Hydrogen peroxide extraction tower

Abstract

The utility model provides a hydrogen peroxide extraction tower, belongs to the technical field of hydrogen peroxide production, and aims at solving the problems that an existing device is low in extraction efficiency, high in extraction residue, small in operation elasticity and the like. 40-60 layers of tower plate assemblies are arranged in a tower body of the hydrogen peroxide extraction tower, gaps are reserved between the layers, downcomers of the adjacent tower plate assemblies are arranged in a staggered mode with the circle center and the periphery as the circle center, the sum of the inner diameter sectional areas of the downcomers of the adjacent tower plate assemblies is equal, and coalescence silk screens are fixed to the lower portions of sieve hole plates of the tower plate assemblies; an oxidation liquid distribution assembly is arranged between the first layer of tower plate assembly and the second layer of tower plate assembly, a pure water distribution assembly is arranged above the topmost layer of tower plate assembly, and an extraction liquid pipe is arranged in the center of a bottom sealing head of the tower body; and the middle lower part of the tower cap is provided with a separation filler and an oil-water coalescence silk screen, and the upper part of the tower cap is provided with a raffinate collecting assembly. The coalescence silk screen can enhance the dispersion effect of oxidation liquid and improve the mass transfer efficiency, the separation filler and the coalescence oil-water silk screen can reduce the hydrogen peroxide content of raffinate, and meanwhile, the elastic operation space of the device is enlarged.

Description

Technical Field

[0001] This application belongs to the technical field of hydrogen peroxide production, and specifically relates to an extraction tower in a hydrogen peroxide production device. Background Art

[0002] Currently, the production process of hydrogen peroxide mainly uses the anthraquinone method, which mainly includes processes such as hydrogenation, oxidation, extraction, and post-treatment. Among them, the extraction process is crucial and is related to the production efficiency of hydrogen peroxide. The extraction tower is a key equipment in the extraction process. It uses the principle that the solubility of hydrogen peroxide in water is much higher than that in the oxidation liquid and the density difference between the oxidation liquid and water. Pure water is in countercurrent contact mass transfer with the oxidation liquid to transfer the hydrogen peroxide in the oxidation liquid into the water, realizing the extraction of hydrogen peroxide.

[0003] The extraction tower is generally a sieve plate tower, which is designed into multiple layers of perforated sieve plates according to the production capacity scale. Whether the design parameters such as the number of sieve plates, the size of the sieve plate holes and the opening rate, the size of the downcomer, and the tray spacing are reasonable are all related to the extraction efficiency of the extraction tower. The extraction efficiency of the extraction towers in many existing hydrogen peroxide production devices is not very ideal. Summary of the Invention

[0004] This application proposes a hydrogen peroxide extraction tower, aiming to solve the technical problems such as low extraction efficiency, high content of residual hydrogen peroxide, and small operable flexibility of the existing device.

[0005] To achieve the above purpose, this application proposes the following technical solutions:

[0006] The hydrogen peroxide extraction tower described in this application is successively a base, a tower body, and a tower cap from bottom to top, all of which are cylindrical. The bottom of the tower body and the top of the tower cap are closed by heads to form a container;

[0007] A plurality of odd-layer tray assemblies and even-layer tray assemblies are arranged in the tower body. The number of layers is preferably 40 - 60 layers. The number of layers of the odd-layer tray assembly and the even-layer tray assembly is equal, and they are arranged at intervals with a gap between layers;

[0008] The odd-layer tray assembly and the even-layer tray assembly in the tower body are both disc-shaped. The odd-layer tray assembly consists of a sieve hole plate, coalescing wire mesh, and two downcomers 1. The even-layer tray assembly consists of a sieve hole plate, coalescing wire mesh, and four downcomers 2. The coalescing wire mesh is fixed below the sieve hole plate. The downcomer 1 and the downcomer 2 both pass through the sieve hole plate and the coalescing wire mesh. The upper ports are flush with the sieve hole plate, and the lower ports pass through the coalescing wire mesh. The two downcomers 1 of the odd-layer tray assembly are close to the center of the tray disc. The four downcomers 2 of the even-layer tray assembly are evenly distributed on the outer periphery of the tray disc. The sum of the inner diameter cross-sectional areas of the two downcomers 1 is equal to the sum of the inner diameter cross-sectional areas of the four downcomers 2;

[0009] An oxidation liquid distribution component, a pure water distribution component, an extraction liquid pipe and a sewage discharge pipe are also arranged inside the tower body, and all of them have connecting pipes passing through the outside of the tower body. The oxidation liquid distribution component is arranged between the first layer of tray component and the second layer of tray component from bottom to top. The pure water distribution component is arranged above the topmost tray component. The extraction liquid pipe is led out from the center of the bottom head of the tower body and at a position 40-50 mm higher. A sewage discharge pipe is also arranged beside the extraction liquid pipe and led out;

[0010] Inside the middle and lower part of the tower cap, a packing support, a separating packing, a wire mesh support, a coalescing oil-water wire mesh and a wire mesh pressing part are sequentially arranged from bottom to top. An extract raffinate collecting component is arranged in the upper part of the tower cap, and its connecting pipe passes through the outside of the tower cap.

[0011] Furthermore, the diameter of the tower cap is larger than that of the tower body, and a reduced-diameter connection is arranged between the two.

[0012] Compared with the prior art, the beneficial effects of the hydrogen peroxide extraction tower described in this application are as follows:

[0013] The coalescing wire mesh of the tray component can re-coalesce the oxidized liquid droplets dispersed by the lower sieve plate, orderly organize the reverse flow of the dispersed phase, reduce axial backmixing, and at the same time increase the residence time of the oxidized liquid below the sieve plate, ensuring sufficient mass transfer time, thereby improving the mass transfer efficiency;

[0014] The arrangement method of staggering the centers and peripheries of the two downcomers I and the four downcomers II of the tray component is beneficial to ensuring the continuity and uniformity of the water layer on the upper surface of the tray;

[0015] The diameter of the tower cap is larger than that of the tower body, increasing the volume of the separating packing and the coalescing oil-water wire mesh inside the tower cap, which can further separate the residual hydrogen peroxide in the extract raffinate, reduce the hydrogen peroxide content in the extract raffinate, and at the same time increase the elastic operation space of the device, and can operate between 60% and 110% of the design load. Brief Description of the Drawings

[0016] Figure 1 This is an example diagram of the hydrogen peroxide extraction tower described in this application, in which the arrangement order of the first layer to the 46th layer of tray components is annotated;

[0017] Figure 2 This is a schematic diagram of the odd-layer tray component described in this application, showing the positional relationship of the downcomer I;

[0018] Figure 3 This is a schematic diagram of the even-layer tray component described in this application, showing the positional relationship of the downcomer II.

[0019] The markings in the above drawings are explained as follows:

[0020] Base, 2-tower body, 3-oxidation liquid distribution assembly, 4-odd-layer tower plate assembly, 5-even-layer tower plate assembly, 6-filler support, 7-separation filler, 8-wire mesh support, 9-coalescing oil-water wire mesh, 10-wire mesh pressing piece, 11-tower cap, 12-raffinate collection assembly, 13-pure water distribution assembly, 14-extraction liquid pipe, 15-drain pipe,

[0021] 41-sieve plate, 42-coalescing wire mesh, 43-downcomer 1, 53-downcomer 2. DETAILED DESCRIPTION

[0022] In conjunction with the above drawings, the specific implementation of the present application is described as follows:

[0023] An embodiment of the hydrogen peroxide extraction tower described in this application is Figure 1 As shown, from bottom to top, there are a base 1, a tower body 2 and a tower cap 11, all of which are cylindrical, and the bottom of the tower body 2 and the top of the tower cap 11 are closed by a head to form a container;

[0024] The tower body 2 is provided with 46 layers of odd-layer tray assemblies 4 and even-layer tray assemblies 5, with 23 layers of odd-layer tray assemblies 4 and even-layer tray assemblies 5, which are arranged at intervals with gaps between the layers;

[0025] Comparison Figure 2 and Figure 3 The odd-layer tower plate assembly 4 and the even-layer tower plate assembly 5 are both disc-shaped, the odd-layer tower plate assembly 4 is composed of a sieve plate 41, a coalescing wire mesh 42 and two downcomers 43, and the even-layer tower plate assembly 5 is composed of a sieve plate 41, a coalescing wire mesh 42 and four downcomers 53; a coalescing wire mesh 42 is fixed below the sieve plate 41, and downcomers 43 and 53 both pass through the sieve plate 41 and the coalescing wire mesh 42, the upper port is flush with the sieve plate 41, and the lower port passes through the coalescing wire mesh 42, the two downcomers 43 of the odd-layer tower plate assembly 4 are close to the center of the tower plate disc, and the four downcomers 53 of the even-layer tower plate assembly 5 are evenly distributed on the outer periphery of the tower plate disc, and the sum of the inner diameter cross-sectional areas of the two downcomers 43 is equal to the sum of the inner diameter cross-sectional areas of the four downcomers 53;

[0026] Comparison Figure 1 The tower body 2 is also provided with an oxidation liquid distribution component 3, a pure water distribution component 13, an extraction liquid pipe 14 and a sewage pipe 15, all of which have pipes passing through the outside of the tower body 2. The oxidation liquid distribution component 3 is arranged between the first layer of the tower plate component and the second layer of the tower plate component from bottom to top, and the pure water distribution component 13 is arranged above the topmost tower plate component. The extraction liquid pipe 14 is led out from the center of the bottom head of the tower body 2 and at a position 40 to 50 mm higher. A sewage pipe 15 is also arranged next to the extraction liquid pipe 14;

[0027] The lower middle part of the tower cap 11 is provided with a packing support 6, a separation packing 7, a wire mesh support 8, an oil-water aggregation wire mesh 9 and a wire mesh pressing piece 10 in sequence from bottom to top. The upper inner part of the tower cap 11 is provided with a raffinate collecting assembly 12, and its connecting pipe passes through the outside of the tower cap 11.

[0028] The tower cap 11 has a diameter greater than that of the tower body 2 , which can further increase the volume of the separation filler 7 and the oil-water coalescing mesh 9 . A diameter-reducing connection is provided between the tower cap 11 and the tower body 2 .

[0029] The process flow of the hydrogen peroxide extraction tower described in this application when it is actually used is described as follows:

[0030] After being evenly distributed by the pure water distribution assembly 13 at the top of the tower body 2, the pure water flows through the upper surface of the sieve plate of the lower tray assembly, and flows from the downcomer to the next tray assembly. Since the downcomers of the adjacent tray assemblies are arranged alternately at the center and the periphery, a continuous and uniform water layer is formed on the upper surface of the sieve plate 41, and the pure water is thus called a continuous phase.

[0031] The oxidizing liquid containing hydrogen peroxide enters from the lower part of the tower body through the oxidizing liquid distribution component 3 and is evenly distributed in the tower body. Since the density of the oxidizing liquid is less than that of water, a countercurrent process is formed in which the oxidizing liquid rises and the pure water falls. After the oxidizing liquid is condensed by the coalescing wire mesh 42, it goes up through the sieve holes of the sieve plate 41 and contacts and mixes with the water layer on the upper surface. The oxidizing liquid dispersed into droplets is therefore called a dispersed phase.

[0032] The oxidizing liquid is dispersed through the mesh holes of the multi-layer tower plate assembly and agglomerated through the wire mesh for multiple cycles, and the water in the continuous phase is fully in contact with the droplets of the oxidizing liquid in the dispersed phase. Since the solubility of hydrogen peroxide in water is higher than that in the oxidizing liquid, hydrogen peroxide is gradually separated from the oxidizing liquid and dissolved in the water, producing a mass transfer effect. Finally, the water is enriched with hydrogen peroxide to form an extract, which is output from the extract pipe 14 at the bottom of the tower body 2.

[0033] The oxidizing liquid that has passed through all the tower plate components continues to ascend, and passes through the separation filler 7 in the tower cap 11 for oil-water separation (the oxidizing liquid dispersed into droplets is lighter than water and can float on the water surface, so it is metaphorically called oil), and then passes through the oil-water agglomeration screen 9 to agglomerate the oil in the raffinate, which is equivalent to separating hydrogen peroxide and water, thereby reducing the content of hydrogen peroxide in the raffinate, and finally the oil is collected and output through the raffinate collection component 12 to enter the subsequent reuse cycle.

[0034] It should be noted that the above is only one embodiment of the hydrogen peroxide extraction tower described in this application. Based on the technical feature principles described in this application, similar technical solution examples made should all fall within the protection scope of this application.

Claims

1. A hydrogen peroxide extraction tower, comprising, from bottom to top, a base (1), a tower body (2) and a tower cap (11), all of which are cylindrical, the bottom of the tower body (2) and the top of the tower cap (11) being sealed by a head to form a container, wherein: The tower body (2) is provided with a plurality of odd-layer tray assemblies (4) and even-layer tray assemblies (5), the number of which is preferably 40 to 60, the odd-layer tray assemblies (4) and even-layer tray assemblies (5) having the same number of layers and being spaced apart from each other with gaps between the layers; The odd-layer tray assembly (4) and the even-layer tray assembly (5) in the tower body (2) are both disc-shaped. The odd-layer tray assembly (4) is composed of a sieve plate (41), a coalescing wire mesh (42) and two downcomers (43). The even-layer tray assembly (5) is composed of a sieve plate (41), a coalescing wire mesh (42) and four downcomers (53). The coalescing wire mesh (42) is fixed below the sieve plate (41). The downcomers (43) and (53) are arranged on a cylindrical surface. 53) all pass through the sieve plate (41) and the coalescing wire mesh (42), the upper port is flush with the sieve plate (41), and the lower port passes through the coalescing wire mesh (42), the two downcomers 1 (43) of the odd-layer tower plate assembly (4) are close to the center of the tower plate disc, and the four downcomers 2 (53) of the even-layer tower plate assembly (5) are evenly distributed on the outer circumference of the tower plate disc, and the sum of the inner diameter cross-sectional areas of the two downcomers 1 (43) is equal to the sum of the inner diameter cross-sectional areas of the four downcomers 2 (53); The tower body (2) is also provided with an oxidation liquid distribution component (3), a pure water distribution component (13), an extraction liquid pipe (14) and a sewage pipe (15), all of which have pipes passing through the outside of the tower body (2). The oxidation liquid distribution component (3) is arranged between the first layer of the tower plate component and the second layer of the tower plate component from bottom to top, the pure water distribution component (13) is arranged above the topmost tower plate component, the extraction liquid pipe (14) is led out from the center of the bottom head of the tower body (2) and at a position 40 to 50 mm higher, and a sewage pipe (15) is also arranged next to the extraction liquid pipe (14) to lead out; The lower middle part of the tower cap (11) is provided with a packing support (6), a separation packing (7), a wire mesh support (8), an oil-water aggregation wire mesh (9) and a wire mesh pressing piece (10) in order from bottom to top, and the upper inner part of the tower cap (11) is provided with a raffinate collecting assembly (12), the pipe of which passes through the outside of the tower cap (11).

2. The hydrogen peroxide extraction tower according to claim 1, wherein: The tower cap (11) has a diameter greater than that of the tower body (2), and a diameter-changing connection is provided between the two.

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