Tower-type enhanced oxidation system for preparing hydrogen peroxide

Abstract

The tower-type enhanced oxidation system comprises a gas inlet pipe, a liquid inlet pipe and an enhanced tower, an inner cavity of the enhanced tower is divided into a lower enhanced cavity and an upper enhanced cavity by a middle partition plate in the enhanced tower, and the upper part of the lower enhanced cavity is communicated with the lower part of the upper enhanced cavity through a communicating pipeline; a lower micro-interface strengthening unit and a filler layer are sequentially mounted in the lower strengthening cavity from bottom to top, and a liquid inlet pipe is arranged below the lower micro-interface strengthening unit; an upper micro-interface strengthening unit, a sieve plate assembly and a sprayer are sequentially arranged in the upper strengthening cavity from bottom to top, a liquid discharging pipe is arranged at the top of the upper strengthening cavity and connected with a storage tank, a backflow pipe communicated with the sprayer is arranged on the storage tank, and the air inlet pipe is communicated with the upper micro-interface strengthening unit and the lower micro-interface strengthening unit. The system not only improves the conversion rate of the hydrogenation liquid and reduces the energy consumption of the device, but also improves the product yield of the oxidation liquid.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the hydrogen peroxide production technical field, concretely relates to a tower type reinforced oxidation system of preparation hydrogen peroxide. BACKGROUND

[0002] Hydrogen peroxide is an important inorganic chemical raw material and fine chemical product, and is widely used in chemical synthesis, pulp, paper and textile bleaching, metal mineral processing, environmental protection, electronics, military and aerospace and many other fields. With the rapid development of global economy, hydrogen peroxide is developing rapidly in all directions towards large scale, high technology and automatic control. At present, the anthraquinone method for preparing hydrogen peroxide has become a mature and reliable hydrogen peroxide industrial production technology, and is the most widely used mainstream production process in large-scale industrial production. The basic process flow is as follows: the working liquid is added to the hydrogen gas under the catalysis of palladium catalyst to generate hydrogenated liquid containing hydrogen anthraquinone, the hydrogenated liquid is reacted with oxygen to generate oxidation liquid containing anthraquinone and hydrogen peroxide, the oxidation liquid is extracted with pure water to obtain raffinate and crude dilute hydrogen peroxide, the crude dilute hydrogen peroxide is purified by aromatic hydrocarbon to obtain dilute hydrogen peroxide product, and the raffinate is regenerated by dehydration and white clay bed and then returned to the hydrogenation process for recycling. Among them, the oxidation reaction is that hydrogen anthraquinone in the hydrogenated liquid reacts with oxygen in the oxidation tower to generate anthraquinone and hydrogen peroxide, and the existing oxidation tower mostly adopts a packed type structure. During operation, the automatic oxidation reaction between air and hydrogenated liquid occurs in the packing layer, the reaction process is carried out between hydrogenated liquid and a large amount of air, and in the gas-liquid reaction process, the gas-liquid two-phase interface resistance is large, and the reaction process utilizes oxygen in air, and oxygen in air only accounts for 21%, so that the oxidation process has low reaction rate, long reaction time, low hydrogen peroxide decomposition, low oxidation yield, serious side reaction and other adverse consequences. Therefore, it is an objective need to develop a tower type reinforced oxidation system for preparing hydrogen peroxide, which has reasonable structure, low operation cost, can improve conversion rate and product yield. SUMMARY

[0003] The utility model discloses a tower type reinforced oxidation system for preparing hydrogen peroxide, which has reasonable structure, low operation cost, can improve conversion rate and product yield.

[0004] The utility model discloses a purpose is realized like this, including air inlet pipe, liquid inlet pipe and intensification tower, the middle part of intensification tower is installed with the intermediate partition, and the intermediate partition divides the inner chamber of intensification tower into lower intensification chamber and upper intensification chamber, and the lower part between the upper part of lower intensification chamber and upper intensification chamber is communicated through the communicating pipeline, and the inside of lower intensification chamber is installed with lower micro interface intensification unit and filler layer from below to above in proper order, and liquid inlet pipe is set below lower micro interface intensification unit, and the inside of upper intensification chamber is set with upper micro interface intensification unit, sieve plate subassembly and sprayer from below to above in proper order, and the top of upper intensification chamber is provided with liquid discharge pipe, and liquid discharge pipe is connected with storage tank, and the storage tank is provided with the backflow pipe of sprayer intercommunication, and the backflow pipe is installed with control valve, and air inlet pipe communicates with upper micro interface intensification unit and lower micro interface intensification unit respectively.

[0005] Compared with the prior art, the utility model has the advantages that: first, the internal structure of the intensification tower is upgraded, the internal structure of the intensification tower is arranged into two intensification chambers, the micro interface intensification units arranged in the two intensification chambers can disperse and break the air into micron-level micro-bubbles, increase the gas-liquid mass transfer area between the hydrogenation liquid, improve the oxidation efficiency of the hydrogenation liquid, and thus significantly improve the conversion rate of the hydrogenation liquid, and at the same time, the hydrogenation liquid is subjected to two-stage intensification treatment in the two intensification chambers, which can fully convert the oxidation liquid and further improve the conversion rate of the hydrogenation liquid, reduce the working temperature and pressure of the oxidation tower, reduce the energy consumption of the device, and reduce the operation cost; second, the micro interface intensification unit is provided with a corresponding filler layer and sieve plate assembly in the intensification chamber during operation, which can separate the oxidation liquid produced in the oxidation process, on the one hand, improve the product yield of the oxidation liquid, and on the other hand, improve the utilization rate of oxygen in the air. In summary, the device has the advantages of reasonable structure, low operation cost, high conversion rate, high product yield, and is easy to popularize and use. BRIEF DESCRIPTION OF DRAWINGS

[0006] Figure 1 It is the whole structure schematic diagram of the utility model;

[0007] In the drawing: 1-air inlet pipe, 2-liquid inlet pipe, 21-rotary joint, 22-rotary pipe, 23-distribution pipe, 24-driving motor, 25-driving gear, 26-driven gear, 3-intensification tower, 31-lower intensification chamber, 311-lower micro interface intensification unit, 312-filler layer, 313-lower circulating pipe, 32-upper intensification chamber, 321-upper micro interface intensification unit, 322-sieve plate subassembly, 323-sprayer, 324-upper circulating pipe, 4-intermediate partition, 5-liquid discharge pipe, 6-storage tank, 7-backflow pipe, 8-filter, 9-upper outlet, 10-lower inlet, 11-communication pipe, 12-cooler. DETAILED DESCRIPTION

[0008] The utility model makes further illustration in combination with the drawings, but does not add any way to the utility model restricts, any change or improvement based on the utility model teaching, all belong to the protection scope of the utility model.

[0009] As Figure 1 The utility model discloses a gas inlet pipe 1, liquid inlet pipe 2 and intensification tower 3, the middle part in intensification tower 3 is installed with intermediate partition 4, and intermediate partition 4 divides the inner chamber of intensification tower 3 and separates into lower intensification cavity 31 and upper intensification cavity 32, the upper portion of lower intensification cavity 31 is communicated with the lower portion of upper intensification cavity 32 through the communicating pipeline, and the inside of lower intensification cavity 31 is installed with lower micro-interface intensification unit 311 and filler layer 312 from below to above in proper order, and lower micro-interface intensification unit 311 is the structure used in the prior art, and the finished product is directly purchased according to the use demand, and filler layer 312 includes the grid that is arranged in the interval between upper and lower and the filler that is arranged between the grid, and the structured packing structure can be used to the filler, and the liquid inlet pipe 2 is arranged below lower micro-interface intensification unit 311, the inside of upper intensification cavity 32 is sequentially provided with upper micro-interface intensification unit 321, sieve plate assembly 322 and sprayer 323 from below to above, and upper micro-interface intensification unit 321 is the structure used in the prior art, and the finished product can be directly purchased according to the use power, the top of upper intensification cavity 32 is provided with liquid outlet pipe 5, and the liquid outlet pipe 5 is connected with storage tank 6, the storage tank 6 is provided with backflow pipe 7 that communicates with sprayer 323, the control valve is installed on backflow pipe 7, and the gas inlet pipe 1 is communicated with upper micro-interface intensification unit 321 and lower micro-interface intensification unit 311 respectively.

[0010] The working process of the utility model is: hydrogenation liquid enters into the lower intensification cavity 31 through the liquid inlet pipe 2, at this time, air is introduced into the lower micro-interface intensification unit 311 and the upper micro-interface intensification unit 321 through the air inlet pipe 1, the air is dispersed into micron-sized micro-bubbles after entering the lower micro-interface intensification unit 311, the micro-bubbles contact the hydrogenation liquid and part of the hydrogenation liquid is oxidized into oxidation liquid, the oxidation liquid produced by oxidation and the hydrogenation liquid not oxidized are separated by the filler layer 312, then enter the upper intensification cavity 32 through the connecting pipeline, at this time, the air entering the upper micro-interface intensification unit 321 through the air inlet pipe 1 is dispersed into micron-sized micro-bubbles, the micro-bubbles contact the oxidation liquid produced by oxidation and the hydrogenation liquid not oxidized, which can completely oxidize the hydrogenation liquid not oxidized into oxidation liquid, the oxidation liquid produced by complete oxidation is separated by the sieve plate assembly 322, then enters the storage tank 6 through the liquid outlet pipe 5, in order to improve the conversion efficiency of the hydrogenation liquid, the oxidation liquid in the storage tank 6 can enter the sprayer 323 through the reflux pipe 7 and be sprayed downward to contact the hydrogenation liquid not oxidized, which can improve the conversion efficiency of the hydrogenation liquid, the lower micro-interface intensification unit 311 and the upper micro-interface intensification unit 321 can not only increase the gas-liquid mass transfer area between the air and the hydrogenation liquid and improve the conversion rate of the hydrogenation liquid, but also can reduce the working temperature and pressure of the intensification tower 3, reduce the energy consumption of the device and reduce the operation cost.

[0011] Further, the lower micro-interface intensification unit 311 includes two lower micro-interface generators with opposite outlets, a lower liquid collecting pipe is arranged between the outlets of the two lower micro-interface generators, a plurality of lower liquid guiding holes are uniformly arranged on the pipe wall of the lower liquid collecting pipe, and the two lower micro-interface generators are communicated with the air inlet pipe 1 through branch pipes.

[0012] Further, the upper micro-interface intensifier unit 321 comprises two upper micro-interface generators opposite to each other, and an upper liquid collecting pipe is arranged between the outlets of the two upper micro-interface generators, a plurality of upper liquid guiding holes are uniformly arranged on the pipe wall of the upper liquid collecting pipe, and the two upper micro-interface generators are communicated with the air inlet pipe 1 through branch pipes. The outlets of the two upper micro-interface generators are arranged opposite to each other, so that the two micro-bubble flows collide with each other, the uniform dispersion of the micro-bubbles is promoted, the dispersed micro-bubbles flow out of the upper liquid guiding holes of the upper liquid collecting pipe and enter the upper intensification cavity, so that the gas-liquid mass transfer area between the hydrogenation liquid and air is increased, and the upper micro-interface generator can be a pneumatic micro-interface generator, a hydraulic micro-interface generator or a gas-liquid linkage type micro-interface generator. In the embodiment, the two lower micro-interface generators are pneumatic micro-interface generators. Preferably, in order to improve the conversion rate of the hydrogenation liquid, an upper circulating pipe 324 is arranged on the upper intensification cavity 32, the upper circulating pipe 324 is communicated with the upper micro-interface generator located above, and an upper circulating pump and a control valve are sequentially installed on the upper circulating pipe 324.

[0013] In order to avoid that impurities in the air enter the upper intensification cavity 32 and the lower intensification cavity 31 and affect the quality of the product, an air filter 8 is installed on the air inlet pipe 1.

[0014] Further, the communication pipeline comprises an upper outlet 9, a lower inlet 10 and a communication pipe 11, the upper outlet 9 is arranged on the lower intensification cavity 31 above the filler layer 312, the lower inlet 10 is arranged on the upper intensification cavity 32 below the upper micro-interface intensifier unit 321, the communication pipe 11 is installed between the upper outlet 9 and the lower inlet 10, a cooling device 12 is installed on the communication pipe 11, the oxidized liquid after passing through the lower intensification cavity 31 and the hydrogenation liquid not oxidized are discharged through the upper outlet 9, enter the upper inlet 10 through the communication pipe 11, and then enter the upper intensification cavity 32 through the upper inlet 10.

[0015] In order to realize better gas-liquid separation and improve the purity of the oxidized liquid, the sieve plate assembly 322 comprises a plurality of sieve plates arranged at equal intervals in the upper intensification cavity, a plurality of sieve holes are uniformly processed on each sieve plate, and the diameters of the sieve holes on each sieve plate gradually decrease from top to bottom.

[0016] Further, in order to make the hydrogenation liquid in the lower enhancement cavity 31 fully and uniformly contact with the bubbles, the liquid inlet pipe 2 is connected with a rotating pipe 22 extending into the lower enhancement cavity 31 through a rotating joint 21, the end of the rotating pipe 22 is sealed by a sealing plate, a distribution pipe 23 is installed on the rotating pipe 22 in the lower enhancement cavity 31 along the axial direction thereof, a driving motor 24 is installed on the outer wall of the lower enhancement cavity 31, the driving motor 24 is a structure used in the prior art, and a finished product can be directly purchased according to the used power, a driving gear 25 is installed on the output shaft of the driving motor 24, a driven gear 26 is installed on the rotating pipe 22 outside the lower enhancement cavity 31, the driving gear 25 and the driven gear 26 are meshed with each other, in use, the driving motor 24 drives the driving gear 25 to rotate, the driving gear 25 drives the rotating pipe 22 to rotate through the driven gear 26, and in the process of rotating, the rotating pipe 22 can uniformly distribute the hydrogenation liquid in the liquid inlet pipe 2 in the lower enhancement cavity 31, so that the hydrogenation liquid uniformly contacts with the bubbles.

Claims

1. A tower type enhanced oxidation system for preparing hydrogen peroxide, comprising a gas inlet pipe (1), a liquid inlet pipe (2) and an enhanced tower (3), characterized in that: The middle part of the reinforced tower (3) is provided with an intermediate partition plate (4), which divides the inner cavity of the reinforced tower (3) into a lower reinforced cavity (31) and an upper reinforced cavity (32), the upper part of the lower reinforced cavity (31) and the lower part of the upper reinforced cavity (32) are communicated through a communication pipeline, the inside of the lower reinforced cavity (31) is sequentially provided from bottom to top with a lower micro-interface reinforcement unit (311) and a filler layer (312), and the liquid inlet pipe (2) is arranged below the lower micro-interface reinforcement unit (311); the inside of the upper reinforced cavity (32) is sequentially provided from bottom to top with an upper micro-interface reinforcement unit (321), a sieve plate assembly (322) and a sprayer (323), the top of the upper reinforced cavity (32) is provided with a liquid outlet pipe (5), the liquid outlet pipe (5) is connected with a storage tank (6), the storage tank (6) is provided with a reflux pipe (7) communicated with the sprayer (323), the reflux pipe (7) is provided with a control valve, and the air inlet pipe (1) is communicated with the upper micro-interface reinforcement unit (321) and the lower micro-interface reinforcement unit (311) respectively.

2. A tower enhanced oxidation system for the production of hydrogen peroxide according to claim 1, characterized in that: The lower micro-interface reinforcement unit (311) comprises two lower micro-interface generators with opposite outlets, and a lower liquid collecting pipe is arranged between the outlets of the two lower micro-interface generators, a plurality of lower liquid guiding holes are uniformly arranged on the pipe wall of the lower liquid collecting pipe, and the two lower micro-interface generators are communicated with the air inlet pipe (1) through branch pipes.

3. A tower enhanced oxidation system for the production of hydrogen peroxide according to claim 2, characterized in that: A lower circulating pipe (313) is arranged on the lower reinforced cavity (31), the lower circulating pipe (313) is communicated with the lower micro-interface generator located above, and a lower circulating pump is sequentially arranged on the lower circulating pipe (313).

4. A tower enhanced oxidation system for the production of hydrogen peroxide according to claim 1, characterized in that: The upper micro-interface reinforcement unit (321) comprises two upper micro-interface generators with opposite outlets, an upper liquid collecting pipe is arranged between the outlets of the two upper micro-interface generators, a plurality of upper liquid guiding holes are uniformly arranged on the pipe wall of the upper liquid collecting pipe, and the two upper micro-interface generators are communicated with the air inlet pipe (1) through branch pipes.

5. A tower enhanced oxidation system for the production of hydrogen peroxide according to claim 4, characterized in that: An upper circulating pipe (324) is arranged on the upper reinforced cavity (32), the upper circulating pipe (324) is communicated with the upper micro-interface generator located above, and an upper circulating pump and a control valve are sequentially arranged on the upper circulating pipe (324).

6. A tower enhanced oxidation system for the production of hydrogen peroxide according to claim 1, characterized in that: An air filter (8) is arranged on the air inlet pipe (1).

7. A tower enhanced oxidation system for the production of hydrogen peroxide according to claim 1, characterized in that: The communication pipeline comprises an upper outlet (9), a lower inlet (10) and a communication pipe (11), the upper outlet (9) is arranged on the lower reinforced cavity (31) above the filler layer (312), the lower inlet (10) is arranged on the upper reinforced cavity (32) below the upper micro-interface reinforcement unit (321), the communication pipe (11) is arranged between the upper outlet (9) and the lower inlet (10), and a cooling device (12) is arranged on the communication pipe (11).

8. A tower enhanced oxidation system for the production of hydrogen peroxide according to claim 1, characterized in that: The sieve plate assembly (322) comprises a plurality of sieve plates arranged at equal intervals in the upper reinforced cavity, a plurality of sieve holes are uniformly processed on each sieve plate, and the diameters of the sieve holes on each sieve plate gradually decrease from top to bottom.

9. A tower enhanced oxidation system for the production of hydrogen peroxide according to claim 1, characterized in that: The inlet pipe (2) is connected with a rotating pipe (22) extending into the lower reinforced cavity (31) through a rotating joint (21), the end of the rotating pipe (22) is sealed by a sealing plate, a distribution pipe (23) is mounted on the rotating pipe (22) in the lower reinforced cavity (31) along the axial direction thereof, a driving motor (24) is mounted on the outer wall of the lower reinforced cavity (31), a driving gear (25) is mounted on the output shaft of the driving motor (24), a driven gear (26) is mounted on the rotating pipe (22) outside the lower reinforced cavity (31), and the driving gear (25) and the driven gear (26) are in meshing engagement with each other.

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