injection port is threaded with a mounting cap 24. A liquid supply mechanism 101 is also fixedly installed between the high-pressure reaction tank 1 and the storage tank 2. The bottom of the high-pressure reaction tank 1 is provided with multiple through holes 25. The bottom of the high-pressure reaction tank 1 is also fixedly connected with a first connecting box 3. The bottom of the first connecting box 3 is also provided with a fitting port, and the fitting port is fixedly connected with a distillation machine 28 (specifically, the DB-GY302 reactive distillation experimental machine of Shanghai Dingbang Educational Equipment Manufacturing Co., Ltd., which can realize ordinary distillation operation and reactive distillation, and can realize continuous operation).

[0025] Example 2: Please refer to Figures 1-3 As shown, the liquid supply mechanism 101 includes an electric contraction tube 5, which is fixedly connected to the top of the inner wall of the liquid storage tank 2. A piston plate 6 is fixedly connected to the bottom of the electric contraction tube 5. A mating port is provided on the outer wall of the piston plate 6, and a third electronic valve (not shown in the figure) is installed inside the mating port. The third electronic valve is in a closed state. A rubber ring is fixedly connected to the outer wall of the piston plate 6. The rubber ring is made of rubber. A second connecting box 7 is fixedly connected to the bottom of the liquid storage tank 2. A connecting pipe 8 is fixedly connected to the bottom of the second connecting box 7. Specifically, when the electric contraction tube 5 extends downward and drives the piston plate 6 to move, the piston plate 6 will then fit against the inner wall of the second connecting box 7. This enhances the sealing between the piston plate 6 and the inner wall of the second connecting box 7. The inner wall of the connecting pipe 8 is also fixedly connected to a connecting frame 13, and the inner wall of the connecting frame 13 is slidably connected to an abutment round plate 19 with a reset function. Specifically, a first spring 18 is fixedly connected between the abutment round plate 19 and the connecting frame 13. The first spring 18 is sleeved on the outer wall of the abutment round plate 19. The outer wall of the abutment round plate 19 abuts against the bottom of the connecting frame 13. The bottom of the abutment round plate 19 is located inside the high-pressure reaction tank 1. Specifically, when liquid is introduced into the connecting pipe 8, the pressure will push the abutment round plate 19 downwards, and the abutment round plate 19 will move into the high-pressure reaction tank 1, leaving more space for liquid release.

[0026] Please see Figures 2-6As shown, the reaction mechanism 201 includes an elastic telescopic rod 14, which is fixedly connected to the bottom of the inner wall of the high-pressure reaction vessel 1. A fixing plate 16 is fixedly connected to the upper end of the elastic telescopic rod 14, and a corrugated sleeve 15 is fixedly connected between the fixing plate 16 and the inner wall of the high-pressure reaction vessel 1 (see reference). Figure 4 The elastic telescopic rod 14 is located inside the corrugated sleeve 15, which protects the internal components and prevents liquid from adhering to them. A rotating plate 17 is rotatably connected to the upper end of the fixed plate 16 via a rotating shaft. An outlet pipe 26 is fixedly connected inside the rotating plate 17, and a second electronic valve 27 (which is existing technology and will not be described in detail here) is fixedly installed inside the outlet pipe 26. The outer wall of the rotating plate 17 abuts against the top of the inner wall of the high-pressure reaction vessel 1. Multiple stirring strips 23 with reset functions are slidably connected to the upper end of the rotating plate 17. Specifically, the upper end of the rotating plate 17 has... There are multiple sliding ports 21, which are circumferentially distributed on the upper end of the rotating plate 17. Each stirring bar 23 is slidably connected to the inner wall of a nearby sliding port 21, and the stirring bar 23 is fixedly connected to the inner wall of the sliding port 21 by multiple second springs 22. Each second spring 22 is in a compressed state. The upper end of the stirring bar 23 abuts against the top of the inner wall of the high-pressure reaction vessel 1. A servo motor 20 is also fixedly installed on the upper end of the elastic telescopic rod 14. The output end of the servo motor 20 is fixedly connected to the bottom of the rotating plate 17, and the output end of the servo motor 20 passes through the inside of the fixed plate 16.

[0027] The upper end of the high-pressure reaction vessel 1 is fixedly connected to a first connecting pipe 9 and a second connecting pipe 10. The end of the first connecting pipe 9 away from the high-pressure reaction vessel 1 is fixedly connected to a double-pass pipe 4. The double-pass pipe (4) is connected to a carbon dioxide gas supply pipe and a hydrogen gas supply pipe respectively. The first electronic valve 12 is fixedly installed inside the first connecting pipe 9 and the second connecting pipe 10 (the first electronic valve 12 is existing technology and will not be described in detail here). The end of the second connecting pipe 10 away from the high-pressure reaction vessel 1 is threadedly connected to a gas storage tank 11. The gas storage tank 11 is filled with compressed acetylene gas, and the pressure inside the gas storage tank 11 is greater than the elastic coefficient of the elastic telescopic rod 14.

[0028] The working principle of this utility model is as follows:

[0029] When using this utility model, it is only necessary to connect the double-pass pipe 4 to the carbon dioxide gas supply pipe and the hydrogen gas supply pipe. At this time, the electric shrink pipe 5 is started to drive the piston plate 6 to move downward. When the piston plate 6 moves into the second connecting box 7, the outer wall of the piston plate 6 will abut against the inner wall of the second connecting box 7. The piston plate 6 will push the mixture inside the second connecting box 7 and the connecting pipe 8 into the high-pressure reaction tank 1. It is worth noting that when the piston plate 6 moves into the inner wall of the second connecting box 7, the mixture inside the second connecting box 7 will push the abutting round plate 19 open. The abutting round plate 19 will disengage from the abutment with the bottom of the connecting frame 13, and the mixture will pass through the connecting frame 13 and enter the high-pressure reaction tank 1.

[0030] When the mixture enters the interior of the high-pressure reaction vessel 1, the rotating plate 17 moves downward and compresses and stores force on the elastic telescopic rod 14. When the rotating plate 17 moves downward, the stirring bar 23 disengages from the bottom of the inner wall of the high-pressure reaction vessel 1, and the second spring 22 drives the stirring bar 23 to move upward. Note that there is no air in the space between the interior of the high-pressure reaction vessel 1 and the upper end of the rotating plate 17. When the piston plate 6 stops moving, the abutting circular plate 19 resets under the action of the first spring 18, sealing the bottom of the connecting pipe 8.

[0031] At this time, the first electronic valve 12 inside the second connecting pipe 10 is opened, and the compressed acetylene gas inside the gas storage tank 11 enters the high-pressure reaction tank 1 through the second connecting pipe 10. The rotating plate 17 continues to move downward. At this time, the first electronic valve 12 inside the first connecting pipe 9 is opened again, and carbon dioxide gas and hydrogen gas enter the high-pressure reaction tank 1 through the double-pass pipe 4 and the first connecting pipe 9. The servo motor 20 is started to drive the rotating plate 17 to rotate. The rotating plate 17 drives all the raised stirring bars 23 to stir the mixture, so that the mixture is fully mixed and reacted with the acetylene gas, carbon dioxide gas and hydrogen gas.

[0032] After the mixing reaction is complete, the servo motor 20 is started to rotate, and the second electronic valve 27 is opened. At this time, the liquid after reaction inside the high-pressure reaction tank 1 will enter the distillation machine 28 through the liquid outlet pipe 26. Then the distillation machine 28 will react with the liquid after reaction. After the liquid and gas inside the high-pressure reaction tank 1 are discharged, the rotating plate 17 will be reset. When the piston plate 6 is reset, the third electronic valve opens. After the piston plate 6 is reset, the third electronic valve closes, and it can be used for the next time.

[0033] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A continuous production apparatus for the catalytic synthesis of acrylic acid using carbon dioxide and acetylene, comprising a high-pressure reaction vessel (1), characterized in that, The high-pressure reaction vessel (1) is fixedly installed with a reaction mechanism (201), and a liquid storage tank (2) is fixedly connected to the upper end of the high-pressure reaction vessel (1). The liquid storage tank (2) is filled with a mixed liquid. A liquid supply mechanism (101) is fixedly installed between the high-pressure reaction tank (1) and the liquid storage tank (2). The bottom of the high-pressure reaction tank (1) has multiple openings (25). The bottom of the high-pressure reaction tank (1) is also fixedly connected to a first connecting box (3). The bottom of the first connecting box (3) is also provided with a mating port, and a distillation machine (28) is fixedly connected to the mating port.

2. The continuous production apparatus for synthesizing acrylic acid using carbon dioxide and acetylene as catalytically according to claim 1, characterized in that, The liquid supply mechanism (101) includes an electric shrink tube (5), which is fixedly connected to the top of the inner wall of the liquid storage tank (2). A piston plate (6) is fixedly connected to the bottom of the electric shrink tube (5). A mating port is opened on the outer wall of the piston plate (6). A third electronic valve is installed inside the mating port. A second connecting box (7) is fixedly connected to the bottom of the liquid storage tank (2). A connecting pipe (8) is fixedly connected to the bottom of the second connecting box (7).

3. A continuous production apparatus for the catalytic synthesis of acrylic acid using carbon dioxide and acetylene according to claim 2, characterized in that, The inner wall of the connecting pipe (8) is also fixedly connected to a connecting frame (13), and the inner wall of the connecting frame (13) is slidably connected to an abutting circular plate (19) with a reset function. The outer wall of the abutting circular plate (19) abuts against the bottom of the connecting frame (13), and the bottom of the abutting circular plate (19) is located inside the high-pressure reaction vessel (1).

4. A continuous production apparatus for the catalytic synthesis of acrylic acid using carbon dioxide and acetylene according to claim 1, characterized in that, The reaction mechanism (201) includes an elastic telescopic rod (14), which is fixedly connected to the bottom of the inner wall of the high-pressure reaction vessel (1). A fixing plate (16) is fixedly connected to the upper end of the elastic telescopic rod (14), and a rotating plate (17) is rotatably connected to the upper end of the fixing plate (16).

5. A continuous production apparatus for the catalytic synthesis of acrylic acid using carbon dioxide and acetylene according to claim 4, characterized in that, The rotating plate (17) is fixedly connected to the inside of the liquid outlet pipe (26), and the liquid outlet pipe (26) is fixedly installed with a second electronic valve (27). The outer wall of the rotating plate (17) abuts against the inner wall of the high-pressure reaction tank (1). The upper end of the rotating plate (17) is slidably connected with a plurality of stirring bars (23) with reset function. The upper end of the stirring bar (23) abuts against the top of the inner wall of the high-pressure reaction tank (1).

6. A continuous production apparatus for the catalytic synthesis of acrylic acid using carbon dioxide and acetylene according to claim 5, characterized in that, A servo motor (20) is fixedly installed at the upper end of the elastic telescopic rod (14). The upper end of the high-pressure reaction tank (1) is fixedly connected to a first connecting pipe (9) and a second connecting pipe (10). A double-pass pipe (4) is fixedly connected to the end of the first connecting pipe (9) away from the high-pressure reaction tank (1). The double-pass pipe (4) is connected to a carbon dioxide gas supply pipe and a hydrogen gas supply pipe, respectively. A first electronic valve (12) is fixedly installed inside both the first connecting pipe (9) and the second connecting pipe (10). A gas storage tank (11) is threadedly connected to the end of the second connecting pipe (10) away from the high-pressure reaction tank (1). The gas storage tank (11) is filled with compressed acetylene gas.

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