CN114130328A - Photo-thermal synergistic continuous phase catalytic system - Google Patents
Photo-thermal synergistic continuous phase catalytic system Download PDFInfo
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- 230000003197 catalytic effect Effects 0.000 title claims abstract description 23
- 230000002195 synergetic effect Effects 0.000 title claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims abstract description 60
- 239000007788 liquid Substances 0.000 claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 229910052724 xenon Inorganic materials 0.000 claims abstract description 6
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000005286 illumination Methods 0.000 claims abstract description 5
- 239000003054 catalyst Substances 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims description 30
- 239000011941 photocatalyst Substances 0.000 claims description 25
- 239000000047 product Substances 0.000 claims description 24
- 239000007795 chemical reaction product Substances 0.000 claims description 20
- 238000006555 catalytic reaction Methods 0.000 claims description 16
- 239000012263 liquid product Substances 0.000 claims description 5
- 239000000376 reactant Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 74
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- 230000000694 effects Effects 0.000 abstract description 3
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- 238000005070 sampling Methods 0.000 abstract description 2
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- 230000001699 photocatalysis Effects 0.000 abstract 1
- 238000007146 photocatalysis Methods 0.000 abstract 1
- 238000002474 experimental method Methods 0.000 description 11
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- 238000009834 vaporization Methods 0.000 description 9
- 230000002035 prolonged effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000012159 carrier gas Substances 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
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- 239000003344 environmental pollutant Substances 0.000 description 1
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- 239000011344 liquid material Substances 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
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- 238000013032 photocatalytic reaction Methods 0.000 description 1
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Abstract
The application relates to a photo-thermal synergetic continuous phase catalytic system, which relates to the field of photocatalysis and comprises a feeding system, a preheating system, a reaction system, a circulating system, a vacuum system, a product treatment system and a detection system; the feeding system comprises a pressure reducing valve for controlling gas pressure, a gas mass flow controller for controlling gas flow and a metering pump for controlling liquid pressure and flow; the reaction system comprises a reactor for filling a catalyst, a heating device for heating the reactor and a xenon lamp light source for providing illumination; the circulation system comprises a circulation pump for providing power; the vacuum system comprises a power source vacuum pump; the product treatment system comprises a condenser for condensation, a gas-liquid separator for gas-liquid separation and a back pressure valve for controlling the pressure of the reaction gas; the detection system includes a six-way valve for sampling. The method has the effect of improving the accuracy of the reaction rate.
Description
Technical Field
The application relates to the field of photo-thermal catalysis, in particular to a photo-thermal synergetic continuous phase catalytic system.
Background
The principle of photo-thermal catalysis is that a photocatalyst has oxidation-reduction capability under the conditions of illumination and heating, so that the purposes of purifying pollutants, synthesizing substances, converting substances and the like can be achieved.
At present, the common photo-thermal catalytic reaction generally adopts a closed-phase reaction, namely, various solid, liquid and gaseous raw materials are put into a reaction kettle, and the reaction is promoted by conditions such as temperature rise, pressure and light irradiation. After reacting for a period of time, detecting the concentration of the gas generated by the reaction by adopting a needle inserting and sampling mode, thereby obtaining the average reaction rate of the photo-thermal catalytic reaction.
In view of the related art in the above, the inventors considered that the photothermal catalytic reaction is carried out by the reaction tank, and the photothermal catalytic reaction has already started before the inside of the reaction tank reaches the set temperature. The raw materials are consumed in the process of reaching the set temperature, products are generated, the concentration proportion in the reaction kettle is continuously changed, and the change is nonlinear change and cannot be measured. The reaction product produced before reaching the set temperature also has an adverse effect on the reaction after reaching the set temperature. And finally, the reaction rate calculated after the product concentration is measured is an average rate, rather than the actual rate of the photothermal catalytic reaction under the set temperature and the set pressure, so that the accuracy of the reaction rate is influenced.
Disclosure of Invention
In order to improve the accuracy of the reaction rate, the application provides a photo-thermal synergistic continuous phase catalytic system.
The photo-thermal synergetic continuous phase catalysis system adopts the following technical scheme:
the photo-thermal synergetic continuous phase catalytic system comprises a feeding system for controlling feeding of reaction raw materials, a preheating system for preheating the reaction raw materials, a reaction system for carrying out photo-thermal catalytic reaction and a product treatment system for treating reaction products; the feeding system comprises a pressure reducing valve for controlling gas pressure, a gas mass flow controller for controlling gas flow and a metering pump for controlling liquid pressure and flow; the reaction system comprises a reactor for filling a catalyst, a heating device for heating the reactor and a xenon lamp light source for providing illumination; the product processing system includes a back pressure valve for controlling the pressure of the reactant gas.
By adopting the technical scheme, firstly, the temperature of the preheating system and the temperature of the heating furnace are set, and the temperature of the reactor is raised to the experimental temperature; adjusting the inert gas pressure reducing valve to a specified pressure to charge the experiment pipeline; and adjusting the back pressure valve to a specified pressure, so that the air path flows, and the system pressure is maintained at a set pressure. And adjusting the raw material gas pressure reducing valve to a specified pressure, setting the experimental flow, and continuously feeding by the feeding system and continuously discharging by the product treatment system at the moment. At the moment, the temperature, the flow and the pressure all reach experimental conditions, and then the concentration of the reaction product in the exhaust gas is detected through a product detection system. Before the reactor reaches the experimental conditions, the reaction raw materials and the reaction products are all discharged through the product treatment system, so that the influence of the reaction before reaching the set temperature on the reaction reaching the set temperature is avoided, the experimental precision is improved, and the accuracy of the reaction rate is improved.
Optionally, the photo-thermal collaborative continuous phase catalysis system further comprises a circulation system, the circulation system comprises a first three-way valve and a second three-way valve which are arranged on pipelines at two ends of the reactor, the first three-way valve is connected with a circulation pump through a pipeline, and the circulation pump is further connected with the second three-way valve through a pipeline.
Through adopting above-mentioned technical scheme, the staff switches the second three-way valve, makes reaction gas get into circulation system, switches first three-way valve again after a period of time, makes the reactor both ends all communicate in circulation system, drives reaction gas circulation through the circulating pump and flows, makes reaction gas repeatedly get into the reactor and the contact of photocatalyst gives off the photothermal reaction, has prolonged reaction gas and photocatalyst's contact time, has improved the concentration of reaction product, and the staff of being convenient for detects reaction product.
Optionally, the circulation system further comprises a gas storage tank, and the gas storage tank is connected with the circulation pump in series.
Through adopting above-mentioned technical scheme, increased the gaseous quantity of gas that gets into circulation system through the gas holder, prolonged the cycle of gas cycle a week, the accurate control reaction of the staff of being convenient for goes on, has improved the precision of experiment.
Optionally, the photothermal synergistic continuous phase catalysis system further comprises a detection system, the detection system comprises a second four-way valve connected with the circulating pump in series, the second four-way valve is connected with a six-way valve, a quantitative ring is arranged in the six-way valve, and two ends of the quantitative ring are communicated with the circulating pipeline in a switching manner through the six-way valve and the second four-way valve.
Through adopting above-mentioned technical scheme, the staff of being convenient for detects the concentration of reaction product in the circulation system in real time, and the staff detects once through every cycle period of reaction gas, and the change of accurate record light and heat reaction product concentration has improved the accuracy of experimental result.
Optionally, the photothermal synergistic continuous phase catalytic system further comprises a vacuum system, wherein the vacuum system comprises a vacuum pump communicated with the circulation pipeline through a bypass.
Through adopting above-mentioned technical scheme, use the vacuum pump with the pipeline evacuation to the assigned pressure of gas circulation, remaining impurity causes the influence to the reaction in the pipeline before reducing the experiment, has improved the experiment precision.
Optionally, the pipeline and the device for the gas to flow circularly in the circulating system are provided with heat tracing bands.
By adopting the technical scheme, the gas in the circulating pipeline is kept at a constant temperature, the possibility of liquefying the gas is reduced, and the stability of the circulating reaction is improved.
Optionally, the reactor is a tubular reactor, and the photocatalyst is filled in the middle of the tubular reactor.
By adopting the technical scheme, the reaction gas passing through the reactor needs to pass through the photocatalyst, so that the reaction gas is fully contacted with the photocatalyst, and the photo-thermal catalytic reaction is favorably carried out.
Optionally, the heating device is a two-stage heating furnace or a three-stage heating furnace, and the heating device is arranged in the middle of the reactor.
Through adopting above-mentioned technical scheme, the temperature through setting for heating device forms a constant temperature section in the reactor, and the photocatalyst sets up in the middle part position of constant temperature section, and the required constant temperature of simulation experiment of being convenient for is favorable to improving the accuracy of experimental result.
Optionally, the product processing system further comprises a gas-liquid separator for separating a liquid product and a gaseous product.
By adopting the technical scheme, the liquid product and the gas product can be conveniently collected or detected by the staff respectively.
Optionally, a heat tracing band is arranged on a pipeline between the preheating system and the reactor.
Through adopting above-mentioned technical scheme, when making reaction gas pass through the pipeline between preheating system and the reactor, keep invariable temperature, reduced reaction gas liquefaction's possibility, improved light and heat catalytic reaction's stability.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the influence of the reaction before the set temperature is reached on the reaction reaching the set temperature is avoided, and the experimental precision is improved, so that the accuracy of the reaction rate is improved;
2. the contact time of the reaction gas and the photocatalyst is prolonged, the concentration of the reaction product is improved, and the detection of the reaction product by workers is facilitated;
3. the change of the concentration of the product of the photothermal reaction is accurately recorded, and the accuracy of the reaction rate detection result is improved.
Drawings
FIG. 1 is a schematic diagram of a photothermal co-continuous phase catalytic system according to an embodiment of the present application.
Fig. 2 is an enlarged schematic view of a portion a in fig. 1.
Fig. 3 is an enlarged schematic view of a portion B in fig. 1.
Description of reference numerals: 1. a feed system; 11. a gas feed branch; 111. a stop valve; 112. a first filter; 113. a pressure reducing valve; 114. a gas mass flow controller; 115. a first check valve; 116. a first pressure gauge; 117. a first four-way valve; 118. a bubbler; 12. a liquid feed branch; 121. a liquid feedstock tank; 122. a second filter; 123. a metering pump; 124. a second pressure gauge; 125. a second one-way valve; 2. a preheating system; 21. a vaporizing mixer; 22. preheating a furnace; 3. a reaction system; 31. a reactor; 32. a heating device; 33. a xenon light source; 4. a product treatment system; 41. a condenser; 42. a gas-liquid separator; 43. a first needle valve; 44. a third filter; 45. a back pressure valve; 46. a second needle valve; 47. a third needle valve; 5. a circulation system; 51. a gas storage tank; 52. a circulation pump; 53. a first three-way valve; 54. a second three-way valve; 6. a detection system; 61. a second four-way valve; 62. a six-way valve; 620. a dosing ring; 7. a vacuum system; 71. a third three-way valve; 72. a vacuum pump.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
The embodiment of the application discloses photo-thermal synergetic continuous phase catalytic system. Referring to fig. 1, a photothermal synergistic continuous phase catalytic system includes a feed system 1, a preheating system 2, a reaction system 3, and a product treatment system 4. The feeding system 1 is used for controlling the feeding of the reaction raw materials and conveying the reaction raw materials to the preheating system 2. The reaction raw materials enter the reaction system 3 after being preheated in the preheating system 2, are heated to a set temperature and are contacted with the photocatalyst for reaction. The reaction gas is vented from the reaction system 3 and vented or monitored by the product handling system 4.
Referring to fig. 1 and 2, the feeding system 1 includes a plurality of gas feeding branches 11, and the plurality of gas feeding branches 11 are identical in structure. The gas feed branch 11 is connected in series in sequence with a shutoff valve 111, a first filter 112, a pressure reducing valve 113, a gas mass flow controller 114, and a first check valve 115 through a pipe. The shutoff valve 111 is used to connect a gas material tank and control the introduction of gas material. The first filter 112 is used to filter the gas feed. The pressure reducing valve 113 is used to reduce the pressure of the high-pressure gas output from the gas material tank to a predetermined pressure, and to maintain the pressure in the line after the pressure reducing valve 113 constant. A first pressure gauge 116 for detecting the gas pressure is provided on the pipe on both sides of the pressure reducing valve 113. The gas mass flow controller 114 is used to control the flow of gas. After the set flow rate is input, the gas mass flow controller 114 automatically adjusts the flow rate of the gas according to the pressure difference between the front and the rear, so that the gas reaches the set flow rate. The first check valve 115 serves to prevent gas from flowing backward. Through the cooperation of the pressure reducing valve 113 and the gas mass flow controller 114, the gas raw materials enter the preheating system 2 at constant pressure and constant flow, so that the staff can accurately control the gas feeding dosage and the system pressure, and the accuracy of the experimental result can be improved.
In the present embodiment, the gas feeding branch 11 is provided with three branches, i.e., a CO2 feeding branch, an H2 feeding branch and an N2 feeding branch. CO2 is discharged from a CO2 raw material tank and then passes through a CO2 feeding branch to obtain CO2 gas with constant pressure and constant current, H2 is discharged from an H2 raw material tank and then passes through an H2 feeding branch to obtain H2 gas with constant pressure and constant current, and N2 is discharged from an N2 raw material tank and then passes through an N2 feeding branch to obtain N2 gas with constant pressure and constant current.
The gas mass flow controller 114 of each gas feed branch 11 is provided with a bypass for gas path purging, leak detection and pressure build-up.
The gas path feeding branch 11 may be connected with a bubbler 118, and in the present embodiment, the N2 feeding branch is connected with the bubbler 118. The bubbler 118 is connected between the first check valve 115 and the preheating system 2, and the gas feeding branch 11 is connected to a first four-way valve 117, and the bubbler 118 is connected through the first four-way valve 117. The first four-way valve 117 is switched to select whether to pass the N2 gas through the bubbler 118, carrying the volatile material in the bubbler 118 into the preheat system 2. In order to prevent the volatile substances in the piping from being liquefied, a heat tracing band is provided on the piping between the bubbler 118 and the preheating system 2, and a thermometer for detecting the temperature of the gas is installed on the piping.
Referring to fig. 1 and 2, the feeding system 1 further includes a liquid feeding branch 12, and the liquid feeding branch 12 includes a liquid raw material tank 121 for storing the liquid raw material, a second filter 122 for filtering the liquid raw material, a metering pump 123 for controlling a flow rate of the liquid raw material, a second pressure gauge 124 for measuring a pressure of the liquid raw material, and a second check valve 125 for preventing a backflow of the liquid raw material. The liquid material tank 121, the second filter 122, the metering pump 123, the second pressure gauge 124 and the second check valve 125 are connected in series in sequence through a pipeline. After the staff inputs the set flow on the metering pump 123, the metering pump 123 automatically controls the flow and the pressure of the liquid raw material, so that the liquid raw material enters the preheating system 2 at constant pressure and constant flow, the staff can conveniently and accurately control the liquid feeding dosage and the system pressure, and the accuracy of the experimental result is improved.
Referring to fig. 1 and 2, the preheating system 2 includes a vaporization mixer 21, and the gas feeding branch 11 and the liquid feeding branch 12 are connected to the vaporization mixer 21. A preheating furnace 22 for heating the vaporization mixer 21 is provided outside the vaporization mixer 21. The liquid raw material is heated and vaporized after entering the vaporization mixer 21, and is mixed with the gas raw material, and the mixed reaction gas enters the reaction system 3 through a pipeline. In order to maintain a constant temperature of the reaction gas while passing through the pipe between the vaporization mixer 21 and the reaction system 3, a heat tracing band and a temperature gauge for detecting the temperature of the reaction gas are provided on the pipe between the vaporization mixer 21 and the reaction system 3.
Referring to fig. 1 and 3, the reaction system 3 includes a reactor 31, and the reactor 31 is a vertically arranged tubular reactor, and a photocatalyst is filled in a middle position of the reactor 31. The upper end of the reactor 31 is communicated with the vaporizing mixer 21, so that the reaction gas is vertically fed and vertically discharged in the reactor 31. The reaction gas passing through the reactor 31 needs to pass through the photocatalyst, so that the reaction gas is fully contacted with the photocatalyst, and the photo-thermal catalytic reaction is facilitated.
A heating device 32 for heating the reactor 31 is provided outside the reactor 31, and the heating device 32 is a two-stage heating furnace, but may be a three-stage heating furnace in other embodiments. The heating device 32 is disposed at the middle position of the reactor 31, the xenon lamp light source 33 is disposed at the middle position of the heating device 32, and the xenon lamp light source 33 irradiates the photocatalyst. A type K thermocouple for measuring the temperature at the center of the reactor 31 is also provided on the reactor 31. Form a thermostatic section through heating device 32 in reactor 31, and the photocatalyst sets up in the middle part position of thermostatic section, and the required constant temperature of the simulation experiment of being convenient for is favorable to improving the accuracy of experimental result.
Referring to fig. 1 and 3, the product treatment system 4 includes a condenser 41, one end of the condenser 41 is connected to the reactor 31 through a pipe, and the other end of the condenser 41 is connected to a gas-liquid separator 42 through a pipe. The condenser 41 liquefies the easily liquefiable gas in the reaction gas, and performs gas-liquid separation in the gas-liquid separator 42. The bottom end of the gas-liquid separator 42 is connected with a first needle valve 43 through a pipeline, the liquid product is deposited at the bottom of the gas-liquid separator 42, and the liquid product can be emptied or detected through the first needle valve 43. The top of the gas-liquid separator 42 is connected in series with a third filter 44, a back pressure valve 45 and a second needle valve 46 in sequence through pipes, and the second needle valve 46 is used for connecting with a chromatograph. A third needle valve 47 is also connected in parallel between the back pressure valve 45 and the second needle valve 46. The gas exiting the gas-liquid separator 42, after passing through the back pressure valve 45, may be selectively directed to the chromatograph via a second needle valve 46 or vented via a third needle valve 47.
The back pressure valve 45 is used to keep the pressure in front of the back pressure valve 45 constant. Through the mutual cooperation of the reducing valve 113, the metering pump 123 and the back pressure valve 45, stable pressure is kept in the reactor 31, a constant pressure environment required by an experiment is convenient to simulate, and the accuracy of an experiment result is improved.
Referring to fig. 1 and 3, since the photocatalytic reaction is slow, the contact time of the reaction gas passing through the reactor 31 with the photocatalyst is short, the concentration of the product generated by the reaction is low, and it is sometimes difficult to detect it. In order to prolong the contact time of the reaction gas and the photocatalyst, a circulation system 5 is provided beside the reactor 31 for facilitating the reaction gas to repeatedly enter the reactor 31. The circulation system 5 includes an air tank 51 and a circulation pump 52. The gas tank 51 is used for increasing the gas amount of the circulating reaction gas, and the gas amount can be controlled by installing the gas tanks 51 with different volumes; the circulating pump 52 is used for providing power for the gas circulation flow. A first three-way valve 53 is provided on the pipe between the reactor 31 and the vaporization mixer 21, and a second three-way valve 54 is provided on the pipe between the reactor 31 and the condenser 41. The second three-way valve 54 is connected to the air tank 51 through a pipe, the air tank 51 is connected to the circulation pump 52 through a pipe, and the circulation pump 52 is connected to the first three-way valve 53 through a pipe. The reactor 31 can be communicated with the circulation system 5 by switching the first three-way valve 53 and the second three-way valve 54.
The worker makes the reaction gas enter the gas container 51 by switching the second three-way valve 54. After a lapse of time, the first three-way valve 53 is switched to communicate the circulation pump 52 with the reactor 31. Then, the circulation pump 52 is started, and the circulation pump 52 drives the gas in the gas storage tank 51 and the pipeline to enter the reactor 31 from the first three-way valve 53 to start circulating flow. The circularly flowing reaction gas repeatedly enters the reactor 31 to contact with the photocatalyst for reaction, so that the contact time of the reaction gas and the photocatalyst is prolonged, the concentration of a reaction product is improved, and the concentration of the product can be accurately detected.
Meanwhile, if the packing height of the photocatalyst in the reactor 31 is a, the second cycle in which the reaction gas in the reactor 31 circulates through the circulation system 5 corresponds to: the reaction gas catalyzed by the photocatalyst with the height of a in the reactor 31 is catalyzed again by the photocatalyst with the height of a. The two cycles, i.e. under the same temperature and illumination intensity conditions of the reactor 31, can be considered as the raw material passing through the catalyst at the height of 2a, thus facilitating the calculation of the reaction rate. The circulating system 5 can accurately calculate the reaction rate under different circulating times on the premise of ensuring that the product concentration can be accurately detected.
In order to facilitate the detection of the concentration of the reaction product in the cyclic reaction, the circulating system 5 is connected with a detection system 6, and the detection system 6 comprises a second four-way valve 61. The second four-way valve 61 is disposed on a pipeline between the air tank 51 and the second three-way valve 54, a six-way valve 62 is connected through the second four-way valve 61, and a fixed amount ring 620 is disposed in the six-way valve 62. Two ends of the quantitative ring 620 are communicated with a pipeline for circulating the reaction gas by switching the second four-way valve 61 and the six-way valve 62; or the six-way valve 62 is switched to connect both ends of the quantitative ring 620 to the carrier gas device and the chromatograph, respectively. The reaction gas discharged from the reactor 31 passes through the second three-way valve 54 and the second four-way valve 61, enters the quantitative ring 620 of the six-way valve 62, is discharged from the quantitative ring 620, and enters the gas holder 51. When the staff needs to detect the concentration of the reaction product in the cyclic reaction, the six-way valve 62 is rotated, so that the two ends of the quantitative ring 620 are respectively connected to the carrier gas device and the chromatograph, and the quantitative reaction gas sample in the quantitative ring 620 is detected.
In order to maintain a constant temperature of the gas in the circulation line, heat tracing bands are provided on both the line and the device through which the reaction gas circulates, and a thermometer is installed on the line on which the heat tracing bands are provided. The heat tracing band is arranged on the pipeline and the device for the circular flow of the reaction gas, so that the possibility of gas liquefaction is reduced, and the stability of the circular reaction is improved.
In order to increase the purity of the reaction product. The circulation system 5 is further connected to a vacuum system 7, the vacuum system 7 comprising a third three-way valve 71. The third three-way valve 71 is disposed on a pipeline between the second four-way valve 61 and the six-way valve 62, and is connected to a vacuum pump 72 through the third three-way valve 71. Before reaction raw materials enter the photo-thermal synergetic continuous phase catalytic system, a pipeline for gas circulation is vacuumized to a specified pressure by using a vacuum pump 72, and the influence of residual substances in the pipeline on the reaction before the experiment is reduced, so that the experiment precision is improved.
The principle of the photo-thermal synergetic continuous phase catalytic system of the embodiment of the application is as follows: after the vacuum is drawn by the vacuum pump 72, the temperature of the preheating furnace 22, the temperature of the heat tracing band, and the temperature of the heating device 32 are set. And after the temperature of the system reaches the set temperature, opening the inert gas stop valve 111, adjusting the pressure reducing valve 113 to the specified pressure, and adjusting the gas mass flow controller 114 to the specified flow, so that the experiment pipeline is inflated. The back pressure valve 45 is then adjusted to allow the gas path to flow and maintain the system pressure at the set pressure. Then, the raw material gas stop valve 111 is opened, the pressure reducing valve 113 is adjusted to a specified pressure, the metering pump 123 is opened, the liquid raw material enters the vaporization mixer 21 to be vaporized and then mixed with the gas raw material, and the feeding system 1 continuously feeds and the product processing system 4 continuously discharges. At this point the temperature, flow rate, pressure all reached the experimental conditions and the concentration of the reaction product was then detected by the product treatment system 4. Through the operation, the influence of the reaction before reaching the set temperature on the reaction reaching the set temperature is avoided, and the experiment precision is improved, so that the experiment accuracy is improved.
After the initial data is detected, the second three-way valve 54 is switched to allow the reaction gas passing through the reactor 31 to enter the circulation system 5, after a set time, a fixed amount of the reaction gas enters the circulation system 5, the first three-way valve 53 is switched to start the circulation pump 52, and the reaction gas repeatedly enters the reactor 31 to contact with the photocatalyst to perform the photothermal catalytic reaction. The reactor 31 is communicated with the circulating system 5, so that the reaction gas repeatedly contacts with the photocatalyst, the contact time of the reaction gas and the photocatalyst is prolonged, the concentration of a reaction product is improved, and the detection of the reaction product is facilitated; the circulation period of the reaction gas is controlled by setting the volume of the gas tank 51 and the flow rate of the circulation pump 52, thereby facilitating the control of the number of times of the reaction gas circulation by the worker; the concentration of the reaction product is detected at regular time through the six-way valve 62, so that the change condition of the concentration of the reaction product in different periods can be calculated by workers conveniently, and a more accurate experimental result can be obtained. Compare in correlation technique, the photo-thermal cooperation continuous phase catalytic system of this application has improved reaction rate's accuracy.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. Photo-thermal synergetic continuous phase catalytic system, which is characterized in that: comprises a feeding system (1) for controlling the feeding of reaction raw materials, a preheating system (2) for preheating the reaction raw materials, a reaction system (3) for carrying out photo-thermal catalytic reaction and a product treatment system (4) for treating reaction products; the feed system (1) comprises a pressure reducing valve (113) for controlling the pressure of the gas, a gas mass flow controller (114) for controlling the flow of the gas and a metering pump (123) for controlling the pressure and flow of the liquid; the reaction system (3) comprises a reactor (31) for filling a catalyst, a heating device (32) for heating the reactor (31) and a xenon lamp light source (33) for providing illumination; the product processing system (4) includes a back pressure valve (45) for controlling the pressure of the reactant gas.
2. The photothermal synergistic continuous phase catalytic system of claim 1, wherein: still include circulation system (5), circulation system (5) including set up in first three-way valve (53) and second three-way valve (54) on reactor (31) both ends pipeline, first three-way valve (53) have a circulating pump (52) through the pipe connection, circulating pump (52) still pass through pipe connection in second three-way valve (54).
3. The photothermal synergistic continuous phase catalytic system of claim 2, wherein: the circulating system (5) further comprises an air storage tank (51), and the air storage tank (51) is connected with the circulating pump (52) in series.
4. The photothermal synergistic continuous phase catalytic system of claim 2, wherein: the device is characterized by further comprising a detection system (6), wherein the detection system (6) comprises a second four-way valve (61) connected with the circulating pump (52) in series, the circulating system (5) is connected with a six-way valve (62) through the second four-way valve (61), a quantitative ring (620) is arranged in the six-way valve (62), and two ends of the quantitative ring (620) are communicated with the circulating pipeline in a switching mode through the six-way valve (62) and the second four-way valve (61).
5. The photothermal synergistic continuous phase catalytic system of claim 2, wherein: the vacuum system (7) is further provided, and the vacuum system (7) comprises a vacuum pump (72) communicated with the circulating pipeline in a bypass mode.
6. The photothermal synergistic continuous phase catalytic system of claim 2, wherein: and heat tracing bands are arranged on pipelines and devices for the gas to flow circularly in the circulating system (5).
7. The photothermal synergistic continuous phase catalytic system of claim 1, wherein: the reactor (31) is a tubular reactor, and the photocatalyst is filled in the middle position of the tubular reactor.
8. The photothermal synergistic continuous phase catalytic system of claim 7, wherein: the heating device (32) is a two-section heating furnace or a three-section heating furnace, and the heating device (32) is arranged in the middle of the reactor (31).
9. The photothermal synergistic continuous phase catalytic system of claim 1, wherein: the product processing system (4) further comprises a gas-liquid separator (42) for separating a liquid product and a gaseous product.
10. The photothermal synergistic continuous phase catalytic system of claim 1, wherein: and a heat tracing band is arranged on a pipeline between the preheating system (2) and the reactor (31).
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