Green low-carbon water alkali washing equipment for preparing monochlorodifluoromethane

Abstract

The utility model discloses green low-carbon water alkaline washing equipment for preparing monochlorodifluoromethane. The green low-carbon water alkaline washing equipment comprises a water washing tower and an alkaline washing tower, the upper end of the water washing tower is communicated with a series pipe, and the other end of the series pipe is communicated with the lower end of the alkaline washing tower; a plurality of grating plates are arranged in the water washing tower and the alkaline washing tower; fillers are arranged on the grating plates; observation windows are arranged on the water washing tower and the alkaline washing tower and are higher than the filler; a heat utilization structure is arranged between the water washing tower and the alkaline washing tower; a waste liquid utilization structure is arranged. According to the utility model, gas led out from the alkaline washing tower enters the heat exchanger to be condensed into liquid, heat release occurs in the process, water in the water storage tank circulates in the heat exchanger, the heat can be utilized and absorbed, the temperature of the water is changed, and the washing effect can be improved when the water enters the water washing and alkaline washing procedure subsequently; and waste liquid flowing out of the water washing tower can be recycled.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial production, in particular to a green low-carbon water alkali washing device for preparing difluorochloromethane. Background Art

[0002] Difluorochloromethane, also known as R22 or F22, is a chemical substance widely used in industry. It is primarily used as a refrigerant in refrigeration equipment such as commercial and central air conditioners. It is also used as a raw material for the production of polytetrafluoroethylene resin and an intermediate in fire extinguishing agents. Difluorochloromethane is also used as a physical foaming agent for polymers. Difluorochloromethane is a colorless, odorless, non-flammable and non-explosive stable gas with excellent thermal and chemical stability.

[0003] The processing equipment for chlorodifluoromethane includes a reaction tower, a water scrubber, an alkaline scrubber, a heat exchanger, and a dryer. The process is complex and energy-intensive. For example, to improve the effectiveness of spray washing, the water in the storage tank can be heated, which can enhance the adsorption treatment efficiency of the scrubber. After the spraying operation in the scrubber, wastewater is directly discharged. These factors increase energy consumption and resource waste during the processing of chlorodifluoromethane, which is inconsistent with the concept of green and low-carbon production and leaves room for improvement. Utility Model Content

[0004] The utility model aims to solve the above-mentioned technical problems of energy consumption and resource waste in the processing of difluorochloromethane, and provides a green low-carbon water alkali washing equipment for preparing difluorochloromethane.

[0005] To solve the above technical problems, the utility model provides a technical solution: a green low-carbon water alkali washing equipment for preparing difluoromonochloromethane, comprising a water washing tower and an alkali washing tower; the upper end of the water washing tower is connected to a series pipe, the other end of the series pipe is connected to the lower end of the alkali washing tower; the water washing tower and the alkali washing tower are both provided with a plurality of grid plates, and the grid plates are both provided with fillers; the water washing tower and the alkali washing tower are both provided with observation windows above the fillers;

[0006] A heat utilization structure is provided between the water washing tower and the alkali washing tower, and the heat utilization structure includes a heat exchanger connected to the alkali washing tower, the heat exchanger is connected to a water storage tank, and the water storage tank is provided with a water outlet pipe and a water inlet pipe, which are respectively connected to the water inlet and water outlet of the heat exchanger; a transfer water tank 1 is provided on the outside of the water washing tower, and a transfer water tank 2 is provided on the outside of the alkali washing tower, and water pipes are connected between the transfer water tank 1, the transfer water tank 2 and the lower end of the water storage tank; a spray pipe is connected to the transfer water tank 1 and the transfer water tank 2, and a plurality of branch pipes are connected to the spray pipes, and the branch pipes extend into the transfer water tank 1 or the transfer water tank 2 and are provided with a plurality of spray heads;

[0007] A waste liquid utilization structure is provided, which includes a liquid outlet pipe connected to the lower end of the water washing tower, the lower end of the liquid outlet pipe is connected to a hydrofluoric acid reaction tank, the lower end of the hydrofluoric acid reaction tank is provided with a filler 2, and the filler 2 is provided with silicon dioxide.

[0008] Furthermore, the water washing tower is provided with a plurality of external fans for introducing the mixed gas after the heating reaction from the reactor into the water washing tower, and then into the alkali washing tower.

[0009] Furthermore, a water pump is provided in the water storage tank and connected to the water outlet pipe; and a valve is provided on the water delivery pipe.

[0010] Furthermore, the branch pipes and the sprinkler heads are both located below the grid plate.

[0011] Furthermore, a water inlet is provided at the upper end of the water storage tank; and a liquid outlet and a valve are provided at the lower end of the hydrofluoric acid reaction tank.

[0012] The advantages of this utility model compared with the prior art are:

[0013] The gas discharged from the alkali washing tower needs to be condensed into liquid in the heat exchanger. In this process, heat will be released. The water in the water storage tank can utilize and absorb this heat after circulating in the heat exchanger, making the water warmer. The subsequent water washing and alkali washing process can improve the washing effect.

[0014] The waste liquid coming out of the water washing tower contains dilute hydrochloric acid, which contains a small amount of hydrofluoric acid. This liquid enters the hydrofluoric acid reaction tank and reacts with the silicon dioxide in the filler to produce hexafluorosilicic acid, reducing unnecessary energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the present utility model.

[0016] Figure 2 It is a schematic diagram of the internal structure of the water washing tower of the utility model.

[0017] Figure 3 It is a structural schematic diagram of a hydrofluoric acid reaction tank of the utility model.

[0018] As shown in the figure: 1. Water washing tower, 2. Alkali washing tower, 3. Series pipe, 4. Grille plate, 5. Packing, 6. Observation window, 7. Heat exchanger, 8. Water storage tank, 9. Water outlet pipe, 10. Water inlet pipe, 11. Transfer water tank 1, 12. Transfer water tank 2, 13. Water pipe, 14. Spray pipe, 15. Branch pipe, 16. Liquid outlet pipe, 17. Hydrofluoric acid reaction tank, 18. Packing 2. DETAILED DESCRIPTION

[0019] The present invention will be described in further detail below with reference to the accompanying drawings.

[0020] Example 1, combined with the attached Figure 1 A green, low-carbon, water-based alkaline washing apparatus for preparing difluorochloromethane comprises a water washing tower 1 and an alkaline washing tower 2. The upper end of the water washing tower 1 is connected to a series pipe 3, the other end of which is connected to the lower end of the alkaline washing tower 2. In practical applications, corrosion-resistant sealing materials such as rubber gaskets are required at both ends of the series pipe 3 to ensure sealing and prevent gas leakage.

[0021] Combined with attachment Figure 1 、 2 , a plurality of grid plates 4 are provided in the water washing tower 1 and the alkali washing tower 2, and fillers 5 are provided on the grid plates 4; an observation window 6 is provided on the water washing tower 1 and the alkali washing tower 2 and above the fillers 5; the fillers 5 have a large surface area and porosity and can absorb some organic and inorganic substances in the gas. These pollutants will form a film on the surface of the fillers 5 and will be gradually washed off by water;

[0022] The water washing tower 1 is provided with several external fans for introducing the mixed gas after the heating reaction from the reactor into the water washing tower 1 and then into the alkali washing tower 2, thereby improving the speed of gas circulation and processing efficiency.

[0023] Combined with attachment Figure 1 A heat utilization structure is provided between the water washing tower 1 and the alkali washing tower 2. The heat utilization structure includes a heat exchanger 7 connected to the alkali washing tower 2, and a water storage tank 8 is connected to the heat exchanger 7. The water storage tank 8 is provided with a water outlet pipe 9 and a water inlet pipe 10, which are respectively connected to the water inlet end and the water outlet end of the heat exchanger 7, so that the water in the water outlet pipe 8 can utilize the heat released when the gas extracted from the alkali washing tower 2 is condensed, and circulates and heats up in the heat exchanger 7. A water pump is provided in the water storage tank 8 and connected to the water outlet pipe 9, and a water inlet is provided at the upper end of the water storage tank 8;

[0024] A transfer water tank 1 11 is provided on the outside of the water washing tower 1, and a transfer water tank 2 12 is provided on the outside of the alkali washing tower 2. A water pipe 13 is connected between the transfer water tank 1 11, the transfer water tank 2 12 and the lower end of the water storage tank 8, and a valve is provided on the water pipe 13; a spray pipe 14 is connected to the transfer water tank 1 11 and the transfer water tank 2 12, and a plurality of branch pipes 15 are connected to the spray pipe 14. The branch pipes 15 extend into the transfer water tank 1 11 or the transfer water tank 2 12 and are provided with a plurality of spray heads. The branch pipes 15 and the spray heads are both located below the grid plate 4;

[0025] Combined with attachment Figure 1 、 3, a waste liquid utilization structure is provided, the waste liquid utilization structure includes a liquid outlet pipe 16 connected to the lower end of the water washing tower 1, the lower end of the liquid outlet pipe 16 is connected to a hydrofluoric acid reaction tank 17, the lower end of the hydrofluoric acid reaction tank 17 is provided with a liquid outlet and a valve, the lower end of the hydrofluoric acid reaction tank 17 is provided with a packing 2 18, and the packing 2 18 is provided with silicon dioxide; the waste liquid coming out of the water washing tower 1 contains dilute hydrochloric acid, which enters the hydrofluoric acid reaction tank 17 and reacts with the silicon dioxide in the packing 2 18 to generate hexafluorosilicic acid, thereby effectively utilizing the waste liquid.

[0026] The working principle of the present invention is as follows: since the gas discharged from the alkali washing tower 2 needs to be condensed into liquid in the heat exchanger 7, heat will be released in this process, and the water in the water storage tank 8 can utilize and absorb this heat after circulating in the heat exchanger 7, so that the water becomes warm, and then the warm water is continuously transported to the transfer water tank 1 11 and the transfer water tank 2 12, and sprayed out through the spray pipe 14, the branch pipe 15 and the spray head; the waste liquid coming out of the water washing tower 1 contains dilute hydrochloric acid, which contains a small amount of hydrofluoric acid. This liquid is allowed to enter the hydrofluoric acid reaction tank 17 and react with the silicon dioxide in the filler 18 to generate hexafluorosilicic acid, thereby reducing energy waste, improving economic benefits, and being more environmentally friendly.

[0027] The above description of the present invention and its embodiments is non-limiting. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design, a structure and embodiment similar to the technical solution should fall within the scope of protection of the present invention.

Claims

1. A green low-carbon water alkali washing equipment for preparing difluorochloromethane, comprising a water washing tower (1) and an alkali washing tower (2); characterized in that: The upper end of the water washing tower (1) is connected to a series pipe (3), and the other end of the series pipe (3) is connected to the lower end of the alkali washing tower (2); a plurality of grid plates (4) are provided in the water washing tower (1) and the alkali washing tower (2), and fillers (5) are provided on the grid plates (4); and observation windows (6) are provided on the water washing tower (1) and the alkali washing tower (2) and above the fillers (5); A heat utilization structure is provided between the water washing tower (1) and the alkali washing tower (2), the heat utilization structure comprising a heat exchanger (7) connected to the alkali washing tower (2), a water storage tank (8) connected to the heat exchanger (7), and a water outlet pipe (9) and a water inlet pipe (10) respectively connected to the water inlet and outlet of the heat exchanger (7); a transfer water tank (11) is provided outside the water washing tower (1), and a transfer water tank (11) is provided outside the alkali washing tower (2). Water tank 2 (12), the transfer water tank 1 (11), the transfer water tank 2 (12) and the lower end of the water storage tank (8) are all connected with a water pipe (13); the transfer water tank 1 (11) and the transfer water tank 2 (12) are all connected with a spray pipe (14), and the spray pipe (14) is connected with a plurality of branch pipes (15), and the branch pipes (15) extend into the transfer water tank 1 (11) or the transfer water tank 2 (12) and are provided with a plurality of spray heads; A waste liquid utilization structure is provided, the waste liquid utilization structure comprising a liquid outlet pipe (16) connected to the lower end of a water washing tower (1), the lower end of the liquid outlet pipe (16) being connected to a hydrofluoric acid reaction tank (17), a second filler (18) being provided at the lower end of the hydrofluoric acid reaction tank (17), and silicon dioxide being provided in the second filler (18).

2. A green low-carbon water alkali washing equipment for preparing difluorochloromethane according to claim 1, characterized in that: The water washing tower (1) is provided with a plurality of external fans for introducing the mixed gas after the heating reaction from the reactor into the water washing tower (1) and then into the alkali washing tower (2).

3. A green low-carbon water alkali washing equipment for preparing difluorochloromethane according to claim 1, characterized in that: A water pump is provided in the water storage tank (8) and connected to the water outlet pipe (9); and a valve is provided on the water delivery pipe (13).

4. A green low-carbon water alkali washing equipment for preparing difluorochloromethane according to claim 1, characterized in that: The branch pipe (15) and the sprinkler head are both located below the grid plate (4).

5. A green low-carbon water alkali washing equipment for preparing difluorochloromethane according to claim 1, characterized in that: The upper end of the water storage tank (8) is provided with a water inlet; the lower end of the hydrofluoric acid reaction tank (17) is provided with a liquid outlet and a valve.

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