阅读说明：本技术 微波化学反应频率调配控制方法、中央处理装置及系统 (Microwave chemical reaction frequency allocation control method, central processing unit and system ) 是由 唐正明 洪涛 张桃 朱铧丞 黄卡玛 于 2020-03-31 设计创作，主要内容包括：本申请公开了一种微波化学反应频率调配控制方法、中央处理装置及微波化学反应系统,方法包括：根据化学反应方程式、介电函数和反应参数得到计算模型；在微波频率范围内以预设频率步长进行多物理场计算,根据计算结果得到各反应时间段的优选频率集合；从第一个反应时间段的优选频率集合中选取出性能最优的目标频率并进行作用；对于其余反应时间段,获取上一反应时间段结束时的反射功率和温度,从与当前反应时间段的优选频率集合中获取与反射功率和温度匹配的匹配频率并作用于当前反应时间段。本申请公开的上述技术方案,通过从各优选频率集合中选取出对应频率进行作用来提高微波的促进作用,以提高化学反应的效率,并降低热点和热失控出现的几率。(The application discloses a microwave chemical reaction frequency allocation control method, a central processing unit and a microwave chemical reaction system, wherein the method comprises the following steps: obtaining a calculation model according to a chemical reaction equation, a dielectric function and reaction parameters; performing multi-physical field calculation within a microwave frequency range by using a preset frequency step length, and obtaining an optimal frequency set of each reaction time period according to a calculation result; selecting a target frequency with optimal performance from the optimal frequency set of the first reaction time period and acting; and for the rest of the reaction time periods, acquiring the reflected power and the temperature at the end of the last reaction time period, and acquiring a matching frequency matched with the reflected power and the temperature from the preferred frequency set of the current reaction time period and acting on the current reaction time period. According to the technical scheme disclosed by the application, the corresponding frequency is selected from each optimal frequency set to act so as to improve the promotion effect of the microwave, improve the efficiency of the chemical reaction and reduce the probability of hot spots and thermal runaway.)

1. A microwave chemical reaction frequency allocation control method is characterized by comprising the following steps:

modeling according to a chemical reaction equation, a dielectric function and reaction parameters of a chemical reaction system to obtain a multi-physical-field calculation model for promoting the chemical reaction system by microwaves;

according to the multi-physical-field calculation model, performing multi-physical-field calculation within a microwave frequency range by using a preset frequency step length, and obtaining a preferred frequency set corresponding to each reaction time period according to a calculation result of each microwave frequency acting on the chemical reaction system;

selecting a target frequency promoting optimal performance from a preferred frequency set corresponding to the first reaction time period, and applying the target frequency to the first reaction time period;

and for the rest reaction time periods, acquiring the actually-measured reflected power and the actually-measured temperature of the chemical reaction system at the end of the last reaction time period of the current reaction time period, acquiring the matching frequency matched with the actually-measured reflected power and the actually-measured temperature from the preferred frequency set corresponding to the current reaction time period, and applying the matching frequency to the current reaction time period.

2. The method of claim 1, wherein when the target frequency for optimizing the performance is selected from the preferred frequency set corresponding to the first reaction time period, the method further comprises:

excluding the microwave frequency with the maximum energy absorbed by the current product from the preferred frequency set corresponding to the first reaction time period;

when a matching frequency matching the reflected power and the temperature is obtained from a preferred frequency set corresponding to a current reaction time period, further comprising:

excluding the microwave frequency with the largest energy absorbed by the current product from the set of preferred frequencies corresponding to the current reaction time period.

3. The microwave chemical reaction frequency allocation control method according to claim 1, wherein obtaining a matching frequency matching the measured reflected power and the measured temperature from a preferred frequency set corresponding to the current reaction time period comprises:

and acquiring matching frequency matched with the actually measured reflected power and the actually measured temperature from a pre-established relation table between each microwave frequency and the reflected power and the temperature in the preferred frequency set corresponding to the current reaction time period.

4. The method of claim 1, wherein the dielectric function is a multi-parameter function with respect to time, temperature, concentration and microwave frequency.

5. The method of claim 1, wherein after obtaining the preferred frequency set corresponding to each reaction time period according to the calculation result of each microwave frequency acting on the chemical reaction system, the method further comprises:

and displaying a prompt of the calculation end on the liquid crystal display screen.

6. The method of claim 5, wherein after obtaining the preferred frequency set corresponding to each reaction time period according to the calculation result of each microwave frequency acting on each reaction time period of the chemical reaction system, the method further comprises:

the resulting set of preferred frequencies is stored.

7. A central processing apparatus, comprising:

a memory for storing a computer program, chemical reaction equations, dielectric functions and reaction parameters of the chemical reaction system;

a processor for implementing the steps of the microwave chemical reaction frequency adjustment control method according to any one of claims 1 to 6 when executing the computer program.

8. The central processing apparatus according to claim 7, further comprising:

an input component for inputting a chemical reaction equation of the chemical reaction system, the dielectric function, and the reaction parameter through the input component.

9. A microwave chemical reaction system, comprising the central processing unit, the frequency regulating and controlling unit, the measurement feedback unit, the microwave feeding unit, and the reaction unit chamber provided with the microwave feeding unit according to claim 7 or 8, wherein:

the frequency regulating and controlling device is used for driving the microwave feed-in device to feed in microwave frequency matched with each reaction time period to each reaction time period under the control of the central processing device;

the measurement feedback device is used for measuring the reflection power and the temperature of the chemical reaction system in real time and sending the reflection power and the temperature to the central processing device, and the central processing device acquires the actually measured reflection power and the actually measured temperature of the chemical reaction system when the last reaction time period of the current reaction time period is finished.

Technical Field

The present disclosure relates to the field of microwave chemistry technologies, and more particularly, to a microwave chemical reaction frequency allocation control method, a central processing unit, and a microwave chemical reaction system.

Background

With the rapid development of science and technology, microwaves are widely applied to the fields of catalysis, synthesis, extraction, digestion and the like of chemistry, and microwave chemistry is formed.

At present, most of existing microwave chemical reaction devices adopt microwaves with fixed frequency to act on chemical reactions, and the standing wave distribution formed by the microwave chemical reaction devices is relatively fixed, but because the chemical reactions dynamically change along with time, the components of reactants and products dynamically change, and the absorption and reflection effects of the microwave chemical reaction devices on microwaves also have time-varying characteristics, so the microwaves with fixed frequency may have better promoting effects at the beginning, but the promoting effects of the microwaves are reduced along with the reaction, and even the promoting effects are lost, which can cause the efficiency of the chemical reactions to be reduced, in addition, the action of the microwaves with fixed frequency is easy to have the problems of overhigh local area temperature and thermal runaway, which can not only influence the quality of the products, but also can cause potential safety hazards such as combustion or explosion.

In summary, how to improve the efficiency of chemical reaction and reduce the occurrence probability of hot spots and thermal runaway is a technical problem to be solved by those skilled in the art.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a microwave chemical reaction frequency allocation control method, a central processing unit and a microwave chemical reaction system, which are used to improve the efficiency of chemical reaction and reduce the occurrence probability of hot spots and thermal runaway.

In order to achieve the above purpose, the present application provides the following technical solutions:

a microwave chemical reaction frequency allocation control method comprises the following steps:

modeling according to a chemical reaction equation, a dielectric function and reaction parameters of a chemical reaction system to obtain a multi-physical-field calculation model for promoting the chemical reaction system by microwaves;

according to the multi-physical-field calculation model, performing multi-physical-field calculation within a microwave frequency range by using a preset frequency step length, and obtaining a preferred frequency set corresponding to each reaction time period according to a calculation result of each microwave frequency acting on the chemical reaction system;

selecting a target frequency promoting optimal performance from a preferred frequency set corresponding to the first reaction time period, and applying the target frequency to the first reaction time period;

and for the rest reaction time periods, acquiring the actually-measured reflected power and the actually-measured temperature of the chemical reaction system at the end of the last reaction time period of the current reaction time period, acquiring the matching frequency matched with the actually-measured reflected power and the actually-measured temperature from the preferred frequency set corresponding to the current reaction time period, and applying the matching frequency to the current reaction time period.

Preferably, when the target frequency promoting the optimal performance is selected from the preferred frequency set corresponding to the first reaction time period, the method further includes:

excluding the microwave frequency with the maximum energy absorbed by the current product from the preferred frequency set corresponding to the first reaction time period;

when a matching frequency matching the reflected power and the temperature is obtained from a preferred frequency set corresponding to a current reaction time period, further comprising:

excluding the microwave frequency with the largest energy absorbed by the current product from the set of preferred frequencies corresponding to the current reaction time period.

Preferably, obtaining a matching frequency matched with the measured reflected power and the measured temperature from a preferred frequency set corresponding to the current reaction time period includes:

and acquiring matching frequency matched with the actually measured reflected power and the actually measured temperature from a pre-established relation table between each microwave frequency and the reflected power and the temperature in the preferred frequency set corresponding to the current reaction time period.

Preferably, the dielectric function is a multi-parameter function with respect to time, temperature, concentration and microwave frequency.

Preferably, after obtaining a preferred frequency set corresponding to each reaction time period according to a calculation result of each microwave frequency acting on the chemical reaction system, the method further includes:

and displaying a prompt of the calculation end on the liquid crystal display screen.

Preferably, after obtaining a preferred frequency set corresponding to each reaction time period according to a calculation result of each microwave frequency acting on each reaction time period of the chemical reaction system, the method further includes:

the resulting set of preferred frequencies is stored.

A central processing apparatus, comprising:

a memory for storing a computer program, chemical reaction equations, dielectric functions and reaction parameters of the chemical reaction system;

a processor for implementing the steps of the microwave chemical reaction frequency adjustment control method according to any one of the above mentioned items when the computer program is executed.

Preferably, the method further comprises the following steps:

an input component for inputting a chemical reaction equation of the chemical reaction system, the dielectric function, and the reaction parameter through the input component.

A microwave chemical reaction system comprises the central processing unit, a frequency regulation and control device, a measurement feedback device, a microwave feed-in device and a reaction device cavity provided with the microwave feed-in device, wherein:

the frequency regulating and controlling device is used for driving the microwave feed-in device to feed in microwave frequency matched with each reaction time period to each reaction time period under the control of the central processing device;

the measurement feedback device is used for measuring the reflection power and the temperature of the chemical reaction system in real time and sending the reflection power and the temperature to the central processing device, and the central processing device acquires the actually measured reflection power and the actually measured temperature of the chemical reaction system when the last reaction time period of the current reaction time period is finished.

The application provides a microwave chemical reaction frequency allocation control method, a central processing unit and a microwave chemical reaction system, wherein the method comprises the following steps: obtaining a multi-physical-field calculation model of the microwave-promoted chemical reaction system according to a chemical reaction equation, a dielectric function and reaction parameters of the chemical reaction system; according to the multi-physical-field calculation model, performing multi-physical-field calculation within a microwave frequency range by using a preset frequency step length, and obtaining an optimal frequency set corresponding to each reaction time period according to a calculation result of each microwave frequency acting on the chemical reaction system; selecting a target frequency promoting optimal performance from a preferred frequency set corresponding to the first reaction time period, and applying the target frequency to the first reaction time period; and for the rest reaction time periods, acquiring the actually-measured reflected power and the actually-measured temperature of the chemical reaction system at the end of the last reaction time period of the current reaction time period, acquiring the matching frequency matched with the actually-measured reflected power and the actually-measured temperature from the preferred frequency set corresponding to the current reaction time period, and applying the matching frequency to the current reaction time period.

According to the technical scheme disclosed by the application, the calculation result of each microwave frequency selected in the microwave frequency range acting on the chemical reaction system is obtained according to the multi-physical-field calculation model, and the optimal frequency set corresponding to each reaction time period is obtained through analysis according to the calculation result. Then, selecting a target frequency promoting optimal performance from a preferred frequency set corresponding to the first reaction time period, and applying the frequency to the first reaction time period; and for the rest reaction time periods, acquiring a matching frequency matched with the measured reflected power and the measured temperature of the last reaction time period ending of the current reaction time period from the corresponding preferred frequency set, and applying the frequency to the current reaction time period. According to the technical scheme, the stability and the high efficiency of each frequency on the promotion effect of the chemical reaction are improved by calculating the optimal frequency set and selecting the frequency matched with the reaction time period from each optimal frequency set to act, so that the chemical reaction efficiency is improved, and the changed frequency can avoid the problems of overhigh temperature and thermal runaway of a local area as much as possible, so that the safety of the chemical reaction is improved, and the quality of a product is improved.

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 flowchart of a microwave chemical reaction frequency allocation control method according to an embodiment of the present disclosure;

FIG. 2 is a nuclear magnetic resonance hydrogen spectrum of the reaction solution after the reaction at a fixed frequency;

FIG. 3 is a NMR spectrum of a reaction solution after reaction by the method provided herein;

fig. 4 is a schematic structural diagram of a central processing unit according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a microwave chemical reaction frequency control system according to an embodiment of the present disclosure.

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.

Referring to fig. 1, which shows a flowchart of a microwave chemical reaction frequency allocation control method provided in an embodiment of the present application, a microwave chemical reaction frequency allocation control method provided in an embodiment of the present application may include:

s11: and modeling according to a chemical reaction equation, a dielectric function and reaction parameters of the chemical reaction system to obtain a multi-physical-field calculation model of the microwave-promoted chemical reaction system.

When the microwave chemical reaction frequency is controlled, the chemical reaction equation, the dielectric function and the reaction parameters of the chemical reaction system may be input through the input module (specifically, a keyboard, etc.), and the multi-physical field calculation model of the microwave-promoted chemical reaction system may be obtained by performing modeling according to the output chemical reaction equation, the dielectric function and the reaction parameters of the chemical reaction system, or the chemical reaction equation, the dielectric function and the reaction parameters of the chemical reaction system may be input through the input module in advance and stored, and then the multi-physical field calculation model of the microwave-promoted chemical reaction system may be obtained by performing modeling according to the pre-stored chemical reaction equation, the dielectric function and the reaction parameters of the chemical reaction system.

S12: and according to the multi-physical-field calculation model, performing multi-physical-field calculation within a microwave frequency range by using a preset frequency step length, and obtaining a preferred frequency set corresponding to each reaction time period according to a calculation result of each microwave frequency acting on the chemical reaction system.

After the multi-physical-field calculation model is obtained, the corresponding microwave frequencies can be brought into the multi-physical-field calculation model one by one within the microwave frequency range according to the preset frequency step length to perform multi-physical-field calculation (specifically, calculation such as electric field, magnetic field, dissipation power, temperature and chemical reaction kinetic equation) so as to respectively obtain the calculation result of each microwave frequency acting on the chemical reaction system, wherein the calculation result includes multiple information such as the change of physical quantities such as product concentration, temperature of the chemical reaction system, reflected power of the chemical reaction system and the like along with time. After the calculation is completed, the entire chemical reaction time (i.e., the chemical reaction time set in the multi-physics calculation model) may be divided into a plurality of reaction time periods for analysis.

After obtaining the calculation result of each microwave frequency acting on the chemical reaction system, comparing the calculation results of the first reaction time period of each microwave frequency acting on the chemical reaction system, and selecting the microwave frequency with the better calculation result to form an optimal frequency set so as to improve the promotion effect of the microwave frequency on the chemical reaction system, specifically, taking the calculation result including the product concentration, the temperature of the chemical reaction system, and the reflected power of the chemical reaction system as an example, at this time, the microwave frequencies may be sorted in the order of the product concentration from high to low, the microwave frequency with the product concentration higher than a first preset value may be selected, then the selected microwave frequencies may be sorted in the order of the temperature from low to high, the microwave frequency with the temperature lower than a second preset value may be selected, and the selected microwave frequency may be sorted in the order of the reflected power of the reactants from high to low on the basis And then selecting the microwave frequency with the reflection power of the reactant higher than a third preset value, then sequencing the selected microwave frequency according to the sequence of the reflection power of the product from low to high, and selecting the microwave frequency with the reflection power of the product lower than a fourth preset value, so as to form an optimal frequency set by using the selected microwave frequency. The preferred frequency sets for the remaining reaction time periods are determined in a similar manner and will not be described further herein.

S13: and selecting a target frequency which promotes the optimal performance from the preferred frequency set corresponding to the first reaction time period, and applying the target frequency to the first reaction time period.

After the preferred frequency set corresponding to each reaction time period is selected, for the first reaction time period, the target frequency with the best promotion performance can be selected from the preferred frequency set corresponding to the first reaction time period, that is, the microwave frequency arranged at the first position is selected from the preferred frequency set as the target frequency, and the selected target frequency is acted on the first reaction time period, so as to improve the promotion effect of the microwave frequency on the first reaction period of the chemical reaction system, thereby facilitating the improvement of the reaction efficiency of the chemical reaction.

S14: and for the rest reaction time periods, acquiring the actually-measured reflected power and the actually-measured temperature of the chemical reaction system at the end of the last reaction time period of the current reaction time period, acquiring the matching frequency matched with the actually-measured reflected power and the actually-measured temperature from the preferred frequency set corresponding to the current reaction time period, and applying the matching frequency to the current reaction time period.

After the first reaction time period is finished, acquiring the actually-measured reflected power and the actually-measured temperature of the chemical reaction system at the end of the first reaction time period, matching the acquired actually-measured reflected power and the acquired actually-measured temperature with the preferred frequency set corresponding to the second reaction time period to obtain a matching frequency, and applying the matching frequency to the second reaction time period; after the second reaction time period is finished, the measured reflected power and the measured temperature of the chemical reaction system at the end of the second reaction time period may be obtained, the obtained measured reflected power and the obtained measured temperature are matched with the preferred frequency corresponding to the third reaction time period, and the matching frequency at this time is applied to the third reaction time period … …, and the similar processes are performed for the remaining reaction time periods until all the reaction time periods are completed.

By acquiring the reflected power and temperature of the chemical reaction system in time, matching the reflected power and temperature with the optimal frequency set corresponding to the current reaction time period and then acting the chemical reaction system by the matching frequency, the selected microwave frequency can better promote the chemical reaction system, and the purpose of improving the chemical reaction efficiency is achieved. On the other hand, the frequency of the change can reduce the probability of the hot spot problem and the thermal runaway problem along with the change of the frequency in the working process, so that the chemical reaction efficiency can be improved, the problem of combustion or explosion is avoided, and the safety of the reaction of a chemical reaction system is ensured.

According to the technical scheme disclosed by the application, the calculation result of each microwave frequency selected in the microwave frequency range acting on the chemical reaction system is obtained according to the multi-physical-field calculation model, and the optimal frequency set corresponding to each reaction time period is obtained through analysis according to the calculation result. Then, selecting a target frequency promoting optimal performance from a preferred frequency set corresponding to the first reaction time period, and applying the frequency to the first reaction time period; and for the rest reaction time periods, acquiring a matching frequency matched with the measured reflected power and the measured temperature of the last reaction time period ending of the current reaction time period from the corresponding preferred frequency set, and applying the frequency to the current reaction time period. According to the technical scheme, the stability and the high efficiency of each frequency on the promotion effect of the chemical reaction are improved by calculating the optimal frequency set and selecting the frequency matched with the reaction time period from each optimal frequency set to act, so that the chemical reaction efficiency is improved, and the changed frequency can avoid the problems of overhigh temperature and thermal runaway of a local area as much as possible, so that the safety of the chemical reaction is improved, and the quality of a product is improved.

The microwave chemical reaction frequency allocation control method provided in the embodiment of the present application, when the target frequency that promotes the optimal performance is selected from the preferred frequency set corresponding to the first reaction time period, may further include:

excluding the microwave frequency with the maximum energy absorbed by the current product from the preferred frequency set corresponding to the first reaction time period;

when the matching frequency matched with the reflected power and the temperature is obtained from the preferred frequency set corresponding to the current reaction time period, the method may further include:

the microwave frequency at which the energy absorbed by the current product is maximal is excluded from the set of preferred frequencies corresponding to the current reaction time period.

When the target frequency promoting the optimal performance is selected from the preferred frequency set corresponding to the first reaction time period, the microwave frequency with the maximum energy absorbed by the current product can be excluded from the preferred frequency set corresponding to the first reaction time period, so as to avoid the temperature rise of the chemical reaction system caused by the fact that the microwave frequency is selected as the target frequency acting on the first reaction time period and the product absorbs a large amount of energy.

In addition, when the matching frequency matching the reflected power and the temperature is obtained from the preferred frequency set corresponding to the current reaction time period, the microwave frequency with the maximum energy absorbed by the current product can be excluded from the preferred frequency set corresponding to the current reaction time period, so as to avoid that the microwave frequencies are selected as the matching frequencies acting on the rest of the reaction time periods and the energy is greatly absorbed by the product, thereby avoiding the generation of a large amount of heat due to the excessively fast temperature rise of the chemical reaction system as much as possible.

The microwave chemical reaction frequency allocation control method provided in the embodiment of the present application obtains a matching frequency matched with an actually measured reflected power and an actually measured temperature from an optimal frequency set corresponding to a current reaction time period, and may include:

and acquiring matching frequency matched with the actually measured reflected power and the actually measured temperature from a pre-established relation table between each microwave frequency and the reflected power and the temperature in the optimal frequency set corresponding to the current reaction time period.

Before acquiring the matching frequency matched with the actually-measured reflected power and the actually-measured temperature from the optimal frequency set corresponding to the reaction time period, a relation table between the microwave frequency and the reflected power and the temperature can be established in advance for the optimal frequency set, and when acquiring the matching frequency, the closest microwave frequency can be matched from the pre-established relation table as the matching frequency according to the actually-measured reflected power and the actually-measured temperature at the end of the last reaction time period of the acquired current reaction time period, so that the acquired matching frequency can better act on a chemical reaction system, the stability of the promotion action of the microwave frequency is improved, and the problems of hot spots and thermal runaway of the microwave frequency in the action process are avoided as much as possible.

In the method for controlling frequency adjustment of microwave chemical reaction provided by the embodiment of the application, the dielectric function is a multi-parameter function related to time, temperature, concentration and microwave frequency.

In the application, the dielectric function participating in the modeling of the multi-physical-field calculation model is specifically a multi-parameter function related to time, temperature, concentration and microwave frequency, so as to consider the influence of different microwave frequencies on a chemical reaction system, thereby improving the accuracy of the multi-physical-field calculation, and selecting a more matched microwave frequency to act on the chemical reaction system, so as to improve the efficiency of the chemical reaction and the quality of a product.

The microwave chemical reaction frequency allocation control method provided in the embodiment of the present application, after obtaining the preferred frequency set corresponding to each reaction time period according to the calculation result of each microwave frequency acting on the chemical reaction system, may further include:

and displaying a prompt of the calculation end on the liquid crystal display screen.

After the optimal frequency set corresponding to each reaction time period is obtained according to the calculation result of each microwave frequency acting on the chemical reaction system, the prompt of calculation completion can be displayed on the liquid crystal display screen, so that the worker can know the prompt in time, and the worker can start the reaction of the chemical reaction system through the start key in time according to the prompt.

The microwave chemical reaction frequency allocation control method provided in the embodiment of the present application, after obtaining the preferred frequency set corresponding to each reaction time period according to the calculation result of each reaction time period in which each microwave frequency acts on the chemical reaction system, may further include:

the resulting set of preferred frequencies is stored.

After the preferred frequency set corresponding to each reaction time period is obtained according to the calculation result of each microwave frequency acting on each reaction time period of the chemical reaction system, the preferred frequency set can be stored, so that the staff can check the preferred frequency set subsequently, and reflected power and temperature obtained subsequently are compared and matched with the preferred frequency, so that the matching frequency is obtained.

The reaction of methanol and oleic acid under the catalytic action of concentrated sulfuric acid is taken as a research object to compare the prior art with the scheme provided by the application: methanol and oleic acid react under the catalytic action of concentrated sulfuric acid to generate oleic acid grease and water, the methanol, the oleic acid and the concentrated sulfuric acid with the same amount are used for reaction in a microwave heating environment in an experiment, and the microwave power of 28W is used for heating under two different conditions of fixed frequency and the proposed scheme. After 30 minutes, the reaction reagents were removed. The sample 1 is a reaction reagent under the fixed frequency, and the sample 2 is a reaction reagent under the action of the method;

the contents of sample 1 and sample 2 were compared using a nuclear magnetic resonance spectrometer.

Sample treatment: taking one milliliter of the crude product which is mixed uniformly, adding saturated sodium bicarbonate solution for quenching, extracting by using ethyl acetate, drying an organic phase by using anhydrous sodium sulfate, filtering, and spin-drying a solvent;

nuclear magnetic sample preparation: taking five drops of samples in a pv tube, adding two drops of dibromomethane as an internal standard, adding 0.5ml of deuterated chloroform, mixing uniformly, and then loading into a nuclear magnetic tube to obtain a nuclear magnetic resonance hydrogen spectrum, as shown in fig. 2 and 3, wherein fig. 2 is the nuclear magnetic resonance hydrogen spectrum of a reaction solution after reaction at a fixed frequency, and fig. 3 is the nuclear magnetic resonance hydrogen spectrum of the reaction solution after reaction under the action of the method provided by the application;

and (3) analysis: the position of a marked peak in dibromomethane is about 4.9, the peak area is determined to be 1, the position of a characteristic peak (methyl) of a product is 3.7, the integrated area represents the relative content (relative to an internal standard), and because the added internal standards are the same and the amount of a crude product is the same, the relative content of the products can be compared by using the relative content of the characteristic peak of the products, and the larger the relative content is, the larger the product content in the crude product is; wherein, table 1 is a table of the characteristic peak integral areas of sample 1 and sample 2;

TABLE 1 characteristic Peak integral area tables for sample 1 and sample 2

As a result: in parallel, the yield of methyl oleate in sample 2 (variable frequency condition) is higher, and the yield increase rate is 9.7% compared with the traditional fixed microwave frequency effect.

An embodiment of the present application further provides a central processing apparatus, and referring to fig. 4, it shows a schematic structural diagram of a central processing apparatus provided in an embodiment of the present application, and the central processing apparatus may include:

a memory 21 for storing a computer program, a chemical reaction equation of the chemical reaction system, a dielectric function, and a reaction parameter;

the processor 22, when executing the computer program stored in the memory 21, may implement the following steps:

modeling according to a chemical reaction equation, a dielectric function and reaction parameters of a chemical reaction system to obtain a multi-physical-field calculation model of the microwave-promoted chemical reaction system; according to the multi-physical-field calculation model, performing multi-physical-field calculation within a microwave frequency range by using a preset frequency step length, and obtaining an optimal frequency set corresponding to each reaction time period according to a calculation result of each microwave frequency acting on the chemical reaction system; selecting a target frequency promoting optimal performance from a preferred frequency set corresponding to the first reaction time period, and applying the target frequency to the first reaction time period; and for the rest reaction time periods, acquiring the reflected power and the temperature of the chemical reaction system at the end of the last reaction time period of the current reaction time period, acquiring a matching frequency matched with the reflected power and the temperature from a preferred frequency set corresponding to the current reaction time period, and applying the matching frequency to the current reaction time period.

In the central processing unit, the memory can store not only the computer program, but also the chemical reaction equation, the dielectric function and the reaction parameter of the chemical reaction system, so that the multi-physical field calculation model of the microwave-assisted chemical reaction system can be obtained by modeling according to the data.

The central processing apparatus provided in the embodiment of the present application may further include:

and the input component is used for inputting the chemical reaction equation, the dielectric function and the reaction parameters of the chemical reaction system through the input component. The central processing unit provided by the present application may further include an input component (specifically, a keyboard, etc.), through which a chemical reaction equation, a dielectric function, a reaction parameter, etc. of the chemical reaction system may be input, so as to store the data or obtain a multi-physical-field calculation model of the microwave-assisted chemical reaction system by directly modeling the data.

The embodiment of the present application further provides a microwave chemical reaction system, referring to fig. 5, which shows a schematic structural diagram of a microwave chemical reaction provided in the embodiment of the present application, and the system may include the aforementioned central processing device 31, a frequency regulating device 32, a measurement feedback device 33, a microwave feed-in device 34, and a reaction device cavity 35 provided with the microwave feed-in device 34, wherein:

a frequency control device 32, for driving the microwave feed-in device 34 to feed in microwave frequency matched with each reaction time period to each reaction time period under the control of the central processing device 31;

and the measurement feedback device 33 is configured to measure the reflection power and the temperature of the chemical reaction system in real time, and send the reflection power and the temperature to the central processing device 31, where the central processing device 31 obtains the actually measured reflection power and the actually measured temperature of the chemical reaction system at the end of the last reaction time period of the current reaction time period.

In the microwave chemical reaction frequency control system provided by the present application, the central processing unit 31 is configured to execute any one of the above-mentioned microwave chemical reaction frequency allocation control methods; the frequency regulation and control device 32 is connected with the central processing device 31 and the microwave feed-in device 34, and is used for driving the microwave feed-in device 34 to feed in microwave frequency matched with each reaction time period to each reaction time period under the control of the central processing device 31, so that the purpose of avoiding hot spots and thermal runaway problems as much as possible while greatly improving the efficiency of promoting chemical reaction by microwave frequency compared with the traditional fixing method is achieved; the measurement feedback device 33 is connected to the central processing device 31 and the reaction device cavity 35, and is configured to measure the reflected power and the temperature of the chemical reaction system in real time, and send the measured reflected power and the temperature to the central processing device 31, where the central processing device 31 obtains the reflected power and the temperature of the chemical reaction system at the end of the previous reaction time period of the current reaction time period, and is convenient to obtain a matching frequency matching the obtained measured reflected power and the measured temperature from a preferred frequency set corresponding to the current reaction time period. The reaction device cavity 35 is configured to receive a microwave frequency feed and provide a reaction site for the chemical reaction system.

For a description of a relevant part in the central processing unit and the microwave chemical reaction system provided in the embodiments of the present application, reference may be made to detailed descriptions of a corresponding part in a microwave chemical reaction frequency allocation control method provided in the embodiments of the present application, and details are not described herein again.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include elements inherent in the list. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. In addition, parts of the above technical solutions provided in the embodiments of the present application, which are consistent with the implementation principles of corresponding technical solutions in the prior art, are not described in detail so as to avoid redundant description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.