Gas-liquid reaction kettle

Abstract

The utility model belongs to the field of chemical equipment discloses a kind of gas-liquid reaction kettle, including kettle body, circulating pipeline, be equipped with agitator in kettle body, gas distribution module is arranged in middle or lower part in kettle body;Pump and venturi tube are equipped on the circulating pipeline, the throat of venturi tube is equipped with gas input port, and the gas input port is communicated with the upper portion in kettle body;The gas distribution module is used to connect external gas source to input external gas.The reaction kettle can provide reflux liquid to kettle by external circulation, and the reflux liquid is mixed with gas in the kettle during reflux process, and after sufficient mixing, it can be sprayed into the kettle, which can improve the gas-liquid exchange effect.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment, and in particular to a gas-liquid reaction vessel. Background Technology

[0002] As core equipment in the chemical, pharmaceutical, and new energy fields, gas-liquid reactors directly affect reaction efficiency, product purity, and production safety. Traditional reactors face three major technical bottlenecks during long-term operation: 1. Low mass transfer efficiency: Conventional aeration devices produce large, unevenly distributed bubbles, resulting in limited gas-liquid contact area. Furthermore, the stirring structure creates mixing dead zones in high-viscosity systems, leading to low reaction rates and high energy consumption; 2. Insufficient sealing reliability: Mechanical seals are prone to wear and leakage under strong corrosive and high-pressure conditions, causing toxic / flammable media to leak, posing safety risks and environmental pollution; 3. Material corrosion failure: Halogen ions and acidic media commonly found in chemical reaction systems easily corrode the reactor body, leading to a sharp reduction in equipment lifespan and frequent downtime for maintenance.

[0003] Of the bottlenecks mentioned above, the first one is the most difficult to solve.

[0004] In order to improve the mass transfer effect, those skilled in the art have continuously proposed new solutions, such as CN222174044U, which is about a low-energy stirring structure for a self-priming reactor, and CN118925628A, which is about a high-efficiency gas-liquid reactor with multi-layer sampling function and aeration device. The above solutions either have low gas-liquid mixing efficiency or complex structure, and both have defects in industrial applications. Utility Model Content

[0005] The purpose of this invention is to provide a gas-liquid reactor that can supply reflux liquid to the reactor through external circulation. During the reflux process, the reflux liquid mixes with the gas inside the reactor and is then sprayed into the reactor after thorough mixing, which can improve the gas-liquid exchange effect. The gas-liquid reactor of this invention has the combined advantages of simple structure and good gas-liquid mixing and exchange effect.

[0006] The specific solution of this utility model is as follows: a gas-liquid reaction vessel, including a vessel body, a circulation pipeline, a stirrer disposed within the vessel body, and a gas distribution module disposed in the middle or lower part of the vessel body; the two ends of the circulation pipeline are respectively connected to the bottom and the top of the vessel body; a pump and a Venturi tube are provided on the circulation pipeline, the inlet of the pump is connected to the bottom of the vessel body, and the outlet of the pump is connected to the inlet end of the Venturi tube; the diffuser section of the Venturi tube is connected to the upper part of the vessel body; a gas inlet is provided at the throat of the Venturi tube, and the gas inlet is connected to the upper part of the vessel body; the gas distribution module is used to connect to an external gas source to input external gas.

[0007] In the aforementioned gas-liquid reactor, the gas inlet is connected to an external gas source and the reactor body in a switchable manner.

[0008] In the aforementioned gas-liquid reactor, there are two Venturi tubes connected in parallel; the gas inlet corresponding to one Venturi tube is connected to an external gas source, and the gas inlet corresponding to the other Venturi tube is connected to the reactor body.

[0009] In the aforementioned gas-liquid reactor, a first valve is provided between the inlet ends of the two venturi tubes and the outlet of the pump.

[0010] In the aforementioned gas-liquid reaction vessel, a pressure sensor is also provided inside the vessel to detect the gas pressure inside the vessel; the detection data of the pressure sensor is used to control the switching of the gas input port.

[0011] In the aforementioned gas-liquid reaction vessel, a pressure sensor for detecting the gas pressure inside the vessel is also provided; the detection data of the pressure sensor is used to control the closing or opening of the first valve.

[0012] In the aforementioned gas-liquid reactor, a second valve is provided between the gas distribution module and the external gas source; the detection data from the pressure sensor is used to control the opening degree of the second valve.

[0013] In the aforementioned gas-liquid reaction vessel, a vertical condenser is provided at the top of the vessel body, and the gas inside the vessel body enters the gas inlet after being condensed by the vertical condenser.

[0014] In the aforementioned gas-liquid reactor, the inner wall of the reactor body is coated with a nano-silica coating; the gas-liquid reactor is a magnetic reactor.

[0015] In the aforementioned gas-liquid reaction vessel, the agitator includes a stirring shaft; the stirring shaft is provided with three layers of stirring blades arranged sequentially from top to bottom; each layer of stirring blades consists of multiple stirring blades; from top to bottom, the length of the stirring blades in each layer of stirring blades gradually increases.

[0016] In this scheme, if the gas-liquid reactor is a magnetic reactor, the stirrer should at least include a magnetic drive system and a stirring shaft. The core components of the magnetic drive system include an inner magnet, an outer magnet, and an isolation sleeve. The inner magnet is installed at the top of the stirring shaft inside the reactor and is made of neodymium iron boron strong magnetic material (magnetic energy product ≥45MGOe). It is wrapped with a corrosion-resistant protective sleeve (such as titanium alloy or polytetrafluoroethylene) to avoid direct contact with the reaction medium. The outer magnet is connected to the motor and drives the inner magnet to rotate through magnetic field force. The number of magnets matches the number of inner magnets to ensure stable torque transmission. The isolation sleeve is a key sealing component between the inner and outer magnets. The material must have both high strength and corrosion resistance (commonly Hastelloy C276 or titanium alloy TA2). The thickness is determined according to the design pressure (usually 3~8mm) to ensure that it is not penetrated by the magnetic field and can withstand the pressure inside the reactor.

[0017] If the gas-liquid reactor is a high-pressure vessel, the agitator should at least include a motor, a reducer, and a stirring shaft; the power of the motor is transmitted to the stirring shaft through the reducer.

[0018] This application has at least the following beneficial effects:

[0019] To improve the gas-liquid mass transfer effect, this invention adopts a gas distribution module inside the vessel combined with external circulation gas-liquid mixing. The gas distribution module provides external gas, and the Venturi tube is used to mix the external circulation liquid and the gas inside the vessel and spray it into the vessel. This is a simple and efficient gas-liquid mass transfer system.

[0020] In a preferred embodiment of this invention, switching between the gas inside the vessel and the external gas source at the gas inlet at the throat of the venturi tube enables gas-liquid mass transfer from different gas sources; alternatively, multiple venturi tubes can be used to handle both the gas-liquid mass transfer of the gas inside the vessel and the gas-liquid mass transfer of the external gas. Furthermore, combining this with an internal pressure sensor allows for intelligent decision-making and switching. When the pressure exceeds a set value, the system switches to gas-liquid mass transfer using both circulating liquid and the gas inside the vessel; conversely, when the pressure falls below the set value, it switches to gas-liquid mass transfer using both circulating liquid and the external gas. This switching method flexibly matches the internal pressure, improving reaction stability and mass transfer efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of Embodiment 1;

[0022] Figure 2 This is a schematic diagram of the structure of Embodiment 2. Detailed Implementation

[0023] The present invention will now be clearly and completely described in conjunction with its embodiments. It should be noted that, in this description, unless specific conditions are specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0024] Example 1

[0025] refer to Figure 1 A gas-liquid reaction vessel includes a vessel body 1, a circulation pipeline 4, a stirrer 2 disposed within the vessel body 1, and a gas distribution module 3 disposed in the middle or lower part of the vessel body 1. The gas distribution module 3 distributes gas through an aeration head, which can be a microporous type with a pore size of 0.2 mm. The two ends of the circulation pipeline are respectively connected to the bottom and the top of the vessel body 1. The circulation pipeline 4 is equipped with a pump 5 and a venturi tube 6. The inlet of the pump is connected to the bottom of the vessel body 1, and the outlet of the pump 5 is connected to the inlet of the venturi tube 6. The pump 5 can draw liquid from the bottom of the vessel body 1 and re-enter the vessel body from the top of the vessel body 1 along the circulation pipeline 4, forming a circulation loop to enhance utilization efficiency. The diffuser section of the venturi tube 6 is connected to the upper part of the vessel body 1. The throat of the venturi tube 6 has a gas inlet 7, which is connected to the top of the vessel body 1. The gas distribution module 3 is used to connect to an external gas source 8 to input external gas.

[0026] During the production process, external gas is introduced into the vessel through the gas distribution module 3 to react with the liquid. At the same time, some unreacted gas accumulates in the upper space of the vessel body 1 to form a gas atmosphere. Pump 5 drives the liquid in the vessel body 1 to enter the Venturi tube 6 through the circulation pipeline 4. The gas atmosphere in the upper space of the vessel body 1 is mixed with the liquid in the Venturi tube 6 through the gas inlet 7 and the throat of the Venturi tube 6 to form a preliminary gas-liquid mixed phase, which is then sprayed into the vessel body 1. In this way, the gas-liquid exchange between the gas and liquid in the vessel can be significantly improved, thereby improving the reaction effect.

[0027] More preferably, the gas inlet 7 is connected in a switchable manner to an external gas source 8 and the gas inside the vessel body 1;

[0028] Specifically, the top of the vessel body 1 is provided with an exhaust pipe 9, and the gas atmosphere formed in the upper space inside the vessel body 1 can be introduced into the gas inlet 7 of the venturi tube 6 through the exhaust pipe 9. A first control valve 10 is provided between the exhaust pipe 9 and the gas inlet 7. An external gas source 8 is connected to the gas inlet 7 through a pipe, and a second control valve 11 is provided on it.

[0029] During the production process, the external gas source 8 is connected to the gas inlet 7 and the gas distribution module 3. There is a third control valve 12 between the gas distribution module 3 and the external gas source 8. The third control valve 12 is an adjustable solenoid valve. The third control valve 12 is kept in a normally open state and controls the switching of the first control valve 10 and the second control valve 11 according to the gas pressure inside the vessel. More specifically, if the gas pressure inside the vessel is too low, it means that the gas raw material has been over-consumed. At this time, the opening of the third control valve 12 increases, the first control valve 10 closes, and the second control valve 11 opens. If the gas pressure inside the vessel is too high, it means that there is too much gas and it needs to react with the liquid as soon as possible. At this time, the opening of the third control valve 12 decreases, the first control valve 10 opens, and the second control valve 11 closes.

[0030] This control method can maintain a stable gas pressure inside the reactor while improving the gas-liquid exchange effect, thus promoting a smooth and rapid reaction.

[0031] In a further preferred embodiment, the vessel body 1 is also provided with a pressure sensor 13 for detecting the air pressure inside the vessel body 1. The opening degree of the third control valve 12, the switching of the first control valve 10 and the second control valve 11 mentioned above are all based on the data of the pressure sensor 13.

[0032] In some preferred embodiments of this example, a vertical condenser 14 is provided on the exhaust pipe 9. The gas inside the vessel is condensed before entering the venturi tube 6, causing some volatile substances to liquefy and flow back into the vessel body 1.

[0033] In a preferred embodiment, the inner wall of the vessel 1 is coated with a nano-silica coating; the stirrer 2 includes a motor 15, a reducer 16, and a stirring shaft 17 connected in sequence; the stirring shaft 17 has three layers of stirring blades arranged sequentially from top to bottom; each layer of stirring blades consists of multiple stirring blades 18; the length of the stirring blades 18 in each layer gradually increases from top to bottom. The stirring blades 18 with progressively increasing length from top to bottom can avoid dead zones and achieve more uniform mixing.

[0034] As is a conventional technique in this field, the vessel body 1 implicitly includes necessary components such as a feed inlet, a discharge outlet, and a heat preservation or temperature control jacket.

[0035] Example 2

[0036] refer to Figure 2The embodiment is largely the same as that in Embodiment 1, except that two venturi tubes 6 are arranged in parallel, and each venturi tube 6 has a gas inlet 7 at its throat. The gas inlet 7 of one venturi tube 6 is connected to an external gas source 8, and the gas inlet 7 of the other venturi tube 6 is connected to an exhaust pipe 9. A fourth control valve 18 and a fifth control valve 19 are respectively provided between the inlet end of the two venturi tubes 6 and the outlet of the pump 5. A sixth control valve 20 is provided between the gas inlet 7 and the external gas source 8, and a seventh control valve 21 is provided between the gas inlet 7 and the exhaust pipe 9.

[0037] The control strategy is the same as in Example 1. If the gas pressure inside the vessel is too low, it indicates that the gas raw material has been over-consumed. At this time, the opening of the third control valve 12 is increased, the fourth control valve 18 and the sixth control valve 20 are opened, and the fifth control valve 19 and the seventh control valve 21 are closed. If the gas pressure inside the vessel is too high, it indicates that there is too much gas and it needs to react with the liquid as soon as possible. At this time, the opening of the third control valve 12 is reduced, the fourth control valve 18 and the sixth control valve 20 are closed, and the fifth control valve 19 and the seventh control valve 21 are opened.

[0038] When pressure sensor 13 is introduced as described in Example 1, the third control valve 12, the fourth control valve 18, the fifth control valve 19, the sixth control valve 20, and the seventh control valve 21 shall perform corresponding actions based on the data from pressure sensor 13.

[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A gas-liquid reaction vessel, characterized in that, The system includes a vessel body, a circulation pipeline, a stirrer installed inside the vessel body, and a gas distribution module installed in the middle or lower part of the vessel body. The two ends of the circulation pipeline are connected to the bottom and top of the vessel body, respectively. A pump and a venturi tube are installed on the circulation pipeline. The inlet of the pump is connected to the bottom of the vessel body, and the outlet of the pump is connected to the inlet of the venturi tube. The diffuser section of the venturi tube is connected to the upper part of the vessel body. A gas inlet is provided at the throat of the venturi tube and is connected to the upper part of the vessel body. The gas distribution module is used to connect to an external gas source to input external gas.

2. The gas-liquid reaction vessel according to claim 1, characterized in that, The gas inlet is connected to an external gas source and the vessel body in a switchable manner.

3. The gas-liquid reaction vessel according to claim 1, characterized in that, The Venturi tubes are two in parallel; the gas inlet of one Venturi tube is connected to an external gas source, and the gas inlet of the other Venturi tube is connected to the inside of the vessel.

4. The gas-liquid reaction vessel according to claim 3, characterized in that, A first valve is installed between the inlet end of each of the two venturi tubes and the outlet of the pump.

5. The gas-liquid reaction vessel according to claim 2, characterized in that, The vessel body is also equipped with a pressure sensor for detecting the gas pressure inside the vessel body; the detection data of the pressure sensor is used to control the switching of the gas input port.

6. The gas-liquid reaction vessel according to claim 4, characterized in that, The vessel body is also equipped with a pressure sensor for detecting the air pressure inside the vessel body; the detection data of the pressure sensor is used to control the closing or opening of the first valve.

7. The gas-liquid reaction vessel according to claim 5 or 6, characterized in that, A second valve is provided between the gas distribution module and the external gas source; the detection data from the pressure sensor is used to control the opening degree of the second valve.

8. The gas-liquid reaction vessel according to any one of claims 1 to 6, characterized in that, A vertical condenser is provided at the top of the vessel body, and the gas inside the vessel body enters the gas inlet after being condensed by the vertical condenser.

9. The gas-liquid reaction vessel according to any one of claims 1 to 6, characterized in that, The inner wall of the vessel is coated with a nano-silica coating; the gas-liquid reactor is a magnetic reactor.

10. The gas-liquid reaction vessel according to any one of claims 1 to 6, characterized in that, The agitator includes a stirring shaft; the stirring shaft is provided with three layers of stirring blades arranged sequentially from top to bottom; each layer of stirring blades consists of multiple stirring blades; from top to bottom, the length of the stirring blades in each layer of stirring blades gradually increases.

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