CN104607131B - A kind of continuous stream rotary shaft reactor and its application - Google Patents

Abstract

The invention discloses a continuous flow rotating shaft reactor, which includes a power device and a reactor body; the reactor body includes a shell, a jacket and a rotating shaft, and a jacket is arranged inside the shell, and the jacket surrounds the rotating shaft , the cavity between the rotating shaft and the jacket is a reaction space; the housing is provided with at least two material inlets and at least one product outlet leading to the reaction space; At least one heat medium inlet and at least one heat medium outlet of the sleeve; the rotating shaft is connected with the output shaft of the power device. The invention can realize precise temperature control, full mixing and stirring of materials; has the advantages of uniform mixing, high product purity, large output, strong versatility, simple structure and operation, etc. Long material multiphase flow (gas-liquid, liquid-liquid, gas-liquid-solid) reaction system.

Description

A Continuous Flow Rotary Shaft Reactor and Its Application

technical field

The invention relates to a continuous flow rotating shaft reactor and its application, in particular to a rotating shaft reactor capable of precise temperature control and sufficient mixing and stirring and its reaction in multiphase flow (gas-liquid, liquid-liquid, gas-liquid solid) system applications. It is especially suitable for multiphase flow reactions with large specificity, high viscosity, easy precipitation and long residence time, and belongs to the field of high gravity technology.

Background technique

Hypergravity technology is a high-tech technology produced in an environment much greater than the earth's gravitational acceleration (9.8m/s ² ). Rotating packed bed (ie high gravity machine, RPB) is the core equipment to realize high gravity technology, and it is also a new type of equipment that enhances interphase mass transfer and multiphase mixing. As early as 1983, the British Imperial Chemical Industries Company successfully applied the rotating packed bed to the rectification operation. After 30 years of development, high-gravity technology has expanded to many fields, and its research at home and abroad has progressed rapidly. It has been successfully applied to oilfield water injection deoxidation, boiler water deoxidation, nano-powder preparation, flue gas desulfurization, and biological oxidation reactions. and dust removal processes.

The gas-liquid, liquid-liquid or gas-solid mass transfer of materials in the high-gravity equipment is carried out in a high-gravity field that is dozens of times stronger than the gravity. Under the high-gravity field, the material microelements are torn into micron or nanoscale The mass transfer and mixing process is greatly enhanced, making its mass transfer capacity at least three times that of a tank reactor, and its mixing capacity at least seven times that of a tank reactor.

In modern chemical production, mixing plays an important role in the processing of chemical products. Mixing equipment also emerges in endlessly, but they can usually be classified into two categories: 1. Mixing is completed by moving mechanical parts, such as mechanical stirring tank and rotor stirring; 2. Mixing by fixed mechanical parts, such as static mixers, jets, bubbling beds, trays. Among them, the stirred tank reactor is still the most common and convenient mixing equipment used in chemical plants. The stirred tank reactor is suitable for the reaction process of various physical properties (such as viscosity, density) and various operating conditions (such as temperature and pressure). There are hundreds of types of stirred tank reactors used in industry. The choice of agitator type and size, rotational speed and method of operation depends on the results each operation will produce. For example, it is better to use a large-diameter, low-speed agitator for some operations; while another operation requires a small-diameter, fast paddle, which results in the need to replace different types of agitators when producing different products, resulting in cumbersome operations and poor versatility. . In the processing of some food or medicine, it is often necessary to add some additives to the mother liquor, and then stir and heat. In the whole process, the feeding, stirring and temperature have strict control parameters, and the existing equipment has high cost. , complex control and other issues, it is not suitable for small processing enterprises, especially those with limited operating places. In addition, the composition will also change during the cooling process of the product, which may affect the purity, particle size and distribution of the product. Most stirred tanks cannot evenly stir materials with large specific gravity, high viscosity, and easy sedimentation, and cannot fully mix and react the materials, so that the production requirements cannot be met.

Contents of the invention

The first technical problem to be solved by the present invention is to provide a continuous flow rotating shaft reactor. The reactor can evenly stir the materials with high specific gravity, high viscosity and easy precipitation, and can make the materials fully mixed and reacted, so as to meet the production requirements.

The second technical problem to be solved by the present invention is to provide an application of the above-mentioned continuous flow rotary shaft reactor in a multiphase flow reaction process.

In order to solve the above-mentioned first technical problem, the present invention provides a continuous flow rotating shaft reactor, comprising a power unit and a reactor body;

The reactor body includes a shell, a jacket and a rotating shaft, a jacket is arranged inside the shell, the jacket surrounds the rotating shaft, and the cavity between the rotating shaft and the jacket is a reaction space;

The housing is provided with at least two material inlets and at least one product outlet leading to the reaction space; the housing is also provided with at least one heat medium inlet and at least one heat medium outlet leading to the jacket;

The rotating shaft is connected with the output shaft of the power device.

Preferably, the rotating shaft is installed horizontally.

Preferably, the surface of the rotating shaft is smooth.

Preferably, the surface of the rotating shaft is provided with guide threads, and the inner wall of the jacket is provided with static guide threads; it is helpful for the reaction between materials to mix evenly, and it is also convenient to control the time of materials in the reaction space Wait.

Preferably, the ratio L:D of the length of the rotating shaft to the radius of the cross section ranges from 5:1 to 40:1, and preferably ranges from 5:1 to 20:1.

Preferably, a seal is provided between the rotating shaft and the housing to prevent leakage of materials.

Preferably, the cross-sectional inclination angle of the thread is in the range of 1-30°; more preferably, the inclination angle of the cross-section of the thread is in the range of 1-15°, which helps to mix the materials uniformly.

Preferably, a material inlet is provided symmetrically up and down on the end close to the power device of the housing, and a product outlet is provided on the upper part of the end away from the power device.

Preferably, the product outlet is connected to a separation and purification device; the separation and purification device is a centrifuge or a dryer.

In order to solve the above-mentioned second technical problem, the application of a continuous flow rotary shaft reactor in the multiphase flow reaction process of the present invention comprises the following steps:

1) Transport the first liquid raw material to the continuous flow rotary shaft reactor, enter from the first material inlet on the upper part of the shell, and transport it into the reaction space;

2) Send heat medium into the jacket to heat the continuous flow rotating shaft reactor;

3) The second raw material is transported to the continuous flow rotating shaft reactor, enters from the second material inlet at the lower part of the shell, and is transported into the reaction space;

4) Start the continuous flow rotary shaft reactor, the first liquid raw material and the second raw material are fully reacted and mixed in the reactor; the final material is discharged from the product outlet.

Preferably, the second raw material includes one or two of gas, liquid or solid.

Preferably, the rotational speed of the rotating shaft is 10-2000 rpm, and the temperature of the heat medium is -50-500°C; more preferably, the rotational speed of the rotating shaft is 20-1200 rpm, and the temperature of the heat medium is preferably -40-350°C.

The present invention has following beneficial effect:

The invention provides a rotating shaft reactor device. By setting a jacket and under the action of strong centrifugal force of the shaft, it can realize precise temperature control, fully mixing and stirring of materials, and has the advantages of uniform mixing, high product purity, large output, and versatility. Strong, simple structure and operation, etc., especially suitable for multiphase flow (gas-liquid, liquid-liquid, gas-liquid-solid) reaction systems of materials with large specificity, high viscosity, easy precipitation, and long residence time.

Description of drawings

Fig. 1 is a schematic structural view of a rotating shaft reactor device of the present invention;

Fig. 2 is a schematic flow diagram of the multiphase flow reaction process of the rotary axis reactor of the present invention;

in:

1-shell, 2-power device, 3-first material inlet, 4-heat medium outlet, 5-rotary shaft,

51- diversion thread, 6- jacket, 61- static diversion thread, 7- product outlet, 8- heat medium inlet,

9-second material inlet, 10-seal, 11-pump, 12-raw material tank, 13-gas-liquid separator,

14-storage tank, 15-support.

detailed description

Embodiments of the present invention will be further described below in conjunction with the accompanying drawings and examples. However, the invention is not limited to the listed examples.

Example 1

A continuous flow rotating shaft reactor, comprising a power unit 2 and a reactor body;

The power unit 2 is a motor;

The reactor body includes a shell 1, a jacket 6 and a rotating shaft 5. A jacket 6 is set inside the housing 1, and the jacket 6 surrounds the rotating shaft 5. The space between the rotating shaft 5 and the jacket 6 is The cavity is a reaction space 50;

A first material inlet 3 is provided on the upper part of the housing 1 close to the power device 2, a second material inlet 9 is provided on the symmetrical lower part, and a product outlet 7 is provided on the upper part of the housing 1 away from the power device 2;

The rotating shaft 5 is connected to the output shaft of the power unit 2; the rotating shaft 5 is installed horizontally; and the reactor and the power unit are all arranged on the support 15;

The 5-axis surface of the rotating shaft is smooth;

A seal 10 is provided between the rotating shaft 5 and the housing 1 to prevent material leakage;

The ratio L:D of the length of the rotating shaft to the radius of the cross section is in the range of 5:1 to 40:1, preferably in the range of 5:1 to 20:1;

The first material inlet 3 on the upper part of the housing 1 inputs liquid raw materials, and the second material inlet 9 on the lower part of the housing inputs one or both of gas, liquid or solid;

The product outlet 7 is connected to a centrifuge or a dryer;

Referring to Fig. 1, a further improved embodiment, the shaft surface of the rotating shaft 5 is provided with a guide thread 51, and the inner wall of the jacket is provided with a static guide thread 61; it is helpful for the reaction and mixing between materials Even, it is also convenient to control the time of the material in the reaction space; the cross-sectional inclination angle of the thread ranges from 1-30° (that is, the angle between the center line of the thread and the longitudinal axis of the rotation axis); further improved In an embodiment, the inclination angle of the cross-section of the screw thread is in the range of 1-15°, which is helpful for the reaction and mixing of the materials to be uniform.

Example 2

Referring to shown in Fig. 2, the application of a kind of continuous flow rotary axis reactor of the present invention in the multiphase flow reaction process, take gas-liquid reaction LiOH and CO The reaction production Li _{2 CO 3} is example:

The ratio of the length of the rotating shaft to the radius of the cross section used in the experiment is 10:1, and the rotating shaft reactor with a cavity volume of 50 L puts the LiOH solution in the raw material tank 12, and the solution will be pumped into the tank at 20 L/h with a volume of In the cavity of the 50L rotating shaft reactor, the pH value is adjusted to 9, and at the same time, _CO2 gas is passed into the cavity of the rotating shaft reactor at a flow rate of 25L/h, and the speed of the rotating shaft is adjusted to 500rpm. The gas and liquid are fully contacted under the action of the guide thread of the rotating shaft, and the mixed precipitate is passed into the centrifuge for dehydration and washing, and then passed into the drying tank to adjust the temperature at 160°C for 2 hours to dry, and finally the purity of Li ₂ CO ₃ is 99.00%.

Example 3

Referring to Fig. 2, the application of a continuous flow rotary shaft reactor of the present invention in the multiphase flow reaction process, taking the gas-liquid reaction LiOH and CO ₂ reaction to produce Li ₂ CO ₃ as an example

The ratio of the length of the rotating shaft to the radius of the cross section used in the experiment is 10:1, and the rotating shaft reactor with a cavity volume of 50L puts the LiOH solution in the raw material tank, and the solution will be pumped into the 50L reactor at a rate of 12L/h by the action of the pump. In the chamber of the rotating shaft reactor, the pH value was adjusted to 10, and at the same time, CO ₂ gas was passed into the chamber of the rotating shaft reactor at a flow rate of 15 L/h, and the speed of the rotating shaft was adjusted to 400 rpm. The gas and liquid are fully contacted under the action of the guide thread of the rotating shaft, and the mixed precipitate is passed into the centrifuge for dehydration and washing, and then passed into the drying tank to adjust the temperature at 160°C for 2 hours to dry, and finally the purity of Li ₂ CO ₃ is 99.20%.

Example 4

Referring to Fig. 2, the application of a continuous flow rotary axis reactor in the multiphase flow reaction process of the present invention is illustrated by the liquid-liquid reaction of LiCl and Na ₂ CO ₃ to generate Li ₂ CO ₃ .

The ratio of the length of the shaft to the radius of the cross section used in the experiment is 10:1, and the volume of the cavity is 50L. The LiCl solution is placed in the raw material tank, and LiCl is pumped into the cavity of the 50L rotary shaft reactor at 20L/h. Pump in 5 mol/L Na ₂ CO ₃ at 20 L/h, adjust the pH value to 9.5, and adjust the rotation speed to 650 rpm for the reaction. Pass the mixed precipitate into the filter, and finally obtain Li ₂ CO ₃ with a purity of 98.5%.

Example 5

Referring to Fig. 2, the application of a continuous flow rotary shaft reactor in the multiphase flow reaction process of the present invention is taken as an example of the liquid-solid reaction of LiOH and NH ₄ HCO ₃ to Li ₂ CO ₃ .

The ratio of the length of the shaft to the radius of the cross section used in the experiment is 10:1, and the volume of the cavity is 50L. The LiOH solution is placed in the raw material tank, and 20L of the LiOH solution is pumped into the cavity of the 50L rotary shaft reactor. Put 60°C water into the jacket, then add 10Kg NH ₄ HCO ₃ into the rotating shaft, adjust the rotation speed to 700rpm, pass the mixed precipitate into the drying tank, adjust the temperature to 150°C and dry for 2 hours, the obtained Li ₂ CO ₃ has a purity of 99.10 %.

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. All the implementation manners cannot be exhaustively listed here. All obvious changes or variations derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims (11)

1. a kind of continuous stream rotary shaft reactor, including power set and reactor body, it is characterised in that：

The reactor body includes housing, chuck and rotary shaft, and chuck is set in the housing, and the chuck surrounds rotary shaft, the rotation Cavity between rotating shaft and chuck is reaction compartment；

The housing, which is provided with, leads at least two material inlets of reaction compartment and at least one product exit；On the housing It is additionally provided with least one thermal medium inlet for leading to chuck and at least one thermal medium outlet；

The output axis connection of the rotary shaft and power set；

One end of close power set is symmetrical above and below on the housing is respectively equipped with a material inlet, and one away from power set End top is provided with a product exit；

The rotary shaft axle surface is provided with water conservancy diversion screw thread, and the chuck madial wall is provided with static water conservancy diversion screw thread；

The cross section tilt angle ranges of the water conservancy diversion screw thread and static water conservancy diversion screw thread are 1-15 °.

2. continuous stream rotary shaft reactor according to claim 1, it is characterised in that：The rotary shaft is horizontal installation.

3. continuous stream rotary shaft reactor according to claim 1, it is characterised in that：The rotary shaft axle surface is smooth.

4. continuous stream rotary shaft reactor according to claim 3, it is characterised in that：The length of the rotary shaft with it is transversal Radius surface compares L：D scopes are 5：1~40：1.

5. continuous stream rotary shaft reactor according to claim 4, it is characterised in that：The length of the rotary shaft with it is transversal Radius surface compares L：D scopes are 5：1~20：1.

6. continuous stream rotary shaft reactor according to claim 1, it is characterised in that：Set between the rotary shaft and housing There is sealing.

7. continuous stream rotary shaft reactor according to claim 1, it is characterised in that：The product exit connection separation carries Pure equipment；The separating-purifying equipment is centrifuge or drier.

8. application of a kind of continuous stream rotary shaft reactor in multiphase flow course of reaction, it is characterised in that comprise the following steps：

1) the first liquid charging stock is transported to continuous stream rotary shaft reactor, entered from the first material import of housing upper, it is defeated It is sent in reaction compartment；

2) continuous stream rotary shaft reactor is heated toward conveying thermal medium in chuck；

3) by the second feedstock transportation to continuous stream rotary shaft reactor, enter from the second material import of lower housing portion, be transported to In reaction compartment；

4) continuous stream rotary shaft reactor is started, the first liquid charging stock and the fully reaction mixing in reactor of the second raw material are equal It is even；Final material is discharged from product exit.

9. application according to claim 8, it is characterised in that：Second raw material is one kind or two in gas, liquid or solid Kind.

10. application according to claim 8, it is characterised in that：The rotary shaft rotating speed is 10~2000rpm, thermal medium Temperature is -50~500 DEG C.

11. application according to claim 8, it is characterised in that：20~the 1200rpm of rotary shaft rotating speed, thermal medium temperature Preferably -40~350 DEG C of degree.