Microchannel reactor for synthesizing monomethyl fumarate

Abstract

The utility model relates to the technical field of micro-channel reactors, in particular to a micro-channel reactor for synthesizing monomethyl fumarate, which is capable of automatically monitoring, regulating and controlling and effectively improving the synthesis efficiency and quality. Comprising a reactor body, a reaction micro-channel is arranged in the reactor body, and the reaction micro-channel is composed of a feeding section, a reaction section and a discharging section which are communicated in sequence; the microwave heating device is mounted outside the reactor body, corresponds to the reaction section and is used for performing microwave heating on materials in the reaction section, the microwave heating device comprises a microwave generator and a waveguide, and microwaves generated by the microwave generator are transmitted to the reaction section through the waveguide.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of micro -channel reactor, in particular to a kind of micro -channel reactor of synthetic fumaric acid monomethyl ester. BACKGROUND

[0002] Fumaric acid monomethyl ester is an organic compound, chemical formula is C5H6O4. It is mainly used as food additive and preservative, also used in pharmaceutical industry as intermediate. Fumaric acid monomethyl ester can be synthesized by various methods, one of which is to carry out esterification reaction by fumaric acid and methanol under the action of catalyst. Micro -channel reactor is a kind of efficient chemical production equipment, its characteristics are very small flow channel size (usually in micrometer level), can greatly improve heat transfer and mass transfer efficiency. Due to its high efficiency, low energy consumption, safety and other characteristics, it is widely used in fine chemical industry, pharmaceutical and other fields. Using micro -channel reactor to synthesize fumaric acid monomethyl ester can significantly improve the selectivity and yield of reaction, and reduce the generation of by-products.

[0003] In micro -channel reactor, the selection of heating mode determines the chemical reaction efficiency and conversion efficiency, and the traditional heating mode, such as high-voltage electric heating or catalyst self-heat reforming, has the defects of uneven heat transfer and low energy utilization rate, which leads to poor reaction temperature control precision, and affects the synthesis efficiency and quality of fumaric acid monomethyl ester. UTILITY MODEL CONTENT

[0004] To solve the above technical problems, the utility model provides a kind of micro -channel reactor of synthetic fumaric acid monomethyl ester for automatic monitoring and regulation, effectively improve synthesis efficiency and quality.

[0005] The utility model relates to a kind of micro -channel reactor of synthetic fumaric acid monomethyl ester, comprising:

[0006] Reactor body, reactor body inside is equipped with reaction micro -channel, and reaction micro -channel is composed of feeding section, reaction section and discharge section in turn communication;

[0007] Microwave heating device, installation is in the outside of reactor body, and microwave heating device is correspondingly arranged with reaction section, for carrying out microwave heating to the material in reaction section, and microwave heating device includes microwave generator and waveguide, and the microwave generated by microwave generator is transmitted to reaction section by waveguide.

[0008] Further, temperature sensor and pressure sensor are equipped on reactor body, respectively for monitoring the temperature and pressure in reaction micro -channel, temperature sensor and pressure sensor are connected with controller, and controller is electrically connected with microwave heating device.

[0009] Further, flow control valve is equipped at the feeding port of feeding section, and flow control valve is connected with controller.

[0010] Further, the inner wall of the reaction micro-channel is provided with a protective coating.

[0011] Further, the reaction section is provided with a turbulence assembly, the turbulence assembly comprises a plurality of turbulence plates arranged at intervals, the turbulence plates are arranged obliquely in the reaction micro-channel, the oblique directions of adjacent turbulence plates are opposite, and a plurality of through holes are arranged on the turbulence plates.

[0012] Further, the reactor body is internally provided with a cooling channel, the cooling channel is arranged correspondingly to the reaction section, and the inlet and outlet of the cooling channel are connected with a cooling medium source and a cooling medium recovery device respectively.

[0013] Further, the cooling medium in the cooling channel is water or heat-conducting oil.

[0014] Further, the discharge outlet of the discharge section is connected with a gas-liquid separation device, the gas-liquid separation device is provided with a gas outlet at the top and a liquid outlet at the bottom, and the liquid outlet is connected with a collection tank.

[0015] Compared with the prior art, the utility model has the beneficial effects that:

[0016] 1. The microwave heating device is used for heating the material in the reaction section, compared with the traditional high-voltage electric heating or catalyst autothermal reforming, the microwave heating can make the material in the reaction section be heated more uniformly, solve the problem of uneven heat transfer in the traditional heating mode, improve the reaction temperature control precision, and further improve the synthesis efficiency and quality of the monomethyl fumarate.

[0017] 2. The temperature sensor and the pressure sensor are arranged on the reactor body and connected with the controller, the controller is electrically connected with the microwave heating device, the temperature and the pressure in the reaction micro-channel can be monitored in real time, the microwave heating device can be automatically adjusted according to the monitoring data, the automation control of the reaction process is realized, and the stability of the reaction and the consistency of the product quality are improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model will be further described below in combination with the drawings.

[0019] Figure 1 It is the structure schematic diagram of the utility model;

[0020] Figure 2 It is the structure schematic diagram of the reactor body of the utility model;

[0021] Figure 3 It is Figure 2 the structure schematic diagram of A-A part in it;

[0022] Figure 4 It is Figure 2 the structure schematic diagram of B-B part in it;

[0023] Marked in the drawing: 1, reactor body; 2, reaction microchannel; 21, feed section; 211, feed port; 212, flow control valve; 22, reaction section; 221, turbulence assembly; 23, discharge section; 231, discharge port; 3, microwave heating device; 31, microwave generator; 32, waveguide; 4, temperature sensor; 5, pressure sensor; 7, cooling channel; 8, gas-liquid separation device; 81, gas outlet; 82, liquid outlet. DETAILED DESCRIPTION

[0024] The specific embodiments of the utility model are described in further detail below in combination with the drawings and examples. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

[0025] As shown in the utility model discloses a kind of microchannel reactors of synthesizing fumaric acid monomethyl ester, comprising: Figures 1 to 4

[0026] Reactor body 1, reactor body 1 inside is equipped with reaction microchannel 2, and reaction microchannel 2 is composed of feed section 21, reaction section 22 and discharge section 23 that are sequentially communicated;

[0027] Microwave heating device 3 is installed in the outside of reactor body 1, and microwave heating device 3 is correspondingly arranged with reaction section 22, for microwave heating to the material in reaction section 22, and microwave heating device 3 includes microwave generator 31 and waveguide 32, and the microwave generated by microwave generator 31 is transmitted to reaction section 22 by waveguide 32;

[0028] Reactants enter reaction microchannel from feed section, and in microchannel, reactants are divided into tiny fluid units, form highly dispersed flow state, greatly increase the contact area between reactants, so that reaction can be more uniform and efficient on microscale;When reactants enter reaction section, microwave generator generates microwave, and microwave is transmitted to reaction section by waveguide, and microwave is a high-frequency electromagnetic wave, when it acts on material containing polar molecules, polar molecules will quickly orient and rotate with the change of microwave electric field, and intense friction and collision between molecules will convert microwave energy into heat energy, under the action of energy provided by microwave heating, reactants generate chemical reaction to form fumaric acid monomethyl ester, and the product after reaction flows out of reactor through discharge section, to complete the entire reaction process;Microwave heating is carried out from molecular level, and it is different from traditional external heating mode, which can heat the inside and outside of material at the same time, in the reaction of synthesizing fumaric acid monomethyl ester, this heating mode can make reactant molecules obtain sufficient energy, overcome the activation energy of reaction, promote the progress of reaction, avoid the possible local overheating or overcooling phenomenon in traditional heating mode, ensure the uniformity of reaction temperature, and be beneficial to improve the selectivity of reaction and product quality.

[0029] ​The reactor body 1 is provided with a temperature sensor 4 and a pressure sensor 5 for monitoring the temperature and pressure in the reaction microchannel 2 respectively, the temperature sensor 4 and the pressure sensor 5 are connected with a controller, and the controller is electrically connected with the microwave heating device 3; the working principle of the temperature sensor 4 is based on the thermal sensitivity effect, and the working principle of the pressure sensor 5 is to convert the pressure signal into an electric signal; the temperature sensor 4 and the pressure sensor 5 transmit the monitored temperature and pressure signals to the controller, and the controller is a device with data processing and control functions, which compares the received actual temperature and pressure values with the pre-set target values, and if there is a deviation between the actual values and the target values, the controller calculates the parameters that need to be adjusted according to the pre-set control algorithm, and sends control signals to the microwave heating device to adjust the power of the microwave generator, so as to change the heating intensity of the reaction section, so that the temperature and pressure in the reaction microchannel are maintained within the set range; in the process of synthesizing fumaric acid monomethyl ester, appropriate temperature and pressure conditions are the key to ensure the smooth progress of the reaction and obtain high yield and high purity products; through the automatic adjustment of the controller to the microwave heating device, manual intervention is reduced, the automation degree and production efficiency of the production process are improved, and at the same time, the automatic control can also avoid the influence of human factors on the reaction, so that the production process is more stable and reliable.

[0030] Preferably, the feed inlet 211 of the feed section 21 is provided with a flow control valve 212, and the flow control valve 212 is connected with the controller; the function of the flow control valve 212 is to adjust the flow of the reactants entering the reaction microchannel 2, when the controller sends a control signal to the flow control valve 212, the actuator in the control valve will adjust the position of the valve core according to the signal, change the sectional area of the fluid passage, and then realize the precise control of the feed flow; combined with the feedback control system composed of the temperature sensor 4, the pressure sensor 5 and the controller mentioned above, when the temperature sensor 4 monitors that the temperature in the reaction microchannel 2 is higher than the set value, it may mean that the reaction is too violent, at this time, the controller will not only adjust the power of the microwave heating device 3, but also send a signal to the flow control valve 212 to reduce the feed flow at the feed inlet 211, so as to reduce the concentration of the reactants and slow down the reaction rate, so that the temperature returns to the set range, on the contrary, if the temperature is too low, the controller will appropriately increase the feed flow to improve the activity of the reaction, when the pressure sensor 5 monitors that the pressure is abnormal, the controller will also adjust the feed flow of the feed inlet 211 by adjusting the flow control valve 212, so as to maintain the stability of the pressure in the reaction microchannel 2.

[0031] The inner wall of the reaction microchannel 2 is provided with a protective coating; during the reaction process, the reaction materials can have certain corrosive properties. These substances can chemically react with the inner wall material during long-term contact with the inner wall of the reaction microchannel 2, causing the inner wall material to be eroded. The protective coating is usually composed of materials with stable chemical properties and corrosion resistance, such as special polymer coatings, ceramic coatings, etc. These coatings can isolate the reaction materials from the inner wall of the reaction microchannel 2, preventing direct contact between the materials and the inner wall material, thereby avoiding chemical reactions and protecting the inner wall. At the same time, the materials may carry some small particles or impurities. These particles can cause friction and wear to the inner wall of the reaction microchannel 2 during flow. The protective coating has a certain hardness and wear resistance, which can withstand such friction and reduce the wear of the inner wall material, maintain the smoothness of the microchannel inner wall, and ensure the normal flow of the materials.

[0032] The reaction section 22 is provided with a turbulence assembly 221, which includes a plurality of spaced turbulence plates. The turbulence plates are inclinedly arranged in the reaction microchannel 2, and the inclination directions of adjacent turbulence plates 2211 are opposite. The turbulence plates 2211 are provided with a plurality of through holes. When the reaction materials flow in the reaction microchannel 2, the turbulence plates 2211 cause the reaction materials to constantly change the flow direction during the flow process. The original laminar flow state in the microchannel is broken, and the fluid forms complex vortex and turbulent flow. This change in flow state increases the collision opportunities and mixing degree between reaction molecules. The plurality of through holes on the turbulence plates 2211 further enhance the turbulence effect. When the reaction fluid encounters the turbulence plates 2211, part of the fluid continues to flow forward through the through holes, and the other part forms a flow around the surface of the turbulence plates 2211. The fluid passing through the through holes will produce strong mixing and shearing action with the surrounding fluid after passing through the through holes, further promoting the uniform mixing of the reaction materials. At the same time, the through holes also increase the local flow rate and pressure change of the fluid, making the mass transfer in the reaction system more efficient.

[0033] The reactor body 1 is internally provided with a cooling channel 7, which is arranged in correspondence with the reaction section 22, and the inlet and outlet of the cooling channel 7 are connected with a cooling medium source and a cooling medium recovery device, respectively. The reaction for synthesizing monomethyl fumarate is usually an exothermic reaction, and a large amount of heat will be generated during the reaction in the reaction section 22. When the cooling medium flows in from the inlet of the cooling channel 7, there is a temperature difference between the cooling medium and the reaction material in the reaction section 22. According to the principle of heat exchange, heat will be transferred from the reaction material with a higher temperature to the cooling medium with a lower temperature. Through this heat exchange process, the temperature in the reaction section 22 is reduced, so that the reaction can be maintained within a suitable temperature range. The cooling medium source provides low-temperature cooling medium for the cooling channel 7. The cooling medium absorbs the heat of the reaction section 22 in the cooling channel 7, and then flows out from the outlet of the cooling channel 7 into the cooling medium recovery device. In the cooling medium recovery device, the heated cooling medium is cooled to a suitable temperature by certain cooling means, and then is circulated to the inlet of the cooling channel 7 again, forming a complete cooling medium circulation system and realizing a continuous and stable cooling effect.

[0034] The cooling medium in the cooling channel 7 is water or heat-conducting oil. Water has a large specific heat capacity, which means that a unit mass of water absorbs (or releases) a large amount of heat when its temperature is raised (or lowered) by a unit. When water exchanges heat with the high-temperature material in the reaction section 22 in the cooling channel 7, it can absorb a large amount of heat while its temperature rises relatively little. Moreover, water is a common and inexpensive resource that is easy to obtain and has low use cost. Heat-conducting oil has good heat transfer performance. Although its thermal conductivity is not as good as water, it can effectively transfer the heat of the reaction section 22 under high-temperature conditions. Moreover, the viscosity of heat-conducting oil is relatively low, so the resistance to flow in the cooling channel 7 is small, which is beneficial to reducing the conveying power and improving the operating efficiency of the cooling system.

[0035] The gas-liquid separation device 8 is connected with the outlet 231 of the discharging section 23, and a gas outlet 81 and a liquid outlet 82 are arranged at the top and the bottom of the gas-liquid separation device 8 respectively, and the liquid outlet 82 is connected with a collecting tank; during the reaction of synthesizing monomethyl fumarate, the material discharged from the discharging section 23 is usually in a gas-liquid mixed state, and the gas-liquid separation device 8 separates the gas-liquid mixture by using the density difference between the gas and the liquid; when the gas-liquid mixture enters the gas-liquid separation device 8 from the outlet 231 of the discharging section 23, the liquid is settled downward under the action of gravity because the density of the liquid is much greater than that of the gas, and the gas flows upward, and meanwhile, the structure design of the gas-liquid separation device 8 is also helpful to improve the separation effect; when the gas-liquid mixture impacts the components, the liquid is intercepted and gathered into larger droplets and then settles to the bottom more quickly, and the gas continues to rise through the gaps of the components; the separated gas is discharged through the gas outlet 81 at the top of the gas-liquid separation device 8, and the separated liquid flows into the collecting tank through the liquid outlet 82 at the bottom, so that the gas-liquid materials are collected separately; through the gas-liquid separation, the gas impurities generated during the reaction can be separated from the product, so that the gas impurities are prevented from mixing into the liquid product, thereby improving the purity of the monomethyl fumarate product, and the high-purity product has better performance and quality guarantee for subsequent product processing and application.

[0036] The utility model discloses a kind of microchannel reactors of synthetic monomethyl fumarate, when working, first the inlet of cooling channel 7 is connected with cooling medium source, the outlet of cooling channel 7 is connected with cooling medium recycling device, the liquid outlet 82 of gas-liquid separation device 8 is connected with monomethyl fumarate collecting tank, feed inlet 211 is connected with storage container;Flow control valve 212 is opened, according to preset flow ratio, raw material and catalyst are transported to the feed section 21 of reaction microchannel 2 by feed inlet 211, material enters reaction section 22 by feed section 21, and microwave generator 31 of microwave heating device 3 generates microwave, which is transmitted to reaction section 22 by waveguide 32 to heat material;In reaction section 22, turbulence plate 2211 of turbulence assembly 221 makes material form turbulent flow, and mixing and mass transfer are enhanced;Temperature sensor 4 and pressure sensor 5 monitor the temperature and pressure in reaction microchannel 2 in real time, and data is transmitted to controller, and controller adjusts the power of microwave heating device 3 according to monitoring data, to ensure that reaction is carried out at suitable temperature and pressure;Cooling medium in cooling channel 7 circulates according to reaction temperature requirement, to control reaction temperature;Material after reaction passes through discharging section 23, and then enters gas-liquid separation device 8, gas product is discharged from gas outlet 81, and liquid product enters collecting tank from liquid outlet 82.

[0037] The micro-channel reactor for synthesizing monomethyl fumarate has a common mechanical installation mode, connection mode or setting mode, and can be implemented as long as the beneficial effects can be achieved.

[0038] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should be considered as the protection scope of the present application.

Claims

1. A microchannel reactor for the synthesis of monomethyl fumarate, characterized in that, The utility model relates to a microwave heating reactor, which comprises: a reactor body (1) with a reaction microchannel (2) inside, the reaction microchannel (2) being composed of a feeding section (21), a reaction section (22) and a discharging section (23) in sequence; a microwave heating device (3) installed outside the reactor body (1) and corresponding to the reaction section (22), used for microwave heating of materials in the reaction section (22), the microwave heating device (3) comprising a microwave generator (31) and a waveguide (32), microwaves generated by the microwave generator (31) being transmitted to the reaction section (22) through the waveguide (32).

2. The microchannel reactor for the synthesis of monomethyl fumarate according to claim 1, characterized in that, The reactor body (1) is provided with a temperature sensor (4) and a pressure sensor (5) for monitoring the temperature and pressure in the reaction microchannel (2) respectively, the temperature sensor (4) and the pressure sensor (5) being connected with a controller, and the controller being electrically connected with the microwave heating device (3).

3. The microchannel reactor for the synthesis of monomethyl fumarate according to claim 2, characterized in that, The feeding section (21) is provided with a flow control valve (212) at a feeding port (211), the flow control valve (212) being connected with the controller.

4. The microchannel reactor for the synthesis of monomethyl fumarate of claim 1, wherein, The inner wall of the reaction microchannel (2) is provided with a protective coating.

5. The microchannel reactor for the synthesis of monomethyl fumarate of claim 1, wherein, The reaction section (22) is provided with a turbulence assembly (221), the turbulence assembly (221) comprising a plurality of turbulence plates arranged at intervals, the turbulence plates being arranged obliquely in the reaction microchannel (2), the adjacent turbulence plates (2211) being arranged in opposite directions, and the turbulence plates (2211) being provided with a plurality of through holes.

6. The microchannel reactor for the synthesis of monomethyl fumarate of claim 1, wherein, The reactor body (1) is provided with a cooling channel (7) inside, the cooling channel (7) being corresponding to the reaction section (22), and the inlet and outlet of the cooling channel (7) being connected with a cooling medium source and a cooling medium recovery device respectively.

7. The microchannel reactor for the synthesis of monomethyl fumarate according to claim 6, characterized in that, The cooling medium in the cooling channel (7) is water or heat-conducting oil.

8. The microchannel reactor for the synthesis of monomethyl fumarate of claim 1, wherein, The discharging section (23) is connected with a gas-liquid separation device (8) at a discharging port (231), the gas-liquid separation device (8) being provided with a gas outlet (81) at the top and a liquid outlet (82) at the bottom, and the liquid outlet (82) being connected with a collection tank.

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