Photocatalytic reaction kettle for producing 2, 5-dimethoxydihydrofuran

Abstract

The invention discloses a photocatalytic reaction kettle for producing 2, 5-dimethoxydihydrofuran, and relates to the technical field of reaction kettles.The photocatalytic reaction kettle comprises a tank body, a catalyst bed layer, an illumination device and a circulation assembly, the catalyst bed layer comprises two supporting nets, the two supporting nets are installed on the inner wall of the tank body, the space between the two supporting nets is filled with a plurality of ceramic balls, and the illumination device is installed on the outer wall of the tank body; a photocatalyst is adhered to each ceramic ball; the illumination device comprises a rotating shaft, the rotating shaft is rotationally installed at the upper end of the tank body and is coaxially and fixedly connected with a rotating motor, the other end of the rotating shaft extends to the position between the two supporting nets, a plurality of stirring rollers are arranged on the outer wall of the rotating shaft located between the two supporting nets, and each stirring roller is a lamp tube; and the circulating assembly is used for guiding out the plurality of ceramic balls in the catalyst bed layer and then guiding the ceramic balls into the catalyst bed layer again. The method has the advantages that the reaction of the mixed solution for generating the 2, 5-dimethoxy dihydrofuran can be thorough as much as possible, so that the production quality of the 2, 5-dimethoxy dihydrofuran is improved.

Description

Technical Field

[0001] This application relates to the technical field of reaction kettles, and particularly to a photocatalytic reaction kettle for the production of 2,5-dimethoxydihydrofuran. Background Art

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

[0003] The fixed-bed continuous-flow photocatalytic reaction kettle is an essential equipment for the production of 2,5-dimethoxydihydrofuran. In the prior art, a photocatalyst is fixed on a specific carrier (such as ceramic balls) in the fixed-bed continuous-flow photocatalytic reaction kettle, and the specific carriers together form a catalyst bed. Then, the catalyst bed is irradiated by a lighting device, and then the mixed solution for generating 2,5-dimethoxydihydrofuran is allowed to flow through the catalyst bed. Under the irradiation of the lighting device, the photocatalyst on the specific carriers in the catalyst bed can receive the light source and start to catalyze the mixed solution flowing into the catalyst bed, thereby producing 2,5-dimethoxydihydrofuran.

[0004] However, when the lighting device irradiates the specific carriers in the catalyst bed, the light emitted by the lighting device is difficult to irradiate all the photocatalysts on the specific carriers. Therefore, all the photocatalysts on the specific carriers are difficult to exert their full catalytic effects, resulting in incomplete reaction of the mixed solution, generating incomplete reactants, and thus reducing the production quality of 2,5-dimethoxydihydrofuran. Summary of the Invention

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

[0006] A photocatalytic reaction kettle for the production of 2,5-dimethoxydihydrofuran provided by this application adopts the following technical solutions: A tank body, with a feed inlet arranged above the tank body and a discharge outlet arranged below the tank body; A catalyst bed, including two support meshes, the two support meshes are arranged vertically and installed on the inner wall of the tank body, and a number of ceramic balls are filled between the two support meshes, and each ceramic ball is adhered with a photocatalyst; A lighting device, comprising a rotating shaft coaxially and rotatably mounted at the upper end of a tank body. One end of the rotating shaft extends outside the tank body and is coaxially and fixedly connected to a rotating motor. The other end of the rotating shaft extends between two support meshes. A plurality of stirring rollers are arranged on the outer wall of the rotating shaft between the two support meshes, and each stirring roller is a lamp tube. A circulation assembly for discharging a number of ceramic balls in a catalyst bed layer and then reintroducing them into the catalyst bed layer. During the process of discharging and reintroducing the ceramic balls in the catalyst bed layer by the circulation assembly, the lighting device can also irradiate the discharged ceramic balls.

[0007] Optionally, the stirring rollers are arranged in a "bow" shape. A plurality of stirring rollers are evenly spaced around the axis of the rotating shaft. Each stirring roller is sequentially sleeved with a "bow" - shaped stirring roller with a larger volume in the direction away from the rotating shaft, and each sequentially sleeved stirring roller in the direction away from the rotating shaft is also evenly spaced.

[0008] Optionally, a plurality of transparent convex blocks are arranged on the surface of each ceramic ball. Each transparent convex block is made of an elastic material, and the transparent convex block can refract and reflect light.

[0009] Optionally, the circulation assembly includes a ball - guiding tube. The ball - guiding tube is arranged vertically through the entire catalyst bed layer. The upper end of the ball - guiding tube is bent and inserted into the catalyst bed from the upper end of the catalyst bed layer. The lower end of the ball - guiding tube is also bent and inserted into the catalyst bed layer from the lower end of the catalyst bed layer. A top hole is opened at the bent part of the lower end of the ball - guiding tube. A top rod is slidably arranged on the lower - end support mesh. One end of the top rod is slidably inserted into the top hole. A first driving member for driving the top rod to reciprocate is arranged on the lower - end support mesh. The inner diameter of the ball - guiding 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 - guiding tube. The diameter of the top rod is the same as the aperture of the top hole.

[0010] Optionally, a flow - dividing assembly is further arranged on the inner wall of the tank body. The flow - dividing assembly includes a flow - dividing sieve coaxially located above the catalyst bed layer, and the peripheral wall of the flow - dividing sieve abuts against the inner wall of the tank body. A through - hole for the rotating shaft to pass through is opened at the center of the flow - dividing sieve, and the hole wall of the through - hole abuts against the peripheral wall of the rotating shaft. The flow - dividing sieve is arrayed with sieve holes for the mixed liquid to flow through.

[0011] Optionally, a chute is vertically opened on the inner wall of the tank body. The flow - dividing sieve is located in the chute, and the peripheral wall of the flow - dividing sieve slidably abuts against the chute wall. The hole wall of the through - hole slidably abuts against the peripheral wall of the rotating shaft. A second driving member for driving the flow - dividing sieve to reciprocate up and down is further arranged on the rotating shaft.

[0012] Optionally, the second driving member includes a toggle rod and a toggle block. The toggle rod is fixedly installed on the outer peripheral wall of the rotating shaft in the vertical direction. The toggle block is coaxially and fixedly installed on the lower end surface of the shunt sieve and is coaxially and slidably sleeved on the rotating shaft. A wavy groove is provided on the lower end surface of the toggle block, and a roller is provided at the highest point of the toggle rod. The roller is in sliding and rotational abutment with the groove wall of the wavy groove.

[0013] In summary, the present application includes at least one of the following beneficial technical effects: 1. By providing the stirring roller, the stirring roller can stir among 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 provided as lamp tubes, the lamp tubes can contact each ceramic ball in the catalyst bed as much as possible. As a result, the light emitted by the lamp tubes can irradiate the surface of each ceramic ball in the catalyst bed as much as possible. Furthermore, the photocatalyst on the surface of each ceramic ball can receive light. And through the circulation component, the positions of each ceramic ball in the catalyst bed can be shuffled and recombined, which further ensures that each ceramic ball can contact the stirring roller, and further ensures that the light emitted by the lamp tubes 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 several ceramic balls, the photocatalyst can start to react and catalyze the mixed liquid. During this process, several ceramic balls are in a state of being stirred by the lamp tubes, and each photocatalyst on the surface of several ceramic balls can receive light as much as possible, so as to maximize the role of the photocatalyst and make the reaction of the mixed liquid for generating 2,5-dimethoxydihydrofuran as complete as possible, thereby improving the production quality of 2,5-dimethoxydihydrofuran.

[0014] 2. Transparent bumps are provided on the surface of each ceramic ball in the present application. First of all, the transparent bumps can increase the friction between the stirring roller and the ceramic balls. Therefore, when the stirring roller stirs among several ceramic balls, the stirring roller can drive the ceramic balls in contact with it to rotate, so that other parts on the surface of the ceramic balls can contact the stirring roller. As a result, the photocatalyst on the surface of the ceramic balls that re-contact the stirring roller can receive more sufficient light irradiation. Therefore, during the stirring process of the stirring roller, the stirring roller can drive multiple ceramic balls to rotate, and the transparent bumps 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 as to make the photocatalyst on the surface of the ceramic balls receive light irradiation as much as possible. As a result, the utilization rate of the catalyst on the surface of all ceramic balls is greatly improved as a whole, and the reaction of the mixed liquid for generating 2,5-dimethoxydihydrofuran is made as complete as possible and the production quality of 2,5-dimethoxydihydrofuran is improved; 3. The transparent protrusions in the present application can reflect and refract the light to a certain extent, so that the light emitted from the stirring roller can be reflected or refracted to the surface of the adjacent ceramic ball, thereby further improving the utilization of the photocatalyst, and the setting of the transparent protrusions can reduce the space between the ceramic balls, thereby reducing the probability of the light emitted from the stirring roller passing out of the catalyst bed, that is, the light emitted from the stirring roller can be fully absorbed and utilized, greatly improving the utilization rate of the light energy of the equipment, not only further improving the reaction effect of the photocatalyst, but also reducing the loss of light energy; 4. The transparent bumps can reduce the gaps between the ceramic balls. These gaps are also the channels through which the mixed liquid flows 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 improving the production quality of 2,5-dimethoxydihydrofuran.

[0015] 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 mixed liquid from flowing 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 make the mixed liquid entering the tank body from the feed port flow into the catalyst bed relatively evenly, so that the ceramic balls in the catalyst bed can all contact with the mixed liquid, so that the photocatalysts on the surfaces of all ceramic balls can play the catalytic effect of the photocatalysts themselves, thereby further improving the utilization rate of the photocatalysts; 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, so that the subsequent catalytic reaction effect is 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 ensuring that the mixed liquid can flow into the catalyst bed normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 It is a schematic diagram of the internal structure of an embodiment of the present application; Figure 3 yes Figure 2 The enlarged schematic diagram of point A in the middle; Figure 4 It is a schematic diagram of the structure of the ceramic ball in the embodiment of the present application; Figure 5 It is a schematic diagram of the structure of the diverter screen in the embodiment of the present application; Figure 6 is a schematic structural diagram of a second driving member in an embodiment of the present application; Figure 7 yes Figure 6 The enlarged schematic diagram of point B in the middle; Figure 8 is a schematic diagram of the structure of the stirring roller in the embodiment of the present application; In the figure, 1, tank body; 11, feed port; 12, discharge port; 13, slide; 2, catalyst bed; 21, support net; 22, ceramic ball; 23, transparent protrusion; 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, diversion component; 51, diversion screen; 511, sieve hole; 512, through hole; 52, second driving member; 521, toggle rod; 522, roller; 53, toggle block; 531, wave groove. DETAILED DESCRIPTION

[0017] The following is combined with Figure 1-8 , further details of this application are given.

[0018] A photocatalytic reactor for the production of 2,5-dimethoxydihydrofuran, referring to 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.

[0019] 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. Valves are provided at the feed port 11, the discharge port 12 and the air guide port in this embodiment.

[0020] The catalyst bed layer 2 in this embodiment includes two support meshes 21. The two support meshes 21 are arranged vertically and fixedly installed on the inner peripheral wall of the tank body 1. The two support meshes 21 are coaxial with the tank body 1. A number of ceramic balls 22 are filled in the space between the two support meshes 21. The number of ceramic balls 22 fills the space between the two support meshes 21, and the diameter of each ceramic ball 22 is larger than the mesh holes on the support mesh 21, so that the ceramic balls 22 cannot pass through the mesh holes of the support mesh 21. A photocatalyst is adhered to the surface of each ceramic ball 22. The catalyst in this embodiment is TiO2. 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 immersed in the solution. Ultrasonic or vacuum is used to promote the penetration of TiO2 on the surface of the ceramic ball 22. Then, the excess solvent on the surface of the ceramic ball 22 is removed by drying. Finally, the ceramic ball 22 is calcined by calcination, and finally a catalyst layer is formed on the surface of the ceramic ball 22, thus realizing the loading of the catalyst on the surface of the ceramic ball 22. This is the prior art and will not be elaborated here.

[0021] The lighting device 3 in this embodiment includes a rotating shaft 31.

[0022] The rotating shaft 31 is coaxially and rotatably installed on the upper end surface of the tank body 1. The upper end surface of the rotating shaft 31 extends out of the tank body 1. A rotating motor 33 is also provided at the upper end of the tank body 1. The output shaft of the rotating motor 33 is coaxially and fixedly connected to the rotating shaft 31. One 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 meshes 21. A through hole 512 for the rotating shaft 31 to pass through is provided on the upper support mesh 21. The peripheral wall of the rotating shaft 31 is in sliding contact with the hole wall of the through hole 512 on the upper support mesh 21. A plurality of stirring rollers 32 are provided on the peripheral wall of the rotating shaft 31 in this embodiment. The plurality of stirring rollers 32 are evenly spaced around the axis of the rotating shaft 31. And the stirring roller 32 in this embodiment is a lamp tube, that is, the outside of the stirring roller 32 is made of high boron silicate glass, which itself has high light transmittance, low thermal expansion coefficient, excellent thermal and seismic resistance and high flexural strength. The inside of the stirring roller 32 is a lamp core, and the lamp core can emit ultraviolet light.

[0023] The circulation assembly 4 in this embodiment is installed in the tank body 1, and the circulation assembly 4 can export a number of ceramic balls 22 in the space between the two support meshes 21 from this space, and then re-import them into this space. And during the process of the circulation assembly 4 exporting and then re-importing the ceramic balls 22 in the space between the two support meshes 21, the lighting device 3 can still irradiate the exported ceramic balls 22.

[0024] When 2,5 - dimethoxydihydrofuran needs to be produced, the rotating motor 33, the lamp tube (agitating roller 32) and the circulation assembly 4 are started simultaneously. After the rotating motor 33 is started, the rotating motor 33 drives the rotating shaft 31 to rotate, thereby driving the agitating roller 32 on the rotating shaft 31 to rotate. The agitating roller 32 then begins to agitate in the pile of ceramic balls 22 between the two support meshes 21. During the agitation process, the agitating roller 32 can try to contact each ceramic ball 22 in the pile of ceramic balls 22. Also, since the agitating roller 32 in this embodiment is set as a lamp tube, the light emitted by the lamp tube can then try to irradiate on the surface of each ceramic ball 22. And while the agitating roller 32 agitates the pile of ceramic balls 22 between the two support meshes 21, the circulation assembly 4 can export the ceramic balls 22 between the two support meshes 21 one by one, and then import the exported balls one by one between the two support meshes 21. Therefore, the positions of each ceramic ball 22 between the two support meshes 21 will be disrupted and reorganized. After the positions of each ceramic ball 22 between the two support meshes 21 are disrupted and reorganized, the ceramic balls 22 located at the space dead - angle between the two support meshes 21 can also contact the agitating roller 32, so that overall, all the ceramic balls 22 can receive light. And during the process of exporting and importing the ceramic balls 22, the lighting device 3 can also irradiate the exported ceramic balls 22 with light, thus further ensuring overall that the light emitted by the lamp tube can try to irradiate on the surface of each ceramic ball 22 in the catalyst bed 2. The photocatalyst on the surface of the ceramic ball 22 starts to react after receiving the light irradiation. Therefore, when the mixed solution for generating 2,5 - dimethoxydihydrofuran is introduced into the tank body 1 from the feed port 11 at this time, the mixed solution will pass through the mesh holes of the support mesh 21 and enter the gaps between several ceramic balls 22. The mixed solution will contact the photocatalyst on the surface of the ceramic balls 22, and the photocatalyst will start to catalyze the chemical reaction of the mixed solution under the action of light, thereby generating a 2,5 - dimethoxydihydrofuran solution. The generated 2,5 - dimethoxydihydrofuran solution will continue to flow along the gaps between several ceramic balls 22, then pass through the mesh holes of the lower - end support mesh 21, and finally fall to the bottom of the tank body 1.

[0025] In the above process, the stirring roller 32 can stir the stack of ceramic balls 22 between the two support meshes 21, so that the stirring roller 32 can contact as many ceramic balls 22 between the two support meshes 21 as possible, so that each ceramic ball 22 between the two support meshes 21 can receive the light emitted from the lamp tube (stirring roller 32). At the same time, the circulation component 4 shuffles the positions of all the ceramic balls 22 between the two support meshes 21. Therefore, the circulation component 4 can rearrange the ceramic balls 22 at the dead corners in the space between the two support meshes 21 (i.e., the ceramics that the stirring roller 32 cannot contact) to positions where they can contact the stirring roller 32, thus further ensuring that all the ceramic balls 22 between the two support meshes 21 can contact the stirring roller 32 as a whole, that is, can receive the light emitted from the lamp tube. In the prior art, the lighting device is directly arranged on the inner wall of the tank body 1 or inside the stack of ceramic balls 22. Since the stacking of the ceramic balls 22 between the two support meshes 21 will cause some ceramic balls 22 to be blocked, resulting in the fact that these parts of the ceramic balls 22 cannot receive the light emitted by the lighting device. Therefore, the equipment in the present application can enable all the ceramic balls 22 between the two support meshes 21 to receive light compared with the prior art, thus greatly improving the utilization efficiency of the photocatalyst on the surface of all the ceramic balls 22 in the equipment of the present application, and further making the reaction of the mixed solution generating 2,5-dimethoxydihydrofuran as complete as possible, and improving the production quality of 2,5-dimethoxydihydrofuran.

[0026] Referring to 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 arranged in a square ring shape with a notch on one side, and the ball guide tube 41 in this embodiment is arranged to be transparent. The ball guide tube 41 is arranged vertically, and the ball guide tube 41 penetrates the catalyst bed 2, that is, penetrates the upper support mesh 21 and the lower support mesh 21. The upper end of the notch on the ball guide tube 41 is inserted into the space between the two support meshes 21 from the upper support mesh 21, and the lower end of the notch on the ball guide tube 41 is inserted into the space between the two support meshes 21 from the lower support mesh 21. A top hole 411 is opened at the corner of the ball guide tube 41 near the lower notch, and the top hole 411 is arranged horizontally. A top rod 43 and a first driving member 42 are arranged on the lower end surface of the lower support mesh 21. The first driving member 42 in this embodiment includes an electric push rod. The electric push rod is fixedly installed on the lower end surface of the lower support mesh 21 horizontally. The top rod 43 is coaxially fixedly installed on the output shaft of the electric push rod. The end of the top rod 43 away from the electric push rod slides 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.

[0027] In this embodiment, the lighting device 3 further includes two lamp rings 34. One of the lamp rings 34 is fixedly installed on the lower end surface of the lower support net 21 and coaxially sleeved on the light guide tube 41, and the outer peripheral wall of the light guide tube 41 does not contact the lamp ring 34. The other lamp ring 34 is fixedly installed on the upper end surface of the upper support net 21 and also coaxially sleeved on the light guide tube 41. The light guide tube 41 in this embodiment is made of transparent glass.

[0028] When the ejector rod 43 is in the initial position, the end of the ejector rod 43 away from the electric push rod is not directly inserted into the interior of the ball guide tube 41. The end of the ejector rod 43 away from the electric push rod just blocks the top hole 411 on the ball guide tube 41. Therefore, when it is necessary to rearrange the ceramic balls 22 between the two support meshes 21, the electric push rod is started. The output shaft of the electric push rod extends in the initial state, and then the electric push rod drives the ejector rod 43 to be inserted into the interior of the ball guide tube 41. Then, the ceramic balls 22 in the ball guide tube 41 that are in contact with the ejector rod 43 will receive a thrust from the ejector rod 43 (a thrust to the left). Then, since the ceramic balls 22 are in contact with each other in sequence, the ejector rod 43 can push all the ceramic balls 22 on the left side of the ejector rod 43 in the ball guide tube 41 to move along the upper part of the ball guide tube 41. The ceramic balls 22 at the connection between the ball guide tube 41 and the upper support mesh 21 are squeezed into the interior of the two support meshes 21 under the action of the thrust of the ejector rod 43. After the end of the ejector rod 43 inserted into the interior of the ball guide tube 41 reaches a certain distance, the electric push rod immediately contracts rapidly, driving the ejector rod 43 to return to the initial position. And because the contraction speed of the electric push rod is relatively fast, the ceramic balls 22 in the ball guide tube 41 will remain relatively stationary for a period of time due to inertia or the return flow speed is slower. At this time, the ceramic balls 22 in the two support meshes 21 will fall into the ball guide tube 41 from the connection between the lower support mesh 21 and the ball guide tube 41 under the action of gravity. And the ceramic balls 22 that fall from the two support meshes 21 into the interior of the ball guide tube 41 will contact the end of the ejector rod 43 away from the electric push rod. Then, the electric push rod is started again to make the electric push rod extend, and then the ejector rod 43 is inserted into the interior of the ball guide tube 41 again. The ceramic balls 22 at the connection between the ball guide tube 41 and the upper support mesh 21 are squeezed into the space between the two support meshes 21. The electric push rod immediately contracts to drive the ejector rod 43 back to the initial position, and the ceramic balls 22 between the two support meshes 21 will fall to the ball guide tube 41 from the connection between the lower support mesh 21 and the ball guide tube 41 again. According to the above cycle process, the ceramic balls 22 inside the two support meshes 21 fall from the connection between the lower support mesh 21 and the ball guide tube 41 to the ball guide tube 41, and then the ceramic balls 22 at the connection between the ball guide tube 41 and the upper support mesh 21 are squeezed into the space between the two support meshes 21 again. Thus, the cyclic flow of the ceramic balls 22 in the two support meshes 21 is realized as a whole, that is, the rearrangement of the positions of the ceramic balls 22 between the two support meshes 21 is realized; at the same time, whether it is the ceramic balls 22 that fall from between the two support meshes 21 into the ball guide tube 41 or the ceramic balls 22 that enter the space between the two support meshes 21 from the ball guide tube 41, the two lamp rings 34 can also irradiate light on the ceramic balls 22 in the ball guide tube 41, so that the photocatalysis on the surface of the ceramic balls 22 in the ball guide tube 41 also takes effect, in order 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.

[0029] 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. Therefore, the push rod 43 will not block the path of the ceramic balls 22 in the two support nets 21 falling into the ball guide tube 41, and because 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.

[0030] Among them, in this embodiment, a plurality of transparent bumps 23 are evenly arranged in an array on the surface of the ceramic ball 22. The highest points of each transparent bump 23 in this embodiment are 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 provided with a plurality of transparent bumps 23 can still be regarded as a sphere with a depression on its surface. The inner diameter of the ball guide tube 41 is slightly larger than the maximum diameter of the sphere with the depression. In this embodiment, the transparent bumps 23 are made of silicone rubber, and the transparent silicone has good light transmittance and elasticity. First of all, the ceramic ball 22 itself is made of ceramic material. Even if a photocatalyst is coated on its surface, the surface of the ceramic ball 22 is still relatively smooth. The transparent bumps 23 are adhered to the surface of the ceramic ball 22 by glue, and the glue selected in this embodiment is transparent UV curable glue. The stirring roller 32 in this embodiment is set as a lamp tube, and the outer surface of the lamp tube is also made of transparent glass. Therefore, the frictional force 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. By arranging the transparent bumps 23 on the surface of the ceramic ball 22, the frictional force between the ceramic ball 22 and the stirring roller 32 can be well increased. Therefore, when the stirring roller 32 stirs in the pile of ceramic balls 22, the stirring roller 32 can not only try to contact all the ceramic balls 22 between the two support nets 21, 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 frictional force between the ceramic ball 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 ball 22 to rotate. Therefore, the contact points between the stirring roller 32 and the surface of the ceramic ball 22 will also change. With the continuous stirring of the stirring roller 32, the stirring roller 32 can try to contact every part of the surface of the ceramic ball 22 it touches, so that every part of the surface of the ceramic ball 22 can receive light. At the same time, the transparent bumps 23 can also increase the frictional force between the ceramic ball 22 and the ceramic ball 22. Therefore, when the stirring roller 32 makes the ceramic ball 22 in contact with it rotate, the rotating ceramic ball 22 can also drive the ceramic ball 22 in contact with it to rotate. 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 irradiated by the light emitted by the stirring roller 32.

[0031] Therefore, generally speaking, the transparent bumps 23 on the surface of the ceramic balls 22 increase the frictional force between the stirring roller 32 and the ceramic balls 22, as well as the frictional force between the ceramic balls 22 and the ceramic balls 22. Thus, the rotation of the stirring roller 32 drives the rotation of the ceramic balls 22, and then the rotation of the rotating ceramic balls 22 drives the rotation of the adjacent ceramic balls 22, so as to drive the rotation of all the ceramic balls 22 between the two support nets 21 as much as possible. Therefore, the positions of all the ceramic balls 22 between the two support nets 21 where the surfaces are in contact with or facing the stirring roller 32 are constantly changing. 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, so that the ceramic balls 22 in the dead corners between the two support nets 21 can also contact the stirring roller 32 or be irradiated by the light emitted by the stirring roller 32. Therefore, under the agitation and rotation of the stirring roller 32 on the ceramic balls 22 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 irradiated by the light emitted by the stirring roller 32, and every part of the surface of the ceramic balls 22 can be irradiated by the light emitted by the stirring roller 32. Thus, the utilization rate of the photocatalyst on the surface of the ceramic balls 22 in this embodiment is greatly improved, and further, the catalytic effect of the photocatalyst on the mixed liquid in this embodiment is greatly improved, as well as the production quality of 2,5-dimethoxydihydrofuran is improved.

[0032] As known from the foregoing, the channels through which the mixed liquid flows in the catalyst bed 2 in this embodiment are the gaps between the ceramic balls 22, and transparent bumps 23 are provided on the surface of each ceramic ball 22 in this embodiment. Therefore, when a plurality of ceramic balls 22 are stacked between the two support nets 21, the transparent bumps 23 on the ceramic balls 22 will extend into the gaps between the ceramic balls 22. Therefore, when the mixed liquid flows through the gaps between the ceramic balls 22, the transparent bumps 23 on the ceramic balls 22 can have a certain blocking effect on the mixed liquid, thereby slowing down the flow rate of the mixed liquid through the gaps between the ceramic balls 22. And the setting of the transparent bumps 23 makes the channels through which the mixed liquid flows become more curved and complex, thereby increasing the time for the mixed liquid to flow through the gaps between the ceramic balls 22. Further, overall, the contact time between the mixed liquid and the surface of the ceramic balls 22 is longer, that is, the contact time between the mixed liquid and the photocatalyst on the surface of the ceramic balls 22 is increased. Therefore, the catalytic effect of the photocatalyst on the surface of the ceramic balls 22 on the mixed liquid is greatly improved, and the reaction effect of the mixed liquid is further improved, as well as the production quality of 2,5-dimethoxydihydrofuran is improved.

[0033] Similarly, as known from the foregoing, in this embodiment, the transparent bumps 23 are provided such that when the stirring roller 32 is stirring, it can drive a number of ceramic balls 22 between the two support meshes 21 to rotate. At the same time, when the number of ceramic balls 22 is rotating, the transparent bumps 23 on the ceramic balls 22 will also move in space. And since the transparent bumps 23 are part of the flow channel through which the mixed liquid flows, during the movement of the transparent bumps 23, the flow channel of the mixed liquid will be in a constantly changing state. The bending and dynamic deformation of the channel will force the mixed liquid to continuously change direction, and the actual flow path is significantly longer than the straight-line distance, directly increasing the time for the mixed liquid to pass through. And when the channel shape changes rapidly, the inertia of the mixed liquid will conflict with the movement of the transparent bumps 23, easily inducing turbulence or separation vortices in the mixed liquid. The generation of turbulence or separation vortices can greatly consume the kinetic energy of the mixed liquid, that is, reduce the flow velocity of the mixed liquid. Therefore, when the stirring roller 32 is stirring, it can cause the flow path of the mixed liquid to change at all times, thereby further reducing the flow velocity of the mixed liquid and increasing the flow time of the mixed liquid, and further increasing the contact time between the mixed liquid and the photocatalyst on the surface of the ceramic balls 22 and improving the catalytic effect of the photocatalyst on the surface of the ceramic balls 22 on the mixed liquid.

[0034] Secondly, since the transparent bumps 23 in this embodiment are made of transparent silica gel, and the transparent silica gel can reflect and refract light to a certain extent. Therefore, when the light emitted by the stirring roller 32 reaches the transparent bumps 23, the transparent bumps 23 can reflect or refract the light emitted from the stirring roller 32 to the surface of the adjacent ceramic balls 22, thereby further improving the utilization degree of the photocatalyst. And the setting of the transparent bumps 23 can reduce the space of the gap between the ceramic balls 22 and increase the bending degree 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 balls 22 or reflected or refracted by the bumps on the surface of the ceramic balls 22 to the surface of other ceramic balls 22 and then absorbed. It reduces the probability that the light emitted from the stirring roller 32 escapes from the catalyst bed 2, that is, enables the light emitted from the stirring roller 32 to be fully absorbed and utilized, greatly improving the utilization rate of light energy by the device, not only further improving the reaction effect of the photocatalyst, but also reducing the light energy loss.

[0035] In addition, referring to Figure 2 and Figure 8, in this embodiment, 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. Moreover, in this embodiment, each stirring roller 32 is successively sleeved with a "bow" - shaped stirring roller 32 with a larger volume in the direction away from the rotating shaft 31, and each successively sleeved stirring roller 32 in the direction away from the rotating shaft 31 is also arranged in the same way. Such a design can enable the stirring roller 32 to cover a larger range in the horizontal and vertical spaces. Therefore, when the stirring roller 32 stirs the ceramic ball pile 22, the light emitted by the stirring roller 32 can cover a wider range, so as to further ensure as much as possible that each ceramic ball 22 in the ceramic ball pile 22 can receive light, and thus further improve the reaction effect of the photocatalyst.

[0036] Refer to Figure 2 , Figure 5 , Figure 6 and Figure 7In this embodiment, a flow dividing assembly 5 is further provided on the inner wall of the tank body 1. The flow dividing assembly 5 in this embodiment includes a flow dividing screen 51. The flow dividing 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 flow dividing screen 51. The flow dividing screen 51 is coaxially mounted on the inner wall of the tank body 1, and the flow dividing 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 flow dividing screen 51, and then fall from the sieve holes 511 on the flow dividing screen 51 into the upper support net 21. The mixed liquid flows through the mesh of the upper support mesh 21, then flows into the ceramic balls 22 between the two support meshes 21, and then flows to the lower support mesh 21 from the gap between the ceramic balls 22 and the ceramic balls 22. 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 the mixed liquid, greatly reducing the falling speed of the mixed liquid from top to bottom, thereby avoiding the mixed liquid speed from the lower end to the lower end. 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 also may 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 part of 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 as much as possible, 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.

[0037] At the same time, a second driving member 52 is also provided in this embodiment. 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 against 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, and 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.

[0038] Before pouring the mixed liquid from 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, 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 in a continuous undulating shape, 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 groove wall of the wave groove 531 continues to change, the diverter screen 51 can be driven to shake up and down in the slide 13. On the one hand, the shaking of the diverter screen 51 can make the mixed liquid mix more evenly, so that the subsequent catalytic reaction effect is better. On the other hand, the shaking diverter screen 51 can also avoid the situation where the debris in the mixed liquid blocks the screen hole 511 of the diverter screen 51, so as to ensure that the mixed liquid can flow into the catalyst bed 2 normally.

[0039] Finally, it should be noted that the rotating motor 33 and electric push rod and other equipment in this embodiment are all controlled and driven by the control center, and are specifically controlled by a system such as a PLC.

[0040] In this embodiment, the implementation principle of the photocatalytic reactor for the production of 2,5-dimethoxydihydrofuran is as follows: When 2,5-dimethoxydihydrofuran needs to be produced, the rotation motor 33, the lamp tube (stirring roller 32), the lamp ring 34 and the electric push rod are started. The rotation motor 33 rotates to drive the rotation shaft 31 to rotate. The rotation motor 33 drives the rotation shaft 31 to rotate, thereby driving the stirring roller 32 on the rotation shaft 31 to rotate. The stirring roller 32 then starts to stir in the pile of ceramic balls 22 between the two support nets 21. During the stirring process, the stirring roller 32 can try to contact each ceramic ball 22 in the pile of ceramic balls 22. Also, since the stirring roller 32 in this embodiment is set as a lamp tube, the light emitted by the lamp tube can then be irradiated on the surface of each ceramic ball 22 as much as possible. And due to the setting of the transparent bump 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 support nets 21 to rotate, so that other parts of the surface of the ceramic balls 22 can also receive the light from the stirring roller 32.

[0041] At the same time, the telescopic movement of the electric push rod drives the ejector rod 43 to slide into and out of the guide ball tube 41, thereby pushing the ceramic balls 22 that fall from the lower support net 21 into the guide ball tube 41 in the upward direction of the guide ball tube 41. The ceramic balls 22 at the connection between the guide ball tube 41 and the upper support net 21 then re-enter between the two support nets 21, thus realizing the circulating flow of the ceramic balls 22 in the two support nets 21, making the positions of the ceramic balls 22 in the two support nets 21 change, so that each ceramic ball 22 can receive the stirring light, and the lamp ring 34 can also irradiate the ceramic balls 22 in the guide ball tube 41. After all the ceramic balls 22 have received a certain amount of light, the mixed liquid is poured from the feed port 11 of the tank body 1. The mixed liquid will first fall into the shunt sieve 51. When the rotation motor 33 drives the rotation shaft 31 to rotate, the rotation shaft 31 will drive the dial rod 521 to rotate around the axis of the rotation shaft 31. The roller 522 at the upper end of the dial rod 521 is always in contact with the groove wall of the wave groove 531 on the shunt sieve 51. And since the groove wall of the wave groove 531 is continuously undulating, the dial rod 521 drives the shunt sieve 51 to vibrate up and down in the sliding groove 13. Then the mixed liquid falls from the sieve holes 511 on the shunt sieve 51 onto the upper support net 21, and then flows through the mesh holes of the upper support net 21 into the pile of ceramic balls 22 between the two support nets 21, and then flows through the gaps 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 part of the tank body 1. When it is necessary to collect or transport the produced dimethoxydihydrofuran, the discharge port 12 is opened, and other equipment can be used to transport or fill the produced dimethoxydihydrofuran.

[0042] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. The same components are denoted by the same reference numerals. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope 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 inlet (11) is provided at the top of the tank body (1), and a discharge outlet (12) is provided at the bottom of the tank body (1); The catalyst bed (2) comprises two support nets (21), the two support nets (21) are arranged in a vertical direction and installed on the inner wall of the tank (1), a plurality of ceramic balls (22) are filled between the two support nets (21), and each of the ceramic balls (22) is adhered with a photocatalyst; The lighting device (3) comprises 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 two supporting nets (21), a plurality of stirring rollers (32) being arranged on the outer wall of the rotating shaft (31) between the two supporting nets (21), each stirring roller (32) being a lamp tube; The circulation component (4) is used to guide a plurality of ceramic balls (22) out of the catalyst bed (2) 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 then reintroducing them, the illumination device (3) can also illuminate the guided ceramic balls (22).

2. The photocatalytic reactor for the production of 2,5-dimethoxydihydrofuran according to claim 1, characterized in that, 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.

3. The photocatalytic reactor for the production of 2,5-dimethoxydihydrofuran according to claim 2, wherein A plurality of transparent bumps (23) are arranged on the surface of each ceramic ball (22); each transparent bump (23) is made of an elastic material, and the transparent bump (23) is capable of refracting and reflecting light.

4. A photocatalytic reactor for the production of 2,5-dimethoxydihydrofuran according to claim 2, characterized in that, The circulation assembly (4) comprises a ball guide tube (41), the ball guide tube (41) being arranged along the vertical direction to penetrate the entire catalyst bed (2), the upper end of the ball guide tube (41) being arranged in a curved manner and inserted into the catalyst bed from the upper end of the catalyst bed (2), the lower end of the ball guide tube (41) being arranged in a curved manner and inserted into the catalyst bed from the lower end of the catalyst bed (2), the lower end of the ball guide tube (41) being arranged in a curved manner and inserted into the catalyst bed from the lower end of the catalyst bed (2), a top hole (411) being provided at the curved portion of the lower end of the ball guide tube (41), and the lower end surface A push rod (43) is slidably arranged 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 arranged on the lower 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).

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

6. A photocatalytic reactor for the production of 2,5-dimethoxydihydrofuran according to claim 5, characterized in that, A chute (13) is formed in the inner wall of the tank body (1) in the vertical direction. The flow splitting sieve (51) is located in the chute (13), and the peripheral wall of the flow splitting sieve (51) is in sliding abutment with the chute wall of the chute (13). The hole wall of the through hole (512) is in sliding abutment with the peripheral wall of the rotation shaft (31). A second driving member (52) for driving the flow splitting sieve (51) to slide up and down reciprocally is further provided on the rotation shaft (31).

7. A photocatalytic reactor for the production of 2,5-dimethoxydihydrofuran according to claim 6, characterized in that, The second driving member (52) includes a toggle rod (521) and a dial block (53). The toggle rod (521) is fixedly installed on the outer peripheral wall of the rotation shaft (31) in the vertical direction. The dial block (53) is coaxially fixedly installed on the lower end face of the flow splitting sieve (51) and is coaxially sleeved on the rotation shaft (31). A wave groove (531) is formed on the lower end face of the dial block (53). A roller (522) is provided at the highest point of the toggle rod (521). The roller (522) is in sliding and rotating abutment with the groove wall of the wave groove (531).

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