A system for efficiently recovering methyl chloride

Abstract

The utility model discloses a system for efficiently recovering methyl chloride, comprising a wind compressor buffer tank, a wind compressor, a high-pressure distillation tower and a condenser. A guide slide is axially arranged on the inner wall of an outer shell of the condenser, a first guide slide groove matching the guide slide is arranged on a perforated plate, and installation and disassembly of each group of heat exchange tubes are convenient. A first sealing inner tube and a second sealing inner tube are arranged in a first end cap and a second end cap, which are tightly sleeved in the outer shell and have better sealing performance. An annular sealing gasket is arranged on the inner wall of the outer shell, and the sealing gasket is placed between adjacent perforated plates, and connection between each group of heat exchange tubes is convenient. A plurality of "J"-shaped drip columns are arranged on the heat exchange tubes, which are convenient for rapid dripping of liquid, reduce adhesion time and improve heat exchange efficiency. A gas distribution cavity is arranged to quickly and evenly disperse the gas into the condenser, perform rapid condensation and improve condensation efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical production and environmental protection, and specifically relates to a system for efficiently recovering methyl chloride. Background Art

[0002] Methyl chloride is a common organic compound, which is widely used in the fields of chemical industry, medicine, pesticide, etc. In the production process, the tail gas emission of methyl chloride not only causes environmental pollution, but also wastes resources. Therefore, how to efficiently recover methyl chloride has become a problem to be solved. At present, there are some methods for recovering methyl chloride, such as adsorption method, condensation method, membrane separation method, etc., but these methods have problems such as poor absorption effect, low reaction conversion rate, and complicated operation, which are difficult to meet the needs of industrial production. Since the interior of the existing condenser is usually sealed by welding, more attachments will be produced on the outside of the exchange tube after long-term use inside, which directly affects the processing effect of the condenser, and the existing device cannot be disassembled to clean the inside. The utility model provides a system for efficiently recovering methyl chloride, which has no exhaust gas emission during normal operation of the system process, realizes clean emission of the device, improves the recovery rate of methyl chloride, and solves the technical problem of internal cleaning. Summary of the invention

[0003] In order to solve the above problems, the utility model discloses a system for efficiently recovering methyl chloride. The system has no waste gas emissions during normal operation, achieves clean emissions from the device, improves the recovery rate of methyl chloride, and solves the technical problem of internal cleaning.

[0004] In order to achieve the above object, the technical solution of the utility model is as follows:

[0005] A system for efficiently recovering monochloromethane comprises a wind compressor buffer tank, a wind compressor, a high-pressure distillation tower and a condenser, wherein the wind compressor buffer tank is connected to the wind compressor, the wind compressor is connected to the high-pressure distillation tower, the air outlet at the top of the distillation tower is connected to the condenser, and the air outlet of the condenser is connected to an alkali washing system; the condenser comprises an outer shell, a first end cap and a second end cap are arranged at both ends of the outer shell, two or more groups of heat exchange tubes are arranged in the outer shell, orifice plates are arranged at both ends of a group of heat exchange tubes, guide slides are arranged axially on the inner wall of the outer shell, a first guide slide groove matching the guide slide is arranged on the orifice plate, a gas distribution chamber and a condensate outlet are arranged at the bottom of the outer shell, an air outlet is arranged at the upper part of the outer shell, an air inlet is arranged at the bottom of the gas distribution chamber, a cold liquid inlet is arranged on the first end cap, and a cold liquid outlet is arranged on the second end cap.

[0006] Furthermore, a plurality of support rods are arranged between the orifice plates at both ends of the group of heat exchange tubes.

[0007] Furthermore, an annular sealing gasket is arranged on the inner wall of the outer shell, and the sealing gasket is placed between adjacent orifice plates.

[0008] Furthermore, the first head includes a first sealing cover, a cold liquid inlet is arranged on the outer end surface of the first sealing cover, a first sealing inner tube is arranged on the inner end surface of the first sealing cover, the first sealing inner tube is arranged on the second guide slide groove matching the guide slide bar, the first sealing inner tube is tightly sleeved in the outer shell, an annular first positioning plate is arranged on the outer ring of the first sealing cover, and a plurality of bolt holes are arranged on the first positioning plate, and the positioning plate is bolted to the outer shell.

[0009] Furthermore, the second head includes a second sealing cover, a cold liquid outlet is arranged on the outer end surface of the second sealing cover, a second sealing inner tube is arranged on the inner end surface of the second sealing cover, the second sealing inner tube is arranged on the third guide groove matching the guide slide bar, the second sealing inner tube is tightly sleeved in the outer shell, an annular second positioning plate is arranged on the outer ring of the second sealing cover, and a plurality of bolt holes are arranged on the second positioning plate, and the positioning plate is bolted to the outer shell.

[0010] Furthermore, a plurality of “J” shaped drip columns are arranged on the heat exchange tube.

[0011] Furthermore, the gas distribution chamber includes a gas distribution shell, an air inlet is arranged at the bottom of the gas distribution shell, a plurality of gas distribution pipes are arranged in the gas distribution shell, the gas distribution pipes are placed on both sides of the air inlet, the gas distribution pipes are connected to the outer shell, and a solenoid valve is arranged in the gas distribution pipes.

[0012] Further, the diameter of the orifice plate is the same as the inner diameter of the outer shell.

[0013] The utility model adopts the above-mentioned method of efficiently recovering chloromethane system to recover chloromethane waste gas, which mainly includes four steps: waste gas compression, condensation recovery, high-pressure tower distillation and alkali solution absorption. First, the reaction kettle gas is discharged to the air compressor buffer tank, and the air compressor pressurizes the chloromethane waste gas. Then the compressed waste gas is cooled through a high-pressure distillation tower and a condenser to obtain condensed chloromethane liquid and non-condensable gas containing chloromethane. The condensed chloromethane liquid is recovered, and the non-condensable gas containing chloromethane is recovered by high-pressure tower distillation. The final non-condensable gas is absorbed with alkali solution, and the liquid chloromethane is transported to the front reaction section through a delivery pump.

[0014] The beneficial effects of the utility model are:

[0015] The utility model discloses a system for efficiently recovering methyl chloride, comprising a wind compressor buffer tank, a wind compressor, a high-pressure distillation tower and a condenser. A guide slide is axially arranged on the inner wall of an outer shell of the condenser, a first guide slide groove matching the guide slide is arranged on a perforated plate, and installation and disassembly of each group of heat exchange tubes are convenient. A first sealing inner tube and a second sealing inner tube are arranged in a first end cap and a second end cap, which are tightly sleeved in the outer shell and have better sealing performance. An annular sealing gasket is arranged on the inner wall of the outer shell, and the sealing gasket is placed between adjacent perforated plates, and connection between each group of heat exchange tubes is convenient. A plurality of "J"-shaped drip columns are arranged on the heat exchange tubes, which are convenient for rapid dripping of liquid, reduce adhesion time and improve heat exchange efficiency. A gas distribution cavity is arranged to quickly and evenly disperse the gas into the condenser, perform rapid condensation and improve condensation efficiency.

[0016] The utility model system has high recovery efficiency and can realize efficient recovery of chloromethane; the recovery method of the utility model does not need to use additional chemical reagents, reducing secondary pollution. The process has no waste gas emission during normal operation, realizes clean emission of the device, and also improves the recovery rate of chloromethane. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of a system for efficiently recovering methyl chloride according to the utility model;

[0018] Figure 2 It is a three-dimensional structural schematic diagram of the condenser of the utility model;

[0019] Figure 3 It is a schematic diagram of the three-dimensional structure of the dispersed condenser of the utility model;

[0020] Figure 4 It is a schematic diagram of the structure of two groups of heat exchange tubes of the utility model;

[0021] Figure 5 It is a partial enlarged view of the heat exchange tube of the utility model;

[0022] Figure 6 For this utility model Figure 3 Schematic diagram of the middle AA section;

[0023] List of Figure Symbols:

[0024] 1. Outer shell; 2. First end cap; 3. Second end cap; 4. Gas distribution chamber; 5. Condensate outlet; 6. Air inlet; 7. Air outlet; 8. Cold liquid inlet; 9. Cold liquid outlet; 10. Second sealed inner tube; 11. First sealed inner tube; 12. Guide slide; 13. Third guide slide groove; 14. Second guide slide groove; 15. First positioning plate; 16. Second positioning plate; 17. Orifice plate; 18. Heat exchange tube; 19. Support rod; 20. First guide slide groove; 21. Drip column; 22. Annular sealing gasket; 23. Gas distribution pipe; A. Wind compressor buffer tank; B. Wind compressor; C. High-pressure distillation tower; D. Condenser. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific implementations. It should be understood that the following specific implementations are only used to illustrate the present invention and are not used to limit the scope of the present invention. Example 1

[0026] like Figure 1-6 As shown, a system for efficiently recovering monochloromethane comprises a buffer tank A of a wind compressor B, a wind compressor B, a high-pressure distillation tower C, and a condenser D. The buffer tank A of the wind compressor B is connected to the wind compressor B, the wind compressor B is connected to the high-pressure distillation tower C, the gas outlet 7 at the top of the distillation tower is connected to the condenser D, and the gas outlet 7 of the condenser D is connected to the alkali washing system; the condenser D comprises an outer shell 1, a first head 2 and a second head 3 are arranged at both ends of the outer shell 1, two groups of heat exchange tubes 18 are arranged in the outer shell 1, and the heat exchange tubes A plurality of "J"-shaped drop columns 21 are arranged on 18, a group of heat exchange tubes 18 are provided with orifice plates 17 at both ends, a guide slide bar 12 is arranged along the axial direction on the inner wall of the outer shell 1, a first guide slide groove 20 matching the guide slide bar 12 is arranged on the orifice plate 17, a gas distribution cavity 4 and a condensate outlet 5 are arranged at the bottom of the outer shell 1, an air outlet 7 is arranged at the upper part of the outer shell 1, an air inlet 6 is arranged at the bottom of the gas distribution cavity 4, a cold liquid inlet 8 is arranged on the first end cap 2, and a cold liquid outlet 9 is arranged on the second end cap 3. The diameter of the orifice plate 17 is the same as the inner diameter of the outer shell 1.

[0027] Four support rods 19 are arranged between the orifice plates 17 at both ends of a group of heat exchange tubes 18 .

[0028] An annular sealing gasket 22 is disposed on the inner wall of the outer shell 1 , and the sealing gasket is placed between adjacent orifice plates 17 .

[0029] The first head 2 includes a first sealing cover, a cold liquid inlet 8 is arranged on the outer end surface of the first sealing cover, a first sealing inner tube 11 is arranged on the inner end surface of the first sealing cover, the first sealing inner tube 11 is provided with a second guide groove 14 matching the guide slide 12, the first sealing inner tube 11 is tightly sleeved in the outer shell 1, and an annular first positioning plate 15 is arranged on the outer ring of the first sealing cover, and a plurality of bolt holes are arranged on the first positioning plate 15, and the positioning plate is bolted to the outer shell 1.

[0030] The second end cover 3 includes a second sealing cover, a cold liquid outlet 9 is arranged on the outer end surface of the second sealing cover, a second sealing inner tube 10 is arranged on the inner end surface of the second sealing cover, the second sealing inner tube 10 is provided with a third guide groove 13 matching the guide slide 12, the second sealing inner tube 10 is tightly sleeved in the outer shell 1, an annular second positioning plate 16 is arranged on the outer ring of the second sealing cover, and a plurality of bolt holes are arranged on the second positioning plate 16, and the positioning plate is bolted to the outer shell 1.

[0031] The gas distribution chamber 4 includes a gas distribution shell, an air inlet 6 is arranged at the bottom of the gas distribution shell, and multiple gas distribution pipes 23 are arranged in the gas distribution shell. The gas distribution pipes 23 are placed on both sides of the air inlet 6. The gas distribution pipes 23 are connected to the outer shell 1, and a solenoid valve is arranged in the gas distribution pipes 23.

[0032] Working principle:

[0033] Take a chemical plant as an example. The plant generates a large amount of chloromethane waste gas during the production process. After adopting the recovery method of the utility model, not only the efficient recovery of chloromethane is achieved, but also the scale of subsequent devices and the use of auxiliary materials are reduced, achieving energy saving and consumption reduction. At the same time, the recovered chloromethane liquid can be reused as a raw material, achieving effective utilization of resources.

[0034] The method for recovering chloromethane waste gas by using the above-mentioned system for efficiently recovering chloromethane mainly includes four steps: waste gas compression, condensation recovery, high-pressure tower distillation and alkali solution absorption. First, the reaction kettle gas is discharged to the air compressor buffer tank A, and the air compressor B pressurizes the chloromethane waste gas. Then, the compressed waste gas is cooled to 20-50°C through the high-pressure distillation tower C and the condenser D to obtain condensed chloromethane liquid and non-condensable gas containing chloromethane. The condensed chloromethane liquid is recovered, and the non-condensable gas containing chloromethane is recovered by high-pressure tower distillation. The final non-condensable gas is absorbed with alkali solution, and the liquid chloromethane is transported to the front reaction section by a delivery pump.

[0035] The buffer tank is filled with 1 / 4 volume of acetonitrile; the kettle gas is pressurized to 2-3 bar; the alkali concentration in the alkali washing system is 32%.

[0036] The process has no waste gas emissions during normal operation, achieving clean emissions from the device and improving the recovery rate of chloromethane. It can achieve efficient recovery of chloromethane, with a recovery rate of more than 95%. At the same time, due to the use of cycle compression, high-pressure distillation, and efficient condensation technology, the scale of subsequent devices can be reduced, the use of auxiliary materials can be reduced, and energy saving and consumption reduction can be achieved.

[0037] It should be noted that the above content only illustrates the technical idea of ​​the utility model and cannot be used to limit the protection scope of the utility model. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model. These improvements and modifications all fall within the protection scope of the claims of the utility model.

Claims

1. A system for efficiently recovering methyl chloride, characterized in that: It includes a wind compressor buffer tank, a wind compressor, a high-pressure distillation tower, and a condenser. The wind compressor buffer tank is connected to the wind compressor, which is connected to the high-pressure distillation tower. The air outlet at the top of the distillation tower is connected to the condenser, and the air outlet of the condenser is connected to the alkali washing system; the condenser includes an outer shell, a first head and a second head are arranged at both ends of the outer shell, two or more groups of heat exchange tubes are arranged in the outer shell, orifice plates are arranged at both ends of a group of heat exchange tubes, guide slides are arranged axially on the inner wall of the outer shell, a first guide slide groove matching the guide slide is arranged on the orifice plate, a gas distribution cavity and a condensate outlet are arranged at the bottom of the outer shell, an air outlet is arranged on the upper part of the outer shell, an air inlet is arranged at the bottom of the gas distribution cavity, a cold liquid inlet is arranged on the first head, and a cold liquid outlet is arranged on the second head.

2. A system for efficiently recovering methyl chloride according to claim 1, characterized in that: A plurality of support rods are arranged between the orifice plates at both ends of the group of heat exchange tubes.

3. A system for efficiently recovering methyl chloride according to claim 1, characterized in that: An annular sealing gasket is arranged on the inner wall of the shell, and the sealing gasket is placed between adjacent orifice plates.

4. The system for efficiently recovering methyl chloride according to claim 1, characterized in that: The first head includes a first sealing cover, a cold liquid inlet is arranged on the outer end surface of the first sealing cover, a first sealing inner tube is arranged on the inner end surface of the first sealing cover, the first sealing inner tube is arranged on the second guide slide groove matching the guide slide bar, the first sealing inner tube is tightly sleeved in the outer shell, an annular first positioning plate is arranged on the outer ring of the first sealing cover, a plurality of bolt holes are arranged on the first positioning plate, and the positioning plate is bolted to the outer shell.

5. The system for efficiently recovering methyl chloride according to claim 1, characterized in that: The second head includes a second sealing cover, a cold liquid outlet is arranged on the outer end surface of the second sealing cover, a second sealing inner tube is arranged on the inner end surface of the second sealing cover, the second sealing inner tube is arranged on the third guide slide groove matching the guide slide bar, the second sealing inner tube is tightly sleeved in the outer shell, an annular second positioning plate is arranged on the outer ring of the second sealing cover, a plurality of bolt holes are arranged on the second positioning plate, and the positioning plate is bolted to the outer shell.

6. The system for efficiently recovering methyl chloride according to claim 1, characterized in that: A plurality of "J"-shaped drop columns are arranged on the heat exchange tube.

7. The system for efficiently recovering methyl chloride according to claim 1, characterized in that: The gas distribution chamber includes a gas distribution shell, an air inlet is arranged at the bottom of the gas distribution shell, a plurality of gas distribution pipes are arranged in the gas distribution shell, the gas distribution pipes are placed on both sides of the air inlet, the gas distribution pipes are connected to the outer shell, and a solenoid valve is arranged in the gas distribution pipes.

8. The system for efficiently recovering methyl chloride according to claim 1, characterized in that: The orifice plate diameter is the same as the inner diameter of the shell.

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