Micro-channel heat exchange type reactor

Abstract

The utility model belongs to the technical field of micro-reactors, and discloses a micro-channel heat exchange type reactor. Comprising a horizontal kettle body, a first micro-channel heat exchanger is arranged at the upper part in the horizontal kettle body along the axial direction of the horizontal kettle body, and a second micro-channel heat exchanger is arranged at the lower part in the horizontal kettle body along the axial direction of the horizontal kettle body; a reaction liquid inlet is formed in the bottom of one end of the horizontal kettle body, and a liquid outlet is formed in the bottom of the other end of the horizontal kettle body; a liquid level controller is also arranged in the horizontal kettle body; the top of the liquid level controller is located between the first micro-channel heat exchanger and the second micro-channel heat exchanger, and a plurality of micro-channel holes are formed in the liquid level controller. An exhaust port is formed in the top of the horizontal kettle body; the device is more suitable for slow reaction and longer heat exchange effect required in deep reaction; the horizontal kettle bodies of the device can be connected in series in a multi-stage manner, so that the reaction time and the heat exchange path are further prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of chemical production technology and relates to a microreactor, specifically a microchannel heat exchange reactor. Background Technology

[0002] A microreactor is a device that carries out chemical reactions at a microscale, typically consisting of microchannels, mixers, separators, and control units. With the continuous advancement of microfabrication and microfluidics technologies, microreactors have gradually become a research hotspot in fields such as chemical synthesis, biomedicine, and materials science. Their characteristics include miniaturization, continuous operation, efficient mixing, rapid heat and mass transfer, and precise control, promoting intrinsic safety.

[0003] For some reactions that require deep esterification, a sufficiently long reaction time and heat exchange time are needed to promote the deep esterification reaction. However, existing microchannel heat exchange reactors are characterized by high efficiency and speed, which makes them unsuitable for widespread application in such deep reactions. Utility Model Content

[0004] This invention overcomes the shortcomings of the prior art and proposes a microchannel heat exchange reactor; it enables the microchannel heat exchange reactor to be used in deep chemical reactions, while also achieving the effect of efficient heat exchange.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] A microchannel heat exchange reactor includes a horizontal vessel body; a first microchannel heat exchanger is arranged along the axial direction of the vessel body at the upper part inside the vessel body, and a second microchannel heat exchanger is arranged along the axial direction of the vessel body at the lower part inside the vessel body; the first microchannel heat exchanger is connected to a cooling medium circulation pipeline, and the second microchannel heat exchanger is connected to a heating medium circulation pipeline; a reaction liquid inlet is provided at the bottom of one end of the horizontal vessel body, and a drain outlet is provided at the bottom of the other end of the horizontal vessel body; a liquid level controller is also provided inside the horizontal vessel body; the liquid level controller is located inside the drain outlet; the top of the liquid level controller is located between the first and second microchannel heat exchangers, and the liquid level controller is provided with a plurality of microchannel holes; an exhaust port is provided at the top of the horizontal vessel body.

[0007] Furthermore, a flow channel is provided at the bottom of the liquid level controller.

[0008] Furthermore, the second microchannel heat exchanger and the first microchannel heat exchanger have the same structure; both include a heat exchange tube body, one end of which is closed and the other end is open; the outer wall of the heat exchange tube body is provided with a spiral heat exchange microchannel groove, and the inner wall of the heat exchange tube body is provided with grooves arranged along the axial direction of the heat exchange tube body to increase the heat exchange area.

[0009] Furthermore, the second microchannel heat exchanger and the first microchannel heat exchanger are connected to the horizontal vessel body via a heat exchange tube support plate.

[0010] Furthermore, the heat exchanger tube support plate is provided with several through-holes for liquid flow, and two through-holes for heat exchanger tube support are provided on the heat exchanger tube support plate.

[0011] Furthermore, a heating medium inlet pipe is inserted into the second microchannel heat exchanger, and one open end of the second microchannel heat exchanger is connected to the heating medium return chamber; a cooling medium inlet pipe is inserted into the first microchannel heat exchanger, and one open end of the first microchannel heat exchanger is connected to the cooling medium return chamber.

[0012] Furthermore, both the heating medium return chamber and the cooling medium return chamber are located inside the horizontal vessel body, and the heating medium return chamber and the cooling medium return chamber are isolated from each other.

[0013] Furthermore, the horizontal vessel body is provided with a heating medium drain port, a cooling medium drain port, a heating medium inlet port, and a cooling medium inlet port; the heating medium drain port is connected to the heating medium return chamber; the cooling medium drain port (8) is connected to the cooling medium return chamber; the heating medium inlet port is connected to the heating medium inlet pipe; and the cooling medium inlet port is connected to the cooling medium inlet pipe.

[0014] Furthermore, a liquid level detection sensor is installed inside the horizontal reactor.

[0015] The beneficial effects of this utility model compared to the prior art are as follows:

[0016] The vessel structure adopted in this invention is horizontal, forming a flat-push form for the reactants. After the reactants are fed into the vessel at a certain pressure at the inlet end, the reactants gradually flow towards the outlet end of the vessel. During the flow process, the contact path of the reactants is extended, and the heat exchange path is also extended, which is more suitable for deep reactions such as deep esterification reactions that require slow reactions and longer heat exchange effects. The horizontal vessel of this device can be connected in series in multiple stages to further extend the reaction time and heat exchange path.

[0017] The upper and lower microchannel heat exchanger of this invention features both cold and hot heat exchange tubes within the same reactor body, achieving a dual heat exchange effect. The bottom heat exchange tube ensures that the temperature inside the reactor is at the optimal reaction temperature, while the gas generated in the reaction is cooled by the upper heat exchange tube, and the reactants entrained in the gas are cooled and refluxed, ensuring the proper proportions of the reactants.

[0018] The liquid level controller described in this invention can ensure the highest liquid level in the reactor. Structurally, it is equipped with a top vent, which can realize the function of venting in real time during the reaction process. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the external structure of the microchannel heat exchange reactor proposed in this utility model.

[0020] Figure 2 This is an internal cross-sectional view of the microchannel heat exchange reactor proposed in this utility model;

[0021] Figure 3 This is a schematic diagram of the liquid level controller described in this utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the heat exchanger tube support plate described in this utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the heat exchange tube body described in this utility model;

[0024] Figure 6 for Figure 5 Sectional view along the AA direction.

[0025] In the picture:

[0026] 1. Reactor head; 2. Horizontal vessel body; 5. Reaction liquid inlet; 6. Heating medium outlet; 7. Exhaust port; 8. Cooling medium outlet; 9. Outlet; 10. Liquid level controller; 11. Heat exchanger tube support plate; 12. Second microchannel heat exchanger; 13. First microchannel heat exchanger; 14. Liquid level detection sensor; 15. Heating medium inlet; 16. Cooling medium inlet; 17. Cooling medium inlet pipe; 18. Heating medium inlet pipe; 19. Heating medium return chamber; 20. Microchannel hole; 21. Flow channel; 22. Spiral heat exchanger microchannel channel; 23. Groove for increasing heat exchange area; 24. Flow hole; 25. Heat exchanger tube support hole; 26. Cooling medium return chamber. Detailed Implementation

[0027] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, this utility model will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it. The technical solution of this utility model will be described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0028] See Figures 1 to 6This embodiment proposes a microchannel heat exchange reactor, including a horizontal vessel body 2; a reactor head 1 is provided at the front end of the horizontal vessel body 2. A first microchannel heat exchanger 13 is arranged along the axial direction of the horizontal vessel body 2 at the upper part of the interior, and a second microchannel heat exchanger 12 is arranged along the axial direction of the horizontal vessel body 2 at the lower part of the interior; the first microchannel heat exchanger 13 is connected to a cooling medium circulation pipeline, and the second microchannel heat exchanger 12 is connected to a heating medium circulation pipeline; a reaction liquid inlet 5 is provided at the bottom of one end of the horizontal vessel body 2, and a drain outlet 9 is provided at the bottom of the other end of the horizontal vessel body 2; a liquid level controller 10 is also provided inside the horizontal vessel body 2; the liquid level controller 10 is located inside the drain outlet 9; the top of the liquid level controller 10 is located between the first microchannel heat exchanger 13 and the second microchannel heat exchanger 12, and a plurality of microchannel holes 20 are provided on the liquid level controller 10; a flow channel 21 is provided at the bottom of the liquid level controller 10. The top of the horizontal vessel body 2 is provided with an exhaust port 7.

[0029] Specifically, in this embodiment, the second microchannel heat exchanger 12 and the first microchannel heat exchanger 13 have the same structure; both include a heat exchange tube body, one end of which is closed and the other end is open. For more efficient heat exchange, the outer wall of the heat exchange tube body is provided with a spiral heat exchange microchannel groove 22, and the inner wall of the heat exchange tube body is provided with grooves 23 arranged axially along the heat exchange tube body to increase the heat exchange area. The second microchannel heat exchanger 12 and the first microchannel heat exchanger 13 are connected to the horizontal vessel body 2 via a heat exchange tube support plate 11. The heat exchange tube support plate 11 has several through-holes 24 evenly distributed on it, and two through-holes 25 on it. The second microchannel heat exchanger 12 and the first microchannel heat exchanger 13 each pass through one heat exchange tube support hole 25.

[0030] The heating medium circulation pipeline includes a heating medium inlet pipe 18; the cooling medium circulation pipeline includes a cooling medium inlet pipe 17; the heating medium inlet pipe 18 is inserted into the second microchannel heat exchanger 12, and one open end of the second microchannel heat exchanger 12 is connected to the heating medium return chamber 19; the cooling medium inlet pipe 17 is inserted into the first microchannel heat exchanger 13, and one open end of the first microchannel heat exchanger 13 is connected to the cooling medium return chamber 26. Both the heating medium return chamber 19 and the cooling medium return chamber 26 are located inside the horizontal vessel body 2, and are isolated from each other. The horizontal vessel body 2 is provided with a heating medium drain port 6, a cooling medium drain port 8, a heating medium inlet port 15, and a cooling medium inlet port 16; the heating medium drain port 6 is connected to the heating medium return chamber 19; the cooling medium drain port 8 is connected to the cooling medium return chamber 26; the heating medium inlet port 15 is connected to the heating medium inlet pipe 18; and the cooling medium inlet port 16 is connected to the cooling medium inlet pipe 17.

[0031] To further improve the monitoring of the internal liquid level, a liquid level detection sensor 14 is installed inside the horizontal vessel body 2.

[0032] This embodiment proposes the following working principle for a microchannel heat exchange reactor:

[0033] This embodiment uses the production of tributyl phosphate as an example. Phosphorus oxychloride and n-butanol are first reacted exothermically in existing reaction equipment to produce a mixture of haloesters, hydrogen chloride, and butanol. This mixture is then fed into the horizontal reactor 2 under pressure through the reaction liquid inlet 5 and flows towards the outlet 9. During this flow, a high-temperature medium flows along the inner wall of the second microchannel heat exchanger 12, heating the reactants and providing a suitable reaction temperature. The reactants generated inside the reactor are cooled by contacting the first microchannel heat exchanger 13, cooling and refluxing the reactants carried in the gas to ensure the correct proportions. When the deep esterification reaction product in the horizontal reactor 2 reaches a certain liquid level, it flows from the top of the level controller 10 to the outlet 9, resulting in a mixture of tributyl phosphate and butanol. When it is necessary to empty the horizontal reactor 2, the residual liquid is drained through several microchannel holes 20 on the level controller 10 and a flow channel 21 at the bottom. The resulting mixture of tributyl phosphate and butanol is then separated in a subsequent process to obtain the final product, tributyl phosphate. The horizontal reactor 2 described in this apparatus can be connected in multiple stages to further extend the reaction time and heat exchange path.

[0034] The above description is a further detailed explanation of the present invention in conjunction with specific preferred embodiments. It should not be considered that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the present invention, and all such deductions or substitutions should be considered to fall within the scope of patent protection determined by the submitted claims.

Claims

1. A microchannel heat exchange reactor, characterized in that, The system includes a horizontal vessel body (2); a first microchannel heat exchanger (13) is arranged on the upper part of the horizontal vessel body (2) along the axial direction of the horizontal vessel body (2), and a second microchannel heat exchanger (12) is arranged on the lower part of the horizontal vessel body (2) along the axial direction of the horizontal vessel body (2); the first microchannel heat exchanger (13) is connected to a cooling medium circulation pipeline, and the second microchannel heat exchanger (12) is connected to a heating medium circulation pipeline; a reaction liquid inlet (5) is provided at the bottom of one end of the horizontal vessel body (2), and a drain outlet (9) is provided at the bottom of the other end of the horizontal vessel body (2); a liquid level controller (10) is also provided inside the horizontal vessel body (2); the liquid level controller (10) is located inside the drain outlet (9); the top of the liquid level controller (10) is located between the first microchannel heat exchanger (13) and the second microchannel heat exchanger (12), and a number of microchannel holes (20) are provided on the liquid level controller (10); an exhaust port (7) is provided on the top of the horizontal vessel body (2).

2. The microchannel heat exchange reactor according to claim 1, characterized in that, The liquid level controller (10) is provided with a liquid flow tank (21) at the bottom.

3. The microchannel heat exchange reactor according to claim 1, characterized in that, The second microchannel heat exchanger (12) and the first microchannel heat exchanger (13) have the same structure; both include a heat exchange tube body, one end of which is closed and the other end is open; the outer wall of the heat exchange tube body is provided with a spiral heat exchange microchannel groove (22), and the inner wall of the heat exchange tube body is provided with a groove (23) arranged along the axial direction of the heat exchange tube body to increase the heat exchange area.

4. A microchannel heat exchange reactor according to claim 3, characterized in that, The second microchannel heat exchanger (12) and the first microchannel heat exchanger (13) are connected inside the horizontal vessel body (2) through a heat exchange tube support plate (11).

5. A microchannel heat exchange reactor according to claim 4, characterized in that, The heat exchange tube support plate (11) has several through-holes (24) evenly distributed on it, and the heat exchange tube support plate (11) has two through-holes (25).

6. A microchannel heat exchange reactor according to claim 3, characterized in that, The heating medium inlet pipe (18) is inserted into the second microchannel heat exchanger (12), and one open end of the second microchannel heat exchanger (12) is connected to the heating medium return chamber (19); the cooling medium inlet pipe (17) is inserted into the first microchannel heat exchanger (13), and one open end of the first microchannel heat exchanger (13) is connected to the cooling medium return chamber (26).

7. A microchannel heat exchange reactor according to claim 6, characterized in that, The heating medium return chamber (19) and the cooling medium return chamber (26) are both located inside the horizontal vessel body (2), and the heating medium return chamber (19) and the cooling medium return chamber (26) are isolated from each other.

8. A microchannel heat exchange reactor according to claim 7, characterized in that, The horizontal vessel body (2) is provided with a heating medium drain port (6), a cooling medium drain port (8), a heating medium inlet port (15), and a cooling medium inlet port (16); the heating medium drain port (6) is connected to the heating medium return chamber (19); the cooling medium drain port (8) is connected to the cooling medium return chamber (26); the heating medium inlet port (15) is connected to the heating medium inlet pipe (18); and the cooling medium inlet port (16) is connected to the cooling medium inlet pipe (17).

9. A microchannel heat exchange reactor according to claim 1, characterized in that, The horizontal vessel body (2) is equipped with a liquid level detection sensor (14).

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