Backflow device for cyclization reaction

Abstract

The utility model provides a reflux device for cyclization reaction, which relates to the technical field of cyclization reaction, and comprises a condenser pipe, an auxiliary mechanism is arranged on the condenser pipe, the auxiliary mechanism comprises a round pipe, a connecting pipe is arranged in the round pipe, a fan is arranged at one end of the round pipe, a heat insulation plate is fixed on the outer wall of the round pipe, and the heat insulation plate is fixed on the outer wall of the round pipe. And semiconductor chilling plates are arranged on the front surface and the rear surface of the connecting pipe. According to the utility model, the auxiliary mechanism is arranged, so that the cyclization reaction reflux device has various condensation modes, and evaporated reactants can be condensed and refluxed timely and effectively in some cyclization reactions needing rapid condensation and reflux, thereby improving the reaction progress, reducing the time of the cyclization reaction and improving the yield of the cyclization reaction. Not only is the use effect of the cyclization reaction reflux device improved, but also the use efficiency of the cyclization reaction reflux device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cyclization reaction, in particular to a reflux device for cyclization reaction. Background Technique

[0002] Cyclization reaction refers to a chemical reaction in organic chemistry where two or more molecules form new chemical bonds to construct a cyclic structure. During the cyclization reaction process, reactants are usually evaporated. To reduce the loss of reactants, a reflux device is usually used to cool these evaporated reactants and let them flow back into the reaction system, thereby ensuring the yield of the cyclization reaction.

[0003] When the existing cyclization reaction reflux device is in use, although it can cool the evaporated reactants and let them flow back into the reaction system, its condensation method is relatively single. It simply uses the cooling water circulation to cool the evaporated reactants and let them flow back into the reaction system. In some cyclization reactions that require rapid condensation and reflux, this method may not be able to effectively cool and reflux the evaporated reactants in a timely manner, thus affecting the reaction process, that is, increasing the time of the cyclization reaction, reducing both the use effect and the use efficiency of the cyclization reaction reflux device. Content of the Utility Model

[0004] The purpose of the utility model is to solve the problem that when the existing cyclization reaction reflux device in the prior art is in use, its condensation method is relatively single. It simply uses the cooling water circulation to cool the evaporated reactants and let them flow back into the reaction system. In some cyclization reactions that require rapid condensation and reflux, it will not be able to effectively cool and reflux the evaporated reactants in a timely manner, thus affecting the reaction process, that is, increasing the time of the cyclization reaction, reducing both the use effect and the use efficiency of the cyclization reaction reflux device. Therefore, a reflux device for cyclization reaction is proposed.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: A reflux device for cyclization reaction, comprising: a condenser tube, and an auxiliary mechanism is arranged on the condenser tube;

[0006] The auxiliary mechanism includes a circular tube, a connecting tube is arranged inside the circular tube, a fan is installed at one end of the circular tube, a heat insulation plate is fixed on the outer wall of the circular tube, semiconductor refrigeration sheets are arranged on the front surface and the rear surface of the connecting tube, two relatively symmetrical hoop fasteners are arranged on the outer surfaces of the two semiconductor refrigeration sheets, and a controller is installed on the front surface of the heat insulation plate.

[0007] Preferably, both ends of the connecting pipe are fixedly penetrated through the inner wall of the circular pipe. The top of the connecting pipe is fixed to the bottom of the condensing pipe. The fan is electrically connected to the controller, and both of the semiconductor refrigeration chips are electrically connected to the controller.

[0008] Preferably, the four clamps are divided into two groups. Each group of clamps is installed by screws and nuts. The opposite surfaces of the two semiconductor refrigeration chips are respectively in contact with the front surface and the rear surface of the connecting pipe. The two semiconductor refrigeration chips and the two groups of clamps are all inside the circular pipe.

[0009] Preferably, a protection mechanism is arranged on the auxiliary mechanism. The protection mechanism includes a housing. Rectangular holes are respectively opened at positions close to the front surface on both sides of the inner wall of the housing. A round rod is fixed inside one of the rectangular holes.

[0010] Preferably, a rotating plate is rotatably connected to the outer surface of the round rod. Two symmetrically arranged rubber damping sleeves are movably sleeved on the outer surface of the round rod. A connecting block is fixed at a position close to the edge on the front surface of the rotating plate.

[0011] Preferably, the housing is fixed to the front surface of the heat insulation plate. The rear surface of the rotating plate is in contact with the inner wall surface of the other rectangular hole. The top of one of the rubber damping sleeves is in contact with the top of the inner wall of one of the rectangular holes.

[0012] Preferably, the bottom of one of the rubber damping sleeves is in contact with the top of the rotating plate. The top of the other rubber damping sleeve is in contact with the bottom of the rotating plate. The bottom of the other rubber damping sleeve is in contact with the bottom of the inner wall of one of the rectangular holes. The controller is inside the housing.

[0013] Compared with the prior art, the advantages and positive effects of the present utility model are as follows.

[0014] 1. In the present utility model, by arranging the auxiliary mechanism, the cyclization reaction reflux device can have multiple condensation methods, enabling it to timely and effectively condense and reflux the evaporated reactants in some cyclization reactions that require rapid condensation and reflux, thereby improving the reaction process, that is, reducing the time of the cyclization reaction, improving the use effect of the cyclization reaction reflux device, and at the same time improving the use efficiency of the cyclization reaction reflux device. By the cooperation of the clamp, the screw and the nut, the semiconductor refrigeration chip can be fixed on the connecting pipe. By the cooperation of the controller, the fan and the semiconductor refrigeration chip, the inside of the connecting pipe can be quickly cooled.

[0015] 2. In the present utility model, by providing a protection mechanism, the controller can be protected to prevent staff from accidentally touching it. Under the action of the rubber damping sleeve, the rotating plate can be prevented from rotating by itself. Under the action of the connecting block, it is convenient for staff to rotate the rotating plate. Description of the Drawings

[0016] Figure 1 FIG. is a perspective view of a ring-closing reaction reflux device proposed by the present utility model;

[0017] Figure 2 FIG. is a partial perspective view of a ring-closing reaction reflux device proposed by the present utility model;

[0018] Figure 3 FIG. is a partial perspective view of the auxiliary mechanism of a ring-closing reaction reflux device proposed by the present utility model;

[0019] Figure 4 FIG. is a partial perspective view of a ring-closing reaction reflux device proposed by the present utility model from another angle;

[0020] Figure 5 FIG. is a partial perspective view of the protection mechanism of a ring-closing reaction reflux device proposed by the present utility model.

[0021] Legend Explanation:

[0022] 1. Condenser; 2. Auxiliary mechanism; 201. Circular tube; 202. Connecting tube; 203. Fan; 204. Heat insulation plate; 205. Semiconductor refrigeration chip; 206. Hoop; 207. Controller; 3. Protection mechanism; 301. Housing; 302. Rectangular hole; 303. Round rod; 304. Rotating plate; 305. Rubber damping sleeve; 306. Connecting block. Detailed Embodiment

[0023] In order to more clearly understand the above-mentioned objects, features and advantages of the present utility model, the present utility model will be further described below with reference to the drawings and embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0024] In the following description, many specific details are set forth in order to fully understand the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Therefore, the present utility model is not limited by the specific embodiments disclosed in the following specification.

[0025] As Figures 1 - 5 shown, a ring-closing reaction reflux device includes: a condenser 1, and an auxiliary mechanism 2 is provided on the condenser 1;

[0026] The auxiliary mechanism 2 includes a round tube 201. A connecting tube 202 is arranged inside the round tube 201. One end of the round tube 201 is equipped with a fan 203. A heat insulation plate 204 is fixed on the outer wall of the round tube 201. Semiconductor refrigeration sheets 205 are arranged on both the front surface and the rear surface of the connecting tube 202. Two symmetrically arranged hoop fasteners 206 are arranged on the outer surfaces of the two semiconductor refrigeration sheets 205. A controller 207 is installed on the front surface of the heat insulation plate 204. Both ends of the connecting tube 202 are fixedly penetrated through the inner wall of the round tube 201. The top of the connecting tube 202 is fixed to the bottom of the condensation tube 1. The fan 203 is electrically connected to the controller 207. Both semiconductor refrigeration sheets 205 are electrically connected to the controller 207. The four hoop fasteners 206 are divided into two groups. Each group of hoop fasteners 206 is installed by screws and nuts. The opposite sides of the two semiconductor refrigeration sheets 205 are respectively in contact with the front surface and the rear surface of the connecting tube 202. The two semiconductor refrigeration sheets 205 and the two groups of hoop fasteners 206 are all inside the round tube 201. A protection mechanism 3 is arranged on the auxiliary mechanism 2. The protection mechanism 3 includes a housing 301. Rectangular holes 302 are opened at positions near the front surface on both sides of the inner wall of the housing 301. A round rod 303 is fixed inside one of the rectangular holes 302. A rotating plate 304 is rotatably connected to the outer surface of the round rod 303. Two symmetrically arranged rubber damping sleeves 305 are movably sleeved on the outer surface of the round rod 303. A connecting block 306 is fixed near the edge on the front surface of the rotating plate 304. The housing 301 is fixed on the front surface of the heat insulation plate 204. The rear surface of the rotating plate 304 is in contact with the inner wall surface of the other rectangular hole 302. The top of one of the rubber damping sleeves 305 is in contact with the top of the inner wall of one of the rectangular holes 302. The bottom of one of the rubber damping sleeves 305 is in contact with the top of the rotating plate 304. The top of the other rubber damping sleeve 305 is in contact with the bottom of the rotating plate 304. The bottom of the other rubber damping sleeve 305 is in contact with the bottom of the inner wall of one of the rectangular holes 302. The controller 207 is inside the housing 301.

[0027] The achieved effect is that when the reactor for the cyclization reaction needs to cool and reflux the evaporated reactants, first install the entire reflux device on the top reflux interface of the reactor through the prepared flange. Then, install the water inlet end and the water outlet end of the circulating cooling water to the water outlet end and the water inlet end of the condenser 1 respectively. At this time, the circulating cooling water will circulate inside the condenser 1 under the action of the started circulating cooling water connection device. Then, with the cooperation of the connecting block 306, rotate the rotating plate 304 with the round rod 303 as the rotation axis. At this time, the rotating rotating plate 304 will be separated from the inner wall of another rectangular hole 302. When the rotating plate 304 rotates to a certain angle (when the rotation of the rotating plate 304 is completed, it is convenient for the staff to use the controller 207), stop the rotation of the rotating plate 304. Then, connect the controller 207 to the external power supply. Then, use the controller 207 to start two semiconductor refrigeration chips 205 and the fan 203 at the same time. At this time, the started fan 203 will extract the air inside the round tube 201 and transport it to the environment. After that, with the cooperation of the connecting block 306, reset the rotating plate 304 back to its original position. At this time, the rotating plate 304 reset to its original position can stop rotating under the cooperation of the two rubber damping sleeves 305. Then, the cyclization reaction can be carried out using the reactor. When the reactant vapor enters the reflux device, the vapor entering the connecting pipe 202 will transfer a part of the heat to the wall of the connecting pipe 202. Then, under the action of the started semiconductor refrigeration chip 205, it will be transferred to the air between the connecting pipe 202 and the round tube 201. Then, under the action of the started fan 203, the air carrying heat between the connecting pipe 202 and the round tube 201 will be transported to the environment. When the vapor that has transferred a part of the heat enters the inside of the condenser 1, the remaining excess heat in the vapor can be transferred away under the action of the circulating condensed water. At this time, the vapor that has transferred away the heat will cool and turn into a liquid. Then, under the action of its own gravity, it will fall back into the inside of the reactor. When the cyclization reaction inside the reactor is completed, then perform the reverse operation according to the above operation steps. Use the controller 207 to turn off the fan 203 and the semiconductor refrigeration chip 205, and reset all the above components to their original positions.

[0028] Working principle: When the reactor for the cyclization reaction needs to cool and reflux the evaporated reactants, first install the entire reflux device on the top reflux interface of the reactor through the prepared flange. Then, install the water inlet end and the water outlet end of the circulating cooling water to the water outlet end and the water inlet end of the condenser 1 respectively. At this time, the circulating cooling water will circulate inside the condenser 1 under the action of the started circulating cooling water connection device. Then, with the cooperation of the connecting block 306, rotate the rotating plate 304 with the round rod 303 as the rotation axis. At this time, the rotating rotating plate 304 will separate from the inner wall of another rectangular hole 302. When the rotating plate 304 rotates to a certain angle (when the rotation of the rotating plate 304 is completed, it is convenient for the staff to use the controller 207), stop the rotation of the rotating plate 304 at this time. Then, connect the controller 207 to the external power supply, and then start two semiconductor refrigeration chips 205 and the fan 203 simultaneously by using the controller 207. At this time, the started fan 203 will extract the air inside the round tube 201 and transport it to the environment. After that, with the cooperation of the connecting block 306, reset the rotating plate 304 back to its original position. At this time, the rotating plate 304 reset to its original position can stop rotating under the cooperation of the two rubber damping sleeves 305. Then, the cyclization reaction can be carried out using the reactor. When the reactant vapor enters the reflux device, the vapor entering the connecting pipe 202 will transfer a part of the heat to the pipe wall of the connecting pipe 202. Then, under the action of the started semiconductor refrigeration chip 205, it is transferred to the air between the connecting pipe 202 and the round tube 201. Then, under the action of the started fan 203, the air carrying heat between the connecting pipe 202 and the round tube 201 is transported to the environment. When the vapor that has transferred a part of the heat enters the inside of the condenser 1, the remaining excess heat in the vapor can be transferred away under the action of the circulating condensed water. At this time, the vapor that has transferred the heat will cool and turn into a liquid, and then fall back into the inside of the reactor under its own gravity. When the cyclization reaction inside the reactor is completed, perform the reverse operation according to the above operation steps at this time. Use the controller 207 to turn off the fan 203 and the semiconductor refrigeration chip 205, and reset all the above components to their original positions.

[0029] Among them, the screw and the nut are common parts in real life.

[0030] Among them, the refrigerating end of the semiconductor refrigeration chip 205 is in contact with the surface of the connecting pipe 202. The semiconductor refrigeration chip 205 includes the following main components:

[0031] Semiconductor material: Generally composed of N-type and P-type semiconductors.

[0032] Electrode: Used to connect to the external power supply, usually made of metal materials.

[0033] Ceramic sheet: Used for insulation and support of semiconductor materials.

[0034] The working principle of the semiconductor refrigeration chip 205 is based on the Peltier effect. When direct current passes through an electric couple formed by two different semiconductor materials connected in series, heat can be absorbed and released at both ends of the electric couple respectively. Specifically, when the current flows from the N-type semiconductor to the P-type semiconductor, heat is absorbed, making this end cold and becoming the refrigerating end. When the current flows from the P-type semiconductor to the N-type semiconductor, heat is released, making this end hot and becoming the heating end. By continuously passing direct current, the refrigerating end continuously absorbs heat, thus achieving the refrigeration effect.

[0035] The controller 207 (PLC controller), the fan 203 and the semiconductor refrigeration chip 205 in the present utility model are all prior arts, and their working principles are all publicly known technologies. Their models can be selected according to actual situations and will not be explained in detail here.

[0036] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model in other forms. Any person skilled in the art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present utility model, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A reflux device for a ring-closure reaction, characterized in that: include: A condenser (1), wherein the condenser (1) is provided with an auxiliary mechanism (2); The auxiliary mechanism (2) comprises a circular tube (201), a connecting tube (202) is arranged inside the circular tube (201), a fan (203) is installed at one end of the circular tube (201), a heat insulation board (204) is fixed to the outer wall of the circular tube (201), a semiconductor cooling sheet (205) is arranged on the front surface of the connecting tube (202) and the rear surface of the connecting tube (202), two symmetrical clamps (206) are arranged on the outer surfaces of the two semiconductor cooling sheets (205), and a controller (207) is installed on the front surface of the heat insulation board (204).

2. A reflux device for ring-closure reaction according to claim 1, characterized in that: Both ends of the connecting tube (202) are fixedly connected to the inner wall of the circular tube (201); the top of the connecting tube (202) is fixed to the bottom of the condensing tube (1); the fan (203) is electrically connected to the controller (207); and the two semiconductor refrigeration plates (205) are electrically connected to the controller (207).

3. A reflux device for ring-closure reaction according to claim 1, characterized in that: The four clamps (206) are divided into two groups, and each group of the clamps (206) is installed by means of screws and nuts. The opposite sides of the two semiconductor cooling plates (205) are in contact with the front surface of the connecting tube (202) and the rear surface of the connecting tube (202), respectively. The two semiconductor cooling plates (205) and the two groups of clamps (206) are all located inside the circular tube (201).

4. A reflux device for cyclization reaction according to claim 1, characterized in that: The auxiliary mechanism (2) is provided with a protection mechanism (3), the protection mechanism (3) comprising a shell (301), rectangular holes (302) are provided on both sides of the inner wall of the shell (301) near the front surface, and a round rod (303) is fixed inside one of the rectangular holes (302).

5. A reflux device for cyclization reaction according to claim 4, characterized in that: The outer surface of the round rod (303) is rotatably connected to a rotating plate (304), the outer surface of the round rod (303) is movably sleeved with two symmetrical rubber damping sleeves (305), and a connecting block (306) is fixed on the front surface of the rotating plate (304) near the edge.

6. A reflux device for cyclization reaction according to claim 5, characterized in that: The shell (301) is fixed on the front surface of the heat insulation plate (204), the rear surface of the rotating plate (304) contacts the inner wall surface of another rectangular hole (302), and the top of one of the rubber damping sleeves (305) contacts the top of the inner wall of one of the rectangular holes (302).

7. A reflux device for cyclization reaction according to claim 5, characterized in that: The bottom of one of the rubber damping sleeves (305) contacts the top of the rotating plate (304), the top of another of the rubber damping sleeves (305) contacts the bottom of the rotating plate (304), the bottom of another of the rubber damping sleeves (305) contacts the bottom of the inner wall of one of the rectangular holes (302), and the controller (207) is located inside the housing (301).

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