Novel difluoromethane tubular reactor preparation production line

Abstract

The novel difluoromethane tubular reactor preparation production line comprises a first preparation tank, a second preparation tank and a third preparation tank which are sequentially arranged, the first preparation tank is connected with a first flow dividing pipe, the second preparation tank is connected with a second flow dividing pipe, and the third preparation tank is connected with a third flow dividing pipe. The first flow dividing pipe, the second flow dividing pipe and the third flow dividing pipe are converged and connected to a main pipe; comprising a tubular reactor, a header pipe extends into the tubular reactor and is provided with a first discharging pipe, the first discharging pipe is connected to a flash evaporation assembly, the top of the flash evaporation assembly is provided with a second discharging pipe, the second discharging pipe is connected to a washing assembly, the top of the washing assembly is provided with a third discharging pipe, and the third discharging pipe is connected to the flash evaporation assembly. And the third discharging pipe is connected to a storage assembly. The reactor enhances mass and heat transfer effects, reduces the corrosion rate of the reactor, reduces the amount of three wastes discharged in the reaction, and is energy-saving and environment-friendly.

Description

Technical Field

[0001] The utility model relates to the technical field of difluoromethane production lines, and particularly relates to a production line for preparing a novel difluoromethane tubular reactor. Background Art

[0002] The fluorochemical industry is a sunrise industry. Due to their excellent performance, the application fields of fluorochemical products are constantly expanding, and they are becoming new growth points in the chemical industry. During the production process of difluoromethane (R32), there have always been serious problems such as severe system corrosion and frequent perforation of the reaction kettle (the normal service life of the reaction kettle is 8 - 12 months), resulting in equipment loss, material waste, etc. Compared with the liquid-phase fluorination process, the gas-phase fluorination process has less corrosion and generally uses a fixed-bed reactor, and the research direction focuses on catalyst development. However, the reaction temperature of the gas-phase fluorination process is relatively high, usually above 250°C, and there are problems such as easy oxidation of chlorinated hydrocarbons and easy coking and deactivation of the catalyst. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a production line for preparing a novel difluoromethane tubular reactor, which enhances the mass transfer and heat transfer effects, reduces the corrosion rate of the reactor, reduces the amount of three wastes discharged during the reaction, and saves energy and protects the environment.

[0004] To solve the above technical problems, the utility model provides a production line for preparing a novel difluoromethane tubular reactor, which includes a first preparation tank, a second preparation tank, and a third preparation tank arranged in sequence. The first preparation tank is connected with a first shunt pipe, the second preparation tank is connected with a second shunt pipe, and the third preparation tank is connected with a third shunt pipe. The first shunt pipe, the second shunt pipe, and the third shunt pipe converge and are connected to a main pipe; it includes a tubular reactor. The main pipe extends into the interior of the tubular reactor and is provided with a first discharge pipe. The first discharge pipe is connected to a flash evaporation assembly. A second discharge pipe is arranged at the top of the flash evaporation assembly. The second discharge pipe is connected to a washing assembly. A third discharge pipe is arranged at the top of the washing assembly. The third discharge pipe is connected to a storage assembly.

[0005] Further, feeding pump bodies are arranged on the first shunt pipe, the second shunt pipe, and the third shunt pipe, and feeding valves are arranged on both sides of the feeding pump bodies.

[0006] Further, a heating assembly is arranged inside the tubular reactor.

[0007] Further, an auxiliary discharge pipe is arranged on the side of the flash evaporation assembly. The auxiliary discharge pipe is connected to the main pipe through an auxiliary pump body, and auxiliary valves are arranged on both sides of the auxiliary pump body.

[0008] Further, a cleaning pipeline is arranged at the bottom of the flash evaporation assembly, and a cleaning valve is arranged on the cleaning pipeline.

[0009] Further, an alkali washing pipeline is provided on one side of the washing assembly, and the alkali washing pipeline is connected to an external alkali solution tank.

[0010] Further, dichloromethane is stored in the first preparation tank, antimony pentachloride is stored in the second preparation tank, and hydrogen fluoride is stored in the third preparation tank.

[0011] The beneficial effects of the present utility model: When preparing this product, the feeding speed of the first preparation tank, the second preparation tank, and the third preparation tank is adjusted by the power of the feeding pump body, and enters the tubular reactor through the main pipe for reaction. At the same time, the heating assembly inside the tubular reactor is started to heat and adjust to the appropriate reaction temperature. After the reaction is completed, it enters the flash evaporation assembly through the first discharge pipe for flash evaporation operation. The gas generated by the flash evaporation operation enters the washing assembly through the second discharge pipe at the top for washing. After washing, it enters the storage assembly through the third discharge pipe to obtain the product. Description of the Drawings

[0012] Figure 1 is the overall structural schematic diagram of the present utility model.

[0013] Explanation of the reference numerals in the figure: 1. First preparation tank; 2. Second preparation tank; 3. Third preparation tank; 4. First shunt pipe; 5. Second shunt pipe; 6. Third shunt pipe; 7. Main pipe; 8. Tubular reactor; 9. First discharge pipe; 10. Flash evaporation assembly; 11. Second discharge pipe; 12. Washing assembly; 13. Third discharge pipe; 14. Storage assembly; 15. Feeding pump body; 16. Feeding valve; 17. Heating assembly; 18. Auxiliary discharge pipe; 19. Auxiliary pump body; 20. Auxiliary valve; 21. Cleaning pipeline; 22. Cleaning valve; 23. Alkali washing pipeline; 24. Alkali solution tank; 25. Waste water pipeline. Detailed Embodiments

[0014] The following further illustrates the present utility model in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and be able to implement it, but the embodiments cited do not limit the present utility model.

[0015] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

[0016] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0017] In the present utility model, unless otherwise clearly defined and limited, terms such as "installed", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0018] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0019] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0020] Refer to Figure 1As shown in the figure, an embodiment of a production line for preparing a novel difluoromethane tubular reactor of the present utility model includes a first preparation tank 1, a second preparation tank 2, and a third preparation tank 3 arranged in sequence. The first preparation tank 1 is connected to a first shunt pipe 4, the second preparation tank 2 is connected to a second shunt pipe 5, and the third preparation tank 3 is connected to a third shunt pipe 6. The first shunt pipe 4, the second shunt pipe 5, and the third shunt pipe 6 converge and are connected to a main pipe 7. It includes a tubular reactor 8. The main pipe 7 extends into the interior of the tubular reactor 8 and is provided with a first discharge pipe 9. The first discharge pipe 9 is connected to a flash evaporation assembly 10. The top of the flash evaporation assembly 10 is provided with a second discharge pipe 11. The second discharge pipe 11 is connected to a washing assembly 12. The top of the washing assembly 12 is provided with a third discharge pipe 13. The third discharge pipe 13 is connected to a storage assembly 14.

[0021] During preparation, the feeding speeds of the first preparation tank 1, the second preparation tank 2, and the third preparation tank 3 are adjusted by the power of the feeding pump body 15, enter the tubular reactor 8 through the main pipe 7 for reaction, and at the same time, the heating assembly 17 inside the tubular reactor 8 is started to adjust the temperature to a suitable reaction temperature. After the reaction is completed, it enters the flash evaporation assembly 10 through the first discharge pipe 9 for flash evaporation operation. The gas generated by the flash evaporation operation enters the washing assembly 12 through the second discharge pipe 11 at the top for washing. After washing is completed, it enters the storage assembly 14 through the third discharge pipe 13 to obtain the product.

[0022] Feeding pump bodies 15 are provided on each of the first shunt pipe 4, the second shunt pipe 5, and the third shunt pipe 6. Feeding valves 16 are provided on both sides of the feeding pump body 15 to control the feeding speed and the opening and closing of the pipeline in real time.

[0023] An auxiliary discharge pipe 18 is provided on the side of the flash evaporation assembly 10. The auxiliary discharge pipe 18 is connected to the main pipe 7 through an auxiliary pump body 19. Auxiliary valves 20 are provided on both sides of the auxiliary pump body 19. The liquid generated by the flash evaporation operation is recycled through the auxiliary discharge pipe 18 and returned to the main pipe 7 to continue the reaction. The auxiliary valves 20 are used to open and close the pipeline.

[0024] A cleaning pipeline 21 is provided at the bottom of the flash evaporation assembly 10. A cleaning valve 22 is provided on the cleaning pipeline 21 to discharge part of the solid particles to prevent them from affecting the flash evaporation reaction.

[0025] An alkali washing pipeline 23 is provided on one side of the washing assembly 12. The alkali washing pipeline 23 is connected to an external alkali liquid tank 24. A waste water pipeline 25 is provided at the bottom of the washing assembly 12 for discharging waste water.

[0026] Dichloromethane is stored in the first preparation tank 1, antimony pentachloride is stored in the second preparation tank 2, and hydrogen fluoride is stored in the third preparation tank 3 as the reaction precursor raw materials.

[0027] The above-described embodiments are merely preferred embodiments given to fully illustrate the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art in the technical field of the present utility model on the basis of the present utility model are all within the protection scope of the present utility model. The protection scope of the present utility model shall be subject to the claims.

Claims

1. A novel difluoromethane tubular reactor production line, characterized in that: The invention comprises a first preparation tank (1), a second preparation tank (2) and a third preparation tank (3) which are arranged in sequence, wherein the first preparation tank (1) is connected to a first shunt pipe (4), the second preparation tank (2) is connected to a second shunt pipe (5), the third preparation tank (3) is connected to a third shunt pipe (6), and the first shunt pipe (4), the second shunt pipe (5) and the third shunt pipe (6) are connected to a main pipe (7); The invention comprises a tubular reactor (8), wherein the main pipe (7) extends to the interior of the tubular reactor (8) and is provided with a first discharge pipe (9), wherein the first discharge pipe (9) is connected to a flash component (10), wherein a second discharge pipe (11) is provided at the top of the flash component (10), wherein the second discharge pipe (11) is connected to a washing component (12), wherein a third discharge pipe (13) is provided at the top of the washing component (12), and wherein the third discharge pipe (13) is connected to a storage component (14).

2. The novel difluoromethane tubular reactor production line according to claim 1, characterized in that: The first shunt pipe (4), the second shunt pipe (5) and the third shunt pipe (6) are all provided with a feeding pump body (15), and both sides of the feeding pump body (15) are provided with a feeding valve (16).

3. The novel difluoromethane tubular reactor production line according to claim 1, characterized in that: A heating component (17) is arranged inside the tubular reactor (8).

4. The novel difluoromethane tubular reactor production line according to claim 1, characterized in that: An auxiliary discharge pipe (18) is provided on the side of the flash assembly (10), and the auxiliary discharge pipe (18) is connected to the main pipe (7) through an auxiliary pump body (19), and auxiliary valves (20) are provided on both sides of the auxiliary pump body (19).

5. The novel difluoromethane tubular reactor production line according to claim 1, characterized in that: A cleaning pipeline (21) is provided at the bottom of the flash vaporization assembly (10), and a cleaning valve (22) is provided on the cleaning pipeline (21).

6. The novel difluoromethane tubular reactor production line according to claim 1, characterized in that: An alkali washing pipeline (23) is arranged on one side of the washing component (12), and the alkali washing pipeline (23) is connected to an external alkali liquid tank (24). A waste water pipeline (25) is arranged at the bottom of the washing component (12).

7. The novel difluoromethane tubular reactor production line according to claim 1, characterized in that: The first preparation tank (1) stores dichloromethane, the second preparation tank (2) stores antimony pentachloride, and the third preparation tank (3) stores hydrogen fluoride.

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