CN216537771U - Processing system for processing N-o-tolylthiourea reaction tail gas - Google Patents
Processing system for processing N-o-tolylthiourea reaction tail gas Download PDFInfo
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- CN216537771U CN216537771U CN202122416924.8U CN202122416924U CN216537771U CN 216537771 U CN216537771 U CN 216537771U CN 202122416924 U CN202122416924 U CN 202122416924U CN 216537771 U CN216537771 U CN 216537771U
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Abstract
The utility model provides a treatment system for treating N-o-tolyl thiourea reaction tail gas, which comprises a first-stage absorption tower, a second-stage absorption tower, a third-stage absorption tower, an absorption fan and a chimney which are sequentially connected, wherein each stage of absorption tower is provided with a circulating pump, and liquid caustic soda is introduced into the first-stage absorption tower from the third-stage absorption tower through the circulating pump step by step; the alkali liquor is fully utilized, and the treatment efficiency is improved; in order to ensure that waste gas is discharged in time, an air pressure meter is arranged on an outlet gas phase pipe of each stage of absorption tower, each kettle is ensured to be in a micro-negative pressure state, harmful gas is ensured to be discharged in time, and safety is ensured. The method solves the problem that irritant gas generated in the preparation process of the N-o-tolylthiourea is difficult to remove, ensures that the treated product does not generate pollution any more, converts all waste gas into salt for extraction, does not pollute the environment, and can reduce the cost. The utility model has simple structure, low cost, low equipment requirement and simple and convenient operation, is suitable for industrial continuous operation, and ensures that the absorbed waste gas is qualified for monitoring.
Description
Technical Field
The utility model relates to the technical field of separation, in particular to a treatment system for treating N-o-tolylthiourea reaction tail gas.
Background
N-o-tolylthiourea, molecular formula C8H10N2S, white or reddish granular crystal, insoluble in water and bitter, soluble in concentrated sulfuric acid, chloroform, ethanol, methanol, etc. The compound is used as a pesticide intermediate for preparing a rice plant protection agent and plays an important role in the development of agriculture. The conventional preparation method comprises the steps of putting prepared sodium thiocyanate solution into an enamel reaction kettle, putting o-toluidine under stirring, cooling the material to a specified temperature, dropwise adding concentrated sulfuric acid into the material within the specified temperature range, raising the temperature in stages after dropwise adding, keeping the temperature until the residue reaches the standard, adding water, diluting for 2 times at the same temperature, cooling, filtering, washing and drying to obtain the finished product. In the reaction process for preparing the N-o-tolylthiourea, sodium thiocyanate and dilute sulfuric acid do not react under normal conditions, but the sodium thiocyanate and concentrated sulfuric acid react under the heating condition to generate waste gas.
2NaSCN+4H2SO4(concentrated) ═ 4SO2+CO2+Na2SO4+2H2O (heating)
NaSCN+H2O+H2SO4→COS+Na2SO4
Waste gas is generated in the production process of the N-o-tolylthiourea, the waste gas contains toxic, harmful and pungent gases such as sulfur dioxide, carbon dioxide, carbonyl sulfide and the like, the carbonyl sulfide is extremely flammable, vapor of the carbonyl sulfide is mixed with air to form an explosive mixture, and the mixture is easy to catch fire when meeting static electricity to cause safety accidents. It must be removed as soon as possible to ensure safety. However, sodium hypochlorite is generally adopted for oxidation and absorption in the prior art production, the cost is high, and the generated waste liquid is difficult to treat.
Carbonyl sulfide (chemical formula: COS), also known as carbonyl sulfide, is a colorless gas with a smell of rotten eggs in the normal state. It is an inorganic carbon compound structurally similar to carbon disulfide and carbon dioxide, the gaseous COS molecule is linear, and a carbon atom is connected with an oxygen atom and a sulfur atom by two double bonds respectively. Carbonyl sulfide is relatively stable, but reacts strongly with oxidizing agents, and can also corrode metals in the presence of moisture. Flammable, toxic, and, like hydrogen sulfide, can underestimate its concentration in air.
Therefore, the off-gas generated from N-o-tolylthiourea is difficult to treat.
Disclosure of Invention
The utility model provides a treatment system for treating N-o-tolylthiourea reaction tail gas, aiming at solving the problem that carbonyl sulfide and other byproducts in waste gas generated by N-o-tolylthiourea are difficult to treat, and the treatment system comprises an absorption tower and an absorption fan which are sequentially connected through a pipeline; the gas phase outlet of the reaction kettle is provided with an air pressure gauge and a butterfly valve. The utility model has simple structure, low cost, low equipment requirement and simple and convenient operation, is suitable for industrial continuous production, and can discharge the waste gas after reaching the standard after treatment and form salt solution after absorption so as to be convenient for recovery treatment, thereby solving the problem of heavy irritant waste gas in the preparation process of the N-o-tolylthiourea.
The utility model provides a treatment system for treating N-o-tolylthiourea reaction tail gas, which comprises a primary absorption tower, a secondary absorption tower, a tertiary absorption tower, an absorption fan and a chimney, wherein the primary absorption tower, the secondary absorption tower, the tertiary absorption tower, the absorption fan and the chimney are sequentially connected;
the primary absorption tower comprises a primary absorption tower body, a primary absorption tower gas phase inlet arranged at the lower end of the primary absorption tower body, a primary absorption tower gas phase outlet arranged at the upper end of the primary absorption tower body, a primary absorption tower storage tank arranged at the lower end of the primary absorption tower body and communicated with the primary absorption tower body, a primary absorption tower liquid phase inlet arranged at one side of the primary absorption tower storage tank, a primary absorption tower liquid phase outlet arranged at the other side of the primary absorption tower storage tank, a primary spray head arranged at the upper end inside the primary absorption tower body and connected with the primary absorption tower liquid phase outlet, a primary circulating pump arranged between the primary absorption tower liquid phase outlet and the primary spray head, a primary absorption tower blast gauge arranged on a primary absorption tower gas phase outlet pipeline, and a primary absorption tower waste liquid outlet arranged on one side of the primary absorption tower storage tank opposite to the primary absorption tower liquid phase outlet, the gas phase inlet of the first-stage absorption tower is connected with the N-o-tolylthiourea reaction tail gas, and the gas phase inlet of the first-stage absorption tower and the liquid phase inlet of the first-stage absorption tower are positioned at the same side;
the second-stage absorption tower comprises a second-stage absorption tower body, a second-stage absorption tower gas-phase inlet arranged at the lower end of the second-stage absorption tower body, a second-stage absorption tower gas-phase outlet arranged at the upper end of the second-stage absorption tower body, a second-stage absorption tower storage tank arranged at the lower end of the second-stage absorption tower body and communicated with the second-stage absorption tower body, a second-stage absorption tower liquid-phase inlet arranged at one side of the second-stage absorption tower storage tank, a second-stage absorption tower liquid-phase outlet arranged at the other side of the second-stage absorption tower storage tank, a second-stage spray header arranged at the upper end inside the second-stage absorption tower body and connected with the second-stage absorption tower liquid-phase outlet, a second-stage circulating pump arranged between the second-stage absorption tower liquid-phase outlet and the second-stage spray header, a second-absorption tower blast gauge arranged on a second-stage absorption tower gas-phase outlet pipeline and a second-stage absorption tower waste liquid-phase outlet arranged on one side of the second-absorption tower storage tank opposite to the second-absorption tower liquid-phase outlet, the gas phase inlet of the secondary absorption tower is connected with the gas phase outlet of the primary absorption tower, and the gas phase inlet of the secondary absorption tower and the liquid phase inlet of the secondary absorption tower are positioned at the same side;
the three-stage absorption tower comprises a three-stage absorption tower body, a three-stage absorption tower gas phase inlet arranged at the lower end of the three-stage absorption tower body, a three-stage absorption tower gas phase outlet arranged at the upper end of the three-stage absorption tower body, a three-stage absorption tower storage tank arranged at the lower end of the three-stage absorption tower body and communicated with the three-stage absorption tower body, a three-stage absorption tower liquid phase inlet arranged at one side of the three-stage absorption tower storage tank, a three-stage absorption tower liquid phase outlet arranged at the other side of the three-stage absorption tower storage tank, a three-stage spray head arranged at the upper end inside the three-stage absorption tower body and connected with the three-stage absorption tower liquid phase outlet, a three-stage circulating pump arranged between the three-stage absorption tower liquid phase outlet and the three-stage spray head, a three-stage absorption tower blast gauge arranged on a pipeline of the three-stage absorption tower gas phase outlet and a three-stage absorption tower waste liquid phase outlet arranged on one side of the three-stage absorption tower storage tank opposite to the three-stage absorption tower liquid phase outlet, the gas phase inlet of the third-stage absorption tower is connected with the gas phase outlet of the second-stage absorption tower, the gas phase outlet of the third-stage absorption tower is connected with the absorption fan, and the gas phase inlet of the third-stage absorption tower and the liquid phase inlet of the third-stage absorption tower are positioned on the same side;
the liquid phase outlet of the third-stage absorption tower is connected with the liquid phase inlet of the second-stage absorption tower, and the liquid phase outlet of the second-stage absorption tower is connected with the liquid phase inlet of the first-stage absorption tower.
The utility model relates to a treatment system for treating N-o-tolylthiourea reaction tail gas, which is characterized in that a first-stage absorption tower gas-phase outlet, a second-stage absorption tower gas-phase outlet and a third-stage absorption tower gas-phase outlet are provided with butterfly valves as an optimal mode.
As a preferred mode, the pH value inside the primary absorption tower body is 8-9.
As a preferable mode, the pH value in the secondary absorption tower body is 11-12.
As a preferable mode, the pH value inside the three-stage absorption tower body is 11-12.
As an optimal mode, alkali liquor is contained in a first-stage absorption tower storage tank, a second-stage absorption tower storage tank and a third-stage absorption tower storage tank.
As an optimal mode, the primary absorption tower wind pressure gauge, the secondary absorption tower wind pressure gauge and the tertiary absorption tower wind pressure gauge are all online wind pressure gauges.
The utility model provides a treatment system device for N-o-tolylthiourea reaction tail gas, which comprises a primary absorption tower, a secondary absorption tower, a tertiary absorption tower and an absorption fan, wherein the primary absorption tower is connected with the secondary absorption tower; the gas phase outlet of the first-stage absorption tower is connected with the gas phase inlet of the second-stage absorption tower; the gas phase outlet of the second-stage absorption tower is connected with the gas phase inlet of the third-stage absorption tower, and an absorption fan is arranged at the gas phase outlet of the third-stage absorption tower and is connected with a chimney;
in order to make the liquid caustic soda fully utilized, the device also comprises a circulating pump, a liquid caustic soda storage tank and a spray header; the circulating pump is arranged at each stage of absorption tower, and liquid caustic soda is introduced into the first-stage absorption tower from the third-stage absorption tower step by step through the circulating pump; the liquid caustic soda storage tank is arranged at the bottom of each stage of absorption tower and used for storing liquid caustic soda, and the liquid caustic soda in the storage tank at the bottom is circularly sprayed by a liquid caustic soda circulating pump; the spray header is arranged at the upper end of each stage of absorption tower, and the liquid caustic soda is in reverse contact with the tail gas in a spray mode.
In order to ensure that the waste gas is timely discharged, the device also comprises a wind pressure gauge; the air pressure meter is arranged at an outlet gas phase pipe of each stage of absorption tower, so that each kettle is ensured to be in a micro-negative pressure state, harmful gas is ensured to be discharged in time, and safety is ensured.
In order to solve the problem that irritant gas generated in the preparation process of N-o-tolylthiourea is difficult to remove, ensure that the treated product does not generate pollution any more, convert all waste gas into salt and then extract, not only can not pollute the environment, but also can reduce the cost. The utility model has simple structure, low cost, low equipment requirement and simple and convenient operation, is suitable for industrial continuous operation, and ensures that the absorbed waste gas is qualified for monitoring.
The using method of the utility model comprises the following steps: the liquid caustic soda is adopted to absorb harmful substances in the waste gas, the carbonyl sulfide, the sulfur dioxide and the carbon dioxide in the waste gas react with the liquid caustic soda to generate a salt solution, and the salt solution is extracted into mixed salt through multiple effects.
COS:4NaOH+COS＝＝＝Na2S+Na2CO3+2H2O
CO2:CO2When not enough, 2NaOH + CO2＝Na2CO3+H2O
CO2In excess, 2NaOH + CO2＝Na2CO3+H2O
H2O+CO2+Na2CO3＝2NaHCO3
SO2When the NaOH is excessive, 2NaOH + SO2＝NaSO3＝2H2O
SO2When excessive, NaOH + SO2＝NaHSO3+H2O
Comprises three-stage absorption towers which are connected in sequence through pipelines;
the gas phase outlet is provided with an air pressure gauge;
the absorption liquid used is liquid alkali.
The utility model has the following advantages:
(1) the utility model comprises three stages of absorption towers which are sequentially connected through a pipeline, wherein each stage of absorption tower is provided with a circulating pump, and liquid caustic soda is introduced into the first stage of absorption tower from the third stage of absorption tower through the circulating pump step by step; the alkali liquor is fully utilized, and the treatment efficiency is improved.
(2) In order to ensure that waste gas is discharged in time, the air pressure meter is arranged on the outlet gas phase pipe of each stage of absorption tower, so that each kettle is ensured to be in a micro-negative pressure state, harmful gas is ensured to be discharged in time, and safety is ensured.
(3) The method solves the problem that irritant gas generated in the preparation process of the N-o-tolylthiourea is difficult to remove, ensures that the treated product does not generate pollution any more, converts all waste gas into salt for extraction, does not pollute the environment, and can reduce the cost. The utility model has simple structure, low cost, low equipment requirement and simple and convenient operation, is suitable for industrial continuous operation, and ensures that the absorbed waste gas is qualified for monitoring.
Drawings
FIG. 1 is a schematic structural diagram of a treatment system for treating reaction tail gas of N-o-tolylthiourea.
Reference numerals:
1. a first-stage absorption tower; 11. a primary absorber body; 12. a gas phase inlet of the first-stage absorption tower; 13. a gas phase outlet of the first-stage absorption tower; 14. a first-stage absorption tower storage tank; 15. a liquid phase inlet of the primary absorption tower; 16. a liquid phase outlet of the primary absorption tower; 17. a first stage showerhead; 18. A first-stage circulating pump; 19. a primary absorption tower wind pressure gauge; 1a, a waste liquid outlet of a primary absorption tower; 2. a secondary absorption tower; 21. a secondary absorption tower body; 22. a gas phase inlet of the secondary absorption tower; 23. a gas phase outlet of the secondary absorption tower; 24. a secondary absorption tower storage tank; 25. a liquid phase inlet of the secondary absorption tower; 26. a liquid phase outlet of the secondary absorption tower; 27. a secondary spray header; 28. A second-stage circulating pump; 29. a secondary absorption tower wind pressure gauge; 2a, a secondary absorption tower waste liquid outlet; 3. a third stage absorption tower; 31. a tertiary absorption tower body; 32. a gas phase inlet of the third-stage absorption tower; 33. a gas phase outlet of the third-stage absorption tower; 34. a third-stage absorption tower storage tank; 35. a liquid phase inlet of the third-stage absorption tower; 36. a liquid phase outlet of the third-stage absorption tower; 37. a third stage spray header; 38. A three-stage circulating pump; 39. a third-stage absorption tower wind pressure gauge; 3a, a waste liquid outlet of the third-stage absorption tower; 4. an absorption fan; 5. and (4) a chimney.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
As shown in fig. 1, a treatment system for treating N-o-tolylthiourea reaction tail gas comprises a first-stage absorption tower 1, a second-stage absorption tower 2, a third-stage absorption tower 3, an absorption fan 4 and a chimney 5 which are sequentially connected with the third-stage absorption tower 3;
the primary absorption tower 1 comprises a primary absorption tower body 11, a primary absorption tower gas phase inlet 12 arranged at the lower end of the primary absorption tower body 11, a primary absorption tower gas phase outlet 13 arranged at the upper end of the primary absorption tower body 11, a primary absorption tower storage tank 14 arranged at the lower end of the primary absorption tower body 11 and communicated with the primary absorption tower body 11, a primary absorption tower liquid phase inlet 15 arranged at one side of the primary absorption tower storage tank 14, a primary absorption tower liquid phase outlet 16 arranged at the other side of the primary absorption tower storage tank 14, a primary spray header 17 arranged at the upper end inside the primary absorption tower body 11 and connected with the primary absorption tower liquid phase outlet 16, a primary circulating pump 18 arranged between the primary absorption tower liquid phase outlet 16 and the primary spray header 17, a primary absorption tower air pressure gauge 19 arranged on a pipeline of the primary absorption tower gas phase outlet 13 and a primary absorption tower waste liquid outlet 1a arranged at one side of the primary absorption tower storage tank 14 opposite to the primary absorption tower liquid phase outlet 16, a gas phase inlet 12 of the primary absorption tower is connected with the N-o-tolylthiourea reaction tail gas, and the gas phase inlet 12 of the primary absorption tower and a liquid phase inlet 15 of the primary absorption tower are positioned at the same side;
the secondary absorption tower 2 comprises a secondary absorption tower body 21, a secondary absorption tower gas phase inlet 22 arranged at the lower end of the secondary absorption tower body 21, a secondary absorption tower gas phase outlet 23 arranged at the upper end of the secondary absorption tower body 21, a secondary absorption tower storage tank 24 arranged at the lower end of the secondary absorption tower body 21 and communicated with the secondary absorption tower body 21, a secondary absorption tower liquid phase inlet 25 arranged at one side of the secondary absorption tower storage tank 24, a secondary absorption tower liquid phase outlet 26 arranged at the other side of the secondary absorption tower storage tank 24, a secondary spray header 27 arranged at the upper end inside the secondary absorption tower body 21 and connected with the secondary absorption tower liquid phase outlet 26, a secondary circulating pump 28 arranged between the secondary absorption tower liquid phase outlet 26 and the secondary spray header 27, a secondary absorption tower air pressure gauge 29 arranged on a pipeline of the secondary absorption tower gas phase outlet 23, and a secondary absorption tower waste liquid outlet 2a arranged at one side of the secondary absorption tower storage tank 24 opposite to the secondary absorption tower liquid phase outlet 26, the gas phase inlet 22 of the secondary absorption tower is connected with the gas phase outlet 13 of the primary absorption tower, and the gas phase inlet 22 of the secondary absorption tower and the liquid phase inlet 25 of the secondary absorption tower are positioned at the same side;
the third-stage absorption tower 3 comprises a third-stage absorption tower body 31, a third-stage absorption tower gas phase inlet 32 arranged at the lower end of the third-stage absorption tower body 31, a third-stage absorption tower gas phase outlet 33 arranged at the upper end of the third-stage absorption tower body 31, a third-stage absorption tower storage tank 34 arranged at the lower end of the third-stage absorption tower body 31 and communicated with the third-stage absorption tower body 31, a third-stage absorption tower liquid phase inlet 35 arranged at one side of the third-stage absorption tower storage tank 34, a third-stage absorption tower liquid phase outlet 36 arranged at the other side of the third-stage absorption tower storage tank 34, a third-stage spray header 37 arranged at the upper end inside the third-stage absorption tower body 31 and connected with the third-stage absorption tower liquid phase outlet 36, a third-stage circulating pump 38 arranged between the third-stage absorption tower liquid phase outlet 36 and the third-stage spray header 37, a third-stage absorption tower air pressure gauge 39 arranged on a pipeline of the third-stage absorption tower gas phase outlet 33, and a third-stage absorption tower waste liquid outlet 3a arranged at one side of the third-stage absorption tower storage tank 34 opposite to the third-stage absorption tower liquid phase outlet 36, the gas phase inlet 32 of the third-stage absorption tower is connected with the gas phase outlet 23 of the second-stage absorption tower, the gas phase outlet 33 of the third-stage absorption tower is connected with the absorption fan 4, and the gas phase inlet 32 of the third-stage absorption tower and the liquid phase inlet 35 of the third-stage absorption tower are positioned on the same side;
the liquid phase outlet 36 of the third-stage absorption tower is connected with the liquid phase inlet 25 of the second-stage absorption tower, and the liquid phase outlet 26 of the second-stage absorption tower is connected with the liquid phase inlet 15 of the first-stage absorption tower;
butterfly valves are arranged at the gas phase outlet 13 of the first-stage absorption tower, the gas phase outlet 23 of the second-stage absorption tower and the gas phase outlet 33 of the third-stage absorption tower;
the pH value inside the first-stage absorption tower body 11 is 8-9;
the pH value in the second-stage absorption tower body 21 is 11-12;
the pH value inside the third-stage absorption tower body 31 is 11-12;
the first-stage absorption tower storage tank 14, the second-stage absorption tower storage tank 24 and the third-stage absorption tower storage tank 34 are used for containing alkali liquor;
the primary absorption tower wind pressure gauge 19, the secondary absorption tower wind pressure gauge 29 and the tertiary absorption tower wind pressure gauge 39 are all online wind pressure gauges.
Example 2
As shown in figure 1, the treatment system for treating the reaction tail gas of the N-o-tolylthiourea comprises a primary absorption tower 1, a secondary absorption tower 2, a tertiary absorption tower 3, an absorption fan 4 and a chimney 5. The above-mentioned device is total two sets of pipelines, the tail gas pipeline: the gas phase outlet 13 of the first-stage absorption tower is connected with the gas phase inlet 22 of the second-stage absorption tower; the gas phase outlet 23 of the second-stage absorption tower is connected with the gas phase inlet 32 of the third-stage absorption tower; the gas phase outlet 33 of the third-stage absorption tower is connected with an absorption fan 4, and the absorption fan 4 is connected with a chimney 5. Liquid caustic soda pipeline: one end of a liquid phase outlet 36 of the third-stage absorption tower is connected with a spray header 37 of the third-stage absorption tower, and the other end is connected with a liquid phase inlet 25 of the second-stage absorption tower; one end of a liquid phase outlet 26 of the secondary absorption tower is connected with a spray header 27 of the secondary absorption tower, and the other end is connected with a liquid phase inlet 15 of the primary absorption tower; the liquid phase outlet 36 of the primary absorption tower is connected with the primary absorption tower spray header 17. And discharging the treated liquid from a waste liquid outlet of the primary absorption tower.
The method of use of examples 1-2 was:
adding a proper amount of liquid caustic soda absorption liquid into all storage tanks below the absorption tower: about 12% -15% of liquid caustic soda is used as absorption liquid, each stage of absorption tower is provided with a circulating pump, the absorption liquid enters from the third stage absorption tower 3 and is conveyed to the second stage absorption tower 2 through the third stage circulating pump 38, and then is conveyed to the first stage absorption tower 1 through the second stage absorption tower 2 through the second stage circulating pump 28. And introducing tail gas from a gas phase inlet 12 of the primary absorption tower, converting the tail gas into salt in the primary absorption tower 1, and recycling the salt in a desalting recovery workshop. And the tail gas which is not absorbed enters a secondary absorption tower 2 and a tertiary absorption tower 3 for continuous absorption. The pH value of the first-stage absorption tower 1 needs to be kept between 8 and 9, and the pH values of the second-stage absorption tower 2 and the third-stage absorption tower 3 are kept between 11 and 12, so that the absorption effect is ensured.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.
Claims (7)
1. A processing system for processing N-o-tolylthiourea reaction tail gas is characterized in that: the device comprises a primary absorption tower (1), a secondary absorption tower (2), a tertiary absorption tower (3), an absorption fan (4) and a chimney (5), which are sequentially connected with each other;
the primary absorption tower (1) comprises a primary absorption tower body (11), a primary absorption tower gas phase inlet (12) arranged at the lower end of the primary absorption tower body (11), a primary absorption tower gas phase outlet (13) arranged at the upper end of the primary absorption tower body (11), a primary absorption tower storage tank (14) arranged at the lower end of the primary absorption tower body (11) and communicated with the primary absorption tower body (11), a primary absorption tower liquid phase inlet (15) arranged at one side of the primary absorption tower storage tank (14), a primary absorption tower liquid phase outlet (16) arranged at the other side of the primary absorption tower storage tank (14), a primary spray header (17) arranged at the upper end inside the primary absorption tower body (11) and connected with the primary absorption tower liquid phase outlet (16), and a primary circulating pump (18) arranged between the primary absorption tower liquid phase outlet (16) and the primary spray header (17), the device comprises a primary absorption tower air pressure gauge (19) arranged on a pipeline of a primary absorption tower gas phase outlet (13) and a primary absorption tower waste liquid outlet (1a) arranged on one side, opposite to a primary absorption tower liquid phase outlet (16), of a primary absorption tower storage tank (14), wherein a primary absorption tower gas phase inlet (12) is connected with N-o-tolyl thiourea reaction tail gas, and the primary absorption tower gas phase inlet (12) and the primary absorption tower liquid phase inlet (15) are positioned on the same side;
the secondary absorption tower (2) comprises a secondary absorption tower body (21), a secondary absorption tower gas phase inlet (22) arranged at the lower end of the secondary absorption tower body (21), a secondary absorption tower gas phase outlet (23) arranged at the upper end of the secondary absorption tower body (21), a secondary absorption tower storage tank (24) arranged at the lower end of the secondary absorption tower body (21) and communicated with the secondary absorption tower body (21), a secondary absorption tower liquid phase inlet (25) arranged at one side of the secondary absorption tower storage tank (24), a secondary absorption tower liquid phase outlet (26) arranged at the other side of the secondary absorption tower storage tank (24), a secondary spray head (27) arranged at the upper end inside the secondary absorption tower body (21) and connected with the secondary absorption tower liquid phase outlet (26), and a secondary circulating pump (28) arranged between the secondary absorption tower liquid phase outlet (26) and the secondary spray head (27), The secondary absorption tower air pressure gauge (29) is arranged on a pipeline of the secondary absorption tower gas phase outlet (23), the secondary absorption tower waste liquid outlet (2a) is arranged on one side, opposite to the secondary absorption tower liquid phase outlet (26), of the secondary absorption tower storage tank (24), the secondary absorption tower gas phase inlet (22) is connected with the primary absorption tower gas phase outlet (13), and the secondary absorption tower gas phase inlet (22) and the secondary absorption tower liquid phase inlet (25) are located on the same side;
the three-stage absorption tower (3) comprises a three-stage absorption tower body (31), a three-stage absorption tower gas phase inlet (32) arranged at the lower end of the three-stage absorption tower body (31), a three-stage absorption tower gas phase outlet (33) arranged at the upper end of the three-stage absorption tower body (31), a three-stage absorption tower storage tank (34) arranged at the lower end of the three-stage absorption tower body (31) and communicated with the three-stage absorption tower body (31), a three-stage absorption tower liquid phase inlet (35) arranged at one side of the three-stage absorption tower storage tank (34), a three-stage absorption tower liquid phase outlet (36) arranged at the other side of the three-stage absorption tower storage tank (34), a three-stage spray head (37) arranged at the upper end inside the three-stage absorption tower body (31) and connected with the three-stage absorption tower liquid phase outlet (36), and a three-stage circulating pump (38) arranged between the three-stage absorption tower liquid phase outlet (36) and the three-stage spray head (37), The three-stage absorption tower air pressure meter (39) is arranged on a pipeline of a gas phase outlet (33) of the three-stage absorption tower, and a three-stage absorption tower waste liquid outlet (3a) is arranged on one side, opposite to a liquid phase outlet (36) of the three-stage absorption tower, of a storage tank (34) of the three-stage absorption tower, the gas phase inlet (32) of the three-stage absorption tower is connected with the gas phase outlet (23) of the second-stage absorption tower, the gas phase outlet (33) of the three-stage absorption tower is connected with the absorption fan (4), and the gas phase inlet (32) of the three-stage absorption tower and the liquid phase inlet (35) of the three-stage absorption tower are located on the same side;
the liquid phase outlet (36) of the third-stage absorption tower is connected with the liquid phase inlet (25) of the second-stage absorption tower, and the liquid phase outlet (26) of the second-stage absorption tower is connected with the liquid phase inlet (15) of the first-stage absorption tower.
2. The treatment system for treating the reaction tail gas of the N-o-tolylthiourea as claimed in claim 1, wherein: butterfly valves are arranged at the first-stage absorption tower gas-phase outlet (13), the second-stage absorption tower gas-phase outlet (23) and the third-stage absorption tower gas-phase outlet (33).
3. The treatment system for treating the reaction tail gas of the N-o-tolylthiourea as claimed in claim 1, wherein: the pH value in the primary absorption tower body (11) is 8-9.
4. The system for treating the tail gas generated in the reaction of N-o-tolylthiourea according to claim 1, wherein: the pH value in the secondary absorption tower body (21) is 11-12.
5. The treatment system for treating the reaction tail gas of the N-o-tolylthiourea as claimed in claim 1, wherein: the pH value in the three-stage absorption tower body (31) is 11-12.
6. The treatment system for treating the reaction tail gas of the N-o-tolylthiourea as claimed in claim 1, wherein: alkali liquor is contained in the first-stage absorption tower storage tank (14), the second-stage absorption tower storage tank (24) and the third-stage absorption tower storage tank (34).
7. The treatment system for treating the reaction tail gas of the N-o-tolylthiourea as claimed in claim 1, wherein: the primary absorption tower wind pressure gauge (19), the secondary absorption tower wind pressure gauge (29) and the tertiary absorption tower wind pressure gauge (39) are all online wind pressure gauges.
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| CN202122416924.8U CN216537771U (en) | 2021-10-08 | 2021-10-08 | Processing system for processing N-o-tolylthiourea reaction tail gas |
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