Acid gas absorption system in bromine production

Abstract

The utility model relates to an acid gas absorption system in bromine production, and belongs to the technical field of inorganic chemical equipment. The system comprises an acid gas absorption tower, an alkali tank, an acid gas recovery tank and a circulating pump, the acid gas absorption tower and the acid gas recovery tank are connected with a gas inlet pipe A and a gas inlet pipe B respectively, a spraying pipe is arranged at the top of the acid gas absorption tower and connected with the alkali tank through the circulating pump, and the bottom of the acid gas absorption tower is connected with the alkali tank through a pipeline. The acid gas absorption device is simple in structure and convenient to operate, the technological process can be adjusted according to different acid gas conditions, and the working efficiency is improved while sufficient acid gas absorption is guaranteed.

Description

Technical Field

[0001] The utility model relates to an acid gas absorption system in bromine production, belonging to the technical field of inorganic chemical equipment. Background Art

[0002] The process flow of bromine extraction from seawater is becoming more and more mature. With continuous technological development, the technology of bromine extraction from seawater has made great progress. The research and development in equipment and process support the continuous progress of the technology of bromine extraction from seawater.

[0003] At present, most production enterprises adopt the acid air blowing method. The main process is to use hydrochloric acid or sulfuric acid to adjust the pH of seawater or underground brine with low bromine content to about 3, introduce chlorine gas, oxidize bromide ions into bromine molecules, blow out molecular bromine with air, and then use sulfur dioxide and water to absorb bromine molecules and convert them into hydrobromic acid to increase the bromine content to 30-100g / L, and then obtain bromine products through distillation and separation. In the actual production process, the by-product hydrochloric acid or sulfuric acid in the chlor-alkali process is mostly used to acidify brine, which will produce acidic mixed gas. The main components of acid gas are chlorine, hydrogen, hydrogen chloride, and other organic acid volatiles, so how to deal with acid gas in the production process is currently an urgent problem to be solved. Summary of the invention

[0004] In view of the deficiencies of the prior art, the utility model provides an acid gas absorption system in bromine production, which has a simple structure and is easy to operate. The process can be adjusted according to different acid gas conditions to ensure sufficient absorption of the acid gas while improving work efficiency.

[0005] The technical solution of the utility model is as follows:

[0006] An acid gas absorption system in bromine production comprises an acid gas absorption tower, an alkali tank, an acid gas recovery tank and a circulation pump, wherein the acid gas absorption tower and the acid gas recovery tank are respectively connected to an air inlet pipe A and an air inlet pipe B, a spray pipe is arranged on the top of the acid gas absorption tower, the spray pipe is connected to the alkali tank through the circulation pump, and the bottom of the acid gas absorption tower is connected to the alkali tank through a pipeline.

[0007] Preferably, according to the utility model, the liquid outlet of the circulation pump is connected to the top of the alkali tank through a detection tube, and a pH detector is provided on the detection tube for detecting the pH value of the liquid.

[0008] Preferably, according to the utility model, the liquid outlet of the circulation pump is connected to a waste liquid pool through a waste liquid pipeline, and the acid gas recovery tank is connected to a waste acid tank.

[0009] According to the preferred embodiment of the present invention, the air inlet pipe B extends to the bottom of the acid gas recovery tank to ensure that the acid gas is fully contacted and absorbed by the fresh water.

[0010] According to the preferred embodiment of the utility model, both the air inlet pipe A and the air inlet pipe B are connected to the outside of the air through a one-way valve to ensure the balance of air pressure in the tank.

[0011] Valves are provided on the air inlet pipe A, air inlet pipe B, waste liquid pipeline and each liquid channel to control the flow of liquid.

[0012] When in use, fresh water is provided in the acid gas recovery tank, and the air inlet pipe A and the air inlet pipe B are connected to the storage tanks for acid gas generated in the production process of bromine products. If hydrochloric acid is mainly used in the production process, the acid gas generated mainly contains hydrogen chloride. The air inlet pipe B is opened, and the acid gas enters the acid gas recovery tank and dissolves in fresh water. After a large amount of acid gas is dissolved in the fresh water, the acid water flows into the waste acid tank and is supplied to the downstream for use;

[0013] When more sulfuric acid or organic acid is used in production, the air inlet pipe A is opened, the circulation pump is turned on, and the alkali liquid in the alkali tank is pumped into the spray pipe at the top of the acid gas absorption tower. After the acid gas enters the acid gas absorption tower, it contacts and reacts with the sprayed alkali liquid, falls to the bottom of the acid gas absorption tower and flows back to the alkali tank. The pH value of the liquid in the circulation pipeline is detected by a pH detector. When the alkali liquid tends to be neutral, the neutralized wastewater is transported to the waste liquid pool.

[0014] During the absorption process, the alkali tank is supplemented with alkali solution through an external transfer pump, and the acid gas recovery tank is supplemented with fresh water through an external fresh water pump.

[0015] The beneficial effects of the utility model are:

[0016] 1. The utility model provides an acid gas absorption system in bromine production, which has a simple structure and is easy to operate. The process can be adjusted according to different acid gas conditions to ensure that the acid gas is fully absorbed while improving work efficiency.

[0017] 2. The liquid outlet of the circulation pump of the utility model is connected to the top of the alkali tank through a detection tube. A pH detector is provided on the detection tube to detect the pH value of the liquid. When the alkali solution tends to be neutral, the neutralized wastewater is transported to the waste liquid pool to ensure the absorption effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Among them: 1. Acid gas absorption tower; 2. Alkali tank; 3. Acid gas recovery tank; 4. Circulation pump; 5. Inlet pipe A; 6. Inlet pipe B; 7. Waste acid tank; 8. One-way valve; 9. Transfer pump; 10. Fresh water pump; 11. Detection tube; 12. Waste liquid pipeline; 13. Waste liquid pool; 14. Spray pipe; 15. PH detector. DETAILED DESCRIPTION

[0020] The present invention will be further described below through embodiments and in conjunction with the accompanying drawings, but is not limited thereto.

[0021] Embodiment 1:

[0022] like Figure 1 As shown, this embodiment provides an acid gas absorption system for bromine production, including an acid gas absorption tower 1, an alkali tank 2, an acid gas recovery tank 3 and a circulation pump 4, wherein the acid gas absorption tower 1 and the acid gas recovery tank 3 are respectively connected to an air inlet pipe A5 and an air inlet pipe B6, a spray pipe 14 is arranged on the top of the acid gas absorption tower 1, the spray pipe 14 is connected to the alkali tank 2 through the circulation pump 4, and the bottom of the acid gas absorption tower 1 is connected to the alkali tank 2 through a pipeline.

[0023] The liquid outlet of the circulation pump 4 is connected to the top of the alkali tank 2 through a detection tube 11, and a pH detector 15 is provided on the detection tube 11 for detecting the pH value of the liquid.

[0024] The liquid outlet of the circulation pump 4 is connected to a waste liquid tank 13 through a waste liquid pipeline 12 , and the acid gas recovery tank 3 is connected to a waste acid tank 7 .

[0025] The air inlet pipe B6 extends to the bottom of the acid gas recovery tank 3 to ensure that the acid gas is fully contacted and absorbed by the fresh water.

[0026] Both the air inlet pipe A5 and the air inlet pipe B6 are connected to the outside of the air through the one-way valve 8 to ensure the balance of air pressure in the tank.

[0027] Valves are provided on the air inlet pipe A, air inlet pipe B, waste liquid pipeline and each liquid channel to control the flow of liquid.

[0028] When in use, fresh water is provided in the acid gas recovery tank, and the air inlet pipe A and the air inlet pipe B are connected to the storage tanks for acid gas generated in the production process of bromine products. If hydrochloric acid is mainly used in the production process, the acid gas generated mainly contains hydrogen chloride. The air inlet pipe B is opened, and the acid gas enters the acid gas recovery tank and dissolves in fresh water. After a large amount of acid gas is dissolved in the fresh water, the acid water flows into the waste acid tank and is supplied to the downstream for use;

[0029] When more sulfuric acid or organic acid is used in production, the air inlet pipe A is opened, the circulation pump is turned on, and the alkali liquid in the alkali tank is pumped into the spray pipe at the top of the acid gas absorption tower. After the acid gas enters the acid gas absorption tower, it contacts and reacts with the sprayed alkali liquid, falls to the bottom of the acid gas absorption tower and flows back to the alkali tank. The pH value of the liquid in the circulation pipeline is detected by a pH detector. When the alkali liquid tends to be neutral, the neutralized wastewater is transported to the waste liquid pool.

[0030] During the absorption process, the alkali tank 2 is externally supplemented with alkali solution through the material transfer pump 9, and the acid gas recovery tank 3 is externally supplemented with fresh water through the fresh water pump 10.

[0031] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other at will.

Claims

1. An acid gas absorption system in bromine production, characterized in that: It includes an acid gas absorption tower, an alkali tank, an acid gas recovery tank and a circulation pump, wherein the acid gas absorption tower and the acid gas recovery tank are connected to an air inlet pipe A and an air inlet pipe B respectively, a spray pipe is arranged on the top of the acid gas absorption tower, the spray pipe is connected to the alkali tank through a circulation pump, and the bottom of the acid gas absorption tower is connected to the alkali tank through a pipeline.

2. The acid gas absorption system in bromine production according to claim 1, characterized in that: The liquid outlet of the circulation pump is connected to the top of the alkali tank through a detection tube, and a pH detector is arranged on the detection tube.

3. The acid gas absorption system in bromine production according to claim 1, characterized in that: The liquid outlet of the circulation pump is connected to a waste liquid pool through a waste liquid pipeline, and the acid gas recovery tank is connected to a waste acid tank.

4. The acid gas absorption system in bromine production according to claim 1, characterized in that: The air inlet pipe B extends to the bottom of the acid gas recovery tank.

5. The acid gas absorption system in bromine production according to claim 1, characterized in that: Both the air inlet pipe A and the air inlet pipe B are connected to the outside of the air through a one-way valve.

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