Reaction tower tail gas treatment device for N-methyltriazine production

Abstract

The utility model discloses a reaction tower tail gas treatment device for producing N-methyltriazine, which relates to the field of tail gas treatment and comprises an air pump, the input end of the air pump is connected with a second connecting pipe, the output end of the air pump is connected with a first connecting pipe, and the output end of the first connecting pipe is connected with a tail gas box. The tail gas box is communicated with an inner cavity of the first connecting pipe, a reciprocating rotating mechanism extending to one side of the tail gas box is installed at the top of the tail gas box, a spraying mechanism is rotatably installed in the tail gas box, and the spraying mechanism is connected with the reciprocating rotating mechanism; the spraying mechanism comprises a spraying pipe rotationally connected to the inner wall of the tail gas box, and a plurality of nozzles are axially installed below the spraying pipe. Through the arrangement of the reciprocating rotating mechanism and the rotatable spraying pipe, the spraying range can be enlarged, the full contact of a sodium hydroxide aqueous solution and chlorine is improved, and the treatment efficiency of chlorine in tail gas is further improved.

Description

Technical Field

[0001] The utility model relates to the field of tail gas treatment, in particular to a tail gas treatment device for a reaction tower used in the production of N-methyltriazine. Background Technique

[0002] In the production of N-methyltriazine, first, chlorine gas reacts with acetonitrile under the catalysis of hydrogen chloride to form trichloroacetonitrile. Trichloroacetonitrile polymerizes with acetonitrile under the catalysis of aluminum trichloride to form BTCT. Then, BTCT undergoes sodium methoxide alkylation and monomethylamine N-alkylation in methanol to obtain crude triazine. Finally, it is refined by acid and alkali to form methyltriazine. The residual chlorine gas after production needs to be treated.

[0003] The alkali solution neutralization method uses an alkali solution as an absorbent to absorb chlorine gas (Cl₂). This method is the main method for treating chlorine-containing waste gas in China at present. Commonly used absorbents include NaOH solution. During the absorption process, the alkaline absorbent can effectively convert the chlorine in the waste gas into a by-product, chlorate, after the reaction technology.

[0004] In the prior art, when spraying sodium hydroxide solution, due to the limitation of the spraying angle, there will be a problem that the contact between chlorine gas and the sprayed sodium hydroxide aqueous solution is insufficient. Therefore, it takes a relatively long reaction time to achieve the full reaction between chlorine gas and the sodium hydroxide aqueous solution, and the sprayed sodium hydroxide aqueous solution will be relatively more. Content of the Utility Model

[0005] The purpose of the utility model is to provide a tail gas treatment device for a reaction tower used in the production of N-methyltriazine to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A tail gas treatment device for a reaction tower used in the production of N-methyltriazine, including an air pump. The input end of the air pump is connected to a second connecting pipe, the output end of the air pump is connected to a first connecting pipe, the output end of the first connecting pipe is connected to a tail gas tank, the tail gas tank is communicated with the inner cavity of the first connecting pipe, a reciprocating rotation mechanism extending to one side of the tail gas tank is installed on the top of the tail gas tank, a spraying mechanism is rotatably installed inside the tail gas tank, and the spraying mechanism is connected to the reciprocating rotation mechanism;

[0007] The spraying mechanism includes a spraying pipe rotatably connected to the inner wall of the tail gas tank. A plurality of nozzles are axially installed below the spraying pipe. The input end of the spraying pipe is rotatably connected to a fixed pipe, and a sealing ring is arranged at the rotational connection of the spraying pipe and the fixed pipe.

[0008] As a further solution of the present utility model: The reciprocating rotation mechanism includes a rotating motor installed at the top end of the tail gas tank. The output shaft of the rotating motor is fixedly connected with a rotating disk through a coupling. An eccentric shaft protruding outward is integrally formed at an eccentric position of the rotating disk.

[0009] As a further solution of the present utility model: The reciprocating rotation mechanism further includes a guide rail fixedly connected to one side of the outer wall of the tail gas tank. A slider is slidably connected up and down on the inner wall of the guide rail. One end of the slider is fixedly connected with a rack. A cross plate is integrally formed at the top of the rack. A sliding groove for movably connecting with the eccentric shaft is opened inside the cross plate.

[0010] As a further solution of the present utility model: The reciprocating rotation mechanism further includes a gear fixedly connected to the other end of the spray pipe. The gear meshes with the rack.

[0011] As a further solution of the present utility model: A fixing frame is fixedly connected to the outer wall of the fixed pipe. The fixing frame and the outer wall of the tail gas tank are fixedly connected through a fixing rod.

[0012] As a further solution of the present utility model: Guide inclined surfaces are integrally formed on both sides of the lower part of the inner wall of the tail gas tank. A discharge pipe extending downward is installed between the two guide inclined surfaces at the bottom end of the tail gas tank. The discharge pipe is communicated with the inner cavity of the tail gas tank.

[0013] Compared with the prior art, the beneficial effects of the present utility model are:

[0014] 1. By arranging the reciprocating rotation mechanism and the rotatable spray pipe, the spraying range can be increased, the full contact between the sodium hydroxide aqueous solution and chlorine gas can be improved, and further the treatment efficiency of chlorine gas in the tail gas can be enhanced. Description of the Drawings

[0015] Figure 1 is a structural schematic diagram of the present utility model;

[0016] Figure 2 is the Figure 1 local enlarged view at A of the present utility model;

[0017] Figure 3 is an internal structural schematic diagram of the tail gas tank of the present utility model;

[0018] Figure 4 is the Figure 3 local enlarged view at B of the present utility model.

[0019] In the figure: 1, tail gas tank; 2, first connecting pipe; 3, air pump; 4, second connecting pipe; 5, discharge pipe; 6, rotating motor; 7, rotating disc; 8, eccentric shaft; 9, cross plate; 10, sliding groove; 11, rack; 12, gear; 13, guide rail; 14, slider; 15, fixed pipe; 16, spray pipe; 17, nozzle; 18, guiding inclined plane; 19, fixing bracket; 20, fixing rod. Specific implementation manner

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0021] Please refer to Figures 1 to 4 , in the embodiment of the present invention, a tail gas treatment device for a reaction tower used in the production of N-methyltriazine includes an air pump 3. The input end of the air pump 3 is connected to a second connecting pipe 4, the output end of the air pump 3 is connected to a first connecting pipe 2, the output end of the first connecting pipe 2 is connected to a tail gas tank 1. The inner cavity of the tail gas tank 1 is communicated with the first connecting pipe 2. A reciprocating rotating mechanism extending to one side of the tail gas tank 1 is installed on the top of the tail gas tank 1. A spraying mechanism is rotatably installed inside the tail gas tank 1. The spraying mechanism is connected to the reciprocating rotating mechanism; the spraying mechanism includes a spray pipe 16 rotatably connected to the inner wall of the tail gas tank 1. A plurality of nozzles 17 are axially installed below the spray pipe 16. The input end of the spray pipe 16 is rotatably connected to a fixed pipe 15. A sealing ring is provided at the rotating connection of the spray pipe 16 and the fixed pipe 15.

[0022] In this embodiment: After the N-methyltriazine reaction is completed, the second connecting pipe 4 is connected to the tail gas pipe on the reaction kettle, and the air pump 3 is started to suck out the tail gas (mainly chlorine gas) in the reaction kettle, and through the second connecting pipe 4 and the first connecting pipe 2, the remaining chlorine gas in the reaction is sucked into the tail gas tank 1. Then, the water pump connected to the spraying device is started. The water pump inputs the sodium hydroxide aqueous solution into the spraying mechanism. The sodium hydroxide solution sprayed by the spraying mechanism reacts with the chlorine gas in the tail gas, so as to absorb the chlorine gas in the tail gas. At the same time, the reciprocating rotating mechanism is started to reciprocally drive the spray pipe 16 of the spraying mechanism to rotate reciprocally. The reciprocally rotating spray pipe 16 drives the nozzles 17 to rotate reciprocally synchronously, so as to increase the spraying range of the nozzles 17 and realize the contact reaction between the sodium hydroxide aqueous solution and the chlorine gas as fully as possible.

[0023] Please pay special attention to Figure 1 , Figure 2 and Figure 3, the reciprocating rotating mechanism includes a rotating motor 6 installed at the top of the tail gas tank 1. The output shaft of the rotating motor 6 is fixedly connected with a rotating disk 7 through a coupling. An eccentric shaft 8 protruding outward is integrally formed at the eccentric position of the rotating disk 7. The reciprocating rotating mechanism further includes a guide rail 13 fixedly connected to one side of the outer wall of the tail gas tank 1. A slider 14 is slidably connected up and down on the inner wall of the guide rail 13. One end of the slider 14 is fixedly connected with a rack 11. A cross plate 9 is integrally formed at the top of the rack 11. A sliding groove 10 for movably connecting with the eccentric shaft 8 is formed inside the cross plate 9. The reciprocating rotating mechanism further includes a gear 12 fixedly connected to the other end of the spray pipe 16. The gear 12 meshes with the rack 11.

[0024] In this embodiment: By starting the rotating motor 6, the rotating motor 6 operates to drive the rotating disk 7 at its output end to rotate. Rotating the rotating disk 7 drives the eccentric shaft 8 to rotate synchronously. Rotating the eccentric shaft 8 acts in the sliding groove 10 and squeezes the sliding groove 10. At this time, the cross plate 9 reciprocates in the up and down direction. The cross plate 9 can drive the rack 11 to move up and down reciprocally. The rack 11 drives the slider 14 to move up and down along the inner wall of the guide rail 13. At the same time, the rack 11 drives the gear 12 to rotate reciprocally. Reciprocally rotating the gear 12 can drive the spray pipe 16 to perform a reciprocating cycle.

[0025] Please refer specifically to Figure 4 , a fixing frame 19 is fixedly connected to the outer wall of the fixed pipe 15. The fixing frame 19 and the outer wall of the tail gas tank 1 are fixedly connected through a fixing rod 20.

[0026] In this embodiment: During the reciprocating rotation of the spray pipe 16, the fixed pipe 15 always remains stationary, thereby realizing the relative rotation between the spray pipe 16 and the fixed pipe 15.

[0027] Please refer specifically to Figure 3 , guiding inclined surfaces 18 are integrally formed on both sides of the lower part of the inner wall of the tail gas tank 1. A discharge pipe 5 extending downward is installed between the two guiding inclined surfaces 18 at the bottom end of the tail gas tank 1. The discharge pipe 5 is communicated with the inner cavity of the tail gas tank 1.

[0028] In this embodiment: During the reaction process, the chlorate generated by the reaction is discharged through the discharge pipe 5.

[0029] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A tail gas treatment device for a reaction tower used in the production of N-methyltriazine, comprising an air pump (3), the input end of the air pump (3) is connected with a second connecting pipe (4), and the output end of the air pump (3) is connected with a first connecting pipe (2), characterized in that, The output end of the first connecting pipe (2) is connected to an exhaust gas tank (1). The exhaust gas tank (1) is communicated with the inner cavity of the first connecting pipe (2). A reciprocating rotation mechanism extending to one side of the exhaust gas tank (1) is installed at the top of the exhaust gas tank (1). A spraying mechanism is rotatably installed inside the exhaust gas tank (1). The spraying mechanism is connected to the reciprocating rotation mechanism. The spraying mechanism includes a spraying pipe (16) rotatably connected to the inner wall of the exhaust gas tank (1). A plurality of nozzles (17) are axially installed below the spraying pipe (16). The input end of the spraying pipe (16) is rotatably connected to a fixed pipe (15). A sealing ring is provided at the rotational connection between the spraying pipe (16) and the fixed pipe (15).

2. The tail gas treatment device for the reaction tower used in the production of N-methyltriazine according to claim 1, wherein, The reciprocating rotation mechanism includes a rotary motor (6) installed at the top end of the exhaust gas tank (1). The output shaft of the rotary motor (6) is fixedly connected to a rotating disk (7) through a coupling. An eccentric shaft (8) protruding outward is integrally formed at an eccentric position of the rotating disk (7).

3. The tail gas treatment device for the reaction tower used in the production of N-methyltriazine according to claim 2, characterized in that, The reciprocating rotation mechanism further includes a guide rail (13) fixedly connected to one side of the outer wall of the exhaust gas tank (1). A slider (14) is slidably connected up and down to the inner wall of the guide rail (13). One end of the slider (14) is fixedly connected to a rack (11). A cross plate (9) is integrally formed at the top of the rack (11). A sliding groove (10) for movably connecting with the eccentric shaft (8) is formed inside the cross plate (9).

4. The tail gas treatment device for the reaction tower used in the production of N-methyltriazine according to claim 3, wherein, The reciprocating rotation mechanism further includes a gear (12) fixedly connected to the other end of the spraying pipe (16). The gear (12) meshes with the rack (11).

5. The tail gas treatment device for the reaction tower used in the production of N-methyltriazine according to claim 4, characterized in that, A fixing frame (19) is fixedly connected to the outer wall of the fixed pipe (15). The fixing frame (19) and the outer wall of the exhaust gas tank (1) are fixedly connected through a fixing rod (20).

6. The tail gas treatment device for the reaction tower used in the production of N-methyltriazine according to claim 5, characterized in that, Guide slopes (18) are integrally formed on both sides of the lower part of the inner wall of the exhaust gas tank (1). A discharge pipe (5) extending downward is installed between the two guide slopes (18) at the bottom end of the exhaust gas tank (1). The discharge pipe (5) is communicated with the inner cavity of the exhaust gas tank (1).

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