Method for determining the separation performance of porous membranes for light gas separation

Abstract

A method for determining the light gas separation performance of a porous membrane is provided. The separation performance determination system includes a separator assembly and a detection component. The separator assembly includes multiple separators, each containing a porous membrane. The multiple separators include intermediate separators and edge separators. One edge separator forms a light distillate gas outlet, and another edge separator forms a heavy distillate gas outlet. The detection component is connected to the separator assembly. The method for determining the light gas separation performance of the porous membrane includes: separating light gas using the separators to obtain light distillate gas and heavy distillate gas, wherein the average mass number of the light distillate gas is less than the average mass number of the heavy distillate gas; internally circulating the light distillate gas and heavy distillate gas within the separation performance determination system to achieve multiple separations within the system; and obtaining the separation performance of the porous membrane for light gas through the detection component after a preset time.

Description

Technical Field

[0001] This application relates to the field of separation technology, and in particular to a method for measuring the light gas separation performance of a porous membrane in a system for measuring separation performance. Background Technology

[0002] Porous membranes, as functional materials with unique structures, have wide applications in various fields such as gas separation, water treatment, biomedicine, and battery manufacturing due to their excellent separation selectivity and good chemical stability. In the field of gas separation, porous membranes can achieve gas separation or gas capture processes based on the differences in the size or adsorption properties of different gas molecules.

[0003] The separation performance of porous membranes is a core key indicator determining their application effectiveness and applicable scenarios. Accurate and efficient measurement of this performance is the prerequisite and foundation for porous membrane research and development and industrial application selection. Currently, there are still shortcomings in measuring the separation performance of porous membranes for light gases of different mass numbers. A mature laboratory-level validation scheme is lacking, leading to problems such as unstable separation effects and difficulties in parameter optimization during large-scale industrial applications.

[0004] In view of this, there is an urgent need to provide a method for determining the light gas separation performance of a porous membrane in order to determine the separation performance of the porous membrane for light gases. Summary of the Invention

[0005] This application is made in view of the aforementioned state of the prior art. This application provides a method for determining the light gas separation performance of a porous membrane using a separation performance determination system.

[0006] A method for determining the light gas separation performance of a porous membrane is provided. The separation performance determination system includes a separator assembly and a detection component. The separator assembly includes multiple separators, each containing a porous membrane. The multiple separators include intermediate separators and edge separators. One edge separator forms a light distillate gas outlet, and another edge separator forms a heavy distillate gas outlet. The detection component is connected to the separator assembly. The method for determining the light gas separation performance of the porous membrane includes: separating the light gas using the separators to obtain light distillate gas and heavy distillate gas, wherein the average mass number of the light distillate gas is less than the average mass number of the heavy distillate gas; internally circulating the light distillate gas and the heavy distillate gas within the separation performance determination system to achieve multiple separations within the system; and obtaining the separation performance of the porous membrane for the light gas through the detection component after a preset time.

[0007] Optionally, the internal circulation of the light distillate gas and the heavy distillate gas within the separation performance measurement system includes: allowing the light distillate gas separated by one of the separators adjacent to the intermediate separator to flow into the intermediate separator, and allowing the heavy distillate gas separated by another separator adjacent to the intermediate separator to flow into the intermediate separator; allowing the heavy distillate gas separated by the edge separator on the heavy distillate gas outlet side to flow into the edge separator on the heavy distillate gas outlet side; and allowing the light distillate gas separated by the edge separator on the light distillate gas outlet side to flow into the edge separator on the light distillate gas outlet side.

[0008] Optionally, the method for determining the light gas separation performance of a porous membrane includes: pre-treating the system for determining the separation performance before using a separator to separate the light gas.

[0009] Optionally, the pretreatment of the separation performance measurement system includes: evacuating the separation performance measurement system to achieve a preset vacuum level.

[0010] Optionally, the preprocessing of the separation performance measurement system includes: adjusting the pressure ratio of the gas before and after passing through the separator to a preset pressure ratio, wherein the preset pressure ratio is greater than or equal to 4.

[0011] Optionally, obtaining the separation performance of the porous membrane for the light gas by means of the detection component includes: taking samples at different locations within the separation performance measurement system to obtain sample data; obtaining the abundance of different components of the gas within the separation performance measurement system based on the sample data; and calculating the separation performance of the porous membrane for the light gas based on the abundance.

[0012] Optionally, obtaining the abundance of different components of the gas in the separation performance measurement system based on the sample data includes performing abundance analysis or mass spectrometry analysis on the sample data.

[0013] Optionally, the separator assembly has a feed end, and an intermediate separator input of the intermediate separator constitutes the feed end.

[0014] Optionally, the separator is provided with multiple porous membranes connected in parallel.

[0015] Optionally, the pore size of the porous membrane is less than 100 nm.

[0016] The method for determining the light gas separation performance of a porous membrane using the separation performance determination system provided above, in this embodiment of the application, involves separating the light gas using a separator to obtain light distillate gas and heavy distillate gas. The light distillate gas and the heavy distillate gas are internally circulated within the separation performance determination system, and after a preset time, the separation performance of the porous membrane for the light gas is obtained through a detection component, thereby determining the separation performance of the porous membrane for the light gas. Attached Figure Description

[0017] Figure 1 An exemplary block diagram is shown of a method for measuring the light gas separation performance of a porous membrane according to one embodiment of the present application.

[0018] Figure 2 An exemplary structural diagram of a separation performance measurement system according to one embodiment of this application is shown.

[0019] Figure 3 An exemplary structural diagram of a porous membrane for a separation performance measurement system according to one embodiment of this application is shown.

[0020] Figure 4 An exemplary block diagram of a separation performance measurement system according to another embodiment of this application is shown.

[0021] Figure 5 An exemplary block diagram of a system for measuring separation performance according to yet another embodiment of this application is shown.

[0022] Figure 6 An exemplary block diagram is shown of a method for obtaining the separation performance of a porous membrane for light gases by means of a detection component according to one embodiment of this application.

[0023] Explanation of reference numerals in the attached figures

[0024] 10 Intermediate Separator

[0025] 104 porous membrane

[0026] 105 Feed end

[0027] 106 gas cylinders

[0028] 107 Buffer Tank

[0029] 11. Intermediate Separator Input Terminal

[0030] 12. Light Distillation End of Intermediate Separator

[0031] 13. Reboiler end of intermediate separator

[0032] 20 Edge Separator

[0033] 21 Edge splitter input terminal

[0034] 22 Edge Separator Light Distillation End

[0035] 23 Edge separator recrystallization end

[0036] 30 samplers

[0037] 40 Compressor

[0038] 50 Flow Meter

[0039] 60 pressure gauge

[0040] 70 Vacuum Pump

[0041] 80 Shut-off Valve

[0042] 90 Pressure regulating valve Detailed Implementation

[0043] Exemplary embodiments of this application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement this application only, and are not intended to exhaustively describe all possible methods of this application, nor to limit the scope of this application.

[0044] The embodiments of this application provide a method for measuring the light gas separation performance of a porous membrane using a separation performance measurement system.

[0045] It is important to understand that the light gas can be a mixture of gases with different mass numbers, which can vary significantly or very slightly (for example, the light gas can be a mixture of gases with mass numbers of 44 and 45). Furthermore, the mass number of the light gas (which can be the mass number of the mixture of different gases within the light gas) can be relatively small, for example, less than 80. It is also important to understand that the light gas can be a mixture of multiple different gases (e.g., two, three, or four gases).

[0046] It should be understood that the scheme of this application can not only measure the separation performance of the porous membrane 104 for light gases, but also measure the separation performance of the porous membrane 104 for other mixed gases (e.g., mixed gases with a mass number greater than 80).

[0047] like Figure 2 , Figure 4 as well as Figure 5 As shown, a separation performance measurement system may include a separator assembly and a detection component.

[0048] Separator assemblies can be used to separate light gases, and may include multiple separators (e.g. Figure 2The separator comprises an intermediate separator 10 and an edge separator 20, with a porous membrane 104 disposed within each separator. It is understood that after passing through the porous membrane in the separator, light gas can be separated into light distillate gas and heavy distillate gas. Furthermore, the separator has an input end, a light distillate output end, and a heavy distillate output end. Light gas can enter the separator from the input end, and the light distillate gas obtained after separation by the porous membrane can flow out from the light distillate output end, while the heavy distillate gas obtained after separation can flow out from the heavy distillate output end.

[0049] Specifically, such as Figure 2 As shown, the multiple separators include an intermediate separator 10 and an edge separator 20. It should be understood that the intermediate separator 10 and the edge separator 20 can be the same separator. Furthermore, the separation performance measurement system may include two edge separators 20, wherein one edge separator 20 (e.g., Figure 2 The edge separator 20 located on the right side can form a light distillate gas outlet, and another edge separator 20 (e.g.) Figure 2 The edge separator 20 located on the left side can form a recrystallized gas outlet.

[0050] like Figure 2 , Figure 4 as well as Figure 5 As shown, the input terminal of the intermediate separator 10 is not connected to its own output terminal, while the input terminal of the edge separator 20 can be connected to its own output terminal. For example, the input terminal of the edge separator 20 can be connected to the output terminal (heavy distillation output terminal or light distillation output terminal) of the intermediate separator 10 adjacent to the edge separator 20, as well as the output terminal (heavy distillation output terminal or light distillation output terminal) of the edge separator 20 itself.

[0051] like Figure 3 As shown, a porous membrane 104 is disposed within the separator. It should be understood that the pore size of the porous membrane can be less than 100 nm, and the material of the porous membrane can be, for example, polypropylene. Preferably, the pore size of the porous membrane 104 can be 50 nm. It should be understood that the pore size specified in this application is not... Figure 3 The diameter of the tubular porous membrane shown is not in the radial direction, but rather the characteristic size that allows material to pass through the interior of the porous membrane 104.

[0052] Figure 3 The flow of gas within the porous membrane 104 is illustrated, such as... Figure 3 As shown, the porous membrane 104 can be configured as a tubular shape, allowing gas (e.g., light gas) to enter from one side of the tubular porous membrane 104 in the axial direction (hereinafter referred to as the inlet end of the porous membrane 104). A portion of the light gas can enter from the sidewall of the tubular porous membrane 104 (along...). Figure 3The gas flows out from the radial direction of the porous membrane 104 (hereinafter referred to as the second output end of the porous membrane 104), and some of the gas in the light gas can continue to move along the axial direction and then flow out from the other side of the tubular porous membrane 104 in the axial direction (hereinafter referred to as the first output end of the porous membrane 104).

[0053] It should be understood that, in the above description, when the light gas enters the tubular porous membrane 104, the gas with a smaller mass number passes through the sidewall of the porous membrane 104 at a faster speed, while the gas with a larger mass number passes through the sidewall of the porous membrane 104 at a slower speed. As a result, the proportion of the gas with a smaller mass number in the gas after passing through the membrane is increased. These gases can flow out from the second output end, and the gas flowing out from the second output end can be referred to as light distillate gas.

[0054] Furthermore, the gas that has not passed through the sidewall of the aforementioned porous membrane 104 can continue to move along the axial direction, and thus can flow out from the first output end of the porous membrane 104, wherein the gas flowing out from the first output end of the porous membrane 104 can be referred to as a recalcified gas.

[0055] It is understandable that, among the aforementioned light gases, gases with smaller mass numbers have a higher probability of penetrating the sidewalls of the porous membrane 104, while gases with larger mass numbers have a relatively lower probability of penetrating the porous membrane 104. Therefore, the average mass number of the gas flowing out from the second output end (i.e., light distilled gas) is less than the average mass number of the gas flowing out from the first output end (i.e., heavy distilled gas).

[0056] It is understandable that the term "reproduced gas" does not mean that it only contains gases with large mass numbers. The reproduced gas contains gases with large mass numbers as well as gases with small mass numbers, and the average mass number of these gases is the average mass number of the reproduced gas.

[0057] Similarly, light distillate gas does not mean that it only contains gases with small mass numbers. Light distillate gas contains gases with small mass numbers as well as gases with large mass numbers. The average mass number of these gases is the average mass number of light distillate gas.

[0058] It should be understood that the average mass number of the aforementioned light distillate gases is less than the average mass number of the heavy distillate gases.

[0059] It is understandable that light gas can be separated after flowing through the porous membrane 104.

[0060] In some embodiments, the working split ratio of the separator can be 0.5, that is, the flow rate of light distillate gas output from the light distillate output end is half of the light gas flow rate before entering the splitter (which can be denoted as the first input flow rate). In this case, the flow rate of heavy distillate gas output from the heavy distillate output end can be the same as the flow rate of light distillate gas output from the light distillate output end.

[0061] By setting the working split ratio, when the gas output from the output end of one separator (light distillation output end or heavy distillation output end) and the gas output from the output end of another separator (heavy distillation output end or light distillation output end) are used together as a new input gas, the flow rate of the new input gas (which can be denoted as the second input flow rate) is the same as the first input flow rate mentioned above, thereby avoiding flow imbalance and achieving symmetrical separation.

[0062] Optionally, a plurality of porous membranes 104 may be provided in the separator, and these porous membranes 104 may be connected in parallel. For example, 100-150 tubular porous membranes 104 may be provided in a separator (i.e., an intermediate separator 10 or an edge separator 20), and these tubular porous membranes 104 may be connected in parallel.

[0063] like Figure 1 As shown, the method 100 for determining the light gas separation performance of a porous membrane includes step S110, using a separator to separate light gas to obtain light distillate gas and heavy distillate gas, wherein the average mass number of the light distillate gas is less than the average mass number of the heavy distillate gas.

[0064] like Figure 2 As shown, optionally, the separator assembly has a feed end 105, and the intermediate separator input end of an intermediate separator 10 can constitute the feed end 105. Further, the feed end 105 can be connected to a buffer tank 107 and a gas cylinder 106. Gas (e.g., light gas) from the gas cylinder 106 can enter the buffer tank 107 and then enter the system through the feed end 105. The buffer tank 107 prevents excessively high gas pressure in the gas cylinder 106 from impacting the system.

[0065] It is necessary to understand that Figure 2 The location of the feed end shown is merely an illustrative example and may be located elsewhere in the system.

[0066] It is understandable that after the light gas enters the system through the feed end 105, it can enter the separator through the input end of the separator. After being separated by the separator (separation membrane), the light gas can be divided into light distillate gas and heavy distillate gas.

[0067] The method 100 for determining the light gas separation performance of a porous membrane further includes step S120, in which the light distillate gas and the heavy distillate gas are internally circulated within the system for determining the separation performance, so that the light distillate gas and the heavy distillate gas are separated multiple times within the system for determining the separation performance.

[0068] Optionally, light distilled gas separated by one of the separators adjacent to the intermediate separator 10 can flow into the intermediate separator 10, and heavy distilled gas separated by another separator adjacent to the intermediate separator 10 can flow into the intermediate separator.

[0069] like Figure 2 and Figure 4 As shown, when the intermediate separator 10 is located between an intermediate separator 10 and an edge separator 20, the input terminal of the intermediate separator 10 (e.g., Figure 4 The intermediate separator input terminal 11 shown is connected to the output terminal of the intermediate separator 10 adjacent to the intermediate separator 10 (intermediate separator light distillation end 12 or intermediate separator heavy distillation end 13) and the output terminal of the edge separator 20 adjacent to the intermediate separator 10 (edge ​​separator light distillation end 22 or edge separator heavy distillation end 23).

[0070] like Figure 5 As shown, when the intermediate separator 10 is located between two intermediate separators 10, the intermediate separator input terminal 11 of the intermediate separator 10 located in the middle can be connected to the light distillation terminal 12 of one of the two intermediate separators 10 adjacent to the intermediate separator, and to the heavy distillation terminal 13 of the other intermediate separator 10.

[0071] Furthermore, such as Figure 2 , Figure 4 as well as Figure 5 As shown, the heavy distillate gas separated by the edge separator 20 on the heavy distillate gas outlet side can flow into the edge separator 20 on the heavy distillate gas outlet side. The light distillate gas separated by the edge separator 20 on the light distillate gas outlet side can flow into the edge separator 20 on the light distillate gas outlet side.

[0072] like Figure 4 as well as Figure 5 As shown, the edge separator 20 located on the left can be the edge separator 20 on the retort gas outlet side, and the edge separator retort end 23 of the edge separator 20 can be connected to its own edge separator input end 21.

[0073] like Figure 4 as well as Figure 5 As shown, the edge separator 20 located on the right can be an edge separator 20 on the light distillation gas outlet side, and the edge separator light distillation end 22 of the edge separator 20 can be connected to its own edge separator input end 21.

[0074] It is understandable that, such as Figure 4 as well as Figure 5As shown, the light distilled gas obtained after the edge separator 20 on the light distilled gas outlet side (i.e., the right edge separator of the two edge separators 20) separates the gas can flow out from the light distilled end 22 of the edge separator, and then flow into the edge separator 20 on the light distilled gas outlet side through the edge separator input end 21.

[0075] Similarly, as Figure 4 as well as Figure 5 As shown, the recalcified gas obtained after the edge separator 20 on the recalcified gas outlet side (i.e., the edge separator on the left of the two edge separators 20) separates the gas can flow out from the recalcified end 23 of the edge separator, and then flow into the edge separator 20 on the recalcified gas outlet side through the edge separator input end 21.

[0076] By setting up the intermediate separator 10 and the edge separator 20, the light distillate gas and the heavy distillate gas can be circulated within the system, thereby allowing the light distillate gas and the heavy distillate gas to be separated multiple times within the system for measuring separation performance. This also allows the components with larger mass fractions in the gas to be enriched on the heavy distillate side, while the components with smaller mass fractions in the gas are enriched on the light distillate side.

[0077] It should be understood that the multiple separations of light and heavy distillate gases within the separation performance measurement system mentioned in this application can include: after the light and heavy distillate gases are separated by a separator within the separation performance measurement system, light distillate gas (which can be denoted as the first light distillate gas) and heavy distillate gas (which can be denoted as the first heavy distillate gas) can be obtained. The aforementioned light distillate gas (i.e., the first light distillate gas) and heavy distillate gas (i.e., the first heavy distillate gas) can be separated again by a separator within the separation performance measurement system to obtain light distillate gas (which can be denoted as the second light distillate gas) and heavy distillate gas (which can be denoted as the second heavy distillate gas). Furthermore, the aforementioned second light distillate gas and second heavy distillate gas can continue to be separated (multiple times), which will not be elaborated upon here.

[0078] The method 100 for determining the light gas separation performance of a porous membrane further includes step S130, in which the separation performance of the porous membrane for light gas is obtained by a detection component after a preset time.

[0079] Optionally, such as Figure 6 As shown, obtaining the separation performance of the porous membrane for light gases through the detection component may include step S131, which involves taking samples at different locations within the separation performance measurement system to obtain sample data. Specifically, as... Figure 2 As shown, the detection component may include a sampler 30. The sampler 30 can take samples at different locations within the system; for example, the sampler 30 can be connected to the light distillation output of the separator (e.g., ...). Figure 2 As shown), the retort output terminal (such as...) Figure 2By connecting to the input of a separator (as shown in the image) or other devices, sample data from different locations can be obtained.

[0080] Obtaining the separation performance of the porous membrane for light gases through the detection component may further include step S132, which involves obtaining the abundance of different components of the gas within the separation performance determination system based on sample data. Specifically, abundance analysis or mass spectrometry analysis can be performed on the aforementioned sample data to obtain the abundance of different components of the gas within the separation performance determination system.

[0081] The method of obtaining the separation performance of the porous membrane for light gases through the detection component may further include step S133, which calculates the separation performance of the porous membrane for light gases based on the abundance. It should be understood that the detection component may also include a computing device, which can calculate the measurement results based on the abundance of different components of the gas in the sample to obtain the separation performance of the porous membrane for light gases.

[0082] Optionally, a method for determining the light gas separation performance of a porous membrane includes pretreating the system for determining the separation performance before using a separator to separate the light gas.

[0083] Optionally, the pretreatment of the separation performance measurement system includes: evacuating the separation performance measurement system to achieve a preset vacuum level.

[0084] Specifically, such as Figure 2 As shown, evacuating the system for measuring separation performance may include using a vacuum pump 70 to remove impurity gases from the system.

[0085] Understandably, before the light gas is injected into the system, there are other gases present in the system that are different from the light gas; these gases are impurity gases. The vacuum pump 70 can remove the impurity gases in the system to reduce the interference of the impurity gases on the separation performance test of the porous membrane 104, and the vacuum pump can create a vacuum environment.

[0086] Furthermore, the light gas can be configured as a molecular flow state. It's important to understand that the system is created by evacuating gas using a vacuum pump 70, resulting in a vacuum environment. When the light gas is injected into the system, it can be in a molecular flow state. In this state, the mean free path of the gas molecules is much larger than the pore size of the porous membrane 104, which improves the separation efficiency of the porous membrane 104 for the light gas.

[0087] It is understandable that, such as Figure 2 As shown, the system may also include a shut-off valve 80, which can be used to connect the input and output of the separator when impurity gas is extracted via vacuum pump 70, and to close the shut-off valve 80 when light gas is separated.

[0088] When the vacuum pump 70 extracts impurity gases from the system, the shut-off valve 80 can open, allowing the input and output ends of the separator to be connected. When the vacuum pump 70 is operating, gas on both sides of the porous membrane 104 within the separator can be extracted, preventing a large pressure difference from forming across the membrane and reducing the risk of damage to the membrane. Furthermore, when the vacuum pump 70 stops operating, the shut-off valve 80 closes.

[0089] Optionally, the pretreatment of the separation performance measurement system includes: adjusting the pressure ratio of the gas before and after passing through the separator to a preset pressure ratio, wherein the preset pressure ratio can be greater than or equal to 4. Specifically, such as... Figure 2 As shown, the pressure ratio of the light gas passing through the separator can be adjusted by setting the pressure regulating valve 90.

[0090] It is important to understand that this pressure ratio can be defined as the ratio of the pressure of the light gas before entering the separator to the pressure of the light distillate obtained after separation by the separator. During a single detection process, the pressure ratio remains constant.

[0091] The present application proposes a method that, by adjusting the pressure regulating valve 90, thereby changing the pressure ratio, can measure the separation performance of porous membranes for light gases at different pressure ratios.

[0092] Furthermore, by adjusting the valve opening of the pressure regulating valve 90, the pressure ratio within the system can be changed.

[0093] In some embodiments, the aforementioned preset pressure ratio can be greater than or equal to 4, and preferably, the preset pressure ratio can be 5. By setting this preset ratio, the separation effect of the porous membrane in the separator on light gases is improved.

[0094] In some embodiments, such as Figure 2 As shown. A compressor 40 can be installed at the input end of the separator to increase the pressure of the gas in the system, wherein the aforementioned gas includes light gas, heavy distillate gas, and light distillate gas, etc.

[0095] Compressor 40 can be a high-speed magnetic levitation gas compressor. It is understood that compressor 40 can be configured in multiple ways (e.g., 2-4).

[0096] By placing the compressor 40 at the input end of the separator, the gas can be compressed to a preset pressure range (e.g., 4 kPa to 13.3 kPa) before entering the separator.

[0097] Understandably, as gas circulates within the system, its pressure gradually decreases. By installing a compressor at the separator's input, the gas pressure can be increased, allowing the gas to pass smoothly through the separator. This compressor can also be used in conjunction with the pressure regulating valve 90 to adjust the pressure ratio. Furthermore, by installing a high-speed magnetic levitation gas compressor, the gas pressure within the system can be further increased.

[0098] In some embodiments, the high-speed magnetic levitation gas compressor in this application may be the high-speed magnetic levitation compressor mentioned in the patent application number "201821969158.X" and the utility model title "High-speed magnetic levitation compressor for negative pressure conditions". It should be understood that other compressors may also be used in this application.

[0099] In some embodiments, cooling components may be used to cool the separator assembly and compressor, etc.

[0100] In some embodiments, the system may further include a flow meter 50 for measuring the flow rate of gas within the system; and / or the system may further include a pressure gauge 60 for measuring the pressure of gas within the system.

[0101] It should be understood that the flow meter 50 can be connected to the input end, light distillate output end, and heavy distillate output end of the separator, thereby allowing the flow rate at different locations within the system to be read for easy recording. It should also be understood that when the system of this application is in operation, the flow rate remains essentially constant due to the formation of an internal circulation.

[0102] It should be understood that at least some aspects or features of the above-described implementation methods, embodiments, or examples can be appropriately combined.

[0103] In this application, unless otherwise expressly stated or limited, terms such as "installation," "assembly," "connection," "linking," "joining," "linking," "abutment," "communication," "connection," "conduction," "fixing," and "fastening" should be interpreted broadly, for example, they can be direct or indirect. For instance, regarding connection, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly stated or limited. For instance, regarding communication / conduction, it can be direct communication / conduction or indirect communication / conduction through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0104] It is understood that the accompanying drawings are mainly used to illustrate the connection or communication relationship of various components. For the purpose of simplicity and clarity, the location, length, etc. of each component, pipe, and pipeline are not restrictive and may differ from the actual situation. The presence of a pipe between two components in the accompanying drawings does not mean that they cannot be directly connected, and the direct connection between two components in the accompanying drawings does not mean that they cannot be indirectly connected via, for example, pipes.

[0105] It should be understood that the above-described embodiments, examples, or examples are merely exemplary and are not intended to limit this application. Those skilled in the art can make various modifications and changes to the above-described embodiments, examples, or examples under the teachings of this application without departing from the scope of this application.

Claims

1. A method for determining the light gas separation performance of a porous membrane in a separation performance determination system, characterized in that, The separation performance measurement system includes a separator assembly and a detection component. The separator assembly includes multiple separators, each containing a porous membrane (104). The multiple separators include an intermediate separator (10) and an edge separator (20). One edge separator (20) forms a light distillation gas outlet, and another edge separator (20) forms a heavy distillation gas outlet. The detection component is connected to the separator assembly. The method for determining the light gas separation performance of porous membranes includes: The light gas is separated using a separator to obtain light distillate gas and heavy distillate gas, wherein the average mass number of the light distillate gas is less than the average mass number of the heavy distillate gas; The light distillate gas and the heavy distillate gas are circulated within the separation performance testing system to ensure that the light distillate gas and the heavy distillate gas are separated multiple times within the system. After a preset time, the separation performance of the porous membrane for the light gas is obtained by a detection component.

2. The method for determining the light gas separation performance of a porous membrane according to claim 1, characterized in that, The step of internally circulating the light distillate gas and the heavy distillate gas within the separation performance measurement system includes: The light distillate gas separated by one of the separators adjacent to the intermediate separator (10) flows into the intermediate separator (10), and the heavy distillate gas separated by the other separator adjacent to the intermediate separator (10) flows into the intermediate separator (10). The recalcified gas separated by the edge separator (20) on the recalcified gas outlet side flows into the edge separator (20) on the recalcified gas outlet side. The light distillate gas separated by the edge separator (20) on the light distillate gas outlet side flows into the edge separator (20) on the light distillate gas outlet side.

3. The method for determining the light gas separation performance of a porous membrane according to claim 1, characterized in that, The method for determining the light gas separation performance of porous membranes includes: The separation performance measurement system is pretreated before using a separator to separate the light gas.

4. The method for determining the light gas separation performance of a porous membrane according to claim 3, characterized in that, The pretreatment of the system for measuring separation performance includes: The separation performance measurement system is evacuated to achieve a preset vacuum level.

5. The method for determining the light gas separation performance of a porous membrane according to claim 3, characterized in that, The pretreatment of the system for measuring separation performance includes: The pressure ratio of the gas before and after passing through the separator is adjusted to a preset pressure ratio, wherein the preset pressure ratio is greater than or equal to 4.

6. The method for determining the light gas separation performance of a porous membrane according to claim 1, characterized in that, The separation performance of the porous membrane for the light gas obtained by the detection component includes: Samples were taken at different locations within the separation performance measurement system to obtain sample data; Based on the sample data, the abundance of different components of the gas in the separation performance measurement system is obtained; Based on the abundance, the separation performance of the porous membrane for the light gas was calculated.

7. The method for determining the light gas separation performance of a porous membrane according to claim 6, characterized in that, Based on the sample data, the abundance of different components of the gas in the system for measuring separation performance is obtained by performing abundance analysis or mass spectrometry analysis on the sample data.

8. The method for determining the light gas separation performance of a porous membrane according to claim 1, characterized in that, The separator assembly has a feed end (105), and the feed end (10) of the intermediate separator (10) constitutes the feed end (105).

9. The method for determining the light gas separation performance of a porous membrane according to any one of claims 1-8, characterized in that, The separator contains multiple porous membranes connected in parallel.

10. The method for determining the light gas separation performance of a porous membrane according to any one of claims 1-8, characterized in that, The pore size of the porous membrane is less than 100 nm.

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