Feeding device and feeding method
By designing a feeding device with diffusion pores, the mixing degree between propylene and hydrogen peroxide is improved by using pressure difference and violent collision, the problem of poor reaction effect in the HPPO method is solved, and a more efficient reaction efficiency is achieved.
Patent Information
- Application Number
- CN202311070675.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-08-24
- Publication Date
- 2025-02-25
AI Technical Summary
The use of a static mixer in the HPPO method results in a small interface area between propylene and methanol, poor mixing effect, and thus low conversion of propylene oxide.
Design a feeding device, including a venturi pipe and a feed cylinder, and a diffusion hole is provided on the periphery of the diffusion section of the venturi pipe, through the pressure difference, the first material enters the diffusion section through the diffusion hole, and a violent collision with the second material , improve the mixing degree.
By increasing the contact area and mixing degree between the first material and the second material, the conversion rate of propylene oxide is improved and the reaction efficiency is improved.
Smart Images
Figure CN119499971A_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of fine chemicals, and specifically relates to a feeding device and a feeding method. Background Art
[0002] Propylene oxide (PO) is an important propylene derivative. It is usually produced by the HPPO method (hydrogen peroxide direct oxidation method). The HPPO method uses propylene and hydrogen peroxide as raw materials and directly oxidizes them to produce propylene oxide under the catalysis of titanium silicalite catalyst.
[0003] The HPPO method requires methanol as a solvent medium, and liquid propylene reacts with hydrogen peroxide in methanol. The HPPO method usually uses a static mixer to generate propylene oxide. Propylene and methanol are first mixed, and then mixed with hydrogen peroxide before being sent to the reactor. When using a static mixer, the interface area between propylene and methanol is small, and the mixing effect is poor. The poor reaction effect of the HPPO method leads to a low propylene oxide conversion rate. Summary of the invention
[0004] In order to solve the technical problem in the related art that the reaction effect of the HPPO method is poor and leads to a low conversion rate of propylene oxide, the present application provides a feeding device and a feeding method.
[0005] A first aspect of the present application provides a feeding device, the feeding device comprising:
[0006] A venturi tube is arranged vertically, and a diffusion hole is arranged on the peripheral surface of the diffusion section of the venturi tube;
[0007] The feed cylinder at least comprises a first cylinder covering the outer side of the venturi tube, wherein the first cylinder and the venturi tube form a first feed cavity, and a feed hole is arranged on the peripheral surface of the first cylinder.
[0008] In some embodiments, the feeding device further comprises:
[0009] A feed pipe, wherein the feed port of the feed pipe is located outside the venturi tube, and the discharge port of the feed pipe extends to the inlet section of the venturi tube.
[0010] In some embodiments, the outlet of the feed pipe passes through the inlet section of the venturi tube and extends to the throat of the venturi tube, and the outlet of the feed pipe faces the diffuser section.
[0011] In some embodiments, the feeding device further comprises:
[0012] a nozzle, the nozzle being connected to the discharge port of the feed pipe, and the outlet of the nozzle being oriented toward the diffusion section; or
[0013] The diameter of the feed pipe gradually decreases as it approaches the discharge port.
[0014] In some embodiments, a plurality of diffusion holes are provided and are evenly distributed on the circumference of the diffusion section.
[0015] In some embodiments, the feeding device comprises:
[0016] An extension tube, the inlet of which is in communication with the diffuser section;
[0017] A corrugated plate is arranged in the extension tube, and the plane where the corrugated plate is located is perpendicular to the axis of the extension tube.
[0018] In some embodiments, the corrugated plates are provided in multiple groups and are stacked along the axial direction of the extension tube.
[0019] In some embodiments, the feeding device further comprises:
[0020] A distribution plate, the distribution plate is located in the extension tube and on the side of the corrugated plate away from the diffusion section, the plane where the distribution plate is located is perpendicular to the axis of the extension tube, and a liquid outlet is provided on the distribution plate;
[0021] A plurality of groups of ridge-shaped baffles are provided, wherein the ridge-shaped baffles are located on the side of the distribution plate away from the corrugated plate, the openings of the ridge-shaped baffles cover the liquid outlet in a direction perpendicular to the axis of the extension tube, and the spines of two adjacent ridge-shaped baffles are arranged at an angle.
[0022] In some embodiments, the feeding device further comprises:
[0023] A guide tube, one end of which is connected to the liquid outlet, and the other end of which extends toward the spine of the ridge-shaped baffle.
[0024] The second aspect of the present application provides a feeding method, which is implemented by using the above-mentioned feeding device, and the feeding method comprises:
[0025] continuously feeding a first material into an inlet section of the venturi tube, wherein the first material is formaldehyde;
[0026] Continuously feeding the second material into the feed pipe, so that the second material is transported from the outlet of the feed pipe to the roar of the venturi tube and mixed with the second material to form a first mixed material, wherein the second material is hydrogen peroxide;
[0027] The third material is continuously fed into the first feed cavity, so that the third material is mixed with the first mixed material through the diffusion hole to form a second mixed material, and the second mixed material is transported to the outlet of the extension tube through the corrugated plate, the distribution plate and the ridge baffle. The third material is propylene.
[0028] According to the feeding device and feeding method provided by one or more embodiments of the present application, the feeding device at least includes a venturi tube and a feeding cylinder, which are arranged vertically, and the circumference of the diffusion section of the venturi tube is provided with a diffusion hole; the feeding cylinder at least has a first cylinder covering the outside of the venturi tube, and the first cylinder and the venturi tube are configured to form a first feeding cavity, and the circumference of the first cylinder is provided with a feeding hole. The first material can be fed into the first feeding cavity through the feeding hole, and the second material can enter the diffusion section through the throat of the venturi tube. As the diameter of the throat of the Venturi tube shrinks, the flow rate of the second material increases; at the same time, the diameter of the diffusion section gradually increases along the axis away from the throat, and the second material entering the diffusion section suddenly expands, reducing the pressure in the diffusion section. Then, the first material enters the diffusion section through the diffusion hole under the action of the pressure difference and collides violently with the second material, which can disperse the first material and the second material into particles with smaller diameters, increase the contact area between the first material and the second material, improve the mixing degree of the first material and the second material, and improve the conversion rate of the reaction products of the first material and the second material. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] Figure 1 It is a schematic diagram of the structure of a feeding device in one or more embodiments of the present application;
[0030] Figure 2 A schematic diagram of the structure of the distribution plate and the ridge-shaped baffle in one or more embodiments of the present application;
[0031] Figure 3 It is a schematic diagram of the arrangement between two adjacent ridge-shaped baffles in one or more embodiments of the present application.
[0032] Description of reference numerals:
[0033] 10. Venturi tube; 11. Inlet section; 12. Throat; 13. Diffusion section; 131. Diffusion hole;
[0034] 20. Feeding cylinder; 21. First cylinder; 211. Feeding hole; 22. First feeding cavity; 23. Second cylinder; 24. Bottom support; 241. Feeding hole; 25. Second feeding cavity;
[0035] 30. Feed pipe; 31. Feed port; 32. Discharge port;
[0036] 40. nozzle; 50. extension tube; 60. corrugated plate; 70. distribution plate; 71. liquid outlet;
[0037] 80. Ridge-shaped baffle; 90. Guide pipe. DETAILED DESCRIPTION
[0038] In order to make the technical personnel in the technical field to which the present application belongs to understand the present application more clearly, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.
[0039] Propylene oxide (PO) is an important propylene derivative, mainly used in the production of polyether polyols, propylene glycol, propylene glycol ether, isopropanolamine and propylene carbonate. It is one of the main raw materials for the manufacture of polyurethane, non-ionic surfactants, emulsifiers, oilfield demulsifiers, flame retardants, plasticizers and lubricants, and is widely used in the petroleum, chemical, pesticide, textile and daily chemical industries.
[0040] In recent years, green environmental protection has become the theme advocated in production and life. HPPO method (hydrogen peroxide direct oxidation method) is usually used to produce propylene oxide. The HPPO method uses propylene and hydrogen peroxide as raw materials, and directly oxidizes to produce propylene oxide under the catalysis of titanium silicon molecular sieve catalyst. The process is simple, the reaction conditions are mild, there is no harmful gas emission in the entire production process, and the wastewater generated can meet the discharge standards after general treatment. Its green environmental protection and low production cost advantages have made it one of the fastest-growing and most promising processes.
[0041] The HPPO method requires methanol as a solvent medium, and liquid propylene reacts with hydrogen peroxide in methanol. The HPPO method usually uses a static mixer to generate propylene oxide. Propylene is first mixed with methanol, then mixed with hydrogen peroxide, and then sent to the reactor. When using a static mixer, the interface area between propylene and methanol is small, and the mixing effect is poor; at the same time, the pipeline distance between the mixer and the reactor is long, propylene dissociates during transportation, and the interface area between propylene and methanol is small. The poor reaction effect of the HPPO method leads to a low propylene oxide conversion rate.
[0042] In order to solve the technical problem that the HPPO method has poor reaction effect and leads to low conversion rate of propylene oxide, the first aspect of the present application provides a feeding device, see Figure 1The feeding device at least includes a venturi tube 10 and a feeding barrel 20. The venturi tube 10 at least includes an inlet section 11, a throat 12 and a diffuser section 13. The venturi tube 10 is arranged in a vertical direction. In the vertical upward direction, the venturi tube 10 includes the inlet section 11, the throat 12 and the diffuser section 13 in sequence. The outlet of the diffuser section 13 is connected to the inlet of the reactor barrel, so that the material in the feeding device can be transported to the reactor to participate in the reaction.
[0043] See also Figure 1 The feed cylinder 20 at least has a first cylinder 21 covering the outside of the venturi tube 10, the diameter of the inlet of the inlet section 11 of the venturi tube 10 is the same as the diameter of the outlet of the diffusion section 13, and are respectively equal to the inner diameter of the first cylinder 21, then the venturi tube 10 can be sleeved in the first cylinder 21 along the axial direction of the first cylinder 21, and the inlet of the inlet section 11 of the venturi tube 10 can be fixedly connected to the inner side wall of the first cylinder 21, and the outlet of the diffusion section 13 can be fixedly connected to the inner side wall of the first cylinder 21; in this way, the first cylinder 21 can form a first feed chamber 22 with the outer side of the venturi tube 10, and the first feed chamber 22 can provide a storage space for materials to ensure that the materials can be supplied continuously and stably.
[0044] A feed hole 211 is provided on the circumference of the first cylinder 21, and a diffuser hole 131 is provided on the circumference of the diffuser section 13 of the venturi tube 10. The aperture of the diffuser hole 131 is usually set to 2 mm to 3 mm, which can meet the requirements of the first material passing through and increase the speed of the first material being ejected from the diffuser hole 131. The first material can enter the first feed cavity 22 through the feed hole 211, and the first material entering the first feed cavity 22 can enter the diffuser section 13 of the venturi tube 10 through the diffuser hole 131.
[0045] It should be noted that the aperture of the diffusion hole can be set according to actual needs and is not limited in this application.
[0046] During the feeding process of the feeding device, the second material can enter the venturi tube 10 through the inlet section 11 of the venturi tube 10. As the second material continues to be filled into the inlet section 11 of the venturi tube 10, the second material will enter the diffuser section 13 through the throat 12 of the venturi tube 10. As the diameter of the venturi tube 10 shrinks from the inlet section 11 to the throat 12, the flow rate of the second material increases; at the same time, the diffuser section 13 of the venturi tube 10 moves away from the throat 12 along the axis, and the diameter of the venturi tube 10 gradually increases, so the second material entering the diffuser section 13 at a high speed suddenly expands, and the pressure in the diffuser section 13 of the venturi tube 10 decreases. As a result, the pressure in the diffusion section 13 of the venturi tube 10 will be lower than the pressure in the first feed chamber 22. Under the action of the pressure difference, the first material enters the diffusion section 13 at a high speed through the diffusion hole 131 in a direction perpendicular to the inner wall of the diffusion section 13. At this time, the second material collides violently with the first material sucked into the diffusion section 13 through the diffusion hole 131.
[0047] Since the first material and the second material collide violently in the diffusion section 13, the first material and the second material can be dispersed into particles with smaller diameters during the violent collision, so that the droplets of the first material and the second material can be micro-interfaced, which greatly increases the interfacial area of the first material and the second material, increases the contact area between the first material and the second material, strengthens the mass transfer efficiency between the first material and the second material, and improves the mixing degree of the first material and the second material; in this way, when the mixed liquid of the first material and the second material is transported to the reactor and contacts the catalyst in the reactor, the first material and the second material can be fully reacted under the catalytic action of the catalyst.
[0048] In the embodiment of the present application, propylene oxide is manufactured by the HPPO method. Taking the feeding device feeding to the reactor for generating propylene oxide as an example, the first material can be propylene, and the second material can be a mixture of methanol and hydrogen peroxide. During the feeding process, the mixture of methanol and hydrogen peroxide can enter the venturi tube 10 through the inlet section 11 of the venturi tube 10. As the mixture of methanol and hydrogen peroxide continues to be filled into the inlet section 11 of the venturi tube 10, the mixture of methanol and hydrogen peroxide will be transported to the diffusion section 13 through the throat 12 of the venturi tube 10. Since the diameter of the venturi tube 10 shrinks from the inlet section 11 to the throat 12 of the venturi tube 10, the flow rate of the mixture of methanol and hydrogen peroxide increases; at the same time, the diffusion section 13 of the venturi tube 10 moves away from the throat direction along the axial direction, and the diameter of the venturi tube 10 gradually increases. The mixture of methanol and hydrogen peroxide entering the diffusion section 13 at a high speed suddenly expands, and the pressure in the diffusion section 13 of the venturi tube 10 decreases. As a result, the pressure in the diffusion section 13 of the venturi tube 10 will be lower than the pressure in the first feed chamber 22. When propylene enters the first feed chamber 22, propylene, under the action of the pressure difference, enters the diffusion section 13 at a high speed through the diffusion hole 131 in a direction perpendicular to the inner wall of the diffusion section 13. At this time, the mixture of methanol and hydrogen peroxide collides violently with the propylene sucked into the diffusion section 13 through the diffusion hole 131.
[0049] Since the mixed liquid of propylene, methanol and hydrogen peroxide violently collides in the diffusion section 13, the mixed liquid of propylene, methanol and hydrogen peroxide can be dispersed into particles with smaller diameters during the violent collision, so that the droplets of the mixed liquid of propylene, methanol and hydrogen peroxide can be micro-interfaced, which greatly increases the interfacial area of the mixed liquid of propylene, methanol and hydrogen peroxide, increases the contact area between the mixed liquid of propylene, methanol and hydrogen peroxide, strengthens the mass transfer efficiency between the mixed liquid of propylene, methanol and hydrogen peroxide, and improves the mixing degree of the mixed liquid of propylene, methanol and hydrogen peroxide; thus, when the mixed liquid of propylene, methanol and hydrogen peroxide is transported to the reactor, it contacts the catalyst in the reactor, so that the mixed liquid of propylene, methanol and hydrogen peroxide can fully react under the catalytic action of the catalyst, thereby improving the conversion rate of propylene oxide.
[0050] Furthermore, the feeding device also includes a second cylinder 23 and a bottom support 24. The axis of the second cylinder 23 can be colinear with the axis of the first cylinder 21, and the inner diameter of the first cylinder 21 is equal to the inner diameter of the second cylinder 23. The second cylinder 23 can be connected to the inlet position of the first cylinder 21 close to the inlet section 11 of the venturi tube 10, and the bottom support 24 is fixedly connected to the end of the second cylinder 23 away from the first cylinder 21, so that the inlet section 11 of the venturi tube 10, the second cylinder 23 and the bottom support 24 are surrounded to form a second feeding chamber 25; the bottom support 24 is provided with a feeding hole 241, and the feeding hole 241 is connected to the second feeding chamber 25. The second cylinder 23 increases the volume of the second feeding chamber 25 to a certain extent, and can increase the storage amount of the mixed liquid of methanol and hydrogen peroxide in the second feeding chamber 25. The mixed liquid of methanol and hydrogen peroxide can be delivered to the second feed chamber 25 through the delivery hole 241 , thereby improving the convenience of delivering the mixed liquid of methanol and hydrogen peroxide to the second feed chamber 25 .
[0051] The HPPO method requires methanol as a solvent medium, and hydrogen peroxide is mixed in methanol. Further, propylene is fed into the mixture of hydrogen peroxide and methanol. In order to improve the mass transfer efficiency of the mixture of propylene, hydrogen peroxide and methanol, methanol and hydrogen peroxide need to be fully mixed. Specifically, the feeding device also includes a feeding pipe 30, a feeding port 31 of the feeding pipe 30 is located outside the venturi tube 10, and a discharge port 32 of the feeding pipe 30 extends to the inlet section 11 of the venturi tube 10. Methanol is fed into the second feeding chamber 25 through the feeding hole 241, and hydrogen peroxide is fed into the inlet section 11 of the venturi tube 10 through the feeding pipe 30, so that hydrogen peroxide can be dissolved in methanol and mixed with methanol to obtain a mixture of hydrogen peroxide and methanol.
[0052] In order to increase the mixing speed of methanol and hydrogen peroxide, the discharge port 32 of the feed pipe 30 passes through the inlet section 11 of the venturi tube 10 and extends to the throat 12 of the venturi tube 10, and the discharge port 32 faces the diffusion section 13. Methanol enters the second feed cavity 25 from the feed hole 241 on the bottom support 24, and formaldehyde enters the diffusion section 13 of the venturi tube 10 from the second feed cavity 25 through the throat 12. Since the diameter of the inlet section 11 along the axial direction of the venturi tube 10 is smaller than the diameter of the throat 12, the flow rate of formaldehyde increases when it enters the throat 12 from the inlet section 11; at this time, hydrogen peroxide is transported to the throat 12 from the discharge port 32 of the feed pipe 30, and is quickly mixed with the highly fluid formaldehyde, and quickly flows out of the throat 12, and the mixed liquid of formaldehyde and hydrogen peroxide is transported to the diffusion section 13.
[0053] In order to improve the mixing degree of formaldehyde and hydrogen peroxide, the feeding device further includes a nozzle 40, which is connected to the discharge port 32 of the feeding pipe 30, and the outlet of the nozzle 40 faces the diffusion section 13. The nozzle 40 can granulate the hydrogen peroxide and increase the output speed of the hydrogen peroxide. Since the nozzle 40 increases the granulation of the hydrogen peroxide, the contact area between the hydrogen peroxide and the formaldehyde can be increased, and the mixing degree of the formaldehyde and the hydrogen peroxide can be improved; since the flow speed of the formaldehyde increases when the formaldehyde enters the throat 12 from the inlet section 11, and the speed of the hydrogen peroxide output through the nozzle 40 is also faster, the mixing speed of the formaldehyde and the hydrogen peroxide can be further improved.
[0054] In some embodiments, in order to increase the output speed of the hydrogen peroxide output through the nozzle 40, the diameter of the feed pipe 30 gradually decreases along the direction close to the outlet 32. Since the diameter of the feed pipe 30 decreases near the outlet 32, the speed of the hydrogen peroxide passing through the outlet of the feed pipe 30 increases, and the speed of the hydrogen peroxide output through the nozzle 40 is also faster, so the mixing speed of formaldehyde and hydrogen peroxide can be further increased.
[0055] In order to further improve the mixing degree between the mixed liquid of methanol and hydrogen peroxide and propylene, a plurality of diffusion holes 131 may be provided and evenly distributed on the circumference of the diffusion section 13 . Then, under the action of the pressure difference, propylene can enter the diffusion section 13 from the multiple diffusion holes 131 evenly distributed on the circumference of the diffusion section 13. On the one hand, the amount of propylene entering the diffusion section 13 can be increased. On the other hand, since propylene enters the diffusion section 13 from the multiple diffusion holes 131 dispersed on the circumference of the diffusion section 13, the contact area with the mixture of methanol and hydrogen peroxide can be increased. At the same time, the mixture of methanol and hydrogen peroxide and the propylene absorbed into the diffusion section 13 through the diffusion holes 131 collide violently for many times, and the micro-interface of the droplets of propylene and the mixture of methanol and hydrogen peroxide can be further improved, thereby greatly increasing the interfacial area between propylene and the mixture of methanol and hydrogen peroxide, increasing the contact area between propylene and the mixture of methanol and hydrogen peroxide, strengthening the mass transfer efficiency between propylene and the mixture of methanol and hydrogen peroxide, and improving the mixing degree of propylene with the mixture of methanol and hydrogen peroxide.
[0056] For further information, see Figure 1The feeding device also includes an extension tube 50 and a corrugated plate 60. The inlet of the extension tube 50 is connected to the diffusion section 13, and the outlet of the extension tube 50 is connected to the inlet of the reactor cylinder; and the axis of the extension tube 50 is colinear with the axis of the diffusion section 13. The extension tube 50 can increase the outlet space of the diffusion section 13 of the venturi tube 10 to a certain extent; at the same time, the setting of the extension tube 50 can directly transport the mixed liquid of propylene, methanol and hydrogen peroxide in the feeding device to the reactor, prevent the dissociation of propylene due to the long material transportation distance, ensure the interface contact area between propylene and formaldehyde, improve the reaction effect, and improve the propylene oxide conversion rate.
[0057] The corrugated plate 60 is arranged in the extension tube 50. The extension tube 50 can provide an installation space for the corrugated plate 60, and the plane where the corrugated plate 60 is located is perpendicular to the axis of the extension tube 50. Then, the mixed liquid of propylene, methanol and hydrogen peroxide is transported upward from the diffusion section 13 of the venturi tube 10 to the corrugated plate 60. The corrugated plate 60 can further disperse the mixed liquid of propylene, methanol and hydrogen peroxide, so that the droplets of the mixed liquid of propylene, methanol and hydrogen peroxide are micro-interfaced. Usually, the mixed liquid of propylene, methanol and hydrogen peroxide can be dispersed into micro-droplets with a diameter of 100-300 microns, thereby increasing the interfacial area of the mixed liquid of propylene, methanol and hydrogen peroxide, enhancing the mass transfer efficiency of propylene, methanol and hydrogen peroxide, and improving the conversion rate of propylene oxide.
[0058] In order to further improve the dispersion degree of the mixture of propylene, methanol and hydrogen peroxide, multiple groups of corrugated plates 60 can be provided, and multiple groups of corrugated plates 60 can be stacked along the axial direction of the extension tube 50. Each time the mixture of propylene, methanol and hydrogen peroxide passes through a group of corrugated plates 60, the mixture of propylene, methanol and hydrogen peroxide is dispersed once. Therefore, multiple groups of corrugated plates 60 are stacked, which can achieve multiple dispersions of the mixture of propylene, methanol and hydrogen peroxide, and improve the dispersion degree of the mixture of propylene, methanol and hydrogen peroxide to a certain extent. Furthermore, when the mixture of propylene, methanol and hydrogen peroxide contacts and reacts with the catalyst, the contact area between the dispersed particles of the mixture of propylene, methanol and hydrogen peroxide and the catalyst can be increased, the reaction speed and reaction completeness of propylene, methanol and hydrogen peroxide can be increased, and the conversion rate of propylene oxide can be increased.
[0059] For further information, see Figures 1 to 3The feeding device also includes a distribution plate 70 and a plurality of groups of ridge-shaped baffles 80. The distribution plate 70 is located in the extension tube 50 and is located on the side of the corrugated plate 60 away from the diffusion section 13. The plane where the distribution plate 70 is located is perpendicular to the axis of the extension tube 50. The distribution plate 70 is provided with a liquid outlet 71. Then, the mixed liquid of propylene, methanol and hydrogen peroxide can be sprayed upward to the distribution plate 70 through the multi-layer corrugated plate 60, and transported to the inlet of the reactor cylinder from the liquid outlet 71 on the distribution plate 70. At the same time, a plurality of liquid outlets 71 can be provided, so that the mixed liquid of propylene, methanol and hydrogen peroxide can enter the inlet of the reactor cylinder from the plurality of liquid outlets 71, and contact and react with the catalyst in the reactor, thereby increasing the amount of the mixed liquid of propylene, methanol and hydrogen peroxide entering the inlet of the reactor cylinder. Furthermore, a plurality of liquid outlets can be evenly distributed on the distribution plate 70, so that the mixed liquid of propylene, methanol and hydrogen peroxide can contact the catalyst located in the inlet of the reactor cylinder more evenly, thereby increasing the reaction rate.
[0060] Furthermore, in order to prevent the catalyst in the inlet of the reactor barrel from flowing back into the feed device, please refer to Figures 1 to 3 The feeding device further comprises a plurality of groups of ridge-shaped baffles 80, the ridge-shaped baffles 80 are located on the side of the distribution plate 70 away from the corrugated plate 60, the opening of the ridge-shaped baffles 80 covers the liquid outlet 71 in a direction perpendicular to the axis of the extension tube 50, and the spines of two adjacent ridge-shaped baffles 80 are arranged at an angle; please refer to Figures 2 to 3 In this way, the mixture of propylene, methanol and hydrogen peroxide sprayed out through the liquid outlet 71 can also contact the side wall inside the ridge-shaped baffle 80; since the baffle blocks the mixture of propylene, methanol and hydrogen peroxide, the mixture of propylene, methanol and hydrogen peroxide can be output from both sides of the ridge-shaped baffle 80. At the same time, since the spines of two adjacent ridge-shaped baffles 80 are arranged at an angle, the mixture of propylene, methanol and hydrogen peroxide output from both sides of the ridge-shaped baffle 80 can be sprayed onto the outer side wall of the ridge-shaped baffle 80. After being reflected by the outer side wall of the ridge-shaped baffle 80, the mixture of propylene, methanol and hydrogen peroxide can be reflected into the inlet of the reactor cylinder, and contact with the catalyst in the inlet of the reactor cylinder to react.
[0061] It should be noted that, due to the setting of the ridge-shaped baffle 80, the catalyst in the inlet of the reactor cylinder can be prevented from falling into the liquid outlet 71, so the catalyst falling from the inlet of the reactor cylinder may fall onto the distribution plate 70. In order to prevent the catalyst falling onto the distribution plate 70 from rolling into the liquid outlet 71, the feeding device also includes a guide tube 90, one end of which is connected to the liquid outlet 71, and the other end extends toward the spine direction. Due to the obstruction of the outer tube wall of the guide tube 90, the catalyst falling onto the distribution plate 70 can be prevented from entering the liquid outlet 71, so the catalyst in the inlet of the reactor cylinder can be prevented from flowing back into the feeding device, thereby reducing the occurrence of back mixing to a certain extent.
[0062] In order to prevent the mixed liquid of propylene, methanol and hydrogen peroxide from being transported to the inlet of the reactor cylinder through the reflection of the outer wall of the ridge-shaped baffle 80, the mixed liquid of propylene, methanol and hydrogen peroxide is transported to the inlet of the reactor cylinder, Figures 2 to 3 The height of the guide tube 90 is usually 2 cm to 5 cm higher than the plane where the distribution plate is located. The liquid outlets 71 are arranged in a square on the distribution plate 70, so the guide tubes 90 are also arranged in a positive direction on the distribution plate 70. Figure 3 The ridge-shaped baffle 80 includes two baffles, which are arranged to rotate around the ridge, and the angle A between the ridges of the two baffles is usually set to 90 degrees. In this way, the mixed liquid of propylene, methanol and hydrogen peroxide can be sprayed out from the guide tube 90. Due to the blocking of the ridge-shaped baffle 80, the mixed liquid of propylene, methanol and hydrogen peroxide can be sprayed from the two ends of the ridge of the ridge-shaped baffle 80 to the outer ridge surface of the adjacent ridge-shaped baffle 80. After reflection from the outer ridge surface, the mixed liquid of propylene, methanol and hydrogen peroxide can be sprayed to the inlet of the reactor barrel in a direction perpendicular to the distribution plate 70. Since the liquid outlets 71 are evenly distributed on the distribution plate 70, and the angle between the ridges of the two baffles is usually set to 90 degrees, the mixed liquid of propylene, methanol and hydrogen peroxide can be sprayed more evenly into the inlet of the reactor barrel in a vertical direction, so that the mixed liquid of propylene, methanol and hydrogen peroxide can contact the catalyst more evenly, thereby improving the reaction speed.
[0063] It should be noted that the feeding device is suitable for the liquid-solid circulating slurry bed and fluidized bed reaction system of the catalyst particles in the inlet of the reactor cylinder, and the mixed liquid of propylene, methanol and hydrogen peroxide can be fully and directly contacted with the catalyst, thereby improving the utilization rate of the catalyst and the conversion rate of propylene oxide. At the same time, the feeding device is also suitable for gas-liquid feeding mixing devices such as liquid phase hydrogenation, and can be specifically set according to actual conditions, which is not limited in this application.
[0064] The second aspect of the present application provides a feeding method, which is implemented by using the above-mentioned feeding device. The feeding method comprises:
[0065] S10, continuously feeding the first material into the inlet section 11 of the venturi tube 10.
[0066] Specifically, see Figures 1 to 3 Taking the HPPO method for producing propylene oxide as an example, the first material may be formaldehyde, which is transported to the inlet section 11 of the venturi tube 10 through the feed hole 241. With the continuous input of formaldehyde, the formaldehyde is sprayed from the throat 12 into the diffusion section 13. At the same time, due to the contraction of the diameter of the throat 12 of the venturi tube 10, the flow rate of the formaldehyde increases.
[0067] S20, continuously feeding the second material into the feed pipe 30.
[0068] The second material may be hydrogen peroxide, which is transported from the outlet 32 of the feed pipe 30 to the throat 12 , where it is quickly mixed with the highly fluid formaldehyde and flows out of the throat 12 quickly, transporting the mixed liquid of formaldehyde and hydrogen peroxide to the diffusion section 13 .
[0069] S30, continuously feeding the third material into the first feeding chamber 22.
[0070] The third material may be propylene. Under the action of the large pressure difference in the diffusion section 13, the propylene in the first feed chamber 22 enters the diffusion section 13 at a high speed through the diffusion hole 131 in a direction perpendicular to the inner wall of the diffusion section 13. At this time, the mixture of methanol and hydrogen peroxide collides violently with the propylene sucked into the diffusion section 13 through the diffusion hole 131.
[0071] Since the mixed liquid of formaldehyde, methanol and hydrogen peroxide violently collides in the diffusion section 13, the mixed liquid of propylene, methanol and hydrogen peroxide can be dispersed into particles with smaller diameters during the violent collision. Then, the droplets of the mixed liquid of propylene, methanol and hydrogen peroxide can be micro-interfaced, which greatly increases the interfacial area of the mixed liquid of propylene, methanol and hydrogen peroxide, increases the contact area between the mixed liquid of propylene, methanol and hydrogen peroxide, strengthens the mass transfer efficiency between the mixed liquid of propylene, methanol and hydrogen peroxide, and improves the mixing degree of the mixed liquid of propylene, methanol and hydrogen peroxide. In this way, when the mixed liquid of propylene, methanol and hydrogen peroxide is transported to the reactor and contacts the catalyst in the reactor, the mixed liquid of propylene, methanol and hydrogen peroxide can be fully reacted under the catalytic action of the catalyst.
[0072] Furthermore, the mixture of propylene, methanol and hydrogen peroxide is transported upward from the diffusion section of the venturi tube 10 to the corrugated plate 60, and the corrugated plate 60 can further disperse the mixture of propylene, methanol and hydrogen peroxide, so that the droplets of the mixture of propylene, methanol and hydrogen peroxide are micro-interfaced, the interfacial area of the mixture of propylene, methanol and hydrogen peroxide is increased, the mass transfer efficiency of propylene, methanol and hydrogen peroxide is enhanced, and the conversion rate of propylene oxide is improved.
[0073] Furthermore, the mixture of propylene, methanol and hydrogen peroxide can be sprayed out from the guide tube 90 on the distribution plate 70. Due to the obstruction of the ridge-shaped baffle 80, the mixture of propylene, methanol and hydrogen peroxide can be sprayed from the two ends of the ridge-shaped baffle 80 along the ridge to the outer ridge surface of the adjacent ridge-shaped baffle 80. After reflection from the outer ridge surface, the mixture of propylene, methanol and hydrogen peroxide can be sprayed to the inlet of the reactor cylinder in a direction perpendicular to the distribution plate 70. Since the liquid outlets 71 are evenly distributed on the distribution plate 70, the angle between the ridges of the two baffles is usually set to 90 degrees, so the mixture of propylene, methanol and hydrogen peroxide can be sprayed more evenly into the inlet of the reactor cylinder in the vertical direction. Since the catalyst is at the inlet of the reactor cylinder, the mixture of propylene, methanol and hydrogen peroxide can be more evenly contacted with the catalyst, thereby increasing the reaction speed.
[0074] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0075] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0076] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0077] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0078] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.
Claims
1. A feeding device, characterized in that: The feeding device comprises: A venturi tube is arranged vertically, and a diffusion hole is arranged on the peripheral surface of the diffusion section of the venturi tube; The feed cylinder at least comprises a first cylinder covering the outer side of the venturi tube, wherein the first cylinder and the venturi tube form a first feed cavity, and a feed hole is arranged on the peripheral surface of the first cylinder.
2. The feeding device according to claim 1, characterized in that: The feeding device also includes: A feed pipe, wherein the feed port of the feed pipe is located outside the venturi tube, and the discharge port of the feed pipe extends to the inlet section of the venturi tube.
3. The feeding device according to claim 2, characterized in that: The discharge port of the feed pipe extends through the inlet section of the venturi tube to the throat of the venturi tube, and the discharge port of the feed pipe faces the diffuser section.
4. The feeding device according to claim 2 or 3, characterized in that: The feeding device also includes: A nozzle is connected to the discharge port of the feed pipe, and the outlet of the nozzle faces the diffusion section; or, the diameter of the feed pipe gradually decreases along the direction approaching the discharge port.
5. The feeding device according to claim 1, characterized in that: A plurality of diffusion holes are provided and are evenly distributed on the circumference of the diffusion section.
6. The feeding device according to claim 1, characterized in that: The feeding device comprises: An extension tube, the inlet of which is in communication with the diffuser section; A corrugated plate is arranged in the extension tube, and the plane where the corrugated plate is located is perpendicular to the axis of the extension tube.
7. The feeding device according to claim 6, characterized in that: The corrugated plates are provided in multiple groups and are stacked along the axial direction of the extension tube.
8. The feeding device according to claim 6, characterized in that: The feeding device also includes: A distribution plate, the distribution plate is located in the extension tube and on the side of the corrugated plate away from the diffusion section, the plane where the distribution plate is located is perpendicular to the axis of the extension tube, and a liquid outlet is provided on the distribution plate; A plurality of groups of ridge-shaped baffles are provided, wherein the ridge-shaped baffles are located on the side of the distribution plate away from the corrugated plate, the openings of the ridge-shaped baffles cover the liquid outlet in a direction perpendicular to the axis of the extension tube, and the spines of two adjacent ridge-shaped baffles are arranged at an angle.
9. The feeding device according to claim 8, characterized in that: The feeding device also includes: A guide tube, one end of which is connected to the liquid outlet, and the other end of which extends toward the spine of the ridge-shaped baffle.
10. A feeding method, characterized in that: The feeding method is implemented by using a feeding device according to any one of claims 1 to 9, and the feeding method comprises: continuously feeding a first material into an inlet section of the venturi tube, wherein the first material is formaldehyde; Continuously feeding the second material into the feed pipe, so that the second material is transported from the outlet of the feed pipe to the roar of the venturi tube and mixed with the second material to form a first mixed material, wherein the second material is hydrogen peroxide; The third material is continuously fed into the first feed cavity, so that the third material is mixed with the first mixed material through the diffusion hole to form a second mixed material, and the second mixed material is transported to the outlet of the extension cylinder through the corrugated plate, the distribution plate and the ridge baffle. The third material is propylene.