Low-temperature extraction system for industrial production of water-soluble benzophenone ultraviolet light absorber

Abstract

The invention relates to the technical field of ultraviolet light absorber production, in particular to a low-temperature extraction system for industrial production of a water-soluble benzophenone ultraviolet light absorber, which comprises a mixture storage tank, a transfer pump, a conveying pipe, a sealing box, a liquid separation hopper, a telescopic sleeve, an oscillation assembly, a distillation recovery assembly and a quantitative weighing assembly, one side of the mixture storage tank is connected with the input end of the transfer pump, the conveying pipe is installed on the outer side of the output end of the transfer pump and extends into the inner side of the top of the sealing box, the quantitative weighing assembly is installed at the lower end of a discharging port of the conveying pipe, the telescopic sleeve is installed at the lower end of the quantitative weighing assembly, and the liquid separation hopper is connected to the inner side of the telescopic sleeve in a sleeved mode. The oscillation assembly is clamped to the outer side of the liquid separation hopper, and the distillation recovery assembly is installed at the lower end of the telescopic sleeve. The system can mechanically and automatically oscillate and effectively prevent workers from inhaling diethyl ether, the additionally arranged diethyl ether distillation and recovery structure can enable clean diethyl ether to flow back into the liquid separation hopper again, and the purpose of separating and recycling diethyl ether is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of ultraviolet absorber production, and in particular to a low-temperature extraction system for industrial production of water-soluble benzophenone ultraviolet absorbers. Background Art

[0002] Benzophenone compounds are widely used in medicine, pesticides, dyes, plastics, coatings, daily chemicals, electronic chemicals and other fields due to their simple synthesis, low cost and excellent performance. Among all fields, benzophenone ultraviolet absorbers are widely used. Due to the increasingly serious destruction of the earth's ozone layer, ultraviolet radiation to the earth is becoming more and more intense, and ultraviolet absorbers have become one of the indispensable functional additives for various polymer materials, skin care products, etc. Benzophenone ultraviolet absorbers can strongly absorb ultraviolet rays in the wavelength range of 270-330nm and are used in various plastics such as polyethylene, polypropylene, polystyrene, ABS resin, polycarbonate, polyvinyl chloride, polyester and epoxy resin. Water-based benzophenone ultraviolet absorbers have the advantages of being colorless, odorless, highly efficient and having excellent water solubility in a wide pH range, and have received extensive research attention. At present, water solubility is mainly enhanced by introducing hydrophilic groups such as quaternary ammonium salts and sulfonic acid groups on the benzophenone parent nucleus, and the introduction of sulfonic acid groups on the parent nucleus is achieved by sulfonation reaction.

[0003] After searching, the Chinese patent application number: 202310003495.2 discloses a method for preparing a water-soluble benzophenone ultraviolet absorber, the steps comprising:

[0004] 1) 2,4-dihydroxybenzophenone, a solid base catalyst, a water-absorbing resin and a solvent A are mixed and stirred to obtain a solution, and then a mixed solution of 1,3-propane sultone and a solvent B is added thereto under stirring to perform a reflux reaction;

[0005] 2) filtering the reaction system of step 1), removing the solvent under reduced pressure, then adding water to dissolve, extracting with a non-polar solvent at low temperature, and dehydrating the aqueous phase under reduced pressure to obtain a water-soluble ultraviolet absorber, wherein the non-polar solvent is selected from at least one of cyclohexane, n-hexane, methylcyclohexane, dimethylcyclohexane, and diethyl ether, preferably diethyl ether.

[0006] With respect to the above-mentioned related technologies, the inventor believes that there are the following technical defects that need to be improved:

[0007] In the process of using conventional equipment and ether to extract water-soluble ultraviolet absorbers, since the process of ether extraction of the target object mainly relies on the solubility difference of the substance in the solvent and physical separation technology, the target compound is transferred from one solvent to another solvent through repeated manual oscillation, standing, separation and other operations. The manual oscillation amplitude is small and the number and frequency of oscillations are uncontrollable. It is difficult for the target object to dissolve quickly in the solvent, and there is no relevant structure for recovering ether, which is not conducive to the separation and recycling of ether. Summary of the invention

[0008] The present application provides a low-temperature extraction system for industrial production of water-soluble benzophenone ultraviolet absorbers to improve the following technical problems:

[0009] In the process of using conventional equipment and ether to extract water-soluble ultraviolet absorbers, since the process of ether extraction of the target object mainly relies on the solubility difference of the substance in the solvent and physical separation technology, the target compound is transferred from one solvent to another solvent through repeated oscillation, standing, separation and other operations. The artificial oscillation amplitude is small and the number and frequency of oscillations are uncontrollable. It is difficult for the target object to dissolve quickly in the solvent, and there is no relevant structure for recovering ether, which is not conducive to the separation and recycling of ether.

[0010] The present application provides a low-temperature extraction system for industrial production of water-soluble benzophenone ultraviolet absorbers, which adopts the following technical solution:

[0011] A low-temperature extraction system for industrial production of water-soluble benzophenone ultraviolet absorbers, comprising a mixture storage tank, a feed pump, a feed pipe, a sealing box, a liquid separator, a telescopic sleeve, an oscillation component, a distillation recovery component and a quantitative weighing component, wherein one side of the mixture storage tank is fixedly connected to the input end of the feed pump through a pipeline, the feed pipe is installed on the outside of the output end of the feed pump and extends into the top inner side of the sealing box, the quantitative weighing component is installed at the lower end of the discharge port of the feed pipe, the telescopic sleeve is installed at the lower end of the quantitative weighing component, the liquid separator is sleeved on the inner side of the telescopic sleeve, the oscillation component is clamped on the outer side of the liquid separator, and the distillation recovery component is installed at the lower end of the telescopic sleeve;

[0012] The mixture storage tank is used to store the extraction target mixture, the extraction pump cooperates with the feed pipe to negatively pump the internal mixture of the mixture storage tank into the interior of the quantitative weighing component, the quantitative weighing component is used for quantitative weighing of the mixture and the ether solution, the sealing box is used to provide a sealed environment for ether extraction, the oscillation component is used to shake the separatory bucket, the separatory bucket is used for the natural stratification of ether and the mixture according to the density difference, the telescopic sleeve is used to flexibly connect the separatory bucket and prevent the separatory bucket from being separated from the telescopic sleeve when swinging, and the distillation recovery component is used to collect the ether organic phase and evaporate and recycle the ether in the organic phase.

[0013] In an achievable technical solution of the present application, the oscillation assembly includes a fixed plate, a stepper motor, a connecting shaft, a cam, a swing frame and a tension spring, the fixed plate is installed inside the sealed box, the stepper motor is installed on the outside of the sealed box, the connecting shaft passes through one side of the sealed box and is fixedly connected to the motor shaft of the stepper motor through a coupling, the cam is installed on the outside of the connecting shaft, one side of the swing frame abuts against the surface of the cam, and the tension spring is installed on the top side of the swing frame.

[0014] In an achievable technical solution of the present application, the distillation recovery component includes a heating base, a heating container, a straight-connected pipe and a serpentine condenser. The heating base is fixedly connected to the inside of the sealed box, the heating container is installed on the inner side of the heating base, one end of the serpentine condenser passes through the inner side of the top of the heating container and fits tightly with the inner surface of the heating container, and the straight-connected pipe is installed on the upper end of the serpentine condenser and fixedly connected to one side of the top of the feed pipe.

[0015] In an achievable technical solution of the present application, the quantitative weighing assembly includes a support plate, a feed hopper, a weighing sensor and a support block, the bottom of the feed hopper is fixedly connected to the surface of the support block, the weighing sensor is installed at the lower end of the support block and fixedly connected to the surface of the support plate, and one side of the support plate is fixedly connected to the inner surface of the sealing box.

[0016] In an achievable technical solution of the present application, a clamping arm body is also installed on the inner side of the swing frame, and the vise end of the clamping arm body is tightly fitted with the outer wall surface of the liquid separation bucket.

[0017] In an achievable technical solution of the present application, a rotating shaft is also installed in the middle of the swing frame, and the rotating shaft is rotatably connected to the inner side of the sealing box.

[0018] In an achievable technical solution of the present application, a small liquid pump is further provided at the bottom of the straight-connected pipe, and the small liquid pump is used to return the condensed ether solution inside the serpentine condenser to the liquid separator.

[0019] In an achievable technical solution of the present application, an ether storage tank, an injection tube and a small liquid pump are also provided inside the sealed box. One end of the injection tube passes through the interior of the ether storage tank and fits tightly with the surface of the ether storage tank, and the other side of the injection tube is fixedly connected to the surface of the direct-connection tube. The small liquid pump is installed on one side of the injection tube.

[0020] In an achievable technical solution of the present application, one-way valves are installed on the outer sides of the injection pipe and the direct connection pipe.

[0021] In a feasible technical solution of the present application, an electric heating plate is also installed on the inner side of the heating base, and the electric heating plate is used to heat the heating container.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] This system is a fully automatic extraction method. It mechanically shakes the liquid separator to ensure that the mixture is fully mixed and layered. The extraction process is carried out in a sealed box to prevent air from entering the box and prevent workers from inhaling ether, thereby increasing safety performance.

[0024] In addition, this system adds an ether distillation and recovery structure after extraction. By pouring appropriate amounts of potassium permanganate and distilled water into the ether storage tank, the oxides inside the solution are removed. The electric heating plate evaporates the clean ether, which is then liquefied through the serpentine condenser and refluxed into the separatory bucket, thereby achieving the purpose of separating, recycling and utilizing the ether. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a schematic structural diagram of a low-temperature extraction system for industrial production of water-soluble benzophenone ultraviolet absorbers according to an embodiment of the present application.

[0027] Figure 2 It is a schematic diagram of the structure of the oscillation component in the embodiment of the present application.

[0028] Figure 3 yes Figure 2 A magnified schematic diagram of center A.

[0029] Figure 4 It is a schematic diagram of the structure of the quantitative weighing component in the embodiment of the present application.

[0030] Figure 5 It is a schematic diagram of the structure of the back of the sealed box in the embodiment of the present application.

[0031] Figure 6 It is a distribution diagram of the electric heating plate in the embodiment of the present application.

[0032] Description of reference numerals:

[0033] 1. Mixture storage tank; 2. Extraction pump; 3. Feed pipe; 4. Sealing box; 5. Liquid separator; 6. Telescopic sleeve;

[0034] 7. Oscillation assembly; 71. Fixed plate; 72. Stepping motor; 73. Connecting shaft; 74. Cam; 75. Swinging frame; 76. Tension spring;

[0035] 8. Distillation recovery assembly; 81. Heating base; 82. Heating container; 83. Direct connection pipe; 84. Serpentine condenser;

[0036] 9. Quantitative weighing assembly; 91. Support plate; 92. Feed hopper; 93. Weighing sensor; 94. Support block;

[0037] 10. Clamping arm body; 11. Rotating shaft; 12. Small liquid pump 1; 13. Ether storage tank; 14. Liquid injection pipe; 15. Small liquid pump 2; 16. One-way valve; 17. Electric heating plate. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0039] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0040] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] The following is combined with Figure 1-6 This application is described in further detail.

[0043] The present application discloses a low-temperature extraction system for industrial production of water-soluble benzophenone ultraviolet absorbers. Figure 1-Figure 6 The low-temperature extraction system for industrial production of water-soluble benzophenone ultraviolet absorbers includes a mixture storage tank 1, a feed pump 2, a feed pipe 3, a sealing box 4, a liquid separator 5, a telescopic sleeve 6, an oscillation component 7, a distillation recovery component 8 and a quantitative weighing component 9. One side of the mixture storage tank 1 is fixedly connected to the input end of the feed pump 2 through a pipeline, the feed pipe 3 is installed on the outer side of the output end of the feed pump 2 and extends into the inner side of the top of the sealing box 4, the quantitative weighing component 9 is installed at the lower end of the discharge port of the feed pipe 3, the telescopic sleeve 6 is installed at the lower end of the quantitative weighing component 9, the liquid separator 5 is sleeved on the inner side of the telescopic sleeve 6, the oscillation component 7 is clamped on the outer side of the liquid separator 5, and the distillation recovery component 8 is installed at the lower end of the telescopic sleeve 6;

[0044] The mixture storage tank 1 is used to store the extraction target mixture, the extraction pump 2 cooperates with the feed pipe 3 to negatively pump the internal mixture of the mixture storage tank 1 into the interior of the quantitative weighing component 9, the quantitative weighing component 9 is used for quantitative weighing of the mixture and the ether solution, the sealing box 4 is used to provide a sealed environment for ether extraction, the oscillation component 7 is used to shake the separator hopper 5, the separator hopper 5 is used for the natural stratification of ether and the mixture according to the density difference, the telescopic sleeve 6 is used to flexibly connect the separator hopper 5 and prevent the separator hopper 5 from being separated from the telescopic sleeve 6 when swinging, and the distillation recovery component 8 is used to collect the ether organic phase and evaporate and recycle the ether in the organic phase.

[0045] The oscillation assembly 7 includes a fixed plate 71, a stepper motor 72, a connecting shaft 73, a cam 74, a swing frame 75 and a tension spring 76. The fixed plate 71 is installed inside the sealing box 4, the stepper motor 72 is installed on the outside of the sealing box 4, the connecting shaft 73 passes through one side of the sealing box 4 and is fixedly connected to the motor shaft of the stepper motor 72 through a coupling, the cam 74 is installed on the outside of the connecting shaft 73, one side of the swing frame 75 is in contact with the surface of the cam 74, and the tension spring 76 is installed on the top side of the swing frame 75.

[0046] The distillation recovery component 8 includes a heating base 81, a heating container 82, a straight-connecting pipe 83 and a serpentine condenser 84. The heating base 81 is fixedly connected to the inside of the sealed box 4, the heating container 82 is installed on the inner side of the heating base 81, one end of the serpentine condenser 84 passes through the inner side of the top of the heating container 82 and fits tightly with the inner surface of the heating container 82, and the straight-connecting pipe 83 is installed at the upper end of the serpentine condenser 84 and fixedly connected to one side of the top of the feed pipe 3.

[0047] The quantitative weighing assembly 9 includes a support plate 91, a feed hopper 92, a weighing sensor 93 and a support block 94. The bottom of the feed hopper 92 is fixedly connected to the surface of the support block 94. The weighing sensor 93 is installed at the lower end of the support block 94 and fixedly connected to the surface of the support plate 91. One side of the support plate 91 is fixedly connected to the inner surface of the sealing box 4.

[0048] A clamping arm body 10 is also installed on the inner side of the swing frame 75 , and the vise end of the clamping arm body 10 is tightly fitted with the outer wall surface of the liquid separation bucket 5 .

[0049] A rotating shaft 11 is also installed in the middle of the swing frame 75 , and the rotating shaft 11 is rotatably connected to the inner side of the sealing box 4 .

[0050] A small liquid pump 12 is also provided at the bottom of the direct-connection pipe 83 , and the small liquid pump 12 is used to return the condensed ether solution inside the serpentine condenser 84 to the liquid separator 5 .

[0051] The interior of the sealed box 4 is also provided with an ether storage tank 13, an injection pipe 14 and a small liquid extraction pump 15. One end of the injection pipe 14 passes through the interior of the ether storage tank 13 and fits tightly with the surface of the ether storage tank 13, and the other side of the injection pipe 14 is fixedly connected to the surface of the direct-connection pipe 83. The small liquid extraction pump 15 is installed on one side of the injection pipe 14.

[0052] One-way valves 16 are installed on the outsides of the liquid injection pipe 14 and the direct connection pipe 83 .

[0053] An electric heating plate 17 is also installed on the inner side of the heating base 81 , and the electric heating plate 17 is used to heat the heating container 82 .

[0054] The use process of the low-temperature extraction system for industrial production of water-soluble benzophenone ultraviolet absorbers in the embodiment of the present application is roughly as follows:

[0055] 1. After the target mixture is put into the mixture storage tank 1, the pump 2 is started to transport the mixture from the feed pipe 3 to the inside of the feed hopper 92. The weighing sensor 93 located on the support plate 91 can weigh the mixture in real time to ensure the accurate input amount;

[0056] 2. After weighing, open the discharge valve of the feed hopper 92, and the mixture inside falls from the telescopic sleeve 6 into the liquid separator 5. Then, open the small liquid pump 15 above the ether storage tank 13 to pass the ether solution into the feed hopper 92 and weigh it, and then put it into the liquid separator 5;

[0057] 3. Start the clamping arm bodies 10 on both sides of the swing frame 75 to firmly clamp the liquid inlet and outlet surfaces of the liquid separator 5, then electrically start the stepping motor 72 outside the sealing box 4, and drive the cam 74 to rotate through the connecting shaft 73. The irregular protruding surface of the cam 74 fits the bottom surface of the swing frame 75 during rotation, and cooperates with the repeatedly stretched tension spring 76, so that the swing frame 75 and the rotating shaft 11 drive the liquid separator 5 to oscillate repeatedly along the inside of the sealing box 4, so as to fully mix the target object and ether;

[0058] 4. Then, the separatory funnel 5 is left to stand for a while to allow the ether and the mixture to separate naturally according to the density difference;

[0059] 5. Since the density of ether is smaller than that of water, the ether layer is usually located in the upper layer. Then, the discharge valve of the separator 5 is opened, and the water phase of the lower layer is first discharged into the ether storage tank 13 and then discharged outside. Then, the ether layer is slowly discharged and transferred to the ether storage tank 13. Then, the organic phase solution is washed with 0.5% potassium permanganate solution until the organic phase solution no longer fades to purple, so as to remove the oxide therein;

[0060] 6. Wash the organic phase solution with distilled water to remove impurities such as potassium permanganate;

[0061] 7. Then, the electric heating plate 17 in the heating base 81 is electrically started to fully heat the heating container 82, and the small liquid extraction pump 12 is started at the same time. The electric heating plate 17 evaporates the clean ether, which is then liquefied through the serpentine condenser 84 and flows back to the liquid separator 5, thereby achieving the purpose of separating, recycling and utilizing the ether.

[0062] The beneficial technical effects of the low-temperature extraction system for industrial production of water-soluble benzophenone ultraviolet absorbers according to the embodiment of the present application are as follows:

[0063] This system is a fully automatic extraction method, mechanically and stably shaking the liquid separator 5 to ensure that the mixture is fully mixed and layered, and the extraction process is carried out in a sealed box 4 to isolate air from entering the box to prevent workers from inhaling ether, thereby increasing safety performance;

[0064] In addition, the system adds an ether distillation recovery structure after extraction, by pouring appropriate amounts of potassium permanganate and distilled water into the ether storage tank 13 to remove the internal oxides of the solution, the electric heating plate 17 evaporates the clean ether, and then liquefies it through the serpentine condenser 84 and flows back to the separator 5, thereby achieving the purpose of separating, recycling and utilizing the ether.

[0065] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the application should be included in the scope of protection of the present application.

Claims

1. A low-temperature extraction system for industrial production of water-soluble benzophenone ultraviolet absorbers, characterized in that: The invention comprises a mixture storage tank (1), a feed pump (2), a feed pipe (3), a sealing box (4), a liquid separator (5), a telescopic sleeve (6), an oscillating assembly (7), a distillation recovery assembly (8) and a quantitative weighing assembly (9), wherein one side of the mixture storage tank (1) is fixedly connected to the input end of the feed pump (2) through a pipeline, the feed pipe (3) is installed on the outer side of the output end of the feed pump (2) and extends into the inner side of the top of the sealing box (4), the quantitative weighing assembly (9) is installed at the lower end of the discharge port of the feed pipe (3), the telescopic sleeve (6) is installed at the lower end of the quantitative weighing assembly (9), the liquid separator (5) is sleeved on the inner side of the telescopic sleeve (6), the oscillating assembly (7) is clamped on the outer side of the liquid separator (5), and the distillation recovery assembly (8) is installed at the lower end of the telescopic sleeve (6); The mixture storage tank (1) is used to store the extraction target mixture, the extraction pump (2) cooperates with the feed pipe (3) to negatively pressure the internal mixture of the mixture storage tank (1) into the interior of the quantitative weighing component (9), the quantitative weighing component (9) is used for quantitative weighing of the mixture and the ether solution, the sealing box (4) is used to provide a sealed environment for ether extraction, the oscillation component (7) is used to shake the liquid separation bucket (5), the liquid separation bucket (5) is used to naturally separate the ether and the mixture according to the density difference, the telescopic sleeve (6) is used to flexibly connect the liquid separation bucket (5) and prevent the liquid separation bucket (5) from being separated from the telescopic sleeve (6) when swinging, and the distillation recovery component (8) is used to collect the ether organic phase and evaporate and recycle the ether in the organic phase.

2. The low-temperature extraction system for industrial production of water-soluble benzophenone ultraviolet absorbers according to claim 1, characterized in that: The oscillation assembly (7) comprises a fixed plate (71), a stepper motor (72), a connecting shaft (73), a cam (74), a swing frame (75) and a tension spring (76); the fixed plate (71) is mounted inside the sealing box (4); the stepper motor (72) is mounted on the outside of the sealing box (4); the connecting shaft (73) passes through one side of the sealing box (4) and is fixedly connected to the motor shaft of the stepper motor (72) via a coupling; the cam (74) is mounted on the outside of the connecting shaft (73); one side of the swing frame (75) abuts against the surface of the cam (74); and the tension spring (76) is mounted on one side of the top of the swing frame (75).

3. The low-temperature extraction system for industrial production of water-soluble benzophenone ultraviolet absorbers according to claim 1, characterized in that: The distillation recovery component (8) includes a heating base (81), a heating container (82), a straight-connected pipe (83) and a serpentine condenser (84); the heating base (81) is fixedly connected to the inside of the sealed box (4); the heating container (82) is installed on the inner side of the heating base (81); one end of the serpentine condenser (84) passes through the inner side of the top of the heating container (82) and fits tightly with the inner surface of the heating container (82); the straight-connected pipe (83) is installed on the upper end of the serpentine condenser (84) and is fixedly connected to one side of the top of the feed pipe (3).

4. The low-temperature extraction system for industrial production of water-soluble benzophenone ultraviolet absorbers according to claim 1, characterized in that: The quantitative weighing assembly (9) comprises a support plate (91), a feed hopper (92), a weighing sensor (93) and a support block (94); the bottom of the feed hopper (92) is fixedly connected to the surface of the support block (94); the weighing sensor (93) is mounted on the lower end of the support block (94) and is fixedly connected to the surface of the support plate (91); and one side of the support plate (91) is fixedly connected to the inner surface of the sealing box (4).

5. The low-temperature extraction system for industrial production of water-soluble benzophenone ultraviolet absorbers according to claim 2, characterized in that: A clamping arm body (10) is also installed on the inner side of the swing frame (75), and the vise end of the clamping arm body (10) is tightly fitted with the outer wall surface of the liquid separation bucket (5).

6. The low-temperature extraction system for industrial production of water-soluble benzophenone ultraviolet absorbers according to claim 5, characterized in that: A rotating shaft (11) is also installed in the middle of the swing frame (75), and the rotating shaft (11) is rotatably connected to the inner side of the sealing box (4).

7. The low-temperature extraction system for industrial production of water-soluble benzophenone ultraviolet absorbers according to claim 3, characterized in that: A small liquid pump (12) is also provided at the bottom of the direct-connection pipe (83), and the small liquid pump (12) is used to return the condensed ether solution inside the serpentine condenser (84) to the liquid separator (5).

8. The low-temperature extraction system for industrial production of water-soluble benzophenone ultraviolet absorbers according to claim 7, characterized in that: The sealed box (4) is also provided with an ether storage tank (13), a liquid injection pipe (14) and a second small liquid extraction pump (15). One end of the liquid injection pipe (14) passes through the interior of the ether storage tank (13) and is tightly fitted with the surface of the ether storage tank (13), and the other side of the liquid injection pipe (14) is fixedly connected to the surface of the direct-connection pipe (83). The second small liquid extraction pump (15) is installed on one side of the liquid injection pipe (14).

9. The low-temperature extraction system for industrial production of water-soluble benzophenone ultraviolet absorbers according to claim 8, characterized in that: One-way valves (16) are installed on the outsides of the liquid injection pipe (14) and the direct connection pipe (83).

10. The low-temperature extraction system for industrial production of water-soluble benzophenone ultraviolet absorbers according to claim 3, characterized in that: An electric heating plate (17) is also installed on the inner side of the heating base (81), and the electric heating plate (17) is used to heat the heating container (82).

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