Phosphoric acid preparation device for hydrogen peroxide production

Abstract

The utility model provides a phosphoric acid preparation device for hydrogen peroxide production, which comprises a preparation tank, the preparation tank is connected with a dilute phosphoric acid storage tank, the preparation tank is internally provided with a stirring structure, the top of the preparation tank is provided with a premixing structure, and the premixing structure is connected with two liquid storage structures capable of quantitatively supplying liquid to the premixing structure. Wherein one liquid storage structure is used for storing strong phosphoric acid, and the other liquid storage structure is used for storing pure water. According to the phosphoric acid preparation device, strong phosphoric acid and pure water can be premixed while being added into the preparation tank at the same time, so that the time for adding the strong phosphoric acid and the pure water into the preparation tank can be shortened, the stirring time of the stirring structure can be shortened, and the phosphoric acid preparation efficiency is effectively improved.

Description

Technical Field

[0001] This application relates to phosphoric acid preparation technology, and particularly to a phosphoric acid preparation device for hydrogen peroxide production. Background Art

[0002] In the hydrogen peroxide production process, dilute phosphoric acid (mass fraction 40% - 50%) needs to be added at different positions to make the system acidic to prevent hydrogen peroxide from decomposing when encountering alkali and thus causing accidents. For example, dilute phosphoric acid is added before the hydrogenated liquid enters the oxidation tower, before pure water enters the extraction tower, and during the working fluid washing process. Among them, the dilute phosphoric acid used in hydrogen peroxide production is made by diluting concentrated phosphoric acid (mass fraction 75% or 85%) with pure water.

[0003] Currently, an existing phosphoric acid preparation device includes a concentrated phosphoric acid storage tank, a pure water storage tank, a preparation tank, and a dilute phosphoric acid storage tank. The concentrated phosphoric acid storage tank, the pure water storage tank, and the dilute phosphoric acid storage tank are all connected to the preparation tank, and a stirring structure and a liquid level gauge are provided inside the preparation tank. When in use, first, the pure water in the pure water storage tank is transported into the preparation tank, and the amount of pure water added is determined according to the liquid level gauge. Then, the concentrated phosphoric acid in the concentrated phosphoric acid storage tank is transported into the preparation tank, and the amount of concentrated phosphoric acid added is determined through the liquid level gauge. Finally, the stirring structure stirs and mixes the pure water and phosphoric acid to prepare dilute phosphoric acid. After the dilute phosphoric acid is prepared, it is transported to the dilute phosphoric acid storage tank for temporary storage, and the dilute phosphoric acid in the dilute phosphoric acid storage tank is transported to each position where dilute phosphoric acid needs to be added through a transport pipeline.

[0004] Although the method of adding water first and then concentrated phosphoric acid can determine the amount of pure water added and the amount of concentrated phosphoric acid added in the preparation tank through the liquid level gauge, the method of adding water first and then concentrated phosphoric acid will result in a long time-consuming phosphoric acid preparation process and low preparation efficiency. Utility Model Content

[0005] This application provides a phosphoric acid preparation device for hydrogen peroxide production to solve the problem that the existing phosphoric acid preparation device has a long preparation process and low preparation efficiency when preparing phosphoric acid.

[0006] This application provides a phosphoric acid preparation device for hydrogen peroxide production, including a preparation tank. The preparation tank is connected to a dilute phosphoric acid storage tank, and a stirring structure is provided inside the preparation tank;

[0007] A premixing structure is provided at the top of the preparation tank;

[0008] The premixing structure is connected to two liquid storage structures that can supply liquid to it quantitatively;

[0009] One of the liquid storage structures stores concentrated phosphoric acid, and the other liquid storage structure stores pure water.

[0010] Optionally, the premixing structure includes a vertical pipe, the lower end of the vertical pipe is fixedly connected with a horizontal pipe perpendicular to and communicating with it, and a plurality of liquid discharge ports are arranged at the bottom of the horizontal pipe;

[0011] The horizontal pipe is located at the inner top of the preparation tank, and the upper end of the vertical pipe is simultaneously connected to two liquid storage structures.

[0012] Optionally, a plurality of net plates distributed up and down are fixed inside the vertical pipe.

[0013] Optionally, the vertical pipe penetrates through the upper end of the mixing tank and is rotatably connected to the upper end of the preparation tank. The vertical pipe is connected with a driving mechanism capable of driving it to rotate. The upper end of the vertical pipe is sealed and rotatably connected with a liquid inlet pipe, and the liquid inlet pipe is simultaneously connected to two liquid storage structures.

[0014] Optionally, the driving mechanism includes a motor. The motor is connected to the vertical pipe through a belt transmission mechanism, and the motor is fixed at the upper end of the preparation tank.

[0015] Optionally, the liquid storage structure includes a tank body. A liquid adding pipe is arranged at the upper part of the tank body. A first electric valve is connected to the lower part of the tank body, and the first electric valve is connected with a metering pump. The metering pump is connected to the liquid inlet pipe through a conveying pipeline.

[0016] Optionally, the stirring structure includes a stirring shaft. The stirring shaft is fixedly connected with the horizontal pipe, and a plurality of stirring blades distributed up and down are arranged on the stirring shaft.

[0017] Compared with the prior art, the beneficial effects of the present application are as follows:

[0018] The phosphoric acid preparation device for hydrogen peroxide production provided by the present application is provided with a premixing structure at the top of the preparation tank. The premixing structure is connected with two liquid storage structures capable of supplying liquid to it quantitatively. One of the liquid storage structures stores concentrated phosphoric acid, and the other liquid storage structure stores pure water. When preparing phosphoric acid, one of the liquid storage structures transports a certain amount of concentrated phosphoric acid to the premixing structure, and at the same time, the other liquid storage structure transports a certain amount of pure water to the premixing structure. The concentrated phosphoric acid and pure water enter the premixing structure for premixing at the same time, and then enter the preparation tank and are fully stirred and mixed by the stirring structure to prepare dilute phosphoric acid. Therefore, compared with the existing dilute phosphoric acid preparation method, when adding concentrated phosphoric acid and pure water into the preparation tank at the same time, the concentrated phosphoric acid and pure water can be premixed, which can not only shorten the time for adding concentrated phosphoric acid and pure water into the preparation tank, but also shorten the stirring time of the stirring structure, effectively improving the efficiency of phosphoric acid preparation. Description of the Drawings

[0019] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic diagram of the overall structure of the phosphoric acid preparation device for hydrogen peroxide production provided by an embodiment of the present application;

[0021] Figure 2 It is a schematic diagram of the main view sectional structure of the preparation tank of the phosphoric acid preparation device for hydrogen peroxide production provided by an embodiment of the present application;

[0022] Figure 3 It is a schematic diagram of the main view sectional structure of the premixing structure of the phosphoric acid preparation device for hydrogen peroxide production provided by an embodiment of the present application;

[0023] Figure 4 It is a schematic diagram of the partial three-dimensional structure of the phosphoric acid preparation device for hydrogen peroxide production provided by an embodiment of the present application.

[0024] Explanation of reference numerals: preparation tank 1, dilute phosphoric acid storage tank 2, drain pipe 3, second electric valve 4, liquid extraction pump 5, stirring structure 6, stirring shaft 61, stirring blades 62, premixing structure 7, vertical pipe 71, horizontal pipe 72, drain port 73, mesh plate 74, liquid inlet pipe 75, liquid storage structure 8, tank body 81, liquid adding pipe 82, first electric valve 83, metering pump 84, conveying pipeline 85, driving mechanism 9, motor 91, belt transmission mechanism 92. Detailed implementation manners

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following clearly and completely describes the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts also belong to the scope of protection of the present application.

[0026] As Figures 1 - 4 shown:

[0027] The phosphoric acid preparation device for hydrogen peroxide production provided by an embodiment of the present application includes a preparation tank 1, and the preparation tank 1 is connected to a dilute phosphoric acid storage tank 2. Specifically, the bottom of the preparation tank 1 is connected to a drain pipe 3, and the drain pipe 3 is provided with a second electric valve 4 and a liquid extraction pump 5, and the drain pipe 3 is connected to the dilute phosphoric acid storage tank 2. The inside of the preparation tank 1 is provided with a stirring structure 6.

[0028] The top of the preparation tank 1 is provided with a premixing structure 7 for premixing concentrated phosphoric acid and pure water.

[0029] The premixing structure 7 is connected to two liquid storage structures 8 that can supply liquid to it quantitatively. One of the liquid storage structures 8 stores concentrated phosphoric acid, and the other liquid storage structure 8 stores pure water.

[0030] During use, the liquid storage structure 8 storing concentrated phosphoric acid transports a certain amount of concentrated phosphoric acid to the premixing structure 7, and at the same time, the liquid storage structure 8 storing pure water transports a certain amount of pure water to the premixing structure 7. The concentrated phosphoric acid and pure water enter the premixing structure 7 simultaneously. The premixing structure 7 premixes the concentrated phosphoric acid and pure water to form a premixed liquid, and then the premixed liquid enters the preparation tank 1. The stirring structure 6 stirs the premixed liquid to fully mix the concentrated phosphoric acid and pure water to form dilute phosphoric acid. Among them, the amounts of concentrated phosphoric acid and pure water are determined according to the actual required concentration of dilute phosphoric acid.

[0031] For the phosphoric acid preparation device for hydrogen peroxide production provided in this embodiment, since the top of the preparation tank 1 is provided with a premixing structure 7, and the premixing structure 7 is connected to two liquid storage structures 8 that can supply liquid to it quantitatively. One of the liquid storage structures 8 stores concentrated phosphoric acid, and the other liquid storage structure 8 stores pure water. When preparing phosphoric acid, while adding concentrated phosphoric acid and pure water into the preparation tank 1 simultaneously, the concentrated phosphoric acid and pure water can be premixed, which can not only shorten the time used for adding concentrated phosphoric acid and pure water into the preparation tank 1, but also shorten the stirring time of the stirring structure 6, thereby improving the efficiency of phosphoric acid preparation.

[0032] In some embodiments of the present application, the premixing structure 7 includes a vertical pipe 71. The lower end of the vertical pipe 71 is fixedly connected to a horizontal pipe 72 that is perpendicular to and communicates with it. The bottom of the horizontal pipe 72 is provided with a plurality of liquid discharge ports 73. Specifically, the horizontal pipe 72 is a hollow structure with both ends closed. The horizontal pipe 72 is located at the inner top of the preparation tank 1, and the upper end of the vertical pipe 71 is connected to both liquid storage structures 8 simultaneously.

[0033] During use, concentrated sulfuric acid and pure water enter the vertical pipe 71 simultaneously, are premixed in the vertical pipe 71, then enter the horizontal pipe 72, and simultaneously enter the preparation tank 1 from all the liquid discharge ports 73.

[0034] In order to further improve the premixing effect of concentrated phosphoric acid and pure water, in some embodiments of the present application, a plurality of mesh plates 74 distributed vertically are fixed inside the vertical pipe 71.

[0035] In some embodiments of the present application, the vertical pipe 71 penetrates through the upper end of the preparation tank and is rotatably connected to the upper end of the preparation tank 1 through a bearing. The vertical pipe 71 is connected to a driving mechanism 9 that can drive it to rotate. The upper end of the vertical pipe 71 is sealed and rotatably connected to a liquid inlet pipe 75, and the liquid inlet pipe 75 is simultaneously connected to both liquid storage structures 8.

[0036] Specifically, the liquid inlet pipe 75 is a hollow structure with an open lower end. The lower end of the liquid inlet pipe 75 is sleeved on the vertical pipe 71 and is hermetically connected to the vertical pipe 71 through a sealed bearing.

[0037] During use, concentrated phosphoric acid and pure water enter the liquid inlet pipe 75. The concentrated phosphoric acid and pure water enter the vertical pipe 71 from the liquid inlet pipe 75, and are pre-mixed under the action of the vertical pipe 71 and the mesh plate 74 to form a pre-mixed liquid. Then, the pre-mixed liquid flows from the vertical pipe 71 into the horizontal pipe 72 and falls from the liquid discharge port 73 to the bottom of the preparation tank 1. At the same time, the driving mechanism 9 is started. The driving mechanism 9 drives the vertical pipe 71 to rotate, and the vertical pipe 71 drives the horizontal pipe 72 to rotate. While the horizontal pipe 72 is rotating, the stirring structure 6 is started, and the stirring structure 6 stirs and mixes the pre-mixed liquid in the preparation tank 1. At the same time, the pre-mixed liquid falling from the liquid discharge port 73 evenly falls onto the stirred liquid surface, enabling the concentrated phosphoric acid and pure water to be quickly mixed, thereby shortening the stirring and mixing time.

[0038] In some embodiments of the present application, the driving mechanism 9 includes a motor 91. The motor 91 is connected to the vertical pipe 71 through a belt transmission mechanism 92, and the motor 91 drives the vertical pipe 71 to rotate by driving the transmission mechanism. The motor 91 is fixed to the upper end of the preparation tank 1.

[0039] In some embodiments of the present application, the liquid storage structure 8 includes a tank body 81. A liquid addition pipe 82 is provided at the upper part of the tank body 81. A first electric valve 83 is connected to the lower part of the tank body 81, and a metering pump 84 is connected to the first electric valve 83. The metering pump 84 is connected to the liquid inlet pipe 75 through a delivery pipeline 85.

[0040] Furthermore, a liquid level gauge is provided inside the tank body 81 to facilitate determining the liquid storage volume of the tank body 81.

[0041] During use, two first electric valves 83 are opened simultaneously, and two metering pumps 84 are started simultaneously. The addition amounts of concentrated phosphoric acid and pure water are determined by metering through the metering pumps 84, so that a quantitative amount of concentrated phosphoric acid and a quantitative amount of pure water can be added to the preparation pipe simultaneously.

[0042] In some embodiments of the present application, the stirring structure 6 includes a stirring shaft 61. The stirring shaft 61 is fixedly connected to the horizontal pipe 72, and a plurality of stirring blades 62 distributed up and down are provided on the stirring shaft 61.

[0043] During use, after the horizontal pipe 72 rotates, it drives the stirring shaft 61 to rotate, and the stirring shaft 61 drives the stirring blades 62 to rotate to mix the concentrated phosphoric acid and pure water to prepare dilute phosphoric acid.

[0044] In some embodiments of the present application, those skilled in the art can design a corresponding automatic control system according to the common knowledge in the art. The automatic control system controls the first electric valve 83, the metering pump 84, the motor 91, the second electric valve 4, and the liquid extraction pump 5, thereby achieving the effect of automatically preparing phosphoric acid.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A phosphoric acid preparation device for hydrogen peroxide production, comprising a preparation tank (1), the preparation tank (1) is connected to a dilute phosphoric acid storage tank (2), and a stirring structure (6) is arranged inside the preparation tank (1), characterized in that: A premixing structure (7) is arranged at the top of the preparation tank (1); The premixing structure (7) is connected to two liquid storage structures (8) capable of quantitatively supplying liquid to it; One of the liquid storage structures (8) stores concentrated phosphoric acid, and the other liquid storage structure (8) stores pure water.

2. The phosphoric acid preparation device for hydrogen peroxide production according to claim 1, characterized in that: The premixing structure (7) includes a vertical pipe (71), the lower end of the vertical pipe (71) is fixedly connected to a horizontal pipe (72) perpendicular to and communicating with it, and a plurality of liquid discharge ports (73) are arranged at the bottom of the horizontal pipe (72); The horizontal pipe (72) is located at the inner top of the preparation tank (1), and the upper end of the vertical pipe (71) is simultaneously connected to two liquid storage structures (8).

3. The phosphoric acid preparation device for hydrogen peroxide production according to claim 2, characterized in that: A plurality of mesh plates (74) distributed up and down are fixed inside the vertical pipe (71).

4. The phosphoric acid preparation device for hydrogen peroxide production according to claim 2, wherein: The vertical pipe (71) penetrates through the upper end of the distribution tank and is rotatably connected to the upper end of the preparation tank (1). The vertical pipe (71) is connected to a driving mechanism (9) capable of driving it to rotate. The upper end of the vertical pipe (71) is hermetically and rotatably connected to a liquid inlet pipe (75), and the liquid inlet pipe (75) is simultaneously connected to two liquid storage structures (8).

5. The phosphoric acid preparation device for hydrogen peroxide production according to claim 4, characterized in that: The driving mechanism (9) includes a motor (91), the motor (91) is connected to the vertical pipe (71) through a belt transmission mechanism (92), and the motor (91) is fixed to the upper end of the preparation tank (1).

6. The phosphoric acid preparation device for hydrogen peroxide production according to claim 4, wherein: The liquid storage structure (8) includes a tank body (81), a liquid adding pipe (82) is arranged at the upper part of the tank body (81), the lower part of the tank body (81) is connected to a first electric valve (83), and the first electric valve (83) is connected to a metering pump (84). The metering pump (84) is connected to the liquid inlet pipe (75) through a delivery pipeline (85).

7. The phosphoric acid preparation device for hydrogen peroxide production according to claim 4, characterized in that: The stirring structure (6) includes a stirring shaft (61), the stirring shaft (61) is fixedly connected to the horizontal pipe (72), and a plurality of stirring blades (62) distributed up and down are arranged on the stirring shaft (61).

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