Storage tank for separating trace chlorobenzene in hydrochloric acid

Abstract

The utility model belongs to the technical field of separation, and particularly relates to a storage tank for separating trace chlorobenzene in hydrochloric acid, which comprises a storage tank body, a liquid receiving tank is connected below the storage tank body, a chlorobenzene drainage port is arranged at the bottom of the liquid receiving tank, an inner cavity of the storage tank body is communicated with an inner cavity of the liquid receiving tank, and a feed port is arranged at the top of the storage tank body. An inserting pipe is arranged in the feeding port, the bottom of the inserting pipe extends to the bottom of an inner cavity of the storage tank body, a baffle is vertically arranged in the storage tank body, the lower end and the two sides of the baffle are connected with the inner wall of the storage tank body, and a gap is reserved between the upper end of the baffle and the top of the storage tank body; the liquid receiving groove and the inserting pipe are located on the same side of the baffle, and a hydrochloric acid discharging opening is formed in the side, away from the liquid receiving groove, of the baffle and located in the bottom of the storage tank body. The storage tank can effectively separate out trace chlorobenzene in hydrochloric acid, the purity of hydrochloric acid is improved, and efficient separation is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of separation technology, and in particular relates to a storage tank for separating trace amounts of chlorobenzene from hydrochloric acid. Background Technology

[0002] In the production of isocyanates, chlorobenzene is often used as a solvent. Hydrogen chloride is a byproduct of isocyanate production and needs to be absorbed by water to form hydrochloric acid for storage. However, during this process, the hydrogen chloride gas inevitably comes into contact with chlorobenzene, resulting in trace amounts of chlorobenzene in the hydrochloric acid solution. How to efficiently and economically separate chlorobenzene from hydrochloric acid is key to improving its quality. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a storage tank for separating trace amounts of chlorobenzene from hydrochloric acid.

[0004] To achieve the above objectives, the technical solution adopted is:

[0005] A storage tank for separating trace amounts of chlorobenzene from hydrochloric acid includes a tank body with a receiving tank connected to the bottom. The receiving tank has a chlorobenzene drain outlet at its bottom. The inner cavity of the tank body is connected to the inner cavity of the receiving tank. The top of the tank body has a feed inlet with an insertion tube inside. The bottom of the insertion tube extends to the bottom of the inner cavity of the tank body. The tank body has a baffle that is vertically arranged. The lower end and both sides of the baffle are connected to the inner wall of the tank body. A gap is left between the upper end of the baffle and the top of the tank body. The receiving tank and the insertion tube are located on the same side of the baffle. The side of the baffle away from the receiving tank has a hydrochloric acid outlet located at the bottom of the tank body.

[0006] The beneficial effects of adopting the above technical solution are as follows: by setting up the baffle, the inside of the storage tank is divided into two areas. After hydrochloric acid containing trace amounts of chlorobenzene enters the storage tank body through the insertion pipe of the inlet, it will accumulate on one side of the storage tank due to the obstruction of the baffle. Since chlorobenzene has a high density, it will deposit at the bottom of the baffle side of the storage tank, enter the liquid receiving tank, and be discharged from the chlorobenzene drain port at the bottom of the liquid receiving tank. Hydrochloric acid will accumulate on top of the chlorobenzene, forming a stratification with the chlorobenzene below. When the liquid level on the baffle side of the storage tank body exceeds the height of the baffle, the pure hydrochloric acid will overflow into the space on the other side of the baffle and be discharged through the hydrochloric acid outlet at the bottom of the other side.

[0007] Preferably, the insertion tube is provided with an inclined guide slope below it, and the lower end of the guide slope is connected to the top of the liquid receiving tank.

[0008] Preferably, the upper end of the guide slope is connected to the baffle.

[0009] Preferably, the guide slope is made of a hydrophobic material or the surface of the guide slope is coated with a hydrophobic material.

[0010] The beneficial effects of adopting the above-mentioned preferred technical solution are as follows: the guide slope can guide the inflowing liquid, reduce the splashing and diffusion of the liquid in the storage tank, and improve the separation efficiency. The guide slope is made of hydrophobic material or the slope surface of the guide slope is coated with hydrophobic material, specifically superhydrophobic titanium dioxide (TiO2) nanofiber material, polydimethylsiloxane (PDMS)@silica (SiO2) composite material, superhydrophobic polytetrafluoroethylene (PTFE) nanoparticle composite material, etc., which can enable the guide slope to adsorb chlorobenzene and reduce the adhesion of hydrochloric acid on the slope surface, thereby promoting the aggregation of chlorobenzene microdroplets into large droplets, accelerating the stratification of chlorobenzene and hydrochloric acid, and improving the separation efficiency.

[0011] Preferably, the liquid receiving tank is provided with a sight glass.

[0012] The advantages of adopting the above-mentioned preferred technical solution are as follows: the sight glass can monitor the liquid state in the receiving tank in real time, making it convenient for operators to observe the collection of chlorobenzene, intuitively understand the liquid stratification, and facilitate timely discharge of chlorobenzene.

[0013] Preferably, the storage tank body is provided with an exhaust port, which is located at the top of the storage tank body.

[0014] The beneficial effect of adopting the above-mentioned preferred technical solution is that the vent can balance the pressure inside the storage tank and prevent safety problems caused by excessive pressure.

[0015] Preferably, the storage tank body is provided with a level gauge, which is located on one side of the storage tank body, and the level gauge includes an upper level gauge and a lower level gauge arranged vertically.

[0016] The beneficial effects of adopting the above-mentioned preferred technical solution are as follows: the level gauge can monitor the liquid level in the storage tank in real time, ensuring that the operator can understand the liquid filling status in a timely manner, so that the liquid level in the storage tank is always around the highest point of the baffle, preventing liquid overflow and ensuring operational safety.

[0017] Preferably, the storage tank body is a horizontal storage tank.

[0018] Preferably, the tank body is made of fiberglass or fiberglass lined with fluoropolymer.

[0019] The beneficial effects of adopting the above-mentioned preferred technical solution are that fiberglass or fiberglass-lined fluoropolymer has good corrosion resistance and can resist corrosion from hydrochloric acid and chlorobenzene.

[0020] Preferably, valves are installed at the chlorobenzene drain outlet and the hydrochloric acid outlet.

[0021] The beneficial effect of adopting the above-mentioned preferred technical solution is that the valve can accurately control the drainage process and ensure the smooth discharge of liquid.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows: This storage tank can effectively separate trace amounts of chlorobenzene from hydrochloric acid, improve the purity of hydrochloric acid, since chlorobenzene is heavier than hydrochloric acid. The liquid receiving tank on one side of the baffle is used for collecting chlorobenzene, and the other side of the baffle is used for collecting hydrochloric acid, thus achieving efficient separation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a storage tank for separating trace amounts of chlorobenzene from hydrochloric acid according to the present invention.

[0024] Explanation of reference numerals in the attached diagram: 1. Insertion tube; 2. Liquid receiving tank; 3. Baffle; 4. Feed inlet; 5. Vent; 6. Chlorobenzene drain outlet; 7. Hydrochloric acid outlet; 8. Upper level gauge; 9. Lower level gauge; 10. Guide slope; 11. Tank body. Detailed Implementation

[0025] The present invention will be described below with reference to examples. The examples are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0026] In the description of this utility model, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] refer to Figure 1A storage tank for separating trace amounts of chlorobenzene from hydrochloric acid includes a tank body 11, a receiving tank 2 connected to the bottom of the tank body 11, a chlorobenzene drain port 6 at the bottom of the receiving tank 2, an inner cavity of the tank body 11 communicating with the inner cavity of the receiving tank 2, a feed inlet 4 at the top of the tank body 11, an insertion tube 1 inside the feed inlet 4, the bottom of the insertion tube 1 extending to the bottom of the inner cavity of the tank body 11, a baffle 3 inside the tank body 11, the baffle 3 being vertically arranged, the lower end and both sides of the baffle 3 being connected to the inner wall of the tank body 11, and a gap being left between the upper end of the baffle 3 and the top of the tank body 11, the receiving tank 2 and the insertion tube 1 being located on the same side of the baffle 3, and a hydrochloric acid outlet 7 being located on the side of the baffle 3 away from the receiving tank 2, the hydrochloric acid outlet 7 being located at the bottom of the tank body 11.

[0029] In an optional embodiment, an inclined guide slope 10 is provided below the insertion tube 1, and the lower end of the guide slope 10 is connected to the top end of the liquid receiving tank 2.

[0030] In an optional embodiment, the upper end of the guide slope 10 is connected to the baffle 3.

[0031] In an optional embodiment, the guide slope 10 is made of a hydrophobic material or the slope surface of the guide slope 10 is coated with a hydrophobic material.

[0032] In this embodiment, the liquid receiving tank 2 is equipped with a sight glass.

[0033] In this embodiment, the storage tank body 11 is provided with an exhaust port 5, which is located at the top of the storage tank body 11.

[0034] In an optional embodiment, the tank body 11 is provided with a level gauge.

[0035] In this embodiment, the level gauge is located on one side of the tank body 11, and the level gauge includes an upper level gauge 8 and a lower level gauge 9 arranged vertically.

[0036] In this embodiment, the storage tank body 11 is a horizontal storage tank.

[0037] In this embodiment, the tank body 11 is made of fiberglass or fiberglass lined with fluoropolymer.

[0038] In this embodiment, valves are installed at the chlorobenzene discharge port 6 and the hydrochloric acid discharge port 7.

[0039] During operation, hydrochloric acid containing trace amounts of chlorobenzene enters the storage tank body 11 through the insertion pipe 1 of the feed port 4. The bottom of the insertion tube 1 extends to the bottom of the inner cavity of the storage tank body 11, ensuring that the liquid can be evenly distributed. The guide slope 10 below the insertion tube 1 promotes the aggregation of chlorobenzene droplets into large droplets, guiding the chlorobenzene to the liquid receiving tank 2 on the left side of the insertion tube 1 inside the storage tank body 11, accelerating the stratification with hydrochloric acid. The liquid state in the liquid receiving tank 2 can be monitored in real time through the sight glass to observe the collection of chlorobenzene. The valve is opened to allow the chlorobenzene to be discharged from the chlorobenzene drain port 6 at the bottom of the liquid receiving tank 2. The baffle 3 divides the inside of the storage tank into two areas. The liquid receiving tank 2 and the insertion tube 1 are located on the left side of the baffle 3. The stratified liquid accumulates on the left side of the storage tank under the obstruction of the baffle 3. As the liquid continues to enter, the liquid level on the left side of the storage tank gradually rises. When the liquid level on the left side of the baffle 3 inside the storage tank body 11 exceeds the height of the baffle 3, the pure hydrochloric acid will overflow into the space on the right side of the storage tank. The pure hydrochloric acid overflowing into the right side of the storage tank is discharged through the hydrochloric acid outlet 7 below the right side of the baffle 3.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A storage tank for separating trace amounts of chlorobenzene from hydrochloric acid, characterized in that, The system includes a storage tank body with a liquid receiving tank connected to its lower part. The bottom of the liquid receiving tank has a chlorobenzene drain outlet. The inner cavity of the storage tank body is connected to the inner cavity of the liquid receiving tank. The top of the storage tank body has a feed inlet with an insertion tube inside. The bottom of the insertion tube extends to the bottom of the inner cavity of the storage tank body. The storage tank body has a baffle plate, which is vertically arranged. The lower end and both sides of the baffle plate are connected to the inner wall of the storage tank body. A gap is left between the upper end of the baffle plate and the top of the storage tank body. The liquid receiving tank and the insertion tube are located on the same side of the baffle plate. The side of the baffle plate away from the liquid receiving tank has a hydrochloric acid outlet, which is located at the bottom of the storage tank body.

2. The tank for separating trace amounts of chlorobenzene in hydrochloric acid according to claim 1, wherein The insertion tube is provided with an inclined guide slope below it, and the lower end of the guide slope is connected to the top of the liquid receiving tank.

3. The tank for separating trace amounts of chlorobenzene in hydrochloric acid according to claim 2, wherein The upper end of the guide slope is connected to the baffle.

4. The storage tank for separating trace amounts of chlorobenzene from hydrochloric acid according to claim 3, characterized in that, The guide slope is made of a hydrophobic material or the surface of the guide slope is coated with a hydrophobic material.

5. The storage tank for separating trace amounts of chlorobenzene from hydrochloric acid according to claim 4, characterized in that, The liquid receiving tank is equipped with a sight glass.

6. The storage tank for separating trace amounts of chlorobenzene from hydrochloric acid according to claim 1, characterized in that, The storage tank body is provided with an exhaust port, which is located at the top of the storage tank body.

7. The storage tank for separating trace amounts of chlorobenzene from hydrochloric acid according to claim 1, characterized in that, The storage tank is equipped with a level gauge.

8. The tank for separating trace amounts of chlorobenzene in hydrochloric acid according to claim 1, wherein The storage tank body is a horizontal storage tank.

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