Liquid feeding system

Abstract

The utility model provides a liquid feeding system. The liquid feeding system comprises a batching unit, a feeding unit and a reaction unit which are connected in sequence, the batching unit comprises a batching kettle, a liquid quantitative controller, an inert gas bottle and a vacuumizing device, the top of the batching kettle is provided with a gas inlet, a feeding port and an extraction port, the gas inlet is communicated with the inert gas bottle through a pipeline I, and the bottom of the batching kettle is provided with a liquid outlet; the feeding unit comprises a feeding tank, a flow regulating valve, a flow meter and a liquid buffer tank; a liquid inlet and a liquid outlet are formed in the feeding tank, the liquid inlet is communicated with the liquid outlet through a pipeline II, and a liquid quantitative controller is arranged on the pipeline II; the liquid outlet is connected to the reaction unit through a pipeline III; the reaction unit comprises a reaction kettle and a dispersing device, the dispersing device is communicated with the liquid buffer tank through a dripping pipe, and a through hole is formed in the bottom of the dispersing tank. The device is simple in structure, air in dropwise added liquid can be effectively removed, continuous constant-speed feeding is realized, and the yield and the purity of products are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of chemical industry device, specifically relates to a liquid feeding system. BACKGROUND

[0002] Germane is an important electronic gas, as one of the important sources of high-purity germanium, mainly applied to the industries such as semiconductor, photovoltaic solar energy and integrated circuit. The existing germane preparation method has the reaction of germanium magnesium and acid (ammonium halide), the reduction of Ge (IV) in aqueous solution by electrolysis, the reduction of germanium dioxide or germanium tetrachloride in solution by reducing agent. Among them, the widely used method for preparing germane in industry is to prepare germane by reducing germanium dioxide with borohydride, and the reaction is liquid-liquid reaction.

[0003] In the existing liquid dropping technology, liquid is generally dropped into the reaction kettle in a point-like manner by drip irrigation, and there are many problems in this way: first, the air in the dropping liquid is not removed, and the oxygen in the air reacts with germane, thereby reducing the yield of germane; Second, drip irrigation can only intermittently drop liquid into the reaction kettle in batches, which cannot meet the continuous multi-batch feeding demand, if liquid is added to the drip irrigation, the closed system will be damaged, and the reaction will be abnormal; Third, the feeding speed of the dropping liquid is difficult to control, which can easily cause the reaction to be violent and abnormal, increase by-products, and thus reduce the yield of germane; Fourth, the dropping liquid has poor dispersibility, and the liquid flows into the reaction kettle in a stream, and the stirring is difficult to disperse the dropping liquid in time, so that the local concentration of the reaction is too high, the by-products increase, and the purity and yield of germane are reduced.

[0004] Therefore, the liquid feeding mode is one of the key factors affecting the yield of germane. Utility model content

[0005] In order to solve the problems existing in the existing liquid feeding technology, the utility model provides a liquid feeding system, which can be specifically used for liquid feeding system in the preparation process of germane. The structure of the feeding system is simple, reasonable in design, can effectively remove the air in the dropping liquid, realize continuous multi-batch and uniform feeding, greatly improve the dispersibility of the dropping liquid, reduce the generation of by-products, and improve the yield and purity of germane.

[0006] In order to realize the purpose of the utility model, the utility model adopts the following technical scheme:

[0007] The utility model provides a kind of liquid feeding system, and the liquid feeding system includes dosing unit, feeding unit and reaction unit connected by pipeline in sequence;

[0008] The dosing unit comprises a dosing kettle, a liquid quantitative controller, an inert gas bottle and a vacuum pumping device, the top of the dosing kettle is provided with an air inlet, a feeding opening and an air outlet, the air inlet is communicated with the inert gas bottle through a pipeline I, the bottom of the dosing kettle is provided with a liquid outlet, and the air outlet is connected to the vacuum pumping device through a pipeline IV;

[0009] The dosing unit comprises a dosing kettle, a liquid quantitative controller, an inert gas bottle and a vacuum pumping device, the top of the dosing kettle is provided with an air inlet, a feeding opening and an air outlet, the air inlet is communicated with the inert gas bottle through a pipeline I, the bottom of the dosing kettle is provided with a liquid outlet, and the air outlet is connected to the vacuum pumping device through a pipeline IV;

[0010] The reaction unit comprises a reaction kettle and a dispersing device arranged in the inner cavity of the reaction kettle, the dispersing device is communicated with the liquid buffer tank through a dropping pipe, and the bottom of the dispersing tank is provided with a plurality of through holes;

[0011] The top of the dosing kettle is communicated with the top of the dosing kettle through a first pressure balance pipe, and the top of the dosing kettle is communicated with the top of the reaction kettle through a second pressure balance pipe.

[0012] In the liquid feeding system provided by the utility model, the pipeline I connected with the dosing kettle extends to the bottom of the dosing kettle, and the distance from the bottom of the dosing kettle is 3-5 cm.

[0013] In the liquid feeding system provided by the utility model, the dosing kettle is further provided with a stirring device.

[0014] In the liquid feeding system provided by the utility model, the dispersing device comprises a first liquid dispersing tank and a second liquid dispersing tank.

[0015] The first liquid dispersing tank and the second liquid dispersing tank are both cylindrical bodies, and the top surfaces of the first liquid dispersing tank and the second liquid dispersing tank are both provided with openings to be communicated with the liquid buffer tank through the dropping pipe.

[0016] In the liquid feeding system provided by the utility model, one end of the dropping pipe is communicated with the liquid buffer tank, and the other end of the dropping pipe is communicated with the dispersing device.

[0017] The angle between one end of the dropping pipe connected with the liquid buffer tank and the vertical direction is 15-20 degrees, and the other end of the dropping pipe is vertically connected with the top surface of the dispersing device.

[0018] In the liquid feeding system provided by this utility model, the volume ratio of the liquid buffer tank to the feeding tank is 1:(25~50).

[0019] In the liquid feeding system provided by this utility model, the bottom diameter ratio of the first liquid dispersion tank and the second liquid dispersion tank to the diameter of the reaction vessel is 1:(6-8).

[0020] In the liquid feeding system provided by this utility model, the first liquid dispersion tank and the second liquid dispersion tank are on the same horizontal plane and are equidistant from the inner wall of the reactor.

[0021] The distance between the first liquid dispersion tank and the inner wall of the reactor is 1:(3-4) to the bottom diameter of the reactor.

[0022] In the liquid feeding system provided by this utility model, the bottom surfaces of the first liquid dispersion tank and the second liquid dispersion tank are each provided with 15 to 25 uniformly distributed through holes.

[0023] In the liquid feeding system provided by this utility model, a first valve is provided on the pipeline;

[0024] A second valve is installed on the first pressure balancing pipe;

[0025] A third valve is installed on the second pressure balancing pipe;

[0026] A fourth valve is installed on the pipeline.

[0027] The technical solution provided by this utility model has the following beneficial effects:

[0028] The liquid feeding system provided by this utility model has a simple structure and reasonable design. It can effectively remove air from the dripping liquid, realize continuous multi-batch, uniform feeding, and improve production efficiency. At the same time, a dispersion unit is added to the reaction unit of the feeding system, which improves the dispersibility of the dripping liquid, reduces the generation of by-products, and improves the yield and purity of the product germane. Attached Figure Description

[0029] Figure 1 The figure shown is a specific embodiment of the liquid feeding system provided by this utility model;

[0030] Figure 2 As shown Figure 1 The bottom surface of the dispersion device;

[0031] Wherein, 1, inert gas bottle, 2, first valve, 3, batching kettle, 3-1, gas inlet, 3-2, feeding port, 3-3, exhaust port, 3-4, liquid outlet, 4, liquid quantitative controller, 5, second valve, 6, first pressure balance pipe, 7, feeding tank, 8, flow regulating valve, 9, flow meter, 10, liquid buffer tank, 11, second pressure balance pipe, 12, third valve, 13, first liquid dropping pipe, 14, second liquid dropping pipe, 15, first liquid dispersion tank, 16, second liquid dispersion tank, 17, reaction kettle, 18, fourth valve, 19, vacuum pump. DETAILED DESCRIPTION

[0032] The specific embodiments of the utility model are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs.

[0034] The utility model provides a kind of liquid feeding system, referring to Figure 1 , including batching unit, feeding unit and reaction unit communicated sequentially by pipeline, wherein, batching unit includes batching kettle 3, liquid quantitative controller 4, inert gas bottle 1 and vacuumizing device, gas inlet 3-1, feeding port 3-2 and exhaust port 3-3 are set in the top of batching kettle 3, the gas inlet 3-1 set in the top of batching kettle 3 is communicated with inert gas bottle 1 by pipeline one, to provide inert environment for feeding system, specifically, inert gas in inert gas bottle 1 can be selected from one of nitrogen, argon, helium. Pipeline one connected in the batching kettle 3 extends to the bottom of the batching kettle 3, and the end of pipeline one that extends into the batching kettle 3 is 3-5cm from the bottom of the batching kettle 3, so that pipeline one can extend below the liquid level of the batching kettle 3, and the air in liquid material liquid is replaced by blowing inert gas into it.

[0035] Liquid outlet 3-4 is set in the bottom of batching kettle 3 to discharge liquid material in kettle from batching kettle 3, and exhaust port 3-3 is connected to vacuumizing device, such as vacuum pump 19, by pipeline four. In specific embodiments, inert gas is introduced into the liquid of batching tank 3 and is replaced by 6-8 times of vacuumizing and purging, to remove the air in the liquid of the batching tank 3, and specific vacuumizing operation can be performed by referring to conventional technical means.

[0036] In some specific embodiments, stirring device can also be installed on the top of batching kettle 3 to accelerate batching process and improve batching efficiency.

[0037] In the liquid feeding system, the feeding unit comprises a feeding tank 7, a flow regulating valve 8, a flow meter 9 and a liquid buffer tank 10; the feeding tank 7 is provided with an inlet on the top and a liquid outlet on the bottom; the inlet is communicated with the liquid outlet 3-4 below the batching kettle 3 through a pipeline II, so as to introduce the liquid in the batching kettle 3 into the feeding tank 7.

[0038] The liquid outlet of the feeding tank 7 is connected to the following reaction unit through a pipeline III; the pipeline III is sequentially connected with the flow regulating valve 8, the flow meter 9 and the liquid buffer tank 10 from the liquid outlet to the reaction unit; in some specific embodiments, the uniform dropping of the liquid in the feeding tank 7 can be realized by controlling the flow regulating valve 8 and observing the change of the indication of the flow meter 9; the dropping speed of the liquid is 0.1-0.5 L / min. The liquid buffer tank 10 is arranged for buffering the liquid to be dropped into the reaction kettle 17, so that the liquid can uniformly flow into the first liquid dropping pipe 13 and the second liquid dropping pipe 14.

[0039] The reaction unit of the feeding system comprises a reaction kettle 17 and a dispersing device arranged in the inner cavity of the reaction kettle 17; the dispersing device is communicated with the liquid buffer tank 10 through a dropping pipe; specifically, the volume ratio of the liquid buffer tank 10 to the feeding tank 7 is 1:(25-50), for example, 1:30, 1:40 or 1:45.

[0040] In some embodiments, the dispersing device comprises a first liquid dispersing tank 15 and a second liquid dispersing tank 16; both the first liquid dispersing tank 15 and the second liquid dispersing tank 16 are cylindrical bodies; the top surface of each of the first liquid dispersing tank 15 and the second liquid dispersing tank 16 is provided with an opening for communicating with the liquid buffer tank 10 through the dropping pipe. Specifically, the top surface opening of the first liquid dispersing tank 15 is communicated with the liquid buffer tank 10 through the first liquid dropping pipe 13, and the top surface opening of the second liquid dispersing tank 16 is communicated with the liquid buffer tank 10 through the second liquid dropping pipe 14.

[0041] In some specific embodiments, one end of the dropping pipe is communicated with the liquid buffer tank 10, and the other end of the dropping pipe is communicated with the dispersing device; specifically, the dropping pipe is in a zigzag shape; the angle between the one end of the dropping pipe connected with the liquid buffer tank 10 and the vertical direction is 15-20°; the other end of the dropping pipe is vertically communicated with the top surface of the dispersing device (i.e. the first liquid dispersing tank 15 and the second liquid dispersing tank 16), so that the liquid in the dropping pipe can vertically enter each dispersing tank.

[0042] In some specific embodiments, the first liquid dispersion tank 15 and the second liquid dispersion tank 16 are dispersion tanks with the same size, and the ratio of the diameter of the bottom surface of the dispersion tank to the diameter of the reactor 17 is 1:(6-8), for example, 1:7. The first liquid dispersion tank 15 and the second liquid dispersion tank 16 are on the same horizontal plane and have the same distance from the inner wall of the reactor 17; the distance between the first liquid dispersion tank 15 / second liquid dispersion tank 16 and the inner wall of the reactor 17 and the diameter of the bottom of the reactor 17 is 1:(3-4).

[0043] In some specific embodiments, as shown in Figure 2 The bottom surface of the first liquid dispersion tank 15 and the second liquid dispersion tank 16 is provided with 15-25 evenly distributed through holes to slowly drop the liquid in the tank into the reactor 17.

[0044] In some embodiments, the first valve 2 is arranged on the pipeline one, the second valve 5 is arranged on the first pressure balance pipe 6, the third valve 12 is arranged on the second pressure balance pipe 11, and the fourth valve 18 is arranged on the pipeline four.

[0045] In the liquid feeding system provided by the utility model, the top of the batching kettle 3 and the top of the feeding tank 7 are communicated through the first pressure balance pipe 6 for balancing the pressure of both, so that the liquid in the batching kettle 3 can smoothly enter the feeding tank 7; the top of the feeding tank 7 and the top of the reactor 17 are communicated through the second pressure balance pipe 11 for balancing the pressure of both, so that the liquid in the feeding tank 7 can smoothly drop into the reactor 17.

[0046] The utility model scheme will be further described below through specific examples, but should not be understood as the utility model is limited to this.

[0047] If the specific experimental steps or conditions are not specified in the examples, the corresponding conventional experimental steps or conditions in the technical field can be used.

[0048] Example 1

[0049] This example uses the liquid feeding system as shown in Figure 1 to prepare germane, wherein the volume ratio of the liquid buffer tank to the feeding tank is 1:40, the included angle between the first liquid dropping pipe and the second liquid dropping pipe and the vertical plane is 15°, the ratio of the diameter of the bottom surface of the first liquid dispersion tank and the second liquid dispersion tank to the diameter of the reactor is 1:6, the bottom surface is uniformly distributed with 19 small holes, and the distance between the first liquid dispersion tank and the second liquid dispersion tank and the inner wall of the reactor and the diameter of the bottom of the reactor is 1:3. The specific operation is as follows:

[0050] (1) Preparation of alkali solution

[0051] The 40L pure water is added into the feeding tank through the feeding port, then 0.5kg of sodium hydroxide is added into the feeding tank, the stirring is opened to make the sodium hydroxide completely dissolved; then 1.2kg of sodium borohydride is added into the feeding tank, the stirring is made to completely dissolve, finally 0.55kg of germanium dioxide is added into the stirring tank, the stirring is made to completely dissolve, and the alkali solution is prepared.

[0052] (2) Purge and replace by vacuum

[0053] The vacuum pump is opened, the stirrer on the feeding tank is opened, the second valve and the third valve are opened, the fourth valve is slowly opened, and the vacuum is extracted to below 5paA; then, the fourth valve is closed, the nitrogen cylinder valve is opened, the first valve is opened, and the nitrogen is slowly introduced into the feeding tank to normal pressure, the fourth valve is opened, and the vacuum is extracted to below 5paA, the purge and replace by vacuum is repeated 6 times, and all the valves are closed.

[0054] (3) The second valve is opened, the liquid quantitative controller is opened, a certain amount of alkali solution is transported into the feeding tank, and the second valve is closed.

[0055] (4) The third valve is opened, the alkali solution in the feeding tank is dropped at a dropping speed of 0.2L / min by controlling the flow regulating valve and observing the number change of the electromagnetic flowmeter, the alkali solution is uniformly dispersed into the reaction tank through the first liquid dispersion tank or the second liquid dispersion tank, until the alkali solution in the feeding tank is completely dropped, then the third valve and the flow metering valve are closed.

[0056] (5) The second valve is opened, the liquid quantitative controller is opened, a certain amount of alkali solution is transported into the feeding tank, and the second valve is closed. The third valve and the flow regulating valve are opened, and the alkali solution is continuously added into the reaction tank.

[0057] (6) The operations of (4) and (5) are repeated until the required amount of alkali solution for the experiment is completely dropped, the dropped alkali solution is reacted with 30L of sulfuric acid (concentration of 1.5mol / L) in the reaction tank, and the reaction temperature is controlled at about 25℃ to prepare germane.

[0058] After collection and analysis, the yield is 95.2%, and the purity is 98.9%.

[0059] Example 2

[0060] This example adopts the method as Figure 1The shown liquid feeding system prepares germane, wherein the volume ratio of the liquid buffer tank to the feeding tank is 1:35, the included angle between the first liquid dropping pipe and the second liquid dropping pipe and the vertical plane is 18°, the ratio of the bottom surface diameter of the first liquid dispersion tank and the second liquid dispersion tank to the diameter of the reaction kettle is 1:7, the bottom surface is uniformly distributed with 21 small holes, the ratio of the distance between the first liquid dispersion tank and the second liquid dispersion tank and the inner wall of the reaction kettle to the diameter of the bottom of the reaction kettle is 1:3.5, and the specific operation is as follows:

[0061] (1) Preparation of alkali solution

[0062] 50L of pure water is added to the feeding kettle through the feeding port, then 0.6kg of sodium hydroxide is added to the feeding kettle, the stirrer is opened, and the sodium hydroxide is completely dissolved by stirring; then 1.5kg of sodium borohydride is added to the feeding kettle, and it is completely dissolved by stirring, finally 0.7kg of germanium dioxide is added to the stirring kettle, and it is completely dissolved by stirring, to prepare the alkali solution.

[0063] (2) Purging and vacuum replacement

[0064] The vacuum pump is started, the stirrer on the feeding kettle is opened, the second valve and the third valve are opened, the fourth valve is slowly opened, and the vacuum is extracted to below 5paA; then, the fourth valve is closed, the nitrogen cylinder valve is opened, the first valve is opened, nitrogen is slowly introduced into the feeding tank to normal pressure, the fourth valve is opened, and the vacuum is extracted to below 5paA, the purging and vacuum replacement is repeated 7 times, and all valves are closed.

[0065] (3) The second valve is opened, a certain amount of alkali solution is delivered to the feeding tank through the liquid quantitative controller, and the second valve is closed.

[0066] (4) The third valve is opened, the alkali solution in the feeding tank is dropped at a dropping speed of 0.3L / min by controlling the flow regulating valve and observing the change of the electromagnetic flowmeter, the alkali solution is uniformly dispersed into the reaction kettle through the first liquid dispersion tank or the second liquid dispersion tank, until the alkali solution in the feeding tank is completely dropped, then the third valve and the flow metering valve are closed.

[0067] (5) The second valve is opened, a certain amount of alkali solution is delivered to the feeding tank through the liquid quantitative controller, and the second valve is closed, the third valve and the flow regulating valve are opened, and the alkali solution is continuously added to the reaction kettle.

[0068] (6) The operations of (4) and (5) are repeated until the required amount of alkali solution is completely dropped, the dropped alkali solution reacts with 40L of sulfuric acid (concentration of 1.5mol / L) in the reaction kettle, the reaction temperature is controlled at about 25℃, and germane is prepared.

[0069] After collection and analysis, the yield is 94.9%, and the purity is 98.5%.

[0070] Example 3

[0071] This example uses a liquid feeding system as shown in Figure 1 to prepare germane, wherein the volume ratio of the liquid buffer tank to the feeding tank is 1:30, the included angle between the first and second liquid dropping pipes and the vertical plane is 15°, the ratio of the bottom surface diameter of the first and second liquid dispersion tanks to the diameter of the reaction kettle is 1:8, the bottom surface is uniformly distributed with 25 small holes, the ratio of the distance between the first and second liquid dispersion tanks and the inner wall of the reaction kettle to the diameter of the bottom of the reaction kettle is 1:4, and the specific operation is as follows:

[0072] (1) Preparation of alkali solution

[0073] 50L of pure water was added to the feeding kettle through the feeding port, then 0.7kg of sodium hydroxide was added to the feeding kettle, the stirrer was turned on to make the sodium hydroxide completely dissolved; then 1.8kg of sodium borohydride was added to the feeding kettle, stirring to make it completely dissolved, finally 0.8kg of germanium dioxide was added to the stirring kettle, stirring to make it completely dissolved, to prepare the alkali solution.

[0074] (2) Purging and vacuum replacement

[0075] The vacuum pump was started, the stirrer on the feeding kettle was turned on, the second and third valves were opened, the fourth valve was slowly opened, and the vacuum was drawn to below 5paA; then the fourth valve was closed, the nitrogen cylinder valve was opened, the first valve was opened, and nitrogen was slowly introduced into the feeding tank to normal pressure, the fourth valve was opened, and the vacuum was drawn to below 5paA, and the purging and vacuum replacement was repeated 8 times, and all valves were closed.

[0076] (3) Open the second valve, open the liquid quantitative controller, and transport a certain amount of alkali solution into the feeding tank, and close the second valve.

[0077] (4) Open the third valve, and through the control of the flow regulating valve and the observation of the number change of the electromagnetic flowmeter, the alkali solution in the feeding tank is dropped at a dropping speed of 0.5L / min, the alkali solution is uniformly dispersed into the reaction kettle through the first or second liquid dispersion tank, until the alkali solution in the feeding tank is completely dropped, then the third valve and the flow metering valve are closed.

[0078] (5) Open the second valve, open the liquid quantitative controller, and transport a certain amount of alkali solution into the feeding tank, and close the second valve, open the third valve and the flow regulating valve, and continue to add the alkali solution into the reaction kettle.

[0079] (6) Repeat (4) and (5) until the required amount of alkali solution for the experiment is completely dropped, the dropped alkali solution reacts with 48L of sulfuric acid (concentration of 1.5mol / L) in the reaction kettle, the reaction temperature is controlled at about 25℃, and germane is prepared.

[0080] Upon analysis of the collected, the yield was 96.3% and the purity was 98.4%.

Claims

1. A liquid feed system characterized by, The liquid feeding system comprises a dosing unit, a feeding unit and a reaction unit connected in sequence through pipelines; The dosing unit comprises a dosing kettle, a liquid quantitative controller, an inert gas bottle and a vacuum pumping device, the top of the dosing kettle is provided with an air inlet, a feeding inlet and an air outlet, the air inlet is communicated with the inert gas bottle through a pipeline one, the bottom of the dosing kettle is provided with a liquid outlet, and the air outlet is connected to the vacuum pumping device through a pipeline four; The feeding unit comprises a feeding tank, a flow regulating valve, a flow meter and a liquid buffer tank, the top of the feeding tank is provided with a liquid inlet and a liquid outlet, the liquid inlet is communicated with the liquid outlet through a pipeline two, the liquid quantitative controller is arranged on the pipeline two, the liquid outlet is connected to the reaction unit through a pipeline three, and the flow regulating valve, the flow meter and the liquid buffer tank are sequentially arranged on the pipeline three from the liquid outlet to the reaction unit; The reaction unit comprises a reaction kettle and a dispersing device arranged in the inner cavity of the reaction kettle, the dispersing device is communicated with the liquid buffer tank through a dropping pipe, and the bottom of the dispersing device is provided with a plurality of through holes; The top of the dosing kettle is communicated with the top of the feeding tank through a first pressure balance pipe, and the top of the feeding tank is communicated with the top of the reaction kettle through a second pressure balance pipe.

2. A liquid feed system according to claim 1, wherein, The pipeline one connected to the dosing kettle extends to the bottom of the dosing kettle, and the distance from the bottom of the dosing kettle is 3-5 cm.

3. A liquid feed system according to claim 2, wherein, The dosing kettle is further provided with a stirring device.

4. A liquid feed system according to claim 3, wherein, The dispersing device comprises a first liquid dispersing tank and a second liquid dispersing tank; The first liquid dispersing tank and the second liquid dispersing tank are both cylindrical bodies, and the top surfaces of the first liquid dispersing tank and the second liquid dispersing tank are both provided with openings to communicate with the liquid buffer tank through the dropping pipe.

5. A liquid feed system according to claim 4, wherein, One end of the dropping pipe is communicated with the liquid buffer tank, and the other end of the dropping pipe is communicated with the dispersing device. The angle between one end of the dropping pipe connected with the liquid buffer tank and the vertical direction is 15-20°, and the other end of the dropping pipe is vertically connected with the top surface of the dispersing device.

6. A liquid feed system according to claim 5, wherein, The volume ratio of the liquid buffer tank to the feeding tank is 1:(25-50).

7. A liquid feed system according to claim 6, wherein The diameter ratio of the bottom surface of the first liquid dispersing tank and the second liquid dispersing tank to the diameter of the reaction kettle is both 1:(6-8).

8. A liquid feed system according to claim 7, wherein, The first liquid dispersing tank and the second liquid dispersing tank are on the same horizontal plane, and the distance from the inner wall of the reaction kettle is equal. The distance between the first liquid dispersing tank and the inner wall of the reaction kettle is 1:(3-4) times the diameter of the bottom of the reaction kettle.

9. A liquid feed system according to claim 8, wherein, The bottom surface of the first liquid dispersing tank and the second liquid dispersing tank is provided with 15-25 evenly distributed through holes.

10. A liquid feed system according to claim 9, wherein, A first valve is arranged on the pipeline one; A second valve is arranged on the first pressure balance pipe; A third valve is arranged on the second pressure balance pipe; A fourth valve is arranged on the pipeline four.

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