Efficient environment-friendly nitration reaction microchannel reactor

Abstract

The invention provides an efficient environment-friendly nitration reaction microchannel reactor which comprises at least one mounting plate, supporting legs are arranged at the bottom of the mounting plate, at least one supporting cylinder is mounted on the mounting plate and is vertically arranged, one side of the top of the supporting cylinder is connected with a mixer, and at least two pipe joints are arranged at the end, away from the supporting cylinder, of the mixer. Each pipe joint is connected with a liquid inlet pipe; the number of the conveying pipes corresponds to that of the liquid inlet pipes, and the free ends of the liquid inlet pipes are connected with the conveying pipes respectively; a stirring mechanism is arranged in the supporting cylinder, and the bottom of the supporting cylinder is connected with a discharging pipe. During use, a reactant is conveyed into the mixer through the liquid inlet pipe by the reactant conveying pipe, the reactant in the conveying pipe is dispersed into a plurality of reaction channels from the beginning of reaction, each reaction channel is a micro-channel, and when passing through the micro-channels, the reactant sequentially passes through the mixer to be mixed and then is stirred and mixed by the stirring blades, so that the reaction is completed. The working efficiency is high, and the reaction amount is large.

Description

Technical Field

[0001] The invention relates to the technical field of nitrification reactors, in particular to a high-efficiency and environment-friendly nitrification reaction microchannel reactor. Background Art

[0002] Nitration reaction is one of the more common reactions in industrial production, and its nitration products occupy an important position in medicine, pesticides, dyes, etc. Most of the existing nitration reactions are carried out in reaction tanks, with low reaction efficiency and cannot be produced while reacting, and the reaction efficiency is low.

[0003] For example, a microchannel reactor for nitration reaction proposed in document number "CN209451808U" has reactants entering from the liquid inlet respectively during use, and reactants react in the reaction channel, and the reaction channel is curved to increase the mixing degree of reactants. However, the microchannel reactor has a simple structure and a small flow rate, so it cannot be produced in large quantities. Therefore, we propose a highly efficient and environmentally friendly microchannel reactor for nitration reaction. Summary of the invention

[0004] In view of the disadvantage of low reaction efficiency in the prior art, the present invention provides a high-efficiency and environmentally friendly nitration reaction microchannel reactor, which has the advantages of allowing reactants to be dispersed in each supporting tube for reaction, large flow rate and high reaction efficiency, thus solving the problems raised in the above-mentioned background technology.

[0005] The technical solution of the present invention is achieved as follows: a high-efficiency and environmentally friendly nitration reaction microchannel reactor, comprising at least one mounting plate, a supporting leg being provided at the bottom of the mounting plate, at least one supporting tube being installed on the mounting plate, and the supporting tube being arranged vertically; one side of the top of the supporting tube is connected to a mixer, and at least two pipe joints are provided at one end of the mixer away from the supporting tube, and each pipe joint is respectively connected to a liquid inlet pipe; it also includes a number of delivery pipes corresponding to the number of liquid inlet pipes, and the free ends of the liquid inlet pipes are respectively connected to the delivery pipes; a stirring mechanism is provided in the supporting tube, the bottom of the supporting tube is connected to a discharge pipe, and the free end of the discharge pipe is connected to a collecting pipe.

[0006] Preferably, there are two support tubes on each mounting plate, the support tubes are distributed on both sides of the mounting plate, and the bottom of the support tubes is connected to the mounting plate through a mounting seat.

[0007] Preferably, a connecting plate is coaxially provided on the bottom surface of the support tube, the bottom of the support tube is placed in the mounting seat, and the connecting plate is placed on the top of the mounting seat and the two are connected by fasteners; the mounting seat is a "T"-shaped mechanism, and the end of the mounting seat away from the connecting plate is placed on the top of the edge of the mounting plate and the two are connected by fasteners.

[0008] Preferably, the mixer is a venturi mixer.

[0009] Preferably, the stirring mechanism includes a stirring shaft coaxially disposed in the support tube, a plurality of stirring blades are provided on the surface of the stirring shaft, a gap is provided between the stirring blades and the inside of the support tube, and a driving mechanism for driving the stirring shaft to rotate is provided on the top of the support tube.

[0010] Preferably, the driving mechanism includes a cylindrical shell coaxially mounted on the top of the supporting cylinder, a cross is detachably mounted inside the cylindrical shell, the top of the stirring shaft is rotatably mounted at the center of the cross, and a second magnetic stirring bar is also mounted on the top of the stirring shaft; a first magnetic stirring bar corresponding to the second magnetic stirring bar is provided above the top of the cylindrical shell, the first magnetic stirring bar is mounted on the rotating shaft of the driving motor, and the driving motor is mounted on the mounting beam; a vertical bracket is installed in the middle of the top of the mounting plate, and the top of the vertical bracket is connected to the mounting beam.

[0011] Preferably, a protective cover is provided under each driving motor, the top of the protective cover is connected to the mounting beam, the cylindrical outer shell is coaxial with the protective cover, and the protective cover covers the cylindrical outer shell.

[0012] Preferably, each liquid inlet pipe is equipped with a flow sensor and an electric control valve.

[0013] Preferably, the top of the cylindrical housing is sealed by a sealing cover, and the edge of the sealing cover and the top edge of the cylindrical housing are connected by fasteners.

[0014] Compared with the prior art, when the present invention is in use, the reactant delivery pipe is delivered into the mixer through the liquid inlet pipe. Since the reaction starts, the reactants in the delivery pipe are dispersed into multiple reaction channels, each reaction channel is a microchannel. When the reactants pass through the microchannel, they are mixed in the mixer in turn, and then stirred and mixed by the stirring blades. In addition, the support tube is shaped as a slender structure, so the reactants are fully stirred from top to bottom by the stirring blades. Therefore, the microchannel reactor has high working efficiency and large reaction volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of one side of the present invention.

[0017] Figure 2 It is a schematic structural diagram of another embodiment of the present invention.

[0018] Figure 3 The specific structure of the mounting plate in the present invention is shown in FIG. Figure 1 .

[0019] Figure 4 The specific structure of the mounting plate in the present invention is shown in FIG. Figure 2 .

[0020] Figure 5 It is a schematic diagram of the internal structure of the present invention.

[0021] In the figure: 1. mounting plate; 2. protective cover; 3. conveying pipe; 4. supporting cylinder; 5. pipe joint; 6. liquid inlet pipe; 7. mixer; 8. driving motor; 9. mounting beam; 10. vertical bracket; 11. supporting leg; 12. connecting plate; 13. collecting pipe; 14. mounting seat; 15. discharge pipe; 16. stirring shaft; 17. cylindrical shell; 18. first magnetic stirring bar; 19. sealing cover; 20. cross; 21. stirring blade; 22. second magnetic stirring bar. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be clearly and completely described below in conjunction with 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 of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Reference Figures 1 to 5 The present invention provides a technical solution: a high-efficiency and environmentally friendly nitration reaction microchannel reactor, comprising at least one mounting plate 1, and a supporting leg 11 is provided at the bottom of the mounting plate 1. Figure 1 As shown, there are three mounting plates 1, and the mounting plates 1 are arranged in a straight line.

[0024] At least one support tube 4 is installed on the mounting plate 1. The support tube 4 is vertically arranged. There are two support tubes 4 on each mounting plate 1. The support tubes 4 are distributed on both sides of the mounting plate 1. The bottom of the support tube 4 is connected to the mounting plate 1 through the mounting seat 14. The support tube 4 here is detachable. Specifically, a connecting plate 12 is coaxially arranged on the bottom surface of the support tube 4. The bottom of the support tube 4 is placed in the mounting seat 14, and the connecting plate 12 is placed on the top of the mounting seat 14. The two are connected by fasteners, that is, the two are fastened by bolts. Therefore, since the support tube 4 is detachable, the support tube 4 can be disassembled for maintenance after long-term use;

[0025] The mounting seat 14 is a "T"-shaped structure, and one end of the mounting seat 14 away from the connecting plate 12 is placed on the top of the edge of the mounting plate 1 and the two are connected by fasteners, that is, the two are fastened by bolts.

[0026] like Figure 1 and Figure 3As shown, one side of the top of the support tube 4 is connected to the mixer 7, and the end of the mixer 7 away from the support tube 4 is provided with at least two pipe joints 5, and each pipe joint 5 is respectively connected to a liquid inlet pipe 6; the present application also includes a number of delivery pipes 3 corresponding to the number of the liquid inlet pipes 6, and the free ends of the liquid inlet pipes 6 are respectively connected to the delivery pipes 3;

[0027] Specifically, there are at least two reactants in the nitration reaction, so the number of pipe joints 5 should correspond to the number of reactants, and there are as many delivery pipes 3 as there are reactants, that is, each delivery pipe 3 only needs to transport one reactant. Figure 1 and Figure 2 As shown, since there are multiple mounting plates 1, the number of liquid inlet pipes 6 is also multiple, and the delivery pipe 3 is a long pipe. The delivery pipe 3 passes through multiple liquid inlet pipes 6 to loosen and tighten the reactants into the mixer 7. The mixer 7 is a Venturi mixer, so multiple reactants can enter the mixer 7 at the same time for preliminary mixing, and then the mixed reactants flow into the top of the support tube 4 through the mixer 7, and then fall along the support tube 4.

[0028] In order to allow the reactants passing through the support tube 4 to have more sufficient contact, a stirring mechanism is provided in the support tube 4, and the stirring mechanism includes a stirring shaft 16 coaxially arranged in the support tube 4, and a plurality of stirring blades 21 are provided on the surface of the stirring shaft 16, and a gap is provided between the stirring blades 21 and the inside of the support tube 4, and the stirring blades 21 are spiral or arc-shaped structures, which are distributed on the surface of the stirring shaft 16 from top to bottom, and a driving mechanism for driving the stirring shaft 16 to rotate is provided on the top of the support tube 4, and the driving mechanism is used to drive the stirring shaft 16 to rotate, so that the rotating stirring blades 21 continue to stir and mix the reactants, so that the reactants are more fully contacted;

[0029] like Figure 5 As shown, the specific structure of the driving mechanism includes a cylindrical shell 17 coaxially mounted on the top of the support cylinder 4, a cross 20 is detachably mounted in the cylindrical shell 17, and the four ends of the cross 20 are fastened to the bottom of the cylindrical shell 17 by bolts, which is convenient for disassembly and installation, and the top of the stirring shaft 16 is rotatably mounted at the center of the cross 20, and a second magnetic stirring bar 22 is also installed on the top of the stirring shaft 16;

[0030] A first magnetic stirrer 18 corresponding to the second magnetic stirrer 22 is disposed above the top of the cylindrical housing 17. The first magnetic stirrer 18 is mounted on the rotating shaft of the drive motor 8, and the drive motor 8 is mounted on the mounting beam 9. A vertical bracket 10 is mounted in the middle of the top of the mounting plate 1, and the top of the vertical bracket 10 is connected to the mounting beam 9;

[0031] It should be noted that the diameter of the cylindrical shell 17 is larger than the diameter of the support cylinder 4, in order to allow the volume of the second magnetic stirrer 22 to be large enough, so that the force between the second magnetic stirrer 22 and the first magnetic stirrer 18 is also large enough. When the drive motor 8 rotates, it drives the first magnetic stirrer 18 to rotate, and there is a magnetic force between the first magnetic stirrer 18 and the second magnetic stirrer 22, so the second magnetic stirrer 22 rotates with the first magnetic stirrer 18, and the two form a "magnetic stirrer". The advantage of this is that the cylindrical shell 17 and the support cylinder 4 are sealed, avoiding the problem of leakage caused by the direct connection of the stirring shaft 16 to the drive motor 8 and the long-term rotation of the connection between the stirring shaft 16 and the cylindrical shell 17, making the operation of the entire device more environmentally friendly.

[0032] The reactants mixed in the support tube 4 have been mixed completely, the bottom of the support tube 4 is connected to the discharge pipe 15 , the free end of the discharge pipe 15 is connected to the collecting pipe 13 , and the collecting pipe 13 is fixed on the support leg 11 .

[0033] Furthermore, during the reaction, the driving motor 8 drives the first magnetic stirring bar 18 to rotate continuously. In order to prevent the first magnetic stirring bar 18 from contacting with external objects, such as Figure 4 As shown, a protective cover 2 is provided under each driving motor 8, the top of the protective cover 2 is connected to the mounting beam 9, the cylindrical housing 17 is coaxial with the protective cover 2, and the protective cover 2 covers the cylindrical housing 17. Here, a flange is provided on the top of the protective cover 2, and the flange is connected to the bottom of the mounting beam 9 by bolts. The protective cover 2 covers the rotating first magnetic stirring bar 18 to prevent the first magnetic stirring bar 18 from contacting with external objects.

[0034] Further, the top of the cylindrical housing 17 is sealed by a sealing cover 19, and the edge of the sealing cover 19 and the top edge of the cylindrical housing 17 are connected by fasteners, that is, the two are fastened by bolts. After opening the sealing cover 19, the stirring shaft 16 can be taken out from the support cylinder 4 for easy maintenance.

[0035] In the actual application process, a delivery pump is provided on each delivery pipe 3, and the delivery pumps are connected to the preparation tank through a pipeline. The preparation tank is used to store reactants, that is, the reactants in the preparation tank are delivered to each delivery pipe 3 by the delivery pump, and then the delivery pipe 3 is delivered to the mixer 7 through the liquid inlet pipe 6, and the reaction starts from then on;

[0036] Flow sensors and electric control valves are installed on each of the liquid inlet pipes 6 to facilitate the control and monitoring of each liquid inlet pipe 6. When the reactants flow out through the support cylinder 4, the reaction is complete. The reactants that have reacted completely eventually flow into the collection pipe 13. The end of the collection pipe 13 is connected to the collection pipe to collect the reactants.

[0037] The reactants in the delivery pipe are dispersed into a plurality of reaction channels, each of which is a microchannel. When the reactants pass through the microchannels, they are mixed in turn by the mixer, and then stirred and mixed by the stirring blades 21. The support tube 4 is slender in shape, so the reactants are fully stirred from top to bottom by the stirring blades 21.

[0038] Moreover, the support tube in the present application is a steel structure and is exposed to the air. During actual use, the heat generated by the internal reaction can be quickly dissipated, and the support tube 4, the cylindrical shell 17, and the sealing cover 19 are all made of non-magnetic materials.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-efficiency and environmentally friendly nitration reaction microchannel reactor, comprising at least one mounting plate (1), the bottom of the mounting plate (1) is provided with supporting legs (11), characterized in that: At least one support tube (4) is installed on the mounting plate (1), and the support tube (4) is arranged vertically; One side of the top of the support cylinder (4) is connected to the mixer (7), and at least two pipe joints (5) are provided at one end of the mixer (7) away from the support cylinder (4), and each pipe joint (5) is respectively connected to a liquid inlet pipe (6); and also includes delivery pipes (3) whose number corresponds to the number of the liquid inlet pipes (6), and the free ends of the liquid inlet pipes (6) are respectively connected to the delivery pipes (3); A stirring mechanism is provided in the support cylinder (4); and The bottom of the support cylinder (4) is connected to a discharge pipe (15), and the free end of the discharge pipe (15) is connected to the collecting pipe (13).

2. The high-efficiency and environmentally friendly nitration reaction microchannel reactor according to claim 1, characterized in that: There are two support tubes (4) on each mounting plate (1), and the support tubes (4) are distributed on both sides of the mounting plate (1). The bottom of the support tube (4) is connected to the mounting plate (1) via a mounting seat (14).

3. The high-efficiency and environmentally friendly nitration reaction microchannel reactor according to claim 2, characterized in that: A connecting plate (12) is coaxially arranged on the bottom surface of the supporting tube (4), the bottom of the supporting tube (4) is placed in the mounting seat (14), and the connecting plate (12) is placed on the top of the mounting seat (14), and the two are connected by fasteners; The mounting seat (14) is a "T"-shaped structure, and one end of the mounting seat (14) away from the connecting plate (12) is placed on the top of the edge of the mounting plate (1) and the two are connected by fasteners.

4. The high-efficiency and environmentally friendly nitration reaction microchannel reactor according to claim 1, characterized in that: The mixer (7) is a Venturi mixer.

5. The high-efficiency and environmentally friendly nitration reaction microchannel reactor according to claim 2, characterized in that: The stirring mechanism comprises a stirring shaft (16) coaxially arranged in a supporting tube (4); a plurality of stirring blades (21) are arranged on the surface of the stirring shaft (16); a gap is arranged between the stirring blades (21) and the inside of the supporting tube (4); and a driving mechanism for driving the stirring shaft (16) to rotate is arranged on the top of the supporting tube (4).

6. The high-efficiency and environmentally friendly nitration reaction microchannel reactor according to claim 5, characterized in that: The driving mechanism comprises a cylindrical housing (17) coaxially mounted on the top of the support cylinder (4), a cross (20) is detachably mounted in the cylindrical housing (17), the top of the stirring shaft (16) is rotatably mounted at the center of the cross (20), and a second magnetic stirring bar (22) is also mounted on the top of the stirring shaft (16); A first magnetic stirring bar (18) corresponding to the second magnetic stirring bar (22) is arranged above the top of the cylindrical housing (17); the first magnetic stirring bar (18) is mounted on the rotating shaft of the driving motor (8); and the driving motor (8) is mounted on the mounting beam (9); A vertical bracket (10) is installed at the middle of the top of the mounting plate (1), and the top of the vertical bracket (10) is connected to the mounting beam (9).

7. The high-efficiency and environmentally friendly nitration reaction microchannel reactor according to claim 6, characterized in that: A protective cover (2) is provided below each driving motor (8), the top of the protective cover (2) is connected to the mounting beam (9), the cylindrical shell (17) is coaxial with the protective cover (2), and the protective cover (2) covers the cylindrical shell (17) therein.

8. The high-efficiency and environmentally friendly nitration reaction microchannel reactor according to claim 1, characterized in that: A flow sensor and an electric control valve are installed on each liquid inlet pipe (6).

9. The high-efficiency and environmentally friendly nitration reaction microchannel reactor according to claim 6, characterized in that: The top of the cylindrical housing (17) is sealed by a sealing cover (19), and the edge of the sealing cover (19) and the top edge of the cylindrical housing (17) are connected by fasteners.

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