Tail gas absorption treatment device for production of methylsulfonylbenzoic acid

Abstract

The utility model relates to a tail gas absorption treatment device for production of methylsulfonylbenzoic acid, which comprises a recovery tank, a tail gas inlet for production of methylsulfonylbenzoic acid is arranged at the bottom of the recovery tank, and a spraying structure is arranged in the top of the recovery tank. A gas-liquid mixture inlet is formed in the bottom face of the recovery tank and communicated with an outlet of a Venturi pipeline, an inlet of the Venturi pipeline is communicated with an outlet of a pressurizing device, an inlet of the pressurizing device is connected with an oxygen inlet pipeline, and a suction inlet of the Venturi pipeline is communicated with a buffer tank through a pipeline. An inlet pipeline of the spraying structure is communicated with an outlet of the lifting pump, an inlet pipeline of the lifting pump is communicated with the buffer tank, an exhaust port is formed in the top of the recycling tank and communicated with the bottom of the recycling tank through a circulating pipeline, and a circulating pump is arranged on the circulating pipeline. The device meets the requirement of nitric acid recovery and improves the recovery rate.

Description

TECHNICAL FIELD

[0001] The utility model relates to methylsulfonyl benzoic acid production equipment technical field, concretely relates to a tail gas absorption treatment device for methylsulfonyl benzoic acid production. BACKGROUND

[0002] Methylsulfonyl benzoic acid, this paper refers to 2-nitro-4-methylsulfonyl benzoic acid, when producing, can 2-nitro-4-methylsulfonyl toluene as raw material, under nitric acid and sulfuric acid system high-temperature pressurized reaction, while water is produced, after the reaction is finished, filter, delamination, drying just get 2-nitro-4-methylsulfonyl benzoic acid. In order to reduce the raw material consumption, the nitric acid in the tail gas for methylsulfonyl benzoic acid production should be recycled.

[0003] CN 222445945 U discloses a hydrochloric acid tail gas absorption treatment device, which comprises a processing mechanism and an adsorption mechanism, the adsorption mechanism is fixedly connected to the surface of the processing mechanism, the adsorption mechanism comprises a filler unit and a circulation unit, the filler unit is fixedly connected to the inside of the processing mechanism, and the circulation unit is fixedly connected to the side surface of the processing mechanism. The device is designed with a specific filler layer and a spraying device, which increases the contact area of the waste gas and the absorption liquid and improves the absorption efficiency. However, there are still the following problems: as for recycling acid liquid, however, in order to recover nitric acid in the tail gas, oxygen is required to participate in the reaction and uniform mixing is required, which cannot be achieved by the device. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a tail gas absorption treatment device for methylsulfonyl benzoic acid production with reasonable structure and reliable use, which solves the above problems, meets the nitric acid recovery demand and improves the recovery rate.

[0005] The technical scheme of the utility model is:

[0006] A tail gas absorption treatment device for methylsulfonyl benzoic acid production, comprising a recovery tank, the bottom of the recovery tank is provided with a methylsulfonyl benzoic acid production tail gas inlet, and a spraying structure is arranged in the top of the recovery tank, and the technical key points are as follows: a buffer tank for storing the produced water of methylsulfonyl benzoic acid production is arranged on the side of the recovery tank, a gas-liquid mixture inlet is arranged on the bottom surface of the recovery tank, the gas-liquid mixture inlet is communicated with the outlet of a venturi pipe, the inlet of the venturi pipe is communicated with the outlet of a pressurizing device, the inlet of the pressurizing device is connected with an oxygen inlet pipe, the suction inlet of the venturi pipe is communicated with the buffer tank through a pipe, the inlet pipe of the spraying structure is communicated with the outlet of a booster pump, the inlet pipe of the booster pump is communicated with the buffer tank, a stirring mechanism is arranged in the lower part of the recovery tank, a plurality of filler layers are arranged in the upper part of the recovery tank, an exhaust port is arranged on the top of the recovery tank, the exhaust port is communicated with the bottom of the recovery tank through a circulation pipe, and a circulation pump is arranged on the circulation pipe.

[0007] The tail gas absorption treatment device for methylsulfonylbenzoic acid production, the filter plate is arranged in the upper portion of the buffer tank, a liquid level meter is arranged in the lower portion, and a heater is arranged at the bottom.

[0008] The tail gas absorption treatment device for methylsulfonylbenzoic acid production, the tail end of the pipeline connected with the suction inlet of the Venturi pipeline is inserted into the lower portion of the buffer tank, and the inlet pipeline of the lifting pump is inserted into the lower portion of the buffer tank.

[0009] The tail gas absorption treatment device for methylsulfonylbenzoic acid production, the top of the recovery tank is provided with a stirring motor, the stirring mechanism is a stirring paddle, and the upper end of the stirring shaft of the stirring paddle is connected and fixed with the output end of the stirring motor after penetrating through each packing layer.

[0010] The tail gas absorption treatment device for methylsulfonylbenzoic acid production, the suction inlet of the Venturi pipeline is provided with a first control valve, the gas-liquid mixture inlet of the recovery tank is provided with a second control valve, the inlet pipeline of the spraying structure is provided with a third control valve, and the methylsulfonylbenzoic acid production tail gas inlet is provided with a fourth control valve.

[0011] The tail gas absorption treatment device for methylsulfonylbenzoic acid production, the exhaust port is further communicated with an emptying pipeline, the inlet of the circulating pipeline is provided with a fifth control valve, the inlet of the emptying pipeline is provided with a sixth control valve, and the tail end of the circulating pipeline is provided with a seventh control valve.

[0012] The tail gas absorption treatment device for methylsulfonylbenzoic acid production has the beneficial effects that:

[0013] 1. The oxygen is mixed with the produced water of the methylsulfonylbenzoic acid production through the Venturi pipeline and is conveyed to the bottom of the recovery tank, is mixed with the tail gas of the methylsulfonylbenzoic acid production, and is driven by the stirring mechanism, so that the mixture is uniformly mixed and the yield is improved.

[0014] 2. The buffer tank is used for storing the produced water of the methylsulfonylbenzoic acid production in the recovery process, so that energy saving and environmental protection are achieved.

[0015] 3. The mixed gas taken out from the exhaust port can flow back to the bottom of the recovery tank through the circulating pipeline under the action of the circulating pump, further participates in the reaction, and the recovery rate is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic view of the utility model.

[0017] In the figure: 1. Buffer tank, 2. Filter plate, 3. Lifting pump, 4. Third control valve, 5. Spray structure, 6. Filler layer, 7. Stirring mechanism, 8. Oxygen inlet pipeline, 9. Pressurizing device, 10. Venturi pipeline, 11. Stirring motor, 12. Exhaust port, 13. Sixth control valve, 14. Emptying pipeline, 15. Fifth control valve, 16. Circulation pipeline, 17. Circulation pump, 18. Seventh control valve, 19. Methanesulfonylbenzoic acid production tail gas inlet, 20. Fourth control valve, 21. Gas-liquid mixture inlet, 22. Second control valve, 23. First control valve, 24. Pipeline, 25. Inlet pipeline, 26. Heater, 27. Liquid level meter, 28. Recovery tank. DETAILED DESCRIPTION

[0018] The utility model will be described in detail according to the drawing of the specification.

[0019] As Figure 1 Indicated, this methanesulfonylbenzoic acid production tail gas absorption treatment device, including recovery tank 28, recovery tank 28 bottom is equipped with methanesulfonylbenzoic acid production tail gas inlet 19, and recovery tank 28 top is built-in spray structure 5.

[0020] Wherein, the recovery tank 28 side is equipped with the buffer tank 1 for storing the methanesulfonylbenzoic acid production produced water, in the embodiment, the buffer tank 1 upper portion is built-in filter plate 2, and the lower portion is equipped with liquid level meter 27, and the bottom is equipped with heater 26.

[0021] The bottom surface of the recovery tank 28 is provided with a gas-liquid mixture inlet 21, and the gas-liquid mixture inlet 21 is communicated with the outlet of the venturi pipeline 10, the inlet of the venturi pipeline 10 is communicated with the outlet of the pressurizing device 9, the inlet of the pressurizing device 9 is connected with the oxygen inlet pipeline 8, and the suction inlet of the venturi pipeline 10 is communicated with the buffer tank 1 by the pipeline 24. The inlet pipeline of the spray structure 5 is communicated with the outlet of the lifting pump 3, and the inlet pipeline 25 of the lifting pump 3 is communicated with the buffer tank 1.

[0022] The recovery tank 28 is built-in with a stirring mechanism 7 in the lower part and a plurality of filler layers 6 in the upper part. In the embodiment, the recovery tank 28 is provided with a stirring motor 11 at the top, the stirring mechanism 7 is a stirring paddle, and the stirring shaft of the stirring paddle is connected and fixed with the output end of the stirring motor 11 after penetrating through each filler layer 6. The top of the recovery tank 28 is provided with an exhaust port 12, the exhaust port 12 is communicated with the bottom of the recovery tank 28 by a circulation pipeline 16, and the circulation pipeline 16 is provided with a circulation pump 17.

[0023] The pipe 24 connected with the suction port of the venturi pipe 10 is inserted into the lower part of the buffer tank 1, and the inlet pipe 25 of the lifting pump 3 is inserted into the lower part of the buffer tank 1. The suction port of the venturi pipe 10 is provided with a first control valve 23, the gas-liquid mixture inlet 21 of the recovery tank 28 is provided with a second control valve 22, the inlet pipe of the spraying structure 5 is provided with a third control valve 4, and the methanesulfonophenyl benzoic acid production tail gas inlet 19 is provided with a fourth control valve 20. The exhaust port 12 is further communicated with the emptying pipeline 14, the inlet of the circulating pipeline 16 is provided with a fifth control valve 15, the inlet of the emptying pipeline 14 is provided with a sixth control valve 13, and the end of the circulating pipeline 16 is provided with a seventh control valve 18.

[0024] Working principle:

[0025] The heater 26 is used to increase the water temperature in the buffer tank 1 to 45 DEG C. The produced water of the methanesulfonophenyl benzoic acid production is first extracted by the lifting pump 3 and sent to the spraying structure 5, and then the produced water is sprayed in the recovery tank 28 through the spraying structure 5 and accumulated at the bottom of the recovery tank 28 to a certain height. The production tail gas is introduced into the bottom of the recovery tank 28 through the methanesulfonophenyl benzoic acid production tail gas inlet 19, and at the same time, the oxygen is mixed with the produced water of the methanesulfonophenyl benzoic acid production and transmitted to the bottom of the recovery tank 28 through the venturi pipe 10, and is uniformly mixed with the production tail gas of the methanesulfonophenyl benzoic acid production under the driving of the stirring mechanism 7, which is beneficial to improve the yield of nitric acid. The produced water sprayed by the spraying structure 5 is contacted with the gaseous substances rising from the lower part of the recovery tank 28 at the filler layer 6, so that the rising gaseous substances are captured. At the same time, the mixed gas taken out from the exhaust port 12 can be returned to the bottom of the recovery tank 28 through the circulating pipeline 16 under the action of the circulating pump 17, so as to further participate in the reaction and further improve the recovery rate. After the reaction is completed, the cooling is performed to realize the recovery of the nitric acid, and the content of the nitric acid in the water is about 40%.

[0026] The above embodiment of the utility model is described in detail, but the content is only the preferred embodiment of the utility model, and cannot be considered as limiting the scope of the utility model. Any equivalent change and improvement within the scope of the utility model is still within the scope of the patent.

Claims

1. A tail gas absorption treatment device for methanesulfonylbenzoic acid production, comprising a recovery tank, the bottom of the recovery tank is provided with a methanesulfonylbenzoic acid production tail gas inlet, and a spraying structure is arranged in the top of the recovery tank, characterized in that: The recovery tank is provided with a buffer tank on the side for storing the produced effluent of methylsulfonylbenzoic acid, the bottom of the recovery tank is provided with a gas-liquid mixture inlet, the gas-liquid mixture inlet is communicated with the outlet of a venturi pipeline, the inlet of the venturi pipeline is communicated with the outlet of a pressurizing device, the inlet of the pressurizing device is connected with an oxygen inlet pipeline, the suction inlet of the venturi pipeline is communicated with the buffer tank by a pipeline, the inlet pipeline of the spraying structure is communicated with the outlet of a lifting pump, the inlet pipeline of the lifting pump is communicated with the buffer tank, the lower part of the recovery tank is provided with a stirring mechanism, the upper part of the recovery tank is provided with a plurality of filler layers, the top of the recovery tank is provided with an exhaust port, the exhaust port is communicated with the bottom of the recovery tank by a circulating pipeline, and the circulating pipeline is provided with a circulating pump.

2. The tail gas absorption treatment device for methiasyl benzoic acid production according to claim 1, characterized by: The buffer tank is provided with a filter plate in the upper part, a liquid level meter in the lower part, and a heater in the bottom.

3. The tail gas absorption treatment device for methiasyl benzoic acid production according to claim 1, characterized by: The pipeline connected with the suction inlet of the venturi pipeline is inserted into the lower part of the buffer tank, and the inlet pipeline of the lifting pump is inserted into the lower part of the buffer tank.

4. The tail gas absorption treatment device for methiasyl benzoic acid production according to claim 1, characterized by: The top of the recovery tank is provided with a stirring motor, the stirring mechanism is a stirring paddle, and the stirring shaft of the stirring paddle is connected and fixed with the output end of the stirring motor after penetrating through each filler layer.

5. The tail gas absorption treatment device for methiasyl benzoic acid production according to claim 1, characterized by: The suction inlet of the venturi pipeline is provided with a first control valve, the gas-liquid mixture inlet of the recovery tank is provided with a second control valve, the inlet pipeline of the spraying structure is provided with a third control valve, and the fourth control valve is arranged at the tail gas inlet of the methylsulfonylbenzoic acid production.

6. The tail gas absorption treatment device for methiasyl benzoic acid production according to claim 1, characterized by: The exhaust port is also communicated with an emptying pipeline, the inlet of the circulating pipeline is provided with a fifth control valve, the inlet of the emptying pipeline is provided with a sixth control valve, and the end of the circulating pipeline is provided with a seventh control valve.

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