Device for trapping tail gas material of chlorination kettle

Abstract

The utility model discloses a device for trapping tail gas materials of a chlorination kettle, and relates to the field of fine chemical engineering. A device for trapping tail gas materials of a chlorination kettle comprises a chlorination kettle body, a first-stage condenser, a second-stage condenser and a trapping tank, and the chlorination kettle body is communicated with the first-stage condenser through a tail gas pipe; one end of the solvent return pipe is fixedly communicated with the chlorination kettle body, and the other end of the solvent return pipe is fixedly communicated with the primary condenser; according to the utility model, materials carried in chlorination reaction tail gas can be intercepted, and the intercepted materials are returned to the chlorination kettle body for recycling, so that the raw material loss is reduced, the production cost is saved, the whole operation process can be fully automatic, and the production efficiency is improved while the manual operation is effectively reduced. The stability and safety of equipment operation are improved, and the reaction temperature of the chlorination kettle body is controlled, so that the reaction temperature of the chlorination kettle body can be optimal.

Description

Technical Field

[0001] The utility model belongs to the technical field of fine chemical industry, and specifically relates to a device for capturing the tail gas materials of a chlorination kettle. Background Art

[0002] 2-chloro-6-trichloromethylpyridine (abbreviated as CTC) is prepared by using 2-methylpyridine as a raw material and reacting with chlorine in the presence of a catalyst. However, the acidic tail gas generated by the chlorination reaction contains a large amount of CTC materials, and the CTC materials are prone to crystallization at room temperature, causing pipeline blockage. After blockage, it is easy to cause overpressure in the chlorination reaction kettle, and the system cannot operate normally. In view of this, a device for capturing the tail gas materials of a chlorination kettle is specifically proposed to intercept the materials in the chlorination tail gas and then return them to the chlorination reaction kettle for recycling, reducing the unit consumption of raw materials, reducing the occurrence of production abnormalities, stabilizing the system operation, and saving production costs. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a device for capturing the tail gas materials of a chlorination kettle that can overcome or at least partially solve the above problems.

[0004] To solve the above technical problem, the basic concept of the technical solution adopted by the utility model is:

[0005] A device for capturing the tail gas materials of a chlorination kettle includes a chlorination kettle body, a primary condenser, a secondary condenser, and a capture tank. Among them, the chlorination kettle body is connected to the primary condenser through a tail gas pipe; it also includes a solvent reflux pipe, one end of which is fixedly connected to the chlorination kettle body, and the other end is fixedly connected to the primary condenser; an interconnection pipe, one end of which is fixedly connected to the primary condenser, and the other end is fixedly connected to the secondary condenser; an inlet pipe, one end of which is fixedly connected to the secondary condenser, and the other end is fixedly connected to the capture tank; a first spray pipe, fixedly connected to the primary condenser and used for spraying solvent into the primary condenser; a second spray pipe, fixedly connected to the secondary condenser and used for spraying solvent into the secondary condenser; a cooling jacket, fixedly connected to the outer wall of the capture tank.

[0006] Preferably, an input pipe and an output pipe are fixedly connected to the cooling jacket, and control valves are arranged on the input pipe and the output pipe.

[0007] Preferably, it further includes a solvent circulation tank and a liquid extraction pump. The input end of the liquid extraction pump is fixedly connected to the solvent circulation tank. The second spray pipe is fixedly connected to the first spray pipe, and the first spray pipe is fixedly connected to the output end of the liquid extraction pump. A heating jacket is fixedly connected to the outer wall of the solvent circulation tank.

[0008] In order to be able to control the spraying amount of the solvent, further, regulating valves are provided on both the second spraying pipe and the first spraying pipe.

[0009] In order to heat the solvent stored in the solvent circulation tank, still further, an infusion pipe and a liquid outlet pipe are fixedly communicated with the heating jacket, and electromagnetic valves are provided on the infusion pipe and the liquid outlet pipe.

[0010] In order for the solvent sprayed into the secondary condenser to flow back into the solvent circulation tank, still further, a first reflux pipe is further included. One end of the first reflux pipe is fixedly communicated with the secondary condenser, and the other end is fixedly communicated with the solvent circulation tank.

[0011] Still further, a second reflux pipe is further included. One end of the second reflux pipe is fixedly communicated with the capture tank, and the other end is fixedly communicated with the solvent circulation tank. A valve switch is provided on the second reflux pipe, and a capture pipe is fixedly communicated with the capture tank.

[0012] After adopting the above technical solution, the present utility model has the following beneficial effects compared with the prior art:

[0013] The present utility model can intercept the materials carried in the tail gas of the chlorination reaction and return the intercepted materials to the chlorination kettle body for reuse, thereby reducing raw material loss, saving production costs, and the overall operation process can be fully automated, effectively reducing manual operation while also increasing the stability and safety of the operation of the device. And by controlling the reaction temperature of the chlorination kettle body, the chlorination kettle body can reach the optimal reaction temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural view of the present utility model Figure 1 ;

[0015] Figure 2 is a schematic structural view of the present utility model Figure 2 ;

[0016] Figure 3 is a schematic structural view of the present utility model Figure 3 .

[0017] In the figure: 1. Chlorination kettle body; 2. Solvent reflux pipe; 3. Tail gas pipe; 4. Primary condenser; 401. Interconnection pipe; 5. Secondary condenser; 6. First spray pipe; 601. Control valve; 7. Second spray pipe; 8. First reflux pipe; 9. Solvent circulation tank; 901. Liquid infusion pipe; 902. Liquid outlet pipe; 903. Solenoid valve; 904. Heating jacket; 10. Liquid extraction pump; 11. Second reflux pipe; 1101. Valve switch; 12. Intake pipe; 13. Trapping pipe; 14. Trapping tank; 1401. Input pipe; 1402. Output pipe; 1403. Control valve; 1404. Cooling jacket; 15. Vent pipe. Detailed implementation mode

[0018] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments with reference to the accompanying drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model but are not intended to limit the scope of the present utility model.

[0019] Embodiment 1:

[0020] Refer to Figure 1 , Figure 2 , Figure 3 , a device for trapping the tail gas materials of a chlorination kettle, including a chlorination kettle body 1, a primary condenser 4, a secondary condenser 5, and a trapping tank 14. Among them, the chlorination kettle body 1 is connected to the primary condenser 4 through a tail gas pipe 3; it also includes a solvent reflux pipe 2, one end of which is fixedly connected to the chlorination kettle body 1, and the other end is fixedly connected to the primary condenser 4; an interconnection pipe 401, one end of which is fixedly connected to the primary condenser 4, and the other end is fixedly connected to the secondary condenser 5; an intake pipe 12, one end of which is fixedly connected to the secondary condenser 5, and the other end is fixedly connected to the trapping tank 14; a first spray pipe 6, fixedly connected to the primary condenser 4 and used for spraying solvent into the primary condenser 4; a second spray pipe 7, fixedly connected to the secondary condenser 5 and used for spraying solvent into the secondary condenser 5; a cooling jacket 1404, fixedly connected to the outer wall of the trapping tank 14.

[0021] It also includes a solvent circulation tank 9 and a liquid extraction pump 10. The input end of the liquid extraction pump 10 is fixedly connected to the solvent circulation tank 9. The second spray pipe 7 is fixedly connected to the first spray pipe 6, and the first spray pipe 6 is fixedly connected to the output end of the liquid extraction pump 10. A heating jacket 904 is fixedly connected to the outer wall of the solvent circulation tank 9.

[0022] A liquid infusion pipe 901 and a liquid outlet pipe 902 are fixedly connected to the heating jacket 904, and solenoid valves 903 are arranged on the liquid infusion pipe 901 and the liquid outlet pipe 902.

[0023] It also includes a first reflux pipe 8, one end of which is fixedly connected to the secondary condenser 5, and the other end is fixedly connected to the solvent circulation tank 9.

[0024] An input pipe 1401 and an output pipe 1402 are fixedly connected and communicated to a cooling jacket 1404, and control valves 1403 are arranged on the input pipe 1401 and the output pipe 1402.

[0025] It further includes a second reflux pipe 11. One end of the second reflux pipe 11 is fixedly connected and communicated with a capture tank 14, and the other end is fixedly connected and communicated with a solvent circulation tank 9. A valve switch 1101 is arranged on the second reflux pipe 11, and a capture pipe 13 is fixedly connected and communicated with the capture tank 14.

[0026] Regulating valves 601 are arranged on both the second spray pipe 7 and the first spray pipe 6.

[0027] During use, first, tail gas and chlorine gas are sequentially added into the chlorination kettle body 1 through an injection pipe fixedly connected to the upper end of the chlorination kettle body 1 for reaction. During the reaction process, the amount of chlorine gas is excessive, the material sublimes, and a large amount of 2-chloro-6-trichloromethylpyridine is contained in the tail gas. At this time, the tail gas carrying 2-chloro-6-trichloromethylpyridine enters the first-stage condenser 4 through the tail gas pipe 3. Then, the solvent stored in the solvent circulation tank 9 is transported into the first-stage condenser 4 and the second-stage condenser 5 by a liquid extraction pump 10 through the first spray pipe 6 and the second spray pipe 7. At this time, after the tail gas passing through the first-stage condenser 4 is sprayed with the solvent, the condensate flows back to the chlorination kettle body 1 through the solvent reflux pipe 2. Then, the tail gas enters the second-stage condenser 5 through the interconnection pipe 401 for solvent spraying again, and the condensate flows back to the solvent circulation tank 9 through the first reflux pipe 8. At the same time, when spraying the solvent into the first-stage condenser 4 and the second-stage condenser 5, a Roots blower is externally connected through a connecting pipe fixedly connected to the upper end of the first-stage condenser 4 and the second-stage condenser 5 to blow cold air into the first-stage condenser 4 and the second-stage condenser 5 for cooling;

[0028] Meanwhile, the solvent spraying amount is controlled by the regulating valve 601, and the solvent spraying amount is adjusted according to the temperature of the chlorination kettle body 1 and the salt formation condition of the condenser. For example, the higher the solvent spraying amount, the lower the temperature of the chlorination kettle body 1, so as to control the temperature inside the chlorination kettle body 1, thereby maintaining the optimal reaction temperature. Then, after the tail gas enters the capture tank 14 through the intake pipe 12 for capture, the tail gas is then absorbed;

[0029] Meanwhile, chilled brine is passed through the cooling jacket 1404 of the capture tank 14 via the input pipe 1401 to cool and condense the tail gas. It should be noted that the amount of chilled brine passed through the cooling jacket 1404 can be controlled by the control valve 1403. For example, the more chilled brine is passed through the cooling jacket 1404, the lower the temperature of the capture tank 14, thereby achieving the control of the condensation temperature of the capture tank 14. At this time, the condensed material in the capture tank 14 flows back into the solvent circulation tank 9 through the second reflux pipe 11, so that it can be transported to the chlorination kettle body 1 again for chlorination reaction. At the same time, hot water can also be passed through the heating jacket 904 of the solvent circulation tank 9 via the infusion pipe 901 for heat preservation. It should be noted that the amount of hot water passed through the heating jacket 904 can be controlled by the solenoid valve 903. For example, the more hot water is passed through the heating jacket 904, the higher the temperature of the solvent circulation tank 9, thereby achieving the control of the temperature of the solvent circulation tank 9. Then, the tail gas in the solvent circulation tank 9 is transported into the capture tank 14 through the vent pipe 15 for secondary capture.

[0030] When it is necessary to discharge the chilled brine passed through the cooling jacket 1404, by opening the control valve 1403 on the output pipe 1402, the chilled brine can be discharged from the cooling jacket 1404;

[0031] When it is necessary to discharge the hot water passed through the heating jacket 904, by opening the solenoid valve 903 on the liquid outlet pipe 902, the hot water can be discharged from the heating jacket 904.

[0032] It should be noted that when the tail gas passes through the primary condenser 4, the secondary condenser 5 and enters the capture tank 14, since 2-chloro-6-trichloromethylpyridine is a solid at room temperature and the solvent is miscible with 2-chloro-6-trichloromethylpyridine, the tail gas is cooled by passing chilled brine through the cooling jacket 1404 of the capture tank 14. Then, the condensate is regularly transported to the solvent circulation tank 9 and then transported to the chlorination kettle body 1 for re-chlorination.

[0033] It should be further noted that baffles are provided inside the capture tank 14, which increases the effect of buffer capture;

[0034] Check valves are provided on the solvent reflux pipe 2, the tail gas pipe 3, the interconnection pipe 401, the first spray pipe 6, the second spray pipe 7, the first reflux pipe 8, the infusion pipe 901, the liquid outlet pipe 902, the second reflux pipe 11, the intake pipe 12, the input pipe 1401, the output pipe 1402, and the vent pipe 15.

[0035] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention.

Claims

1. A device for capturing tail gas from a chlorination reactor, characterized in that: It comprises a chlorination kettle body (1), a primary condenser (4), a secondary condenser (5), and a capture tank (14). The chlorination kettle body (1) is connected to the primary condenser (4) via a tail gas pipe (3); It also includes a solvent reflux pipe (2), one end of which is fixedly connected to the chlorination kettle body (1), and the other end of which is fixedly connected to the primary condenser (4); An interconnecting pipe (401), one end of which is fixedly connected to the primary condenser (4), and the other end of which is fixedly connected to the secondary condenser (5); An air inlet pipe (12), one end of which is fixedly connected to the secondary condenser (5), and the other end of which is fixedly connected to the capture tank (14); A spray pipe (6) is fixedly connected to the primary condenser (4) and is used to spray the solvent into the primary condenser (4); A second spray pipe (7) is fixedly connected to the secondary condenser (5) and is used to spray the solvent into the secondary condenser (5); The cooling jacket (1404) is fixedly connected to the outer wall of the capture tank (14).

2. A device for capturing tail gas from a chlorination reactor according to claim 1, characterized in that: The cooling jacket (1404) is fixedly connected with an input pipe (1401) and an output pipe (1402), and control valves (1403) are provided on the input pipe (1401) and the output pipe (1402).

3. A device for capturing tail gas from a chlorination reactor according to claim 1, characterized in that: It also includes a solvent circulation tank (9) and a liquid extraction pump (10), wherein the input end of the liquid extraction pump (10) is fixedly connected to the solvent circulation tank (9), the second spray pipe (7) is fixedly connected to the first spray pipe (6), the first spray pipe (6) is fixedly connected to the output end of the liquid extraction pump (10), and a heating jacket (904) is fixedly connected to the outer wall of the solvent circulation tank (9).

4. A device for capturing tail gas from a chlorination reactor according to claim 3, characterized in that: The spray pipe 2 (7) and the spray pipe 1 (6) are both provided with regulating valves (601).

5. A device for capturing tail gas from a chlorination reactor according to claim 3, characterized in that: The heating jacket (904) is fixedly connected to a liquid infusion tube (901) and a liquid outlet tube (902), and the liquid infusion tube (901) and the liquid outlet tube (902) are provided with a solenoid valve (903).

6. A device for capturing tail gas from a chlorination reactor according to claim 3, characterized in that: It also includes a reflux pipe (8), one end of which is fixedly connected to the secondary condenser (5) and the other end of which is fixedly connected to the solvent circulation tank (9).

7. A device for capturing tail gas from a chlorination reactor according to claim 6, characterized in that: It also includes a second reflux pipe (11), one end of which is fixedly connected to the capture tank (14), and the other end of which is fixedly connected to the solvent circulation tank (9). A valve switch (1101) is provided on the second reflux pipe (11), and the capture tank (14) is fixedly connected to the capture pipe (13).

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