High-efficiency extraction device for producing dihydric phenols by phenol hydroxylation method

Abstract

The present application relates to the technical fields of phenolic compound preparation extraction, and discloses a high-efficiency extraction device for phenolic compound production by phenol hydroxylation method, which comprises an extraction reaction kettle for high-efficiency extraction of phenolic compound preparation, an opening and closing mechanism located above the extraction reaction kettle, a high-efficiency extraction mechanism located inside the extraction reaction kettle, and a solid-liquid separation mechanism located above the high-efficiency extraction mechanism. The high-efficiency extraction device for phenolic compound production by phenol hydroxylation method is convenient for mixing reaction of phenol solid powder to be reacted with one of sulfuric acid, nitric acid, sodium chloride, hydrogen peroxide and other liquids by rotating the clasp to cooperate with the stirring branch rod, and is convenient for phenol hydroxylation method production of phenolic compound. The reacted liquid is separated by the solid-liquid separation mechanism, the clasp is rotated to drive the crushing sharp bolt to crush the filter cake, the crushing leaves are convenient for further crushing of the filter cake, the reaction solvent is put in for further reaction and extraction, and the above steps are repeated for multiple times, so that the high-efficiency extraction of phenolic compound is realized.

Description

Technical Field

[0001] This invention relates to the field of hydroquinone preparation and extraction technology, specifically to a high-efficiency extraction device for producing hydroquinone by phenol hydroxylation. Background Technology

[0002] The phenol hydroxylation method uses phenol as a raw material, which reacts with hydrogen peroxide under the action of a catalyst to produce hydroquinone and catechol. After removing water, high-boiling substances, and phenol, and separating catechol, crude hydroquinone is obtained. Then, after dissolution, decolorization, and recrystallization, the hydroquinone product is obtained. Compared with the aniline method and the diisopropylbenzene method, the phenol hydroxylation method has a simpler reaction process and separation operation, resulting in lower energy consumption and less pollution. In addition, the co-produced catechol is also an extremely important fine chemical product, serving as an intermediate for vanillin, artificial musk, and pharmaceuticals, pesticides, and dyes. It can also be used directly as a polymerization inhibitor and antioxidant, making the phenol hydroxylation process highly favored.

[0003] In existing technologies, such as the Chinese patent announcement CN112645799B entitled "A Post-processing Process for Resorcinol," the reaction solution containing resorcinol is cooled to room temperature and filtered to obtain filtrate I; the filter cake is washed with ethyl acetate or anhydrous ethanol, and the washing liquid is combined with filtrate I; after the solvent is evaporated from filtrate I, the substrate is acidified to obtain mixture I; mixture I is extracted with an extractant to obtain an extract, which is then washed with water and the organic solvent is removed under reduced pressure to obtain a purified resorcinol product. The reaction solution described in this invention is prepared by adding 3-hydroxybenzoic acid and a reaction solvent to a high-pressure reactor and adding a catalyst to catalyze the reaction. The post-processing process described in this invention is simple, highly operable, and yields a high-quality resorcinol product with a purity of over 99.8%.

[0004] In the aforementioned patent, although the filter cake is washed with ethyl acetate or anhydrous ethanol and the washing liquid is combined with filtrate I, only one reaction is carried out during preparation. The internal raw material reaction is not thorough enough, and the filter cake is solid, so it is easy to leave residues during washing, which affects the accuracy of extraction. Therefore, there is an urgent need for a high-efficiency extraction device for producing hydroquinone by phenol hydroxylation. Summary of the Invention

[0005] The purpose of this invention is to provide a highly efficient extraction device for producing hydroquinone by phenol hydroxylation, in order to solve the problems mentioned in the background art, which involve only one reaction during preparation, insufficient reaction of raw materials, and solid filter cake that is prone to residue during rinsing, thus affecting the accuracy of extraction.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-efficiency extraction device for producing hydroquinone by phenol hydroxylation, comprising:

[0007] An extraction reactor used for efficient extraction in the preparation of hydroquinone;

[0008] An opening and closing mechanism is located above the extraction reactor;

[0009] A high-efficiency extraction mechanism is located inside the extraction reactor. The high-efficiency extraction mechanism includes a rotating retaining ring. Stirring rods are uniformly arranged on the inner wall of the rotating retaining ring. A connecting shaft is linearly distributed at the bottom of the stirring rod. Broken blades are evenly distributed in an alternating pattern on the outer periphery of the connecting shaft. Broken tip bolts are annularly distributed at the bottom of the rotating retaining ring.

[0010] A solid-liquid separation mechanism is located above the high-efficiency extraction mechanism. The solid-liquid separation mechanism includes an electric cylinder. A limit plate is provided at the bottom end of the piston rod of the electric cylinder. An extraction screen is provided below the limit plate. A separation filter screen is snapped onto the top of the extraction screen.

[0011] As a preferred embodiment of the present invention, the opening and closing mechanism includes a limiting retaining ring, and an opening and closing cover plate adapted to the top opening of the extraction reactor is slidably arranged between the limiting retaining rings. Magnetic suction sliders adapted to the limiting retaining rings are symmetrically arranged on both sides of the opening and closing cover plate, and an auxiliary handle is provided on one side of the opening and closing cover plate.

[0012] As a preferred embodiment of the present invention, the top of the limiting ring is symmetrically provided with a fixing groove, the inner wall of the fixing groove is engaged with the connecting cover plate, the two sides of the connecting cover plate are symmetrically provided with limiting support plates, and the opening and closing cover plates are symmetrically provided on the outer walls of the other two sides of the connecting cover plate.

[0013] As a preferred embodiment of the present invention, a cross-shaped locking block is provided on the outer periphery of the piston rod of the electric cylinder, and symmetrically opening limiting slots are provided on the limiting pressure plate. A connecting cover is provided at the bottom of the cross-shaped locking block, and the connecting cover is symmetrically arranged at the bottom of the inner wall of the extraction pressure screen.

[0014] As a preferred embodiment of the present invention, the bottom of the connecting cover is provided with a sliding opening adapted to the limiting pressure plate, and the limiting pressure plate is slidably engaged with the connecting cover by providing the sliding opening.

[0015] As a preferred embodiment of the present invention, the top of the connecting cover is provided with a cross-shaped locking hole adapted to the cross-shaped locking block, and the cross-shaped locking hole is connected to the sliding opening. The cross-shaped locking block is fixed to the connecting cover by the cross-shaped locking hole.

[0016] As a preferred embodiment of the present invention, the inner wall of the connecting cover is provided with a limiting plate that is adapted to the limiting slot, and the limiting pressure plate is slidably engaged with the limiting plate by the limiting slot.

[0017] As a preferred embodiment of the present invention, a drive shaft is provided at the top of the stirring support rod, the top end of the drive shaft is connected and fixed to the drive end of the AC motor, and the AC motor is located at the top of the connecting cover plate.

[0018] As a preferred embodiment of the present invention, the outer walls of the extraction reactor are symmetrically provided with fixed base plates adapted to the limiting support plates, and a lifting cylinder is provided between the fixed base plates and the limiting support plates.

[0019] As a preferred embodiment of the present invention, the electric cylinders are symmetrically arranged on the connecting cover plate, and the inner wall of the extraction pressure screen and the separation filter screen is rotatably provided with a transmission shaft.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. This high-efficiency extraction device for producing hydroquinone by phenol hydroxylation uses a rotating retaining ring in conjunction with a stirring rod to facilitate the mixing and reaction of the phenol solid powder with one of the liquids such as sulfuric acid, nitric acid, sodium chloride, or hydrogen peroxide. This facilitates the production of hydroquinone by phenol hydroxylation. The reacted liquid is separated by a solid-liquid separation mechanism. After the solid is pressed into a cake, the filter cake is crushed by rotating the retaining ring and driving the crushing tip. The crushing blade further crushes the filter cake, making it easy to add it to the reaction solvent for further reaction and extraction. This process is repeated multiple times to achieve high-efficiency extraction of hydroquinone.

[0022] 2. This high-efficiency extraction device for producing hydroquinone by phenol hydroxylation involves an electric cylinder that slides into a sliding opening via a limiting pressure plate and is hooked and fixed to a connecting cover, facilitating the fixation of the extraction pressure screen. The limiting pressure plate is raised and lowered via a limiting slot, and a cross-shaped locking block engages with a cross-shaped locking hole to limit the connection between the piston rod and the connecting cover. When the extraction pressure screen descends to compress the extracted solids, the electric cylinder drives the limiting pressure plate to contact the extraction pressure screen. The limiting plate limits the raising and lowering of the limiting pressure plate, and the cross-shaped locking block engages with the cross-shaped locking hole. The extraction pressure screen rises and falls within the extraction reactor wall for further limiting and to prevent it from detaching. The separation filter screen of the extraction pressure screen facilitates further filtration of solid particles in the filtered liquid, thus improving the purity of the extraction.

[0023] 3. The high-efficiency extraction device for producing hydroquinone by phenol hydroxylation uses a lifting cylinder to drive the limiting support plate to rise and fall, which in turn drives the connecting cover plate to rise and fall. The fixed slot facilitates the limiting of the connecting cover plate, making it easy to lift the high-efficiency extraction mechanism and the solid-liquid separation mechanism, and facilitating the cleaning of the remaining residue inside the extraction reactor. Attached Figure Description

[0024] Figure 1This is a schematic diagram of the overall structure of a high-efficiency extraction device for producing hydroquinone by phenol hydroxylation in one embodiment of the present invention.

[0025] Figure 2 This is a cross-sectional schematic diagram of a high-efficiency extraction device for producing hydroquinone by phenol hydroxylation in one embodiment of the present invention.

[0026] Figure 3 This is a partial structural schematic diagram of a high-efficiency extraction device for producing hydroquinone by phenol hydroxylation in one embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the high-efficiency extraction mechanism of a high-efficiency extraction device for producing hydroquinone by phenol hydroxylation in one embodiment of the present invention.

[0028] Figure 5 This is a schematic diagram of the extraction reactor structure of a high-efficiency extraction device for producing hydroquinone by phenol hydroxylation in one embodiment of the present invention.

[0029] Figure 6 This is a schematic diagram of a partial explosion of the opening and closing mechanism of a high-efficiency extraction device for producing hydroquinone by phenol hydroxylation in one embodiment of the present invention.

[0030] Figure 7 This is a schematic diagram of the opening and closing mechanism, the high-efficiency extraction mechanism, and the solid-liquid separation mechanism of a high-efficiency extraction device for producing hydroquinone by phenol hydroxylation in one embodiment of the present invention.

[0031] Figure 8 This is an exploded structural diagram of the solid-liquid separation mechanism of a high-efficiency extraction device for producing hydroquinone by phenol hydroxylation in one embodiment of the present invention.

[0032] In the picture:

[0033] 1. Extraction reactor;

[0034] 2. Opening and closing mechanism; 201. Limiting retaining ring; 202. Opening and closing cover plate; 203. Magnetic slider; 204. Auxiliary handle; 205. Fixing slot; 206. Connecting cover plate; 207. Limiting support plate; 208. Fixing base plate; 209. Lifting cylinder;

[0035] 3. High-efficiency extraction mechanism; 301. Rotating retaining ring; 302. Drive shaft; 303. AC motor; 304. Stirring rod; 305. Connecting shaft; 306. Crushing blade; 307. Crushing tip;

[0036] 4. Solid-liquid separation mechanism; 401. Electric cylinder; 402. Cross-shaped locking block; 403. Limiting pressure plate; 404. Limiting slot; 405. Connecting cover; 406. Sliding opening; 407. Cross-shaped locking hole; 408. Limiting plate; 409. Extraction pressure sieve; 410. Separation filter screen. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figures 1-8 This invention provides a technical solution: a high-efficiency extraction device for producing hydroquinone by phenol hydroxylation, comprising an extraction reactor 1 for high-efficiency extraction of hydroquinone, an opening and closing mechanism 2 located above the extraction reactor 1, the opening and closing mechanism 2 including limiting rings 201, an opening and closing cover plate 202 adapted to the top opening of the extraction reactor 1 slidably disposed between the limiting rings 201, magnetic sliders 203 adapted to the limiting rings 201 symmetrically disposed on both sides of the opening and closing cover plate 202, an auxiliary handle 204 disposed on one side of the opening and closing cover plate 202, a fixing groove 205 symmetrically disposed on the top of the limiting rings 201, the inner wall of the fixing groove 205 being engaged with a connecting cover plate 206, limiting support plates 207 symmetrically disposed on both sides of the connecting cover plate 206, and the opening and closing cover plate 202 symmetrically disposed on the connecting cover plate 206. On the other two outer walls of the cover plate 206, fixed base plates 208 adapted to the limiting support plate 207 are symmetrically arranged on both sides of the outer wall of the extraction reactor 1. A lifting cylinder 209 is arranged between the fixed base plate 208 and the limiting support plate 207. The opening and closing cover plate 202 and the connecting cover plate 206 form a complete cover plate for easy control of opening and closing. The opening and closing cover plate 202 moves inside the limiting ring 201 through the magnetic slider 203, which makes it easy to open the top opening of the extraction reactor 1 by pulling the auxiliary handle 204 with external force. The lifting cylinder 209 drives the limiting support plate 207 to rise and fall, which in turn drives the connecting cover plate 206 to rise and fall. The fixed slot 205 makes it easy to limit the connecting cover plate 206, making it easy to lift the high-efficiency extraction mechanism 3 and the solid-liquid separation mechanism 4, and making it easy to clean the remaining residue inside the extraction reactor 1.

[0039] The high-efficiency extraction mechanism 3 is located inside the extraction reactor 1. The high-efficiency extraction mechanism 3 includes a rotating retaining ring 301. Stirring rods 304 are evenly arranged on the inner wall of the rotating retaining ring 301. Connecting shafts 305 are linearly distributed at the bottom of the stirring rods 304. Breaking blades 306 are evenly and alternately distributed on the outer periphery of the connecting shafts 305. Breaking tip bolts 307 are annularly distributed at the bottom of the rotating retaining ring 301. A drive shaft 302 is located at the top of the stirring rods 304. The top end of the drive shaft 302 is connected and fixed to the drive end of an AC motor 303. The AC motor 303 is located on top of the connecting cover plate 206. 3 drives the drive shaft 302 to rotate, which in turn drives the rotating retainer 301 to rotate. The rotating retainer 301, in conjunction with the stirring rod 304, facilitates the mixing and reaction of the phenol solid powder to be reacted with one of the liquids such as sulfuric acid, nitric acid, sodium chloride, or hydrogen peroxide. This facilitates the production of hydroquinone via the phenol hydroxylation method. The reacted liquid is then separated by the solid-liquid separation mechanism 4. After the solid is pressed into a cake, the rotating retainer 301 drives the crushing tip 307 to crush the filter cake. The crushing blade 306 further crushes the filter cake, making it easier to add it to the reaction solvent for further reaction and extraction. This process is repeated multiple times to achieve efficient extraction of hydroquinone.

[0040] The solid-liquid separation mechanism 4 is located above the high-efficiency extraction mechanism 3. The solid-liquid separation mechanism 4 includes an electric cylinder 401. A limiting pressure plate 403 is provided at the bottom of the piston rod of the electric cylinder 401. An extraction screen 409 is provided below the limiting pressure plate 403. A separation filter screen 410 is snapped onto the top of the extraction screen 409. The electric cylinder 401 is symmetrically arranged on the connecting cover plate 206. A drive shaft 302 is rotatably arranged between the inner walls of the extraction screen 409 and the separation filter screen 410. A cross-shaped locking block 402 is provided on the outer periphery of the piston rod of the electric cylinder 401. Limiting slots 404 are symmetrically opened on the limiting pressure plate 403. A connecting cover 405 is provided at the bottom of the cross-shaped locking block 402. The connecting covers 405 are symmetrically arranged on the extraction screen 401. At the bottom of the inner wall of 09, the bottom of the connecting cover 405 is provided with a sliding opening 406 adapted to the limiting pressure plate 403. The limiting pressure plate 403 is slidably engaged with the connecting cover 405 through the sliding opening 406. The top of the connecting cover 405 is provided with a cross-shaped locking hole 407 adapted to the cross-shaped locking block 402, and the cross-shaped locking hole 407 is connected to the sliding opening 406. The cross-shaped locking block 402 is engaged and fixed with the connecting cover 405 through the cross-shaped locking hole 407. The inner wall of the connecting cover 405 is provided with a limiting plate 408 adapted to the limiting groove 404. The limiting pressure plate 403 is slidably engaged with the limiting plate 408 through the limiting groove 404. After the hydroquinone reacts with the solvent, it needs to be solidified and liquidified. The separation mechanism facilitates the extraction of the reacted liquid via a suction tube and pump, enabling subsequent heating and purification. An electric cylinder 401 slides into a sliding opening 406 via a limiting plate 403, which is then hooked and fixed to a connecting cover 405, thus securing the extraction screen 409. The limiting plate 403 is raised and lowered via a limiting slot 404 on a limiting plate 408. A cross-shaped locking block 402 engages with a cross-shaped locking hole 407 to limit the connection between the piston rod and the connecting cover 405. When the extraction screen 409 descends to compress the extracted solid, the electric cylinder 401 drives the limiting plate 403 to contact the extraction screen 409. The limiting plate 408 limits the raising and lowering of the limiting plate 403. The cross-shaped locking block 402 engages with the cross-shaped locking hole 407, allowing the extraction pressure screen 409 to rise and fall within the inner wall of the extraction reactor 1 for further limiting and preventing it from detaching. The separation filter screen 410 of the extraction pressure screen 409 facilitates further filtration of solid particles in the filtered liquid, thus improving the purity of the extraction. The separation filter screen 410 is fixedly mounted on the piston rod of the drive shaft 302 and the electric cylinder 401. The extraction pressure screen 409 is slidably engaged with the electric cylinder 401 and engaged with the separation filter screen 410, making it easy to remove the extraction pressure screen 409 for cleaning. The rotating retaining ring 301 is located at the bottom of the extraction reactor 1, facilitating mixing without affecting the filtration of the extraction pressure screen 409, making it convenient and quick to use.

[0041] Working principle: The opening and closing cover plate 202 and the connecting cover plate 206 form a complete cover plate for easy control of opening and closing. The opening and closing cover plate 202 moves inside the limiting ring 201 via the magnetic slider 203, making it easy to open the top opening of the extraction reactor 1 by pulling the auxiliary handle 204 with external force. The lifting cylinder 209 drives the limiting support plate 207 to rise and fall, which in turn drives the connecting cover plate 206 to rise and fall. The fixing slot 205 facilitates the limiting of the connecting cover plate 206, making it easy to lift the high-efficiency extraction mechanism 3 and the solid-liquid separation mechanism 4, and to facilitate the cleaning of the remaining residue inside the extraction reactor 1. The AC motor 303 drives the drive shaft 3. 02 rotates, and the drive shaft 302 drives the rotating retaining ring 301 to rotate. The rotating retaining ring 301, together with the stirring support rod 304, facilitates the mixing and reaction of the phenol solid powder to be reacted with one of the liquids such as sulfuric acid, nitric acid, sodium chloride, and hydrogen peroxide. This facilitates the production of hydroquinone by phenol hydroxylation. The liquid after the reaction is separated by the solid-liquid separation mechanism 4. After the solid is pressed into a cake, the rotating retaining ring 301 drives the crushing tip 307 to crush the filter cake. The crushing blade 306 facilitates further crushing of the filter cake, making it easy to put it into the reaction solvent for further reaction and extraction. This process is repeated multiple times to achieve efficient extraction of hydroquinone.

[0042] After the reaction of hydroquinone with the solvent, solid-liquid separation is required. A pipette combined with a pump structure facilitates the extraction of the reacted liquid for subsequent heating and purification. The electric cylinder 401 slides into the sliding opening 406 and is hooked and fixed to the connecting cover 405 via a limiting pressure plate 403, facilitating the fixation of the extraction screen 409. The limiting pressure plate 403 is raised and lowered on the limiting plate 408 via a limiting slot 404. The cross-shaped locking block 402 engages with the cross-shaped locking hole 407 to limit the connection between the piston rod and the connecting cover 405. When the extraction screen 409 descends to compress the extracted solid, the electric cylinder 401 drives the limiting pressure plate 403 to contact the extraction screen 409. The limiting plate 408 facilitates the fixation of the limiting pressure plate 409. The lifting and lowering of 03 is limited, with the cross-shaped locking block 402 engaging with the cross-shaped locking hole 407. The extraction pressure screen 409 moves up and down on the inner wall of the extraction reactor 1 for further limiting and preventing the extraction pressure screen 409 from falling out. The separation filter screen 410 of the extraction pressure screen 409 facilitates further filtration of solid particles in the filtered liquid, thus improving the purity of the extraction. The separation filter screen 410 is fixed to the transmission shaft 302 and the piston rod of the electric cylinder 401. The extraction pressure screen 409 slides and engages with the electric cylinder 401, and engages with the separation filter screen 410 from top to bottom, making it easy to remove the extraction pressure screen 409 for cleaning. The rotating retaining ring 301 is located at the bottom of the extraction reactor 1, which facilitates stirring and mixing without affecting the filtration of the extraction pressure screen 409, making it convenient and quick to use.

[0043] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A high-efficiency extraction device for producing hydroquinone via phenol hydroxylation, characterized in that: include: Extraction reactor (1) is used for efficient extraction in the preparation of hydroquinone; The opening and closing mechanism (2) is located above the extraction reactor (1); The high-efficiency extraction mechanism (3) is located inside the extraction reactor (1). The high-efficiency extraction mechanism (3) includes a rotating retaining ring (301). The inner wall of the rotating retaining ring (301) is uniformly provided with stirring support rods (304). The bottom of the stirring support rods (304) is provided with a linearly distributed connecting shaft (305). The outer periphery of the connecting shaft (305) is uniformly provided with staggered breaking blades (306). The bottom of the rotating retaining ring (301) is provided with annularly distributed breaking tip bolts (307). The solid-liquid separation mechanism (4) is located above the high-efficiency extraction mechanism (3). The solid-liquid separation mechanism (4) includes an electric cylinder (401). A limiting pressure plate (403) is provided at the bottom end of the piston rod of the electric cylinder (401). An extraction pressure screen (409) is provided below the limiting pressure plate (403). A separation filter screen (410) is snapped onto the top of the extraction pressure screen (409). The piston rod of the electric cylinder (401) is provided with a cross-shaped locking block (402) on its outer periphery. The limiting pressure plate (403) is symmetrically provided with limiting slots (404). The bottom of the cross-shaped locking block (402) is provided with a connecting cover (405). The connecting cover (405) is symmetrically provided at the bottom of the inner wall of the extraction pressure screen (409). The bottom of the connecting cover (405) is provided with a sliding opening (406) that is adapted to the limiting pressure plate (403). The limiting pressure plate (403) is slidably engaged with the connecting cover (405) by providing the sliding opening (406). The top of the connecting cover (405) is provided with a cross-shaped locking hole (407) that is compatible with the cross-shaped locking block (402), and the cross-shaped locking hole (407) is connected to the sliding opening (406). The cross-shaped locking block (402) is fixed to the connecting cover (405) by setting the cross-shaped locking hole (407). The inner wall of the connecting cover (405) is provided with a limiting plate (408) that is adapted to the limiting slot (404), and the limiting pressure plate (403) is slidably engaged with the limiting plate (408) by providing the limiting slot (404); The top of the stirring support rod (304) is provided with a drive shaft (302), the top end of the drive shaft (302) is connected and fixed to the drive end of the AC motor (303), and the AC motor (303) is provided on the top of the connecting cover plate (206).

2. The high-efficiency extraction device for producing hydroquinone by phenol hydroxylation according to claim 1, characterized in that: The opening and closing mechanism (2) includes a limiting ring (201), and an opening and closing cover plate (202) adapted to the top opening of the extraction reactor (1) is slidably arranged between the limiting rings (201). Magnetic sliders (203) adapted to the limiting rings (201) are symmetrically arranged on both sides of the opening and closing cover plate (202). An auxiliary handle (204) is provided on one side of the opening and closing cover plate (202).

3. The high-efficiency extraction device for producing hydroquinone by phenol hydroxylation according to claim 2, characterized in that: The top of the limiting ring (201) is symmetrically provided with a fixing groove (205), and the inner wall of the fixing groove (205) is engaged with the connecting cover plate (206). The connecting cover plate (206) is symmetrically provided with limiting support plates (207) on both sides, and the opening and closing cover plate (202) is symmetrically provided on the outer walls of the other two sides of the connecting cover plate (206).

4. The high-efficiency extraction device for producing hydroquinone by phenol hydroxylation according to claim 1, characterized in that: The extraction reactor (1) has fixed base plates (208) symmetrically arranged on both sides of its outer wall, which are adapted to the limiting support plate (207). A lifting cylinder (209) is arranged between the fixed base plate (208) and the limiting support plate (207).

5. The high-efficiency extraction apparatus for producing hydroquinone by phenol hydroxylation according to claim 1, characterized in that: The electric cylinder (401) is symmetrically arranged on the connecting cover plate (206), and the inner wall of the extraction pressure screen (409) and the separation filter screen (410) is rotatably provided with a drive shaft (302).

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