Cooling recovery device for 2-chloro-6-trichloromethylpyridine

Abstract

The utility model discloses a 2-chloro-6-trichloromethylpyridine cooling recovery device, and relates to the field of fine chemical engineering. The 2-chloro-6-trichloromethylpyridine cooling and recycling device comprises a tank body and a tank cover detachably connected to the tank body, an inner cooling plate is arranged at the upper end in the tank body, the inner cooling plate is cylindrical, the inner cooling plate is fixedly connected to the tank cover, and an outer cooling plate is arranged at the lower end of the tank body. A low-temperature water input pipe and a low-temperature water output pipe which are communicated with the inner cooling plate are fixedly mounted on the tank cover; the gas conveying pipe and the exhaust pipe are fixedly connected to the tank cover and communicated with the tank body, and the gas conveying pipe and the cylindrical inner cooling plate are coaxially arranged; the outer cooling jacket is fixedly connected to the outer wall of the lower end part of the tank body; according to the utility model, through the inner cooling plate and the outer cooling jacket, 2-chloro-6-trichloromethylpyridine can be fully contacted with the inner cooling plate and the outer cooling jacket for cooling, so that the recovery rate of materials is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of fine chemical industry, and specifically relates to a cooling and recovery device for 2-chloro-6-trichloromethylpyridine. Background Art

[0002] 2-Chloro-6-trichloromethylpyridine uses 2-methylpyridine and chlorine as starting materials, trifluoromethylchlorobenzene as solvent, and trifluoromethylchlorobenzene solvent is used to prepare 2-methylpyridine into liquid raw materials. The liquid raw materials are continuously added at a temperature of 160℃ to 240℃ and under the irradiation of ultraviolet light for liquid-phase photochlorination reaction to obtain 2-chloro-6-trichloromethylpyridine solution, followed by high-temperature distillation to obtain a pure product. This project requires high temperature as the basis for the reaction, and high temperature causes 2-chloro-6-trichloromethylpyridine to partially vaporize and become gas.

[0003] The original cooling storage tank only has an external cooling water jacket, with a small cooling area and poor cooling effect. 2-chloro-6-trichloromethylpyridine cannot be intercepted and cooled for recovery in large quantities, and a large amount of material cannot be recovered and entered into subsequent devices, causing equipment damage. In view of this, the present utility model is specially proposed. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a 2-chloro-6-trichloromethylpyridine cooling and recovery device which can overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the utility model is:

[0006] A 2-chloro-6-trichloromethylpyridine cooling and recovery device comprises a tank body and a tank cover detachably connected to the tank body, wherein an inner cooling plate is arranged at the upper end of the tank body, the inner cooling plate is arranged in a cylindrical shape, the inner cooling plate is fixedly connected to the tank cover, and a low-temperature water input pipe and a low-temperature water output pipe connected to the inner cooling plate are fixedly installed on the tank cover; an air supply pipe and an exhaust pipe are fixedly connected to the tank cover and connected to the tank body, wherein the air supply pipe is coaxially arranged with the inner cooling plate arranged in a cylindrical shape; and an external cooling jacket is fixedly connected to the outer wall of the lower end of the tank body.

[0007] In order to facilitate installation or removal of the tank cover, preferably, the tank cover is detachably connected to the tank body via a plurality of fixing bolts.

[0008] Preferably, a water outlet pipe is fixedly connected to the side wall of the upper end of the outer cooling jacket, and a water injection pipe is fixedly connected to the lower end of the outer cooling jacket.

[0009] Furthermore, the water outlet pipe and the water injection pipe are fixedly installed with three-way joints, the three-way joints on the water injection pipe are respectively connected to the external cold water pipe and hot water pipe, and the three-way joints on the water outlet pipe are respectively connected to the external cold water tank and hot water tank through a hose.

[0010] In order to facilitate the discharge of the liquefied material from the tank body, further, a discharge pipe is fixedly connected to the bottom of the tank body.

[0011] Furthermore, the discharge pipe, cold water pipe, hot water pipe, hose, gas pipe, exhaust pipe, low-temperature water input pipe and low-temperature water output pipe are all provided with valve switches.

[0012] Preferably, the tank body is provided with a pressure gauge interface and a thermometer interface.

[0013] After adopting the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0014] The utility model uses an inner cooling plate and an outer cooling jacket, so that 2-chloro-6-trichloromethylpyridine can fully contact with the inner cooling plate and the outer cooling jacket for cooling, thereby improving the recovery rate of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of the tank body, tank cover, inner cooling plate and outer cooling jacket of the utility model;

[0016] Figure 2 It is a cross-sectional view of the utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the utility model Figure 1 ;

[0018] Figure 4 This is a schematic diagram of the structure of the utility model Figure 2 .

[0019] In the figure: 1. tank body; 101. tank cover; 102. fixing bolts; 103. gas pipe; 104. exhaust pipe; 105. discharge pipe; 2. inner cooling plate; 201. low-temperature water input pipe; 202. low-temperature water output pipe; 3. outer cooling jacket; 301. water outlet pipe; 302. water injection pipe; 303. three-way joint; 4. pressure gauge interface; 401. thermometer interface. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0021] Embodiment 1:

[0022] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 The 2-chloro-6-trichloromethylpyridine cooling and recovery device comprises a tank body 1 and a tank cover 101 detachably connected to the tank body 1, wherein an inner cooling plate 2 is arranged at the upper end of the tank body 1, the inner cooling plate 2 is arranged in a cylindrical shape, the inner cooling plate 2 is fixedly connected to the tank cover 101, and a low-temperature water input pipe 201 and a low-temperature water output pipe 202 connected to the inner cooling plate 2 are fixedly installed on the tank cover 101; an air delivery pipe 103 and an exhaust pipe 104 are fixedly connected to the tank cover 101 and are connected to the tank body 1, wherein the air delivery pipe 103 is coaxially arranged with the inner cooling plate 2 arranged in a cylindrical shape; an external cooling jacket 3 is fixedly connected to the outer wall of the lower end of the tank body 1.

[0023] The side wall of the upper end of the outer cooling jacket 3 is fixedly connected with a water outlet pipe 301 , and the lower end of the outer cooling jacket 3 is fixedly connected with a water injection pipe 302 .

[0024] The water outlet pipe 301 and the water injection pipe 302 are both fixedly installed with three-way joints 303. The three-way joints 303 on the water injection pipe 302 are respectively connected to the external cold water pipe and hot water pipe. The three-way joints 303 on the water outlet pipe 301 are respectively connected to the external cold water tank and hot water tank through hoses.

[0025] The bottom of the tank body 1 is fixedly connected with a discharge pipe 105 .

[0026] The discharge pipe 105 , the cold water pipe, the hot water pipe, the hose, the gas pipe 103 , the exhaust pipe 104 , the low-temperature water input pipe 201 , and the low-temperature water output pipe 202 are all provided with valve switches.

[0027] When in use, first open the valve switches on the low-temperature water input pipe 201, the low-temperature water output pipe 202, the cold water pipe, and the hose. At this time, the low-temperature water flows into the inner cooling plate 2 through the low-temperature water input pipe 201, and then flows out through the low-temperature water output pipe 202. At the same time, the low-temperature water flows into the outer cooling jacket 3 through the cold water pipe and the water injection pipe 302 in sequence, and then flows out through the water outlet pipe 301 and the hose, and flows back into the cold water tank. At this time, open the valve switches of the gas pipeline 103 and the exhaust pipe 104, so that after the 2-chloro-6-trichloromethylpyridine gas enters the tank body 1 through the gas pipeline 103, it first passes through the inner cooling plate 2 for cooling, and then the gas is converted from gaseous to solid and collected at the bottom of the tank body 1. The warm water input pipe 201 is arranged at the upper end of the inner cooling plate 2, so that the time of low-temperature water in the inner cooling plate 2 is increased, thereby enhancing the cooling effect on the 2-chloro-6-trichloromethylpyridine gas, and the inner cooling plate 2 is arranged in a cylindrical shape to maximize the cooling contact area, further improving the cooling effect on the 2-chloro-6-trichloromethylpyridine gas, and then the gas is cooled through the outer cooling jacket 3 in the lower half of the tank body 1. Since the water outlet pipe 301 is arranged near the upper end of the outer cooling jacket 3, the time of low-temperature water in the outer cooling jacket 3 is increased, and the water flowing into the outer cooling jacket 3 is in direct contact with the surface of the tank body 1, further improving the cooling effect on the 2-chloro-6-trichloromethylpyridine gas.

[0028] When cooling the 2-chloro-6-trichloromethylpyridine gas, the internal pressure of the tank body 1 is set to ≤0.3Mpa and the temperature is set to ≤40 degrees, and then the recovery is stopped every 12 hours. When the recovery is stopped, the valve switches on the low-temperature water input pipe 201, the low-temperature water output pipe 202, the cold water pipe, the hose, the gas pipe 103, and the exhaust pipe 104 are closed, and then the valve switches on the hot water pipe and the hose are opened. At this time, hot water flows into the external cooling jacket 3 through the hot water pipe, so that the 2-chloro-6-trichloromethylpyridine converted from gas to solid is heated and melted, and then the hot water flowing into the external cooling jacket 3 is discharged through the hose and refluxed into the hot water tank;

[0029] Meanwhile, during the heating process, the water temperature is controlled at 90°C, and the material-making time is set to 15 minutes. When the material-making is completed in 15 minutes, the valve switch on the discharge pipe 105 is opened, so that the 2-chloro-6-trichloromethylpyridine melted into liquid can be discharged into the system through the discharge pipe 105 for reuse, and then the valve switches on the hot water pipe and the hose are closed, and then the valve switches on the low-temperature water input pipe 201, the low-temperature water output pipe 202, the cold water pipe, the hose, the gas pipe 103, and the exhaust pipe 104 can continue to start recycling, thereby improving the recovery rate of the material.

[0030] Embodiment 2:

[0031] Reference Figure 1 , Figure 3 and Figure 4 , 2-chloro-6-trichloromethylpyridine cooling and recovery device, which is basically the same as that of Example 1, and further, the tank cover 101 is detachably connected to the tank body 1 by a plurality of fixing bolts 102;

[0032] The arrangement of multiple fixing bolts 102 facilitates not only the installation of the tank cover 101 but also the disassembly of the tank cover 101. Therefore, when the inside of the tank body 1 needs to be cleaned, the tank body 1 can be opened by removing the tank cover 101, thereby facilitating the cleaning of the inside of the tank body 1.

[0033] Embodiment 3:

[0034] Reference Figure 2 The 2-chloro-6-trichloromethylpyridine cooling and recovery device is basically the same as that in Example 1. Furthermore, a pressure gauge interface 4 and a thermometer interface 401 are provided on the tank body 1.

[0035] The pressure gauge interface 4 is provided so as to be used for installing a pressure gauge, and the pressure gauge is used to detect the pressure inside the tank body 1;

[0036] The thermometer interface 401 is provided so as to be used for installing a thermometer, and the thermometer is used for detecting the temperature inside the tank body 1 .

[0037] Embodiment 4:

[0038] Reference Figure 2 , 2-chloro-6-trichloromethylpyridine cooling and recovery device, which is basically the same as Example 1, further, the low-temperature water input pipe 201 and the low-temperature water output pipe 202 are selected from DN25 carbon steel sprayed with PFA material, and the overall material of the inner cooling plate 2 is selected as carbon steel sprayed with PFA material, the inner diameter of the inner cooling plate 2 is 300mm, the outer diameter is 400mm, and the overall length is 1100mm;

[0039] The overall material of the tank body 1 is selected as carbon steel sprayed with PFA material. The diameter of the tank body 1 is 800mm, the height is 1500mm, the thickness is 6mm, and the volume is 500L. The overall material of the gas pipe 103, the exhaust pipe 104 and the discharge pipe 105 is selected as DN125 carbon steel sprayed with PFA material;

[0040] The overall material of the water injection pipe 301 and the water outlet pipe 302 is DN25 carbon steel;

[0041] The overall material of the pressure gauge interface 4 and the thermometer interface 401 is selected to be DN25 carbon steel sprayed with PFA material;

[0042] In summary, it is ensured that the 2-chloro-6-trichloromethylpyridine gas will not cause corrosion to the contact surface after entering the tank body 1, thereby extending the service life of the 2-chloro-6-trichloromethylpyridine cooling and recovery device.

[0043] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention.

Claims

1. 2-Chloro-6-trichloromethylpyridine cooling and recovery device, characterized in that: It comprises a tank body (1) and a tank cover (101) detachably connected to the tank body (1), An inner cooling plate (2) is provided at the upper end of the tank body (1); the inner cooling plate (2) is cylindrical in shape; the inner cooling plate (2) is fixedly connected to the tank cover (101); and a low-temperature water input pipe (201) and a low-temperature water output pipe (202) which are connected to the inner cooling plate (2) are fixedly mounted on the tank cover (101); The gas delivery pipe (103) and the exhaust pipe (104) are fixedly connected to the tank cover (101) and communicate with the tank body (1). Wherein, the gas delivery pipe (103) is coaxially arranged with the inner cooling plate (2) arranged in a cylindrical shape; The external cooling jacket (3) is fixedly connected to the outer wall of the lower end of the tank body (1).

2. The 2-chloro-6-trichloromethylpyridine cooling and recovery device according to claim 1, characterized in that: The tank cover (101) is detachably connected to the tank body (1) via a plurality of fixing bolts (102).

3. The 2-chloro-6-trichloromethylpyridine cooling and recovery device according to claim 1, characterized in that: The side wall of the upper end of the outer cooling jacket (3) is fixedly connected to a water outlet pipe (301), and the lower end of the outer cooling jacket (3) is fixedly connected to a water injection pipe (302).

4. The 2-chloro-6-trichloromethylpyridine cooling and recovery device according to claim 3, characterized in that: The water outlet pipe (301) and the water injection pipe (302) are both fixedly mounted with three-way joints (303); the three-way joints (303) on the water injection pipe (302) are respectively connected to an external cold water pipe and a hot water pipe; the three-way joints (303) on the water outlet pipe (301) are respectively connected to an external cold water tank and a hot water tank via a hose.

5. The 2-chloro-6-trichloromethylpyridine cooling and recovery device according to claim 4, characterized in that: The bottom of the tank body (1) is fixedly connected to a discharge pipe (105).

6. The 2-chloro-6-trichloromethylpyridine cooling and recovery device according to claim 5, characterized in that: The discharge pipe (105), the cold water pipe, the hot water pipe, the hose, the gas pipe (103), the exhaust pipe (104), the low-temperature water input pipe (201), and the low-temperature water output pipe (202) are all provided with valve switches.

7. The 2-chloro-6-trichloromethylpyridine cooling and recovery device according to claim 1, characterized in that: The tank body (1) is provided with a pressure gauge interface (4) and a thermometer interface (401).

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