Amination tubular reactor

Abstract

The utility model provides an amination tubular reactor. The amination tubular reactor comprises an outer cylinder; the inner cylinder is arranged in the outer cylinder, the outer cylinder is used for preserving heat of the inner cylinder, an inlet and an outlet for feeding and discharging raw materials are formed in the two ends of the inner cylinder respectively, the inlet is connected with an external heating and pressurizing system, and the heated and pressurized raw materials enter the inner cylinder through the inlet; the multiple layers of baffle components are arranged in the length direction of the inner cylinder at intervals, each layer of baffle component comprises baffle plates, and every two adjacent layers of baffle plates are different in arrangement, so that reactants entering the inner cylinder are fully mixed and reacted according to a preset flowing track when passing through each layer of baffle plate; and the multiple connecting rods penetrate through and fix the multiple layers of baffle components in the length direction of the inner cylinder, and the connecting rods are used for supporting and stabilizing each layer of baffle plate. The amination tubular reactor disclosed by the utility model solves the technical problems of side reaction and large occupied area of an integrated amination reactor in the related technology.

Description

Technical Field

[0001] The utility model relates to the technical field of NMP production equipment, in particular to an amination tubular reactor. Background Art

[0002] N-methylpyrrolidone (NMP) is a nitrogen heterocyclic compound with strong hygroscopicity and good solubility in polyimide resins. It is a non-toxic and harmless chemical raw material and is widely used in petrochemicals, pesticides, medicines, electronic materials and other fields.

[0003] Currently, NMP is primarily produced through the amination reaction of γ-butyrolactone (GBL) with monomethylamine. However, this reaction requires high temperature and pressure, which requires the reactor to remain at a high temperature for a long time. This can lead to side reactions within the reactor, affecting product quality and increasing the difficulty and cost of separation during the subsequent distillation process.

[0004] Existing NMP production reactors typically integrate heating, feeding, and reaction processes, with external casing or oil bath immersion. While this design meets the requirements for high-temperature reactions, it can also lead to side reactions within the reactor, severely impacting product purity and yield. Furthermore, the reactor's large size necessitates a significant footprint, making it a significant constraint on plant layout and equipment investment, particularly in large-scale industrial production.

[0005] Therefore, the prior art needs to be further developed. Utility Model Content

[0006] The purpose of the present invention is to overcome the above technical deficiencies and provide an amination tubular reactor to solve the technical problems in the related art of the existence of side reactions in the integrated amination reactor and the large area occupied by the reactor.

[0007] In order to achieve the above technical objectives, the utility model adopts the following technical solutions: provides an amination tubular reactor, including: an outer tube; an inner tube, the inner tube is arranged in the outer tube, the outer tube is used to keep the inner tube warm, and the two ends of the inner tube are respectively provided with an inlet and an outlet for raw materials to enter and exit, the inlet is connected to the external heating and pressurization system, and the raw materials that have been heated and pressurized enter the inner tube through the inlet; a multi-layer baffle component, each layer of the baffle component is arranged at intervals along the length direction of the inner tube, the baffle component includes baffles, and the arrangement of the two adjacent layers of baffles is different, so that the reactants entering the inner tube are fully mixed and reacted according to a predetermined flow trajectory when passing through each layer of baffles; a plurality of connecting rods, the plurality of connecting rods pass through and fix the multi-layer baffle component along the length direction of the inner tube, and the connecting rods are used to support and stabilize each layer of baffles.

[0008] Furthermore, the first layer of deflector in the deflector component is a first sieve plate, which is arranged close to the inlet. The first sieve plate has multiple circular through holes evenly distributed on it, which is used to filter particulate impurities in the raw material and generate turbulence and achieve preliminary mixing when the raw material passes through.

[0009] Furthermore, the second layer of baffles in the baffle component is located on the side of the first layer of baffles away from the inlet, and the second layer of baffles includes two semicircular baffles, which have a semicircular structure. The arc edges of the two semicircular baffles are respectively fixed on the inner wall of the inner cylinder, and the two semicircular baffles are staggered at symmetrical positions on the inner diameter of the inner cylinder, and a channel for the flow of reactants is formed between the two.

[0010] Furthermore, the third layer of baffles in the baffle component is a square plate baffle, the two opposite sides of the square plate baffle are arc-shaped sides, the two arc-shaped sides are respectively fixed on the inner wall of the inner tube, and the other two opposite sides of the square plate baffle are straight edges, which are used to guide the reactants to flow in the inner tube along both sides of the square plate baffle.

[0011] Furthermore, the center of the square plate baffle is located on the axis of the inner diameter of the inner tube and is arranged perpendicular to the length direction of the inner tube.

[0012] Furthermore, the fourth layer of baffles in the baffle component has the same structure as the second layer of baffles, and is used to further guide the reactants to flow along a predetermined trajectory and be fully mixed.

[0013] Furthermore, the fifth layer of baffles in the baffle component has the same structure as the third layer of baffles, and the fifth layer of baffles is arranged on the side of the fourth layer of baffles away from the inlet, for maintaining the stability of the reactant flow and improving the reaction efficiency.

[0014] Furthermore, the sixth deflector plate in the deflector component is the second sieve plate, which is arranged close to the outlet. The aperture of the circular through hole on the second sieve plate is smaller than the aperture of the circular through hole on the first sieve plate. The second sieve plate is used for secondary filtration of the reactants that are about to leave the inner cylinder.

[0015] Furthermore, a support plate is provided in the inner cylinder, which is located between the second sieve plate and the outlet. The support plate is used to fix and support multiple connecting rods. The support plate is a hollow structure so that the reactants can pass through the hollow part and flow to the outlet.

[0016] Furthermore, the deflecting components of two adjacent layers are arranged at equal distances.

[0017] Beneficial effects:

[0018] 1. The amination tubular reactor of the present invention adopts a double-layer structure design of an inner tube and an outer tube. The inner tube is used for reaction and the outer tube is used for heat preservation, which effectively reduces the side reactions caused by the reactor being in a high-temperature environment for a long time, thereby improving the purity and yield of the product; the setting of the multi-layer deflection component allows the reactants to be fully mixed during the flow process, improves the uniformity and conversion rate of the reaction, and further reduces the residue of unreacted products.

[0019] 2. The reactor adopts a tubular structure, and the inner tube guides the flow of reactants through multi-layer baffles. The structure is compact and the footprint is significantly reduced compared to traditional integrated reactors, making it suitable for large-scale industrial applications.

[0020] 3. The first layer of sieve plates creates turbulent flow and achieves preliminary mixing of the reactants through circular through-holes. The second layer of semicircular baffles and the third layer of square baffles, through staggered arrangement and guidance, form complex trajectories in the multi-layer flow of the reactants, improving the mixing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of the amination tubular reactor used in the embodiment of the present utility model;

[0022] Figure 2 This is a schematic structural diagram of the first sieve plate used in the embodiment of the present utility model;

[0023] Figure 3 This is a schematic structural diagram of a semicircular baffle plate used in an embodiment of the present utility model;

[0024] Figure 4 This is a schematic structural diagram of a square plate baffle used in an embodiment of the present utility model;

[0025] Figure 5 It is a schematic diagram of the flow path of reactants in the amination tubular reactor used in the embodiment of the present utility model.

[0026] The above drawings include the following reference numerals:

[0027] 1. Outer cylinder; 11. Cylinder cover; 12. Connecting pipe; 2. Inner cylinder; 21. Inlet; 22. Outlet; 3. Baffle; 31. First sieve plate; 32. Semicircular baffle; 33. Square baffle; 34. Second sieve plate; 4. Connecting rod; 5. Support plate. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0029] According to an embodiment of the present invention, an amination tubular reactor is provided. Figures 1 to 5 , including: an outer tube 1; an inner tube 2, the inner tube 2 is arranged in the outer tube 1, the outer tube 1 is used to keep the inner tube 2 warm, and the two ends of the inner tube 2 are respectively provided with an inlet 21 and an outlet 22 for the raw materials to enter and exit, the inlet 21 is connected to the external heating and pressurizing system, and the raw materials after heating and pressurizing enter the inner tube 2 through the inlet 21; a multi-layer baffle component 3, each layer of the baffle component 3 is spaced apart along the length direction of the inner tube 2, the baffle component 3 includes baffles, and the arrangement of the two adjacent layers of baffles is different, so that the reactants entering the inner tube 2 are fully mixed and reacted according to the predetermined flow trajectory when passing through each layer of baffles; a plurality of connecting rods 4, a plurality of connecting rods 4 pass through and fix the multi-layer baffle component 3 along the length direction of the inner tube 2, and the connecting rods 4 are used to support and stabilize each layer of baffles. Compared with the traditional structure that integrates heating, feeding and reaction, this tubular reactor is connected to the heating and pressurizing system, and the raw materials after heating and pressurizing enter the double-layer structure of the insulation tube for mixing and reaction. Since the flow of reactants is optimized by the deflection component 3 inside the reactor, on the one hand, the volume and floor space of the reactor can be reduced while ensuring the reaction efficiency; on the other hand, the reactor does not need to be immersed in a high-temperature oil bath for a long time, which not only greatly reduces the side reactions caused by the thermal reaction, but also protects the reactor and prolongs its service life. By passing through and fixing the multi-layer deflection components along the length direction of the inner tube with multiple connecting rods 4, the stability and firmness of each layer of deflectors can be ensured, thereby improving the stability and reliability of the entire reactor. The amination tubular reactor of this embodiment solves the technical problems of the related art that the integrated amination reactor has side reactions and the reactor occupies a large area.

[0030] See Figure 2In the amination tubular reactor of this embodiment, the first layer of baffles in the baffle component 3 is a first sieve plate 31. The first sieve plate 31 is arranged near the inlet 21. A plurality of circular through holes are evenly distributed on the first sieve plate 31, which are used to filter particulate impurities in the raw materials and to generate turbulence and achieve preliminary mixing when the raw materials pass through. The circular through holes on the first sieve plate 31 can effectively filter out particulate impurities in the raw materials, preventing these impurities from entering the interior of the reactor and affecting the reaction process or damaging the equipment. When the raw materials pass through the first sieve plate 31, the raw materials will produce a turbulent effect due to the presence of the through holes. This turbulence helps in the preliminary mixing of the raw materials in the reactor, so that the reactants are more evenly distributed in the reactor, providing more favorable conditions for the subsequent reaction process.

[0031] See Figure 3 In the amination tubular reactor of this embodiment, the second layer of baffles in the baffle component 3 is located on the side of the first layer of baffles away from the inlet 21, and the second layer of baffles includes two semicircular baffles 32, which are semicircular in structure. The arc-shaped edges of the two semicircular baffles 32 are respectively fixed on the inner wall of the inner cylinder 2, and the two semicircular baffles 32 are staggered at symmetrical positions of the inner diameter of the inner cylinder 2, and a channel for the flow of reactants is formed between the two. The two semicircular baffles 32 are staggered at symmetrical positions of the inner diameter of the inner cylinder 2 (that is, spaced apart) to form a specific channel for the flow of reactants. This design can guide the reactants to flow in the reactor according to a predetermined flow trajectory, so that the reactants are more fully mixed and reacted. At the same time, the two semicircular baffles 32 spaced apart and arranged at the same horizontal plane can also produce eddy and turbulent effects, further promoting the mixing and reaction of the reactants.

[0032] See Figure 4 In the amination tubular reactor of this embodiment, the third layer of baffles in the baffle component 3 is a square plate baffle 33. The two opposite sides of the square plate baffle 33 are curved edges, which are respectively fixed to the inner wall of the inner tube 2. The other two opposite sides of the square plate baffle 33 are straight edges, which are used to guide the reactants to flow along the two sides of the square plate baffle 33 in the inner tube 2. The two curved edges of the square plate baffle 33 are fixed to the inner wall of the inner tube, while the other two straight edges are used to guide the reactants to flow along the two sides of the inner tube. When the reactants flow through the square plate baffle 33, they will be blocked and the flow direction will be changed by the baffle, which helps to increase the collision and mixing opportunities between the reactants.

[0033] See Figure 4 In the amination tubular reactor of this embodiment, the center of the square plate baffle 33 is located on the axis of the inner diameter of the inner tube 2 and is arranged perpendicular to the length of the inner tube 2. The center of the square plate baffle 33 is located on the axis of the inner tube 2 and is perpendicular to the length of the inner tube 2. This ensures that the reactants are evenly distributed on both sides of the inner tube when flowing through the baffle.

[0034] See Figure 1 and Figure 3 In the amination tubular reactor of this embodiment, the fourth baffle in the baffle assembly 3 has the same structure as the second baffle, further guiding the reactants along a predetermined path and ensuring thorough mixing. The fourth baffle, like the second baffle, further guides the reactants along a predetermined path within the reactor. This guiding effect helps ensure uniform distribution of the reactants within the reactor.

[0035] See Figure 1 and Figure 4 In the amination tubular reactor of this embodiment, the fifth baffle in the baffle member 3 has the same structure as the third baffle. The fifth baffle is located on the side of the fourth baffle away from the inlet 21 to maintain the stability of the reactant flow and improve reaction efficiency. The presence of the fifth baffle further stabilizes the flow of the reactants within the reactor.

[0036] See Figure 1 In the amination tubular reactor of this embodiment, the sixth baffle in the baffle component 3 is the second sieve plate 34. The second sieve plate 34 is arranged near the outlet 22. The aperture of the circular through hole on the second sieve plate 34 is smaller than the aperture of the circular through hole on the first sieve plate 31. The second sieve plate 34 is used to perform secondary filtration on the reactants that are about to leave the inner tube 2. The second sieve plate 34 serves as the last filtration barrier in the reactor and can perform secondary filtration on the reactants that are about to leave the inner tube 2. Since the aperture of the second sieve plate 34 is smaller than that of the first sieve plate 31, it can more effectively intercept solid particles, impurities or incompletely reacted materials in the reactants, thereby ensuring the purity and quality of the final product.

[0037] See Figure 1 and Figure 5 In the amination tubular reactor of this embodiment, a support plate 5 is further provided in the inner barrel 2. The support plate 5 is located between the second sieve plate 34 and the outlet 22. The support plate 5 is used to secure and support the multiple connecting rods 4. The support plate 5 is a hollow structure, allowing reactants to pass through the hollows and flow toward the outlet 22. The provision of the support plate 5 significantly enhances the structural stability of the reactor inner barrel. The hollow structure of the support plate 5 helps optimize the flow of fluid within the reactor. The hollows serve as channels for fluid flow, reducing resistance within the reactor.

[0038] See Figure 1 and Figure 5 In the amination tubular reactor of this embodiment, the baffles 3 of two adjacent layers are equidistantly arranged. The equidistantly arranged baffles can ensure that the reactants flow evenly and stably in the reactor.

[0039] The present invention is a tubular reactor for the amination of NMP. Either the upper or lower portion of the reactor can serve as the raw material inlet. In this embodiment, the upper portion of the reactor serves as the raw material inlet. A cover 11 is provided at the end of the outer tube 1, and a connecting pipe 12 connected to the heating and pressurization system is installed on the cover 11. The reactor's compact reaction bed structure not only reduces the reactor size and footprint, reducing equipment and plant investment, but also, compared with conventional NMP production reactors, increases the actual reaction bed space, increasing the reaction space and fully utilizing the available reactor space, significantly improving single-bed output. The reactor's own reaction heat is fully utilized, reducing energy loss. The present invention utilizes an external heating and pressurization system, ensuring uniform heating of the materials, sufficient reaction, improved conversion, and high product quality. The reactor can also be connected to a DCS computer control system to control the temperature and pressure of the raw materials at the reactor inlet and monitor the stability of the reactor bed temperature, ensuring high reaction conversion and product quality, while maintaining a high degree of automation. Furthermore, the system enables continuous production, ensuring high output from the reaction bed.

[0040] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0041] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0042] The serial numbers of the above embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0043] In the above embodiments of the present application, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0044] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. An amination tubular reactor, characterized in that: include: outer cylinder(1); An inner cylinder (2), wherein the inner cylinder (2) is arranged in the outer cylinder (1), and the outer cylinder (1) is used to keep the inner cylinder (2) warm. An inlet (21) and an outlet (22) for the raw materials to enter and exit are respectively provided at both ends of the inner cylinder (2), and the inlet (21) is connected to an external heating and pressurizing system, and the heated and pressurized raw materials enter the interior of the inner cylinder (2) through the inlet (21); A multi-layer baffle component (3), each layer of the baffle component (3) being spaced apart along the length direction of the inner cylinder (2), the baffle component (3) comprising baffles, the arrangement of the baffles in two adjacent layers being different, so that reactants entering the inner cylinder (2) are fully mixed and reacted according to a predetermined flow trajectory when passing through each layer of baffles; A plurality of connecting rods (4) are provided, and the connecting rods (4) penetrate through and fix multiple layers of the deflection components (3) along the length direction of the inner tube (2). The connecting rods (4) are used to support and stabilize each layer of the deflection plate.

2. The amination tubular reactor according to claim 1, characterized in that The first layer of baffles in the baffle component (3) is a first sieve plate (31), which is arranged close to the inlet (21). The first sieve plate (31) has a plurality of circular through holes evenly distributed thereon, and is used to filter particulate impurities in the raw material and to generate turbulence and achieve preliminary mixing when the raw material passes through.

3. The amination tubular reactor according to claim 2, characterized in that The second layer of baffles in the baffle component (3) is located on a side of the first layer of baffles away from the inlet (21), and the second layer of baffles includes two semicircular baffles (32). The semicircular baffles (32) are semicircular in structure, and the arcuate edges of the two semicircular baffles (32) are respectively fixed on the inner wall of the inner cylinder (2). The two semicircular baffles (32) are staggered at symmetrical positions on the inner diameter of the inner cylinder (2), and a channel for the flow of reactants is formed between the two.

4. The amination tubular reactor according to claim 3, characterized in that The third layer of baffles in the baffle component (3) is a square plate baffle (33), two opposite sides of the square plate baffle (33) are arcuate sides, and the two arcuate sides are respectively fixed on the inner wall of the inner cylinder (2), and the other two opposite sides of the square plate baffle (33) are straight sides, which are used to guide the reactants to flow along the two sides of the square plate baffle (33) in the inner cylinder (2).

5. The amination tubular reactor according to claim 4, characterized in that The center of the square plate baffle (33) is located on the axis of the inner diameter of the inner cylinder (2) and is arranged perpendicular to the length direction of the inner cylinder (2).

6. The amination tubular reactor according to claim 5, characterized in that The fourth layer of baffles in the baffle component (3) has the same structure as the second layer of baffles, and is used to further guide the reactants to flow along a predetermined trajectory and to be fully mixed.

7. The amination tubular reactor according to claim 6, characterized in that The fifth baffle in the baffle component (3) has the same structure as the third baffle. The fifth baffle is arranged on the side of the fourth baffle away from the inlet (21) to maintain the stability of the reactant flow and improve the reaction efficiency.

8. The amination tubular reactor according to claim 7, characterized in that The sixth layer of baffles in the baffle component (3) is a second sieve plate (34). The second sieve plate (34) is arranged close to the outlet (22). The aperture of the circular through hole on the second sieve plate (34) is smaller than the aperture of the circular through hole on the first sieve plate (31). The second sieve plate (34) is used to perform secondary filtration on the reactants that are about to leave the inner cylinder (2).

9. The amination tubular reactor according to claim 8, characterized in that A support plate (5) is further provided in the inner cylinder (2), and the support plate (5) is located between the second sieve plate (34) and the outlet (22). The support plate (5) is used to fix and support the plurality of connecting rods (4); the support plate (5) is a hollow structure so that reactants pass through the hollow portion and flow toward the outlet (22).

10. The amination tubular reactor according to claim 1, characterized in that The deflection components (3) of two adjacent layers are arranged at equal distances.

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