Material recovery device of sulfamic acid byproduct dilute sulphuric acid system

Abstract

The material recovery device of the sulfamic acid byproduct dilute sulphuric acid system comprises a dilute sulphuric acid storage tank, and further comprises a filtering tank and a vacuum tank, a liquid discharge pipe is arranged at the bottom of the dilute sulphuric acid storage tank, the liquid discharge pipe is connected to the filtering tank, a first liquid return pipe is arranged at the bottom of the filtering tank, and the first liquid return pipe is connected to the dilute sulphuric acid storage tank to form a circulation pipeline; a liquid suction pipe is arranged in the dilute sulfuric acid storage tank and connected to the vacuum tank, and a second liquid return pipe is arranged at the bottom of the vacuum tank and connected to the dilute sulfuric acid storage tank to form a circulation pipeline. By adopting the structure, coarse and fine crystallization parts are respectively separated through the filtering tank and the vacuum tank, so that the problem of blockage of a delivery pipeline caused by sedimentation of a sulfamic acid material in a dilute sulfuric acid storage tank can be solved.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, specifically a material recovery device for an aminosulfonic acid byproduct dilute sulfuric acid system. Background Technology

[0002] In the preparation process of aminosulfonic acid based on the liquid-phase continuous synthesis method, the material after passing through the first and second reaction vessels of the synthesis reactor enters the dilution vessel. After adding a small amount of mother liquor to the material in the dilution vessel, it is cooled and then filtered through a vacuum drum. The filtrate is approximately 56% dilute sulfuric acid, and the filter media is crude aminosulfonic acid. Due to solubility limitations, some aminosulfonic acid product inevitably gets mixed into the 56% dilute sulfuric acid. The 56% dilute sulfuric acid solution is pumped into a dilute sulfuric acid settling tank by a dilute sulfuric acid pump, and then pumped into a dilute sulfuric acid storage tank for external delivery to customers. During long-term operation of the dilute sulfuric acid storage tank, the aminosulfonic acid material continues to settle to the bottom of the tank and crystallizes into large particles, which can cause blockage of the external delivery pipeline, reduce flow, and affect normal production operation. Manual cleaning is required to continue operation. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a material recovery device for a dilute sulfuric acid system that produces aminosulfonic acid byproducts, in order to solve the problem of blockage in the external pipeline caused by the settling of aminosulfonic acid material in the dilute sulfuric acid storage tank.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a material recovery device for a dilute sulfuric acid system for aminosulfonic acid by-products, including a dilute sulfuric acid storage tank, a filter tank and a vacuum tank. The bottom of the dilute sulfuric acid storage tank is provided with a drain pipe, which is connected to the filter tank. The bottom of the filter tank is provided with a first return pipe, which is connected to the dilute sulfuric acid storage tank and forms a circulation pipeline.

[0005] The dilute sulfuric acid storage tank is equipped with a suction pipe, which is connected to a vacuum tank. The bottom of the vacuum tank is equipped with a second return pipe, which is connected to the dilute sulfuric acid storage tank to form a circulation pipeline.

[0006] In a preferred embodiment, the dilute sulfuric acid storage tank is equipped with a vertical rotating pipe, and a stirring plate is provided at the lower part of the rotating pipe. The stirring plate is attached to the inner wall of the dilute sulfuric acid storage tank. A vertical suction pipe is installed inside the rotating pipe, and the suction pipe extends upward to the outside of the dilute sulfuric acid storage tank and is connected to the delivery pipe.

[0007] In a preferred embodiment, the rotating tube is equipped with a driven gear, the top of the dilute sulfuric acid storage tank is equipped with a motor, the motor drive shaft extends downward into the dilute sulfuric acid storage tank, the motor drive shaft is equipped with a driving gear, and the driving gear meshes with the driven gear.

[0008] In a preferred embodiment, the vacuum tank is provided with a filter inclined plate, and an opening is provided on the side wall of the vacuum tank at the lower end of the filter inclined plate. A sealing baffle is provided at the opening, and the sealing baffle is slidably installed through a baffle mounting groove on the outer wall of the vacuum tank.

[0009] The liquid delivery pipe extends into the vacuum tank and is located above the filter inclined plate.

[0010] In a preferred embodiment, the top of the vacuum tank is provided with a negative pressure pipe, which is connected to a negative pressure device;

[0011] The vacuum tank is also equipped with a vent pipe at the top.

[0012] In a preferred embodiment, the filter tank is provided with a funnel-shaped filter cloth, which has a mesh structure. A cylindrical section is provided at the bottom of the funnel-shaped filter cloth, and the bottom surface of the cylindrical section is the bottom filter cloth. The drain pipe extends into the filter tank and is located above the funnel-shaped filter cloth.

[0013] In a preferred embodiment, the filter tank is further provided with a spiral lifting mechanism, which is set vertically through the top of the filter tank. The spiral lifting blades inside the spiral lifting mechanism extend into the cylinder section, and the discharge pipe of the spiral lifting mechanism is located outside the top of the filter tank.

[0014] In a preferred embodiment, the drain pipe is provided with a branch pipe, which is a dilute sulfuric acid outlet pipe;

[0015] The drain pipe is equipped with a first control valve, the first return pipe is equipped with a return pump, the second return pipe is equipped with a second control valve, and the dilute sulfuric acid outlet pipe is equipped with a third control valve.

[0016] The material recovery device for a dilute sulfuric acid system produced as a byproduct of aminosulfonic acid provided by this utility model has the following beneficial effects by adopting the above-described structure:

[0017] (1) By setting up a filter tank and a vacuum tank, the solid substances in dilute sulfuric acid are effectively separated. The funnel-shaped filter cloth in the filter tank can intercept most of the solid impurities, while the vacuum tank further finely filters the liquid, improving the recovery rate and purity of the material.

[0018] (2) The stirring plate can agitate the settled crystallized part during the vacuum adsorption process in the vacuum tank, thereby improving the adsorption efficiency of the coarse crystallized part.

[0019] (3) The fine crystals can be effectively separated by the continuous circulation separation pipeline between the filter tank and the dilute sulfuric acid storage tank. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] Figure 1This is a schematic diagram of the overall structure of this utility model.

[0022] In the diagram: 1. Dilute sulfuric acid storage tank; 2. Filter tank; 3. Vacuum tank; 4. Drain pipe; 401. First control valve; 5. First return pipe; 501. Return pump; 6. Delivery pipe; 7. Second return pipe; 701. Second control valve; 8. Rotary pipe; 9. Stirring plate; 10. Suction pipe; 11. Driven gear; 12. Motor; 13. Driven gear; 14. Filter inclined plate; 15. Sealing baffle; 16. Baffle mounting groove; 17. Negative pressure pipe; 18. Vent pipe; 19. Bucket-shaped filter cloth; 20. Cylinder section; 21. Bottom filter cloth; 22. Spiral lifting mechanism; 221. Spiral lifting blade; 222. Discharge pipe; 23. Dilute sulfuric acid outlet pipe; 231. Third control valve. Detailed Implementation

[0023] like Figure 1 In the present invention, a material recovery device for a dilute sulfuric acid system byproduct of aminosulfonic acid includes a dilute sulfuric acid storage tank 1, a filter tank 2 and a vacuum tank 3. The bottom of the dilute sulfuric acid storage tank 1 is provided with a drain pipe 4, which is connected to the filter tank 2. The bottom of the filter tank 2 is provided with a first return pipe 5, which is connected to the dilute sulfuric acid storage tank 1 and forms a circulation pipeline.

[0024] The dilute sulfuric acid storage tank 1 is equipped with a suction pipe 10, which is connected to a vacuum tank 3. The bottom of the vacuum tank 3 is equipped with a second return pipe 7, which is connected to the dilute sulfuric acid storage tank 1 to form a circulation pipeline.

[0025] In a preferred embodiment, the dilute sulfuric acid storage tank 1 is provided with a vertical rotating pipe 8, and a stirring plate 9 is provided at the lower part of the rotating pipe 8. The stirring plate 9 is attached to the inner wall of the dilute sulfuric acid storage tank 1. A vertical suction pipe 10 is inserted inside the rotating pipe 8. The suction pipe 10 extends upward to the outside of the dilute sulfuric acid storage tank 1 and is connected to the delivery pipe 6.

[0026] In a preferred embodiment, the rotating pipe 8 is provided with a driven gear 11, the top of the dilute sulfuric acid storage tank 1 is provided with a motor 12, the motor 12 drives the shaft downward into the dilute sulfuric acid storage tank 1, and the motor 12 drives the shaft with a driving gear 13, which meshes with the driven gear 11.

[0027] In a preferred embodiment, the vacuum tank 3 is provided with a filter inclined plate 14, and the lower end of the filter inclined plate 14 is provided with an opening on the side wall of the vacuum tank 3. A sealing baffle 15 is provided at the opening, and the sealing baffle 15 is slidably installed through the baffle mounting groove 16 on the outer wall of the vacuum tank 3.

[0028] The liquid delivery pipe 6 extends into the vacuum tank 3 and is located above the filter inclined plate 14.

[0029] In a preferred embodiment, the top of the vacuum tank 3 is provided with a negative pressure pipe 17, which is connected to a negative pressure device;

[0030] The top of the vacuum tank 3 is also equipped with a vent pipe 18.

[0031] In a preferred embodiment, the filter tank 2 is provided with a funnel-shaped filter cloth 19, which has a mesh structure. A cylindrical section 20 is provided at the conical bottom of the funnel-shaped filter cloth 19, and the bottom surface of the cylindrical section 20 is a bottom filter cloth 21. The drain pipe 4 extends into the filter tank 2 and is located above the funnel-shaped filter cloth 19.

[0032] In a preferred embodiment, the filter tank 2 is further provided with a spiral lifting mechanism 22, which is set vertically through the top of the filter tank 2. The spiral lifting blades 221 inside the spiral lifting mechanism 22 extend into the cylinder section 20, and the discharge pipe 222 of the spiral lifting mechanism 22 is located outside the top of the filter tank 2.

[0033] In a preferred embodiment, the drain pipe 4 is provided with a branch pipe, which is a dilute sulfuric acid outlet pipe 23;

[0034] The drain pipe 4 is equipped with a first control valve 401, the first return pipe 5 is equipped with a return pump 501, the second return pipe 7 is equipped with a second control valve 701, and the dilute sulfuric acid outlet pipe 23 is equipped with a third control valve 231.

[0035] The present invention discloses a material recovery device for a dilute sulfuric acid system that is a byproduct of aminosulfonic acid, for use during the crystallization and separation of aminosulfonic acid in a dilute sulfuric acid storage tank:

[0036] First, the coarse crystals are separated using vacuum tank 3, specifically as follows:

[0037] Turn on motor 12 to agitate the crystallization part at the bottom of dilute sulfuric acid storage tank 1 with stirring plate 9. Continue to draw negative pressure on vacuum tank 3 through negative pressure pipe 17 to generate negative pressure in liquid delivery pipe 6 and input the crystallized mixed dilute sulfuric acid into vacuum tank 3. The mixture is filtered on filter inclined plate 14 to separate the coarse crystallization part. After the separation operation is completed, open second control valve 701 to return the fine crystallization part with dilute sulfuric acid to dilute sulfuric acid storage tank 1.

[0038] The separated coarse crystals can be recovered by opening the sealing baffle 15.

[0039] After the separation of coarse crystals is completed, the first control valve 401 is opened, allowing the fine crystals to enter the filter tank 2 along with the dilute sulfuric acid. After being filtered by the funnel-shaped filter cloth 19, the fine crystals gather in the cylindrical section 20 along the funnel-shaped filter cloth 19. Under the action of the spiral lifting mechanism 22, they are output through the discharge pipe 22, while the liquid at the bottom of the filter tank 2 is returned to the dilute sulfuric acid storage tank 1 through the return pump 501.

[0040] This completes the separation of aminosulfonic acid crystals from dilute sulfuric acid.

[0041] When dilute sulfuric acid needs to be discharged, the dilute sulfuric acid can be discharged through the dilute sulfuric acid outlet pipe 23 by opening the third control valve 231.

Claims

1. A material recovery device for a dilute sulfuric acid system produced as a byproduct of aminosulfonic acid, comprising a dilute sulfuric acid storage tank (1), characterized in that: It also includes a filter tank (2) and a vacuum tank (3). The bottom of the dilute sulfuric acid storage tank (1) is provided with a drain pipe (4), which is connected to the filter tank (2). The bottom of the filter tank (2) is provided with a first return pipe (5), which is connected to the dilute sulfuric acid storage tank (1) and forms a circulation pipeline. The dilute sulfuric acid storage tank (1) is equipped with a suction pipe (10), which is connected to a vacuum tank (3). The bottom of the vacuum tank (3) is equipped with a second return pipe (7), which is connected to the dilute sulfuric acid storage tank (1) and forms a circulation pipeline.

2. The material recovery device for an aminosulfonic acid by-product dilute sulfuric acid system according to claim 1, characterized in that: The dilute sulfuric acid storage tank (1) is equipped with a vertical rotating pipe (8), and a stirring plate (9) is provided at the bottom of the rotating pipe (8). The stirring plate (9) is attached to the inner wall of the dilute sulfuric acid storage tank (1). A vertical suction pipe (10) is installed inside the rotating pipe (8). The suction pipe (10) extends upward to the outside of the dilute sulfuric acid storage tank (1) and is connected to the delivery pipe (6).

3. The material recovery device for an aminosulfonic acid by-product dilute sulfuric acid system according to claim 2, characterized in that: The rotating tube (8) is provided with a driven gear (11), and the top of the dilute sulfuric acid storage tank (1) is provided with a motor (12). The motor (12) drives the shaft downward into the dilute sulfuric acid storage tank (1). The motor (12) drives the shaft with a driving gear (13), and the driving gear (13) meshes with the driven gear (11).

4. The material recovery device for an aminosulfonic acid by-product dilute sulfuric acid system according to claim 2, characterized in that: The vacuum tank (3) is provided with a filter inclined plate (14). The lower end of the filter inclined plate (14) is provided with an opening on the side wall of the vacuum tank (3). A sealing baffle (15) is provided at the opening. The sealing baffle (15) is slidably installed through the baffle mounting groove (16) on the outer wall of the vacuum tank (3). The liquid delivery pipe (6) extends into the vacuum tank (3) and is located above the filter inclined plate (14).

5. A material recovery device for an aminosulfonic acid by-product dilute sulfuric acid system according to claim 4, characterized in that: The vacuum tank (3) is provided with a negative pressure pipe (17) at the top, and the negative pressure pipe (17) is connected to a negative pressure device; The vacuum tank (3) is also equipped with a vent pipe (18) on top.

6. The material recovery device for an aminosulfonic acid by-product dilute sulfuric acid system according to claim 1, characterized in that: The filter tank (2) is provided with a funnel-shaped filter cloth (19), which has a net structure. A cylindrical section (20) is provided at the bottom of the funnel-shaped filter cloth (19), and the bottom surface of the cylindrical section (20) is a bottom filter cloth (21). The drain pipe (4) extends into the filter tank (2) and is located above the funnel-shaped filter cloth (19).

7. A material recovery device for an aminosulfonic acid byproduct dilute sulfuric acid system according to claim 6, characterized in that: The filter tank (2) is also provided with a spiral lifting mechanism (22). The spiral lifting mechanism (22) is set vertically through the top of the filter tank (2). The spiral lifting blades (221) inside the spiral lifting mechanism (22) extend into the cylinder section (20). The discharge pipe (222) of the spiral lifting mechanism (22) is located outside the top of the filter tank (2).

8. A material recovery device for an aminosulfonic acid by-product dilute sulfuric acid system according to claim 1, characterized in that: The drain pipe (4) is provided with a branch pipe, which is a dilute sulfuric acid outlet pipe (23). The drain pipe (4) is equipped with a first control valve (401), the first return pipe (5) is equipped with a return pump (501), the second return pipe (7) is equipped with a second control valve (701), and the dilute sulfuric acid outlet pipe (23) is equipped with a third control valve (231).

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