Preparation device of trifluoroacetamide
The design of the split cooling assembly solves the problems of long cooling time and difficult cleaning of existing reactor/tank cooling structures, enabling rapid assembly and disassembly and efficient heat exchange, reducing operating costs and improving maintenance efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-05
- Publication Date
- 2026-03-27
AI Technical Summary
The existing cooling structure of the reactor/tank is time-consuming and difficult to dismantle. The cooling water pipes are difficult to clean after scaling, resulting in high cost and low efficiency.
It adopts a split cooling assembly, which includes a cylindrical body composed of a first ring, a second ring, and multiple fins. The medium inlet and outlet pipes are connected by threads. Combined with the retaining ring and clamping plate structure, it can achieve quick assembly and disassembly and efficient heat exchange.
It improves the ease of installation and disassembly of the cooling assembly, reduces the difficulty of cleaning scale buildup, enhances maintenance and heat exchange efficiency, and reduces operating costs.
Smart Images
Figure CN224040921U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of preparation devices of trifluoroacetamide. BACKGROUND
[0002] Trifluoroacetamide is a kind of fluorine-containing organic compound, with unique chemical properties, important application in medicine, pesticide, material science and other fields. Trifluoroacetamide is usually prepared with trifluoroacetic acid (CF3COOH) or its derivatives as raw material, through amidation reaction. Such as can be realized by trifluoroacetic acid and ammonia / ammonium reaction, principle is that trifluoroacetic acid and ammonia (or amine) occur neutralization reaction under appropriate conditions, generate trifluoroacetamide. Reaction formula is: CF3COOH+NH3→CF3CONH2+H2O;Process implementation needs to be carried out in solvent (such as anhydrous methanol, dichloromethane), ammonia is introduced to saturation, reaction temperature needs to be controlled at 0-50 ℃.
[0003] The cooling structure of the existing reaction kettle / reactor is usually realized by installing spiral winding cold water pipeline on the outer wall of the kettle / tank. Therefore, the cooling structure arranged on the kettle / tank is gradually connected and installed in the production process of the whole reaction device. Because the cooling water pipe winding path is relatively long, it takes a lot of time in the process of connecting and assembling. In addition, once the cooling water pipe is connected and fixed, it is not easy to remove. Once the inner wall of the pipe cavity is scaled, it is not easy to handle. If the scaling is too serious, the whole reaction kettle / tank has to be disassembled, and then the cooling pipe is gradually disassembled from the kettle body / tank body for cleaning. The loss cost, time cost and other costs of the whole cleaning process are relatively high. UTILITY MODEL CONTENTS
[0004] In order to overcome the above technical problems, the utility model provides a kind of preparation device of trifluoroacetamide, and the cooling assembly arranged therein can realize good cooling and temperature control during the preparation process of trifluoroacetamide, and has the advantages of convenient assembly and disassembly, which helps to reduce the difficulty of scaling and cleaning, improve the operation efficiency and reduce the operating loss.
[0005] The technical scheme adopted by the utility model to solve its technical problems is: a kind of preparation device of trifluoroacetamide, including reaction kettle and cooling assembly. Medium inlet pipe and medium outlet pipe are arranged on the wall of the reaction kettle. Cold medium can be sent into the interior of the reaction kettle through the medium inlet pipe to cool the internal solution. The medium after heat exchange is discharged to the outside of the reaction kettle through the medium outlet pipe and enters the heat exchange medium circulation system. After heat exchange and cooling, the medium is sent to the interior of the reaction kettle again by the power system through the medium inlet pipe, and the cycle is repeated.
[0006] The cooling assembly further comprises a cylindrical body composed of the first ring body, the second ring body and a plurality of fin plates.
[0007] The first ring body is detachably fixed at the upper port of the reaction tank. An annular cavity I is formed on the wall of the first ring body, and a socket I is formed on the side wall of the first ring body and communicated with the annular cavity I, and the medium feeding pipe is connected with the socket I.
[0008] The second ring body is detachably fixed at the lower part of the tank cavity of the reaction tank. An annular cavity II is formed on the wall of the second ring body, and a socket II is formed on the side wall of the second ring body and communicated with the annular cavity II, and the medium discharge pipe is connected with the socket II.
[0009] The plurality of fin plates are distributed in the circumferential direction and arranged in the vertical direction, and the upper end of the fin plate is communicated with the annular cavity I, and the lower end is communicated with the annular cavity II.
[0010] Optionally, an annular tapered surface is formed at the middle of the side wall of the first ring body, and a plurality of convex columns extending vertically downward are distributed in the middle of the annular tapered surface, and the convex columns are distributed in the circumferential direction; correspondingly, a tapered counterbore is formed below the upper port of the reaction tank, and a socket is formed on the side wall of the tapered counterbore and matched with the convex column one by one.
[0011] Optionally, the socket I comprises a sink and an annular flange arranged in the sink, the end face of the annular flange is inwardly contracted relative to the port of the sink, and an external threaded surface is formed on the outer wall of the annular flange. The medium feeding pipe extends into the sink and can be fixedly connected with the annular flange in a threaded structure.
[0012] Optionally, a plurality of sockets II are distributed on the side wall of the second ring body. The socket II comprises a counterbore and an annular flange arranged in the counterbore, the end face of the annular flange is inwardly contracted relative to the port of the counterbore, and an external threaded surface is formed on the outer wall of the annular flange. The medium discharge pipe extends into the counterbore and can be fixedly connected with the annular flange in a threaded structure.
[0013] Optionally, the cooling assembly further comprises at least one pair of binding rings, and the pair of binding rings are stacked in the vertical direction.
[0014] A plurality of clamping plates extending in the radial direction are arranged on the inner wall of the binding ring and distributed in the circumferential direction. V-shaped notched portions are formed at both ends of the clamping plate in the circumferential direction. An axial through hole in the vertical direction is formed on the plate body of the clamping plate.
[0015] The fin plate passes between the two opposite V-shaped notched portions respectively, and the outer wall of the fin plate can form a profile contact matching relationship with the inner wall of the V-shaped notched portion. Each through hole arranged on the pair of two binding rings is opposite in the vertical direction and is provided with a bolt assembly to fix the two binding rings together, and can cause the V-shaped notched portion to press on the outer wall of the fin plate.
[0016] Optionally, the cooling assembly further comprises at least one pair of bundle rings, and the pair of bundle rings are stacked alternately in up and down directions.
[0017] A plurality of clamping plates extending in a radial direction are distributed on the inner wall of the bundle ring, and the plurality of clamping plates are distributed in a circumferential direction. Notched portions are formed at both ends of the clamping plate in a circumferential direction. An axial through hole extending in a vertical direction is formed on the plate body of the clamping plate.
[0018] The fin plate passes through the two notched portions respectively, and the outer wall of the fin plate is in a profile contact matching relationship with the inner wall of the notched portion. The through holes provided on the pair of bundle rings are opposite to each other in up and down directions, and a bolt assembly is arranged in the through holes to fix the two bundle rings together, and the notched portions are pressed on the outer wall of the fin plate.
[0019] Optionally, a resilient layer is fixed on the V-shaped notched portion or the inner wall of the notched portion.
[0020] The beneficial effects of the present application are as follows: the preparation device of trifluoroacetamide disclosed by the present application is provided with a cooling assembly with a split assembly structure in a reaction tank, which can realize good heat exchange purpose, ensure heat exchange efficiency, significantly reduce the difficulty of cleaning operation, improve the maintenance efficiency of the cooling assembly, and reduce the operation and maintenance cost. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 It is a partial cross-sectional structure schematic view of the present application.
[0022] Figure 2 It is a structure schematic view of the fin plate.
[0023] Figure 3 It is a top view structure schematic view of the fin plate.
[0024] Figure 4 It is a corresponding Figure 1 It is a transverse cross-sectional structure schematic view of the first ring body at A-A.
[0025] Figure 5 It is a top view structure schematic view of the cooling assembly.
[0026] Figure 6 It is a transverse cross-sectional structure schematic view of the second ring body.
[0027] Figure 7 It is a top view structure schematic view of the matching of the bundle ring and the fin plate.
[0028] Figure 8 It is a Figure 7 It is a partial enlarged structure schematic view at I. It is a partial enlarged structure schematic view at I.
[0029] In the figure: 10 Reaction vessel; 20 First ring body, 21 Annular cavity one, 22 Insertion port one, 23 Annular conical surface, 231 Protrusion, 24 Protrusion; 30 Second ring body, 31 Annular cavity two, 32 Insertion port two, 321 Countersunk hole, 322 Annular flange; 40 Fin plate; 50 Bundle fixing ring, 51 Clamping plate, 52 V-shaped notch, 53 Multi-stage through hole. Detailed Implementation
[0030] The structures, proportions, and sizes shown in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, terms such as "upper," "lower," "front," "rear," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.
[0031] like Figures 1 to 8 The apparatus shown is for the preparation of trifluoroacetamide, including a reaction vessel 10 and a cooling assembly. The cooling assembly's medium source, power system, etc., are all located outside the reaction vessel 10, and the heat exchange medium (such as cooling water) circulates through a medium inlet pipe and a medium outlet pipe provided on the wall of the reaction vessel 10. Since the foregoing can be implemented with reference to existing spiral-wound cold water pipe type heat exchange assemblies, it will not be described in detail.
[0032] In the technical solution of this application, the cooling assembly further includes a cylindrical body composed of a first ring body 20, a second ring body 30 and a plurality of hollow fins 40, which replaces the spiral cold water pipe structure of the prior art for heat exchange.
[0033] The first ring body 20 is fixedly disposed at the upper port of the reaction vessel 10. An annular cavity 21 is formed on the wall of the first ring body 20, and a socket 22 communicating with the annular cavity 21 is formed on the side wall of the first ring body 20. The medium inlet pipe is connected to the socket 22, allowing cold medium to be introduced into the annular cavity 21. A protrusion 24 is formed on the upper part of the first ring body 20, with the upper end of the protrusion 24 contracting inward / downward relative to the upper port of the reaction vessel 10. The socket 22 is at least partially formed on the protrusion 24. The protrusion 24 helps to reduce the axial thickness of the body of the first ring body 20.
[0034] SeeFigure 6 The socket 22 can comprise a sink groove and a ring flange arranged in the sink groove, the end face of the ring flange is inwardly retracted relative to the end port of the sink groove, and an external threaded surface is formed on the outer wall of the ring flange; the end of the medium feeding pipe is provided with a connecting head which extends into the sink groove and is fixedly connected with the ring flange in a threaded structure.
[0035] The second ring body 30 is fixedly arranged at the lower part of the tank cavity of the reaction tank 10, is located above the tank body, and is vertically spaced apart by a certain size. An annular cavity two 31 is formed on the wall body of the second ring body 30, and a socket two 32 which communicates with the annular cavity two 31 is formed on the side wall of the second ring body 30. The medium discharge pipe is connected with the socket two 32, so that the cold medium (whose temperature has relatively increased) after heat exchange with the solution can be discharged from the annular cavity two 31 to the outside of the tank body and enter the external circulation system.
[0036] A plurality of fin plates 40 are distributed in the circumferential direction and arranged in the vertical direction. The upper end of each fin plate 40 communicates with the annular cavity one 21, and the lower end of each fin plate 40 communicates with the annular cavity two 31. In this way, the cold medium with a relatively low temperature can be distributed from the annular cavity one 21 to the hole cavities of each fin plate 40, so as to promote heat exchange between the cold medium and the solution in the tank cavity during the flow of the cold medium in the fin plate 40. The cold medium with a relatively increased temperature can finally be sent to the outside of the tank cavity through the medium discharge pipe after converging in the annular cavity two 31 from each fin plate 40, and re-enters the external circulation system of the cooling assembly.
[0037] An annular taper surface 23 is formed at the middle part of the side wall of the first ring body 20, a plurality of convex columns 231 which extend vertically downward are distributed and formed at the middle part of the annular taper surface 23, and the convex columns 231 are distributed in the circumferential direction; the large diameter end of the annular taper surface 23 faces upward. Correspondingly, a taper sink hole is formed below the upper port of the reaction tank 10, and a socket which corresponds to each convex column 231 is formed on the side wall of the taper sink hole; the flared end of the taper sink hole faces upward. The upper end of each fin plate 40 is fixedly connected to the lower end face of the first ring body 20 and communicates with the annular cavity one 21; at the same time, the lower end of each fin plate 40 is fixedly connected to the upper end face of the second ring body 30 and communicates with the annular cavity two 31.
[0038] The first ring body 20 extends into the upper part of the tank cavity of the reaction tank 10, the annular taper surface 23 is in contact with the side wall of the taper counterbore, and the convex column 231 is inserted into the insertion hole, so as to limit the first ring body 20 at the upper end of the reaction tank 10, and finally fixed by bolts. The connection relationship between the annular taper surface 23 and the taper counterbore and the convex column 231 and the insertion hole can form reliable and effective support for the first ring body 20 (or the cylindrical body), and has good torsional resistance, which helps to ensure that the upper part of the first ring body 20 (or the cylindrical body) and the reaction tank 10 form reliable and firm connection, effectively prevent the situation of falling downward and relative rotation, and effectively avoid the situation that the cylindrical body and the reaction tank 10 may collide.
[0039] As shown in Figure 6 The second ring body 30 is fixed at the lower part of the tank cavity of the reaction tank 10. As shown in the drawings, a plurality of insertion holes two 32 are distributed on the side wall of the second ring body 30. The insertion hole two 32 includes a counterbore 321 and an annular flange 322 arranged in the counterbore 321, so that the end face of the annular flange 322 is inwardly retracted relative to the end port of the counterbore 321, and an external thread surface is formed on the outer wall of the annular flange 322. The end of the medium discharge pipe is provided with a connecting head, and the connecting head can extend into the counterbore 321 and be fixedly connected with the annular flange 322 in a threaded structure. The second ring body 30 is fixed at the lower part of the tank cavity of the reaction tank 10 through a plurality of insertion holes two 32, which can create some convenience for the lower part of the cylindrical body, and improve the disassembly efficiency.
[0040] The connecting head includes an outer tube and an inner tube arranged coaxially, and the inner tube can rotate relative to the outer tube and communicate with the lumen of the medium feeding pipe / the lumen of the medium discharge pipe. The outer tube can move along the axis of the tank body of the reaction tank 10, so as to selectively insert and remove the end of the outer tube into and out of the counterbore 321 / sink groove. The inner tube is connected with the annular flange 322 / annular flange through a threaded structure.
[0041] In order to improve the force condition between the solution and the fin plate 40, and reduce the strength of the liquid flow on the fin plate 40 when the solution is stirred. As Figures 1 to 3As shown, the cross section of the fin plate 40 is (relatively narrow) elliptical, and the outer diameter of the fin plate 40 gradually decreases from the central position of the length direction to the two ends, so that the fin plate 40 as a whole becomes fusiform. As shown, the outer diameter of the central position of the fin plate 40 is d2, and the outer diameter of the two end tips is d1, d1 is greater than d2, and the difference is controlled within 5mm. By arranging the fin plate 40 in a fusiform structure, the impact of the solution on the fin plate 40 in the up-down convection flow in the vertical direction can be weakened. By arranging the cross section of the fin plate 40 as an elliptical curved surface, the torsional impact of the solution on the fin plate 40 when the solution rotates can be weakened, and the convection of the solution is helpful.
[0042] As shown in Figure 7 , Figure 8 The cooling assembly further comprises at least one pair of clamping rings 50, and the pair of clamping rings 50 are stacked alternately in the up-down direction. A plurality of clamping plates 51 extending in the radial direction are arranged on the inner wall of the clamping ring 50, and the plurality of clamping plates 51 are arranged alternately around the circumference. V-shaped notched portions 52 are formed at both ends of the clamping plate 51 in the circumferential direction. A plurality of axial through holes 53 in the vertical direction are formed on the plate body of the clamping plate 51.
[0043] The fin plate 40 passes between the two V-shaped notched portions 52 opposite to each other, and the outer wall of the fin plate 40 can be in a profile contact matching relationship with the inner wall of the V-shaped notched portion 52. Each of the plurality of axial through holes 53 arranged on the pair of clamping rings 50 is opposite to each other in the up-down direction and is provided with a bolt assembly / stud assembly to fix the two clamping rings 50 together (tensioned in the vertical direction) and can cause the V-shaped notched portion 52 to press on the outer wall of the fin plate 40. An elastic layer is fixedly arranged on the inner wall of the V-shaped notched portion 52. Further, the purpose of connecting the middle part of the plurality of fin plates 40 as a whole by the clamping ring 50 is achieved, and the ability of the middle part of the fin plate 40 to bear the load is strengthened, which can effectively inhibit the vibration intensity of the fin plate 40 caused by the flow of the solution. In particular, after the elastic layer is arranged on the inner wall of the V-shaped notched portion 52, the clamping ring 50 can not only enhance the firmness of the fixation of each fin plate 40, but also play a role in shock absorption, further improve the stress condition of the fin plate 40, and ensure that the service life is long.
[0044] At least one pair of clamping rings 50 needs to be arranged near the central position of the length direction of the fin plate 40. If only one pair of clamping rings 50 is arranged, the pair of clamping rings 50 is arranged at the central position of the length direction of the fin plate 40. At this time, the circumferential spacing between the two V-shaped notched portions 52 opposite to each other on the clamping ring 50 is less than the outer diameter d2 of the central position of the fin plate 40 (see Figure 2), the two binding rings 50 are installed on each fin plate 40 from top to bottom and from bottom to top and approach each other, until the two binding rings 50 are moved to the vicinity of the lengthwise central position of the fin plate 40, the V-shaped notch part 52 on the binding ring 50 gradually approaches and contacts the outer wall of the fin plate 40. When the two binding rings 50 are connected together by the bolt assembly arranged at each multi-stage through hole 53, the two binding rings 50 are pulled to approach each other (and approach the lengthwise central position of the fin plate 40) in the vertical direction, the V-shaped notch part 52 is pressed to the outer wall of the fin plate 40, and finally the middle part of the plurality of fin plates 40 is connected into a whole through the binding ring 50, the load bearing capacity of the middle part of the fin plate 40 is improved, and the resistance to liquid flow impact is improved. The end of the multi-stage through hole 53 can accommodate the end of the bolt and the nut, which is beneficial to the appearance and can reduce the adverse effects of liquid flow impact on the firmness of the bolt assembly.
[0045] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. The present application can be improved in many aspects without departing from the general idea, and those skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical idea of the present application should be covered by the claims of the present application.
Claims
1. A device for preparing trifluoroacetamide, comprising a reaction tank (10) and a cooling assembly; a medium feeding pipe and a medium discharging pipe are arranged on the wall of the reaction tank (10); characterized in that: The cooling assembly comprises a cylindrical body composed of a first ring body (20), a second ring body (30) and a plurality of hollow fins (40); The first ring body (20) is detachably fixed at the upper port of the reaction tank (10); an annular cavity I (21) is formed on the first ring body (20), and a socket I (22) in communication with the annular cavity I (21) is formed on the side wall, and a medium inlet pipe is connected to the socket I (22); The second ring body (30) is detachably fixed at the lower part of the tank cavity of the reaction tank (10); an annular cavity II (31) is formed on the second ring body (30), and a socket II (32) in communication with the annular cavity II (31) is formed on the side wall, and a medium outlet pipe is connected to the socket II (32); The plurality of fins (40) are distributed in the circumferential direction and arranged in the vertical direction, and the upper end of the fin (40) is in communication with the annular cavity I (21), and the lower end is in communication with the annular cavity II (31).
2. The apparatus for the preparation of trifluoroacetamides according to claim 1, characterized in that: An annular taper (23) is formed at the middle of the side wall of the first ring body (20), and a plurality of convex columns (231) extending vertically downward are distributed at the middle of the annular taper (23), and the convex columns (231) are distributed in the circumferential direction; a taper counterbore is formed on the inside of the upper port of the reaction tank (10), and a socket corresponding to the convex column (231) is formed on the side wall of the taper counterbore.
3. The apparatus for the preparation of trifluoroacetamides according to claim 1, characterized in that: The socket I (22) comprises a sink and a ring-shaped flange arranged in the sink, the end face of the ring-shaped flange is inwardly contracted relative to the port of the sink, and an external thread surface is formed on the outer wall of the ring-shaped flange; the medium inlet pipe extends into the sink and can be fixedly connected with the ring-shaped flange in a threaded structure.
4. The apparatus for the preparation of trifluoroacetamides according to claim 1, characterized in that: A plurality of sockets II (32) are distributed on the side wall of the second ring body (30); the socket II (32) comprises a counterbore (321) and a ring-shaped flange (322) arranged in the counterbore (321), the end face of the ring-shaped flange (322) is inwardly contracted relative to the port of the counterbore (321), and an external thread surface is formed on the outer wall of the ring-shaped flange (322); the medium outlet pipe extends into the counterbore (321) and can be fixedly connected with the ring-shaped flange (322) in a threaded structure.
5. The apparatus for the preparation of trifluoroacetamides according to any one of claims 1 to 4, characterized in that: The cross section of the fin (40) is oval, and the outer diameter gradually decreases from the central position of the fin (40) to both ends.
6. The apparatus for the preparation of trifluoroacetamides according to claim 5, characterized in that: The cooling assembly further comprises at least one pair of binding rings (50), and the pair of binding rings (50) are stacked in the vertical direction; A plurality of clamping plates (51) extending in the radial direction are arranged on the inner wall of the binding ring (50), and the plurality of clamping plates (51) are distributed in the circumferential direction; V-shaped notches (52) are formed at both ends of the clamping plate (51) in the circumferential direction; an axial through hole in the vertical direction is formed on the plate body of the clamping plate (51); The fin plate (40) passes through the two opposite V-shaped recesses (52) respectively, and the outer wall of the fin plate (40) can be in a profile contact matching relationship with the inner wall of the V-shaped recess (52); each through hole arranged on the pair of two binding rings (50) is opposite in up and down directions and is provided with a bolt assembly, so as to fix the two binding rings (50) together and enable the V-shaped recess (52) to press on the outer wall of the fin plate (40).
7. The apparatus for the preparation of trifluoroacetamides according to claim 6, characterized in that: An elastic layer is fixedly arranged on the inner wall of the V-shaped recess (52).
8. The apparatus for the preparation of trifluoroacetamides according to claim 1, characterized in that: The cooling assembly further comprises at least one pair of binding rings (50), so that the pair of binding rings (50) are stacked in an up and down direction; A plurality of clamping plates (51) extending in a radial direction are arranged on the inner wall of the binding ring (50) and are distributed in a circumferential direction; recesses are formed at both ends of the clamping plate (51) in a circumferential direction; an axial through hole extending in a vertical direction is formed on the plate body of the clamping plate (51); The fin plate (40) passes through the two opposite recesses respectively, and the outer wall of the fin plate (40) can be in a profile contact matching relationship with the inner wall of the recess; each through hole arranged on the pair of two binding rings (50) is opposite in up and down directions and is provided with a bolt assembly, so as to fix the two binding rings (50) together and enable the recess to press on the outer wall of the fin plate (40).
9. The apparatus for the preparation of trifluoroacetamides according to claim 8, characterized in that: An elastic layer is fixedly arranged on the inner wall of the recess. An elastic layer is fixedly arranged on the inner wall of the recess.