Plug flow dynamic tubular reactor

Abstract

The utility model discloses a plug flow dynamic tubular reactor and belongs to the technical field of tubular reactors. The plug flow dynamic tubular reactor is vertically placed, and comprises at least one group of reaction cylinder assemblies and at least one group of heat exchange assemblies, and further comprises a discharging cylinder assembly and a stirring assembly, the reaction cylinder assemblies and the heat exchange assemblies are alternately communicated in series from bottom to top, the discharging cylinder assembly is located above the uppermost heat exchange assembly and communicated with the uppermost heat exchange assembly, and the stirring assembly is arranged in the reaction cylinder assemblies, the heat exchange assemblies and the discharging cylinder assembly in a penetrating mode. The reactor consists of a plurality of groups of reaction cylinder assemblies and heat exchange assemblies which are alternately communicated in series and have a heat exchange function, so that the reactor has very strong heat exchange capability, the risks of explosion and the like caused by over-high temperature in the reactor are reduced, and the reactor is suitable for reaction with large heat release; meanwhile, the reactor is small in backmixing and can realize plug flow continuous reaction.

Description

Technical Field

[0001] This utility model relates to the field of tubular reactor technology, specifically to a plug flow dynamic tubular reactor. Background Technology

[0002] Currently, the most commonly used reactors in the chemical industry are dynamic tubular reactors. Due to their inherent structure, dynamic tubular reactors are typically only suitable for reactions with low exothermic activity, slow reaction rates, and relatively mild processes. However, with the optimization of chemical processes, high-throughput, violently exothermic reactions are gradually increasing, making dynamic tubular reactors unsuitable for current chemical processes. Furthermore, the structural limitations of dynamic tubular reactors also prevent them from achieving large-scale push-through and minimal backmixing effects, resulting in severe backmixing within the reactor. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a plug flow dynamic tubular reactor with strong heat exchange capacity and low backmixing.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A plug flow dynamic tubular reactor, placed vertically, includes:

[0006] At least one set of reaction cylinder assembly and at least one set of heat exchange assembly, wherein the reaction cylinder assembly and the heat exchange assembly are alternately connected in series from bottom to top;

[0007] The discharge cylinder assembly is located above and connected to the uppermost heat exchange assembly;

[0008] A stirring assembly is disposed throughout the reaction cylinder assembly, the heat exchange assembly, and the discharge cylinder assembly.

[0009] Preferably, both the reaction cylinder assembly and the discharge cylinder assembly include an inner cylinder. At least one feed pipe is provided on the outer wall of the inner cylinder of the reaction cylinder assembly located at the lowest point, and at least one discharge pipe is provided on the outer wall of the inner cylinder of the discharge cylinder assembly. The feed pipe and the discharge pipe are respectively connected to the corresponding inner cylinder.

[0010] Preferably, both the reaction cylinder assembly and the discharge cylinder assembly include a jacket sleeved on the outer layer of the inner cylinder, forming a heat exchange cavity between the jacket and the inner cylinder, and the outer wall of the jacket is provided with a heat exchange medium inlet pipe and a heat exchange medium outlet pipe that communicate with the heat exchange cavity.

[0011] Preferably, at least one instrument connector is provided on the outer wall of the inner cylinder of at least one of the reaction cylinder assembly and / or discharge cylinder assembly, and the instrument connector is respectively connected to the corresponding inner cylinder.

[0012] Preferably, the heat exchange assembly is a shell-and-tube heat exchanger without end caps at both ends, and the tube side of the heat exchange assembly is connected to the adjacent reaction cylinder assembly and discharge cylinder assembly. The outer wall of the shell side of the heat exchange assembly is provided with a heat exchange medium inlet pipe and a heat exchange medium outlet pipe that are connected to the shell side.

[0013] Preferably, the stirring assembly includes a stirring shaft and a plurality of stirrers arranged axially on the stirring shaft. The stirring shaft passes through the center of the reaction cylinder assembly, the heat exchange assembly, and the discharge cylinder assembly axially. The plurality of stirrers are respectively arranged inside the reaction cylinder assembly and the discharge cylinder assembly.

[0014] Preferably, the agitator is a paddle, toothed, or turbine agitator.

[0015] Preferably, the heat exchange assembly has a through hole at its center for the stirring shaft to pass through, and the through hole is circumferentially closed.

[0016] Preferably, the reactor also includes a lower reactor head and an upper reactor head, which are respectively sealed to the lowermost reaction cylinder assembly and the uppermost discharge cylinder assembly.

[0017] Preferably, adjacent reaction cylinder assemblies and heat exchange assemblies are connected by flanges, and discharge cylinder assemblies and heat exchange assemblies are connected by flanges.

[0018] The beneficial effects of this utility model are as follows:

[0019] (1) The dynamic tubular reactor of the present invention is composed of several sets of alternating series-connected reaction cylinder components and heat exchange components. Both the reaction cylinder components and the heat exchange components have heat exchange functions, which makes the reactor have a strong heat exchange capacity and reduces the risk of explosion caused by excessive temperature in the reactor. It is suitable for reactions with large heat release. At the same time, during the use of the reactor, the reactants are continuously fed from the feed pipe and the reaction products are continuously discharged from the discharge pipe, realizing continuous flow production. After the reactants enter the reaction cylinder from the feed pipe, they are quickly and evenly mixed by the agitator, which improves the mass transfer efficiency. The high mass and heat transfer efficiency can reduce the residence time of the reactants in the reactor, improve production efficiency, and ensure safe production.

[0020] (2) The dynamic tubular reactor of the present invention provides a push flow reactor in which the reactants are pushed from bottom to top along the axial direction during the reaction process. The heat exchange components not only serve as heat exchange units, but also as unidirectional throttling elements between stages, which greatly reduces the back mixing of materials and is suitable for chemical reactions with extremely high back mixing requirements.

[0021] (3) The plug flow dynamic tubular reactor provided by this utility model can be equipped with feed pipes on multiple reaction cylinder components. The reactants can be continuously fed into the reaction cylinder components through one or more feed pipes. Different reactants can be added according to the different order of material addition and reaction order in the reaction process, so as to obtain the final product through multiple stages of different reactions. At the same time, since multiple reaction cylinder components are set at intervals through heat exchange components, and temperature gauges, pressure gauges, etc. can be connected through the instrument pipes of the reaction cylinder components to realize the monitoring of reaction parameters, thereby realizing segmented precise temperature control and realizing different stages of reaction under different temperature conditions in one reactor.

[0022] (4) The dynamic tubular reactor of the present invention provides a push flow reactor, which can be connected to a thermometer, a pressure gauge, etc. through the instrument pipe of the reaction cylinder assembly. It can monitor the reaction process parameters in real time, control the product quality, and further improve the safety of the reaction. For example, when the temperature is too high, the temperature or flow rate of the heat exchange medium can be adjusted in time to cool down.

[0023] (5) The dynamic tubular reactor of the present invention provides a reaction zone located in the reaction cylinder assembly and the heat exchange assembly. Since the liquid holding capacity of the reaction cylinder assembly is small, the area of ​​the reactant subjected to the shear force of the stirrer is small, which is suitable for chemical reactions that are sensitive to shear.

[0024] (6) The dynamic tubular reactor of the present invention can be set with different stages of reaction cylinder components and heat exchange components according to different reaction requirements to meet different liquid holding capacity and heat release requirements. Attached Figure Description

[0025] To clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of the reactor in Embodiment 1 of this utility model;

[0027] Figure 2 This is a top view of the reaction cylinder assembly in Embodiment 1 of this utility model;

[0028] Figure 3 yes Figure 2 Sectional view of AA;

[0029] Figure 4 yes Figure 2 BB section view;

[0030] Figure 5 This is a top view of the heat exchange component in Embodiment 1 of this utility model;

[0031] Figure 6 yes Figure 5 CC section view;

[0032] Figure 7 This is a schematic diagram of the stirring assembly in Embodiment 1 of this utility model.

[0033] The diagram is labeled as follows: 1. Reactor body assembly; 2. Heat exchange assembly; 3. Discharge body assembly; 4. Stirring assembly; 5. Reactor lower head; 6. Reactor upper head; 7. Inner cylinder; 8. Jacket; 9. Feed inlet pipe; 10. Discharge inlet pipe; 11. Heat exchange medium inlet pipe; 12. Heat exchange medium outlet pipe; 13. Tube side of heat exchange assembly; 14. Shell side of heat exchange assembly; 15. Stirring shaft; 16. Stirrer; 17. Instrumentation pipe. Detailed Implementation

[0034] This invention provides a plug flow dynamic tubular reactor. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the following provides a more detailed description. It should be understood that the specific embodiments described herein are merely illustrative of this invention and are not intended to limit it.

[0035] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] The present invention will now be described in detail with reference to the accompanying drawings:

[0037] Reference Figure 1 This embodiment provides a plug flow dynamic tubular reactor, which is vertically placed and the reactant flows from bottom to top. The reactor specifically includes:

[0038] The reaction cylinder assembly 1 and the heat exchange assembly 2 can be set into one or more sets and connected in series alternately from bottom to top according to the reaction requirements.

[0039] The discharge cylinder assembly 3 is located above the uppermost heat exchange assembly 2 and is connected to the heat exchange assembly 2;

[0040] The stirring component 4 is installed throughout the reaction cylinder assembly 1, the heat exchange assembly 2 and the discharge cylinder assembly 3, and is used to stir the reaction materials inside the cylinders of the reaction cylinder assembly 1 and the discharge cylinder assembly 3.

[0041] The reactor lower head 5 and reactor upper head 6 are respectively sealed to the lowest reaction cylinder assembly 1 and the highest discharge cylinder assembly 3 to ensure the overall sealing of the reactor.

[0042] When the above components are installed as a whole, the two adjacent reaction cylinder components 1 and heat exchange components 2, and the discharge cylinder component 3 and heat exchange components 2 are connected by flanges.

[0043] Reference Figures 2 to 3 Both the aforementioned reaction cylinder assembly 1 and discharge cylinder assembly 3 include an inner cylinder 7, and at least one end of the inner cylinder 7 is a tapered shape with an outwardly flared opening. At least the outer wall of the inner cylinder 7 of the reaction cylinder assembly 1, located at the lowest point, is provided with a feed pipe 9 for the reaction material to enter the inner cylinder 7, and the outer wall of the inner cylinder 7 of the discharge cylinder assembly 3 is provided with a discharge pipe 10 for the reaction material to flow out of the inner cylinder 7. One or more feed pipes 9 or discharge pipes 10 can be provided as needed. When multiple are provided, the multiple feed pipes 9 or discharge pipes 10 are distributed circumferentially along the corresponding inner cylinder 7. Different reaction materials can continuously enter the reaction cylinder assembly 1 through one or more feed pipes 9 of the same reaction cylinder assembly 1, or continuously enter different reaction cylinder assemblies 1 through one or more feed pipes 9 of different reaction cylinder assemblies 1. The reaction material that meets the discharge requirements flows out through one or more discharge pipes 10 of the discharge cylinder assembly 3.

[0044] The aforementioned reaction cylinder assembly 1 and discharge cylinder assembly 3 also include a jacket 8 sleeved on the outer layer of the inner cylinder 7, forming a heat exchange cavity between the jacket 8 and the inner cylinder 7. The outer wall of the jacket 8 of the aforementioned reaction cylinder assembly 1 and discharge cylinder assembly 3 is provided with a heat exchange medium inlet pipe 11 and a heat exchange medium outlet pipe 12 that are connected to the heat exchange cavity between the inner cylinder 7 and the jacket 8, for introducing heat exchange medium into the heat exchange cavity between the inner cylinder 7 and the jacket 8 to exchange heat with the reaction materials.

[0045] Reference Figure 5 and Figure 6 The heat exchange component 2 is specifically a shell-and-tube heat exchanger without end caps at both ends. The tube side 13 of the heat exchange component is connected to the inner cylinder 7 of the adjacent reaction cylinder component 1 or discharge cylinder component 3. The outer wall of the shell side 14 of the heat exchange component is provided with a heat exchange medium inlet pipe 11 and a heat exchange medium outlet pipe 12 that are connected to the shell side, for introducing heat exchange medium into the shell side 14 of the heat exchange component to further heat exchange the reactants in the tube side.

[0046] In this embodiment, the heat exchange component 2 adopts a shell-and-tube heat exchanger with a large heat exchange area and strong heat exchange capacity. Moreover, the heat exchange component 2 can not only serve as a heat exchange element, but also as a one-way throttling unit between two adjacent reaction cylinder components 1. The reactant material enters the next stage reaction cylinder component 1 from the upper stage reaction cylinder component 1 through the tube side 13 of the heat exchange component, which greatly reduces the back mixing of the reactant material.

[0047] Reference Figure 7 The aforementioned stirring assembly 4 includes a stirring shaft 15 and a plurality of agitators 16 arranged axially on the stirring shaft 15. The stirring shaft 15 passes through the center of the reaction cylinder assembly 1, the heat exchange assembly 2, and the discharge cylinder assembly 3 axially, and the center of the heat exchange assembly 2 is provided with a circumferentially closed through hole for the stirring shaft 15 to pass through, that is, the outer wall of the through hole closes the inner ring of the shell side of the heat exchange assembly; the plurality of agitators 16 are respectively arranged in the inner cylinder 7 of the reaction cylinder assembly 1 and the discharge cylinder assembly 3, and the agitators 16 are specifically paddle, toothed, or turbine agitators, used to stir and disperse the reaction materials inside the inner cylinder 7 of the reaction cylinder assembly 1 and the discharge cylinder assembly 3 to achieve sufficient mixing and mass transfer.

[0048] In addition, the stirring shaft 15 of the aforementioned stirring assembly 4 extends from both ends of the reactor lower head 5 and reactor upper head 6, and is rotatably connected to the reactor lower head 5 and reactor upper head 6, respectively. Specifically, in this embodiment, the reactor lower head 5 is a sealing plate, the lower end of the stirring shaft 15 is rotatably connected to the reactor lower head 5 through a sealed bearing, and the reactor upper head 6 is a mechanical seal, with the upper end of the stirring shaft 15 rotating in a mechanical seal with the reactor upper head 6. The reactor lower head 5 and reactor upper head 6 can also employ other structures to achieve rotatable sealing with the stirring shaft 15.

[0049] In addition, the stirring shaft 15 of the stirring assembly 4 should also be connected to a drive assembly for driving the stirring shaft 15 to rotate. The drive assembly can be a servo motor, and the output shaft of the servo motor is connected to the stirring shaft 15 through a coupling.

[0050] Example 2

[0051] Reference Figure 2 and Figure 3The difference between this embodiment and Embodiment 1 is that this embodiment also provides an instrument connection pipe 17 communicating with the inner cylinder 7 on the outer wall of at least one reaction cylinder assembly 1 and / or discharge cylinder assembly 3. That is, the instrument connection pipe 17 can be provided as needed, specifically on one or more reaction cylinder assemblies 1, or on the discharge cylinder assembly 3; moreover, the number of instrument connection pipes 17 provided on the reaction cylinder assembly 1 and / or discharge cylinder assembly 3 can also be provided as needed, that is, one or more instrument connection pipes 17 can be provided on each cylinder assembly, and when multiple are provided, the multiple instrument connection pipes 17 are distributed circumferentially along the corresponding inner cylinder 7.

[0052] The aforementioned instrument connector 17 is used to connect to thermometers, pressure gauges, etc., to monitor reaction parameters such as temperature and pressure during the reaction process, ensuring the safe conduct of the reaction. At the same time, it can also adjust the flow rate and temperature of the heat exchange medium according to the monitored temperature data to achieve temperature control of different reaction cylinder components 1, that is, to achieve segmented temperature control and meet the reaction temperature requirements of different reaction stages.

[0053] The working process of the plug flow dynamic tubular reactor provided in Example 1 or Example 2 above is as follows:

[0054] First, different reactants are continuously fed into the preferred bottom-level first-stage reaction cylinder assembly through one or more feed inlets. The heat exchange medium enters the heat exchange chamber between the inner cylinder and the jacket through the heat exchange medium inlet on the reaction cylinder assembly. Within the inner cylinder of the reaction cylinder assembly, the reactants are stirred and dispersed by a stirrer to ensure thorough mixing and mass transfer. During the reaction, some of the heat generated is carried away by the heat exchange medium in the heat exchange chamber. After heat exchange, the heat exchange medium flows out through the heat exchange medium outlet on the reaction cylinder assembly. Subsequently, the reactants enter the first-stage heat exchange assembly from the first-stage reaction cylinder assembly, and within the tube side of the heat exchange assembly... The reaction flows from bottom to top, with the heat exchange medium entering the shell side of the heat exchange component through the heat exchange medium feed pipe. It then exchanges heat fully with the reactants, and the heat generated by the reaction is carried away again. After the heat exchange is completed, the heat exchange medium flows out through the heat exchange medium outlet pipe on the heat exchange component. The reactants then enter the second-stage reaction cylinder component for mixing. If the reaction is staged, new reactants of other types can be added through the feed pipe of the second-stage reaction cylinder component, and then enter the second-stage heat exchange component again for heat exchange. This process of mixing and heat exchange continues stage by stage until the requirements for discharge are met, and the reactants flow out through the discharge pipe of the discharge cylinder component.

[0055] In addition, during the above-mentioned process, temperature gauges, pressure gauges, etc. can be connected to the instrument pipes of the reaction cylinder assembly and the discharge cylinder assembly to monitor the reaction parameters, thereby achieving segmented and precise temperature control, enabling different stages of reaction under different temperature conditions in one reactor, and determining whether the discharge temperature and other parameters meet the requirements to control product quality.

[0056] It should be noted that any parts not mentioned in this utility model can be achieved by adopting or referencing existing technologies.

[0057] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A plug flow dynamic tubular reactor, placed vertically, characterized in that, include: At least one set of reaction cylinder assembly (1) and at least one set of heat exchange assembly (2), wherein the reaction cylinder assembly (1) and the heat exchange assembly (2) are connected in series alternately from bottom to top; The discharge cylinder assembly (3) is located above the uppermost heat exchange assembly (2) and is in communication with the heat exchange assembly (2); The stirring assembly (4) is disposed throughout the reaction cylinder assembly (1), the heat exchange assembly (2) and the discharge cylinder assembly (3).

2. The plug flow dynamic tubular reactor according to claim 1, characterized in that, Both the reaction cylinder assembly (1) and the discharge cylinder assembly (3) include an inner cylinder (7). At least one feed pipe (9) is provided on the outer wall of the inner cylinder (7) of the reaction cylinder assembly (1) at least at the bottom. At least one discharge pipe (10) is provided on the outer wall of the inner cylinder (7) of the discharge cylinder assembly (3). The feed pipe (9) and the discharge pipe (10) are respectively connected to the corresponding inner cylinder (7).

3. A plug flow dynamic tubular reactor according to claim 2, characterized in that, The reaction cylinder assembly (1) and the discharge cylinder assembly (3) both include a jacket (8) sleeved on the outer layer of the inner cylinder (7). A heat exchange cavity is formed between the jacket (8) and the inner cylinder (7). A heat exchange medium inlet pipe (11) and a heat exchange medium outlet pipe (12) connected to the heat exchange cavity are provided on the outer wall of the jacket (8).

4. A plug flow dynamic tubular reactor according to claim 2, characterized in that, At least one instrument connector (17) is provided on the outer wall of the inner cylinder (7) of at least one of the reaction cylinder assembly (1) and / or discharge cylinder assembly (3), and the instrument connector (17) is connected to the corresponding inner cylinder (7).

5. A plug flow dynamic tubular reactor according to claim 1, characterized in that, The heat exchange assembly (2) is a tube-type heat exchanger without end caps at both ends, and the tube side (13) of the heat exchange assembly is connected to the adjacent reaction cylinder assembly (1) and discharge cylinder assembly (3). The outer wall of the shell side (14) of the heat exchange assembly is provided with a heat exchange medium inlet pipe (11) and a heat exchange medium outlet pipe (12) connected to the shell side.

6. A plug flow dynamic tubular reactor according to claim 1, characterized in that, The stirring assembly (4) includes a stirring shaft (15) and a plurality of stirrers (16) arranged axially on the stirring shaft (15). The stirring shaft (15) passes through the center of the reaction cylinder assembly (1), the heat exchange assembly (2), and the discharge cylinder assembly (3) axially. The plurality of stirrers (16) are respectively arranged inside the reaction cylinder assembly (1) and the discharge cylinder assembly (3).

7. A plug flow dynamic tubular reactor according to claim 6, characterized in that, The agitator (16) is a paddle, toothed, or turbine agitator.

8. A plug flow dynamic tubular reactor according to claim 6, characterized in that, The heat exchange assembly (2) has a through hole at its center for the stirring shaft (15) to pass through, and the through hole is circumferentially closed.

9. A plug flow dynamic tubular reactor according to claim 1, characterized in that, It also includes a reactor lower head (5) and a reactor upper head (6), wherein the reactor lower head (5) and reactor upper head (6) are respectively sealed and connected to the lowermost reaction cylinder assembly (1) and the uppermost discharge cylinder assembly (3).

10. A plug flow dynamic tubular reactor according to any one of claims 1-9, characterized in that, The two adjacent reaction cylinder assemblies (1) and heat exchange assembly (2), and the discharge cylinder assembly (3) and heat exchange assembly (2) are connected by flanges.

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