A pH buffer stirring device for reaction solution in compound synthesis

Abstract

This invention relates to the field of compound synthesis technology, and more particularly to a pH buffer stirring device for a reaction solution used in compound synthesis. The device includes a reaction vessel and a stirring assembly located inside the reaction vessel. The stirring assembly includes a rotating rod rotatably connected inside the reaction vessel and multiple stirring paddles spaced along the axial direction of the rotating rod. A motor with its output end connected to one end of the rotating rod is located at the bottom of the reaction vessel. The device also includes a storage tank, a conveying assembly, and a driving assembly. The storage tank is located at the top of the reaction vessel and is sealed to the end of the rotating rod furthest from the motor. This invention uses the driving assembly to drive the buffer solution in the storage tank through the conveying assembly into the interior of the reaction vessel. Since multiple conveying pipes extend into the corresponding stirring paddles, the buffer solution flowing out from the multiple outlet pipes flows into the reaction solution at different depths. Simultaneously with the outflow of the buffer solution, the motor drives the rotating rod to rotate, enhancing mixing with the reaction solution and improving the utilization rate of the buffer solution.

Description

Technical Field

[0001] This utility model relates to the field of compound synthesis technology, and in particular to a pH buffer stirring device for reaction liquid in compound synthesis. Background Technology

[0002] In the process of compound synthesis, the pH stability and mixing uniformity of the reaction solution inside the reactor directly determine the product purity, reaction efficiency and batch repeatability. Buffer solution is gradually added into the reactor through a fixing device at the top, and then the buffer solution is mixed with the reaction base liquid by the stirring device inside the reactor to maintain the pH stability of the reaction system and improve the reaction efficiency.

[0003] However, in the prior art, during the synthesis reaction of the compound, the buffer solution is always added to the reactor at a fixed position above the liquid surface. In the oil-water two-phase catalytic reaction, the reaction mainly occurs at the oil-water interface. The fixed-drop buffer solution is mostly concentrated in the upper layer of the aqueous phase and has difficulty penetrating into the internal region. This causes the pH in the internal region to be unstable, resulting in a decrease in catalytic efficiency. Even if the mixing is enhanced by increasing the stirring speed, the initial addition position of the buffer solution will be misaligned with the active reaction zone, causing a large amount of buffer solution to be over-diluted and the utilization rate of the buffer solution to decrease.

[0004] Therefore, based on the above situation, it is necessary to design a pH buffer stirring device for the reaction solution of compound synthesis to solve the above problems. Utility Model Content

[0005] This invention provides a pH buffer stirring device for reaction liquid in compound synthesis, which solves the problem in the prior art that the buffer solution is mostly concentrated in the upper layer of the aqueous phase and is difficult to penetrate into the internal region.

[0006] The technical problem solved by this utility model is achieved by the following technical solution: A pH buffer stirring device for a compound synthesis reaction solution includes a reaction vessel and a stirring assembly disposed inside the reaction vessel. The stirring assembly includes a rotating rod rotatably connected inside the reaction vessel and multiple stirring paddles spaced apart along the axial direction of the rotating rod. A motor with its output end connected to one end of the rotating rod is located at the bottom of the reaction vessel. The device also includes a storage tank, a conveying assembly, and a driving assembly. The storage tank is located at the top of the reaction vessel and is sealed to the end of the rotating rod away from the motor. It is used to store the buffer solution to be added. The conveying assembly includes multiple conveying pipes disposed inside the rotating rod. One end of each conveying pipe is connected to the storage tank, and the other end of each conveying pipe extends into the interior of a corresponding stirring paddle. Each stirring paddle has multiple outlet pipes connected to the conveying pipes. The conveying pipes and outlet pipes together form a conveying channel for the buffer solution to flow from the storage tank to different depths of the reaction solution. The driving assembly is used to drive the buffer solution in the storage tank to be conveyed to the interior of the reaction vessel along the conveying pipes.

[0007] Preferably, the drive assembly includes a piston rod that is slidably and sealed inside the storage tank and a telescopic component connected to the piston rod. A support frame connected to the rotating rod is rotatably connected to the reactor. The fixed end of the telescopic component is connected to the inner top of the support frame.

[0008] Preferably, the output end of the storage tank is provided with a one-way valve for unidirectional flow from the storage tank to the delivery pipe, and the storage tank is provided with a connecting pipe for connecting an external buffer replenishment source, and the connecting pipe is provided with a valve.

[0009] Preferably, the outlet tube is provided with a dispersion ball, and the dispersion ball has multiple liquid outlet holes.

[0010] Preferably, the rotating rod is provided with helical blades, which are located below the plurality of stirring paddles.

[0011] Preferably, the outer periphery of the liquid storage tank is connected to the inner wall of the support frame.

[0012] The beneficial effects of this invention are as follows: the buffer solution in the storage tank is driven by the drive component to enter the interior of the reactor through the delivery component. Since multiple delivery pipes extend into the interior of the corresponding stirring paddles, the buffer solution flowing out from the multiple outlet pipes flows into the reaction liquid at different depths. At the same time as the buffer solution flows out, the motor drives the rotating rod to rotate, which enhances the mixing with the reaction liquid and improves the utilization rate of the buffer solution. Attached Figure Description

[0013] To more 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 A three-dimensional structural schematic diagram provided for this utility model; Figure 2 A front view structural schematic diagram provided for this utility model; Figure 3 Schematic diagram of the cross-sectional structure provided by this utility model Figure 1 ; Figure 4 Schematic diagram of the cross-sectional structure provided by this utility model Figure 2 ; Figure 5 A partial structural diagram of the conveying pipe and dispersing ball provided by this utility model.

[0015] In the diagram, 1. Reactor; 2. Stirring assembly; 21. Rotary rod; 22. Stirring paddle; 3. Motor; 4. Storage tank; 5. Delivery pipe; 6. Outlet pipe; 7. Drive assembly; 71. Piston rod; 72. Telescopic component; 8. Support frame; 9. Check valve; 10. Connecting pipe; 11. Valve; 12. Dispersion ball; 13. Liquid outlet; 14. Spiral blade. Detailed Implementation

[0016] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0017] Reference Figures 1-5 As shown, a pH buffer stirring device for a compound synthesis reaction solution includes a reaction vessel 1 and a stirring assembly 2 disposed inside the reaction vessel 1. The reaction solution is pre-introduced into the reaction vessel 1 from its input end. Then, a buffer solution is added to the reaction solution. A storage tank 4 for the buffer solution is located at the top of the reaction vessel 1. As the buffer solution in the storage tank 4 is gradually added to the reaction vessel 1, the stirring assembly 2 thoroughly mixes the two components. The stirring assembly 2 includes a rotating rod 21 rotatably connected inside the reaction vessel 1 and multiple stirring paddles 22 spaced along the axial direction of the rotating rod 21. A motor 3, with its output end connected to one end of the rotating rod 21, is located at the bottom of the reaction vessel 1. Starting the motor 3 causes the rotating rod 21 and stirring paddles 22 to rotate. The stirring paddles 22 penetrate deeper into the reaction solution, mixing the reaction solution at different depths. During this process, to improve the permeability of the buffer solution and enhance the catalytic efficiency of the pH within the reaction solution, the storage tank 4 and... The end of the rotating rod 21 away from the motor 3 is sealed and connected, and multiple delivery pipes 5 are set inside the rotating rod 21, one end of which is connected to the storage tank 4. The other end of the delivery pipes 5 extends into the corresponding stirring paddle 22. Multiple outlet pipes 6 are set on the stirring paddle 22, which are connected to the delivery pipes 5. At this time, the delivery pipes 5 and the outlet pipes 6 together form a delivery channel for the buffer solution to flow from the storage tank 4 to the reaction liquid. A drive assembly 7 can be set on the reaction vessel 1. The drive assembly 7 drives the buffer solution in the storage tank 4 into the delivery pipes 5 and out through the outlet pipes 6. Since the outlet pipes 6 are located at different heights of the stirring paddle 22, the buffer solution flows out into the reaction liquid at different depths. During the process of the buffer solution flowing out of the outlet pipes 6, the motor 3 continuously drives the rotating rod 21 to rotate, causing the stirring paddle 22 and the outlet pipes 6 to make synchronous circular motion. The buffer solution flowing out of the outlet pipes 6 will be quickly thrown out to the outside of the reaction liquid due to centrifugal force, rather than just accumulating near the outlet of the outlet pipes 6, thereby improving the mixing efficiency and increasing the utilization rate of the buffer solution.

[0018] Reference Figure 3 , Figure 4As shown, the drive assembly 7 further employs a drive method that combines a piston rod 71 with a telescopic component 72. The piston rod 71 is slidably connected to the inner cavity of the storage tank 4, and its outer periphery is tightly fitted with the inner wall of the storage tank 4 to form a sealed chamber. The telescopic component 72 can be an electric push rod or a cylinder. Its fixed end is fixed to the inner top of the support frame 8 by bolts, and its movable end is connected to the top of the piston rod 71 via a coupling. When it is necessary to deliver buffer solution into the reactor 1, the telescopic component 72 is activated, and its movable end pushes the piston rod 71 to move downward along the axial direction of the storage tank 4. By squeezing the sealed chamber, pressure is generated in the buffer solution, which then flows along the delivery pipe 5 and the outlet pipe 6 to different depths of the reaction liquid. This drive method can adjust the flow rate of the buffer solution by controlling the advancement speed of the telescopic component 72 to adapt to the addition requirements of different reaction stages. At the same time, the support frame 8 is rotatably connected to the reactor 1 via bearings, and the support frame 8 is fixedly connected to the rotating rod 21 to enhance the vibration resistance of the overall structure.

[0019] The outer periphery of the storage tank 4 can be connected to the inner wall of the support frame 8 by bolts, welding or other means. Under conditions of high-speed rotation of the rotating rod 21, violent stirring in the reaction vessel 1 or high pressure, the storage tank 4 will not be displaced or loosened due to vibration or centrifugal force, thus avoiding interruption of buffer delivery caused by shaking of the storage tank 4. It is suitable for the high-load requirements of continuous industrial production and ensures the overall stability of the telescopic component 72 and the storage tank 4.

[0020] Reference Figure 4 As shown, furthermore, due to the sealed sliding of the piston rod 71 inside the storage tank 4, when the buffer solution in the storage tank 4 needs to be replenished, the telescopic component 72 needs to drive the piston rod 71 to move upward and back. In order to prevent the reaction liquid from being drawn in, a one-way valve 9 is provided at the output end of the storage tank 4. Its valve core only allows the buffer solution to flow from the storage tank 4 to the delivery pipe 5, effectively blocking the reverse flow path. At the same time, the connecting pipe 10 on the side wall of the storage tank 4 can be connected to the external buffer solution storage tank through a hose. When the buffer solution in the storage tank 4 is insufficient, the valve 11 on the connecting pipe 10 is opened. During the process of the telescopic component 72 driving the piston rod 71 to move back, the buffer solution in the external storage tank will be drawn into the storage tank 4, which is suitable for long-term continuous reaction scenarios.

[0021] Reference Figure 5As shown, furthermore, a dispersion ball 12 is integrally formed or threadedly connected to the output end of the outlet tube 6. The dispersion ball 12 can be a hollow spherical structure with multiple liquid outlet holes 13 evenly opened on its surface. The buffer solution first enters the interior of the dispersion ball 12 to form a temporary storage, and then is sprayed out simultaneously through multiple liquid outlet holes 13 to form a multi-point diffusion effect. Combined with the centrifugal force of the rotating rod 21, the buffer solution can be dispersed into droplets with smaller diameters, increasing the contact area with the reaction solution. In the oil-water two-phase reaction, the dispersion ball 12 on the stirring paddle 22 located inside the reaction solution can directly spray the buffer solution to multiple points at the oil-water interface, effectively solving the problem of local pH instability inside the reaction solution in the traditional addition method.

[0022] Reference Figure 3 As shown, a spiral blade 14 is welded to the rotating rod 21 near the bottom of the reactor 1. The rotation direction of the spiral blade 14 is adapted to the rotation direction of the stirring paddle 22. When the rotating rod 21 rotates, the spiral blade 14 can generate an upward axial thrust, pushing the sediment at the bottom of the reactor 1 upward to the action area of ​​the stirring paddle 22. This avoids incomplete local reaction caused by the sediment at the bottom of the reactor not being able to contact the buffer solution. At the same time, the upward flow formed by the spiral blade 14 and the downward flow formed by the stirring paddle 22 can form a circulating flow field in the reactor 1, promoting the exchange and mixing of reaction liquids at different depths and improving the uniformity of the product.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A pH buffer stirring device for a reaction solution used in compound synthesis, comprising a reaction vessel (1) and a stirring assembly (2) disposed inside the reaction vessel (1), wherein the stirring assembly (2) comprises a rotating rod (21) rotatably connected inside the reaction vessel (1) and a plurality of stirring paddles (22) spaced apart along the axial direction of the rotating rod (21), and a motor (3) with its output end connected to one end of the rotating rod (21) is provided at the bottom of the reaction vessel (1), characterized in that, Also includes; Storage tank (4), which is located on top of the reactor (1) and sealed to the end of the rotating rod (21) away from the motor (3), is used to store the buffer solution to be added; The conveying assembly includes multiple conveying pipes (5) disposed inside the rotating rod (21). One end of each conveying pipe (5) is connected to the storage tank (4), and the other end of each conveying pipe (5) extends into the corresponding stirring paddle (22). The stirring paddle (22) is provided with multiple outlet pipes (6) connected to the conveying pipes (5). The conveying pipes (5) and outlet pipes (6) together form a conveying channel for the buffer solution to flow from the storage tank (4) to different depths of the reaction liquid. The driving component (7) is used to drive the buffer solution in the storage tank (4) to be transported along the delivery pipe (5) to the inside of the reactor (1).

2. The pH buffer stirring device for compound synthesis according to claim 1, characterized in that, The drive assembly (7) includes a piston rod (71) that is sealed and slidably connected inside the storage tank (4) and a telescopic component (72) connected to the piston rod (71). A support frame (8) connected to the rotating rod (21) is rotatably connected to the reactor (1). The fixed end of the telescopic component (72) is connected to the inner top of the support frame (8).

3. The pH buffer stirring device for compound synthesis according to claim 1, characterized in that, The output end of the storage tank (4) is provided with a one-way valve (9) that allows one-way flow from the storage tank (4) to the delivery pipe (5). The storage tank (4) is provided with a connecting pipe (10) for connecting an external buffer replenishment source. The connecting pipe (10) is provided with a valve (11).

4. The pH buffer stirring device for compound synthesis according to claim 1, characterized in that, The outlet tube (6) is provided with a dispersion ball (12), and the dispersion ball (12) has multiple liquid outlet holes (13).

5. The pH buffer stirring device for compound synthesis according to claim 1, characterized in that, The rotating rod (21) is provided with a spiral blade (14), which is located below a plurality of stirring paddles (22).

6. The pH buffer stirring device for compound synthesis according to claim 2, characterized in that, The outer periphery of the storage tank (4) is connected to the inner wall of the support frame (8).

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