Tail gas treatment device in aluminum trichloride production

Abstract

The utility model belongs to the technical field of chemical equipment, and discloses a tail gas treatment device in aluminum trichloride production, which comprises a reaction furnace, a main catcher, an auxiliary catcher, a first absorption tower and a second absorption tower which are sequentially communicated through pipelines and valves, solid material outlets of the main catcher and the auxiliary catcher are communicated with an aluminum trichloride collecting tank; liquid outlets of the first absorption tower and the second absorption tower are respectively communicated with regeneration towers, the regeneration towers are communicated to a ferrous chloride solution storage tank, and the ferrous chloride solution storage tank is respectively communicated to the first absorption tower and the second absorption tower through a pipeline and a circulating pump; the second absorption tower is provided with a tail gas discharge port. The device disclosed by the utility model is simple, convenient to operate, good in treatment effect, stable in performance of obtained products and high in application value.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical equipment, and particularly relates to a tail gas treatment device in the production of aluminum trichloride. Background Art

[0002] In the existing production process, chlorobenzene is generally used as a solvent and aluminum trichloride is used as a catalyst in the production of 2-ethylanthraquinone. Therefore, enterprises that mainly produce 2-ethylanthraquinone generally produce most of the production raw material aluminum trichloride by themselves and incidentally produce some corresponding by-products, such as magnesium sulfate, sodium hypochlorite, etc. When producing these products, a large amount of chlorine gas is used, or chlorine gas is generated in the intermediate products. Chlorine gas is also generated during the sampling and detection of the product production process and the detection process. Most of the chlorine gas is consumed by producing sodium hypochlorite through alkali solution absorption. The remaining tail chlorine is also treated by producing sodium hypochlorite through alkali solution absorption, but the obtained sodium hypochlorite is not stable and will decompose to generate free chlorine during the packaging process, and hydrochloric acid or chlorine gas will also be formed, reducing the product yield and endangering environmental safety. Therefore, this treatment method cannot solve the tail chlorine problem well. Summary of the Invention

[0003] The technical problem to be solved by the utility model is: to provide a tail gas treatment device in the production of aluminum trichloride, which treats the tail chlorine generated in each process of the chemical production process with iron powder. The equipment is simple, the operation is convenient, the treatment effect is good, the obtained product has stable performance and high application value.

[0004] To solve the above technical problem, the technical solution of the utility model is:

[0005] A tail gas treatment device in the production of aluminum trichloride includes a reaction furnace, a main trap, a secondary trap, a first absorption tower, and a second absorption tower that are sequentially connected through pipelines and valves; the solid material outlets of the main trap and the secondary trap are both connected to an aluminum trichloride collection tank; the liquid material outlets of the first absorption tower and the second absorption tower are respectively connected to a regeneration tower, and the regeneration towers are both connected to a ferrous chloride solution storage tank. The ferrous chloride solution storage tank is connected to the first absorption tower and the second absorption tower through pipelines and circulation pumps respectively; the second absorption tower is provided with a tail gas discharge port.

[0006] Preferably, the reaction furnace is provided with a chlorine gas inlet and an aluminum ingot inlet.

[0007] Preferably, the aluminum trichloride collection tank is also connected to a packaging device. The obtained aluminum trichloride is packaged and temporarily stored.

[0008] Preferably, the regeneration tower is provided with an iron powder inlet, and the iron powder inlet is connected to an iron powder storage tank. Iron powder is input to react with ferric chloride to obtain ferrous chloride solution for chlorine gas absorption.

[0009] Preferably, a water inlet is provided on the ferrous chloride solution storage tank, and the water inlet is connected to a water storage tank. The concentration of the ferrous chloride solution is adjusted to 10% by mass with water for chlorine absorption.

[0010] Preferably, the ferrous chloride solution storage tank is also connected to a polymerization reactor. The ferrous chloride solution with a mass concentration of 40% - 50% accumulated to a certain amount is transported to the polymerization reactor to generate polymeric iron oxide.

[0011] Preferably, the tail gas discharge port of the second absorption tower is connected to a chimney through a pipeline.

[0012] Due to the adoption of the above technical solution, the beneficial effects of the present utility model are as follows:

[0013] 1. The present utility model uses an iron preparation to absorb and treat chlorine in the tail gas of aluminum trichloride production. The iron preparation can be recycled and regenerated. The ferrous chloride generated after absorbing chlorine can be further prepared into polymeric ferric chloride, which is used as a flocculant and is widely applied in the fields of water supply and drainage, bringing economic benefits to enterprises;

[0014] 2. The present utility model overcomes the defect that in the prior art, lye is used to absorb and produce sodium hypochlorite, and the obtained sodium hypochlorite is unstable and will decompose into chlorine. The obtained product has stable performance and can be widely applied.

[0015] In summary, the equipment of the present utility model is simple, easy to operate, has good treatment effect, the obtained product has stable performance, and has high application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0017] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0018] Among them, 1. Reaction furnace; 2. Main trap; 3. Auxiliary trap; 4. First absorption tower; 5. Second absorption tower; 6. Aluminum trichloride collection tank; 7. Regeneration tower; 8. Ferrous chloride solution storage tank; 9. Circulation pump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present utility model will be further elaborated below in conjunction with the drawings and embodiments.

[0020] Such as Figure 1As shown in the figure, the utility model is a tail gas treatment device in the production of aluminum trichloride, which includes a reaction furnace 1, a main trap 2, a secondary trap 3, a first absorption tower 4, and a second absorption tower 5 that are sequentially connected through pipelines (not marked) and valves (not marked); the solid material outlets (not marked) of the main trap 2 and the secondary trap 3 are both connected to an aluminum trichloride collection tank 6; the liquid material outlets (not marked) of the first absorption tower 4 and the second absorption tower 5 are respectively connected to a regeneration tower 7, and the regeneration tower 7 is connected to a ferrous dichloride solution storage tank 8. The ferrous dichloride solution storage tank 8 is connected to the first absorption tower 4 and the second absorption tower 5 respectively through pipelines and a circulation pump 9; the second absorption tower 5 is provided with a tail gas discharge port (not marked).

[0021] During actual production, the liquid chlorine in the liquid chlorine storage tank is vaporized through a liquid chlorine vaporizer and then enters the chlorine buffer tank. The aluminum ingots are transported into the reaction furnace 1 to be melted, and then chlorine gas is introduced from the chlorine buffer tank to react with the liquid aluminum. The generated aluminum trichloride is sequentially transported to the main trap 2 and the secondary trap 3 through a sublimation pipeline, and the solid aluminum trichloride is collected into the aluminum trichloride collection tank 6 after condensation in the two traps, and then the finished product of aluminum trichloride is obtained through packaging; while the tail gas from the reaction enters the first absorption tower 4 and the second absorption tower 5 sequentially from the secondary trap 3, reacts with the ferrous dichloride solution in the first absorption tower 4 and the second absorption tower 5 to obtain ferric trichloride, and the remaining tail gas after removing chlorine gas is transported to the chimney through the tail gas discharge port and pipeline of the second absorption tower 5 for discharge; the ferric trichloride is transported to the regeneration tower to react with iron powder to regenerate ferrous dichloride and enter the ferrous dichloride solution storage tank 8. After a period of circulation, the solution concentration and quantity of the ferrous dichloride solution will increase. When it accumulates to a certain amount (the solution concentration reaches 40% - 50% mass concentration and the storage tank is almost full), part of the ferrous dichloride solution is transported to a polymerization reactor to generate polymeric iron oxide for sale as a commodity, and the remaining part of the ferrous dichloride solution is diluted with water to 10% mass concentration and continues to be used in circulation.

[0022] It should be understood that these embodiments are only used to illustrate the utility model and not to limit the scope of the utility model. In addition, it should be understood that after reading the content taught by the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. An exhaust gas treatment device in the production of aluminum trichloride, characterized in that: It includes a reaction furnace, a main trap, a secondary trap, a first absorption tower and a second absorption tower that are connected in sequence through pipelines and valves; the solid material outlets of the main trap and the secondary trap are both connected to an aluminum trichloride collection tank; the liquid material outlets of the first absorption tower and the second absorption tower are respectively connected to a regeneration tower, and the regeneration towers are both connected to a ferrous dichloride solution storage tank, and the ferrous dichloride solution storage tank is connected to the first absorption tower and the second absorption tower respectively through pipelines and circulation pumps; the second absorption tower is provided with a tail gas discharge port.

2. The tail gas treatment device in the production of aluminum trichloride according to claim 1, wherein: The reaction furnace is provided with a chlorine gas inlet and an aluminum ingot inlet.

3. The tail gas treatment device in the production of aluminum trichloride according to claim 1, wherein: The aluminum trichloride collection tank is also connected to a packaging device.

4. The tail gas treatment device in the production of aluminum trichloride according to claim 1, wherein: The regeneration tower is provided with an iron powder inlet, and the iron powder inlet is connected to an iron powder storage tank.

5. The tail gas treatment device in the production of aluminum trichloride according to claim 1, characterized in that: The ferrous dichloride solution storage tank is provided with a water inlet, and the water inlet is connected to a water storage tank.

6. The tail gas treatment device in the production of aluminum trichloride according to claim 1, characterized in that: The ferrous dichloride solution storage tank is also connected to a polymerization reactor.

7. The tail gas treatment device in the production of aluminum trichloride according to claim 1, characterized in that: The tail gas discharge port of the second absorption tower is connected to a chimney through a pipeline.

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