A temperature-adjustable reactor for preparing ethylene carbonate

Abstract

The invention provides a temperature-adjustable reactor for preparing ethylene carbonate, which comprises a reaction component and a temperature regulating component. For the preparation process of ethylene carbonate, the high-temperature reaction in the reaction stage and the cooling reaction in the later stage are integrated together, that is, the high-temperature heating reaction is first realized by a high-temperature control structure, and then when cooling is required in the later stage or the reaction is carried out at a lower temperature, the reaction is carried out by the low-temperature control structure. Such a technical solution can reduce the multiple transfers of materials and the frequent replacement and use of reaction containers, and realize the reaction operation concentrated in a relatively fixed area, thereby reducing the workload. Such a reaction process is very suitable for small-scale chemical tests and pilot chemical tests.

Description

Technical Field

[0001] The invention relates to a temperature-adjustable reactor for preparing ethylene carbonate, and in particular to a technology for realizing accurate and rapid control of the temperature of an intermediate reaction. Background Art

[0002] The uses of ethylene carbonate are in the electronics industry as electrolyte for the production of lithium batteries and capacitors, as a plastic foaming agent and stabilizer for synthetic lubricants, as an excellent solvent and organic synthesis intermediate, a good solvent for polyacrylonitrile and polyvinyl chloride, as a hydroxyethylating agent and chemical raw material for organic synthesis, water glass slurry, and fiber finishing agent.

[0003] There are many ways to synthesize ethylene carbonate. Among them, the patent document CN113999198A (application number CN202111500880.5) of the prior art discloses a method for synthesizing ethylene carbonate. The core reaction step thereof mentions "Step 5, heating the reaction solution to 105°C and maintaining reflux for 5h to complete the condensation reaction and obtain an orange-red solution. Step 6, cooling the orange-red solution to below 50°C. Step 7, vacuum distilling the orange-red solution to collect excess hexamethyldisilazane, ethyl diol and the fraction at 75-80℃ / 1.03kPa, which is N-trimethylsilyl imidazole, with a yield of 92%, and a content of 98% after liquid phase detection. Step 8, triphosgene and dichloromethane are stirred until dissolved, the mass ratio of triphosgene to dichloromethane is 5.94:100, and stirred until completely dissolved to obtain solution 2. In this process, N-trimethylsilyl imidazole and triphosgene generate trimethylchlorosilane and ethylene carbonate under the action of dichloromethane and 20℃. Step 9, solution 2 is cooled to below 20℃ by ice bath.

[0004] It can be seen that in this reaction process, the reaction temperature needs to be changed repeatedly, including several wide temperature ranges such as 105°C, 75-80°C and below 20°C. In actual production, 10L, 20L or 50L glass containers or plastic containers are usually used for chemical reactions. For heating above 100°C, electric heating or medium oil heating is usually used, while for heating below 30°C, cooling is usually required. Cooling usually uses cooling water or other refrigerants to cool down. It can be seen that the temperature control methods used by the two are different. Although material transfer can be used to achieve temperature control in different types of reaction vessels, this undoubtedly increases the workload and requires the use of multiple reaction vessels, which is not only inconvenient but also occupies more resources. In addition, the frequent transfer and operation of glass containers is also very likely to cause danger. Summary of the invention

[0005] In order to solve the problems existing in the above-mentioned technologies, the present invention provides a method for reducing the problem of frequent material transfer in a synthesis reaction, that is, minimizing the number of containers occupied by materials and achieving rapid temperature control changes.

[0006] The present invention provides a temperature-adjustable reactor for preparing ethylene carbonate, which comprises a reaction component and a temperature regulating component;

[0007] The reaction assembly comprises a support frame, a clamping piece, a stirring structure and a reaction container, wherein the clamping piece is arranged in the middle of the support frame, and the stirring structure is arranged on the top of the support frame;

[0008] The temperature adjustment component comprises a moving vehicle, a rotating part, a high-temperature control structure and a low-temperature control structure. The rotating part is arranged on the moving vehicle, and the high-temperature control structure and the low-temperature control structure are arranged on the rotating part. The high-temperature control structure comprises a first clamping part, and the first heating plate and the second heating plate of the first clamping part have electric heating wires or heating tubes therein, and the heating tubes have heat transfer oil therein; the low-temperature control structure comprises a second clamping part, and the first heating plate and the second heating plate of the second clamping part have cooling tubes therein, and the cooling tubes have a refrigerant medium therein.

[0009] The beneficial effect of the above scheme is as follows: for the preparation process of ethylene carbonate, the high-temperature reaction in the reaction stage and the cooling reaction in the later stage are integrated together, that is, the high-temperature heating reaction is first realized through the high-temperature control structure, and then when cooling is required in the later stage or the reaction is carried out at a lower temperature, the reaction is carried out through the low-temperature control structure. Such a technical scheme can reduce the multiple transfers of materials and the frequent replacement of reaction vessels, and realize the reaction operation concentrated in a relatively fixed area, reducing the workload. Such a reaction process is very suitable for chemical small-scale tests and chemical pilot tests, that is, reactions with a reaction volume of less than 20L, such as 5L, 500ML.

[0010] A preferred solution is that the stirring structure includes an extension plate, a stirring motor and a stirring rod, the stirring motor is arranged on the upper side of the extension plate, the stirring motor is connected to the stirring rod, and the bottom of the stirring rod is detachably arranged in the reaction container;

[0011] The reaction container has a plurality of feeding ports, each of which is provided with a sealing plug;

[0012] The bottom of the reaction container is provided with a discharge port, and an outlet valve is arranged on the discharge port;

[0013] It also includes a fraction collector, which has a collecting bottle, and the upper inlet of the collecting bottle is connected to the gas outlet of the reaction container through a condenser; the bottom of the collecting bottle is provided with a discharge port, which is connected to the feed port of the reaction container through a guide pipe, and the discharge port has a discharge valve.

[0014] The beneficial effects of the above scheme are: the required reaction materials can be conveniently added to the reaction container through the setting of the feeding port, and the materials in the reaction container can be conveniently transferred away when needed through the discharge port at the bottom. According to the characteristics of this reaction, fractions need to be collected during the reaction, and the fractions can be collected by condensation of the condensation tank in the prior art, and preferably, the reaction container can be provided with a negative pressure environment for condensation, and the corresponding required fractions can be collected after condensation.

[0015] The fractions that need to undergo a secondary reaction can be transferred to the reaction vessel in the reverse direction. The transfer can be manually assisted or automatically performed.

[0016] A preferred solution is that the first clamping member and the second clamping member have a mounting plate, a driving motor, a driving sector tooth, a driven sector tooth, a first driving rod, a second driving rod, a first bending rod, a second bending rod, a first stabilizing rod and a second stabilizing rod, the driving motor is arranged at the bottom of the mounting plate, the driving motor is connected to the driving sector tooth, the driving sector tooth is meshed with the driven sector tooth, the driving sector tooth is connected to a first circular plate at the inner end of the first driving rod, the first circular plate is rotatably arranged on the mounting plate, the outer end of the first driving rod is hinged to the inner end of the first bending rod, the middle part of the first bending rod is hinged to the first stabilizing rod, and the inner end of the first stabilizing rod is hinged to the mounting plate; the first heating plate is arranged at the outer end of the first bending rod;

[0017] The inner end of the second driving rod is on the second circular plate, the second circular plate is rotatably arranged on the mounting plate, the outer end of the second driving rod is hinged to the inner end of the second bending rod, the middle part of the second bending rod is hinged to the second stabilizing rod, and the inner end of the second stabilizing rod is hinged to the mounting plate; the second heating plate is arranged on the outer end of the second bending rod, and the first heating plate and the second heating plate constitute a heating unit; the first clamping member and the second clamping member have the same structure.

[0018] The working method of the temperature-adjustable reactor for preparing ethylene carbonate provided by the present invention comprises the following steps:

[0019] S1, taking the reaction liquid of ethylene glycol and N'N-carbonyldiimidazole, filtering to obtain filtrate 1, adding imidazole powder, filtering again to obtain filtrate 2, adding hexamethyldisilazane to the filtrate 2, stirring, adding a catalyst and heating to obtain reaction liquid 2;

[0020] S2: adding the reaction solution 2 into the reaction container, and then heating to 105°C, and maintaining reflux at 105°C for 5 hours to obtain an orange-red reaction solution. During the heating process, the high temperature control structure is used to heat the reaction container so that the temperature is maintained at 105°C;

[0021] S3: After the reaction is finished, the high temperature control structure and the low temperature control structure are switched, and the high temperature control structure and the low temperature control structure are turned by the rotation of the rotating member, so that the second clamping member of the low temperature control structure is attached to the outer wall of the reaction container, and then the cooling is completed by the coolant medium in the cooling conduit; the temperature is maintained below 50°C;

[0022] S4: rotating the first clamping member or the second clamping member to heat, distilling out the fraction N-trimethylsilimidazole, and then opening the bottom opening of the reaction container to discharge the residual reaction liquid in the reaction container;

[0023] S5: Add the fraction N-trimethylsilyl imidazole into the reaction container in reverse, add triphosgene and dichloromethane into the reaction container and stir until dissolved to obtain Solution 2, which forms ethylene carbonate at a temperature below 20°C; control the temperature of the reaction container by a cooling conduit in the low-temperature control structure to maintain it below 20°C.

[0024] The working method of the temperature-adjustable reactor for preparing ethylene carbonate provided by the present invention comprises the following steps: driving the stirring rod by the stirring motor so that the stirring rod stirs in the reaction container, and controlling the outlet valve at the bottom of the reaction container so that the discharge port selectively discharges the liquid in the reaction container;

[0025] The reaction liquid in the reaction container collects fractions into a collecting bottle by distillation, and the fractions in the collecting bottle are reversely transferred to the reaction container through the discharge port.

[0026] The working method of the temperature-adjustable reactor for preparing ethylene carbonate provided by the present invention comprises the following steps:

[0027] The driving motor provides power to rotate the driving sector teeth, and when the driving sector teeth rotate, the first driving rod drives the first bending rod to move, thereby causing the first heating plate to form a clamping action or an unfolding action, and when the clamping action is implemented, the first heating plate is close to the reaction container to form temperature control; at the same time, the driving sector teeth drive the driven sector teeth to move, and the driven sector teeth cause the second driving rod and the second bending rod to move, thereby causing the second heating plate to be close to or away from the reaction container, thereby controlling the temperature of the reaction container;

[0028] And through the rotation of the rotating part, the high temperature control structure and the low temperature control structure selectively control the temperature of the reaction container. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of a plan view of a temperature-adjustable reactor for preparing ethylene carbonate according to the present invention;

[0030] Figure 2 It is a schematic structural diagram of a temperature-adjustable reactor for preparing ethylene carbonate according to the present invention;

[0031] Figure 3 It is a schematic structural diagram of a temperature-adjustable reactor for preparing ethylene carbonate according to the present invention;

[0032] Figure 4 It is a partial structural schematic diagram of a temperature-adjustable reactor for preparing ethylene carbonate according to the present invention;

[0033] Figure 5 It is a structural schematic diagram of a temperature regulating assembly of a reactor for preparing ethylene carbonate with adjustable temperature according to the present invention;

[0034] Figure 6 The present invention is a schematic diagram of the structure of a part of a temperature-adjustable reactor for preparing ethylene carbonate. DETAILED DESCRIPTION

[0035] First embodiment:

[0036] like Figures 1 to 3 As shown, the present invention provides a temperature-adjustable reactor for preparing ethylene carbonate, which includes a reaction component 10 and a temperature adjustment component 60;

[0037] The reaction assembly 10 comprises a support frame 20, a clamping member 30, a stirring structure 40 and a reaction container 50. The clamping member 30 is arranged in the middle of the support frame 20, and the stirring structure 40 is arranged on the top of the support frame 20.

[0038] The temperature adjustment component 60 has a moving vehicle 61, a rotating part 70, a high-temperature control structure 80 and a low-temperature control structure 90. The rotating part 70 is arranged on the moving vehicle 61, and the high-temperature control structure 80 and the low-temperature control structure 90 are arranged on the rotating part 70. The high-temperature control structure 80 has a first clamping part 100. The first heating plate 101 and the second heating plate 111 of the first clamping part 100 have electric heating wires or heating tubes, and the heating tubes have heat transfer oil; the low-temperature control structure 90 has a second clamping part 110. The first heating plate 101 and the second heating plate 111 of the second clamping part 110 have cooling tubes, and the cooling tubes have a cold medium.

[0039] The working method of the temperature-adjustable reactor for preparing ethylene carbonate provided by the present invention comprises the following steps:

[0040] S1, taking the reaction liquid of ethylene glycol and N'N-carbonyldiimidazole, filtering to obtain filtrate 1, adding imidazole powder, filtering again to obtain filtrate 2, adding hexamethyldisilazane to filtrate 2, stirring, adding a catalyst to heat, and obtaining reaction liquid 2; this step is obtained by the method of the prior art;

[0041] S2: adding the reaction solution 2 into the reaction container 50, and then heating to 105°C, and maintaining reflux at 105°C for 5 hours to obtain an orange-red reaction solution. During the heating process, the high temperature control structure 80 is used to heat the reaction container 50 so that the temperature is maintained at 105°C;

[0042] S3: After the reaction is finished, the high temperature control structure 80 and the low temperature control structure 90 are switched, and the high temperature control structure 80 and the low temperature control structure 90 are turned by the rotation of the rotating member 70, so that the second clamping member 110 of the low temperature control structure 90 is attached to the outer wall of the reaction container 50, and then the cooling is completed by the coolant medium in the cooling conduit; the temperature is maintained below 50°C; at this stage, the temperature in the low temperature control structure 90 can be room temperature or a liquid medium at room temperature is introduced to cool it;

[0043] S4: distilling out the fraction N-trimethylsilyl imidazole, collecting the fraction with a collecting bottle, and if there are multiple fractions, they can be collected with collecting bottles respectively, and then opening the opening (discharging port) 52 at the bottom of the reaction container 50 to discharge the residual reaction liquid in the reaction container;

[0044] S5: Add the fraction N-trimethylsilyl imidazole into the reaction container in reverse, add triphosgene and dichloromethane into the reaction container and stir until dissolved to obtain Solution 2, which forms ethylene carbonate at a temperature below 20°C; control the temperature of the reaction container by a cooling conduit in the low-temperature control structure to maintain it below 20°C.

[0045] Second embodiment:

[0046] like Figure 3 and Figure 4 As shown, the stirring structure 40 includes an extension plate 41, a stirring motor 42 and a stirring rod 43. The stirring motor 42 is arranged on the upper side of the extension plate 41, and the stirring motor 42 is connected to the stirring rod 43. The bottom of the stirring rod 43 is detachably arranged in the reaction container 50.

[0047] The reaction container 50 has a plurality of feeding ports 51, and the feeding ports 51 are provided with sealing plugs;

[0048] The bottom of the reaction container 50 is provided with a discharge port 52, and an outlet valve is provided on the discharge port 52;

[0049] It also includes a fraction collector 120, which has a collecting bottle 121, and an upper inlet 122 of the collecting bottle 121 is connected to the gas outlet 53 of the reaction container 50 through a condenser 125; the bottom of the collecting bottle 121 has a discharge port 123, which is connected to the feed port 51 of the reaction container 50 through a guide pipe 124, and the discharge port 123 has a discharge valve.

[0050] like Figure 6 As shown, in the preferred embodiment, the height of the collecting bottle 121 is higher than the feeding port 51, so that the material in the collecting bottle 121 can be more conveniently discharged into the reaction container through the pipeline to carry out the subsequent reaction under the cooling environment, that is, the process is performed: the fraction N-trimethylsilyl imidazole is reversely added into the reaction container, triphosgene and dichloromethane are added into the reaction container and stirred until dissolved to obtain solution 2, and solution 2 forms ethylene carbonate at a temperature below 20° C.; that is, the temperature of the reaction container is controlled to be below 20° C. by the cooling conduit in the low temperature control structure,

[0051] The working method of the temperature-adjustable reactor for preparing ethylene carbonate provided by the present invention comprises the following steps: driving the stirring rod 43 by the stirring motor 42 so that the stirring rod 43 stirs in the reaction container 50, and controlling the outlet valve at the bottom of the reaction container 50 so that the discharge port 52 selectively discharges the liquid in the reaction container 50;

[0052] The reaction liquid in the reaction container 50 collects fractions into the collection bottle 121 by distillation, and the fractions in the collection bottle 121 are transferred to the reaction container 50 in the reverse direction through the discharge port 123 .

[0053] Third embodiment:

[0054] like Figure 5As shown, the first clamping member 100 and the second clamping member 110 have a mounting plate 151, a driving motor 152, a driving sector tooth 153, a driven sector tooth 154, a first driving rod 155, a second driving rod 156, a first bending rod 157, a second bending rod 158, a first stabilizing rod 159 and a second stabilizing rod 161, the driving motor 152 is arranged at the bottom of the mounting plate 151, the driving motor 152 is connected to the driving sector tooth 153, the driving sector tooth 153 is meshed with the driven sector tooth 154, and the driving sector tooth 155 is meshed with the driven sector tooth 154. The toothed gear 153 is connected to a first circular plate 162 at the inner end of the first driving rod 155. The first circular plate 162 is rotatably arranged on the mounting plate 151. The driving motor 152 is connected to the first circular plate 162. The outer end of the first driving rod 155 is hinged to the inner end of the first bending rod 157. The middle part of the first bending rod 157 is hinged to the first stabilizing rod 159. The inner end of the first stabilizing rod 159 is hinged to the mounting plate 151. The first heating plate 101 is arranged at the outer end of the first bending rod 157.

[0055] The inner end of the second driving rod 156 is on the second circular plate 163, and the second circular plate 163 is rotatably arranged on the mounting plate 151. The outer end of the second driving rod 156 is hinged to the inner end of the second bending rod 158, the middle part of the second bending rod 158 is hinged to the second stabilizing rod 161, and the inner end of the second stabilizing rod 161 is hinged to the mounting plate 151; the outer end of the second bending rod 158 is provided with the second heating plate 111, the first heating plate 101 and the second heating plate 111 constitute the heating unit and are used for heating or cooling the reaction container; the first clamping member 100 and the second clamping member 110 have the same structure.

[0056] The working method of the temperature-adjustable reactor for preparing ethylene carbonate provided by the present invention comprises the following steps:

[0057] The driving motor 152 provides power to rotate the first circular plate 162 and the driving sector teeth 153. When the driving sector teeth 153 rotates, the first driving rod 155 drives the first bending rod 157 to move, thereby causing the first heating plate 101 to form a clamping action or an unfolding action. When the clamping action is implemented, the first heating plate 101 is close to the reaction container 50 to form temperature control; at the same time, the driving sector teeth 153 drives the driven sector teeth 154 to move, and the driven sector teeth 154 causes the second driving rod 156 and the second bending rod 158 to move, thereby causing the second heating plate 111 to approach or move away from the reaction container 50, thereby controlling the temperature of the reaction container 50;

[0058] And through the rotation of the rotating member 70 , the high temperature control structure 80 and the low temperature control structure 90 selectively control the temperature of the reaction container 50 .

[0059] It should be noted that the synthetic production method of ethylene carbonate of the present invention adopts the technology mentioned in patent document CN113999198A (application number CN202111500880.5). The reaction steps and processes not described in detail in the present invention can adopt the technical content in the document, and can also be assisted by other technologies in the prior art that are the same as this step.

[0060] The clamping part can also adopt the mechanical gripper in the prior art, as long as it can form a clamping action, for example, the hydraulic gripper of the handling robot for grabbing heavy objects in CN202111560974.1 can be adopted, or the structure of a mechanical gripper device in CN202121220627.X can be adopted.

[0061] Preferably, the first bending rod 157 and the second bending rod 158 have mounting threaded holes, and the first heating plate and the second heating plate also have multiple groups of protrusions arranged in the height direction, and the protrusions have mounting threaded holes. Then, the height of the first heating plate and the second heating plate can be adjusted, that is, the first heating plate and the second heating plate are fastened to the first heating plate with fasteners of different heights through the protrusions. In this way, the heating plate (also called a cooling plate when cooling) can be heated or cooled at different heights, thus forming changes in height, that is, the contact height with the reaction container changes, thereby forming different temperatures or different levels of temperature control for easy use.

[0062] It also includes external equipment, that is, when supplying liquid medium to the internal pipeline of the heating plate, low-temperature liquid medium is required, and at this time, the refrigerant can be used to circulate the liquid inside the pipeline.

[0063] In addition, a rotating structure can be installed on both sides of the rotating part, and the rotating structure is connected to the high-temperature control structure or the low-temperature control structure, so that the temperature control structure can be flipped. The rotating structure is, for example, a motor, which can make the temperature control structure as a whole, especially the heating plate, flip and turn upside down, that is, the heating plate that was originally placed upward can move inverted.

[0064] For some cases, no opening may be provided at the bottom of the reaction vessel, and when the residual material in the reaction vessel needs to be transferred, the stirring structure is first removed from the reactor, and then the reaction vessel is clamped by the clamping structure of the high temperature control structure and the low temperature control structure, that is, it plays a role of clamping and fixing, and then the clamping member on the support frame is released, and then the reaction vessel is moved to the corresponding position by the rotation action, that is, the rotation of the rotating member, and then turned over, so that the opening at the top of the reaction vessel is downward and the material is dumped into the recovery container, and then transferred to the original position for subsequent processes. Such a process is very practical for reaction vessels without bottom openings, especially for glass reaction vessels. In addition, the first heating plate and the second heating plate can be used for temperature control and can be used for clamping and turning movements, killing two birds with one stone.

[0065] Pipes are arranged on the inner wall of the interlayer of the first heating plate and the second heating plate of the high-temperature control structure and the low-temperature control structure, and a circulating medium is passed into the pipes. The liquid medium is passed into the pipes through external equipment such as a heating device or a refrigeration device. At the same time, two sets of independent pipes are arranged in the high-temperature control structure, namely, a main pipe and a sub-pipe. The main pipe occupies the main part, while the sub-pipe occupies a small part. The main pipe is used for heating, i.e., passing heat medium, while the sub-pipe can be selectively spliced ​​or connected with the cooling pipe in the low-temperature control structure to introduce low-temperature medium into the high-temperature control structure. Because in some cases, when the temperature in the reaction container is obviously higher than the set temperature, for example, when it exceeds 10°C, at this time, due to the insensitivity of temperature control, it is impossible to slightly adjust the problem of excessive temperature in time, so a cold medium can be passed, i.e., the reaction container is cooled by cooling the sub-pipe to maintain it within a reasonable temperature range.

[0066] In a further preferred embodiment, the inner layer pipelines of the first heating plate and the second heating plate of the high temperature control structure are arranged into multiple groups, and the multiple groups of pipelines are independently set, and the heights of different groups are located at different height positions, and then the two adjacent groups of pipelines are isolated by a removable plate, and the height direction of the first heating plate and the second heating plate is provided with multiple removable plates, and the removable plates are parallel to the bottom plate, that is, the removable plates are perpendicular to the sides of the heating plates in the accompanying drawings, and then when the two heating plates are close, the removable plates can be used for isolation. For different container heights or sizes, different capacities are selected, that is, the removable plates are removed or installed, so that structures of different capacities or depths can be obtained, and then used for heating control of the reaction container. At this time, only the wrapped pipelines of the reaction container need to be heated, and the pipeline groups below the removable plates at the bottom of the reaction container are heated differently, which can save energy.

[0067] In the accompanying drawings, the first heating plate 101 and the second heating plate 111 have a semicircular curved surface and a bottom plate, and the detachable plate is detachably connected at different height positions of the semicircular curved surface, and the detachable plate is parallel to the bottom plate, so that the pipeline groups at different heights can be arranged in isolation, and the heating medium of each pipeline group is independently controlled without interfering with each other.

Claims

1. A temperature-adjustable reactor for preparing ethylene carbonate, characterized in that: include: A reaction assembly, comprising a support frame, a clamping piece, a stirring structure and a reaction container, wherein the clamping piece is arranged in the middle of the support frame, and the top of the support frame is provided with a stirring structure, wherein the stirring structure comprises a stirring motor and a stirring rod; The temperature regulating assembly comprises a moving vehicle, a rotating part, a high temperature control structure and a low temperature control structure. The moving vehicle is provided with the rotating part, and the high temperature control structure and the low temperature control structure are provided on the rotating part. The high temperature control structure and the low temperature control structure are switched by the rotation of the rotating part. The high temperature control structure comprises a first clamping part. The first heating plate and the second heating plate of the first clamping part have electric heating wires or heating conduits therein, and the heating conduits have heat transfer oil therein. The low temperature control structure has a second clamping member, the first heating plate and the second heating plate of the second clamping member have cooling conduits in them, and the cooling conduits contain a refrigerant medium; The first clamping member and the second clamping member include a mounting plate, a driving motor, a driving sector tooth, a driven sector tooth, a first driving rod, a second driving rod, a first bending rod, a second bending rod, a first stabilizing rod and a second stabilizing rod, the first heating plate is arranged at the outer end of the first bending rod; the second heating plate is arranged at the outer end of the second bending rod; the driving motor is arranged at the bottom of the mounting plate, the driving motor is connected to the driving sector tooth, the driving sector tooth is meshed with the driven sector tooth, the driving sector tooth is connected to the first circular plate at the inner end of the first driving rod, the first circular plate is rotatably arranged on the mounting plate, the outer end of the first driving rod is hinged to the inner end of the first bending rod, the middle part of the first bending rod is hinged to the first stabilizing rod, and the inner end of the first stabilizing rod is hinged to the mounting plate; the first heating plate is arranged at the outer end of the first bending rod; The inner end of the second driving rod is on the second circular plate, the second circular plate is rotatably arranged on the mounting plate, the outer end of the second driving rod is hinged to the inner end of the second bending rod, the middle part of the second bending rod is hinged to the second stabilizing rod, and the inner end of the second stabilizing rod is hinged to the mounting plate; the outer end of the second bending rod is provided with the second heating plate, the first heating plate and the second heating plate constitute a heating unit; the first clamping member and the second clamping member have the same structure; Temperature control is performed by clamping the reaction container with the first clamping member or the second clamping member and adjusting the rotating member.

2. The temperature-adjustable reactor for preparing ethylene carbonate according to claim 1, characterized in that: The stirring structure further comprises an extension plate, the stirring motor is arranged on the upper side of the extension plate, the stirring motor is connected to the stirring rod, and the bottom of the stirring rod is detachably arranged in the reaction container; The reaction container has a plurality of feeding ports, each of which is provided with a sealing plug; The bottom of the reaction container is provided with a discharge port, and an outlet valve is arranged on the discharge port; It also includes a fraction collector, which has a collecting bottle, and the upper inlet of the collecting bottle is connected to the gas outlet of the reaction container through a condenser; the bottom of the collecting bottle is provided with a discharge port, which is connected to the feed port of the reaction container through a guide pipe, and the discharge port has a discharge valve.

3. A method for preparing ethylene carbonate using the temperature-adjustable ethylene carbonate preparation reactor according to claim 1, characterized in that: The following steps are included: S1, taking the reaction liquid of ethylene glycol and N'N-carbonyldiimidazole, filtering to obtain filtrate 1, adding imidazole powder, filtering again to obtain filtrate 2, adding hexamethyldisilazane to the filtrate 2, stirring, adding a catalyst and heating to obtain reaction liquid 2; S2: adding the reaction solution 2 into the reaction container, and then heating to 105°C, and maintaining reflux at 105°C for 5 hours to obtain an orange-red reaction solution. During the heating process, the high temperature control structure is used to heat the reaction container so that the temperature is maintained at 105°C; S3: After the reaction is finished, the high temperature control structure and the low temperature control structure are switched, and the high temperature control structure and the low temperature control structure are turned by the rotation of the rotating member, so that the second clamping member of the low temperature control structure is attached to the outer wall of the reaction container, and then the cooling is completed by the coolant medium in the cooling conduit; the temperature is maintained below 50°C; S4: rotating the first clamping member or the second clamping member to heat, distilling out the fraction N-trimethylsilimidazole, and then opening the opening at the bottom of the reaction container to discharge the residual reaction liquid in the reaction container; S5: Add the fraction N-trimethylsilyl imidazole into a reaction container, add triphosgene and dichloromethane into the reaction container and stir until dissolved to obtain Solution 2, wherein Solution 2 forms ethylene carbonate below 20°C; control the temperature of the reaction container by a cooling conduit in a low-temperature control structure to maintain the temperature below 20°C.

4. The method for preparing ethylene carbonate according to claim 3, characterized in that: The stirring motor drives the stirring rod so that the stirring rod stirs the reaction container, and the outlet valve at the bottom of the reaction container is controlled so that the discharge port selectively discharges the liquid in the reaction container; The reaction liquid in the reaction container collects fractions into a collection bottle by distillation, and the fractions in the collection bottle are reversely transferred to the reaction container through the discharge port.

5. The method for preparing ethylene carbonate according to claim 4, characterized in that: The driving motor provides power to rotate the driving sector teeth, and when the driving sector teeth rotate, the first driving rod drives the first bending rod to move, thereby causing the first heating plate to form a clamping action or an unfolding action. When the clamping action is implemented, the first heating plate is brought close to the reaction container to form temperature control; at the same time, the driving sector teeth drive the driven sector teeth to move, and the driven sector teeth cause the second driving rod and the second bending rod to move, thereby causing the second heating plate to approach or move away from the reaction container, thereby controlling the temperature of the reaction container; And through the rotation of the rotating part, the high temperature control structure and the low temperature control structure selectively control the temperature of the reaction container.

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