A photocatalytic reactor for the production of 2,5-dimethoxydihydrofuran

Abstract

The present application is a kind of 2,5-dimethoxydihydrofuran production photocatalytic reactor, it relates to the technical field of reactor, it includes tank body, catalyst bed, illumination device and circulation assembly, catalyst bed includes two supporting nets, two supporting nets are arranged on the inner wall of tank body, and some ceramic balls are filled between two supporting nets, and each ceramic ball is adhered with photocatalyst;Illumination device includes rotating shaft, and rotating shaft is rotatably arranged on the upper end of tank body, is coaxially fixedly connected with rotating motor, and the other end of rotating shaft extends between two supporting nets, is provided with multiple stirring rollers on the outer wall of rotating shaft between two supporting nets, and each stirring roller is lamp tube;Circulation assembly is used for exporting some ceramic balls in catalyst bed, and then re-importing in catalyst bed.The present application has the mixed liquor reaction that can make the generation of 2,5-dimethoxydihydrofuran as far as possible thorough, thereby improving the effect of 2,5-dimethoxydihydrofuran production quality.

Description

Technical Field

[0001] The present application relates to the technical field of reactors, and in particular to a photocatalytic reactor for producing 2,5-dimethoxydihydrofuran. Background Art

[0002] 2,5-Dimethoxydihydrofuran is an organic compound, a derivative of dihydrofuran, which may be used in the synthesis of drugs, fragrances or other fine chemicals.

[0003] A fixed-bed continuous-flow photocatalytic reactor is essential equipment for producing 2,5-dimethoxydihydrofuran. In the prior art, a photocatalyst is fixed on a specific carrier (e.g., ceramic balls) to form a catalyst bed. The catalyst bed is then illuminated by a lighting device, and a mixed liquid that produces 2,5-dimethoxydihydrofuran flows through the catalyst bed. Under the illumination of the lighting device, the photocatalyst on the specific carrier in the catalyst bed is able to receive the light source and begin a catalytic reaction on the mixed liquid flowing into the catalyst bed, thereby producing 2,5-dimethoxydihydrofuran.

[0004] However, when the illumination device irradiates the specific carriers in the catalyst bed, the light emitted by the illumination device is difficult to irradiate the photocatalysts on all the specific carriers. Therefore, it is difficult for the photocatalysts on all the specific carriers to fully exert their catalytic effects, resulting in an incomplete reaction of the mixed liquid and the production of incomplete reactants, thereby reducing the production quality of 2,5-dimethoxydihydrofuran. Summary of the Invention

[0005] The purpose of the present application is to provide a photocatalytic reactor for the production of 2,5-dimethoxydihydrofuran, which can make the mixed liquid reaction of generating 2,5-dimethoxydihydrofuran as thorough as possible, thereby improving the production quality of 2,5-dimethoxydihydrofuran.

[0006] The photocatalytic reactor for producing 2,5-dimethoxydihydrofuran provided in this application adopts the following technical solution:

[0007] A tank body, wherein a feed port is provided on the upper portion of the tank body and a discharge port is provided on the lower portion of the tank body;

[0008] The catalyst bed comprises two support nets arranged vertically and mounted on the inner wall of the tank, with a plurality of ceramic balls filled between the two support nets, each of the ceramic balls being adhered with a photocatalyst;

[0009] The lighting device includes a rotating shaft, which is coaxially rotatably mounted on the upper end of the tank body. One end of the rotating shaft extends to the outside of the tank body and is coaxially fixedly connected to a rotating motor. The other end of the rotating shaft extends between two support nets. A plurality of stirring rollers are provided on the outer wall of the rotating shaft between the two support nets, each stirring roller being a lamp tube.

[0010] The circulation component is used to guide a number of ceramic balls out of the catalyst bed and then reintroduce them into the catalyst bed. During the process of the circulation component guiding the ceramic balls out of the catalyst bed and reintroducing them, the illumination device can also illuminate the guided ceramic balls.

[0011] Optionally, the stirring roller is configured to be in a "bow" shape, and multiple stirring rollers are evenly spaced around the axis of the rotating shaft. Each stirring roller is sequentially sleeved with a larger "bow"-shaped stirring roller in the direction away from the rotating shaft, and each stirring roller sequentially sleeved in the direction away from the rotating shaft is also evenly spaced.

[0012] Optionally, a plurality of transparent bumps are provided on the surface of each ceramic ball, each transparent bump is made of elastic material, and the transparent bumps can refract and reflect light.

[0013] Optionally, the circulation component includes a ball guide tube, which is arranged to pass through the entire catalyst bed in a vertical direction, the upper end of the ball guide tube is bent and inserted into the catalyst bed from the upper end of the catalyst bed, and the lower end of the ball guide tube is also bent and inserted into the catalyst bed from the lower end of the catalyst bed. A top hole is provided at the bend of the lower end of the ball guide tube, and a top rod is slidably provided on the lower end support net, one end of the top rod is slidably inserted into the top hole, and a first driving member for driving the top rod to slide back and forth is provided on the lower end support net, the inner diameter of the ball guide tube is the same as the diameter of the ceramic ball, the aperture of the top hole is the same as the inner diameter of the ball guide tube, and the diameter of the top rod is the same as the aperture of the top hole.

[0014] Optionally, a diversion component is further provided on the inner wall of the tank body, and the diversion component includes a diversion screen. The diversion screen is coaxially located above the catalyst bed, and the peripheral wall of the diversion screen abuts the inner wall of the tank body. A through hole is opened at the center of the diversion screen for the rotating shaft to pass through, and the hole wall of the through hole abuts the peripheral wall of the rotating shaft. The diversion screen is arrayed with sieve holes for the mixed liquid to flow through.

[0015] Optionally, a slide groove is provided on the inner wall of the tank body in the vertical direction, the diverter screen is located in the slide groove, and the peripheral wall of the diverter screen slides and abuts against the groove wall of the slide groove, the hole wall of the through hole slides and abuts against the peripheral wall of the rotating shaft, and the rotating shaft is also provided with a second driving member for driving the diverter screen to slide back and forth up and down.

[0016] Optionally, the second driving member includes a toggle rod and a toggle block, the toggle rod is fixedly mounted on the outer peripheral wall of the rotating shaft in the vertical direction, the toggle block is coaxially fixedly mounted on the lower end face of the diversion screen, and is coaxially slidably sleeved on the rotating shaft, the lower end face of the toggle block is provided with a wave groove, and a roller is provided at the highest point of the toggle rod, and the roller slides and rotates in abutment with the groove wall of the wave groove.

[0017] In summary, this application includes at least one of the following beneficial technical effects:

[0018] 1. Through the setting of the stirring roller, the stirring roller can stir between the several ceramic balls in the catalyst bed, so that the stirring roller can contact each ceramic ball in the catalyst bed as much as possible. Since all the stirring rollers in the present application are set as lamp tubes, the lamp tubes can contact each ceramic ball in the catalyst bed as much as possible, so that the light emitted by the lamp tubes can be irradiated on the surface of each ceramic ball in the catalyst bed as much as possible, and then the photocatalyst on the surface of each ceramic ball can receive the light. The position of each ceramic ball in the catalyst bed can be disrupted and reorganized through the circulation component, thereby further ensuring Each ceramic ball can contact the stirring roller, which further ensures that the light emitted by the lamp tube can irradiate the surface of each ceramic ball in the catalyst bed as much as possible. Therefore, when the mixed liquid passes through the support mesh and enters the gaps between the ceramic balls, the photocatalyst can start to react and catalyze the mixed liquid. During this process, the ceramic balls are in a state of being stirred by the lamp tube, and each photocatalyst on the surface of the ceramic balls can receive light as much as possible, thereby maximizing the role of the photocatalyst and making the reaction of the mixed liquid to produce 2,5-dimethoxydihydrofuran as thorough as possible, thereby improving the production quality of 2,5-dimethoxydihydrofuran.

[0019] 2. In the present application, each ceramic ball is provided with a transparent protrusion on its surface. First, the transparent protrusion can increase the friction between the stirring roller and the ceramic ball. Therefore, when the stirring roller stirs between several ceramic balls, the stirring roller can drive the ceramic balls in contact with it to rotate, so that other parts of the surface of the ceramic ball can contact the stirring roller, and thus the photocatalyst on the surface of the ceramic ball that is in contact with the stirring roller again can be more fully irradiated with light. Therefore, during the stirring process of the stirring roller, the stirring roller can drive multiple ceramic balls to rotate, and the transparent protrusion can also increase the friction between the ceramic balls. Therefore, while the stirring roller is stirring, it can drive most or even all of the ceramic balls to rotate, so that the photocatalyst on the surface of the ceramic ball can receive light irradiation as much as possible, thereby greatly improving the overall utilization rate of the catalyst on the surface of all ceramic balls, thereby making the reaction of the mixed liquid to produce 2,5-dimethoxydihydrofuran as thorough as possible and improving the production quality of 2,5-dimethoxydihydrofuran;

[0020] 3. The transparent bumps in the present application can reflect and refract light to a certain extent, thereby reflecting or refracting the light emitted from the stirring roller to the surface of the adjacent ceramic balls, thereby further improving the utilization of the photocatalyst. In addition, the provision of the transparent bumps can reduce the space between the ceramic balls, thereby reducing the probability of the light emitted from the stirring roller passing through the catalyst bed. That is, the light emitted from the stirring roller can be fully absorbed and utilized, greatly improving the utilization rate of light energy of the device, not only further improving the reaction effect of the photocatalyst, but also reducing light energy loss.

[0021] 4. The transparent bumps can reduce the space between the ceramic balls. These gaps are also the channels for the mixed liquid to flow through the catalyst bed. The transparent bumps reduce these gaps and reduce the flow rate of the mixed liquid in the channel per unit time, thereby reducing the speed of the mixed liquid flowing through the catalyst bed, increasing the contact time between the mixed liquid and the catalyst, and making the reaction effect of the mixed liquid better. The setting of the transparent bumps makes the channel route through which the mixed liquid passes more tortuous and complex, and also increases the contact time between the mixed liquid and the catalyst, thereby further improving the reaction effect of the mixed liquid and the production quality of 2,5-dimethoxydihydrofuran.

[0022] 5. The setting of the diverter screen plays a buffering role on the mixed liquid entering the tank body from the feed port, thereby reducing the flow rate of the mixed liquid, thereby avoiding the situation where the mixed liquid flows through the catalyst bed quickly, thereby increasing the contact time between the mixed liquid and the catalyst and improving the reaction effect of the mixed liquid; at the same time, the setting of the diverter screen can enable the mixed liquid entering the tank body from the feed port to flow into the catalyst bed relatively evenly, so that the ceramic balls in the catalyst bed can all contact with the mixed liquid, thereby trying to make the photocatalyst on the surface of all ceramic balls able to play the catalytic effect of the photocatalyst itself, thereby further improving the utilization rate of the photocatalyst; in addition, the use of the diverter screen and the second drive member can make the diverter screen in a shaking state. On the one hand, the shaking of the diverter screen can make the mixed liquid mix more evenly, thereby making the subsequent catalytic reaction effect better. On the other hand, the shaking diverter screen can also avoid the situation where the debris in the mixed liquid blocks the sieve holes of the diverter screen, thereby trying to ensure that the mixed liquid can flow into the catalyst bed normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0024] Figure 2 It is a schematic diagram of the internal structure of an embodiment of the present application;

[0025] Figure 3 yes Figure 2 A magnified schematic diagram of point A in the middle;

[0026] Figure 4 This is a schematic diagram of the structure of the ceramic ball in the embodiment of the present application;

[0027] Figure 5 This is a schematic structural diagram of the diverter screen in the embodiment of the present application;

[0028] Figure 6 This is a schematic structural diagram of the second driving member in an embodiment of the present application;

[0029] Figure 7 yes Figure 6 A magnified schematic diagram of point B in the middle;

[0030] Figure 8 This is a schematic structural diagram of the stirring roller in an embodiment of the present application;

[0031] In the figure, 1. tank body; 11. feed port; 12. discharge port; 13. chute; 2. catalyst bed; 21. support net; 22. ceramic ball; 23. transparent bump; 3. lighting device; 31. rotating shaft; 32. stirring roller; 33. rotating motor; 34. lamp ring; 4. circulation component; 41. ball guide tube; 411. top hole; 42. first driving member; 43. top rod; 5. diverter component; 51. diverter screen; 511. sieve hole; 512. through hole; 52. second driving member; 521. toggle rod; 522. roller; 53. toggle block; 531. wave trough. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-8 , further details of this application are given.

[0033] A photocatalytic reactor for the production of 2,5-dimethoxydihydrofuran, Figure 1 、 Figure 2 and Figure 4 , including a tank body 1, a catalyst bed 2, a lighting device 3 and a circulation component 4.

[0034] The tank body 1 in this embodiment is cylindrical, with a feed port 11 provided on the upper end surface of the tank body 1, a discharge port 12 provided at the bottom of the tank body 1, and an air guide port provided on the peripheral wall of the tank body 1. In this embodiment, valves are provided at the feed port 11, the discharge port 12 and the air guide port.

[0035] The catalyst bed 2 in this embodiment includes two support nets 21, which are arranged in a vertical direction and fixedly mounted on the inner wall of the tank body 1. The two support nets 21 are arranged coaxially with the tank body 1. The space between the two support nets 21 is filled with a plurality of ceramic balls 22. The plurality of ceramic balls 22 fill the space between the two support nets 21, and the diameter of each ceramic ball 22 is larger than the mesh of the support net 21, so that the ceramic ball 22 cannot pass through the mesh of the support net 21. The surface of each ceramic ball 22 is adhered with a photocatalyst. The catalyst in this embodiment is Ti O2, TiO2 is loaded on the surface of the ceramic ball 22 by the impregnation-calcination method, that is, the TiO2 precursor is dissolved in a solvent (ethanol or water), and then the ceramic ball 22 is placed in the solution, and TiO2 is promoted to penetrate into the surface of the ceramic ball 22 by ultrasound or vacuum, and then the excess solvent on the surface of the ceramic ball 22 is removed by drying, and finally the ceramic ball 22 is calcined, and finally a catalyst layer is formed on the surface of the ceramic ball 22, thereby realizing the catalyst loading on the surface of the ceramic ball 22. This is a prior art and will not be elaborated on here.

[0036] The lighting device 3 in this embodiment includes a rotating shaft 31 .

[0037] The rotating shaft 31 is coaxially rotatably mounted on the upper end surface of the tank body 1. The upper end surface of the rotating shaft 31 extends to the outside of the tank body 1. A rotating motor 33 is also provided on the upper end of the tank body 1. The output shaft of the rotating motor 33 is coaxially fixedly connected to the rotating shaft 31. The end of the rotating shaft 31 away from the rotating motor 33 is located inside the tank body 1 and extends into the space between the two support nets 21. A through hole 512 for the rotating shaft 31 to pass through is opened on the support net 21 at the upper end. The peripheral wall of the rotating shaft 31 is connected to the upper support net 21. The hole walls of the through holes 512 on the net 21 are in sliding contact. In this embodiment, a plurality of stirring rollers 32 are provided on the peripheral wall of the rotating shaft 31. The plurality of stirring rollers 32 are evenly spaced around the axis of the rotating shaft 31. The stirring rollers 32 in this embodiment are lamp tubes, that is, the exterior of the stirring rollers 32 is high fluorine silicate glass. High fluorine silicate glass itself has high light transmittance, low thermal expansion coefficient, excellent heat and shock resistance, and high bending strength. The interior of the stirring roller 32 is a wick, which can release ultraviolet light.

[0038] The circulation component 4 in this embodiment is installed in the tank body 1, and the circulation component 4 can export a number of ceramic balls 22 in the space between the two support nets 21 out of the space, and then re-import them into the space. In the process of the circulation component 4 exporting and re-importing the ceramic balls 22 in the space between the two support nets 21, the lighting device 3 can still illuminate the exported ceramic balls 22.

[0039] When 2,5-dimethoxydihydrofuran needs to be produced, the rotating motor 33, the lamp (stirring roller 32) and the circulation component 4 are started at the same time. After the rotating motor 33 is started, the rotating motor 33 drives the rotating shaft 31 to rotate, thereby driving the stirring roller 32 on the rotating shaft 31 to rotate, and the stirring roller 32 begins to stir the ceramic balls 22 pile between the two support nets 21. During the stirring process, the stirring roller 32 can try to contact each ceramic ball 22 in the ceramic ball pile 22. Since the stirring roller 32 in this embodiment is configured as a lamp, Therefore, the light emitted by the lamp can illuminate the surface of each ceramic ball 22 as much as possible, and while the stirring roller 32 stirs the ceramic ball 22 pile between the two support nets 21, the circulation component 4 can export the ceramic balls 22 between the two support nets 21 one by one, and then import the exported balls one by one between the two support nets 21, so that the position of each ceramic ball 22 between the two support nets 21 will be disrupted and reorganized, and after the position of each ceramic ball 22 between the two support nets 21 is disrupted and reorganized, the ceramic balls 22 located in the dead corner of the space between the two support nets 21 can also contact the stirring roller 32, so that all the ceramic balls 22 can be illuminated as a whole, and in the process of exporting and importing the ceramic balls 22, the illumination device 3 can also illuminate the exported ceramic balls 22, so as to further ensure that the light emitted by the lamp can illuminate the surface of each ceramic ball 22 in the catalyst bed 2 as much as possible, and the photocatalyst on the surface of the ceramic ball 22 begins to react after receiving the irradiation of light, so 2,5-dimethoxybenzyl alcohol will be generated at this time. When the mixed liquid of 2,5-dimethoxydihydrofuran is introduced into the tank body 1 from the feed port 11, the mixed liquid will pass through the mesh of the support net 21 and enter the gaps between the ceramic balls 22. The mixed liquid will come into contact with the photocatalyst on the surface of the ceramic balls 22. Under the action of light, the photocatalyst will begin to catalyze the chemical reaction of the mixed liquid, thereby producing a 2,5-dimethoxydihydrofuran solution. The generated 2,5-dimethoxydihydrofuran solution will continue along the gaps between the ceramic balls 22, then pass through the mesh of the lower support net 21, and finally fall to the bottom of the tank body 1.

[0040] In the above process, the stirring roller 32 can stir the pile of ceramic balls 22 between the two support nets 21, so that the stirring roller 32 can contact each ceramic ball 22 between the two support nets 21 as much as possible, so that each ceramic ball 22 between the two support nets 21 can receive the irradiation of the light emitted by the lamp (stirring roller 32). At the same time, the positions of all the ceramic balls 22 between the two support nets 21 are disrupted and reorganized by the circulation component 4. Therefore, the circulation component 4 can rearrange the ceramic balls 22 in the dead corners in the space between the two support nets 21 (that is, the ceramics that the stirring roller 32 cannot contact) to a position that can contact the stirring roller 32, thereby further ensuring that all the ceramic balls 22 between the two support nets 21 can contact The stirring roller 32 is in contact with the stirring roller 32, that is, it can be irradiated by the light emitted by the lamp tube. In the prior art, the lighting device is directly set on the inner wall of the tank body 1 or inside the pile of ceramic balls 22. Since the stacking of the ceramic balls 22 between the two support nets 21 will cause part of the ceramic balls 22 to be blocked, the ceramic balls 22 in this part cannot receive the irradiation of the light emitted by the lighting device. Therefore, compared with the prior art, the device in the present application can enable all the ceramic balls 22 between the two support nets 21 to receive light, thereby greatly improving the utilization efficiency of the photocatalyst on the surface of all ceramic balls 22 in the device in the present application, thereby making the reaction of the mixed liquid to generate 2,5-dimethoxydihydrofuran as thorough as possible, thereby improving the production quality of 2,5-dimethoxydihydrofuran.

[0041] Reference Figure 2 、 Figure 3 and Figure 6 The circulation component 4 in this embodiment includes a ball guide tube 41. The ball guide tube 41 in this embodiment is set to a square ring with a notch on one side, and the ball guide tube 41 in this embodiment is set to be transparent. The ball guide tube 41 is arranged in the vertical direction, and the ball guide tube 41 passes through the catalyst bed 2, that is, passes through the upper support net 21 and the lower support net 21. The upper end of the notch on the ball guide tube 41 is inserted from the upper support net 21 into the space between the two support nets 21, and the lower end of the notch on the ball guide tube 41 and the lower support net 21 are inserted into the space between the two support nets 21. The ball guide tube 41 is close to the catalyst bed 2, that is, the upper support net 21 and the lower support net 21 are inserted into the space between the two support nets 21. A top hole 411 is provided at the corner of the lower end notch, and the top hole 411 is arranged in the horizontal direction. A top rod 43 and a first driving member 42 are provided on the lower end surface of the lower end support net 21. The first driving member 42 in this embodiment includes an electric push rod, which is fixedly installed on the lower end surface of the lower end support net 21 in the horizontal direction. The top rod 43 is coaxially fixed on the output shaft of the electric push rod, and the end of the top rod 43 away from the electric push rod is slid into the top hole 411. In this embodiment, the aperture of the top hole 411 is the same as the inner diameter of the ball guide tube 41, and the diameter of the top rod 43 is the same as the aperture of the top hole 411.

[0042] In this embodiment, the lighting device 3 also includes a lamp ring 34. In this embodiment, two lamp rings 34 are provided, one of which is fixedly mounted on the lower end surface of the lower support net 21, and the lamp ring 34 is coaxially sleeved on the ball guide tube 41. The outer peripheral wall of the ball guide tube 41 does not abut against the lamp ring 34. The other lamp ring 34 is fixedly mounted on the upper end surface of the upper support net 21, and is also coaxially sleeved on the ball guide tube 41. The ball guide tube 41 in this embodiment is made of transparent glass.

[0043] When the push rod 43 is in the initial position, the end of the push rod 43 away from the electric push rod is not directly inserted into the ball guide tube 41, and the end of the push rod 43 away from the electric push rod just blocks the top hole 411 on the ball guide tube 41. Therefore, when the ceramic balls 22 between the two support nets 21 need to be arranged and reorganized, the electric push rod is started, and the output shaft of the electric push rod is extended in the initial state. Then, the electric push rod drives the push rod 43 to insert into the ball guide tube 41, and then the ceramic balls 22 in contact with the push rod 43 in the ball guide tube 41 will be pushed by the push rod 43 (thrust to the left). Then, because the ceramic balls 22 are abutted against each other in sequence, the push rod 43 can push the ceramic balls 22 in the ball guide tube 41 at the push rod 43. All the ceramic balls 22 on the left side move along the top of the ball guide tube 41, and the ceramic balls 22 located at the connection between the ball guide tube 41 and the upper support net 21 are squeezed into the two support nets 21 under the action of the thrust of the push rod 43. After the push rod 43 is inserted into the distance of one end of the ball guide tube 41, the electric push rod immediately contracts quickly, bringing the push rod 43 back to its initial position. Since the electric push rod contracts at a relatively fast speed, the ceramic balls 22 in the ball guide tube 41 will be relatively still for a period of time or the reflux speed will be slow due to inertia. At this time, the ceramic balls 22 in the two support nets 21 will fall into the ball guide tube 41 from the connection between the lower support net 21 and the ball guide tube 41 under the action of gravity, and from the two support nets 21 The ceramic ball 22 that falls into the ball guide tube 41 will come into contact with the end of the push rod 43 away from the electric push rod, and then the electric push rod is started, causing the electric push rod to extend, and then the push rod 43 is inserted into the interior of the ball guide tube 41 again, and the ceramic ball 22 at the connection between the ball guide tube 41 and the upper support net 21 is squeezed between the two support nets 21, and the electric push rod immediately contracts to drive the push rod 43 back to its initial position, and the ceramic ball 22 between the two support nets 21 falls from the connection between the lower support net 21 and the ball guide tube 41 to the ball guide tube 41. According to the above-mentioned cycle process, the ceramic balls 22 inside the two support nets 21 fall from the connection between the lower support net 21 and the ball guide tube 41 to the ball guide tube 41, and then the ball guide tube 41 and the upper support net The ceramic balls 22 at the connection point 21 are squeezed into between the two support nets 21, thereby realizing the circulation flow of the ceramic balls 22 in the two support nets 21 as a whole, that is, realizing the arrangement and reorganization of the positions of the ceramic balls 22 between the two support nets 21; at the same time, no matter whether the ceramic balls 22 fall from between the two support nets 21 into the ball guide tube 41 or the ceramic balls 22 enter between the two support nets 21 from the ball guide tube 41, the two light rings 34 can also irradiate the ceramic balls 22 in the ball guide tube 41 with light, so that the photocatalytic reaction on the surface of the ceramic balls 22 in the ball guide tube 41 also takes effect, so as to ensure that the part of the mixed liquid carried by the ceramic balls 22 and entering the ball guide tube 41 can also react completely.

[0044] It should be noted that the push rod 43 is in the initial position, that is, the end of the push rod 43 away from the electric push rod just blocks the top hole 411 on the ball guide tube 41, so the push rod 43 will not block the path of the ceramic balls 22 in the two support nets 21 to fall into the ball guide tube 41, and since the end of the push rod 43 away from the electric push rod just blocks the top hole 411 on the ball guide tube 41, the ceramic balls 22 in the ball guide tube 41 will not roll out from the top hole 411. In addition, in order to avoid as much as possible that the ceramic balls 22 between the two support nets 21 cannot fall into the ball guide tube 41 from the connection between the lower support net 21 and the ball guide tube 41, in this embodiment, the lower support net 21 is configured to be funnel-shaped, and the connection between the lower support net 21 and the ball guide tube 41 is the lowest point of the lower support net 21. Therefore, the ceramic balls 22 between the two support nets 21 can move along the connection between the lower support net 21 and the ball guide tube 41 under the action of gravity.

[0045] Among them, in this embodiment, the surface of the ceramic ball 22 is uniformly arrayed with multiple transparent bumps 23. The most convex point of each transparent bump 23 in this embodiment is on the same spherical surface, and the center of the spherical surface coincides with the center of the ceramic ball 22. That is, the ceramic ball 22 with multiple transparent bumps 23 can continue to be regarded as a sphere with a concave surface, and the inner diameter of the ball guide tube 41 is slightly larger than the maximum diameter of the sphere with a concave surface. In addition, the transparent bumps 23 in this embodiment are made of silicone rubber, and transparent silicone has good light transmittance and elasticity. First, the ceramic ball 22 itself is made of ceramic material, even if there is light on its surface The surface of the ceramic ball 22 is relatively smooth, and the transparent protrusion 23 is adhered to the surface of the ceramic ball 22 by glue. The glue in this embodiment is a transparent UV curing glue, and the stirring roller 32 in this embodiment is set as a lamp tube, and the surface of the lamp tube is also made of transparent glass. Therefore, the friction between the stirring roller 32 and the ceramic ball 22 is relatively small. When the stirring roller 32 stirs in the pile of ceramic balls 22, the stirring roller 32 cannot completely stir the ceramic balls 22 between the two support nets 21. The transparent protrusion 23 is set on the surface of the ceramic ball 22, which can well increase the friction between the ceramic ball 22 and the stirring roller 32. The friction force of the stirring roller 32 is increased, so when the stirring roller 32 stirs in the pile of ceramic balls 22, the stirring roller 32 can not only contact with all the ceramic balls 22 between the two support nets 21 as much as possible, so that the light emitted by the stirring roller 32 (lamp tube) can be irradiated on all the ceramic balls 22 as much as possible, and because the friction force between the ceramic balls 22 and the stirring roller 32 increases, when the stirring roller 32 stirs in the pile of ceramic balls 22, the stirring roller 32 can also drive the ceramic balls 22 to rotate, so the contact point between the stirring roller 32 and the surface of the ceramic balls 22 will also change. As the stirring roller 32 continues to stir, the stirring roller 32 can contact with all the ceramic balls 22 as much as possible. It can make contact with every part of the surface of the ceramic ball 22, so that every part of the surface of the ceramic ball 22 can receive light. At the same time, the transparent protrusion 23 can also increase the friction between the ceramic balls 22 and the ceramic balls 22. Therefore, when the stirring roller 32 causes the ceramic balls 22 in contact with it to rotate, the rotating ceramic ball 22 can also drive the ceramic balls 22 in contact with it to rotate as well. And because the ceramic balls 22 are in contact in sequence, the ceramic balls 22 between the two support nets 21 can all rotate, so that every part of the surface of the ceramic ball 22 can be illuminated by the light emitted by the stirring roller 32.

[0046] Therefore, in general, the transparent protrusions 23 on the surface of the ceramic balls 22 increase the friction between the stirring roller 32 and the ceramic balls 22, and the friction between the ceramic balls 22 and the ceramic balls 22, so that the rotation of the stirring roller 32 drives the ceramic balls 22 to rotate, and then the rotating ceramic balls 22 drive the rotation of the adjacent ceramic balls 22, thereby driving all the ceramic balls 22 between the two support nets 21 to rotate as much as possible. Therefore, the positions of the surfaces of all the ceramic balls 22 between the two support nets 21 that are in contact with the stirring roller 32 or facing the stirring roller 32 are always in a changing state, and through the coordinated use of the circulation component 4, the positions of all the ceramic balls 22 between the two support nets 21 are changed, that is, the dead space between the two support nets 21 is changed. The ceramic balls 22 at the corners can also contact the stirring roller 32 or be illuminated by the light emitted by the stirring roller 32. Therefore, under the stirring and rotation of the ceramic balls 22 by the stirring roller 32 and the rearrangement of the positions of the ceramic balls 22 by the circulation component 4, it is further ensured that all the ceramic balls 22 between the two support nets 21 can be illuminated by the light emitted by the stirring roller 32, and every part of the surface of the ceramic balls 22 can be illuminated by the light emitted by the stirring roller 32, thereby greatly improving the utilization rate of the photocatalyst on the surface of the ceramic balls 22 in this embodiment, and thus greatly improving the catalytic effect of the photocatalyst on the mixed liquid in this embodiment, and improving the production quality of 2,5-dimethoxydihydrofuran.

[0047] As is known from the foregoing, the channel for the mixed liquid to flow through the catalyst bed 2 in this embodiment is the gap between each ceramic ball 22, and in this embodiment, the surface of each ceramic ball 22 is provided with a transparent protrusion 23. Therefore, when a plurality of ceramic balls 22 are piled up between the two support nets 21, the transparent protrusion 23 on the ceramic ball 22 will extend into the gap between the ceramic balls 22 and the ceramic balls 22. Therefore, when the mixed liquid flows through the gap between the ceramic balls 22 and the ceramic balls 22, the transparent protrusion 23 on the ceramic ball 22 can block the mixed liquid to a certain extent, thereby slowing down the mixed liquid flowing through the ceramic ball 22. The speed of the gap between the ceramic balls 22 and the transparent protrusions 23 makes the channel through which the mixed liquid flows more tortuous and complex, thereby increasing the time for the mixed liquid to flow through the gap between the ceramic balls 22 and the ceramic balls 22, and thus making the contact time between the mixed liquid and the surface of the ceramic balls 22 longer as a whole, that is, increasing the contact time between the mixed liquid and the photocatalyst on the surface of the ceramic balls 22, thereby greatly improving the catalytic effect of the photocatalyst on the surface of the ceramic balls 22 on the mixed liquid, and further improving the reaction effect of the mixed liquid and the production quality of 2,5-dimethoxydihydrofuran.

[0048] Also according to the above, the setting of the transparent protrusion 23 in this embodiment enables the stirring roller 32 to drive the plurality of ceramic balls 22 between the two support nets 21 to rotate when stirring. At the same time, while the plurality of ceramic balls 22 are rotating, the transparent protrusion 23 on the ceramic balls 22 will also move in space. Since the transparent protrusion 23 is part of the channel through which the mixed liquid flows, the channel through which the mixed liquid flows will be in a constantly changing state during the movement of the transparent protrusion 23. The bending and dynamic deformation of the channel will force the mixed liquid to continuously change direction, and the actual flow path will be significantly increased compared to the straight-line distance, directly increasing the flow rate. The time for the mixed liquid to pass through, and when the shape of the channel changes rapidly, the inertia of the mixed liquid will conflict with the movement of the transparent protrusion 23, which can easily induce turbulence or separation vortex in the mixed liquid. The generation of turbulence or separation vortex can greatly consume the kinetic energy of the mixed liquid, that is, reduce the flow speed of the mixed liquid. Therefore, when stirring, the stirring roller 32 can change the flow path of the mixed liquid at all times, thereby further reducing the flow speed of the mixed liquid and increasing the flow time of the mixed liquid, thereby further increasing the contact time between the mixed liquid and the photocatalyst on the surface of the ceramic ball 22 and improving the catalytic effect of the photocatalyst on the surface of the ceramic ball 22 on the mixed liquid.

[0049] Secondly, since the transparent protrusion 23 in this embodiment is made of transparent silicone, and transparent silicone can reflect and refract light to a certain extent, when the light emitted by the stirring roller 32 reaches the transparent protrusion 23, the transparent protrusion 23 can reflect or refract the light emitted from the stirring roller 32 to the surface of the adjacent ceramic ball 22, thereby further improving the utilization rate of the photocatalyst. The setting of the transparent protrusion 23 can reduce the space between the ceramic balls 22 and increase the curvature of the gap between the ceramic balls 22. Therefore, most of the light emitted by the stirring roller 32 is either absorbed by the photocatalyst on the surface of the ceramic ball 22, or is reflected or refracted by the protrusions on the surface of the ceramic ball 22 multiple times to the surface of other ceramic balls 22 and absorbed. This reduces the probability of the light emitted from the stirring roller 32 to pass out of the catalyst bed 2, so that the light emitted from the stirring roller 32 can be fully absorbed and utilized, greatly improving the utilization rate of light energy of the equipment, not only further improving the reaction effect of the photocatalyst, but also reducing the loss of light energy.

[0050] In addition, refer to Figure 2 and Figure 8The stirring roller 32 in this embodiment is configured to be in a "bow" shape, and multiple stirring rollers 32 are evenly spaced around the axis of the rotating shaft 31. In this embodiment, each stirring roller 32 is sequentially sleeved with a larger "bow"-shaped stirring roller 32 in the direction away from the rotating shaft 31, and each stirring roller 32 sequentially sleeved in the direction away from the rotating shaft 31 is similarly arranged. Such a design enables the stirring roller 32 to cover a larger range in the horizontal and vertical spaces. Therefore, when the stirring roller 32 stirs the pile of ceramic balls 22, the light emitted from the stirring roller 32 can cover a wider range, thereby further ensuring that each ceramic ball 22 in the pile of ceramic balls 22 can receive light, thereby further improving the reaction effect of the photocatalyst.

[0051] Reference Figure 2 、 Figure 5 、 Figure 6 and Figure 7In this embodiment, a diversion component 5 is further provided on the inner wall of the tank body 1. The diversion component 5 in this embodiment includes a diversion screen 51. The diversion screen 51 is configured as a cylindrical container with an opening at the upper end. A plurality of sieve holes 511 are uniformly arranged at the bottom of the diversion screen 51. The diversion screen 51 is coaxially mounted on the inner wall of the tank body 1, and the diversion screen 51 is located on the upper end surface of the upper support net 21. When the mixed liquid enters from the feed port 11 on the tank body 1, the mixed liquid will first fall into the diversion screen 51, and then fall from the sieve holes 511 on the diversion screen 51 to the upper support net 21. The mixed liquid flows through the mesh of the upper support mesh 21 and then flows into the ceramic ball pile 22 between the two support meshes 21, and then flows from the gap between the ceramic balls 22 and the ceramic balls 22 to the lower support mesh 21. Finally, the mixed liquid passes through the mesh of the lower support mesh 21 and falls on the lower end of the tank body 1. In this process, the diverter screen 51 first receives the mixed liquid entering the tank body 1 from the feed port 11. The diverter screen 51 can play a buffering role for these mixed liquids, greatly reducing the falling speed of the mixed liquid from top to bottom, thereby avoiding the mixed liquid speed from the bottom to the bottom. The mixed liquid flows through the catalyst bed 2 too fast, thereby increasing the contact time between the mixed liquid and the catalyst and improving the reaction effect of the mixed liquid; then, since the mesh holes on the diverter screen 51 are arranged in an evenly spaced array, the mixed liquid in the diverter screen 51 can be relatively evenly distributed in the space inside the tank body 1, so the mixed liquid will not be concentrated at a certain point on the upper support net 21 and enter the pile of ceramic balls 22, thereby avoiding the situation where only a few of the ceramic balls 22 in the pile can contact the mixed liquid, which will not only lead to the waste of photocatalysts on other ceramic balls 22, but may also cause the mixed liquid to react incompletely, reducing the production quality of 2,5-dimethoxydihydrofuran. Therefore, through the setting of the diverter screen 51, the mixed liquid can fall into every place in the ceramic balls 22 at a lower speed and relatively evenly, so that every ceramic ball 22 in the pile of ceramic balls 22 can contact the mixed liquid, thereby further improving the utilization rate of the photocatalyst on the surface of the ceramic balls 22 and improving the production quality of 2,5-dimethoxydihydrofuran.

[0052] At the same time, this embodiment also provides a second driving member 52. The second driving member 52 in this embodiment includes a toggle rod 521 and a toggle block 53. The toggle rod 521 is fixedly mounted on the outer peripheral wall of the rotating shaft 31 in the vertical direction. The toggle block 53 is coaxially fixedly mounted on the lower end surface of the diverter screen 51, and the toggle block 53 is coaxially slidably sleeved on the rotating shaft 31. The lower end surface of the toggle block 53 is provided with a wave groove 531. The highest point of the toggle rod 521 is provided with a roller 522. The roller 522 slides and rotates with the groove wall of the wave groove 531. A slide groove 13 is opened on the inner peripheral wall of the tank body 1 in the vertical direction. The diverter screen 51 is located in the slide groove 13, and the peripheral wall of the diverter screen 51 slides and abuts against the groove wall of the slide groove 13. A through hole 512 for the rotating shaft 31 to pass through is coaxially opened on the diverter screen 51. The hole wall of the through hole 512 on the diverter screen 51 slides and abuts against the outer peripheral wall of the rotating shaft 31.

[0053] Before the mixed liquid is poured into the feed port 11 of the tank body 1, the rotating motor 33 is started, the rotating motor 33 drives the rotating shaft 31 to rotate, and the rotating shaft 31 drives the toggle rod 521 to rotate around the axis of the rotating shaft 31. The roller 522 at the upper end of the toggle rod 521 is always in contact with the groove wall of the wave groove 531 on the diverter screen 51. However, since the groove wall of the wave groove 531 is continuously undulating, the height of the roller 522 at the upper end of the toggle rod 521 cannot be changed. Therefore, when the contact point between the roller 522 on the toggle rod 521 and the wave groove 531 moves from the valley point to the peak point, the wave rod will push the diverter screen 51 to move up, and the roller When the contact point between 522 and the wave groove 531 moves from the peak point to the valley point, the diverter screen 51 falls under the action of gravity. As the contact point between the roller 522 on the toggle rod 521 and the wall of the wave groove 531 continues to change, the diverter screen 51 can be driven to shake up and down in the chute 13. On the one hand, the shaking of the diverter screen 51 can make the mixed liquid mix more evenly, thereby making the subsequent catalytic reaction effect better. On the other hand, the shaking diverter screen 51 can also avoid the situation where the debris in the mixed liquid blocks the sieve hole 511 of the diverter screen 51, thereby ensuring that the mixed liquid can flow into the catalyst bed 2 normally.

[0054] Finally, it should be noted that the rotating motor 33 and the electric push rod and other equipment in this embodiment are all controlled and driven by the control center, specifically by a system such as a PLC.

[0055] The working principle of the photocatalytic reactor for producing 2,5-dimethoxydihydrofuran in this embodiment is as follows: when 2,5-dimethoxydihydrofuran needs to be produced, the rotating motor 33, the lamp tube (stirring roller 32), the lamp ring 34 and the electric push rod are started, the rotating motor 33 rotates to drive the rotating shaft 31 to rotate, the rotating motor 33 drives the rotating shaft 31 to rotate, thereby driving the stirring roller 32 on the rotating shaft 31 to rotate, and the stirring roller 32 begins to stir in the ceramic ball pile 22 between the two support nets 21. During the stirring process, the stirring roller 32 can The stirring roller 32 can make contact with each ceramic ball 22 in the pile of ceramic balls 22 as much as possible. Since the stirring roller 32 in this embodiment is configured as a lamp tube, the light emitted by the lamp tube can illuminate the surface of each ceramic ball 22 as much as possible. Due to the provision of the transparent protrusion 23, the friction between the stirring roller 32 and the ceramic balls 22, as well as between the ceramic balls 22 and the ceramic balls 22, is increased. The stirring roller 32 can drive the ceramic balls 22 between the two supporting nets 21 to rotate, so that other parts of the surface of the ceramic ball 22 can also be illuminated by the stirring roller 32.

[0056] At the same time, the extension and contraction of the electric push rod drives the push rod 43 to slide into the interior of the ball guide tube 41 and slide out of the ball guide tube 41, thereby pushing the ceramic balls 22 that fall from the lower support net 21 into the ball guide tube 41 upward along the ball guide tube 41, and the ceramic balls 22 at the connection point between the ball guide tube 41 and the upper support net 21 re-enter between the two support nets 21, thereby realizing the circulation of the ceramic balls 22 in the two support nets 21, so that the positions of the ceramic balls 22 in the two support nets 21 are changed, so that each ceramic ball 22 can be subjected to the stirring light, and the light ring 34 can also illuminate the ceramic balls 22 in the ball guide tube 41. After all the ceramic balls 22 have been illuminated to a certain extent, the mixed liquid is poured into the feed port 11 of the tank body 1, and the mixed liquid will first fall into the diverter screen 51, and the rotating motor 33 drives the rotating shaft 31 to rotate, and the rotating shaft 31 drives the dial The movable rod 521 rotates around the axis of the rotating shaft 31, and the roller 522 at the upper end of the toggle rod 521 is always in contact with the groove wall of the wave groove 531 on the diverter screen 51. Since the groove wall of the wave groove 531 is continuously undulating, the toggle rod 521 drives the diverter screen 51 to shake up and down in the chute 13, and then the mixed liquid falls from the sieve holes 511 on the diverter screen 51 onto the upper support net 21, and then passes through the mesh holes of the upper support net 21 and flows into the pile of ceramic balls 22 between the two support nets 21, and then flows from the gap between the ceramic balls 22 to the lower support net 21, and finally the mixed liquid passes through the mesh holes of the lower support net 21 and falls on the lower end part of the tank body 1. When the produced dimethoxydihydrofuran needs to be collected or transported, the discharge port 12 is opened and the produced dimethoxydihydrofuran can be transported or filled with other equipment.

[0057] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A photocatalytic reactor for the production of 2,5-dimethoxydihydrofuran, characterized in that: include: A tank body (1), wherein a feed port (11) is provided above the tank body (1), and a discharge port (12) is provided below the tank body (1); a catalyst bed (2), comprising two support nets (21), the two support nets (21) being arranged in a vertical direction and mounted on the inner wall of the tank body (1), a plurality of ceramic balls (22) being filled between the two support nets (21), and each of the ceramic balls (22) being adhered with a photocatalyst; an illumination device (3), comprising a rotating shaft (31), the rotating shaft (31) being coaxially rotatably mounted on the upper end of the tank body (1), one end of the rotating shaft (31) extending to the outside of the tank body (1) and being coaxially fixedly connected to a rotating motor (33), the other end of the rotating shaft (31) extending between the two support nets (21), a plurality of stirring rollers (32) being provided on the outer wall of the rotating shaft (31) between the two support nets (21), and each stirring roller (32) being a lamp tube; The circulation component (4) is used to guide the plurality of ceramic balls (22) in the catalyst bed (2) out and then reintroduce them into the catalyst bed (2). During the process of the circulation component (4) guiding the ceramic balls out of the catalyst bed (2) and reintroducing them into the catalyst bed (2), the illumination device (3) can also illuminate the guided ceramic balls (22); The stirring roller (32) is arranged in a "bow" shape, and a plurality of stirring rollers (32) are evenly spaced around the axis of the rotating shaft (31). Each stirring roller (32) is sequentially sleeved with a larger "bow"-shaped stirring roller (32) in a direction away from the rotating shaft (31), and each stirring roller (32) sequentially sleeved in a direction away from the rotating shaft (31) is also evenly spaced. A plurality of transparent bumps (23) are provided on the surface of each ceramic ball (22), each transparent bump (23) is made of elastic material, and the transparent bump (23) is capable of refracting and reflecting light; The circulation assembly (4) includes a ball guide tube (41), which is arranged to pass through the entire catalyst bed (2) in a vertical direction. The upper end of the ball guide tube (41) is bent and inserted into the catalyst bed from the upper end of the catalyst bed (2). The lower end of the ball guide tube (41) is also bent and inserted into the catalyst bed (2) from the lower end of the catalyst bed (2). A top hole (411) is opened at the bend of the lower end of the ball guide tube (41). A push rod (43) is slidably provided on the support net (21), one end of the push rod (43) is slidably inserted into the top hole (411), and a first driving member (42) is provided on the lower end support net (21) for driving the push rod (43) to slide back and forth. The inner diameter of the ball guide tube (41) is the same as the diameter of the ceramic ball (22), the aperture of the top hole (411) is the same as the inner diameter of the ball guide tube (41), and the diameter of the push rod (43) is the same as the aperture of the top hole (411).

2. A photocatalytic reactor for producing 2,5-dimethoxydihydrofuran according to claim 1, characterized in that: A diversion assembly (5) is further provided on the inner wall of the tank body (1), and the diversion assembly (5) includes a diversion screen (51). The diversion screen (51) is coaxially located above the catalyst bed (2), and the peripheral wall of the diversion screen (51) abuts against the inner wall of the tank body (1). A through hole (512) for the rotating shaft (31) to pass through is provided at the center of the diversion screen (51), and the hole wall of the through hole (512) abuts against the peripheral wall of the rotating shaft (31). The diversion screen (51) is provided with an array of sieve holes (511) for the mixed liquid to flow through.

3. A photocatalytic reactor for producing 2,5-dimethoxydihydrofuran according to claim 2, characterized in that: A chute (13) is provided on the inner wall of the tank body (1) in a vertical direction. The diverter screen (51) is located in the chute (13), and the peripheral wall of the diverter screen (51) is in sliding contact with the groove wall of the chute (13). The hole wall of the through hole (512) is in sliding contact with the peripheral wall of the rotating shaft (31). The rotating shaft (31) is also provided with a second driving member (52) for driving the diverter screen (51) to slide back and forth.

4. A photocatalytic reactor for producing 2,5-dimethoxydihydrofuran according to claim 3, characterized in that: The second driving member (52) includes a toggle rod (521) and a toggle block (53), wherein the toggle rod (521) is fixedly mounted on the outer peripheral wall of the rotating shaft (31) in the vertical direction, and the toggle block (53) is coaxially fixedly mounted on the lower end surface of the diverter screen (51) and coaxially slidably sleeved on the rotating shaft (31), and the lower end surface of the toggle block (53) is provided with a wave groove (531), and the highest point of the toggle rod (521) is provided with a roller (522), and the roller (522) is in sliding and rotational contact with the groove wall of the wave groove (531).

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