WO2023284027A1 - Tower-type enhanced oxidation system and method for preparing hydrogen peroxide - Google Patents

Abstract

A tower-type enhanced oxidation system for preparing hydrogen peroxide, the system comprising an oxidation tower (1), wherein a side face of the oxidation tower (1) is provided with a liquid-phase pipe (11), which is used for conveying hydrogenated anthraquinone, and a gas-phase pipe (12), which is used for conveying air; the oxidation tower (1) is internally provided with multiple hybrid micro-interface generator units (13); the hybrid micro-interface generator units (13) are sequentially arranged from top to bottom; and each hybrid micro-interface generator unit (13) comprises an upper micro-interface generator (131) and a lower micro-interface generator (132), which are connected to form one piece, a gas-liquid emulsion channel (133) is provided between the upper micro-interface generator (131) and the lower micro-interface generator (132), and the gas-liquid emulsion channel (133) is connected to a gas-liquid emulsion outlet, which is closely attached to an upper side wall of the lower micro-interface generator (132). The enhanced oxidation system can improve the utilization rate of oxygen.

Description

A tower type enhanced oxidation system and method for preparing hydrogen peroxide technical field

The invention relates to the field of hydrogen peroxide preparation, in particular to a tower-type enhanced oxidation system and method for preparing hydrogen peroxide.

Background technique

Hydrogen peroxide is an aqueous solution of hydrogen peroxide (H ₂ O ₂ ), which is an important inorganic peroxide. It has the characteristics of oxidation, bleaching, and environmental protection during use. Treatment, medical treatment, metallurgy, military industry, food processing and other fields, as oxidizing agent, bleaching agent, disinfectant, polymer initiator and crosslinking agent, propellant, etc. With the increasingly stringent environmental protection regulations, the production capacity of propylene oxide, green caprolactam and other products by the hydrogen peroxide direct oxidation method (HPPO method) has increased, resulting in a strong market demand for H ₂ O ₂ .

The production methods of hydrogen peroxide include anthraquinone method, electrolysis method, isopropanol oxidation method, inorganic reaction method, direct synthesis method of hydrogen and oxygen, etc. Among them, the anthraquinone method is the mainstream method for producing hydrogen peroxide at home and abroad.

The anthraquinone hydrogen peroxide production process uses 2-ethylanthraquinone (EAQ) as a carrier, heavy aromatics (AR) and trioctyl phosphate (TOP) as a mixed solvent, and is formulated into a solution (working solution) with a certain composition , under the catalysis of palladium or nickel catalysts, the catalytic hydrogenation and air oxidation of alkylanthraquinones are alternately carried out, and the hydrogen peroxide generated by oxidation is extracted with water to form crude hydrogen peroxide, and the alkylanthraquinones can be recycled. However, in the current process, the utilization rate of oxygen in the oxidation process is relatively low, resulting in a relatively low yield of the prepared hydrogen peroxide.

In view of this, the present invention is proposed.

Contents of the invention

The first object of the present invention is to provide a tower-type enhanced oxidation system for preparing hydrogen peroxide. The tower-type enhanced oxidation system is equipped with a mixed micro-interface unit inside the oxidation tower, so that the air is broken before the oxidation reaction between the air and hydrogenated anthraquinone Micro-bubbles increase the mass transfer area of the phase boundary between air and hydrogenated anthraquinone, thereby solving the problem of low oxygen utilization rate and low product yield in the prior art because air and hydrogenated anthraquinone cannot be fully mixed inside the oxidation tower. low problem.

The second object of the present invention is to provide a method for preparing hydrogen peroxide using a tower-type enhanced oxidation system. The hydrogen peroxide obtained by the reaction has high purity and is widely used.

In order to realize the above-mentioned purpose of the present invention, special adopt following technical scheme:

The invention provides a tower-type enhanced oxidation system for preparing hydrogen peroxide, comprising: an oxidation tower; the side of the oxidation tower is provided with a liquid-phase pipeline for transporting hydrogenated anthraquinone, and a gas-phase pipeline for transporting air;

There are multiple groups of mixed micro-interface generator units arranged in the oxidation tower, and the mixed micro-interface generator units are arranged sequentially from top to bottom, and each group of mixed micro-interface generator units includes an upper-mounted micro-interface generating unit connected as a whole. device and a lower-mounted micro-interface generator, a gas-liquid emulsion channel is arranged between the upper-mounted micro-interface generator and the lower-mounted micro-interface generator, and the gas-liquid emulsion channel is connected with a gas-liquid emulsion outlet , the gas-liquid emulsion outlet is close to the upper side wall of the down-mounted micro-interface generator.

In the tower-type enhanced oxidation system of the present invention, the raw materials are hydrogenated anthraquinone and air, and hydrogenated anthraquinone is a product obtained by hydrogenation in a hydrogenation tower. Liquid and catalyst, while sending hydrogen to the hydrogenation tower to generate a mixture containing 2-ethylhydroanthraquinone solution, the mixture is subsequently filtered and cooled, then sent to the oxidation tower, and dispersed and broken through the micro-interface in the oxidation tower The air forms a gas-liquid emulsion and undergoes an oxidation reaction to generate a mixture containing 2-ethylanthraquinone and hydrogen peroxide, which is transported to the extraction tower. The mixture containing 2-ethylanthraquinone and hydrogen peroxide is mixed with pure water in the Extraction is carried out in the extraction tower, and the product obtained after extraction is hydrogen peroxide.

In the solution of the present invention, by setting a mixed micro-interface generator unit in the oxidation tower, the utilization rate of the air is improved, and then the production rate of the product hydrogen peroxide is increased. The mixed micro-interface generator unit passes the micro-interface generator through a specific The structure is combined together, which includes an upper-mounted micro-interface generator and a lower-mounted micro-interface generator. The two need to be combined as a whole and not set up separately. The reason for this setting is to improve the firmness of the entire micro-interface unit. The space in the oxidation tower itself is relatively narrow. If the micro-interface generators are set too scattered, it will also affect the normal operation of the oxidation tower. In addition, the overall structure also shortens the distance between each micro-interface generator and strengthens the relationship between each component. The ability to cooperate with each other, after the bubbles broken by the micro-interface collide with each other, the effect of dispersion and crushing is improved.

In addition, in the solution of the present invention, the upper-mounted micro-interface generator and the lower-mounted micro-interface generator are connected as a whole through the gas-liquid emulsion channel, and the gas-liquid emulsion channel is directly connected to the gas-liquid emulsion outlet, The outlet of the gas-liquid emulsion is the outlet of the gas-liquid emulsion formed after the dispersion and crushing of the top-mounted micro-interface generator. Because the upper part of the oxidation tower belongs to the mixing zone and the lower part belongs to the violent reaction zone, the material mixing in the upper part is relatively stable. , the reaction in the lower part is more severe, then the length of the gas-liquid emulsion channel set on the upper part can be slightly shorter, and the gas-liquid emulsion channel in the lower part can be slightly longer, through the guiding effect of the gas-liquid emulsion channel, give the gas-liquid emulsion The material coming out of the outlet provides power, and the outlet of the gas-liquid emulsion is just close to the upper side wall of the lower-mounted micro-interface generator, so that the gas-liquid emulsion from the outlet immediately acts on the lower-mounted micro-interface generator, Improve the effect of dispersion and crushing. In addition, the outlet can be set in a horizontal direction or a vertical upward direction. The horizontal direction is directly sprayed out, and the vertical upward direction is equivalent to setting a 180-degree return bend at the outlet, thereby further improving the circulation of the gas-liquid emulsion. The energy can also drive the materials with poor mixing effect in the upper part to be back-mixed and then crushed. Although the gas-liquid emulsion outlet of the present invention is not clearly shown in the figure, its specific structure has been described in detail in the text part.

Preferably, there are two sets of mixed micro-interface generator sets (SBBS), because such a set is responsible for gas-liquid mixing, and one set is responsible for oxidation reaction, which just meets the actual needs. In the mixed micro-interface generator unit of each group, the upper-mounted micro-interface generator is a gas-liquid linkage micro-interface generator or a hydraulic micro-interface generator, and the lower-mounted micro-interface generator is a pneumatic micro-interface generator. The broken gas phase of the pneumatic micro-interface generator disperses from the holes on the wall and interacts with the gas-liquid emulsion from the top-mounted micro-interface generator to enhance the effect of dispersion, fusion and collision. And the gas-liquid emulsion outlet of the mixed micro-interface generator unit in the upper group can be designed to be along the horizontal direction, and the gas-liquid emulsion outlet of the mixed micro-interface generator unit in the lower group can be designed to be vertically upward. Because the lower part belongs to the reaction zone, in order to improve the reaction effect, the gas-liquid emulsion sprayed out will further improve the mixing effect with the materials in the upper region, improve the reaction effect, and then improve the utilization rate of raw materials. By adopting the specific method of the present invention After the structure of the oxidation tower is operated, the conversion rate of hydrogenated anthraquinone can reach more than 98%, the product yield can reach more than 98%, and the oxygen utilization rate can reach more than 99%, basically without any waste.

In the solution of the present invention, there is generally one liquid phase pipeline, which directly extends into the side wall of the oxidation tower, and is generally located in the middle of the oxidation tower, and the gas phase pipeline is preferably divided into multiple branches connected to the upper micro-interface The generator and the lower-mounted micro-interface generator are used to pass air into the micro-interface generator. When the upper-mounted type is a hydraulic micro-interface generator, the gas phase may not be introduced. When the upper-mounted type is a gas-liquid linkage type micro-interface generator When the gas phase needs to be introduced from the top, the bottom-mounted micro-interface generator is generally a pneumatic type, so the air needs to be directly introduced through the branched gas phase pipeline.

Preferably, the gas-liquid linkage micro-interface generator or hydraulic micro-interface generator is connected with a liquid phase circulation pipeline, and a circulation pump is arranged on the liquid phase circulation pipeline. In this way, the circulation pipeline can continuously entrain the gas phase by providing liquid phase power to achieve the effect of dispersion and crushing. In addition, the oxygen at the top of the oxidation tower can also be entrained by an air duct for further utilization.

Preferably, the upper-mounted micro-interface generator and the lower-mounted micro-interface generator are respectively provided with separate control valves for switching working states when the micro-interface generator is blocked. When the mounted micro-interface generator is a pneumatic micro-interface generator, the pores on the wall are easily blocked, so it can be directly cut out of the system to stop working. It is also possible to use only the top-mounted micro-interface generator to work. The pneumatic micro-interface generator can be flushed by the momentum of the upper-mounted gas-liquid emulsion channel.

Those skilled in the art can understand that the micro-interface generator used in the present invention has been embodied in the inventor's previous patents, such as application numbers CN201610641119.6, 201610641251.7, CN201710766435.0, CN106187660, CN105903425A, CN109437390A, Patents of CN205833127U and CN207581700U. The specific product structure and working principle of the micro-bubble generator (that is, the micro-interface generator) were introduced in detail in the prior patent CN201610641119.6. There is a cavity, the body is provided with an inlet communicating with the cavity, the opposite first end and second end of the cavity are open, and the cross-sectional area of the cavity is from the middle of the cavity to the first end and the second end of the cavity. The second end is reduced; the secondary broken piece is arranged at at least one of the first end and the second end of the cavity, a part of the secondary broken piece is set in the cavity, and the two ends of the secondary broken piece and the cavity are open An annular channel is formed between the through holes. The micron bubble generator also includes an inlet pipe and a liquid inlet pipe.” From the specific structure disclosed in the application document, it can be known that the specific working principle is: the liquid enters the micrometer tangentially through the liquid inlet pipe. In the bubble generator, the gas is rotated and cut at a super high speed, so that the gas bubbles are broken into micron-level micro-bubbles, thereby increasing the mass transfer area between the liquid phase and the gas phase, and the micro-bubble generator in this patent belongs to the pneumatic micro-interface generation device.

In addition, it is recorded in the prior patent 201610641251.7 that the primary bubble breaker has a circulating liquid inlet, a circulating gas inlet, and a gas-liquid mixture outlet, while the secondary bubble breaker connects the feed port with the gas-liquid mixture outlet, indicating that the bubble breaker is both It needs to be mixed with gas and liquid. In addition, it can be seen from the following drawings that the primary bubble breaker mainly uses circulating fluid as power, so in fact, the primary bubble breaker is a hydraulic micro-interface generator, and the secondary bubble breaker is a gas-liquid breaker. The mixture is passed into the elliptical rotating ball for rotation at the same time, so that the bubbles are broken during the rotation process, so the secondary bubble breaker is actually a gas-liquid linkage micro-interface generator. In fact, whether it is a hydraulic micro-interface generator or a gas-liquid linkage micro-interface generator, they all belong to a specific form of the micro-interface generator, but the micro-interface generator used in the present invention is not limited to the above-mentioned several forms The specific structure of the bubble breaker described in the prior patents is only one of the forms that the micro-interface generator of the present invention can adopt. In addition, it is recorded in the previous patent 201710766435.0 that "the principle of the bubble breaker is high-speed jet flow to achieve gas collision", and it is also explained that it can be used in micro-interface strengthening reactors to verify the relationship between the bubble breaker and the micro-interface generator. and the prior patent CN106187660 also has relevant records for the specific structure of the bubble breaker, specifically see paragraphs [0031]-[0041] in the description, and the accompanying drawings, which describe the bubble breaker S-2 The specific working principle of the bubble breaker is described in detail. The top of the bubble breaker is the liquid phase inlet, and the side is the gas phase inlet. The liquid phase coming in from the top provides the entrainment power, so as to achieve the effect of crushing into ultra-fine bubbles, which can also be seen in the attached drawings. The bubble breaker has a conical structure, and the diameter of the upper part is larger than that of the lower part, which is also for the liquid phase to provide better entrainment power.

Since the micro-interface generator was just developed in the early stage of the patent application, it was named micro-bubble generator (CN201610641119.6) and bubble breaker (201710766435.0) in the early stage. With continuous technological improvement, it was later renamed as micro-interface generator Device, now the micro-interface generator in the present invention is equivalent to the previous micro-bubble generator, bubble breaker, etc., but the name is different.

In summary, the micro-interface generator of the present invention belongs to the prior art, although some bubble breakers belong to the type of pneumatic bubble breaker, some bubble breakers belong to the type of hydraulic bubble breaker, and some belong to the type of pneumatic bubble breaker. The type of liquid-linked bubble breaker, but the difference between the types is mainly selected according to the specific working conditions. In addition, the connection between the micro-interface generator, the reactor, and other equipment, including the connection structure and connection position, depends on the micro-interface generator. It depends on the structure of the interface generator, which is not limited.

Preferably, a downcomer is provided in the oxidation tower of the present invention to overflow the upper liquid phase for use in the lower reaction zone, and a plurality of grids are also provided in the oxidation tower to improve the reaction effect.

Preferably, the oxidation tower is connected with a gas-liquid separator, the tail gas from the top of the gas-liquid separator is recovered and processed, and the product from the side wall of the gas-liquid separator continues to the extraction section. The oxygen content in the tail gas is very small, and most of it is used to synthesize products.

The present invention also provides an oxidation method of a tower-type enhanced oxidation system for preparing hydrogen peroxide, comprising the following steps:

After the air is broken into the micro-interface, it is oxidized with hydrogenated anthraquinone to generate hydrogen peroxide

Preferably, the oxidation reaction temperature is 35-60°C, preferably 45-55°C, and the reaction pressure is 0.2-0.4MPa, preferably 0.25-0.35MPa.

The hydrogen peroxide product obtained by the oxidation method of the invention has good quality and high yield. Moreover, the preparation method itself has low reaction temperature, greatly reduced pressure, and high liquid hourly space velocity, which is equivalent to increased production capacity.

Compared with prior art, the beneficial effect of the present invention is:

(1) In the present invention, a mixed micro-interface unit is set inside the oxidation tower, so that the air is broken into microbubbles before the oxidation reaction between the air and the hydrogenated anthraquinone, and the phase boundary mass transfer area between the air and the hydrogenated anthraquinone is improved, thereby It solves the problem of low oxygen utilization rate and low product yield in the prior art because air and hydrogenated anthraquinone cannot be fully mixed inside the oxidation tower;

(2) The oxidation method of the present invention is easy to operate, the hydrogen peroxide obtained by the reaction has high purity, and is widely used, which improves the applicable surface of the hydrogen peroxide itself, and is worthy of wide popularization and application.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiment. The drawings are only for the purpose of illustrating a preferred embodiment and are not to be considered as limiting the invention. Also throughout the drawings, the same reference numerals are used to designate the same parts. In the attached picture:

Fig. 1 is a schematic structural diagram of a tower-type enhanced oxidation system for preparing hydrogen peroxide provided by an embodiment of the present invention.

In the picture:

1-oxidation tower; 11-liquid pipeline;

12-Gas phase pipeline;          13-Mixed micro-interface generator unit;

131-upper micro-interface generator; 132-lower micro-interface generator;

133-gas-liquid emulsion channel; 134-control valve;

135-liquid circulation pipeline; 136-circulation pump;

14-down pipe; 15-grille;

2-gas-liquid separator; 3-air storage tank.

detailed description

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but those skilled in the art will understand that the embodiments described below are some of the embodiments of the present invention, rather than all of them. It is only used to illustrate the present invention and should not be construed as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention. Those who do not indicate the specific conditions in the examples are carried out according to the conventional conditions or the conditions suggested by the manufacturer. The reagents or instruments used were not indicated by the manufacturer, and they were all conventional products that could be purchased from the market.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In order to illustrate the technical solution in the present invention more clearly, the following will be described in the form of specific examples.

Example

Referring to Fig. 1, it is a tower-type enhanced oxidation system for preparing hydrogen peroxide according to an embodiment of the present invention, which mainly includes an oxidation tower 1, and multiple groups of mixed micro-interface generator units 13 arranged inside the oxidation tower 1. The oxidation reaction between hydrogenated anthraquinone and air produces hydrogen peroxide. In order to improve the oxidation effect, a multi-layer grid 15 is arranged in the oxidation tower 1, and a downcomer 14 for drainage is arranged on the inner wall.

This embodiment is two groups of mixed micro-interface generator sets 13, the mixed micro-interface generator sets 13 are arranged sequentially from top to bottom, and each set of mixed micro-interface generator sets 13 includes an upper-mounted micro-interface generating set connected as a whole. device 131 and a lower-mounted micro-interface generator 132, a gas-liquid emulsion channel 133 is arranged between the upper-mounted micro-interface generator 131 and the lower-mounted micro-interface generator 132, and the gas-liquid emulsion channel 133 is connected to There is a gas-liquid emulsion outlet, and the gas-liquid emulsion outlet is close to the upper side wall of the down-mounted micro-interface generator 132, and the direction of the gas-liquid emulsion outlet is along the horizontal direction or vertically upward. Examples are along the horizontal direction.

In the hybrid micro-interface generator unit 13 of each group in the embodiment of the present invention, the upper-mounted micro-interface generator 131 is a gas-liquid linkage micro-interface generator or a hydraulic micro-interface generator, and the lower-mounted micro-interface generator 132 is a pneumatic micro-interface generator. Micro-interface generator. The gas-liquid linkage type micro-interface generator or the liquid-dynamic micro-interface generator is connected with a liquid-phase circulation pipeline 135, and the liquid-phase circulation pipeline 135 is provided with a circulation pump 136, and the liquid-phase circulation pipeline 135 is used to feed the top-mounted micro-interface generator 131 provides entrainment power. Since the upper area in the oxidation tower 1 is mainly responsible for mixing, and the lower area is mainly responsible for the reaction, relatively speaking, the reaction in the lower area is more intense, and the designed gas-liquid emulsion channel 133 can be relatively longer to provide more sufficient gas-liquid phase In the mixed emulsification space, through the dispersion and crushing action of the micro-interface generator unit, the oxygen is broken into micro-bubbles of micron scale, and the bubbles are released into the inside of the oxidation tower 1, so that the air can be mixed with hydrogenated anthracene in the state of micro-bubbles Quinone full contact.

In addition, the upper-mounted micro-interface generator 131 and the lower-mounted micro-interface generator 132 are respectively provided with a separate control valve 134 to switch the working state when the micro-interface generator is blocked. The lower-mounted micro-interface generator is generally selected as The pneumatic type is relatively prone to blockage, its control valve 134 can be closed, only the upper micro-interface generator 131 is used to work alone, and the lower micro-interface generator 132 can be controlled when the upper micro-interface generator 131 is working. Rinse.

The side of the oxidation tower 1 is provided with a liquid phase pipeline 11 for transporting hydrogenated anthraquinone, and is provided with a gas phase pipeline 12 for transporting air. A micro-interface generator 132 is used to feed air into the micro-interface generator. The liquid phase pipeline 11 is a separate one, which directly extends from the middle of the oxidation tower 1 and is used to transport the hydrogenated anthraquinone raw material. The air delivered through the gas phase pipeline is stored in the air storage tank 3 .

The oxidation tower 1 is also connected with a gas-liquid separator 2, the tail gas coming out from the top of the gas-liquid separator 2 is recovered and processed, and the product coming out of the side wall of the gas-liquid separator 2 continues to the extraction section. After the product from the oxidation tower 1 goes to the gas-liquid separator 2 for gas-liquid separation, the product generated goes to the next extraction section, and the tail gas is recycled. The oxygen contained in the tail gas is not much, which illustrates the oxidation method of the present invention. Oxygen utilization is high.

In order to increase the effect of dispersion and mass transfer, additional micro-interface generators can also be added. The installation position is actually not limited. It can be external or built-in. When built-in, it can also be installed on the side wall of the kettle. In order to realize the hedging of the micro-bubbles coming out from the exit of the micro-interface.

In the above embodiments, there is no specific requirement on the number of pump bodies, which can be set at corresponding positions as required.

In this embodiment, the mass concentration of hydrogenated anthraquinone is 120g/L, the organic solvent is aromatic hydrocarbon, the constant temperature of oxidation heating is 35°C, the reaction pressure of oxidation tower 1 is 0.2MPa, and air is fed at a flow rate of 15L/min, and the reaction time is 10min After the reaction is completed, samples are taken to analyze the conversion rate and oxygen utilization rate.

The conversion rate of hydrogenated anthraquinone=reacted raw material amount/original raw material amount*100%;

Oxygen utilization rate = reacted oxygen amount/oxygen amount contained in original air*100%;

Analysis results: the conversion rate of hydrogenated anthraquinone is 98%, and the utilization rate of oxygen is 98%.

Example 2

Other operating steps are consistent with Example 1, except that the oxidation heating constant temperature is 45° C., and the reaction pressure of oxidation tower 1 is 0.25 MPa. Analysis results: the conversion rate of hydrogenated anthraquinone is 97%, and the utilization rate of oxygen is 97%.

Example 3

Other operating steps are consistent with Example 1, except that the oxidation heating constant temperature is 55° C., and the reaction pressure of oxidation tower 1 is 0.35 MPa. Analysis results: the conversion rate of hydrogenated anthraquinone is 97%, and the utilization rate of oxygen is 97%.

Comparative example 1

Other operating steps are the same as in Example 1, except that the mixed micro-interface generator unit 13 is not added. Analysis results: the conversion rate of hydrogenated anthraquinone is 90%, and the utilization rate of oxygen is 90%.

Comparative example 2

The other operating steps are consistent with Example 1, except that the mixed micro-interface generator unit 13 is replaced by a single pneumatic type micro-interface generator, and the analysis results: the conversion rate of hydrogenated anthraquinone is 97%, and the utilization rate of oxygen is 97%. .

In a word, compared with the tower-type enhanced oxidation system for preparing hydrogen peroxide in the prior art, the tower-type enhanced oxidation system of the present invention has fewer equipment components, a small footprint, low energy consumption, low cost, high safety, and controllable reaction. The high conversion rate of raw materials is equivalent to providing a more operable tower-type enhanced oxidation system for the field of hydrogen peroxide preparation, which is worthy of wide application.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (9)

1. A tower-type enhanced oxidation system for preparing hydrogen peroxide, characterized in that it includes: an oxidation tower; the side of the oxidation tower is provided with a liquid phase pipeline for transporting hydrogenated anthraquinone, and is provided with a gas phase pipeline for transporting air;

   There are multiple groups of mixed micro-interface generator units arranged in the oxidation tower, and the mixed micro-interface generator units are arranged sequentially from top to bottom, and each group of mixed micro-interface generator units includes an upper-mounted micro-interface generator unit connected as a whole. device and a lower-mounted micro-interface generator, a gas-liquid emulsion channel is arranged between the upper-mounted micro-interface generator and the lower-mounted micro-interface generator, and the gas-liquid emulsion channel is connected with a gas-liquid emulsion outlet , the gas-liquid emulsion outlet is close to the upper side wall of the down-mounted micro-interface generator.
2. The tower-type enhanced oxidation system according to claim 1, characterized in that the mixed micro-interface generator unit is divided into two groups, and in each group of mixed micro-interface generator unit, the upper-mounted micro-interface generator is a gas-liquid linkage type micro-interface generator or hydraulic micro-interface generator, and the down-mounted micro-interface generator is a pneumatic micro-interface generator.
3. The tower-type enhanced oxidation system according to claim 2, wherein the gas phase pipeline is divided into a plurality of branches connected to the upper-mounted micro-interface generator and the lower-mounted micro-interface generator respectively, so as to pass air into the micro-interface generator.
4. The tower-type enhanced oxidation system according to claim 1, characterized in that, the gas-liquid emulsion outlet is oriented horizontally or vertically upward.
5. The tower-type enhanced oxidation system according to any one of claims 1-4, characterized in that the upper-mounted micro-interface generator and the lower-mounted micro-interface generator are respectively provided with separate control valves for micro Toggles the working state when the interface generator is blocked.
6. According to the tower type enhanced oxidation system according to any one of claims 1-4, it is characterized in that, the oxidation tower is connected with a gas-liquid separator, and the tail gas from the top of the gas-liquid separator is recovered and processed from the The product coming out of the side wall of the gas-liquid separator continues to the extraction section.
7. The tower-type enhanced oxidation system according to any one of claims 2-4, characterized in that, the gas-liquid linkage micro-interface generator or the liquid-dynamic micro-interface generator is connected with a liquid phase circulation pipeline, and the liquid phase circulation A circulation pump is arranged on the pipeline.
8. Adopt the method for the tower type strengthened oxidation system of preparation hydrogen peroxide described in any one of claim 1-7, it is characterized in that, comprise the steps:

   After the air is broken into the micro-interface, it is oxidized with hydrogenated anthraquinone to generate hydrogen peroxide.
9. The oxidation method according to claim 8, characterized in that the oxidation reaction temperature is 35-60°C, preferably 45-55°C, and the reaction pressure is 0.2-0.4MPa, preferably 0.25-0.35MPa.

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