Dichlorosulfimide production tail gas treatment system

Abstract

The utility model discloses a bis (chlorosulfonyl) imide production tail gas treatment system, which belongs to the technical field of chemical equipment, and comprises a buffer tank, a falling film absorber, a packed tower and a drying tower, tail gas enters the buffer tank to recover carried feed liquid, and hydrogen chloride is circularly absorbed in the falling film absorber through a circulating tank; tail gas discharged by the falling film absorber enters a packed tower to further recover hydrogen chloride, and hydrochloric acid discharged by the falling film absorber and the packed tower enters a hydrochloric acid tank; gas discharged from the packed tower enters a drying tower, concentrated sulfuric acid in the drying tower is used for drying water-containing sulfur dioxide in the tail gas, and the dried sulfur dioxide enters a subsequent sulfur dioxide conversion tower for retreatment. By adopting the tail gas purification device, hydrogen chloride gas and sulfur dioxide gas in the tail gas can be completely purified, the obtained hydrochloric acid and sulfur dioxide are convenient to recycle later, the resource utilization rate is improved, and the production cost is further reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of chemical equipment, especially relates to a double chlorosulfonamide production tail gas treatment system. BACKGROUND

[0002] Double chlorosulfonamide is a common organic synthesis intermediate, is widely used in the field such as pesticide, medicine, dye, has very high economic value.Double chlorosulfonamide is synthesized with chlorosulfoxide, chlorosulfonic acid and aminosulfonic acid, and the reaction process is as follows:

[0003] 2SOCl2+ClSO3H+NH2SO3H Cl2HNO4S2+2SO2 +3HCl .

[0004] Because double chlorosulfonamide production process exhausts tail gas containing a large amount of sulfur dioxide and hydrogen chloride, if not to be handled, will cause pollution to the atmosphere.

[0005] At present, double chlorosulfonamide production tail gas purification equipment only absorbs a certain amount of sulfur dioxide and hydrogen chloride through absorption equipment, harmful gas in tail gas cannot be completely purified, still can cause pollution to the surrounding atmospheric environment, and sulfur dioxide cannot be recycled and reused, will cause certain resource waste. INVENTION CONTENTS

[0006] In order to solve the above problems, the utility model provides a double chlorosulfonamide production tail gas treatment system.

[0007] In order to achieve the above object, the technical scheme that the utility model adopts is as follows:

[0008] A double chlorosulfonamide production tail gas treatment system, including the buffer tank for being connected with tail gas pipe, the bottom of buffer tank is equipped with discharge valve, the upper portion gas outlet of buffer tank is connected with the top gas inlet of falling film absorber through exhaust pipe, the bottom outlet of falling film absorber is connected with the circulating tank for containing hydrochloric acid, the circulating pump is connected with the upper portion liquid inlet of falling film absorber and hydrochloric acid tank respectively, the lower portion gas outlet of falling film absorber is connected with the lower portion of packing tower, the bottom of packing tower is connected with circulating tank, the top gas outlet of packing tower is connected with the lower portion gas inlet of drying tower, the top gas outlet of drying tower is connected with the subsequent sulfur dioxide conversion tower, the absorption medium in falling film absorber and packing tower is all water, and the drying medium in drying tower is concentrated sulfuric acid.

[0009] Further, the falling film absorber and the circulating tank are two, respectively, the first falling film absorber, the second falling film absorber, the first circulating tank and the second circulating tank, the buffer tank is connected with the top gas inlet of the first falling film absorber through the exhaust pipe, the bottom outlet of the first falling film absorber is connected with the first circulating tank, the first circulating tank is connected with the upper liquid inlet of the first falling film absorber and the hydrochloric acid tank through the circulating pump, the lower gas outlet of the first falling film absorber is connected with the top gas inlet of the second falling film absorber; the bottom outlet of the second falling film absorber is connected with the second circulating tank, the second circulating tank is connected with the upper liquid inlet of the second falling film absorber and the first circulating tank through the circulating pump, the lower gas outlet of the second falling film absorber is connected with the lower part of the packing tower.

[0010] Further, the bottom outlet of the first falling film absorber and the second falling film absorber is connected with the first circulating tank and the second circulating tank through the discharge pipe, respectively, the middle part of the discharge pipe is provided with a back bend, and the bottom of the back bend is provided with a thermometer, the first circulating tank and the second circulating tank are both provided with a liquid level meter.

[0011] Further, the packing tower is two, respectively, the first packing tower and the second packing tower, the bottom of the first packing tower and the second packing tower is connected with the first buffer tank and the second buffer tank for containing hydrochloric acid, respectively, the gas outlet of the second falling film absorber is connected with the lower part of the first packing tower, the circulating pump in the first buffer tank is communicated with the upper part of the first packing tower and the second circulating tank through the hydrochloric acid pipe; the top gas outlet of the first packing tower is connected with the lower part of the second packing tower through the gas outlet pipe, the circulating pump in the second buffer tank is communicated with the upper part of the second packing tower and the first buffer tank through the hydrochloric acid pipe, the first buffer tank and the second buffer tank are connected; the first buffer tank and the second buffer tank are both provided with a stirrer.

[0012] Further, the top gas outlet of the second packing tower is connected with the water seal box through the branch pipe, the exhaust pipe of the water seal box is connected with the lower part of the first alkali absorption tower, the circulating pump is arranged in the storage tank at the bottom of the first alkali absorption tower, for conveying the liquid in the storage tank to the upper part of the first alkali absorption tower; the top gas outlet of the first alkali absorption tower is connected with the lower part of the second alkali absorption tower through the gas outlet pipe, the circulating pump is arranged in the storage tank at the bottom of the second alkali absorption tower, for conveying the liquid in the storage tank to the upper part of the second alkali absorption tower and the storage tank at the bottom of the first alkali absorption tower, the top gas outlet of the second alkali absorption tower is connected with the induced draft fan; the bottom storage tank in the first alkali absorption tower and the second alkali absorption tower is both provided with a stirrer, the absorption medium in the first alkali absorption tower and the second alkali absorption tower is sodium hydroxide, for neutralization reaction with hydrogen chloride gas.

[0013] Further, a pressure sensor is arranged on the top gas outlet pipe of the filler tower, and the pressure sensor is linked with the air blower, the primary alkali absorption tower and the circulating pump in the bottom storage tank of the secondary alkali absorption tower.

[0014] Further, the bottom of the drying tower is communicated with a sulfuric acid tank, the concentration of sulfuric acid in the sulfuric acid tank is 93%, and a stirrer is arranged in the sulfuric acid tank; the concentrated sulfuric acid in the sulfuric acid tank is delivered to the upper part of the drying tower through a circulating pump, a heat exchanger is arranged on the discharge pipe of the circulating pump; the top gas outlet pipe of the drying tower is connected with an air blower, and the exhaust port of the air blower is connected with a sulfur dioxide conversion tower.

[0015] Further, a pressure sensor is arranged on the top gas outlet pipe of the drying tower, and a control valve and a flow meter are arranged on the bottom gas inlet pipe of the drying tower, and the air blower is linked with the pressure sensor and the control valve.

[0016] Further, the two hydrochloric acid tanks are connected in parallel with the output pipe of the circulating tank; the bottom discharge ports of the two hydrochloric acid tanks are connected with hydrochloric acid pumps, and a liquid level meter is arranged on the hydrochloric acid tank.

[0017] Compared with the prior art, the technical progress achieved by the utility model lies in that:

[0018] The utility model discloses a buffer tank can recycle the material liquid carried in the exhaust pipe, and utilize falling film absorber to convert hydrogen chloride gas in tail gas into hydrochloric acid, and the tail gas discharged from the falling film absorber enters the filler tower, further converts the excessive hydrogen chloride gas into hydrochloric acid, and the obtained hydrochloric acid converges to the hydrochloric acid tank and is stored for convenient reuse, and the tail gas discharged from the filler tower enters the drying tower and utilizes concentrated sulfuric acid to dry the water-containing sulfur dioxide in the tail gas, and the dried sulfur dioxide enters the subsequent sulfur dioxide conversion tower and is processed again. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings are used to provide further understanding of the utility model and constitute a part of the specification, are used to explain the utility model together with the embodiments of the utility model, and do not constitute the limitation on the utility model.

[0020] In the drawings:

[0021] Figure 1 The utility model discloses a kind of double chlorosulfonimide production tail gas processing system's structure schematic view provided for embodiment of the utility model;

[0022] In the drawing:

[0023] 8 - tail gas pipe; 9 - control valve; 10 - pressure sensor; 11 - thermometer; 12 - stirrer; 13 - liquid level meter; 14 - flow meter;

[0024] 401 - buffer tank; 402 - circulating pump; 403 - hydrochloric acid tank; 404 - drying tower; 405 - back bend section; 406 - water seal box; 407 - first-stage alkali absorption tower; 408 - second-stage alkali absorption tower; 409 - induced draft fan; 413 - sulfuric acid tank; 414 - heat exchanger; 415 - fan; 416 - hydrochloric acid pump;

[0025] 410 - falling film absorber, 411 - first-stage falling film absorber, 412 - second-stage falling film absorber; 420 - circulating tank, 421 - first-stage circulating tank, 422 - second-stage circulating tank; 430 - packed tower, 431 - first-stage packed tower, 432 - second-stage packed tower, 433 - first-stage buffer tank, 434 - second-stage buffer tank. DETAILED DESCRIPTION

[0026] The following specific embodiments can be combined with each other, and the same or similar concepts or processes can not be described again in some embodiments. The embodiments of the present application will be described below with reference to the accompanying drawings.

[0027] As shown in Figure 1 A dithiole treatment system for tail gas, the tail gas treatment system comprises a buffer tank 401 connected with a tail gas pipe 8, the bottom of the buffer tank 401 is provided with a discharge valve, the upper gas outlet of the buffer tank 401 is connected with the top gas inlet of a falling film absorber 410 through an exhaust pipe, the bottom outlet of the falling film absorber 410 is connected with a circulating tank 420 for containing hydrochloric acid, the circulating tank 420 is connected with the upper liquid inlet of the falling film absorber 410 and a hydrochloric acid tank 403 through a circulating pump 402, respectively, the lower gas outlet of the falling film absorber 410 is connected with the lower part of a packed tower 430; the bottom of the packed tower 430 is connected with the circulating tank 420, the top gas outlet of the packed tower 430 is connected with the lower gas inlet of a drying tower 404, the top gas outlet of the drying tower 404 is connected with a subsequent sulfur dioxide conversion tower; the absorption medium in the falling film absorber 410 and the packed tower 430 is water, and the drying medium in the drying tower 404 is concentrated sulfuric acid. The material carried by the tail gas can be retained in the buffer tank, the hydrogen chloride gas in the tail gas is combined with water to form hydrochloric acid when passing through the falling film absorber and the packed tower, and the hydrochloric acid is stored in the hydrochloric acid tank; then it enters the drying tower, the sulfur dioxide with humidity is dried by concentrated sulfuric acid, and then it is conveniently reused in the subsequent sulfur dioxide conversion tower.

[0028] As a preferred structure, the falling film absorber 410 and the circulating tank 420 are both two, which are respectively a first falling film absorber 411, a second falling film absorber 412, a first circulating tank 421 and a second circulating tank 422. The buffer tank 401 is connected with the top gas inlet of the first falling film absorber 411 through a gas exhaust pipe. The bottom outlet of the first falling film absorber 411 is connected with the first circulating tank 421. The first circulating tank 421 is connected with the upper liquid inlet of the first falling film absorber 411 and the feed inlet of the hydrochloric acid tank 403 through a circulating pump 402. The lower gas outlet of the first falling film absorber 411 is connected with the top gas inlet of the second falling film absorber 412. The bottom outlet of the second falling film absorber 412 is connected with the second circulating tank 422. The second circulating tank 422 is connected with the upper liquid inlet of the second falling film absorber 412 and the first circulating tank 421 through a circulating pump 402. The lower gas outlet of the second falling film absorber 412 is connected with the lower part of the packed tower 430. The use of two groups of falling film absorbers 410 and circulating tanks 420 can improve the tail gas treatment capacity. The use of circulating tanks and circulating pumps can realize the circulation of materials and further improve the recovery rate of hydrogen chloride.

[0029] Further optimization of the above structure, the bottom outlet of the first falling film absorber 411 and the second falling film absorber 412 is connected with the first circulating tank 421 and the second circulating tank 422 through the discharge pipe, respectively. The middle part of the discharge pipe is provided with a return bend 405, and the bottom of the return bend 405 is provided with a thermometer 11. The first circulating tank 421 and the second circulating tank 422 are both provided with a liquid level meter. The use of the return bend can avoid the impact of the material on the circulating tank, and improve the safety factor.

[0030] Similarly, the packed tower 430 is two, which are respectively a first packed tower 431 and a second packed tower 432. The bottom of the first packed tower 431 and the second packed tower 432 is connected with a first buffer tank 433 and a second buffer tank 434 for containing hydrochloric acid, respectively. The gas outlet of the second falling film absorber 412 is connected with the lower part of the first packed tower 431. The circulating pump 402 in the first buffer tank 433 is connected with the upper part of the first packed tower 431 and the second circulating tank 422 through a hydrochloric acid pipe. The top gas outlet of the first packed tower 431 is connected with the lower part of the second packed tower 432 through a gas exhaust pipe. The circulating pump in the second buffer tank 434 is connected with the upper part of the second packed tower 432 and the first buffer tank 433 through a hydrochloric acid pipe. The first buffer tank 433 and the second buffer tank 434 are connected. The first buffer tank 433 and the second buffer tank 434 are both provided with a stirrer 12. The first buffer tank and the second buffer tank are both provided with a liquid level meter (liquid level transmitter). The first buffer tank and the second buffer tank are both provided with a liquid level meter (liquid level transmitter). The use of the above structure can further improve the tail gas treatment capacity, and further improve the recovery rate of hydrogen chloride.

[0031] Specifically designed, the top of the second filler tower 432 gas outlet through the branch and water seal tank 406, the exhaust pipe of the water seal tank 406 and the lower part of the first alkali absorption tower 407, the bottom of the first alkali absorption tower 407 tank is provided with circulating pump 402, for the storage tank in the liquid delivery to the upper part of the first alkali absorption tower 407; the top of the first alkali absorption tower 407 gas outlet through the gas pipe and the lower part of the second alkali absorption tower 408, the bottom of the second alkali absorption tower 408 tank is provided with circulating pump, for the storage tank in the liquid delivery to the upper part of the second alkali absorption tower 408 and the first alkali absorption tower 407 bottom tank, the top of the second alkali absorption tower 408 gas outlet and induced draft fan 409; the bottom of the first alkali absorption tower 407 and the second alkali absorption tower 408 tank is provided with agitator 12, the first alkali absorption tower 407 and the second alkali absorption tower 408 in the absorption medium is sodium hydroxide, for neutralization reaction with hydrogen chloride gas. Among them, the first alkali absorption tower 407 and the second alkali absorption tower 408 bottom tank is provided with liquid level meter (liquid level transmitter). When the drying tower exists fault or overhaul, the alkali absorption method is used to remove the sulfur dioxide in the tail gas, first, the tail gas enters the water seal and the water in it, then enters the series of first alkali absorption tower and second alkali absorption tower, can make the sulfur dioxide and internal sodium hydroxide neutralization reaction, play the purpose of purifying tail gas.

[0032] Specifically designed, the top of the second filler tower 432 gas outlet pipe is provided with pressure sensor 10, the pressure sensor 10 can be linked with induced draft fan 409, the first alkali absorption tower 407 and the circulating pump 402 in the bottom tank. The use of this structure can ensure the safe operation of the equipment.

[0033] Further, the bottom of the drying tower 404 is communicated with sulfuric acid tank 413, the concentration of sulfuric acid in the sulfuric acid tank 403 is 93%, and the sulfuric acid tank 403 is provided with agitator 12; the concentrated sulfuric acid in the sulfuric acid tank 403 is delivered to the upper part of the drying tower 404 by circulating pump, and the discharge pipe of the circulating pump is provided with heat exchanger 414; the top gas outlet pipe of the drying tower 404 is connected with fan 415, and the exhaust port of the fan 415 is connected with sulfur dioxide conversion tower. Among them, the gas pipe of the drying tower 404 is provided with pressure sensor, the bottom gas inlet pipe of the drying tower 404 is provided with control valve 9 and flow meter 14, and the fan can be linked with pressure sensor and control valve. When the sulfur dioxide in the tail gas passes through the drying tower, the concentrated sulfuric acid will absorb the moisture in the sulfur dioxide, so as to realize the purpose of drying the sulfur dioxide.

[0034] Specifically designed, the hydrochloric acid tank 403 is two, the feed pipe of the two hydrochloric acid tank 403 is connected in parallel on the output pipe of the circulating tank 420; the bottom discharge port of the two hydrochloric acid tank 403 is connected with hydrochloric acid pump 416, and the hydrochloric acid tank 403 is provided with liquid level sensor.

[0035] In view of the corrosion of hydrogen chloride and sulfur dioxide, in the specific production, the pipeline in the tail gas treatment system is made of FRP (fiber reinforced plastic) material, and the corrosion resistance of FRP is used to improve the service life of the pipeline.

[0036] In summary, the utility model has the advantages of reasonable structure design and complete tail gas purification, when the tail gas passes through the falling film absorber and the filler tower in turn, the hydrogen chloride gas combines with water to form hydrochloric acid, then the sulfur dioxide in the tail gas passes through the drying tower, the concentrated sulfuric acid absorbs the moisture in the sulfur dioxide, the dried sulfur dioxide enters the subsequent sulfur dioxide conversion tower for further treatment, which is convenient for recycling. The hydrogen chloride gas and sulfur dioxide gas in the tail gas can be completely purified by using the utility model, the obtained hydrochloric acid and sulfur dioxide are convenient for reuse, the resource utilization rate is improved, and the production cost is reduced.

[0037] Finally, it should be noted that: the above only for the preferred embodiments of the utility model, and not for limiting the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of the technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model, should be included in the scope of protection of the utility model claims.

Claims

1. A tail gas treatment system for dichlorosulfonylimide production, characterized in that: The application relates to a sulfuric acid production device, which comprises a buffer tank connected with a tail gas pipe, a discharge valve arranged at the bottom of the buffer tank, an upper gas outlet of the buffer tank connected with a top gas inlet of a falling film absorber through an exhaust pipe, a bottom outlet of the falling film absorber connected with a circulating tank for containing hydrochloric acid, the circulating tank connected with an upper liquid inlet of the falling film absorber and a hydrochloric acid tank through a circulating pump, and a lower gas outlet of the falling film absorber connected with a lower part of a packed tower.

2. A system for treating a dcsulfoniimc production off-gas according to claim 1, characterized in that: The falling film absorber and the circulating tank are two, respectively a first falling film absorber, a second falling film absorber, a first circulating tank and a second circulating tank, the buffer tank is connected with the top gas inlet of the first falling film absorber through the exhaust pipe, the bottom outlet of the first falling film absorber is connected with the first circulating tank, the first circulating tank is connected with the upper liquid inlet of the first falling film absorber and the hydrochloric acid tank through the circulating pump, the lower gas outlet of the first falling film absorber is connected with the top gas inlet of the second falling film absorber, the bottom outlet of the second falling film absorber is connected with the second circulating tank, the second circulating tank is connected with the upper liquid inlet of the second falling film absorber and the first circulating tank through the circulating pump, and the lower gas outlet of the second falling film absorber is connected with the lower part of the packed tower.

3. A system for treating a dcsulfoniimc production off-gas according to claim 2, characterized in that: The bottom outlets of the first falling film absorber and the second falling film absorber are connected with the first circulating tank and the second circulating tank through discharge pipes, the middle parts of the discharge pipes are provided with return bends, the bottoms of the return bends are provided with thermometers, and the first circulating tank and the second circulating tank are provided with liquid level meters.

4. The system for treating a dcsulfoniimc production off-gas according to claim 2, characterized in that: The packed tower is two, respectively a first packed tower and a second packed tower, the bottoms of the first packed tower and the second packed tower are connected with a first buffer tank and a second buffer tank for containing hydrochloric acid, the gas outlet of the second falling film absorber is connected with the lower part of the first packed tower, the circulating pump in the first buffer tank is connected with the upper part of the first packed tower and the second circulating tank through hydrochloric acid pipes, the top gas outlet of the first packed tower is connected with the lower part of the second packed tower through an exhaust pipe, the circulating pump in the second buffer tank is connected with the upper part of the second packed tower and the first buffer tank through hydrochloric acid pipes, the first buffer tank and the second buffer tank are connected, and the first buffer tank and the second buffer tank are provided with stirrers.

5. A system for treating a dcsulfoniimc production off-gas according to claim 4, characterized in that: The top gas outlet of the secondary filler tower is connected with the water seal box through a branch pipe, the exhaust pipe of the water seal box is connected with the lower part of the primary alkali absorption tower, a circulating pump is arranged in the storage tank at the bottom of the primary alkali absorption tower, and is used for conveying the liquid in the storage tank to the upper part of the primary alkali absorption tower; the top gas outlet of the primary alkali absorption tower is connected with the lower part of the secondary alkali absorption tower through a gas outlet pipe, a circulating pump is arranged in the storage tank at the bottom of the secondary alkali absorption tower, and is used for conveying the liquid in the storage tank to the upper part of the secondary alkali absorption tower and the storage tank at the bottom of the primary alkali absorption tower, and the top gas outlet of the secondary alkali absorption tower is connected with the induced draft fan; a stirrer is arranged in the bottom storage tank of the primary alkali absorption tower and the secondary alkali absorption tower, and the absorption medium in the primary alkali absorption tower and the secondary alkali absorption tower is sodium hydroxide, which is used for neutralization reaction with hydrogen chloride gas.

6. A system for treating a dcsulfoniimc production off-gas according to claim 5, characterized in that: A pressure sensor is arranged on the top gas outlet pipe of the filler tower, and the pressure sensor can be linked with the induced draft fan, the circulating pump in the bottom storage tank of the primary alkali absorption tower and the bottom storage tank of the secondary alkali absorption tower.

7. The system for treating a tail gas from a production of a bischlorosulfonimide according to claim 1, characterized in that: The bottom of the drying tower is communicated with a sulfuric acid tank, the concentration of sulfuric acid in the sulfuric acid tank is 93%, and a stirrer is arranged in the sulfuric acid tank; the concentrated sulfuric acid in the sulfuric acid tank is conveyed to the upper part of the drying tower through a circulating pump, and a heat exchanger is arranged on the discharge pipe of the circulating pump; the top gas outlet pipe of the drying tower is connected with a fan, and the exhaust port of the fan is connected with a sulfur dioxide conversion tower.

8. A system for treating a dcsulfoniimc production off-gas according to claim 7, characterized in that: A pressure sensor is arranged on the gas outlet pipe of the drying tower, a control valve and a flow meter are arranged on the bottom gas inlet pipe of the drying tower, and the fan can be linked with the pressure sensor and the control valve.

9. A system for treating a dcsulfone tail gas according to any one of claims 1-8, characterized in that: The hydrochloric acid tank is two, the feed pipes of the two hydrochloric acid tanks are connected in parallel on the output pipe of the circulating tank; the bottom discharge ports of the two hydrochloric acid tanks are connected with hydrochloric acid pumps, and a liquid level meter is arranged on the hydrochloric acid tank.

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