Efficient purification device for propionyl chloride production

Abstract

The invention relates to the technical field of propionyl chloride production, in particular to an efficient purification device for propionyl chloride production, which comprises a support plate, the lower end of the support plate is fixedly connected with a plurality of support legs, the upper end of the support plate is fixedly connected with a reaction furnace, and the side wall of the reaction furnace is provided with an air inlet and an air outlet. The gas inlet is communicated with an inert gas pipe, a purifying box is fixedly connected to the position, at the gas outlet, of the outer side of the reaction furnace, a plurality of collecting openings are formed in the side wall of the purifying box, and a circulating box is fixedly connected to the lower end of the purifying box. Through the stirring assembly and the water curtain nozzle, the contact efficiency of gas and an alkaline solution is enhanced, the adsorption and dissolution speed of HC gas is increased, efficient gas purification is ensured, a liquid circulation system between the circulation box and the purification box effectively reduces consumption of the solution, cyclic utilization of resources is achieved, the operation cost is reduced, and the device is suitable for popularization and application. The operation is simple, and the occupied area of equipment is small.

Description

Technical Field

[0001] This invention relates to the field of propionyl chloride production technology, and more specifically to a high-efficiency purification device for propionyl chloride production. Background Technology

[0002] Propionyl chloride (chemical formula: CH3COCl) is an organochloride widely used in organic synthesis and industrial chemical reactions. It is a highly reactive compound, particularly reacting with water, alcohols, and amino compounds to form corresponding acylated products. Propionyl chloride is typically prepared by reacting acetic acid with a chlorinating agent, commonly chlorine gas or phosphorus chloride. The preparation chemical formula is: CH3COOH + Cl2 → CH3COCl + HCl.

[0003] As can be seen from the above chemical formula, when propionyl chloride is produced by reacting acetic acid and chlorine, HCl will be generated as a byproduct. The HCl in the product needs to be removed to ensure the purity of the product propionyl chloride. However, existing propionyl chloride production equipment mostly adopts simple gas purification methods, which often have problems such as low purification efficiency, complicated operation and large equipment footprint. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a high-efficiency purification device for the production of propionyl chloride, which can effectively solve the problems of complex operation and high cost in the removal of HCl in the existing propionyl chloride production device.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a high-efficiency purification device for the production of propionyl chloride, including a support plate, a plurality of support legs fixedly connected to the lower end of the support plate, a reaction furnace fixedly connected to the upper end of the support plate, an air inlet and an air outlet on the side wall of the reaction furnace, an opening at the upper end of a circulation tank, an alkaline solution placed in the purification tank and the circulation tank, a drain outlet on the bottom wall of the purification tank, a stirring assembly inside the purification tank, a circulation assembly between the circulation tank and the purification tank, a liquid injection port at the upper end of the purification tank, and a liquid exchange assembly at the upper end of the purification tank.

[0007] The circulation assembly includes a circulation pump fixedly installed at the lower end of the support plate, a connecting pipe connecting the upper end of the circulation pump to the circulation tank, a circulation water pipe connecting the lower end of the circulation pump to the liquid injection port at the upper end of the purification tank, and a water curtain nozzle connecting the lower end of the liquid injection port.

[0008] According to the above-mentioned high-efficiency purification device for the production of propionyl chloride, the stirring assembly includes a mounting box fixedly connected to the lower end of the purification chamber. A rotating rod is rotatably connected to one end of the mounting box near the drain outlet. Multiple paddles are fixedly arranged in a ring on the shaft of the rotating rod. A driving bevel gear is rotatably connected to the inner side wall of the mounting box and is coaxially fixedly connected to the rotating rod. The driving bevel gear meshes with a driven bevel gear. A rotating shaft is coaxially fixedly connected to the upper end of the driven bevel gear. A stirring shaft is rotatably connected to the bottom wall of the purification chamber, and the lower end of the stirring shaft passes through the bottom wall of the purification chamber. Multiple stirring rods are fixedly connected in a ring on the upper shaft of the stirring shaft. Both the stirring shaft and the rotating shaft are fixedly fitted with sprockets. A chain is rotatably fitted to the outer sides of the two sprockets.

[0009] According to the above-mentioned high-efficiency purification device for the production of propionyl chloride, the gas introduced into the inert gas tube is nitrogen.

[0010] According to the above-mentioned high-efficiency purification device for the production of propionyl chloride, the liquid exchange assembly includes an L-shaped mounting plate fixedly connected to a purification tank. A rotary motor is fixedly installed at one end of the L-shaped mounting plate near the purification tank. A threaded rod is fixedly connected to the output end of the rotary motor. A threaded sleeve block is threadedly sleeved on the body of the threaded rod. A first connecting block and a second connecting block are fixedly connected at intervals at one end of the threaded sleeve block near the liquid injection port. The first connecting block is connected to the upper end of the circulating water pipe, and the second connecting block is fixedly connected to a liquid addition pipe.

[0011] According to the above-mentioned high-efficiency purification device for the production of propionyl chloride, a discharge box is fixedly connected to the upper end of the support plate, and when the vertical position of the liquid addition pipe corresponds to the vertical position of the liquid injection port, the first connecting block is located directly above the discharge box.

[0012] According to the above-mentioned high-efficiency purification device for the production of propionyl chloride, both the gas inlet and the gas outlet on the side wall of the reactor are equipped with heat-insulated one-way valves.

[0013] According to the above-mentioned high-efficiency purification device for the production of propionyl chloride, nitrogen gas is introduced into the reactor through the inert gas pipe, and the gas in the reactor will not flow back to the inert gas pipe; the gas in the reactor can only flow to the purification box.

[0014] The technical solution provided by this invention has the following advantages compared with the known prior art:

[0015] 1. This invention uses a circulating pump to lift the alkaline solution collected in the circulation tank to the purification tank, and sprays it out in the form of a water curtain through the water curtain nozzles on the top wall of the purification tank. The surface tension and fluidity of water enhance the contact area between the gas and the liquid, thereby improving the adsorption efficiency. Compared with some methods such as high-temperature oxidation, the process of using water curtain adsorption technology is gentle, does not produce dangerous side reactions, and is safer to operate.

[0016] 2. In this invention, after the alkaline liquid is sprayed out by the water curtain nozzle to adsorb HCl gas, the alkaline liquid falls through the drain outlet. The alkaline solution actuates multiple sprockets, converting its gravitational potential energy into the rotational mechanical energy of the rotating rod. Through the meshing of the active and driven bevel gears and the cooperation between the chain and the two sprockets, the rotation drives the stirring shaft to rotate, which can continuously stir the alkaline solution in the purification tank, accelerate the contact between the solute and the solvent, and make the solute dissolution process more uniform and rapid. In addition, it can increase the contact efficiency between HCl gas and liquid, thereby improving the adsorption and purification effect of the gas.

[0017] In summary, the stirring assembly and water curtain nozzles enhance the contact efficiency between the gas and the alkaline solution, improve the adsorption and dissolution rate of HCl gas, and ensure efficient gas purification. The liquid circulation system between the circulation tank and the purification tank effectively reduces solution consumption, realizes resource recycling, reduces operating costs, and is simple to operate with a small footprint. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0019] Figure 1 This is a structural schematic diagram from a first perspective of the present invention;

[0020] Figure 2 This is a structural schematic diagram from a second perspective of the present invention;

[0021] Figure 3 This is a structural schematic diagram of the invention from a third perspective;

[0022] Figure 4 for Figure 3 Enlarged structural diagram of section A;

[0023] Figure 5 for Figure 4 A schematic diagram of the internal structure of the mounting box.

[0024] Reference numerals: 1. Support plate; 2. Support leg; 3. Reactor; 4. Purification box; 41. Collection port; 5. Inert gas pipe; 6. Drain outlet; 7. Rotating rod; 8. Paddle; 9. Mounting box; 10. Stirring shaft; 11. Stirring rod; 12. Driving bevel gear; 13. Driven bevel gear; 14. Rotating shaft; 15. Sprocket; 16. Chain; 17. Circulation box; 18. Circulation pump; 19. First connecting block; 20. Circulation water pipe; 21. Second connecting block; 22. Liquid filling pipe; 23. L-shaped mounting plate; 24. Rotary motor; 25. Threaded rod; 26. Threaded sleeve block. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] The present invention will be further described below with reference to embodiments.

[0027] Example: Refer to Figures 1 to 5 A high-efficiency purification device for the production of propionyl chloride includes a support plate 1, with multiple support legs 2 fixedly connected to the lower end of the support plate 1 and a reaction furnace 3 fixedly connected to the upper end of the support plate 1. The side wall of the reaction furnace 3 has an inlet and an outlet, and the inlet is connected to an inert gas pipe 5. The gas introduced into the inert gas pipe 5 is nitrogen. Dry nitrogen is blown into the reaction furnace 3 after the reaction. The nitrogen flow can carry away the HCl gas. Since nitrogen is an inert gas, it will not react chemically with the reactants. It can effectively remove HCl from the reaction mixture and discharge it from the reaction furnace 3 through the outlet.

[0028] Both the inlet and outlet ports on the side wall of the reactor 3 are equipped with heat-insulated one-way valves. Nitrogen gas is introduced into the reactor 3 through the inert gas pipe 5, and the gas in the reactor 3 will not flow back to the inert gas pipe 5. The gas in the reactor 3 can only flow to the purification box 4.

[0029] A purification box 4 is fixedly connected to the outside of the reactor 3 at the gas outlet. The side wall of the purification box 4 has multiple collection ports 41. The purpose of the purification box 4 is to effectively separate and purify the gas produced by the reaction. After purification, the gas enters the downstream circulation system through these collection ports. The collected nitrogen continues to be blown into the reactor 3 through the inert gas pipe 5 for recycling, which is environmentally friendly and energy-saving.

[0030] The lower end of the purification box 4 is fixedly connected to the circulation box 17, and the upper end of the circulation box 17 is provided with an opening. The purification box 4 and the circulation box 17 contain an alkaline solution. HCl gas is a strong acid gas. The alkaline solution, such as sodium hydroxide, can react chemically with HCl gas to produce soluble salts sodium chloride and water. This reaction process can efficiently remove HCl gas from the air. Therefore, the alkaline solution used in this application is a sodium hydroxide solution.

[0031] The bottom wall of the purification chamber 4 has a drain outlet 6, which facilitates the discharge of liquid during the gas purification process.

[0032] The purification chamber 4 is equipped with a stirring assembly. Specifically, the stirring assembly includes a mounting box 9 fixedly connected to the lower end of the purification chamber 4. A rotating rod 7 is rotatably connected to one end of the mounting box 9 near the drain outlet 6. Multiple paddles 8 are fixedly arranged in a ring on the shaft of the rotating rod 7. A driving bevel gear 12 is rotatably connected to the inner wall of the mounting box 9 and is coaxially fixedly connected to the rotating rod 7. The driving bevel gear 12 meshes with a driven bevel gear 13. A rotating shaft 14 is coaxially fixedly connected to the upper end of the driven bevel gear 13. A stirring shaft 10 is rotatably connected to the bottom wall of the purification chamber 4, and the lower end of the stirring shaft 10 passes through the bottom wall of the purification chamber 4. Multiple stirring rods 11 are fixedly connected in a ring on the upper shaft of the stirring shaft 10. Both the shaft of the stirring shaft 10 and the rotating shaft 14 are fixedly sleeved with sprockets 15. The outer sides of the two sprockets 15 are... A chain 16 is rotatably connected to the alkaline solution in the purification tank 4. When the alkaline solution falls through the drain outlet 6, the gravity of the falling liquid, combined with multiple paddles 8, converts its gravitational potential energy into the rotational mechanical energy of the rotating rod 7. The rotating rod 7 drives the driving bevel gear 12 to rotate, which meshes with the driven bevel gear 13, causing the driven bevel gear 13 to rotate. This, in turn, drives the rotating shaft 14, which is coaxially fixed to the upper end of the driven bevel gear 13, to rotate. Through the cooperation between the chain 16 and the two sprockets 15, the rotation of the rotating shaft 14 drives the stirring shaft 10 to rotate, which can continuously stir the alkaline solution in the purification tank 4, accelerate the contact between the solute and the solvent, and make the solute dissolution process more uniform and rapid. In addition, it can increase the contact efficiency between HCl gas and liquid, thereby improving the adsorption and purification effect of the gas.

[0033] A circulation assembly is provided between the circulation tank 17 and the purification tank 4. Specifically, the circulation assembly includes a circulation pump 18 fixedly installed at the lower end of the support plate 1. A connecting pipe is provided between the upper end of the circulation pump 18 and the circulation tank 17, and a circulation water pipe 20 is provided between the lower end of the circulation pump 18 and the liquid injection port at the upper end of the purification tank 4. A water curtain nozzle is provided at the lower end of the liquid injection port. The circulation tank 17 is used to collect the alkaline solution falling from the drain 6. The alkaline solution collected in the circulation tank 17 is lifted to the purification tank 4 by the circulation pump 18 and sprayed out in the form of a water curtain through the water curtain nozzle on the top wall of the purification tank 4. The surface tension and fluidity of water enhance the contact area between the gas and the liquid, thereby improving the adsorption efficiency. Compared with some other gas purification methods (such as high-temperature oxidation), the process of using water curtain adsorption technology is gentle, does not produce dangerous side reactions, and is safer to operate.

[0034] The circulation component greatly increases the utilization rate of alkaline solutions, which helps to save costs.

[0035] The purification tank 4 has a liquid injection port at its upper end and a liquid replacement assembly at its upper end. Specifically, the liquid replacement assembly includes an L-shaped mounting plate 23 fixedly connected to the purification tank 4. A rotary motor 24 is fixedly installed at one end of the L-shaped mounting plate 23 near the purification tank 4. A threaded rod 25 is fixedly connected to the output end of the rotary motor 24. A threaded sleeve block 26 is threadedly sleeved on the body of the threaded rod 25. A first connecting block 19 and a second connecting block 21 are fixedly connected at intervals at one end of the threaded sleeve block 26 near the liquid injection port. The first connecting block 19 is connected to the upper end of the circulating water pipe 20, and the second connecting block 21 is fixedly connected to the liquid addition pipe 22. The rotary motor 24 drives the threaded rod 25 to rotate, and the threaded sleeve block 26 slides in contact with the upper end of the purification tank 4, causing the threaded sleeve block 26 to slide horizontally on the body of the threaded rod 25, causing the first connecting block 19 to move towards the discharge box, and causing the second connecting block 21 to move towards the liquid injection port.

[0036] A discharge box is fixedly connected to the upper end of the support plate 1. When the vertical position of the liquid addition pipe 22 corresponds to the vertical position of the liquid injection port, the first connecting block 19 is located directly above the discharge box. When replacing the alkaline solution, the rotary motor 24 is started, which moves the outlet of the upper end of the circulating water pipe 20 to directly above the discharge box. At the same time, the lower end of the liquid addition pipe 22 is connected to the liquid injection port at the upper end of the purification box 4. The circulating pump 18 is started first to draw the alkaline solution in the circulating box 17 to the discharge box. Then, the alkaline solution is added to it through the liquid addition pipe 22 to ensure the adsorption effect of the alkaline solution.

[0037] The working principle of this invention is as follows:

[0038] The reaction process of propionyl chloride is carried out in reactor 3. Reactor 3 has an inlet and an outlet at the top. Nitrogen gas is blown into reactor 3 from inert gas pipe 5. The inert gas does not react chemically with the reactants and can effectively carry away HCl gas and discharge it from reactor 3 through the outlet and enter the purification box 4 for purification.

[0039] The alkaline solution inside the circulation tank 17 is lifted to the purification tank 4 by the circulation pump 18, and sprayed out in the form of a water curtain through the water curtain nozzles on the top wall of the purification tank 4. The surface tension and fluidity of water enhance the contact area between the gas and the liquid, thereby improving the adsorption efficiency.

[0040] When the alkaline solution in the purification tank 4 falls through the drain outlet 6, the gravitational force of the falling liquid, combined with multiple levers 8, converts its gravitational potential energy into the rotational mechanical energy of the rotating rod 7. The rotating rod 7 drives the active bevel gear 12 to rotate, and the active bevel gear 12 meshes with the driven bevel gear 13, driving the driven bevel gear 13 to rotate. This drives the rotating shaft 14, which is coaxially fixed to the upper end of the driven bevel gear 13, to rotate. Through the cooperation between the chain 16 and the two sprockets 15, the rotation of the rotating shaft 14 drives the stirring shaft 10 to rotate, which can continuously stir the alkaline solution in the purification tank 4.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-efficiency purification device for the production of propionyl chloride, characterized in that, Includes a support plate (1), the lower end of which is fixedly connected to multiple support legs (2), the upper end of which is fixedly connected to a reactor (3), the side wall of which has an air inlet and an air outlet, and the air inlet is connected to an inert gas pipe (5), the outer side of which is fixedly connected to a purification box (4) at the air outlet, the side wall of which has multiple collection ports (41), the lower end of which is... A circulation tank (17) is fixedly connected. The circulation tank (17) has an opening at its upper end. An alkaline solution is placed inside the purification tank (4) and the circulation tank (17). A drain outlet (6) is opened on the bottom wall of the purification tank (4). A stirring assembly is installed inside the purification tank (4). A circulation assembly is installed between the circulation tank (17) and the purification tank (4). A liquid injection port is opened at the upper end of the purification tank (4). A liquid replacement assembly is also installed at the upper end of the purification tank (4). The circulation assembly includes a circulation pump (18) fixedly installed at the lower end of the support plate (1). A connecting pipe is provided between the upper end of the circulation pump (18) and the circulation tank (17). A circulation water pipe (20) is provided between the lower end of the circulation pump (18) and the injection port (5). A water curtain nozzle is provided at the lower end of the injection port.

2. The high-efficiency purification device for the production of propionyl chloride according to claim 1, characterized in that, The stirring assembly includes a mounting box (9) fixedly connected to the lower end of the purification box (4). A rotating rod (7) is rotatably connected to one end of the mounting box (9) near the drain outlet (6). Multiple paddles (8) are fixedly arranged in a ring on the rod body of the rotating rod (7). A driving bevel gear (12) is rotatably connected to the inner wall of the mounting box (9) and is coaxially fixedly connected to the rotating rod (7). The driving bevel gear (12) meshes with a driven bevel gear (13). (13) is coaxially fixedly connected to a rotating shaft (14). The bottom wall of the purification box (4) is rotatably connected to a stirring shaft (10), and the lower end of the stirring shaft (10) passes through the bottom wall of the purification box (4). Multiple stirring rods (11) are fixedly connected to the upper shaft of the stirring shaft (14) in a ring. Both the shaft of the stirring shaft (10) and the rotating shaft (14) are fixedly sleeved with sprockets (15). The outer sides of the two sprockets (15) are rotatably sleeved with a chain (16).

3. The high-efficiency purification device for the production of propionyl chloride according to claim 1, characterized in that, The gas introduced into the inert gas tube (5) is nitrogen.

4. The high-efficiency purification device for the production of propionyl chloride according to claim 1, characterized in that, The fluid exchange assembly includes an L-shaped mounting plate (23) fixedly connected to the purification tank (4). A rotary motor (24) is fixedly installed on one end of the L-shaped mounting plate (23) near the purification tank (4). A threaded rod (25) is fixedly connected to the output end of the rotary motor (24). A threaded sleeve block (26) is threadedly sleeved on the body of the threaded rod (25). A first connecting block (19) and a second connecting block (21) are fixedly connected at intervals on one end of the threaded sleeve block (26) near the injection port. The first connecting block (19) is connected to the upper end of the circulating water pipe (20). The second connecting block (21) is fixedly connected to a liquid addition pipe (22).

5. The high-efficiency purification apparatus for the production of propionyl chloride according to claim 4, characterized in that, The upper end of the support plate (1) is fixedly connected to the discharge box. When the vertical position of the liquid filling pipe (22) corresponds to the vertical position of the liquid injection port, the first connecting block (19) is located directly above the discharge box.

6. The high-efficiency purification apparatus for the production of propionyl chloride according to claim 3, characterized in that, Both the air inlet and the air outlet are equipped with heat-insulated one-way valves.

7. The high-efficiency purification apparatus for the production of propionyl chloride according to claim 6, characterized in that, Nitrogen gas is introduced into the reactor (3) through the inert gas pipe (5), and the gas in the reactor (3) will not flow back to the inert gas pipe (5). The gas in the reactor (3) can only flow to the purification box (4).

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