CN111359565A - Microwave reaction kettle with kneader - Google Patents
Microwave reaction kettle with kneader Download PDFInfo
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- CN111359565A CN111359565A CN202010269945.9A CN202010269945A CN111359565A CN 111359565 A CN111359565 A CN 111359565A CN 202010269945 A CN202010269945 A CN 202010269945A CN 111359565 A CN111359565 A CN 111359565A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
- B01J19/12—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electromagnetic waves
- B01J19/122—Incoherent waves
- B01J19/126—Microwaves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
- B01J2219/00139—Controlling the temperature using electromagnetic heating
- B01J2219/00141—Microwaves
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Abstract
The invention discloses a microwave reaction kettle with a kneader, which consists of two parts, wherein one part is a material kneading device, and the other part is a microwave radiation device; the material kneading device is also used as a microwave reaction cavity, a plurality of kneading cutter discs are arranged in the material kneading device, the kneading cutter discs are positioned at the bottom of the cavity, the bottom of the whole reaction cavity is in a W double-arc structure, the radian is attached to the motion trail of the kneading cutter discs, so that sufficient kneading of materials can be ensured, the kneading cutter discs are connected through a cutter disc transmission shaft, and transmission power is provided by a motor; the microwave radiation device is positioned on a top cover of the reaction cavity, a microwave radiator is arranged at the center of the top cover, and microwave energy is radiated outwards in a monopole antenna mode; the top cover is provided with an infrared temperature measuring device which can measure the reaction temperature in real time. The invention solves the problem that the materials cannot be kneaded in real time in the microwave heating process, has simple operation and can control the reaction temperature according to the reaction temperature requirement.
Description
Technical Field
The invention relates to chemical equipment, in particular to a microwave reaction kettle.
Background
With the continuous development of science and technology, microwave energy is used as a novel efficient clean energy source to be applied more and more in various fields such as food processing, chemical engineering, medicines and the like. Compared with the traditional heating method, the microwave heating has the characteristics of high efficiency, energy conservation, selective heating, cleanness, no pollution and the like. Microwave heating is widely used in many fields today. Microwave radiation is carried out on the condensation reaction of alpha naphthaldehyde and diethyl malonate, the traditional heating time is shortened to 3 per thousand of the original heating time by using microwaves, and the energy consumption is reduced by 95 percent. The ammonium polyphosphate is synthesized by microwave radiation catalysis, so that the synthesis efficiency is improved, and the product quality is greatly improved. However, in the microwave catalysis of certain chemical reactions, the build-up of solid products interferes with the continuation of the chemical reaction due to the formation of these solid products during the reaction. Currently, no effective method for solving the problems exists in the market, and the problems restrict the application of microwave energy in the chemical field.
Microwave refers to electromagnetic waves having a frequency of 300 mhz to 300 ghz. Polar molecules in the heated media mass. Under the action of fast changing high frequency electromagnetic field, the polarity orientation will change with the change of the outer electric field, resulting in molecular motion and mutual friction effect. At this point the microwave energy is converted to heat energy in the medium, raising the temperature of the material.
The prior art has the following defects: 1. the existing microwave oven has single function, only has heating function, is not suitable for the reaction that high-viscosity and elastoplastic materials are generated in the reaction process and needs to be kneaded and stirred, and cannot meet the requirement of real-time stirring and kneading in certain chemical applications. 2. The temperature of reactants cannot be controlled according to the requirement of reaction conditions in the existing microwave oven, so that solid polymerization reaction is mostly generated, the advantage of microwave is sacrificed, heating is carried out by using a heat transfer mode, and the heating efficiency is not high and the heating is not uniform.
Disclosure of Invention
The invention aims to solve the technical problem of providing a microwave reaction device with a built-in kneader aiming at the condition that high-viscosity elastoplastic substances are generated in the heating process, which can knead and stir reaction materials in real time in the reaction process and ensure the full and uniform reaction.
The technical scheme of the invention is as follows: a microwave reaction kettle with a kneader consists of two parts, wherein one part is a material kneading device, and the other part is a microwave radiation device;
the material kneading device is also used as a microwave reaction cavity, a plurality of kneading cutter discs are arranged in the material kneading device, the kneading cutter discs are positioned at the bottom of the cavity, the bottom of the whole reaction cavity is in a W double-arc structure, the radian is attached to the motion trail of the kneading cutter discs, so that sufficient kneading of materials can be ensured, the kneading cutter discs are connected through a cutter disc transmission shaft, and transmission power is provided by a motor;
the microwave radiation device is positioned on a top cover of the reaction cavity, a microwave radiator is arranged at the center of the top cover, and microwave energy is radiated outwards in a monopole antenna mode; the top cover is provided with an infrared temperature measuring device which can measure the reaction temperature in real time.
The infrared temperature measuring device is connected with the microwave radiator through the controller, the controller collects the reaction temperature in the reaction cavity through the thermometer, and the microwave power of the microwave radiator is controlled to control the temperature of the reactant.
The alternating current motor is provided with a frequency converter, and the rotating speed of the kneading machine can be adjusted by adjusting the frequency converter of the motor according to the use requirement.
The controller, the microwave source and the motor are powered by 220V.
The controller is connected with the thermometer and the microwave source and realizes the constant temperature heating of the microwave by controlling the microwave power.
Wherein: the controller is in the prior art, receives a temperature signal fed back by a temperature sensor, and establishes a function relation of temperature, microwave power and time through a PID algorithm. And the microwave output power is changed in real time according to a judgment result given by the function, so that smooth temperature control is realized.
The kneading cutter head can be used for kneading materials and stirring the electromagnetic field mode in the reaction cavity (the kneading cutter head is made of metal materials, and a metal stirring structure arranged in the microwave reaction cavity can be used for stirring in the microwave electromagnetic field mode).
Compared with the prior art that microwave heating and material kneading are separately carried out or other heat sources are used for replacing the microwave heat sources, the microwave reaction kettle with the kneader has the following advantages:
(1) solves the problem that the reaction can not be continued because solid polymer is generated in the microwave heating chemical polymerization reaction.
(2) The problem that the materials cannot be kneaded in real time in the microwave heating process is solved.
(3) The method has the advantages of good temperature control function, simple operation and capability of controlling the reaction temperature according to the reaction temperature requirement.
(4) The kneading structure is added in the microwave cavity, so that the traditional heating can be replaced by microwave heating, the heating efficiency is improved, and the reaction rate and the quality of a product are improved.
Drawings
FIG. 1 is a schematic structural view of a microwave kneading integrated machine according to the present invention;
in the figure: 1. an infrared temperature measuring device; 2. a microwave radiator; 3. a top cover; 4. a choke groove; 5. a kneading cutter head; 6. the blade disc transmission shaft.
FIG. 2 is a schematic view of microwave kneading integrated electrical connection of the present invention.
Detailed Description
A microwave reaction kettle with a kneader consists of two parts, wherein one part is a material kneading device, and the other part is a microwave radiation device;
the material kneading device is also used as a microwave reaction cavity, a plurality of kneading cutter discs 5 are arranged in the material kneading device, the kneading cutter discs 5 are positioned at the bottom of the cavity, the bottom of the whole reaction cavity is in a W double-arc structure, the radian is attached to the motion track of the kneading cutter discs, so that sufficient kneading of materials can be ensured, the kneading cutter discs are connected through a cutter disc transmission shaft 6, and transmission power is provided by a motor;
the microwave radiation device is positioned on a top cover 3 of the reaction cavity, a microwave radiator 2 is arranged at the center of the top cover 3, and microwave energy is radiated outwards in a monopole antenna mode; the top cover 3 is provided with an infrared temperature measuring device 1 which can measure the reaction temperature in real time.
The infrared temperature measuring device 1 is connected with the microwave radiator 2 through a controller, the controller collects the reaction temperature in the reaction cavity through a thermometer, and the microwave power of the microwave radiator 2 is controlled to control the temperature of the reactant.
The alternating current motor is provided with a frequency converter, and the rotating speed of the kneading machine can be adjusted by adjusting the frequency converter of the motor according to the use requirement.
The controller, the microwave source and the motor are powered by 220V.
Example 1
The equipment is used for synthesizing the agricultural ammonium polyphosphate water-soluble fertilizer, urea and phosphoric acid are used as raw materials to synthesize ammonium polyphosphate, the microwave power is set to be 500w, the reaction temperature is set to be 170 ℃, and the agricultural ammonium polyphosphate water-soluble fertilizer product can be synthesized only in 8min under the microwave radiation heating; the microwave power is 1000W, the reaction temperature is set to be 160 ℃, and the agricultural ammonium polyphosphate water-soluble fertilizer product can be synthesized within 6 min. The conventional heating method for synthesizing the agricultural ammonium polyphosphate product generally needs to be used for heating reaction for about 3 hours.
Example 2
The equipment is used for synthesizing the ammonium polyphosphate flame retardant, phosphoric acid and melamine are used as raw materials to synthesize low-water-solubility ammonium polyphosphate, the microwave power is 600W, phosphoric acid is added firstly, the set temperature is 300 ℃, the melamine is added after the microwave radiation heating temperature of 30-sensitive temperature is reduced to 180 ℃, the reaction temperature is 260 ℃, dry ammonia is introduced in the reaction process, the heating is stopped after the heating, stirring and kneading reaction is carried out for 20min under the microwave radiation, and the low-water-solubility ammonium polyphosphate flame retardant product can be obtained after cooling. And the conventional heating synthesis of low water-solubility ammonium polyphosphate requires about 4 hours.
Example 3
The equipment is used for synthesizing the ammonium polyphosphate flame retardant, ammonium dihydrogen phosphate and melamine are used as raw materials to synthesize the ammonium polyphosphate flame retardant, the microwave power is 500W, the reaction temperature is set to be 250 ℃, the ammonium polyphosphate flame retardant is heated, stirred, kneaded and reacted for 30min under the condition of no ammonia gas introduction, then the heating and cooling are stopped, and the low-water-solubility ammonium polyphosphate flame retardant product with balanced quality can be obtained after cooling. The low-water-solubility ammonium polyphosphate can be synthesized without introducing ammonia gas in the reaction process, and is difficult to cure under the condition of no introduction of ammonia by conventional heating, and the synthesized product has different quality due to the temperature gradient and the bottle wall effect in the reaction process.
Example 4
Table 1 compares the condensation reaction of alpha-naphthaldehyde with diethyl malonate using the above-described apparatus using microwave radiation and conventional heating. The microwave is used to shorten the traditional heating time to 3 per mill originally, and the energy consumption is reduced by 95 percent. The microwave has the advantages of high efficiency, energy conservation, environmental protection and the like.
TABLE 1 comparison of the condensation reaction of alpha-naphthaldehyde and diethyl malonate between conventional heating and microwave heating
| Time of heating | Consuming time (min) | Yield (%) | Energy consumption (KJ/mol) |
| Conventional heating | 1440 | 44.7 | 4.9 |
| |
5 | 78 | 0.24 |
Claims (4)
1. A microwave reaction kettle with a kneader is characterized in that: the device consists of two parts, wherein one part is a material kneading device, and the other part is a microwave radiation device;
the material kneading device is also used as a microwave reaction cavity, a plurality of kneading cutter discs (5) are arranged in the material kneading device, the kneading cutter discs (5) are positioned at the bottom of the cavity, the bottom of the whole reaction cavity is of a W double-arc structure, the radian is attached to the motion trail of the kneading cutter discs, sufficient kneading of materials can be ensured, the kneading cutter discs (5) are connected through a cutter disc transmission shaft (6), and transmission power is provided by a motor;
the microwave radiation device is positioned on a top cover (3) of the reaction cavity, a microwave radiator (2) is arranged at the center of the top cover (3), and microwave energy is radiated outwards in a monopole antenna mode; the top cover (3) is provided with an infrared temperature measuring device (1) which can measure the reaction temperature in real time.
2. The microwave reactor with a kneader as set forth in claim 1, characterized in that: the alternating current motor is provided with a frequency converter, and the rotating speed of the kneading cutter head (5) can be adjusted by adjusting the frequency converter of the motor according to the use requirement.
3. The microwave reactor with a kneader as set forth in claim 1, characterized in that: the infrared temperature measuring device (1) is connected with the microwave radiator (2) through a controller, the controller collects the reaction temperature in the reaction cavity through a thermometer, and the microwave power of the microwave radiator (2) is controlled to control the temperature of the reactant.
4. The microwave reactor with a kneader as set forth in claim 3, characterized in that: the controller, the microwave radiator and the motor are powered by 220V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010269945.9A CN111359565A (en) | 2020-04-08 | 2020-04-08 | Microwave reaction kettle with kneader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010269945.9A CN111359565A (en) | 2020-04-08 | 2020-04-08 | Microwave reaction kettle with kneader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111359565A true CN111359565A (en) | 2020-07-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010269945.9A Pending CN111359565A (en) | 2020-04-08 | 2020-04-08 | Microwave reaction kettle with kneader |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111359565A (en) |
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2020
- 2020-04-08 CN CN202010269945.9A patent/CN111359565A/en active Pending
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