A bromobutane synthesis reaction apparatus

Abstract

This utility model discloses a bromobutane synthesis reaction apparatus, relating to the field of bromobutane synthesis technology. The apparatus includes a metal outer shell, inside which is a corrosion-resistant inner liner. An annular cavity is formed between the inner liner and the metal outer shell. The upper end of the inner liner is connected to the upper end of the metal outer shell via a sealing assembly. This utility model, by using a fluorinated inner liner and a sealing structure, achieves complete isolation between the corrosive medium and the metal outer shell, fundamentally preventing HBr corrosion and improving the equipment's corrosion resistance, safety, and service life.

Description

Technical Field

[0001] This utility model relates to the field of bromobutane synthesis technology, and in particular to a bromobutane synthesis reaction apparatus. Background Technology

[0002] In fine chemical synthesis, 1,4-dibromobutane serves as an important organic synthesis intermediate, widely used in pharmaceuticals, pesticides, and functional materials. Its conventional preparation process typically involves the reaction of 1,4-butanediol with hydrobromic acid under heating conditions, which involves highly corrosive HBr gas and an acidic reaction system.

[0003] Traditional reaction equipment often uses metal reactors lined with glass, Hastelloy, or polytetrafluoroethylene. Although they have a certain degree of corrosion resistance, they still have many problems in long-term operation. On the one hand, metal materials are prone to electrochemical corrosion, pitting, or even stress cracking in the HBr environment, which can lead to equipment leakage and shortened lifespan. On the other hand, the sealing structure at the flange connection is simple, and acidic gases or liquids can easily penetrate into the metal shell along the gaps, causing local corrosion, resulting in safety hazards and high maintenance costs. In addition, once the integral corrosion-resistant structure is damaged, it often needs to be replaced as a whole, which is time-consuming and expensive. Utility Model Content

[0004] This invention provides a bromobutane synthesis reaction apparatus, including a metal shell, inside which is a corrosion-resistant inner liner. An annular cavity is formed between the inner liner and the metal shell, and the upper end of the inner liner is connected to the upper end of the metal shell by a sealing assembly.

[0005] Preferably, the sealing assembly includes an end plate one fixed to the upper end of the metal shell, with a sealing groove on the upper surface of the end plate one, and an end plate two provided at the upper end of the inner liner. Both the upper and lower sides of the end plate two are provided with annular protrusions, and the annular protrusion on the lower side is engaged in the sealing groove.

[0006] Preferably, a sealing gasket is provided in the sealing groove, and the sealing gasket fits against the annular protrusion.

[0007] Preferably, the upper end of the inner liner is provided with a cover plate, and the annular groove on the lower side of the cover plate engages with the annular protrusion on the upper side.

[0008] Preferably, a sealing ring is provided at the upper end of the metal shell, and the sealing ring is connected to the cover plate by bolts.

[0009] Preferably, the metal outer shell has an annular partition inside, which supports the inner liner, and the partition has several through holes.

[0010] Preferably, the lower part of the side wall of the metal shell is provided with a medium inlet and the upper part is provided with a medium outlet, and the medium inlet and the medium outlet are respectively connected to the annular cavity between the metal shell and the corrosion-resistant inner liner.

[0011] Preferably, the inner liner has a discharge pipe at the bottom center, the discharge pipe extends downward and passes through the discharge port at the bottom of the metal outer shell, and a valve is connected to the end of the discharge port.

[0012] Preferably, the cover plate is integrated with a feed inlet, a thermometer insertion port and a reflux port, and the top outer wall of the inner liner is symmetrically provided with lifting lugs. The lifting lugs are integrally molded with the inner liner and are used to cooperate with the lifting tool to realize the overall lifting and disassembly operation of the inner liner. The lower end of the agitator extends into the inner liner, and the upper end of the agitator passes through the cover plate and is connected to the output shaft of the motor.

[0013] Preferably, the outer wall of the metal casing is fitted with an insulation sleeve.

[0014] The present invention provides a bromobutane synthesis reaction apparatus, which, compared with the prior art, has the following advantages: 1. This utility model achieves complete isolation between corrosive media and metal support structure by setting the corrosion-resistant inner liner inside the metal shell and using a labyrinth-type sealing structure with annular protrusions and sealing grooves. During the reaction process, all acidic materials are sealed in the fluoropolymer inner liner, and the metal shell only undertakes the functions of structural support and heat transfer, without direct contact with corrosive substances. This fundamentally prevents HBr gas or liquid from penetrating into the metal parts along the flange connection, causing electrochemical corrosion and stress cracking, extending the overall service life of the equipment, and reducing the safety risks and maintenance costs caused by corrosion failure.

[0015] 2. This utility model uses a corrosion-resistant inner liner integrally molded from polytetrafluoroethylene, so that the parts of the reaction chamber that directly contact the highly corrosive media such as hydrobromic acid, 1,4-butanediol and by-products are entirely made of high-molecular fluorine materials. This effectively avoids the problems of equipment perforation, leakage and shortened lifespan caused by HBr corrosion in traditional metal reactors during bromination reactions, and improves the long-term operational reliability of the equipment under harsh operating conditions. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram showing the overall structure of an embodiment of the present utility model. Figure 3 This is a top view of the overall structure of an embodiment of the present utility model; Figure 4 The following is an embodiment of this utility model Figure 3 sectional view of the structure at point AA; Figure 5 This is a schematic diagram of the inner liner structure according to an embodiment of the present utility model; Figure 6 This is a schematic diagram of the metal shell structure of an embodiment of the present utility model; Figure 7 This is a cross-sectional schematic diagram of the metal shell structure according to an embodiment of the present utility model; Figure 8 This is a schematic diagram of the partition structure according to an embodiment of the present utility model.

[0018] Figure label: 1. Metal outer shell; 2. Partition plate; 3. Through hole; 4. Discharge port; 5. Medium inlet; 6. Medium outlet; 7. End plate one; 8. Sealing groove; 9. Sealing gasket; 10. Sealing ring sleeve; 11. Insulation sleeve; 12. Inner liner; 13. End plate two; 14. Annular protrusion; 15. Lifting lug; 16. Cover plate; 17. Agitator; 18. Feed inlet; 19. Thermometer insertion port. Detailed Implementation

[0019] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0020] Please refer to Figures 1-8 This utility model provides a bromobutane synthesis reaction apparatus, including a metal shell 1 and a corrosion-resistant inner liner 12 disposed inside the metal shell 1.

[0021] The metal outer shell 1 is made of carbon steel or stainless steel and is used to provide overall structural support. It forms an annular cavity between itself and the inner liner 12. The annular cavity is used to circulate heat-conducting or cooling water to achieve heating or cooling control of the reaction materials.

[0022] The corrosion-resistant inner liner 12 is integrally molded from polytetrafluoroethylene or perfluoroalkoxy resin material. Its inner wall is in direct contact with the reactants and has excellent acid and corrosion resistance, effectively resisting the chemical erosion of hydrobromic acid and by-products.

[0023] like Figure 4As shown, the upper end of the inner liner 12 extends to form an end plate 2 13. The upper and lower sides of the end plate 2 13 are respectively provided with annular protrusions 14. The upper end of the metal shell 1 is fixed with an end plate 1 7. The upper surface of the end plate 1 7 is provided with a sealing groove 8 that matches the lower annular protrusion 14. The lower annular protrusion 14 is embedded in the sealing groove 8 to achieve the initial positioning and sealing fit between the inner liner 12 and the metal shell 1.

[0024] The sealing groove 8 is also provided with an elastic sealing gasket 9, which is made of fluororubber or polytetrafluoroethylene. Its inner edge is tightly fitted with the annular protrusion 14, forming the first static seal under the compressed state to prevent corrosive gases or liquids from seeping out along the connection surface.

[0025] A cover plate 16 is provided above the end plate 2 13. An annular groove is provided on the lower side of the cover plate 16. The annular groove engages with the annular protrusion 14 on the upper side of the end plate 2 13 to achieve axial positioning and sealing connection between the cover plate 16 and the inner liner 12.

[0026] The cover plate 16 is equipped with a feed inlet 18, a thermometer insertion port 19, and a reflux port (unlabeled), which are used for material addition, temperature monitoring, and gas reflux during the reaction process.

[0027] The upper end of the metal casing 1 is also provided with a sealing ring 10. The sealing ring 10 is sleeved on the outside of the cover plate 16. The sealing ring 10, the cover plate 16 and the end plate 7 are pressed and fixed by multiple bolts, so that the entire sealing assembly is in a pre-tightened state, further enhancing the sealing reliability and preventing leakage due to pressure fluctuations during operation.

[0028] like Figure 7 As shown, in order to support the weight of the inner liner 12 and ensure its stable installation inside the metal shell 1, an annular partition 2 is provided inside the metal shell 1. The partition 2 is fixed to the side wall of the metal shell 1, and its inner edge is supported on the bottom of the outer wall of the inner liner 12. Multiple through holes 3 are evenly opened on the partition 2 to allow the heat transfer medium to flow freely in the annular cavity and ensure heat exchange uniformity.

[0029] The metal casing 1 has a medium inlet 5 at the lower part of its side wall and a medium outlet 6 at the upper part. The medium inlet 5 and the medium outlet 6 are respectively connected to the annular cavity for connection to an external heat conduction system.

[0030] After the reaction is complete, the product is discharged through the discharge pipe located at the center of the bottom of the inner liner 12. The discharge pipe extends downward and passes through the discharge port 4 at the bottom of the metal outer shell 1. The end of the discharge port 4 is connected to a stop valve or a ball valve to control the discharge.

[0031] To facilitate maintenance and replacement, two lifting lugs 15 are symmetrically arranged on the top outer wall of the inner liner 12. The lifting lugs 15 and the inner liner 12 are integrally molded structures, which can be used with lifting tools to achieve the overall disassembly and assembly of the inner liner 12.

[0032] The lower end of the stirring shaft of the stirrer 17 extends into the inner liner 12, and the upper end passes through the cover plate 16 and is connected to the output shaft of the external motor. It is used to drive the stirring blades to achieve uniform mixing of the reaction materials. The upper end of the stirrer 17 is rotatably connected to the cover plate 16.

[0033] Finally, in order to reduce heat loss and improve thermal efficiency, the outer wall of the metal shell 1 is fitted with an insulation sleeve 11, which is made of rock wool or aluminum silicate fiber material and is fixed to the surface of the shell by clamps or straps.

[0034] In summary, 1,4-butanediol and hydrobromic acid are added to the corrosion-resistant inner liner 12 through the feed inlet 18. The external heat conduction system introduces heating medium into the annular cavity through the medium inlet 5 and the medium outlet 6 to raise the temperature to the reaction temperature. The stirrer 17 is then activated to ensure that the materials are fully mixed and react to generate 1,4-dibromobutane. After the reaction is complete, the discharge port 4 valve is opened to discharge the product. During maintenance, the bolts are removed, and the inner liner 12 is lifted out as a whole through the lifting lugs 15 for cleaning or replacement.

[0035] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A bromobutane synthesis reaction apparatus, characterized in that: It includes a metal shell (1), and a corrosion-resistant inner liner (12) is provided inside the metal shell (1). An annular cavity is formed between the inner liner (12) and the metal shell (1). The upper end of the inner liner (12) is connected to the upper end of the metal shell (1) through a sealing assembly.

2. The bromobutane synthesis reaction apparatus according to claim 1, characterized in that: The sealing assembly includes an end plate 1 (7) fixed to the upper end of the metal shell (1), a sealing groove (8) is provided on the upper surface of the end plate 1 (7), and an end plate 2 (13) is provided at the upper end of the inner liner (12). Both the upper and lower sides of the end plate 2 (13) are provided with annular protrusions (14), and the annular protrusion (14) located on the lower side is engaged in the sealing groove (8).

3. The bromobutane synthesis reaction apparatus according to claim 2, characterized in that: A sealing gasket (9) is provided inside the sealing groove (8), and the sealing gasket (9) is in contact with the annular protrusion (14).

4. The bromobutane synthesis reaction apparatus according to claim 3, characterized in that: The inner liner (12) is provided with a cover plate (16) at the upper end, and the annular groove on the lower side of the cover plate (16) is engaged with the annular protrusion (14) on the upper side.

5. The bromobutane synthesis reaction apparatus according to claim 4, characterized in that: The upper end of the metal shell (1) is provided with a sealing ring (10), and the sealing ring (10) is connected to the cover plate (16) by bolts.

6. The bromobutane synthesis reaction apparatus according to claim 5, characterized in that: The metal outer shell (1) has an annular partition (2) inside, which is used to support the inner liner (12). The partition (2) has several through holes (3).

7. The bromobutane synthesis reaction apparatus according to claim 6, characterized in that: The metal shell (1) has a medium inlet (5) at the lower part of its side wall and a medium outlet (6) at the upper part. The medium inlet (5) and the medium outlet (6) are respectively connected to the annular cavity between the metal shell (1) and the corrosion-resistant inner liner (12).

8. The bromobutane synthesis reaction apparatus according to claim 1, characterized in that: The inner liner (12) has a discharge pipe at the bottom center, which extends downward and passes through the discharge port (4) at the bottom of the metal shell (1). The end of the discharge port (4) is connected to a valve.

9. The bromobutane synthesis reaction apparatus according to claim 4, characterized in that: The cover plate (16) is integrated with a feed inlet (18), a thermometer insertion port (19) and a return port. The top outer wall of the inner liner (12) is symmetrically provided with lifting lugs (15). The lifting lugs (15) and the inner liner (12) are integrally molded and used to cooperate with the lifting tool to realize the overall lifting and disassembly operation of the inner liner (12). The lower end of the agitator (17) extends into the inner liner (12), and the upper end of the agitator (17) passes through the cover plate (16) and is connected to the output shaft of the motor.

10. The bromobutane synthesis reaction apparatus according to claim 9, characterized in that: The outer wall of the metal shell (1) is fitted with an insulation sleeve (11).

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