CN111617710A - Industrial multifunctional micro-channel reactor production system - Google Patents
Industrial multifunctional micro-channel reactor production system Download PDFInfo
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- CN111617710A CN111617710A CN202010513933.6A CN202010513933A CN111617710A CN 111617710 A CN111617710 A CN 111617710A CN 202010513933 A CN202010513933 A CN 202010513933A CN 111617710 A CN111617710 A CN 111617710A
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Abstract
The invention discloses an industrial multifunctional microchannel reactor production system, which comprises a skid-mounted microchannel reactor unit, a feeding system, a heat exchange system and a DCS (distributed control system), wherein the skid-mounted microchannel reactor unit comprises: each skid-mounted microchannel reactor unit is connected with an independent feeding system; the centralized control system is remotely connected with the reactor unit micro control system and the heat exchange system to form a DCS control system; the n (n is more than or equal to 2) skid-mounted microchannel reactor units are arranged in parallel with the independent feeding system connected with the skid-mounted microchannel reactor units, and the skid-mounted microchannel reactor units are connected with the heat exchange system and form the industrial multifunctional microchannel reactor production system together with the DCS control system. The invention has excellent performance for various chemical reactions in industry, and can customize the optimal microchannel reaction device according to the process condition, shorten the reaction time, reduce the solvent consumption, improve the reaction selectivity, improve the product yield and the product purity, eliminate the potential safety hazard and reduce the environmental pollution.
Description
Technical Field
The invention relates to the technical field of organic compound production, in particular to an industrial multifunctional microchannel reactor production system.
Background
In the technical field of organic compound production, such as the specific fields of fine chemical industry, pharmaceutical chemical industry, pesticides, auxiliaries and the like, homogeneous phase, heterogeneous phase, normal pressure, high-pressure reaction and polymerization reaction of liquid/liquid, gas/liquid and gas/solid/liquid are required to be amplified step by step from reaction kettle experiments to industrial production in laboratories to enter large-scale production, the amplification process involves many variables and factors, the amplification process period is long, the reactor module is enlarged to bring about factors such as flowing and mixing degree, and the performance of the reactor is easy to be reduced, meanwhile, due to the inherent structure of the reactor, the mass transfer resistance is large, the phenomena such as back mixing and the like are difficult to overcome, sometimes, the use amount of a solvent is increased, the overall reaction time is too long, byproducts are increased, the post-treatment separation is difficult, the three-waste treatment amount is increased, and the like; meanwhile, the reaction heat energy of the reaction kettle is difficult to conduct due to structural limitation, the interior of the reaction kettle is heated unevenly, and the pregnant potential safety hazard is more prominent in the dangerous processes such as nitration, hydrogenation, oxidation and the like.
The first international conference on "microchannels and micro-miniature channels" defines the characteristic dimensions of microchannels in the range of 10 μm to 3.0mm, since microchannel reactors can contain up to several millions of microchannels, high throughput can be achieved, and the throughput of the channel reactor can be scaled up or down according to the requirements of its application.
Since the microchannel reactor employs a number of amplification, integrated amplification, i.e., the parallel operation of the same microchannel reactor unit is repeated to achieve the amplified target output.
The skid-mounted structure is an integration mode that functional components are integrated on an integral base and can be integrally installed and moved. Although the microchannel reactor has been used in industrial production, the microchannel reactor adopting the skid-mounted structure is still a blank in industrial production of general organic compounds.
Disclosure of Invention
In view of the above, the present invention aims to provide an industrial multifunctional microchannel reactor production system, which adopts a skid-mounted microchannel reactor in industrial production, and has excellent performance in the aspects of violent exothermic reaction, unstable reaction of reactants or products, rapid reaction with strict reactant proportioning requirements, dangerous chemical reaction, high-temperature and high-pressure reaction, and the like, and can customize an optimal microchannel reactor according to the process conditions, shorten the reaction time, reduce the solvent consumption, improve the reaction selectivity, improve the product yield and the product purity, eliminate potential safety hazards, and reduce environmental pollution.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a multi-functional microchannel reactor production system of industry, includes sled dress formula microchannel reactor unit, charge-in system, heat transfer system and DCS control system:
each skid-mounted microchannel reactor unit is connected with an independent feeding system;
the DCS control system comprises a reactor unit micro control system, a heat exchange system control system and a centralized control system, wherein the centralized control system is remotely connected with the reactor unit micro control system and the heat exchange system to form the DCS control system;
the n (n is an integer more than or equal to 2) skid-mounted microchannel reactor units are connected with the independent feeding system connected with the skid-mounted microchannel reactor units in parallel, and the skid-mounted microchannel reactor units are connected with the heat exchange system and form the industrial multifunctional microchannel reactor production system together with the DCS control system.
Further, the skid-mounted microchannel reactor unit comprises a first microchannel reactor unit, a second microchannel reactor unit, a pipeline, a valve and a thermocouple, wherein the first microchannel reactor unit is 10 microchannel reactors which are skid-mounted together and made of hastelloy materials, the 1 st plate is provided with three feed inlets and a discharge outlet, the 2 nd to 10 th plates are respectively provided with a feed inlet and a discharge outlet, the 1 st to 10 th plates are connected in series, namely, the discharge outlet of the 1 st plate is connected with the feed inlet of the 2 nd plate by a pipeline, the discharge outlet of the 2 nd plate is connected with the feed inlet of the 3 rd plate by a pipeline until the 10 plates are connected in series, the second microchannel reactor is 10 microchannel reactors which are skid-mounted together and made of silicon carbide materials, the 1 st plate is provided with four feed inlets and a discharge outlet, the 2 nd to 10 th plates are respectively provided with a feed inlet and a discharge outlet, the 1 st to 10 th plates are connected in series, namely the discharge port of the 1 st plate is connected with the feed port of the 2 nd plate by a pipeline, the discharge port of the 2 nd plate is connected with the feed port of the 3 rd plate by a pipeline until the 10 plates are connected in series, each reactor on the first microchannel reactor unit and the second microchannel reactor unit is provided with a thermocouple and a heat exchange channel, three feed ports on the 1 st plate of the first microchannel reactor unit and the front three feed ports on the 1 st plate of the second microchannel reactor unit are respectively connected in parallel in sequence, an electromagnetic switch valve is arranged at a parallel node, the electromagnetic switch valve is also connected with a feed pipeline of an independent feed system to convey three different raw materials to the first microchannel reactor unit and/or the second microchannel reactor unit, the discharge port of the first microchannel reactor unit is connected with the discharge port of the second microchannel reactor unit by a pipeline, and a four-way reversing valve is arranged in the middle of the pipeline, two pipelines are connected to the four-way reversing valve, one pipeline is communicated with the fourth feed inlet of the second microchannel reactor unit, and the other pipeline is a product outlet pipe.
A four-way one-way valve is arranged on a heat exchange channel port of each reactor of the skid-mounted microchannel reactor unit and is respectively connected with three heat exchange system heat exchange pipelines with different temperatures.
Further, the capacity of each reactor of the first microchannel reactor unit is 0.2-0.3L, and the total capacity is 2-3L; the capacity of each reactor of the second microchannel reactor unit is 0.2-0.3L, and the total capacity is 2-3L.
Furthermore, the feeding system is used for feeding liquid, each independent feeding system comprises three identical feeding pipelines, each feeding pipeline is sequentially provided with a feeding pump, a flowmeter and a one-way valve, an outlet of each feeding pump is provided with a pressure sensor and a safety bypass, and a safety valve is arranged on each safety bypass to guarantee pipeline blockage and timely pressure relief under abnormal pressure conditions after the pumps are pumped.
Furthermore, the feeding pump is a pulse-free three-pump head diaphragm metering pump.
Further, the heat exchange system comprises three identical heat exchange devices, each heat exchange device comprises a heat conduction oil storage tank, an oil inlet pump, a check valve, an electromagnetic flow regulating valve, a pressure transmitter, a spiral wound tube type heat exchanger, a temperature sensor and a pipeline, the heat conduction oil storage tank is connected with the spiral wound tube type heat exchanger through the pipeline, the oil inlet pump, the pressure transmitter, the check valve and the electromagnetic flow regulating valve are sequentially arranged on the pipeline, the spiral wound tube type heat exchanger is connected with a heat exchange channel on the skid-mounted microchannel reactor unit through the pipeline, the temperature sensor is arranged at an outlet of the spiral wound tube type heat exchanger, and the heat exchange channel on the skid-mounted microchannel reactor unit is connected with the heat conduction oil storage tank through the pipeline.
The heat conduction oil in the heat conduction oil storage tank is conveyed into the spiral wound tube type heat exchanger by the oil inlet pump, the heat conduction oil exchanges heat with a refrigerant or a heat medium of public works, after heat exchange, the heat conduction oil enters the heat exchange main pipe of the skid-mounted micro-channel reactor unit to exchange heat for the skid-mounted micro-channel reactor unit, and finally, the heat conduction oil is collected and flows back to the heat conduction oil storage tank to form a closed loop.
Furthermore, the reactor unit micro-control system is arranged on the site of the skid-mounted microchannel reactor unit, each skid-mounted microchannel reactor unit and the feeding system connected with the same are provided with an independent reactor micro-control system comprising a process instrument and an execution mechanism, and when the skid-mounted microchannel reactor unit works, the skid-mounted microchannel reactor unit can carry out site operation on equipment and real-time monitoring on the site working state.
The process instrument comprises a flow meter, a pressure transmitter and a thermocouple, wherein the flow meter and the pressure transmitter are installed on a feeding system, the thermocouple is arranged in the skid-mounted microchannel reactor, and the actuating mechanism comprises a feeding pump on the feeding system, the feeding system and valves on the skid-mounted microchannel reactor unit.
Furthermore, the heat exchange system control system is a control system arranged on the heat exchange device site and comprises a process instrument and an execution mechanism, the process instrument is a pressure transmitter and a temperature sensor on the heat exchange device pipeline, the execution mechanism comprises an oil inlet pump and a flow regulating valve, and when the heat exchange system works, the heat exchange device is subjected to site operation and real-time monitoring of a site working state.
Furthermore, the centralized control system comprises a central control computer, and the central control computer is connected with all the reactor unit micro control systems and all the heat exchange system control systems, and is used for monitoring, operating and controlling the skid-mounted microchannel reactor unit and the heat exchange system in real time.
The invention relates to an industrial multifunctional microchannel reactor production system, which can be formed by connecting skid-mounted microchannel reactor units with different quantities in parallel to form industrial production systems with different scales.
The invention relates to an industrial multifunctional microchannel reactor production system, wherein a skid-mounted microchannel reactor unit has four different working modes:
the first mode is as follows: the first microchannel reactor unit is used alone.
And a second mode: the second microchannel reactor unit is used alone.
And a third mode: the first microchannel reactor unit and the second microchannel reactor unit are connected in parallel for use.
And a fourth mode: a first microchannel reactor unit and a second microchannel reactor unit are connected in series for use.
The invention relates to an industrial multifunctional microchannel reactor production system, which has the multifunctional performance of freely switching four different working modes.
The invention has the beneficial effects that:
1. the industrial multifunctional microchannel reactor production system has the advantages that the multifunctional performance enables the skid-mounted microchannel reactor unit to be capable of industrially producing more chemical products, and the production system is more practical.
2. According to the industrial multifunctional microchannel reactor production system, each skid-mounted microchannel reactor unit is connected with three different heat exchange devices, three-temperature-zone control can be realized no matter what mode the skid-mounted microchannel reactor unit is in, and heat conduction oil at three temperatures can be selectively introduced into a reaction plate of any microchannel reactor unit by adjusting a valve on a heat exchange pipeline, so that the multifunctional industrial microreactor can realize multiple functions of reaction, heat exchange quenching and the like, the whole set of microchannel reactor comprises a plurality of intermediate feeding points, and the use flexibility is higher.
3. According to the industrial multifunctional microchannel reactor production system, the whole equipment is arranged by adopting the skid-mounted units, the installation and the combination are very convenient, and the industrial production of different scales is realized according to different quantities of the skid-mounted units.
4. According to the industrial multifunctional microchannel reactor production system, the first microchannel reactor and the second microchannel reactor in the skid-mounted microchannel reactor unit are respectively prized, and the two microchannel reactors can be stacked up and down or tiled left and right or tiled front and back, so that the purposes of land saving and flexible application are achieved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
In the figure: the method comprises the following steps of 1-skid-mounted microchannel reactor unit, 2-feeding system, 3-heat exchange system and 4-DCS control system.
FIG. 2 is a schematic diagram of the DCS control system of the present invention.
In the figure: 41-a reactor unit micro-control system, 42-a heat exchange system control system and 43-a centralized control system.
FIG. 3 is a schematic view of chemical pipeline connections for a skid-mounted microchannel reactor unit of the present invention.
In the figure: 1A-a first microchannel reactor unit, 1B-a second microchannel reactor unit, 2A, 2B and 2C-feeding pipelines of a feeding system, 5A, 5B and 5C-electromagnetic switch valves and 5D-four-way reversing valves.
FIG. 4 is a schematic view of a feed system of the present invention.
In the figure: 21-feeding pump, 22-flowmeter, 23-one-way valve, 24-pressure sensor, 25-safety bypass, 2A, 2B and 2C-feeding pipeline of feeding system.
FIG. 5 is a schematic view of the heat exchange piping connections of the skid-mounted microchannel reactor unit of the present invention.
In the figure: 1A-a first microchannel reactor unit, 1B-a second microchannel reactor unit, and 3A, 3B, 3C-heat exchange device heat exchange pipes.
FIG. 6 is an enlarged partial schematic view of the heat exchange piping of the skid-mounted microchannel reactor unit of the present invention connected to the reactor.
In the figure: 3A, 3B and 3C-heat exchange device heat exchange pipelines and a 5F-four-way check valve.
FIG. 7 is a schematic view of a heat exchange system of the present invention.
In the figure: 3A, 3B and 3C-heat exchange device heat exchange pipelines, 31-a heat transfer oil storage tank, 32-an oil inlet pump, 33-a one-way valve, 34-an electromagnetic flow regulating valve, 35-a pressure transmitter, 36-a spiral winding pipe type heat exchanger, a temperature sensor and 37-pipelines.
FIG. 8 is a schematic view of the mode of operation of the skid mounted microchannel reactor unit of the present invention.
FIG. 9 is a schematic view of the second mode of operation of the skid mounted microchannel reactor unit of the present invention.
FIG. 10 is a schematic view of the third mode of operation of the skid mounted microchannel reactor unit of the present invention.
FIG. 11 is a fourth schematic view of the mode of operation of the skid mounted microchannel reactor unit of the present invention.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which specific embodiments of the invention are shown. Various advantages and benefits of the present invention will become apparent to those of ordinary skill in the art upon reading the following detailed description of the specific embodiments. It should be understood, however, that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. The following embodiments are provided so that the invention may be more fully understood. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by those of skill in the art to which this application belongs.
Example 1
As shown in fig. 1, an industrial multifunctional microchannel reactor production system comprises a skid-mounted microchannel reactor unit 1, a feeding system 2, a heat exchange system 3 and a DCS control system 4:
each skid-mounted microchannel reactor unit 1 is connected with an independent feeding system 2;
as shown in fig. 2, the DCS control system 4 includes a reactor unit micro-control system 41, a heat exchange system control system 42 and a centralized control system 43, and the centralized control system 43 is remotely connected to the reactor unit micro-control system 41 and the heat exchange system control system 42 to form the DCS control system 4;
as shown in figure 1, n (n is more than or equal to 2) skid-mounted microchannel reactor units 1 and an independent feeding system 2 connected with the skid-mounted microchannel reactor units are arranged in parallel, and the skid-mounted microchannel reactor units 1 are connected with a heat exchange system 3 and form an industrial multifunctional microchannel reactor production system together with a DCS (distributed control system) 4.
As shown in fig. 3, the skid-mounted microchannel reactor unit 1 comprises a first microchannel reactor unit 1A, a second microchannel reactor unit 1B, pipelines, valves and thermocouples, wherein the first microchannel reactor unit 1A is a skid-mounted 10 microchannel reactor made of hastelloy, each reactor of the first microchannel reactor unit 1A has a capacity of 0.26L and a total capacity of 2.6L, the 1 st plate is provided with three feed inlets and one discharge outlet, the 2 nd to 10 th plates are respectively provided with one feed inlet and one discharge outlet, the 1 st plate is connected in series to the 10 th plate, that is, the discharge outlet of the 1 st plate is connected with the feed inlet of the 2 nd plate by a pipeline, the discharge outlet of the 2 nd plate is connected with the feed inlet of the 3 rd plate by a pipeline until the 10 th plate is connected in series, the second microchannel reactor 1B is a skid-mounted 10 microchannel reactor made of silicon carbide, the capacity of each reactor of the second microchannel reactor unit 1B is 0.26L, the total capacity is 2.6L, the 1 st piece is provided with four feed inlets and a discharge outlet, the 2 nd to 10 th pieces are respectively provided with a feed inlet and a discharge outlet, the 1 st piece to the 10 th piece are connected in series, namely, the discharge outlet of the 1 st piece is connected with the feed inlet of the 2 nd piece by a pipeline, the discharge outlet of the 2 nd piece is connected with the feed inlet of the 3 rd piece by a pipeline until the 10 pieces are connected in series, each reactor on the first microchannel reactor unit 1A and the second microchannel reactor unit 1B is provided with a thermocouple and a heat exchange channel, three feed inlets on the 1 st piece of the first microchannel reactor unit 1A and the previous three feed inlets on the 1 st piece of the second microchannel reactor unit 1B are respectively connected in parallel in sequence, namely, the first feed inlet on the 1 st piece of the first microchannel reactor unit 1A and the first feed inlet on the 1 st piece of the second microchannel reactor unit 1B are respectively connected in parallel in sequence The material openings are connected in parallel, an electromagnetic switch valve 5A is arranged at a node, a feeding pipeline 2A of a feeding system with an independent last interface of the electromagnetic switch valve 5A is connected to provide raw materials A for a first microchannel reactor unit 1A and/or a second microchannel reactor unit 1B, a second feeding port on a 1 st plate of the first microchannel reactor unit 1A is connected in parallel with a second feeding port on a 1 st plate of the second microchannel reactor unit 1B, an electromagnetic switch valve 5B is arranged at the node, a feeding pipeline 2B of a feeding system with an independent last interface of the electromagnetic switch valve 5B is connected to provide raw materials B for the first microchannel reactor unit 1A and/or the second microchannel reactor unit 1B, a third feeding port on the 1 st plate of the first microchannel reactor unit is connected in parallel with a third feeding port on the 1 st plate of the second microchannel reactor unit, an electromagnetic switch valve 5C is arranged at the node, and a feeding pipeline 2C of a feeding system with an independent last interface of the electromagnetic switch valve 5C is connected to provide raw materials C for the first microchannel reactor unit 1A and/or the second microchannel reactor unit 1B. The discharge port of the first microchannel reactor unit 1A is connected with the discharge port of the second microchannel reactor unit 1B through a pipeline, a four-way reversing valve 5D is arranged in the middle of the pipeline, the four-way reversing valve 5D is connected with two pipelines, one pipeline leads to the fourth feed port of the second microchannel reactor unit 1B, and the other pipeline is a product outlet pipe.
The first microchannel reactor unit 1A and the second microchannel reactor unit 1B in the skid-mounted microchannel reactor unit 1 are stacked up and down or tiled left and right, can be flexibly applied, and achieve the purpose of saving occupied area or being easy to arrange.
As shown in fig. 5 and 6, a heat exchange channel port of each reactor of the first microchannel reactor unit 1A is provided with a four-way check valve 5F, and the four-way check valve is respectively connected to heat exchange pipes 3A, 3B, and 3C of the heat exchange devices with different temperatures.
As shown in fig. 4, the feeding system 2 of the feeding system is a liquid feeding system, each independent feeding system 2 includes three identical feeding pipelines, each feeding pipeline is sequentially provided with a pulse-free three-pump-head diaphragm metering pump 21, a flow meter 22 and a one-way valve 23, an outlet of the three-pump-head diaphragm metering pump 21 is provided with a pressure sensor 24 and a safety bypass 25, and the safety bypass 25 is provided with a safety valve to ensure that the pipeline is blocked and pressure is released in time when the pressure is abnormal after the pump.
As shown in fig. 7, the heat exchange system includes three identical heat exchange devices, each of which includes a heat-conducting oil storage tank 31, an oil inlet pump 32, a check valve 33, an electromagnetic flow regulating valve 34, a pressure transmitter 35, a spiral wound tube heat exchanger 36, a temperature sensor and a pipeline 37, the heat-conducting oil storage tank 31 is connected to the spiral wound tube heat exchanger 36 through the pipeline 37, the oil inlet pump 31, the pressure transmitter 32, the check valve 33 and the electromagnetic flow regulating valve 34 are sequentially arranged on the pipeline 37, and the temperature sensor is arranged at an outlet of the spiral wound tube heat exchanger 36;
and the heat exchange pipelines of the three heat exchange devices of the heat exchange system 3 are connected with the heat exchange channels on the skid-mounted micro-channel reactor unit 1.
The heat conducting oil in the heat conducting oil storage tank 31 is conveyed into the spiral wound tube type heat exchanger 36 by the oil inlet pump 32, the heat conducting oil exchanges heat with a refrigerant or a heat medium of public works, after heat exchange, the heat conducting oil enters the heat exchange main pipe of the skid-mounted micro-channel reactor unit 1 to exchange heat for the skid-mounted micro-channel reactor unit 1, and finally, the heat conducting oil is collected and flows back to the heat conducting oil storage tank 31 to form a closed loop.
As shown in FIG. 2, the reactor unit micro-control system 41 is arranged on site of the skid-mounted microchannel reactor unit 1, and each skid-mounted microchannel reactor unit 1 and the feeding system 2 connected with the same are provided with an independent reactor micro-control system 41 which comprises a process instrument and an actuating mechanism, so that when the skid-mounted microchannel reactor unit 1 works, the field operation of equipment and the real-time monitoring of the field working state can be carried out.
The process instrument comprises a flow meter, a pressure transmitter and a thermocouple, wherein the flow meter and the pressure transmitter are installed on a feeding system 2, the thermocouple is arranged inside a skid-mounted micro-channel reactor 1, and an execution mechanism comprises a feeding pump on the feeding system 2, the feeding system 2 and valves on the skid-mounted micro-channel reactor unit 1.
The heat exchange system control system 42 is a control system arranged on the heat exchange device site, and comprises a process instrument and an execution mechanism, wherein the process instrument is a pressure transmitter and a temperature sensor on the heat exchange system 3 pipeline, the execution mechanism comprises an oil inlet pump and a flow regulating valve, and when the heat exchange system works, the heat exchange device is subjected to site operation and site working state real-time monitoring.
The centralized control system 43 comprises a central control computer, and the central control computer is connected with all the reactor unit micro control systems 41 and all the heat exchange system control systems 42, and is used for monitoring, operating and controlling the skid-mounted micro-channel reactor unit 1 and the heat exchange system 2 in real time.
The DCS control system controls two most important parameters of flow and temperature in the production process, and the control method comprises the following specific steps:
the flow sensor used for flow control only detects the output flow of the metering pump in real time and displays the output flow on the control system, and once the condition that the difference between the displayed flow of the metering pump and the measured data of the flow sensor is large occurs, the pump is stopped to calibrate.
The temperature control mode is as follows: by monitoring the temperature of the micro-reverse outlet heat exchange pipeline, the outlet temperature is stabilized at the reaction temperature of +/-5 ℃, once the temperature exceeds the required temperature range, the flow of the heat exchange medium is controlled through a flow regulating valve on the outlet pipeline of the heat exchanger, meanwhile, the flow of the refrigerant or the heat medium of the public engineering is set to be the maximum value of calculation when the heat exchanger starts to work, and after the operation is stable, the flow of the refrigerant and the heat medium can be gradually reduced, but the micro-reverse heat exchange condition is met.
The invention relates to an industrial multifunctional microchannel reactor production system, wherein a skid-mounted microchannel reactor unit 1 has four different working modes:
as shown in fig. 8, mode one: the first microchannel reactor unit is in a single use mode, three different raw materials enter the first microchannel reactor unit, and are continuously mixed and reacted in each reaction channel to react in the 10 th reaction channel to generate a required product, and in the reaction process, heat is continuously released, and the released heat is absorbed and taken away by heat exchange oil of a heat exchange system, so that the reaction temperature stability of the first microchannel reactor unit is ensured.
Taking the production of edible glyceryl triacetate as an example, benzene, a carcinogenic chemical raw material, is needed in the conventional glyceryl triacetate production process, the whole normal production process is complex, the obtained glyceryl triacetate is low in purity, and purification is needed in the later period.
In the mode, the edible glyceryl triacetate is produced, the three liquid raw materials are respectively sulfuric acid, glacial acetic acid and glycerol, the liquid inlet amount of the sulfuric acid is controlled to be 10mL/min by a feeding system, the liquid inlet amount of the glacial acetic acid is 1mL/min, the liquid inlet amount of the glycerol is 5mL/min, the reaction temperature is accurately controlled to be 130 ℃, and the purity of the glyceryl triacetate of the produced product is up to 99.5 percent after the sulfuric acid is removed.
As shown in fig. 9, mode two: the second microchannel reactor unit is in a single use mode, three different raw materials enter the second microchannel reactor unit, and are continuously mixed and reacted in each reaction channel to react in the 10 th reaction channel to generate a required product, and in the reaction process, heat is continuously released, and the released heat is absorbed and taken away by heat exchange oil of a heat exchange system, so that the reaction temperature stability of the second microchannel reactor unit is ensured.
Taking chlorobenzene nitration as an example, chlorobenzene nitration is a rapid strong exothermic reaction, and in a traditional reaction kettle, the heat released by the reaction cannot be released in time and is conducted away, so that the reaction temperature cannot be accurately controlled, the reaction stirring is not uniform, side reactions are easy to occur, and the yield of nitrochlorobenzene is very low.
In the mode, nitrochlorobenzene is produced, three liquid raw materials are chlorobenzene, nitric acid and sulfuric acid respectively, a feeding system controls the liquid inlet quantity of the chlorobenzene to be 5mL/min, the liquid inlet quantity of the nitric acid to be 6.5mL/min and the liquid inlet quantity of the sulfuric acid to be 19.5mL/min, the reaction temperature is accurately controlled to be 80 ℃, the conversion rate of nitrochlorobenzene generated by chlorobenzene nitration reaches 72.6%, and the ratio of o-nitrochlorobenzene to p-nitrochlorobenzene in the nitrochlorobenzene is 1: 2.
As shown in fig. 10, mode three: the first microchannel reactor unit and the second microchannel reactor unit are connected in parallel in use mode, three different raw materials enter the first microchannel reactor unit and the second microchannel reactor unit simultaneously, and are continuously mixed and reacted in each reaction channel of each reactor unit until the reaction channel of the 10 th reactor unit is completely reacted to generate a required product.
Taking the production of an organic chemical intermediate, benzylidene acetone, as an example, the conventional production process also requires the extraction of benzene, and the whole process is complex and high in energy consumption.
In the mode, the benzalacetone is produced, three liquid raw materials are benzaldehyde, acetone and a 10% sodium hydroxide solution respectively, the liquid inlet amount of the benzaldehyde is controlled to be 40mL/min by a feeding system, the liquid inlet amount of the acetone is 40mL/min, the liquid inlet amount of the 10% sodium hydroxide solution is 80mL/min, the reaction temperature is accurately controlled to be 32 ℃, and the obtained product is added with hydrochloric acid for neutralization to obtain the solid benzalacetone.
As shown in fig. 11, mode four: the first microchannel reactor unit and the second microchannel reactor unit are connected in series in a use mode, three different raw materials enter the first microchannel reactor unit, and are continuously mixed and reacted in each reaction channel to the 10 th reaction channel, so that the reaction cannot be completely reacted, and then enter the second microchannel reactor unit through a pipeline, and the reaction cannot be completely reacted until the 10 th reaction channel of the second microchannel reactor unit, so that a required product is generated.
Taking the synthesis of propylene oxide as an example, the traditional propylene oxide synthesis method has many and complex processes and needs purification treatment in the later stage.
In the mode, the propylene oxide is produced, three different raw materials are respectively liquid propylene, hydrogen peroxide and methanol, the liquid inlet quantity of the liquid propylene is controlled by a feeding system to be 10mL/min, the liquid inlet quantity of the hydrogen peroxide is 20mL/min, the liquid inlet quantity of the methanol is 120mL/min, the reaction temperature is accurately controlled to be 60 ℃ in a first micro-channel reactor unit, the reaction temperature is gradually reduced from 60 ℃ to 4 ℃ at an outlet product temperature in a second micro-channel reactor unit, and the yield of the propylene oxide can reach 94.7%.
The invention relates to an industrial multifunctional microchannel reactor production system, which has the multifunctional performance of freely switching four different working modes.
No matter the mode is adopted, the three-temperature-zone control of the reactor can be realized, and the heat conduction oil at three temperatures can be selectively introduced into any reaction sheet by adjusting the valve on the heat exchange branch, so that the multifunctional industrial microreactor can realize multiple functions of reaction, heat exchange quenching and the like, the whole set of microchannel reactor comprises a plurality of intermediate feeding points, and the use flexibility is higher.
The invention relates to an industrial multifunctional microchannel reactor production system, wherein skid-mounted microchannel reactor units with different quantities are connected in parallel to form industrial production systems with different scales: for example, an industrial production system classified according to the number of skid-mounted microchannel reactor units, an industrial production system in which the number of skid-mounted microchannel reactor units is within 1 ten thousand, belongs to a small-scale industrial production system, a system in which the number of skid-mounted microchannel reactor units is 1 ten thousand to 100 ten thousand, belongs to a medium-scale industrial production system, and a system in which the number of skid-mounted microchannel reactor units exceeds 100 ten thousand, belongs to a large-scale industrial production system.
According to the industrial multifunctional microchannel reactor production system, a part of the skid-mounted microchannel reactor units are replaced by raw materials, so that other different products can be produced simultaneously, and the like.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. The utility model provides a multi-functional microchannel reactor production system of industry which characterized in that: the device comprises a skid-mounted microchannel reactor unit (1), a feeding system (2), a heat exchange system (3) and a DCS control system (4):
each skid-mounted microchannel reactor unit (1) is connected with an independent feeding system (2);
the DCS control system (4) comprises a reactor unit micro-control system (41), a heat exchange system control system (42) and a centralized control system (43), wherein the centralized control system (43) is remotely connected with the reactor unit micro-control system (41) and the heat exchange system control system (42) to form the DCS control system (4);
the n skid-mounted microchannel reactor units (1) and the independent feeding system (2) connected with the skid-mounted microchannel reactor units are arranged in parallel, and the skid-mounted microchannel reactor units (1) are connected with the heat exchange system (3) and form an industrial multifunctional microchannel reactor production system together with the DCS control system (4); wherein n is an integer of 2 or more.
2. The industrial multi-functional microchannel reactor production system of claim 1, wherein: the skid-mounted microchannel reactor unit (1) comprises a first microchannel reactor unit (1A), a second microchannel reactor unit (1B), a pipeline and a thermocouple, wherein the first microchannel reactor unit (1A) is 10 microchannel reactors which are skid-mounted together and made of Hastelloy materials, the 1 st microchannel reactor unit is provided with three feed inlets and a discharge outlet, the 2 nd to 10 th microchannels are respectively provided with a feed inlet and a discharge outlet, the 1 st microchannel reactor unit and the 10 th microchannels are connected in series, namely the discharge outlet of the 1 st microchannel reactor unit is connected with the feed inlet of the 2 nd microchannel reactor unit through a pipeline, the discharge outlet of the 2 nd microchannel reactor unit is connected with the feed inlet of the 3 rd microchannel reactor unit through a pipeline until the 10 microchannels are connected in series, the second microchannel reactor unit (1B) is 10 microchannel reactors which are skid-mounted together and made of silicon carbide materials, the 1 st microchannel reactor unit is provided with four feed inlets and a discharge outlet, the 2 nd to 10 th microchannels are respectively provided with a feed inlet and a discharge outlet, the 1 st to 10 th plates are connected in series, namely the discharge hole of the 1 st plate is connected with the feed inlet of the 2 nd plate by a pipeline, the discharge hole of the 2 nd plate is connected with the feed inlet of the 3 rd plate by a pipeline until the 10 plates are connected in series, each reactor on the first microchannel reactor unit (1A) and the second microchannel reactor unit (1B) is provided with a thermocouple and a heat exchange channel, three feed inlets on the 1 st plate of the first microchannel reactor unit (1A) are respectively connected in parallel with the first three feed inlets on the 1 st plate of the second microchannel reactor unit (1B) in sequence, namely the first feed inlet on the 1 st plate of the first microchannel reactor unit (1A) is connected in parallel with the first feed inlet on the 1 st plate of the second microchannel reactor unit (1B), an electromagnetic switch valve (5A) is arranged, and the last feed pipeline (2A) of the feed system with an independent interface of the electromagnetic switch valve (5A) is connected at a node, a second feed inlet on the 1 st plate of the first microchannel reactor unit (1A) is connected with a second feed inlet on the 1 st plate of the second microchannel reactor unit (1B) in parallel, an electromagnetic switch valve (5B) is arranged at a node, a feed pipeline (2B) of a feed system with an independent last interface of the electromagnetic switch valve (5B) is connected, a third feed inlet on the 1 st plate of the first microchannel reactor unit (1A) is connected with a third feed inlet on the 1 st plate of the second microchannel reactor unit (1B) in parallel, an electromagnetic switch valve (5C) is arranged at the node, a feed pipeline 2C of a feed system with an independent last interface of the electromagnetic switch valve (5C) is connected, a discharge outlet of the first microchannel reactor unit (1A) is connected with a discharge outlet of the second microchannel reactor unit (1B) through a pipeline, and a four-way reversing valve (5D) is arranged in the middle of the pipeline, the four-way reversing valve (5D) is connected with two pipelines, one pipeline is communicated with a fourth feed inlet of the second microchannel reactor unit (1B), and the other pipeline is a product outlet pipe;
a four-way one-way valve (5F) is arranged on a heat exchange channel port of each reactor of the skid-mounted microchannel reactor unit (1), and the four-way one-way valve (5F) is respectively connected with heat exchange device heat exchange pipelines (3A, 3B and 3C) with three different temperatures.
3. The industrial multi-functional microchannel reactor production system of claim 2, wherein: the capacity of each reactor of the first microchannel reactor unit (1A) is 0.2-0.3L, and the total capacity is 2-3L; the capacity of each sheet of reactor of the second microchannel reactor unit (1B) is 0.2-0.3L, and the total capacity is 2-3L.
4. The industrial multi-functional microchannel reactor production system of claim 1, wherein: the feeding system (2) is used for feeding liquid, each independent feeding system (2) comprises three identical feeding pipelines, a feeding pump (21), a flowmeter (22) and a one-way valve (23) are sequentially arranged on each feeding pipeline, an outlet of each feeding pump (21) is provided with a pressure sensor (24) and a safety bypass (25), and a safety valve is arranged on each safety bypass (25).
5. The industrial multi-functional microchannel reactor production system of claim 4, wherein: the feeding pump (21) is a pulse-free three-pump head diaphragm metering pump.
6. The industrial multi-functional microchannel reactor production system of claim 1, wherein: the heat exchange system (3) comprises three identical heat exchange devices, each heat exchange device comprises a heat conduction oil storage tank (31), an oil inlet pump (32), a check valve (33), an electromagnetic flow regulating valve (34), a pressure transmitter (35), a spiral wound tubular heat exchanger (36), a temperature sensor and a pipeline (37), the heat conduction oil storage tank (31) is connected with the spiral wound tubular heat exchanger (36) through the pipeline (37), the oil inlet pump (31), the pressure transmitter (32), the check valve (33) and the electromagnetic flow regulating valve (34) are sequentially arranged on the pipeline (37), the outlet of the spiral wound tubular heat exchanger (36) is provided with the temperature sensor, and heat exchange pipelines of the three heat exchange devices of the heat exchange system (3) are connected with heat exchange channels on the skid-mounted microchannel reactor unit (1).
7. The industrial multi-functional microchannel reactor production system of claim 1, wherein: the reactor unit micro-control system (41) is arranged on the site of the skid-mounted microchannel reactor unit (1), and each skid-mounted microchannel reactor unit (1) and the feeding system (2) connected with the skid-mounted microchannel reactor unit are provided with an independent reactor micro-control system (41).
8. The industrial multi-functional microchannel reactor production system of claim 1 or 6, wherein: the heat exchange system control system (42) is a control system arranged on the site of the heat exchange devices, and each heat exchange device is provided with one control system.
9. The industrial multi-functional microchannel reactor production system of claim 1, wherein: the centralized control system (43) comprises a central control computer, and the central control computer is connected with all the reactor unit micro-control systems (41) and all the heat exchange system control systems (42).
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