A technical grade hydrogen peroxide product purification device

Abstract

The utility model discloses a kind of technical grade hydrogen peroxide product purification device, mainly by oxidation tower, extraction tower, purification tower I, falling film evaporator, rectifying tower, purification tower II is formed, 60% technical grade hydrogen peroxide pipeline after cooling of falling film evaporator is connected with lower part in oxidation tower, hydrogen peroxide pipeline of oxidation tower bottom outlet is connected with upper part of purification tower II, aromatic hydrocarbon pipeline is connected with lower part of purification tower II.In the present application, after 60% technical grade hydrogen peroxide is returned to oxidation tower preliminary purification, it is sent into purification tower II again, continue to reduce TOC, metal ion and other impurities in 60% technical grade hydrogen peroxide, and purified hydrogen peroxide is obtained.The present application does not need to use adsorption tower, can reduce waste liquid, waste adsorbent generated in adsorption process, and the effective component of working fluid is recycled, consumption is reduced, and the safety performance of device is improved;Industrial grade dilute product hydrogen peroxide, industrial grade concentrated product hydrogen peroxide and chemical grade concentrated product hydrogen peroxide can be obtained simultaneously.

Description

Technical Field

[0001] This invention belongs to the field of chemical technology and relates to a method for purifying technical-grade hydrogen peroxide products, particularly a technical-grade hydrogen peroxide product purification device. Background Technology

[0002] Hydrogen peroxide (also known as hydrogen peroxide solution) is an important inorganic chemical raw material widely used in many fields such as papermaking, textiles, chemical synthesis, military industry, electronics, food processing, pharmaceuticals, cosmetics, environmental protection, and metallurgy. Hydrogen peroxide decomposes to produce water and oxygen, causing no secondary pollution to the environment, making it a green chemical.

[0003] With the expanding applications of hydrogen peroxide, many fields, such as the production of caprolactam and propylene oxide, have increasingly stringent requirements for its high concentration and purity. This necessitates the concentration and purification of hydrogen peroxide. Current technology involves further removing organic compounds from the concentrated, technical-grade hydrogen peroxide using an adsorption tower to reduce the TOC (total carbon) content. However, adsorption towers require regeneration after a period of operation when the adsorption capacity reaches saturation. This regeneration process uses methanol and alkali, generating large amounts of waste liquid and wastewater. Simultaneously, the adsorbent needs to be replaced at certain intervals, resulting in hazardous solid waste. Furthermore, during adsorption tower regeneration, the resin adsorbs high concentrations of hydrogen peroxide; if not replaced promptly, this can easily lead to hydrogen peroxide decomposition accidents caused by overheating and overpressure.

[0004] To overcome the aforementioned shortcomings, a technical-grade product purification method for hydrogen peroxide devices that does not require an adsorption tower has been invented. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a purification device and method for technical-grade hydrogen peroxide products. The device sends a portion of the technical-grade hydrogen peroxide with a mass fraction of 50-60% after falling film evaporation to an oxidation tower for initial purification, and then sends it to a purification tower for aromatic extraction and purification, thereby reducing the impurity content in the hydrogen peroxide and obtaining industrial-grade concentrated hydrogen peroxide.

[0006] The technical solution of this invention:

[0007] A high-tech hydrogen peroxide product purification device mainly consists of an oxidation tower, an extraction tower, a purification tower I, a falling film evaporator, a distillation tower, and a purification tower II. A hydrogenated liquid pipeline is connected to the upper part of the oxidation tower, an oxidation tail gas pipeline is connected to the top of the oxidation tower, a compressed air pipeline is connected to the lower part of the oxidation tower, the oxidation liquid outlet at the lower part of the oxidation tower is connected to an oxidation liquid receiving tank, the oxidation liquid receiving tank is connected to the inlet of a centrifugal pump, the outlet of the centrifugal pump is connected to the lower part of the extraction tower, the hydrogen peroxide outlet at the bottom of the oxidation tower is connected to the upper part of purification tower II, an aromatic hydrocarbon pipeline is connected to the lower part of purification tower II, and a pure water pipeline is connected to the upper part of the extraction tower. The raffinate is then transported to the extraction tower. The pipeline is connected to the upper part of the extraction tower. The coarse and dilute hydrogen peroxide pipeline at the bottom of the extraction tower is connected to the upper part of purification tower I. The aromatic hydrocarbon pipeline is connected to the lower part of purification tower I. The hydrogen peroxide outlet at the bottom of purification tower I is connected to the coalescer. The hydrogen peroxide outlet of the coalescer is connected to the hydrogen peroxide inlet of the falling film evaporator. The hydrogen peroxide outlet at the bottom of the falling film evaporator is connected to the lower part of the distillation tower. The hydrogen peroxide outlet at the bottom of the falling film evaporator is connected to the middle and lower part of the oxidation tower. The vapor phase outlet at the top of the distillation tower is connected to the condenser at the top of the distillation tower. The vapor phase outlet of the condenser at the top of the distillation tower is connected to the vacuum pump. The hydrogen peroxide outlet at the bottom of the distillation tower is connected to the chemical-grade hydrogen peroxide cooler.

[0008] The oxidation tower is equipped with a built-in cooler and a gas and liquid redistributor.

[0009] The oxidizing liquid is discharged from the bottom of the oxidation tower and enters the oxidizing liquid receiving tank. The oxidizing liquid in the receiving tank is then pumped into the bottom of the extraction tower by a centrifugal pump.

[0010] Pure water and oxidizing solution are extracted countercurrently in the extraction tower. The raffinate flows out from the top of the extraction tower, and the crude hydrogen peroxide flows out from the bottom of the extraction tower.

[0011] The hydrogen peroxide outlet at the bottom of purification tower I is first connected to the coalescer, then to the centrifugal pump inlet, the centrifugal pump outlet is connected to the preheater, and the preheater outlet is connected to the hydrogen peroxide inlet of the falling film evaporator.

[0012] The hydrogen peroxide outlet at the bottom of the falling film evaporator is connected to the cooler via a centrifugal pump, and the hydrogen peroxide pipeline at the cooler outlet is connected to the lower part of the oxidation tower; the outlet of the centrifugal pump is also connected to the feed pipeline of the falling film evaporator.

[0013] The hydrogen peroxide outlet pipe at the bottom of the oxidation tower is connected to the upper part of purification tower II, and the aromatic hydrocarbon pipe is connected to the lower part of purification tower II.

[0014] The steam outlet pipeline of the distillation column is connected to a steam jet pump.

[0015] After the non-condensable gas in the distillation column is cooled by the in-column cooler, the gas phase outlet pipeline is connected to the inlet of the top condenser of the distillation column, and the outlet of the top condenser of the distillation column is connected to the vacuum pump, through which the non-condensable gas is discharged.

[0016] A method for purifying technical-grade hydrogen peroxide products involves the following steps: Hydrogenated liquid from the hydrogenation process is introduced from the top of an oxidation tower, while compressed air is introduced from the bottom. Countercurrent oxidation yields an oxidizing liquid containing 0.1–1.5% hydrogen peroxide by mass. After buffering in an oxidizing liquid receiving tank, the oxidizing liquid is pressurized by a centrifugal pump and then countercurrently extracted with pure water in an extraction tower to obtain a crude hydrogen peroxide solution with a mass fraction of 25–40% and raffinate. The crude hydrogen peroxide is then extracted with aromatics in purification tower I to obtain dilute industrial-grade hydrogen peroxide with a mass fraction of 25%–40%. The hydrogen peroxide after aromatic extraction enters a coalescer from the bottom outlet of purification tower I. In the coalescer, after separating the aromatics, a portion is produced as industrial-grade dilute hydrogen peroxide with a mass fraction of 25–40%, while the remaining portion is pressurized by a centrifugal pump and heated in a preheater. The hydrogen peroxide enters the falling film evaporator for heating. The bottom of the evaporator contains 50-60% technical-grade hydrogen peroxide by mass, while the middle and lower sections contain 18-30% hydrogen peroxide by mass. The lower portion of the hydrogen peroxide enters the distillation column. The 50-60% technical-grade hydrogen peroxide at the bottom of the falling film evaporator is circulated by a pump, and a portion of it is cooled in a circulating cooler before entering the oxidation column from the lower part. After purification, it exits from the bottom of the oxidation column and enters purification column II from the top. After further purification, a 50-65% concentrated industrial-grade product is obtained, while the remaining hydrogen peroxide is returned to the inlet of the falling film evaporator. The hydrogen peroxide from the falling film evaporator is then distilled in the distillation column to concentrate it, yielding a 50-60% chemical-grade hydrogen peroxide by mass, with a total carbon (TOC) content of 10-50 ppm (by weight).

[0017] The compressed air and hydrogenated liquid undergo countercurrent oxidation within the oxidation tower. Compressed air is fed from the bottom of the oxidation tower, hydrogenated liquid is fed from the top of the oxidation tower, technical-grade hydrogen peroxide is fed from the middle and lower part of the oxidation tower, oxidized liquid is discharged from the bottom of the oxidation tower, oxidation tail gas is discharged from the top of the oxidation tower, and hydrogen peroxide is discharged from the bottom of the oxidation tower.

[0018] The oxidation tower is equipped with a built-in cooler and a gas and liquid redistributor.

[0019] The oxidizing liquid is discharged from the bottom of the oxidation tower and enters the oxidizing liquid receiving tank. The oxidizing liquid in the receiving tank is then pumped into the bottom of the extraction tower by a centrifugal pump.

[0020] The pure water and oxidizing liquid are extracted countercurrently in the extraction tower. The raffinate flows out from the top of the extraction tower, and the crude hydrogen peroxide flows out from the bottom of the extraction tower.

[0021] The hydrogen peroxide outlet at the bottom of the purification tower I is first connected to the coalescer, then connected to the centrifugal pump inlet, the centrifugal pump outlet is connected to the preheater, and the preheater outlet is connected to the hydrogen peroxide inlet of the falling film evaporator.

[0022] The hydrogen peroxide outlet at the bottom of the falling film evaporator is connected to the cooler via a centrifugal pump, and the hydrogen peroxide pipeline at the cooler outlet is connected to the lower part of the oxidation tower.

[0023] The hydrogen peroxide outlet pipe at the bottom of the oxidation tower is connected to the upper part of purification tower II, and the aromatic hydrocarbon pipe is connected to the lower part of purification tower II.

[0024] The centrifugal pump outlet is also connected to the feed line of the falling film evaporator.

[0025] The steam outlet pipeline of the distillation column is connected to a steam jet pump.

[0026] The falling film evaporator described above can also directly use steam as a heat source.

[0027] The non-condensable gas in the distillation column is cooled by the in-column cooler, and the gas phase outlet pipeline is connected to the inlet of the top condenser of the distillation column. The outlet of the top condenser of the distillation column is connected to a vacuum pump, and the non-condensable gas is discharged through the vacuum pump.

[0028] The hydrogen peroxide device-grade product purification method includes purification tower I and purification tower II, which are used to purify the crude dilute hydrogen peroxide from the extraction tower and the crude concentrated hydrogen peroxide from the oxidation tower, respectively.

[0029] Application of technical-grade hydrogen peroxide product purification methods in hydrogen peroxide plants:

[0030] The hydrogenated liquid from the hydrogenation process is introduced from the top of the oxidation tower, while compressed air is introduced from the bottom. The resulting oxidized liquid, obtained through countercurrent oxidation, contains 0.1–1.5% (mass fraction) of hydrogen peroxide. After being buffered in an oxidation liquid receiving tank, the oxidized liquid is pressurized by a centrifugal pump and then subjected to countercurrent extraction with pure water in an extraction tower to obtain a 25–40% (mass fraction) crude hydrogen peroxide solution and raffinate. The crude hydrogen peroxide is then extracted with aromatics in purification tower I to obtain a 25%–40% dilute industrial-grade hydrogen peroxide solution. Hydrogen peroxide extracted with aromatics enters the coalescer from the bottom outlet of purification tower I. In the coalescer, aromatics are separated, and a portion is produced as 25-40% industrial-grade dilute hydrogen peroxide. The remaining portion is pressurized by a centrifugal pump and heated in a preheater before entering a falling film evaporator. The bottom of the falling film evaporator contains approximately 50-60% technical-grade hydrogen peroxide, while the middle and lower sections contain 18-30% hydrogen peroxide. The lower portion of this hydrogen peroxide enters the distillation tower. The 50-60% technical-grade hydrogen peroxide from the bottom of the falling film evaporator is then circulated by a pump, with a portion entering a circulating cooler for cooling. It then enters the oxidation tower from the lower part of the oxidation tower, where it is purified and exits from the bottom. It then enters purification tower II from the top, where it is purified to obtain a 50-65% concentrated industrial-grade product. The remaining hydrogen peroxide is returned to the inlet of the falling film evaporator. The hydrogen peroxide from the falling film evaporator is distilled in a distillation column to concentrate it, yielding chemical-grade hydrogen peroxide with a weight concentration of 50-60% and a total carbon (TOC) of 10-50 ppm (by weight).

[0031] The residence time in the oxidation tower is 10-20 min, and the weight ratio of compressed air to oxidizing liquid is 0.03-0.08. The oxidation tower temperature is 30-55℃, and the operating pressure is 0.05-0.6 MPa.G. 3-10 sieves are redistributed within the oxidation tower.

[0032] The extraction tower has a theoretical number of 5 to 50 plates, and the weight ratio of demineralized water to oxidizing liquid is 0.005 to 0.02. The extraction tower temperature is 45 to 55°C, and the operating pressure is atmospheric pressure. The water content of the raffinate at the top of the extraction tower is 0.15 to 0.5%.

[0033] The theoretical number of trays in purification towers I and II is 3 to 15, and the weight ratio of aromatics to crude hydrogen peroxide is 0.03 to 0.05. The temperature of purification towers I and II is 20 to 40°C, and the operating pressure is atmospheric pressure.

[0034] The falling film evaporator has a temperature of 55~60℃ and an operating pressure of -0.092~-0.095MPa (gauge pressure). The weight ratio of hydrogen peroxide returned from the bottom of the falling film evaporator to the oxidation tower to the chemical-grade hydrogen peroxide collected from the distillation tower is (1:2)~5. The operating temperature of the top of the distillation tower is 40~45℃ and the operating pressure is -0.092~-0.095MPa (gauge pressure).

[0035] The steam evaporated from the distillation column is pressurized by an evaporation jet pump and used as a heat source for the falling film evaporator. The evaporation jet pump uses medium-pressure steam.

[0036] The non-condensable gas in the distillation column is cooled by the internal cooler, then condensed in the top condenser before being discharged by the vacuum pump.

[0037] The invented hydrogen peroxide purification method, compared to existing technologies, reduces the need for adsorption towers and improves device safety. However, the adsorption process necessitates adsorbent regeneration, which requires the use of methanol and alkalis, generating large amounts of waste liquid and wastewater. Furthermore, the adsorbent needs replacement at certain intervals, resulting in hazardous solid waste. During adsorption tower regeneration, the resin adsorbs high concentrations of hydrogen peroxide; if not replaced promptly, this can easily lead to hydrogen peroxide decomposition and accidents causing overheating and overpressure.

[0038] In this invention, instead of using an adsorption process, a portion of the concentrated hydrogen peroxide is returned to the oxidation and purification towers. The total carbon in the hydrogen peroxide is removed using aromatic extraction technology. Since the total carbon removed during the adsorption process contains more than 50% of the effective components ethylanthraquinone and tetrahydroethylanthraquinone in the working solution, these effective components are returned to the working solution through aromatic extraction in this invention, which can reduce the consumption of ethylanthraquinone in hydrogen peroxide production.

[0039] In this invention, total carbon impurities in hydrogen peroxide can be removed during the regeneration of the working fluid. This reduces investment and improves product purity, eliminating the need for technical-grade hydrogen peroxide production and increasing the yield of high-purity hydrogen peroxide. Attached Figure Description

[0040] Figure 1 Schematic diagram of the technical-grade hydrogen peroxide product purification device of this invention

[0041] In the diagram: 1-Oxidation tower, 2-Oxidation liquid receiving tank, 3-Centrifugal pump, 4-Extraction tower, 5-Purification tower I, 6-Coalescer, 7-Centrifugal pump, 9-Preheater, 10-Falling film evaporator, 11-Centrifugal pump, 12-Ejector pump, 13-Distillation tower, 14-Cooler, 15-Cooler, 16-Condenser, 17-Vacuum pump, 18-Purification tower II

[0042] Figure 2 - Schematic diagram of an existing hydrogen peroxide purification system for high-tech hydrogen peroxide products.

[0043] In the diagram: 1-Oxidation tower, 2-Oxidation liquid receiving tank, 3-Centrifugal pump, 4-Extraction tower, 19-Purification tower, 6-Coalescer, 7-Centrifugal pump, 8-Adsorption tower, 9-Preheater, 10-Falling film evaporator, 11-Centrifugal pump, 12-Ejector pump, 13-Distillation tower, 14-Cooler, 15-Cooler, 16-Condenser, 17-Vacuum pump Detailed Implementation

[0044] The present invention will be further described below with reference to the accompanying drawings: Example

[0045] Appendix Figure 1 The technical-grade hydrogen peroxide product purification device shown is mainly composed of an oxidation tower (1), an oxidation liquid receiving tank (2), a centrifugal pump (3), an extraction tower (4), a purification tower I (5), a coalescer (6), a centrifugal pump (7), a preheater (9), a falling film evaporator (10), a centrifugal pump (11), a jet pump (12), a distillation tower (13), a cooler (14), a cooler (15), a condenser (16), a vacuum pump (17), and a purification tower II (18).

[0046] The hydrogenated liquid from the hydrogenation process reacts with compressed air in a countercurrent oxidation tower to generate an oxidized liquid containing 0.1–1.5% hydrogen peroxide (mass fraction). The residence time in the oxidation tower is 15 min, and the weight ratio of compressed air to oxidized liquid is 0.03–0.08. The oxidation tower temperature is 30–55℃, and the operating pressure is 0.05–0.6 MPa.G.

[0047] After being buffered in an oxidation tank, the oxidizing solution is pressurized by a centrifugal pump and then countercurrently extracted with pure water in an extraction tower to obtain a 25-40% (mass fraction) crude hydrogen peroxide solution and raffinate. The extraction tower has a theoretical number of 20 plates, and the weight ratio of demineralized water to oxidizing solution is 0.005-0.02. The extraction tower temperature is 45-55℃, and the operating pressure is atmospheric pressure. The water content of the raffinate at the top of the extraction tower is 0.15-0.5%.

[0048] The crude hydrogen peroxide with a concentration of 25-40% and a TOC of 200-800 ppm, delivered from the extraction tower, enters purification tower I at the top. Aromatics enter purification tower I from the bottom. Purification tower I has 13 theoretical trays, and the weight ratio of aromatics to crude hydrogen peroxide is 0.03-0.05. The purification tower temperature is 20-40℃, and the operating pressure is atmospheric pressure.

[0049] After passing through purification tower I, the hydrogen peroxide exiting from the bottom of purification tower I has a TOC of 100~350ppm. After the organic matter is separated in the coalescer, 25%-40% industrial-grade dilute hydrogen peroxide is obtained. Part of this is sent to users, and the rest is pressurized by a centrifugal pump and preheated to 33~38℃ in a preheater. It is then sent to a falling film evaporator for heating at 75~80℃, using medium-pressure steam to drive the evaporative jet pump as the heat source. The concentration at the bottom of the falling film evaporator is 18~3%. 0% hydrogen peroxide with a TOC of 50-100 ppm is sent to the distillation column for rectification. Technical-grade hydrogen peroxide with a concentration of approximately 60% and a TOC of 100-300 ppm is collected from the bottom of the falling film evaporator. After being cooled by a circulating cooler, it is returned to the lower part of the oxidation tower for initial purification. The purified hydrogen peroxide then exits from the bottom of the oxidation tower and enters purification tower II, yielding industrial-grade concentrated hydrogen peroxide with a concentration of approximately 60-65% and a TOC of 10-50 ppm. The ratio of hydrogen peroxide collected from the lower part to that collected from the bottom is 3:1. The falling film evaporator temperature is 55-60℃, and the operating pressure is -0.092 to -0.095 MPa (gauge pressure).

[0050] The distillation process involves concentration in a distillation column. The resulting vapor is pressurized by an evaporative jet pump and used as a heat source for the falling film evaporator. After concentration, chemical-grade hydrogen peroxide with a concentration of 50-60% and a TOC content of 10-30 ppm is obtained. After cooling in a cooler, it is delivered to the user. The operating temperature at the top of the distillation column is 40-45℃, and the operating pressure is -0.092 to -0.095 MPa (gauge pressure).

[0051] The results show that compared with existing technologies, it can reduce waste liquid by 0.71 kg / ton and waste adsorbent by 0.04 kg / ton, and also reduce ethyl anthraquinone consumption by 5-15%. At the same time, it increases the production of high-concentration industrial-grade hydrogen peroxide without producing technical-grade hydrogen peroxide as a byproduct.

[0052] Appendix Figure 2The hydrogen peroxide purification device shown mainly consists of an oxidation tower (1), an oxidation liquid receiving tank (2), a centrifugal pump (3), an extraction tower (4), a purification tower (19), a coalescer (6), a centrifugal pump (7), an adsorption tower (8), a preheater (9), a falling film evaporator (10), a centrifugal pump (11), a jet pump (12), a distillation tower (13), a cooler (14), a cooler (15), a condenser (16), and a vacuum pump (17).

[0053] The hydrogenated liquid from the hydrogenation process reacts with compressed air in a countercurrent oxidation tower to generate an oxidized liquid containing 0.1–1.5% hydrogen peroxide (mass fraction). The residence time in the oxidation tower is 15 min, and the weight ratio of compressed air to oxidized liquid is 0.03–0.08. The oxidation tower temperature is 30–55℃, and the operating pressure is 0.05–0.6 MPa.G.

[0054] After being buffered in an oxidation tank, the oxidizing solution is pressurized by a centrifugal pump and then countercurrently extracted with pure water in an extraction tower to obtain a 25-40% (mass fraction) crude hydrogen peroxide solution and raffinate. The extraction tower has a theoretical number of 20 plates, and the weight ratio of demineralized water to oxidizing solution is 0.005-0.02. The extraction tower temperature is 45-55℃, and the operating pressure is atmospheric pressure. The water content of the raffinate at the top of the extraction tower is 0.15-0.5%.

[0055] The crude hydrogen peroxide with a concentration of 25-40% and a TOC of 200-800 ppm, delivered from the extraction tower, enters the purification tower at the top. Aromatics enter the purification tower from the bottom. The purification tower has 13 theoretical plates, and the weight ratio of aromatics to crude hydrogen peroxide is 0.03-0.05. The purification tower temperature is 20-40℃, and the operating pressure is atmospheric pressure.

[0056] After passing through the purification tower, the hydrogen peroxide exiting from the bottom of the tower has a TOC of 100-350 ppm. It then enters the coalescer to separate organic matter, yielding 25%-40% industrial-grade dilute hydrogen peroxide. Part of this is sent to users, while the rest is pressurized by a centrifugal pump and preheated to 33-38°C in a preheater. It is then sent to a falling film evaporator for heating at 75-80°C, using medium-pressure steam to drive the evaporation jet pump as the heat source. The hydrogen peroxide at the bottom of the falling film evaporator, with a concentration of 18-30% and a TOC of 50-100 ppm, is sent to a distillation column for rectification. Technical-grade hydrogen peroxide with a concentration of approximately 60% and a TOC of 100-300 ppm is collected from the bottom of the falling film evaporator. After cooling in a circulating cooler, it is sent to a resin tower for adsorption, yielding industrial-grade concentrated hydrogen peroxide with a concentration of approximately 60% and a TOC of 10-50 ppm. The ratio of hydrogen peroxide collected from the bottom to the top is 3:1. The temperature of the falling film evaporator is 55~60℃, and the operating pressure is -0.092~-0.095MPa (gauge pressure).

[0057] The distillation process involves concentration in a distillation column. The resulting vapor is pressurized by an evaporative jet pump and used as a heat source for the falling film evaporator. After concentration, chemical-grade hydrogen peroxide with a concentration of 50-60% and a TOC content of 10-30 ppm is obtained. After cooling in a cooler, it is delivered to the user. The operating temperature at the top of the distillation column is 40-45℃, and the operating pressure is -0.092 to -0.095 MPa (gauge pressure).

[0058] Because of the adsorption decarbonization technology used, the adsorption tower needs to be regenerated with methanol and alkali after 500-800 hours of operation. Regeneration generates organic waste liquid, and the adsorbent needs to be replaced after a certain number of cycles. Producing one ton of hydrogen peroxide (27.5% concentration) generates 0.71 kg of regeneration waste liquid (continuous production rate) and 0.04 kg of waste adsorbent (continuous production rate).

Claims

1. A technical-grade hydrogen peroxide product purification device, mainly composed of an oxidation tower (1), an extraction tower (4), a purification tower I (5), a falling film evaporator (10), a distillation tower (13), and a purification tower II (18). The hydrogenated liquid pipeline is connected to the upper part of the oxidation tower, the oxidation tail gas pipeline is connected to the top of the oxidation tower, the compressed air pipeline is connected to the lower part of the oxidation tower, the oxidation liquid outlet at the lower part of the oxidation tower is connected to the oxidation liquid receiving tank (2), the oxidation liquid receiving tank (2) is connected to the inlet of a centrifugal pump, the outlet of the centrifugal pump is connected to the lower part of the extraction tower, the hydrogen peroxide outlet at the bottom of the oxidation tower is connected to the upper part of the purification tower II, the aromatic hydrocarbon pipeline is connected to the lower part of the purification tower II; the pure water pipeline is connected to the extraction tower II. The upper part of the tower is connected, the raffinate pipeline is connected to the upper part of the extraction tower, the crude dilute hydrogen peroxide pipeline at the bottom of the extraction tower is connected to the upper part of the purification tower I, and the aromatic hydrocarbon pipeline is connected to the lower part of the purification tower I; the hydrogen peroxide outlet at the bottom of the purification tower I is connected to the coalescer (6), the hydrogen peroxide outlet of the coalescer is connected to the hydrogen peroxide inlet of the falling film evaporator (10), the hydrogen peroxide outlet at the bottom of the falling film evaporator is connected to the lower part of the distillation tower, the hydrogen peroxide outlet at the bottom of the falling film evaporator is connected to the middle and lower part of the oxidation tower, the gas phase outlet at the top of the distillation tower is connected to the condenser at the top of the distillation tower, the gas phase outlet of the condenser at the top of the distillation tower is connected to the vacuum pump (17), and the hydrogen peroxide outlet at the bottom of the distillation tower is connected to the chemical grade hydrogen peroxide cooler.

2. The technical-grade hydrogen peroxide product purification device according to claim 1, characterized in that... The oxidation tower (1) is equipped with a built-in cooler and a gas and liquid redistributor inside the oxidation tower (1).

3. The technical-grade hydrogen peroxide product purification device according to claim 1, characterized in that... The oxidizing liquid is discharged from the bottom of the oxidation tower (1) and enters the oxidizing liquid receiving tank (2). The oxidizing liquid in the oxidizing liquid receiving tank (2) enters the bottom of the extraction tower through a centrifugal pump.

4. The technical-grade hydrogen peroxide product purification device according to claim 1, characterized in that... Pure water and oxidizing liquid are extracted countercurrently in the extraction tower (4), the raffinate flows out from the top of the extraction tower (4), and the crude hydrogen peroxide flows out from the bottom of the extraction tower (4).

5. The technical-grade hydrogen peroxide product purification device according to claim 1, characterized in that... The hydrogen peroxide outlet at the bottom of purification tower I (5) is first connected to the coalescer (6), and after passing through the coalescer (6), it is connected to the centrifugal pump inlet. The centrifugal pump outlet is connected to the preheater (9), and the preheater outlet is connected to the hydrogen peroxide inlet of the falling film evaporator (10).

6. The technical-grade hydrogen peroxide product purification device according to claim 1, characterized in that... The hydrogen peroxide outlet at the bottom of the falling film evaporator is connected to the cooler (15) via a centrifugal pump, and the hydrogen peroxide pipeline at the outlet of the cooler (15) is connected to the lower part of the oxidation tower (1).

7. The technical-grade hydrogen peroxide product purification device according to claim 1, characterized in that... The hydrogen peroxide outlet pipe at the bottom of the oxidation tower (1) is connected to the upper part of the purification tower II (18), and the aromatic hydrocarbon pipe is connected to the lower part of the purification tower II (18).

8. The technical-grade hydrogen peroxide product purification device according to claim 1, characterized in that... The centrifugal pump outlet, which is connected to the hydrogen peroxide outlet at the bottom of the falling film evaporator, is also connected to the feed line of the falling film evaporator (10).

9. The technical-grade hydrogen peroxide product purification device according to claim 1, characterized in that... The steam outlet pipeline of the distillation column (13) is connected to the steam jet pump (12).

10. The technical-grade hydrogen peroxide product purification device according to claim 1, characterized in that... After the non-condensable gas in the distillation column (13) is cooled by the in-column cooler, the gas phase outlet pipeline is connected to the inlet of the distillation column top condenser (16), and the outlet of the distillation column top condenser (16) is connected to the vacuum pump (17). The non-condensable gas is discharged through the vacuum pump (17).

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