Separation and recovery device for residual liquid of methane chloride crude distillation tower

Abstract

The utility model relates to the technical field, in particular to a methane chloride crude distillation tower residual liquid separation and recovery device which comprises a methane chloride crude distillation tower, the tower bottom of the methane chloride crude distillation tower is connected with a feeding port of a rectifying tower through a third pipeline, and the tower top of the rectifying tower is connected with a superheater through a first connecting pipe. The superheater is connected with a tetrachloroethylene reactor through a pipeline; a tower kettle of the rectifying tower is connected with an incinerator through a pipeline; the tower top of the rectifying tower is connected with a crude methane chloride feeding pipe through a connecting pipe II, and the crude methane chloride feeding pipe is connected with a feeding hole of a methane chloride crude distillation tower; according to the utility model, the methane chloride and the dichloromethane in the residual liquid of the methane chloride crude distillation tower can be separated and recovered, the cost is lower, the risk is small, and the damage to the environment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field, and specifically relates to a device for separating and recovering the residue liquid of a monochloromethane rough distillation tower. Background Art

[0002] When preparing monochloromethane, methanol and hydrogen chloride are used as raw materials to produce crude monochloromethane; the crude monochloromethane is distilled through a rough distillation tower, and the monochloromethane with higher purity is generated and discharged from the top of the tower; the residue liquid is left at the bottom of the tower, and the main components of the residue liquid are monochloromethane, dichloromethane, chloroethane and water; the treatment of the residue liquid is relatively difficult; one treatment method is to directly discharge the residue liquid into an incinerator for incineration treatment, which increases the production cost, and because monochloromethane is a flammable, explosive and dangerous chemical, the risk of monochloromethane during the incineration process is relatively high; another method is to absorb the residue liquid through an exhaust gas absorption tower and then discharge it, which has a high production cost and the discharged tail gas has a serious impact on the environment. Content of the Utility Model

[0003] The main purpose of the utility model is to provide a device for separating and recovering the residue liquid of a monochloromethane rough distillation tower, so as to solve the problems of high cost, high risk and environmental pollution during the treatment of the residue liquid of the monochloromethane rough distillation tower in the above-mentioned prior art.

[0004] In order to achieve the above purpose, the utility model provides a device for separating and recovering the residue liquid of a monochloromethane rough distillation tower, which includes a monochloromethane rough distillation tower. The bottom of the monochloromethane rough distillation tower is connected to the feed inlet of a rectification tower through pipeline three. The top of the rectification tower is connected to a superheater through connecting pipe one, and the superheater is connected to a tetrachloroethylene reactor through a pipeline.

[0005] Further, the bottom of the rectification tower is connected to an incinerator through a pipeline.

[0006] Further, the top of the rectification tower is connected to a crude monochloromethane feed pipe through connecting pipe two, and the crude monochloromethane feed pipe is connected to the feed inlet of the monochloromethane rough distillation tower.

[0007] Further, a demister and a compressor are sequentially arranged on the crude monochloromethane feed pipe along the material conveying direction, and the connection between connecting pipe two and the crude monochloromethane feed pipe is located between the demister and the compressor.

[0008] Further, a buffer tank is connected to pipeline three.

[0009] Further, valves are provided on both connecting pipe one and connecting pipe two.

[0010] The utility model can recover methyl chloride and methylene chloride by setting a superheater and a perchloroethylene reactor, and participate in the preparation of perchloroethylene; by setting an incinerator, it can burn and process the non-recyclable substances separated by the rectifying column; by setting a connecting pipe II, it can lead the gas containing methyl chloride back to the methyl chloride rough distillation column for recovery.

[0011] The utility model can take samples in the buffer tank to measure the contents of methyl chloride and methylene chloride in the material by setting a buffer tank; by setting valves, it can control the flow direction of the material at the top of the rectifying column to the perchloroethylene reactor or to the methyl chloride rough distillation column.

[0012] The utility model can separate and recover methyl chloride and methylene chloride in the residue of the methyl chloride rough distillation column, with low cost, small danger and reduced environmental damage. Description of the Drawings

[0013] The specification drawings forming a part of this application are used to provide a further understanding of the utility model. The schematic embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an improper limitation to the utility model.

[0014] Figure 1 It is a structural schematic diagram of a device for separating and recovering the residue of the methyl chloride rough distillation column in the embodiment;

[0015] In the figure: 1. Buffer tank; 2. Rectifying column; 3. Superheater; 4. Demister; 5. Incinerator; 6. Perchloroethylene reactor; 7. Compressor; 8. Methyl chloride rough distillation column; 9. Connecting pipe I; 10. Connecting pipe II; 11. Pipe III; 12. Crude methyl chloride feed pipe. Detailed Embodiments

[0016] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will refer to the drawings and combine with the embodiments to detail the utility model.

[0017] As Figure 1 shown, according to an embodiment of the utility model, a device for separating and recovering the residue of the methyl chloride rough distillation column is provided, including a methyl chloride rough distillation column 8. The bottom of the methyl chloride rough distillation column 8 is connected to the feed port of a rectifying column 2 through a pipe III 11. The top of the rectifying column 2 is connected to a superheater 3 through a connecting pipe I 9. The superheater 3 is connected to a perchloroethylene reactor 6 through a pipe; by setting the superheater 3 and the perchloroethylene reactor 6, methyl chloride and methylene chloride can be recovered and participate in the preparation of perchloroethylene.

[0018] The bottom of the rectifying column 2 is connected to an incinerator 5 through a pipe; by setting the incinerator 5, the non-recyclable substances separated by the rectifying column 2 can be burned and processed.

[0019] The top of the rectification column 2 is connected to the crude methyl chloride feed pipe 12 through the connecting pipe II 10, and the crude methyl chloride feed pipe 12 is connected to the feed inlet of the methyl chloride rough distillation column 8; by setting the connecting pipe II 10, the gas containing methyl chloride can be led back into the methyl chloride rough distillation column 8 for recovery.

[0020] An eliminator 4 and a compressor 7 are successively arranged on the crude methyl chloride feed pipe 12 along the material conveying direction, and the connection point of the connecting pipe II 10 and the crude methyl chloride feed pipe 12 is located between the eliminator 4 and the compressor 7; the eliminator 4 is used for filtering the material, and the compressor 7 is used for compressing and boosting the material and then entering the methyl chloride rough distillation column 8.

[0021] A buffer tank 1 is installed on the pipe III 11; valves are provided on both the connecting pipe I 9 and the connecting pipe II 10; by setting the buffer tank 1, samples can be taken inside the buffer tank 1 to measure the contents of methyl chloride and dichloromethane in the material; by setting the valves, the material flow direction at the top of the rectification column 2 can be controlled to flow to the tetrachloroethylene reactor 6 or to the methyl chloride rough distillation column 8.

[0022] The working principle of the above embodiment is as follows:

[0023] Using methanol and hydrogen chloride as raw materials, the generated crude methyl chloride is introduced into the methyl chloride rough distillation column 8 through the crude methyl chloride feed pipe 12;

[0024] The residual liquid at the bottom of the methyl chloride rough distillation column 8 enters the buffer tank 1, and the staff takes samples inside the buffer tank 1 for determination; the material in the buffer tank 1 enters the rectification column 2 for distillation separation; methyl chloride and dichloromethane are discharged and recovered from the top of the rectification column 2; chloroethane and water deposit at the bottom and cannot be recovered, and are introduced into the incinerator 5 for combustion;

[0025] When the content of methyl chloride measured by sampling inside the buffer tank 1 is greater than the content of dichloromethane, the material flow direction at the top of the rectification column 2 is controlled to flow to the methyl chloride rough distillation column 8 to recover methyl chloride, and dichloromethane continues to return to the buffer tank 1; when the content of methyl chloride measured by sampling inside the buffer tank 1 is less than the content of dichloromethane, the material flow direction at the top of the rectification column 2 is controlled to flow to the tetrachloroethylene reactor 6 to recover methyl chloride and dichloromethane and participate in the preparation of tetrachloroethylene.

[0026] This embodiment can separate and recover methyl chloride and dichloromethane in the residual liquid of the methyl chloride rough distillation column, with low cost, small danger and reduced environmental damage.

[0027] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A chloromethane crude distillation tower residual liquid separation and recovery device, comprising a chloromethane crude distillation tower (8), characterized in that: The bottom of the crude methyl chloride distillation tower (8) is connected to the feed inlet of the distillation tower (2) via a pipeline three (11), and the top of the distillation tower (2) is connected to a superheater (3) via a connecting pipe one (9), and the superheater (3) is connected to a tetrachloroethylene reactor (6) via a pipeline.

2. The methyl chloride crude distillation tower residual liquid separation and recovery device according to claim 1, characterized in that: The bottom of the distillation tower (2) is connected to an incinerator (5) via a pipeline.

3. The methyl chloride crude distillation tower residual liquid separation and recovery device according to claim 1, characterized in that: The top of the distillation tower (2) is connected to a crude methyl chloroethane feed pipe (12) via a second connecting pipe (10), and the crude methyl chloroethane feed pipe (12) is connected to a feed port of a crude methyl chloroethane distillation tower (8).

4. The methyl chloride crude distillation tower residual liquid separation and recovery device according to claim 3, characterized in that: A demister (4) and a compressor (7) are sequentially arranged on the crude methyl chloride feed pipe (12) along the material conveying direction, and the connection point between the second connecting pipe (10) and the crude methyl chloride feed pipe (12) is located between the demister (4) and the compressor (7).

5. The methyl chloride crude distillation tower residual liquid separation and recovery device according to claim 1, characterized in that: The pipeline three (11) is connected to a buffer tank (1).

6. The methyl chloride crude distillation tower residual liquid separation and recovery device according to claim 1, characterized in that: The connecting pipe 1 (9) and the connecting pipe 2 (10) are both provided with valves.

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