Catalyst recycling device for dimethyl carbonate synthesis

Abstract

The utility model relates to the field of catalyst recycling technology, especially relates to a carbonic acid dimethyl ester synthesis is with catalyst recycling device. Including recovery jar, the recovery jar is installed with the stirring assembly for stirring catalyst, the recovery jar is installed with the heating assembly for heating catalyst, recovery assembly is installed on the recovery jar for recycling the hot air of discharge, the utility model discloses through the setting of recovery assembly, and the recovery jar exhausts the hot and humid gas and exchanges heat with the outside air in the heating box, and the preheating of air is carried out, thereby reducing the temperature difference of the air that advances the wind and heats to dry exhaust air, realizes the recycling of the waste heat in the hot and humid gas, reduces the energy waste that the direct discharge of heat causes, and reduces the energy consumption cost of heating process.

Description

Technical Field

[0001] This invention belongs to the field of catalyst recycling technology, and specifically relates to a catalyst recycling device for dimethyl carbonate synthesis. Background Technology

[0002] In the production of dimethyl carbonate, sodium methoxide is generally used as a catalyst. After the production and processing are completed, the deactivated sodium methoxide is usually recycled and reused. The existing recycling method is to remove the moisture from the deactivated sodium methoxide by heating and drying. However, the commonly used heating and drying equipment can only heat and dry a local area, resulting in low drying efficiency and thus increasing the time cost of drying the deactivated sodium methoxide.

[0003] A search revealed that patent application CN202322173521.4 discloses a dimethyl carbonate catalyst drying device, including a base with a processing chamber embedded in its upper end. A first motor is fixedly installed on the upper end of the processing chamber, and a drive shaft is fixedly connected to the output end of the first motor. When using this device, the first motor is first started, driving the first shaft to rotate, which in turn drives the stirring blades to stir the sodium methoxide. Simultaneously, a hot air blower is started, allowing hot air to be sprayed out through jet holes to continuously heat and dry the sodium methoxide. Air outlets on the stirring blades simultaneously spray hot air, ensuring that the sodium methoxide at different locations is simultaneously and continuously heated while being stirred by the stirring blades, resulting in faster and more efficient heating. Furthermore, by starting the second motor, a transmission mechanism is driven to rotate, causing the auger to rotate, thereby continuously turning the sodium methoxide at the bottom of the processing chamber upwards, further improving the heating and drying efficiency.

[0004] However, the above-mentioned dimethyl carbonate catalyst drying device still has the following drawbacks:

[0005] The aforementioned drying device continuously heats and dries sodium methoxide by spraying hot air through jet holes, while the stirring blades have air outlets that simultaneously spray hot air. This allows the sodium methoxide at different locations to be heated simultaneously and continuously while the stirring blades are stirring it. The heated humid gas is directly discharged from the exhaust valve, and the discharged humid gas carries a large amount of heat, resulting in the waste of energy because the residual heat is not effectively utilized.

[0006] Therefore, we need to propose a catalyst recycling device for dimethyl carbonate synthesis to solve the above problems. Utility Model Content

[0007] The purpose of this invention is to provide a catalyst recycling device for dimethyl carbonate synthesis. By setting up a recycling component, the humid and hot gas discharged from the recycling tank exchanges heat with the outside air in the heating box through a heat exchanger, preheating the air and thus reducing the temperature difference between the inlet air heating and the dry outlet air. This realizes the recycling of waste heat in the humid and hot gas, reduces energy waste caused by direct heat emission, and lowers the energy consumption cost of the heating process, thereby solving the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a catalyst recycling device for the synthesis of dimethyl carbonate, comprising a recycling tank, wherein a stirring assembly for stirring the catalyst is installed inside the recycling tank, a heating assembly for heating the catalyst is installed inside the recycling tank, and a recycling assembly for recycling the discharged hot air is installed on the recycling tank.

[0009] The recycling assembly includes a heating box and a heat exchange mechanism. The heating box is installed on the recycling tank, and the heat exchange mechanism is installed inside the heating box. One end of the heating box has an open structure, and a dustproof net can be detachably installed at the opening of the heating box.

[0010] Furthermore, the heat exchange mechanism includes a heat exchange tube installed inside the heating box. The heat exchange tube has an S-shaped structure, with both ends extending to the outside of the heating box, and one end of the heat exchange tube is installed on the side wall of the recovery tank.

[0011] Furthermore, the stirring assembly includes a stirring rod and a driving mechanism. The stirring rod is rotatably connected inside the recycling tank, and one end of the stirring rod extends to the outside of the recycling tank. Multiple sets of stirring blades are installed on the stirring rod. The driving mechanism is installed on the top of the recycling tank, and the driving mechanism and the stirring rod are connected in a transmission manner.

[0012] Furthermore, the drive mechanism includes a motor, which is mounted on the top of the recycling tank. The output end of the motor is connected to a rotating shaft, and a first gear is mounted on one end of the rotating shaft. A second gear meshes with the first gear, and the second gear is mounted on the stirring rod.

[0013] Furthermore, the heating assembly includes a hot air blower, which is installed on top of the recovery tank. The two ends of the hot air blower are respectively connected to a first connecting pipe and a second connecting pipe. One end of the first connecting pipe is connected to the heating box, and one end of the second connecting pipe is connected to one end of the stirring rod through a sealed bearing.

[0014] Furthermore, the heating assembly also includes multiple sets of air vents, each set of air vents being opened on multiple sets of stirring blades, and each set of air vents being provided with a barrier mesh. The stirring rod and the multiple sets of stirring blades are hollow and connected to each other.

[0015] Furthermore, the heating assembly also includes a horizontal plate, which is fixedly mounted on the stirring rod. The horizontal plate is hollow and connected to the stirring rod. Multiple jet nozzles are provided at the bottom of the horizontal plate.

[0016] Furthermore, the top of the recycling tank is equipped with a feed inlet, the bottom of the recycling tank is equipped with a discharge outlet, and an exhaust valve is installed on the side wall of the recycling tank, the exhaust valve being connected to the heat exchange tube.

[0017] The beneficial effects of this utility model are:

[0018] This invention, through the setting of the recovery component, allows the humid and hot gas discharged from the recovery tank to exchange heat with the outside air in the heating box through a heat exchanger, thereby preheating the air and reducing the temperature difference between the inlet air heating and the dry outlet air. This realizes the recycling of waste heat in the humid and hot gas, reduces energy waste caused by direct heat emission, and lowers the energy consumption cost of the heating process. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the isometric structure of the recycling tank according to an embodiment of the present invention is shown;

[0021] Figure 2 A top view of the recycling tank according to an embodiment of the present invention is shown;

[0022] Figure 3 A schematic diagram of the internal structure of the heating box according to an embodiment of the present invention is shown;

[0023] Figure 4 A schematic diagram of a portion of the stirring assembly according to an embodiment of the present invention is shown.

[0024] In the diagram: 110, recovery tank; 120, feed inlet; 130, discharge outlet; 140, exhaust valve; 210, stirring rod; 220, stirring blade; 230, motor; 240, rotating shaft; 250, first gear; 260, second gear; 310, hot air blower; 320, first connecting pipe; 330, second connecting pipe; 340, air outlet; 350, barrier net; 360, horizontal plate; 370, jet nozzle; 410, heating box; 420, dustproof net; 430, heat exchange tube. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] Please see Figure 1-4 This utility model provides a technical solution:

[0027] A device for recycling catalysts used in the synthesis of dimethyl carbonate.

[0028] It includes a recovery tank 110, which is equipped with a stirring assembly for stirring the catalyst, a heating assembly for heating the catalyst, and a recovery assembly for recovering and reusing the exhaust hot air.

[0029] The recovery tank 110, as the core container of the entire unit, is typically made of high-temperature and corrosion-resistant metal materials (such as stainless steel). Its internal space is used to store the catalyst to be processed. The tank structure is designed to ensure airtightness, preventing catalyst leakage and the entry of external impurities. The stirring component mixes the catalyst evenly through stirring, promoting full contact between the catalyst and the heating medium, improving heating efficiency and catalyst activation. The heating component provides a suitable temperature environment for the catalyst, allowing it to recover its activity or undergo specific physicochemical changes. The recovery component recovers and reuses the hot air generated during the heating process, avoiding heat waste and reducing energy consumption. These three components work together: the stirring component ensures uniform heating of the catalyst, the heating component activates the catalyst, and the recovery component recovers waste heat, collectively achieving efficient recycling of the catalyst, reducing the cost of dimethyl carbonate synthesis, and improving resource utilization.

[0030] The recycling assembly includes a heating box 410 and a heat exchange mechanism. The heating box 410 is installed on the recycling tank 110, and the heat exchange mechanism is installed inside the heating box 410. One end of the heating box 410 has an open structure, and a dustproof net 420 is detachably installed at the opening of the heating box 410.

[0031] The heating chamber 410 typically uses a metal shell, providing excellent insulation and reducing heat loss. It is installed on the recovery tank 110 and connected to the internal hot air circulation system. The heat exchange mechanism is the core component of the recovery assembly, responsible for heat exchange between the hot air and the outside air. The open structure of the heating chamber 410 facilitates airflow, allowing air to smoothly enter and exchange heat with the heat exchange mechanism. A removable dust filter 420 is installed at the opening, effectively preventing dust and impurities from entering the heating chamber 410. This prevents them from adhering to the surface of the heat exchange mechanism and affecting heat exchange efficiency, and also prevents them from entering the heating assembly and recovery tank 110, thus avoiding damage to the heating assembly and contamination of the catalyst. It also facilitates disassembly and cleaning, ensuring the cleanliness of the interior of the heating chamber 410. When the hot air generated in the recovery tank 110 enters the heating box 410 through the heat exchange mechanism, the heat exchange mechanism exchanges heat with the air in the heating box 410, thereby preheating the air entering the heating component and realizing the recovery and reuse of heat. The cold air after heat exchange is discharged from the opening, forming a channel for the circulation of hot air.

[0032] The heat exchange mechanism includes a heat exchange tube 430, which is installed inside the heating box 410. The heat exchange tube 430 has an S-shaped structure, with both ends of the heat exchange tube 430 extending to the outside of the heating box 410, and one end of the heat exchange tube 430 is installed on the side wall of the recovery tank 110.

[0033] The heat exchange tube 430 is typically made of a metal material with excellent thermal conductivity (such as copper or stainless steel). Its S-shaped structure design significantly increases the contact area and contact time with air, enhancing the heat exchange effect. One end of the heat exchange tube 430 is welded to the side wall of the recovery tank 110 or connected via a flange, allowing hot air inside the recovery tank 110 to flow into the heat exchange tube 430. When the hot air flows inside the S-shaped heat exchange tube 430, heat is transferred to the air outside the tube through the tube wall, achieving heat transfer.

[0034] The stirring assembly includes a stirring rod 210 and a driving mechanism. The stirring rod 210 is rotatably connected inside the recycling tank 110, and one end of the stirring rod 210 extends to the outside of the recycling tank 110. Multiple sets of stirring blades 220 are installed on the stirring rod 210. The driving mechanism is installed on the top of the recycling tank 110, and the driving mechanism and the stirring rod 210 are connected in a transmission manner.

[0035] The stirring rod 210 is typically a metal rod, connected to the top and bottom of the recovery tank 110 via bearings and other rotating components, ensuring flexible rotation within the tank. Stirring blades 220 are mounted on the stirring rod 210; their number, shape, and angle are designed according to the catalyst's characteristics and stirring requirements. These blades effectively agitate the catalyst as the stirring rod 210 rotates, ensuring uniform mixing and preventing localized accumulation or uneven heating. A drive mechanism, mounted on the top of the recovery tank 110, provides rotational power to the stirring rod 210. When activated, the drive mechanism transmits power to the stirring rod 210, causing it and the stirring blades 220 to rotate, thus agitating the catalyst within the recovery tank 110. The operation of this stirring assembly allows the catalyst to come into more complete contact with hot air during heating, accelerating catalyst activation and improving the efficiency and quality of catalyst recycling.

[0036] The driving mechanism includes a motor 230, which is mounted on the top of the recycling tank 110. The output end of the motor 230 is connected to a rotating shaft 240. A first gear 250 is mounted on one end of the rotating shaft 240. A second gear 260 meshes with the first gear 250. The second gear 260 is mounted on the stirring rod 210.

[0037] The motor 230, serving as the power source for the drive mechanism, is typically selected to have a stable speed and sufficient torque. It is installed on top of the recovery tank 110, and a sealed structure prevents catalyst dust and other contaminants from entering the motor 230 and affecting its normal operation. The output end of the motor 230 is connected to the rotating shaft 240 via a coupling or other transmission components, transmitting the rotational motion of the motor 230 to the rotating shaft 240. The first gear 250 is fixedly mounted on one end of the rotating shaft 240, and the second gear 260 is mounted on the stirring rod 210. The two gears mesh to form a gear transmission mechanism. When the motor 230 drives the rotating shaft 240 to rotate, the first gear 250 rotates accordingly, driving the second gear 260 and the stirring rod 210 to rotate through gear meshing. Gear transmission offers advantages such as accurate transmission ratio, high transmission efficiency, and compact structure. It can precisely control the speed of the stirring rod 210, adjusting the stirring speed according to different catalyst processing requirements to ensure stirring effect. Simultaneously, stable transmission performance ensures long-term reliable operation of the stirring assembly, providing stable power for uniform stirring of the catalyst.

[0038] The heating assembly includes a hot air blower 310, which is installed on the top of the recovery tank 110. The two ends of the hot air blower 310 are respectively connected to a first connecting pipe 320 and a second connecting pipe 330. One end of the first connecting pipe 320 is connected to the heating box 410, and one end of the second connecting pipe 330 is connected to one end of the stirring rod 210 through a sealed bearing.

[0039] The hot air blower 310 is the core equipment of the heating assembly, capable of generating high-temperature hot air to provide a heat source for catalyst heating. The hot air blower 310 is installed on top of the recovery tank 110, with its two ends connected to a first connecting pipe 320 and a second connecting pipe 330, respectively. The first connecting pipe 320 transfers preheated air from the heating chamber 410 to the hot air blower 310, reducing the temperature difference between the incoming heated air and the dry outgoing air, thus lowering the workload of the hot air blower 310. The second connecting pipe 330 is connected to one end of the stirring rod 210 via a sealed bearing, ensuring that hot air does not leak during the rotation of the stirring rod 210. The hot air enters the interior of the stirring rod 210 through the second connecting pipe 330 and is then blown out through the air outlet 340 on the stirring blades 220, directly acting on the catalyst to achieve uniform heating. This heating method allows hot air to penetrate deep into the catalyst, improving heating efficiency and uniformity. Simultaneously, in conjunction with the stirring assembly, it ensures that the catalyst is fully heated during stirring, effectively promoting catalyst activation and regeneration, and ensuring the effectiveness of catalyst recycling.

[0040] The heating assembly also includes multiple sets of air outlets 340, which are all located on multiple sets of stirring blades 220. Each set of air outlets 340 is provided with a barrier mesh 350. The stirring rod 210 and the multiple sets of stirring blades 220 are hollow and connected to each other.

[0041] The air outlets 340 on the stirring blades 220 are evenly distributed, and their size and number are designed according to the hot air flow rate and catalyst heating requirements. Hot air enters the stirring blades 220 through the interior of the stirring rod 210 and is then blown out through the air outlets 340, directly acting on the catalyst to achieve heating. A barrier mesh 350, made of high-temperature resistant and corrosion-resistant metal mesh or filter material, is installed inside the air outlets 340 to prevent catalyst particles from entering the interior of the stirring rod 210, avoiding blockage of the hot air passage and ensuring smooth flow of hot air. The hollow structure of the stirring rod 210 and stirring blades 220 forms a hot air transmission channel, allowing the hot air generated by the hot air blower 310 to enter the stirring blades 220 from the stirring rod 210 and then be evenly blown onto the catalyst through the air outlets 340. This design allows the hot air to fully contact the catalyst, improving the heating effect while preventing catalyst blockage of the pipes, ensuring the long-term stable operation of the heating components, and providing a guarantee for the efficient heating and recycling of the catalyst.

[0042] The heating assembly also includes a horizontal plate 360, which is fixedly mounted on the stirring rod 210. The horizontal plate 360 ​​is hollow and connected to the stirring rod 210. Multiple sets of jet nozzles 370 are provided at the bottom of the horizontal plate 360.

[0043] The horizontal plate 360 ​​is generally made of high-temperature resistant, high-strength metal material and is fixedly installed on the stirring rod 210 by welding or bolting, rotating together with the stirring rod 210. The interior of the horizontal plate 360 ​​is hollow and connected to the hot air channel inside the stirring rod 210, allowing the hot air generated by the hot air blower 310 to flow smoothly into the interior of the horizontal plate 360. The jet nozzles 370 at the bottom of the horizontal plate 360 ​​are made of high-temperature resistant alloy material, and their number, shape, and distribution are carefully designed according to the distribution of the catalyst in the recovery tank 110, usually in a uniform array. When hot air enters the horizontal plate 360 ​​through the stirring rod 210, it is sprayed out by the jet nozzles 370 at a specific angle and flow rate, directly acting on the surface area of ​​the catalyst. Compared with heating only through the air outlet 340 of the stirring blades 220, the arrangement of the horizontal plate 360 ​​and the jet nozzles 370 can heat the catalyst from different angles and positions, further improving the uniformity and efficiency of heating, ensuring that all parts of the catalyst are fully heated, accelerating the activation and regeneration process of the catalyst, and improving the overall effect of catalyst recycling. Meanwhile, the jet head 370 can also enhance the disturbance to the catalyst to a certain extent, and together with the stirring blades 220, make the catalyst more thoroughly mixed.

[0044] The top of the recycling tank 110 is equipped with a feed inlet 120, the bottom of the recycling tank 110 is equipped with a discharge outlet 130, and an exhaust valve 140 is installed on the side wall of the recycling tank 110. The exhaust valve 140 is connected to the heat exchange tube 430.

[0045] The inlet 120 is located at the top of the recovery tank 110 and is used to transport the catalyst to be treated into the recovery tank 110. Its diameter is designed according to the catalyst's delivery method and flow rate to ensure that the catalyst can smoothly enter the recovery tank 110. The outlet 130 is installed at the bottom of the recovery tank 110. After stirring and heating, the catalyst is discharged from the outlet 130 and enters the subsequent use or storage stage. The structural design of the outlet 130 facilitates the control of the catalyst discharge rate and flow rate. The exhaust valve 140 is installed on the side wall of the recovery tank 110 and connected to the heat exchange tube 430. When the pressure inside the recovery tank 110 is too high or when it is necessary to discharge the waste gas generated during the heating process, the exhaust valve 140 opens, and hot air enters the heat exchange tube 430 through the exhaust valve 140. After heat recovery in the heat exchange tube 430, it is discharged. The exhaust valve 140 ensures stable pressure inside the recovery tank 110, preventing damage to the tank body and internal components due to excessive pressure. At the same time, it introduces hot air into the recovery components for heat recovery and utilization, improving energy utilization efficiency and achieving energy-saving and environmentally friendly operation of the device.

[0046] Specifically, the internal electrical connection structure, specific structure, and model of the motor 230 and the hot air blower 310 are well known to those skilled in the art and will not be described in detail here. All electrical components appearing in this application are connected to an external power source during use.

[0047] The circuits, electrical components, and modules involved are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The scope of protection of this utility model does not involve any improvement to the software.

[0048] The control method described in this application is automatic control via a controller. The controller's control circuit can be easily implemented by those skilled in the art through simple programming, and is common knowledge in the field. Furthermore, since this application is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

[0049] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A catalyst recycling device for dimethyl carbonate synthesis, characterized in that: It includes a recovery tank (110), which is equipped with a stirring assembly for stirring the catalyst, a heating assembly for heating the catalyst, and a recovery assembly for recovering and utilizing the exhaust hot air. The recycling assembly includes a heating box (410) and a heat exchange mechanism. The heating box (410) is installed on the recycling tank (110), and the heat exchange mechanism is installed inside the heating box (410). One end of the heating box (410) is an open structure, and a dustproof net (420) is detachably installed at the opening of the heating box (410).

2. The device for recycling catalysts for dimethyl carbonate synthesis according to claim 1, characterized in that: The heat exchange mechanism includes a heat exchange tube (430), which is installed inside the heating box (410). The heat exchange tube (430) has an S-shaped structure, and both ends of the heat exchange tube (430) extend to the outside of the heating box (410). One end of the heat exchange tube (430) is installed on the side wall of the recovery tank (110).

3. The device for recycling a catalyst used in the synthesis of dimethyl carbonate according to claim 2, characterized in that: The stirring assembly includes a stirring rod (210) and a driving mechanism. The stirring rod (210) is rotatably connected inside the recycling tank (110), and one end of the stirring rod (210) extends to the outside of the recycling tank (110). Multiple sets of stirring blades (220) are installed on the stirring rod (210). The driving mechanism is installed on the top of the recycling tank (110), and the driving mechanism and the stirring rod (210) are connected in a transmission manner.

4. The device for recycling a catalyst used in the synthesis of dimethyl carbonate according to claim 3, characterized in that: The drive mechanism includes a motor (230) mounted on the top of the recycling tank (110). The output end of the motor (230) is connected to a rotating shaft (240). A first gear (250) is mounted on one end of the rotating shaft (240). A second gear (260) meshes with the first gear (250). The second gear (260) is mounted on the stirring rod (210).

5. The device for recycling a catalyst used in the synthesis of dimethyl carbonate according to claim 4, characterized in that: The heating assembly includes a hot air blower (310), which is installed on top of the recovery tank (110). The two ends of the hot air blower (310) are respectively connected to a first connecting pipe (320) and a second connecting pipe (330). One end of the first connecting pipe (320) is connected to the heating box (410), and one end of the second connecting pipe (330) is connected to one end of the stirring rod (210) through a sealed bearing.

6. The device for recycling a catalyst used in the synthesis of dimethyl carbonate according to claim 5, characterized in that: The heating assembly also includes multiple sets of air outlets (340), which are all opened on multiple sets of stirring blades (220). Each set of air outlets (340) is provided with a barrier mesh (350). The stirring rod (210) and the multiple sets of stirring blades (220) are hollow and connected to each other.

7. The device for recycling a catalyst used in the synthesis of dimethyl carbonate according to claim 6, characterized in that: The top of the recycling tank (110) is equipped with a feed inlet (120), the bottom of the recycling tank (110) is equipped with a discharge outlet (130), and an exhaust valve (140) is installed on the side wall of the recycling tank (110). The exhaust valve (140) is connected to the heat exchange tube (430).

Images