Device and method for preparing dichlorooctafluorobutane

Abstract

The present invention belongs to the technical field of chemical production, and in particular relates to an apparatus and method for preparing dichlorooctafluorobutane, wherein the apparatus comprises: a preparation tower; an immersion mechanism, consisting of a transmission assembly and a hinge assembly, respectively used for immersion mixing of chlorine gas and controlling and driving the hinge assembly to move up and down, thereby achieving continuous introduction of chlorine gas into perfluorobutene; a cut-off assembly, used for cut-off of dichlorooctafluorobutane; and a fractionation assembly, arranged at the lower end of a fractionation chamber, used for alkali washing, drying, and rectification of dichlorooctafluorobutane. The transmission assembly is provided, utilizing a transmission cylinder and a lead screw to convert horizontal meshing transmission into vertical movement, and the lever structure in the hinge assembly is linked to increase the vertical movement amplitude of the lower end of the hinge assembly and reduce the movement duration. At the same time, the threaded transmission has a self-locking property, thereby improving the overall stability of the device.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical production, and in particular relates to equipment and a method for preparing dichlorooctafluorobutane. Background Art

[0002] Currently, dichlorooctafluorobutane is primarily produced through a multi-step reaction using 2,3-dichlorohexafluoro-2-butene or chlorotrifluoroethylene as raw materials. However, the yield is low, at only around 65%, and there are numerous byproducts, making subsequent purification and separation difficult. The current method for producing dichlorooctafluorobutane uses perfluorobutene as a raw material. This method involves gas-phase catalytic chlorination, which requires demanding reaction conditions. Catalyst preparation, loading, and reaction all require oxygen-free operation. The high reaction temperature also makes perfluorobutene susceptible to polymerization and carbon deposition, leading to catalyst failure.

[0003] Patent publication number CN108863709A discloses a liquid-phase photochlorination method for preparing dichlorooctafluorobutane. Under the action of photocatalysis, chlorine gas is continuously introduced into perfluorobutene to react. After the reaction, the dichlorooctafluorobutane product is obtained through alkali washing, drying, and distillation. This method has the advantages of a simple process, readily available raw materials, mild reaction conditions, high yield, and environmental friendliness.

[0004] The following problems still exist during the preparation of the above-mentioned equipment: Since the preparation of dichlorooctafluorobutane requires the introduction of chlorine gas into perfluorobutene to enable the reaction to proceed continuously, it is necessary to ensure that the chlorine gas fully contacts the perfluorobutene during dispersion to ensure the continuity and efficiency of the reaction. At the same time, it is necessary to solve the reflux phenomenon caused by the introduction of chlorine gas into the reaction, and the by-products are corrosive. It is necessary to ensure that the position of the chlorine gas introduction end can be quickly adjusted after the reaction is completed to ensure the safety of the device itself. Summary of the Invention

[0005] The present invention aims to provide an apparatus and method for preparing dichlorooctafluorobutane to solve the problems raised in the above-mentioned background technology. To achieve the above-mentioned object, the following technical solution is provided: an apparatus and method for preparing dichlorooctafluorobutane, comprising:

[0006] A preparation tower, the upper end of which is provided with a reaction chamber, and the lower end of which is provided with a fractionation chamber;

[0007] The immersion mechanism is composed of a transmission assembly and a hinge assembly. The hinge assembly is used to mix the chlorine immersion liquid, and the transmission assembly is used to drive the hinge assembly to move up and down to achieve continuous chlorine flow into perfluorobutylene.

[0008] The gas dispersion component is fixedly connected to the lower end of the hinge component and is used for dispersing chlorine gas;

[0009] An air inlet assembly is arranged between the left and right end walls of the reaction chamber and the air dispersion assembly;

[0010] A shutoff assembly is provided in the reaction chamber and the fractionation chamber and is used for shutting off dichlorooctafluorobutane;

[0011] The fractionation assembly is arranged at the lower end of the fractionation chamber and is used for alkali washing, drying and distillation of dichlorooctafluorobutane.

[0012] In the present technical solution, during the preparation of dichlorooctafluorobutane, sufficient chlorine gas must be introduced into perfluorobutene. First, a sufficient amount of perfluorobutene is injected into the reaction chamber. Then, the hinge assembly is driven downward by the transmission assembly until the reaction end is immersed in perfluorobutene. The air intake assembly is started to allow sufficient chlorine gas to enter the perfluorobutene. After the reaction is completed, the interception assembly is started to allow the product to enter the fractionation assembly in batches. Caustic soda is added to the fractionation assembly, and then the fractionation assembly heats and fractionates the mixture in the fractionation chamber to obtain pure dichlorooctafluorobutane.

[0013] In any of the above technical solutions, further, the transmission assembly includes:

[0014] The transmission box is fixedly arranged at the middle of the upper end surface of the preparation tower, and a transmission cavity is provided therein. The upper end wall of the transmission cavity is provided with a hole opened to the outside;

[0015] The positioning block is fixedly arranged at the middle of the lower end surface of the transmission cavity, and a horizontal circular groove is provided in the middle thereof, and the circular groove communicates with the transmission cavity and the reaction cavity;

[0016] The rotating ring block is rotated in the circular groove of the positioning block;

[0017] The transmission cylinder is fixedly connected to the middle part of the rotating ring block, with an internal thread groove in the middle and a gear ring fixed at the upper end of the outer ring end surface;

[0018] The lead screw is threadedly connected to the middle part of the transmission cylinder, and the upper end can extend from the opening at the upper end of the transmission cavity;

[0019] The transmission motor is fixedly arranged at the right end of the upper end surface of the transmission cavity, and its lower rotating end is fixedly connected to the driving gear, and the driving gear and the upper end gear ring of the transmission cylinder are engaged for transmission.

[0020] In this technical solution, when chlorine gas is introduced, the transmission motor is started, and the transmission motor drives the transmission cylinder to engage through the driving gear. The rotation of the transmission cylinder drives the rotating ring block and the transmission cylinder to rotate around the positioning block as a whole. As the transmission cylinder rotates, the internal threaded hole provided in the middle of the transmission cylinder and the lead screw are threadedly driven, driving the lead screw to move up and down; during the vertical movement of the lead screw, the lower end of the lead screw drives the hinge assembly to swing.

[0021] In any of the above technical solutions, further, the hinge assembly includes:

[0022] The horizontal plate is rotatably connected to the lower end of the lead screw, and four swing rods are hinged at the four corners of the left and right ends;

[0023] There are two positioning shafts, which are fixedly connected to the front and rear end walls of the reaction chamber in a horizontal direction;

[0024] The lever has four groups, and a through hole is provided in the middle part, through which it is rotatably connected to the positioning shaft;

[0025] The swing arm is fixedly welded to the lower end of the lever, and a movable pulley is provided at the lower end of the swing arm.

[0026] In this technical solution, when the lower end of the lead screw moves downward, the horizontal plate moves downward. In the process of the horizontal plate moving downward, the hinged rocker arm is driven to swing, and then the two levers are driven to swing in an arc around the positioning axis. When the lower ends of the levers swing toward each other, the end position of the rocker arm connected to the lower end of the lever swings in an arc in the vertical plane.

[0027] In any of the above technical solutions, further, the gas diffusion component includes:

[0028] The fixed frame has a rectangular cross section, with horizontal slide grooves opened at the front and rear ends respectively, and the movable pulley can roll horizontally in the horizontal slide grooves;

[0029] A connecting frame, comprising a plurality of groups, horizontally connected to the middle of the fixed frame;

[0030] The fan-shaped claw is fixedly connected to the lower end of the connecting frame, with a hollow center. The fan-shaped claw is provided with evenly distributed exhaust holes for dispersed spraying of chlorine gas.

[0031] The air pipe is fixedly connected to the upper end of the connecting frame, is hollow in the middle, and is communicated with the interior of the fan-shaped claw.

[0032] In this technical solution, when the lower end of the swing arm swings, it drives the four movable pulleys to swing. When the movable pulleys swing, a horizontal plane is formed by the four movable pulleys. The movable pulleys slide in the horizontal slide groove, and then drive the fixed frame, the connecting frame, and the fan-shaped claws to move downward as a whole until all the exhaust holes are immersed in perfluorobutylene.

[0033] In any of the above technical solutions, further, the interception component includes:

[0034] The intercepting block is fixedly arranged between the end walls of the reaction chamber and the fractionation chamber, and a intercepting chamber is fixedly arranged inside the intercepting block in an inverted T shape, and a through hole for connecting the reaction chamber and the fractionation chamber is provided at the left end;

[0035] A vertical annular groove is fixedly provided at the right end of the intercepting chamber, on which a rotating wheel is rotatably provided. The rotating wheel is disc-shaped and has an internal thread in the middle.

[0036] The threaded rod is threadedly connected to the middle of the runner, and the right end is fixedly connected to the valve, and the valve is interference-connected in the intercepting cavity.

[0037] The interception assembly also includes: an interception motor, which is fixedly arranged on the lower right end wall of the interception chamber, and a roller is fixedly arranged on its rotating end. The outer ring end surface of the rotor is in contact with the roller to drive the rotor to rotate to realize the opening and closing of the interception assembly.

[0038] In this technical solution, the shutoff motor is started to drive the entire rotor to rotate around the vertical annular groove, thereby driving the threaded rod and the middle thread of the rotor to perform threaded transmission, causing the shutoff chamber to move horizontally, thereby connecting the reaction chamber and the distillation chamber, allowing the dichlorooctafluorobutane in the reaction chamber to flow into the distillation chamber.

[0039] In any of the above technical solutions, further, the air intake assembly includes:

[0040] Gas nozzles, fixedly connected to the left and right end walls of the reaction chamber, are used to connect external chlorine gas;

[0041] The gas guide tube is connected between the gas nozzle and is used for transmitting chlorine gas during intake.

[0042] In the present technical solution, the distance between the gas nozzle and the gas pipe is relatively far, which avoids the backflow of the mixture of dichlorooctafluorobutane and perfluorobutene produced by the reaction when the gas pipe is conducting chlorine.

[0043] In any of the above technical solutions, further, the fractionation component includes:

[0044] The electric heating group is fixedly installed inside the lower end wall of the distillation chamber and is used to heat dichlorooctafluorobutane.

[0045] The fractionation tube is fixedly arranged at the left end of the fractionation chamber and is used to distill the dichlorooctafluorobutane heated by the electric heating group.

[0046] In this technical solution, the dichlorooctafluorobutane mixture is heated to release the excess chlorine therein first, and then the dichlorooctafluorobutane is vaporized by continuously heating the electric heating group, and then diverted through the distillation tube to finally obtain pure dichlorooctafluorobutane.

[0047] A method for using an apparatus for preparing dichlorooctafluorobutane comprises the following steps:

[0048] Step 1: Perfluorobutene is introduced into the reaction chamber, and then the transmission assembly is activated. The transmission assembly drives the hinge assembly downward, and the gas dispersion assembly connected to the lower end of the hinge assembly moves downward until the lower end of the gas dispersion assembly is immersed in the perfluorobutene;

[0049] Step 2: Chlorine is introduced from the air inlet assembly and released evenly from the exhaust hole through the air guide tube. At this time, perfluorobutene reacts with chlorine to form dichlorooctafluorobutane;

[0050] Step 3: Start the interception component to allow part of the dichlorooctafluorobutane to enter the fractionation chamber, then start the electric heating group to heat the dichlorooctafluorobutane liquid, and finally fractionate it through the fractionation tube to obtain the finished dichlorooctafluorobutane.

[0051] The beneficial effects of the present invention are as follows: when preparing dichlorooctafluorobutane, chlorine gas is continuously introduced into perfluorobutene for reaction, thereby continuously producing dichlorooctafluorobutane; and through the transmission assembly, the transmission cylinder and the lead screw are used to drive the horizontal meshing rotation into vertical movement, and the lever structure in the hinge assembly is linked to increase the vertical movement range of the lower end of the hinge assembly and shorten the movement time; at the same time, the threaded transmission in the transmission assembly has self-locking properties, thereby improving the overall stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a schematic diagram of the internal structure of the present invention;

[0053] Figure 2 It is a structural schematic diagram of the immersion mechanism in the present invention;

[0054] Figure 3 yes Figure 1 Schematic diagram of the AA position in the middle;

[0055] Figure 4 is a three-dimensional schematic diagram of the gas dispersion component of the present invention;

[0056] Figure 5 It is a structural schematic diagram of the interception component in the present invention.

[0057] The accompanying drawings are marked as follows: 100, preparation tower; 110, reaction chamber; 120, fractionation chamber; 200, immersion mechanism; 300, transmission assembly; 301, transmission box; 302, transmission chamber; 303, positioning block; 304, rotating ring block; 305, transmission cylinder; 306, lead screw; 307, transmission motor; 308, driving gear; 400, hinge assembly; 401, horizontal plate; 402, rocker; 403, positioning shaft; 404, lever; 405, rocker arm; 406, moving pulley ;500, gas dispersion component; 501, fixed frame; 502, horizontal slide; 503, connecting frame; 504, fan-shaped claw; 505, exhaust hole; 506, air connecting pipe; 600, air inlet component; 601, air nozzle; 602, air guide pipe; 700, interception component; 701, interception block; 702, interception chamber; 703, interception motor; 704, vertical ring groove; 705, runner; 706, threaded rod; 707, valve; 800, distillation component; 801, electric heating group; 802, distillation tube. DETAILED DESCRIPTION

[0058] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0059] In the description of this application, it should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the technologies, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0060] like Figure 1 As shown, this embodiment provides an apparatus and method for preparing dichlorooctafluorobutane, comprising:

[0061] The preparation tower 100 has a reaction chamber 110 at its upper end and a fractionation chamber 120 at its lower end;

[0062] The immersion mechanism 200 is composed of a transmission assembly 300 and a hinge assembly 400. The hinge assembly 400 is used to mix the chlorine immersion liquid, and the transmission assembly 300 is used to drive the hinge assembly 400 to move up and down to achieve continuous chlorine introduction into the perfluorobutylene.

[0063] The gas dispersion component 500 is fixedly connected to the lower end of the hinge component 400 and is used for dispersing chlorine gas;

[0064] The air inlet assembly 600 is disposed between the left and right end walls of the reaction chamber 110 and the air dispersion assembly 500;

[0065] The interception assembly 700 is provided in the reaction chamber 110 and the fractionation chamber 120 and is used for intercepting dichlorooctafluorobutane;

[0066] The fractionation assembly 800 is disposed at the lower end of the fractionation chamber 120 and is used for alkali washing, drying and distillation of dichlorooctafluorobutane.

[0067] In the present technical solution, during the preparation of dichlorooctafluorobutane, sufficient chlorine gas must be introduced into perfluorobutene. First, a sufficient amount of perfluorobutene is injected into the reaction chamber 110. Then, the hinge assembly 400 is driven downward by the transmission assembly 300 until the reaction end is immersed in the perfluorobutene. The air inlet assembly 600 is activated to introduce sufficient chlorine gas into the perfluorobutene. After the reaction is completed, the shut-off assembly 700 is activated to allow the product to enter the fractionation assembly 800 in batches. Caustic soda is added to the fractionation assembly 800, and then the fractionation assembly 800 heats and fractionates the mixture in the fractionation chamber 120 to obtain pure dichlorooctafluorobutane.

[0068] like Figure 2 As shown, specifically, the transmission assembly 300 includes:

[0069] The transmission box 301 is fixedly arranged at the middle of the upper end surface of the preparation tower 100, and a transmission cavity 302 is provided therein. The upper end wall of the transmission cavity 302 is provided with a hole opened to the outside;

[0070] The positioning block 303 is fixedly arranged at the middle of the lower end surface of the transmission cavity 302, and a horizontal circular groove is provided in the middle thereof, and the circular groove connects the transmission cavity 302 and the reaction chamber 110;

[0071] Rotate the ring block 304, which is rotatably set in the circular groove of the positioning block 303;

[0072] The transmission cylinder 305 is fixedly connected to the middle part of the rotating ring block 304, with an internal thread groove in the middle and a gear ring fixed at the upper end of the outer ring end surface;

[0073] The lead screw 306 is threadedly connected to the middle portion of the transmission cylinder 305, and the upper end thereof can extend from the opening at the upper end of the transmission cavity 302;

[0074] The transmission motor 307 is fixedly arranged at the right end of the upper end surface of the transmission cavity 302, and its lower rotating end is fixedly connected to the driving gear 308, and the driving gear 308 is meshed with the upper end gear ring of the transmission cylinder 305 for transmission.

[0075] In this technical solution, when chlorine gas is introduced, the transmission motor 307 is started, and the transmission motor 307 drives the transmission cylinder 305 to engage and transmit through the driving gear 308. The rotation of the transmission cylinder 305 drives the rotating ring block 304 and the transmission cylinder 305 to rotate around the positioning block 303 as a whole. When the transmission cylinder 305 rotates, the internal threaded hole provided in the middle thereof and the screw 306 are threadedly transmitted, driving the screw 306 to move up and down; during the vertical movement of the screw 306, the lower end of the screw 306 drives the hinge assembly 400 to swing.

[0076] like Figure 2 、 3 As shown, specifically, the hinge assembly 400 includes:

[0077] The horizontal plate 401 is rotatably connected to the lower end of the lead screw 306, and has four swing rods 402 hinged at the four corners of the left and right ends;

[0078] There are two positioning shafts 403, which are fixedly connected to the front and rear end walls of the reaction chamber 110 in a horizontal direction;

[0079] The lever 404 has four groups and a through hole in the middle, through which it is rotatably connected to the positioning shaft 403;

[0080] The swing arm 405 is fixedly welded to the lower end of the lever 404 and is provided with a movable pulley 406 at its lower end.

[0081] In this technical solution, when the lower end of the lead screw 306 moves downward, the horizontal plate 401 moves downward. In the process of the horizontal plate 401 moving downward, the hinged rocker arm 402 is driven to swing, and then the two levers 404 are driven to swing in an arc around the positioning axis 403. When the lower ends of the levers 404 swing toward each other, the end position of the rocker arm 405 connected to the lower end of the lever 404 swings in an arc in the vertical plane.

[0082] In a preferred embodiment of the present invention:

[0083] like Figure 3 、 4 As shown, specifically, the gas diffusion component 500 includes:

[0084] The fixed frame 501 has a rectangular cross-section, and horizontal slide grooves 502 are respectively opened at the front and rear ends, and the movable pulley 406 can roll horizontally in the horizontal slide grooves 502;

[0085] The connecting frame 503 has several groups and is horizontally connected to the middle of the fixing frame 501;

[0086] The fan-shaped claw 504 is fixedly connected to the lower end of the connecting frame 503, is hollow in the middle, and is provided with evenly distributed exhaust holes 505 for dispersed spraying of chlorine gas;

[0087] The air connection pipe 506 is fixedly connected to the upper end of the connection frame 503 , is hollow in the middle, and is in communication with the interior of the sector-shaped claw 504 .

[0088] In this technical solution, when the lower end of the swing arm 405 swings, the four movable pulleys 406 are driven to swing. When the movable pulleys 406 swing, a horizontal plane is formed by the four movable pulleys 406. The movable pulleys 406 slide in the horizontal slide groove 502, and then drive the fixing frame 501, the connecting frame 503, and the fan-shaped claw 504 to move downward as a whole until all the exhaust holes 505 are immersed in perfluorobutylene.

[0089] In a preferred embodiment of the present invention:

[0090] like Figure 5 As shown, specifically, the shut-off assembly 700 includes:

[0091] The intercepting block 701 is fixedly disposed between the end walls of the reaction chamber 110 and the fractionation chamber 120. A intercepting chamber 702 is fixedly disposed therein, which is in an inverted T-shape. A through hole is provided at the left end thereof, connecting the reaction chamber 110 and the fractionation chamber 120.

[0092] A vertical annular groove 704 is fixedly provided at the right end of the intercepting chamber 702, on which a rotating wheel 705 is rotatably provided. The rotating wheel 705 is disc-shaped and has an internal thread in the middle.

[0093] The threaded rod 706 is threadedly connected to the middle of the runner 705 , and the left end thereof is fixedly connected to the valve 707 , which is interference-fitted in the intercepting cavity 702 .

[0094] The shut-off assembly 700 also includes: a shut-off motor 703, which is fixedly arranged at the lower right end wall of the shut-off chamber 702, and a roller is fixedly provided at its rotating end. The outer ring end surface of the rotating wheel 705 is in contact with the roller, which is used to drive the rotating wheel 705 to rotate to realize the opening and closing of the shut-off assembly 700.

[0095] In this technical solution, by starting the shutoff motor 703, the rotor 705 is driven to rotate as a whole around the vertical annular groove 704, which in turn drives the threaded rod 706 and the middle thread of the rotor 705 to perform threaded transmission, causing the shutoff chamber 702 to move horizontally, thereby connecting the reaction chamber 110 and the distillation chamber 120, allowing the dichlorooctafluorobutane in the reaction chamber 110 to flow into the distillation chamber 120.

[0096] In a preferred embodiment of the present invention:

[0097] like Figure 1 As shown, specifically, the air intake assembly 600 includes:

[0098] Gas nozzles 601 are fixedly connected to the left and right end walls of the reaction chamber 110 for receiving external chlorine gas;

[0099] The air guide pipe 602 is connected between the gas nozzle 601 and the gas receiving pipe 506 and is used for transmitting chlorine gas during intake.

[0100] In this technical solution, the distance between the gas nozzle 601 and the gas connecting pipe 506 is relatively far, which prevents the mixture of dichlorooctafluorobutane and perfluorobutene produced by the reaction from being sucked back and flowing when the gas pipe 602 is conducting chlorine gas.

[0101] like Figure 1 As shown, specifically, the fractionation assembly 800 includes:

[0102] The electric heating group 801 is fixedly arranged inside the lower end wall of the distillation chamber 120 for heating dichlorooctafluorobutane. The distillation tube 802 is fixedly arranged at the left end of the distillation chamber 120 for distilling the dichlorooctafluorobutane heated at the electric heating group 801.

[0103] In this technical solution, the dichlorooctafluorobutane mixture is heated to release the excess chlorine therein first, and then the dichlorooctafluorobutane is vaporized by continuously heating the electric heating group 801, and then diverted through the distillation tube 802 to finally obtain pure dichlorooctafluorobutane.

[0104] Method for using the equipment for preparing dichlorooctafluorobutane:

[0105] Step 1: Perfluorobutene is introduced into the reaction chamber 110, and then the transmission assembly 300 is activated. The transmission assembly 300 drives the hinge assembly 400 downward, and the gas dispersion assembly 500 connected to the lower end of the hinge assembly 400 moves downward until the lower end of the gas dispersion assembly 500 is immersed in the perfluorobutene;

[0106] Step 2: Chlorine gas is introduced from the air inlet assembly 600 and released evenly from the exhaust hole 505 via the air guide pipe 602. At this time, perfluorobutene reacts with the chlorine gas to produce dichlorooctafluorobutane;

[0107] Step 3: Start the interception component 700 to allow some dichlorooctafluorobutane to enter the fractionation chamber 120, then start the electric heating group 801 to heat the dichlorooctafluorobutane liquid, and finally fractionate it through the fractionation pipe 802 to obtain the dichlorooctafluorobutane product.

[0108] The embodiments of the present application are described above in conjunction with the accompanying drawings. Unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. An apparatus for preparing dichlorooctafluorobutane, characterized in that: include: A preparation tower (100) is provided with a reaction chamber (110) at its upper end, and a fractionation chamber (120) is provided at its lower end; The immersion mechanism (200) is composed of a transmission assembly (300) and a hinge assembly (400), wherein the hinge assembly (400) is used for immersion mixing of chlorine gas, and the transmission assembly (300) is used for driving the hinge assembly (400) to move up and down, thereby achieving continuous introduction of chlorine gas into perfluorobutylene; A gas dispersion component (500) is fixedly connected to the lower end of the hinge component (400) and is used for dispersing chlorine gas; An air intake assembly (600) is arranged between the left and right end walls of the reaction chamber (110) and the air dispersion assembly (500); A shutoff assembly (700) is provided in the reaction chamber (110) and the fractionation chamber (120) and is used for shutting off dichlorooctafluorobutane; A fractionation assembly (800) is provided at the lower end of the fractionation chamber (120) and is used for alkali washing, drying and fractionation of dichlorooctafluorobutane; The transmission assembly (300) comprises: a transmission box (301) fixedly arranged at the middle of the upper end surface of the preparation tower (100), wherein a transmission cavity (302) is provided therein, and a hole is provided on the upper end wall of the transmission cavity (302) that is connected to the outside; A positioning block (303) is fixedly arranged at the middle of the lower end surface of the transmission cavity (302), and a horizontal circular groove is provided in the middle thereof, and the circular groove communicates with the transmission cavity (302) and the reaction cavity (110); Rotating the ring block (304) to be rotatably arranged in the circular groove of the positioning block (303); A transmission cylinder (305) is fixedly connected to the middle of the rotating ring block (304), wherein an internal thread groove is provided in the middle thereof and a gear ring is fixedly provided at the upper end of the outer ring end surface thereof; A lead screw (306) is threadedly connected to the middle portion of the transmission cylinder (305), and its upper end is capable of extending from the opening at the upper end of the transmission cavity (302); The transmission motor (307) is fixedly arranged at the right end of the upper end surface of the transmission cavity (302), and the lower rotating end of the transmission motor (307) is fixedly connected to the driving gear (308), and the driving gear (308) and the upper end gear ring of the transmission cylinder (305) are meshed for transmission; The hinge assembly (400) comprises: a horizontal plate (401) rotatably connected to the lower end of the lead screw (306), and four swing rods (402) hingedly provided at the four corners of the left and right ends; There are two positioning shafts (403) fixedly connected to the front and rear end walls of the reaction chamber (110) in a horizontal direction; The lever (404) has four groups, and a through hole is provided in the middle portion, and is rotatably connected to the positioning shaft (403) through the through hole; A swing arm (405) is fixedly welded to the lower end of the lever (404), and a movable pulley (406) is provided at the lower end thereof; The gas dispersion component (500) comprises: a fixed frame (501) having a rectangular frame cross section, with horizontal slide grooves (502) respectively provided at the front and rear ends, and the movable pulley (406) can roll horizontally in the horizontal slide grooves (502); A connecting frame (503) having a plurality of groups and horizontally connected to the middle of the fixing frame (501); The fan-shaped claw (504) is fixedly connected to the lower end of the connecting frame (503), and is hollow in the middle. The fan-shaped claw (504) is respectively provided with evenly distributed exhaust holes (505) for dispersing and spraying chlorine gas; The air connection pipe (506) is fixedly connected to the upper end of the connecting frame (503), is hollow in the middle, and is communicated with the interior of the fan-shaped claw (504).

2. The device for preparing dichlorooctafluorobutane according to claim 1, characterized in that: The intercepting assembly (700) comprises: an intercepting block (701) fixedly arranged between the end walls of the reaction chamber (110) and the fractionation chamber (120), an intercepting chamber (702) fixedly arranged inside the intercepting block, which is in an inverted T-shape, and a through hole for connecting the reaction chamber (110) and the fractionation chamber (120) at the left end; A vertical annular groove (704) is fixedly provided at the right end of the intercepting chamber (702), on which a rotating wheel (705) is rotatably provided. The rotating wheel (705) is in the shape of a disc and has an internal thread in the middle. The threaded rod (706) is threadedly connected to the middle of the rotating wheel (705), and the left end thereof is fixedly connected to the valve (707), and the valve (707) is interference-connected in the intercepting cavity (702).

3. The device for preparing dichlorooctafluorobutane according to claim 2, characterized in that: The intercepting assembly (700) further comprises: an intercepting motor (703) fixedly arranged at the lower right end wall of the intercepting chamber (702), a roller fixedly arranged at its rotating end, the outer ring end surface of the rotating wheel (705) being in contact with the roller, and being used to drive the rotating wheel (705) to rotate to realize the opening and closing of the intercepting assembly (700).

4. The device for preparing dichlorooctafluorobutane according to claim 1, characterized in that: The air inlet assembly (600) comprises: a gas nozzle (601) fixedly connected to the left and right end walls of the reaction chamber (110) for receiving external chlorine gas; The air guide pipe (602) is connected between the air nozzle (601) and the air receiving pipe (506) and is used for transmitting chlorine gas during intake.

5. The device for preparing dichlorooctafluorobutane according to claim 1, characterized in that: The fractionation assembly (800) comprises: an electric heating group (801) fixedly arranged inside the lower end wall of the fractionation chamber (120) for heating dichlorooctafluorobutane; and a fractionation tube (802) fixedly arranged at the left end of the fractionation chamber (120) for rectifying the dichlorooctafluorobutane heated by the electric heating group (801).

6. A method for using the device for preparing dichlorooctafluorobutane according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: step 1: introducing perfluorobutene into a reaction chamber (110), then starting a transmission component (300), the transmission component (300) starts to drive a hinge component (400) to move downward, and a gas dispersion component (500) connected to the lower end of the hinge component (400) moves downward until the lower end of the gas dispersion component (500) is immersed in the perfluorobutene; Step 2: Chlorine is introduced from the air inlet assembly (600) and released evenly from the exhaust hole (505) via the air guide tube (602). At this time, perfluorobutene reacts with the chlorine to form dichlorooctafluorobutane; Step 3: Start the interception component (700) to allow part of the dichlorooctafluorobutane to enter the fractionation chamber (120), then start the electric heating group (801), the electric heating group (801) heats the dichlorooctafluorobutane liquid, and finally fractionates it through the fractionation tube (802) to obtain the dichlorooctafluorobutane product.

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