CN217140400U

CN217140400U - Multi-kettle series gas-liquid countercurrent continuous reaction device

Info

Publication number: CN217140400U
Application number: CN202220959756.9U
Authority: CN
Inventors: 赵建明; 黄宣东; 葛秋伟; 朱国庆
Original assignee: Hangzhou Yuanzheng Engineering Technology Equipment Co ltd
Current assignee: Hangzhou Yuanzheng Engineering Technology Equipment Co ltd
Priority date: 2022-04-24
Filing date: 2022-04-24
Publication date: 2022-08-09
Anticipated expiration: 2032-04-24

Abstract

The application discloses many kettles are established ties gas-liquid and are flowed against current continuous reaction unit, including two at least reation kettle that establish ties and set up, reation kettle's liquid phase feed inlet is higher than liquid phase overflow mouth. The liquid phase feed inlet of the next-stage reaction kettle is connected with the liquid phase overflow port of the previous-stage reaction kettle, and the liquid phase feed inlet of the first-stage reaction kettle is connected with the material pipeline. The liquid phase material flows through the reaction kettles in sequence from the first stage. The reaction kettle is also provided with an air inlet and an air outlet, the air outlet of the next-stage reaction kettle is connected with the air inlet of the previous-stage reaction kettle, the air inlet of the last-stage reaction kettle is connected with a raw material air pipe, and a self-absorption stirring mechanism is arranged in the reaction kettle and is connected with the air inlet through an air suction pipe. The liquid phase material flows through all stages of reaction kettles in sequence under the action of the height difference, and the self-absorption stirring mechanism generates negative pressure to enable the feed gas to flow through all stages of reaction kettles along the direction opposite to that of the liquid phase material. The residence time is increased, and the reaction is more thorough. Meanwhile, power equipment is reduced, and energy consumption is reduced.

Description

Multi-kettle series gas-liquid countercurrent continuous reaction device

Technical Field

The application relates to the technical field of pressure vessels, in particular to a multi-kettle series gas-liquid countercurrent continuous reaction device.

Background

The gas-liquid reaction is a common chemical unit operation, and when the raw material gas is a non-pure gas (for example, a hydrogen fluoride solution of lithium fluoride reacts with a phosphorus pentafluoride gas containing a large amount of hydrogen chloride) or a byproduct gas is generated by the reaction (for example, a liquid aromatic hydrocarbon or alkane reacts with a chlorine gas to generate a hydrogen chloride gas as a byproduct), the raw material gas can be utilized to the maximum extent by the countercurrent contact reaction, and simultaneously, the liquid raw material or the raw material dissolved in the liquid phase can reach the highest conversion rate.

In the prior art, a fixed bed or a packed tower structure is generally adopted as a gas-liquid countercurrent reactor, liquid phase raw materials flow downwards from the top of the reactor by virtue of gravity, and the liquid phase raw materials are uniformly distributed by a filler or a catalyst to form a liquid film in the flowing process. The liquid film and the gas introduced from the bottom of the reactor are subjected to countercurrent contact reaction. The fixed bed or the packed tower can effectively improve the reaction efficiency and fully utilize the raw material gas. However, since the gas is a continuous phase and the liquid is a dispersed phase, the liquid hold-up of the packing or solid catalyst is low and the residence time of the liquid is short. The residence time is often measured in seconds or minutes, and the short residence time cannot meet the requirements of some technological processes which need a long time to react completely.

Therefore, how to provide a technical solution capable of solving the above technical problems is a technical problem which needs to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a multi-kettle series gas-liquid countercurrent continuous reaction device, wherein a liquid phase material is a continuous phase, the retention time is long, and a raw material gas is a dispersed phase. Each reaction kettle is provided with a self-absorption stirring mechanism, the raw material gas is discharged after being circulated for a plurality of times in the reaction kettle while the raw material gas is dispersed, and the gas-liquid mass transfer area is increased to realize the improvement of the reaction rate. The multi-kettle series gas-liquid countercurrent continuous reaction device conveys liquid-phase materials in an overflow mode, the raw material gas flows through all levels of reaction kettles in the direction opposite to that of the liquid-phase materials through the self-absorption stirring mechanism, gas-liquid countercurrent mass transfer and reaction can be realized without additional power equipment (pumps and compressors), the process is simple, the gas-liquid mass transfer is strengthened while multi-level concentration difference is formed, the reaction efficiency is high, the utilization rate of raw materials is high, and the end point is easily reached.

For realizing above-mentioned purpose, the application provides a many cauldrons series connection gas-liquid is continuous reaction unit against current, including two at least reation kettle that establish ties and set up, reation kettle is equipped with liquid phase overflow mouth and liquid phase feed inlet, the liquid phase feed inlet is higher than the liquid phase overflow mouth, the next stage reation kettle's liquid phase feed inlet and last one-level reation kettle's liquid phase overflow mouth links to each other, the first stage reation kettle's liquid phase feed inlet links to each other with the material pipeline, reation kettle still is equipped with air inlet and gas vent, the next stage reation kettle's gas vent and last one-level reation kettle's air inlet links to each other, the last stage the air inlet links to each other with the raw materials trachea, be equipped with in the reation kettle from inhaling rabbling mechanism, from inhaling rabbling mechanism pass through the breathing pipe with the air inlet links to each other.

Preferably, the top of the reaction kettle is provided with a mounting hole, the self-priming stirring mechanism comprises a self-priming stirrer and an air guide cylinder, the air guide cylinder is arranged at the periphery of the mounting hole, a solid shaft of the self-priming stirrer is inserted into the air guide cylinder, and the air guide cylinder is connected with the air inlet through the air suction pipe.

Preferably, the lower end of the solid shaft is connected with the hollow shaft, the lower end of the hollow shaft is provided with a self-suction impeller, and the upper end of the hollow shaft is provided with a gas suction inlet in the gas cylinder.

Preferably, the axial flow paddle of the self-priming agitator is located below the self-priming impeller.

Preferably, the liquid phase feed inlets of all the reaction kettles except the first stage are connected with a sinking pipe, and the outlet of the sinking pipe is positioned below the liquid level.

Preferably, the reaction kettle comprises a shell, a baffle is arranged in the shell, and a built-in heat exchanger is arranged on one side, far away from the side wall of the shell, of the baffle.

Preferably, the number of the reaction kettles is three, and the three reaction kettles are respectively a first-stage reactor, a second-stage reactor and a third-stage reactor.

Preferably, the outer side wall of the lower part of the shell is provided with an outer jacket.

The application provides a many kettles series connection gas-liquid countercurrent continuous reaction device, including two at least reation kettle that establish ties and set up, reation kettle's liquid phase feed inlet is higher than the liquid phase overflow mouth. The liquid phase feed inlet of the next-stage reaction kettle is connected with the liquid phase overflow port of the previous-stage reaction kettle, and the liquid phase feed inlet of the first-stage reaction kettle is connected with the material pipeline. The liquid phase material flows through the reaction kettles in sequence from the first stage. The reaction kettle is also provided with an air inlet and an air outlet, the air outlet of the next-stage reaction kettle is connected with the air inlet of the previous-stage reaction kettle, the air inlet of the last-stage reaction kettle is connected with a raw material air pipe, and a self-absorption stirring mechanism is arranged in the reaction kettle and is connected with the air inlet through an air suction pipe.

The liquid phase material flows through all stages of reaction kettles in sequence under the action of the height difference, and the self-absorption stirring mechanism generates negative pressure to enable the feed gas to flow through all stages of reaction kettles along the direction opposite to that of the liquid phase material. Liquid phase materials are conveyed in an overflow mode, so that the retention time is prolonged, and the reaction is more thorough. Meanwhile, power equipment is reduced, and energy consumption is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a multi-kettle series gas-liquid countercurrent continuous reaction device provided by the application.

Wherein the reference numerals in fig. 1 are:

the device comprises a primary reactor 1, an outer jacket 2, an internal heat exchanger 3, a baffle 4, a shell 5, a self-suction impeller 6, a hollow shaft 7, a liquid level 8, a liquid phase overflow port 9, a gas guide cylinder 10, a gas suction port 11, a solid shaft 12, a gas inlet 13, a self-suction stirrer 14, a speed reducer 15, a motor 16, a sealing part 17, a gas outlet 18, a liquid phase feed inlet 19, an axial flow paddle 20, a secondary reactor 21 and a tertiary reactor 22.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In order to enable those skilled in the art to better understand the scheme of the present application, the present application will be described in further detail with reference to the accompanying drawings and the detailed description.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a multi-kettle series gas-liquid countercurrent continuous reaction apparatus provided in the present application.

The multi-kettle series gas-liquid countercurrent continuous reaction device provided by the application has a structure as shown in figure 1 and comprises at least two reaction kettles which are arranged in series. The reaction kettle comprises a closed shell 5, and the shell 5 is provided with a liquid phase overflow port 9, a liquid phase feed port, an air inlet 13 and an air outlet 18. Wherein, the liquid phase feed inlet is higher than the liquid phase overflow port 9, the liquid phase feed inlet of the next-stage reaction kettle is connected with the liquid phase overflow port 9 of the previous-stage reaction kettle, and the liquid phase feed inlet of the first-stage reaction kettle is connected with the material pipeline. Liquid phase materials enter the first-stage reaction kettle through a material pipeline, and flow into the next-stage reaction kettle through a liquid phase feed inlet of the next-stage reaction kettle after the liquid level reaches a liquid phase overflow port 9. The liquid phase material flows through the reaction kettles at different levels in sequence.

The reaction kettle is internally provided with a self-absorption stirring mechanism, the self-absorption stirring mechanism is connected with an air inlet 13 in the shell 5 through an air suction pipe, an air outlet 18 of the next-stage reaction kettle is connected with the air inlet 13 of the previous-stage reaction kettle, and the air inlet 13 of the last stage is connected with a raw material air pipe. The raw material gas flows into the self-priming stirring mechanism through the air suction pipe, and the self-priming stirring mechanism is operated to send the raw material gas below the liquid level 8 to be mixed and reacted with the liquid-phase material. The unreacted raw gas enters the upper-stage reaction kettle through the exhaust port 18.

Optionally, the liquid-phase feed inlets of all the reactors except the first stage are connected with sinking pipes, as shown in fig. 1, the sinking pipes are bent downward, and outlets of the sinking pipes are located below the liquid level 8. The liquid phase material is directly introduced below the liquid level 8 through the sinking pipe, so that the gas phase short circuit is avoided.

In this embodiment, the liquid phase material flows to the last stage reation kettle from the first stage reation kettle, and the feed gas flows to the first stage reation kettle from the last stage reation kettle, and two kinds of material counterflow of gas-liquid can improve the reaction depth, make the material fully react. In addition, the liquid phase materials flow through the reaction kettles in sequence under the drive of gravity, the self-absorption stirring mechanism provides power for the raw material gas and mixes the raw material gas with the liquid phase materials, and the raw material gas is discharged after being circulated for a plurality of times in the reaction kettles, so that the reaction efficiency is improved. The multi-kettle series gas-liquid countercurrent continuous reaction device has lower energy consumption and is beneficial to improving the enterprise benefit.

One embodiment of the present application, as shown in fig. 1, includes three reaction vessels, which are a first-stage reactor 1, a second-stage reactor and a third-stage reactor 22. Three reaction kettles are connected in series to enable the liquid-phase material and the raw material gas to fully react, and of course, a user can also set the stage number of the reaction kettles according to needs, and the limitation is not made here.

Optionally, a mounting hole is formed in the top of the housing 5, the self-priming stirring mechanism comprises a self-priming stirrer 14 and an air guide cylinder 10, and the air guide cylinder 10 is located in the housing 5 and is arranged on the periphery of the mounting hole. The mounting hole outside is equipped with the mount pad, and self-priming mixer 14 sets up in the mount pad, still is equipped with sealing member 17 in the mount pad, avoids the feed gas to leak from the mount pad. The solid shaft 12 of the self-priming agitator 14 is inserted into the gas cylinder 10. The motor 16 is arranged above the mounting seat, and the motor 16 is connected with the self-suction type stirring machine 14 through a speed reducer 15 so as to drive the self-suction type stirring machine 14 to rotate. The gas cylinder 10 is connected with the gas inlet 13 through the gas suction pipe, and the self-priming agitator 14 can suck the raw gas into the gas cylinder 10 when rotating.

Optionally, the lower end of the solid shaft 12 is connected with the hollow shaft 7, the joint of the solid shaft and the hollow shaft is located in the gas cylinder 10, the upper end of the hollow shaft 7 is further provided with a gas suction inlet 11 located in the gas cylinder 10, and the lower end of the hollow shaft 7 is provided with a self-suction impeller 6. The self-suction impeller 6 rotates along with the solid shaft 12, can throw out the feed gas by utilizing centrifugal force, and simultaneously generates negative pressure to suck the feed gas into the hollow shaft 7. In addition, the self-suction impeller 6 can break up the feed gas to form fine bubbles through high-speed rotation, the contact area between the fine bubbles and liquid-phase materials can be increased, and the reaction efficiency is improved.

Optionally, the gas cylinder 10 has a vent hole at its lower end. When the self-suction stirrer 14 operates at the rotating speed of 400-1500 rpm, gas discharged from the top of the reaction kettle sequentially passes through the gas suction inlet 11, the hollow shaft 7 and the self-suction impeller 6 to be sucked under the liquid surface 8 for dispersion and reacts with materials in a liquid phase, part of the reacted gas is discharged from the gas discharge outlet 18, and the other part of the reacted gas enters the gas guide cylinder 10 to be sucked under the liquid again for reaction. Under the operation condition, the suction amount of the self-suction impeller 6 must be larger than the flow rate of the raw material gas entering the reaction kettle, otherwise, a part of the raw material gas is discharged without reaction. Generally, the air suction amount of the self-suction impeller 6 under the operation condition can be several times of the air flow entering the reactor, and the raw material gas can be discharged after being circulated in the reactor for several times, so that the improvement of the gas content in the liquid-phase material is facilitated, the reaction rate is higher, and the utilization rate of the raw material gas is higher.

Optionally, the axial flow impeller 20 of the self-priming blender 14 is located below the self-priming impeller 6. The axial flow paddle 20 can also generate a driving force towards the bottom of the reaction kettle, and the liquid phase material flows towards the bottom of the reaction kettle under the driving force. Bubbles are often entrained in the liquid-phase material, so that the raw material gas is further pushed to be mixed with the liquid-phase material, and the reaction time is prolonged.

Optionally, a baffle 4 is arranged in the shell 5, the side, away from the side wall of the shell 5, of the baffle 4 is provided with the built-in heat exchanger 3, and the built-in heat exchanger 3 can control the reaction temperature. The structure of the built-in heat exchanger 3 can be referred to the prior art. The outer side wall of the lower part of the shell 5 is provided with an outer jacket 2, and the outer jacket 2 can keep the temperature of the reaction kettle and protect the reaction kettle.

In this embodiment, the self-priming stirring mechanism includes hollow shaft 7 and self-priming impeller 6, and the two rotate under the drive of solid shaft 12, break up the material simultaneously, make the feed gas form tiny bubble and mix with the liquid phase material, improved the area of contact of feed gas and liquid phase material, improved reaction efficiency.

It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.

The multi-kettle series gas-liquid countercurrent continuous reaction device provided by the application is described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

Claims

1. A multi-kettle series gas-liquid countercurrent continuous reaction device is characterized by comprising at least two reaction kettles which are arranged in series, the reaction kettle is provided with a liquid phase overflow port (9) and a liquid phase feed inlet (19), the liquid phase feed inlet (19) is higher than the liquid phase overflow port (9), the liquid phase feed inlet (19) of the next stage of reaction kettle is connected with the liquid phase overflow port (9) of the previous stage of reaction kettle, the liquid phase feed inlet (19) of the first stage of reaction kettle is connected with a material pipeline, the reaction kettle is also provided with an air inlet (13) and an air outlet (18), the air outlet (18) of the next stage of reaction kettle is connected with the air inlet (13) of the previous stage of reaction kettle, the air inlet (13) of the last stage is connected with a raw material air pipe, and a self-suction stirring mechanism is arranged in the reaction kettle and is connected with the air inlet (13) through an air suction pipe.

2. The gas-liquid countercurrent continuous reaction device with multiple reactors connected in series according to claim 1, wherein the top of the reaction vessel is provided with a mounting hole, the self-priming stirring mechanism comprises a self-priming stirrer (14) and a gas cylinder (10), the gas cylinder (10) is arranged at the periphery of the mounting hole, a solid shaft (12) of the self-priming stirrer (14) is inserted into the gas cylinder (10), and the gas cylinder (10) is connected with the gas inlet (13) through the gas suction pipe.

3. The multi-kettle series gas-liquid countercurrent continuous reaction device according to claim 2, wherein the lower end of the solid shaft (12) is connected with a hollow shaft (7), the lower end of the hollow shaft (7) is provided with a self-suction impeller (6), and the upper end of the hollow shaft (7) is provided with a gas suction inlet (11) positioned in the gas cylinder (10).

4. The multi-kettle series gas-liquid countercurrent continuous reaction device according to claim 3, characterized in that the axial flow paddle (20) of the self-priming agitator (14) is located below the self-priming impeller (6).

5. The gas-liquid countercurrent continuous reaction apparatus with multiple reactors connected in series according to claim 4, wherein the liquid phase feed inlets (19) of all the reactors except the first stage are connected with a sinking pipe, and the outlet of the sinking pipe is positioned below the liquid level (8).

6. A multi-kettle series gas-liquid countercurrent continuous reaction device according to any one of claims 1 to 5, characterized in that the reaction kettle comprises a shell (5), a baffle (4) is arranged in the shell (5), and a built-in heat exchanger (3) is arranged on one side of the baffle (4) far away from the side wall of the shell (5).

7. The continuous gas-liquid countercurrent reaction device with multiple cascaded kettles according to any one of claims 1 to 5, wherein there are three reaction kettles, and the three reaction kettles are respectively a primary reactor (1), a secondary reactor (21) and a tertiary reactor (22).

8. The gas-liquid countercurrent continuous reaction device with multiple kettles connected in series according to claim 6, wherein the outer side wall of the lower part of the shell (5) is provided with an outer jacket (2).