Two-component gas competitive adsorption isotherm splitting method

Abstract

The present application relates to the technical field of gas adsorption, and particularly provides a two-component gas competitive adsorption isotherm splitting method, aiming to solve the problem of high cost caused by mass flow meter + mass spectrometer or chromatography in the existing two-component gas competitive adsorption isotherm splitting. To this end, the two-component gas competitive adsorption isotherm splitting method comprises: controlling a weighing device to obtain the weight change of a sample after adsorption and the weight change of a sinker; obtaining the mass density of the mixed gas after adsorption based on the weight change; then obtaining the amount of substance of each of the mixed gas after adsorption; obtaining the residual amount of substance of each of the mixed gas after adsorption based on the amount of substance of the mixed gas after adsorption and the proportion of the amount of substance of each of the two-component gas after adsorption; further obtaining the proportion of the amount of adsorbed substance of each; and finally obtaining the adsorption mass of each based on the proportion of the amount of adsorbed substance of each of the two-component gas and the weight change Δm0 of the sample before and after adsorption.

Description

Technical Field

[0001] This invention relates to the field of gas adsorption technology, specifically providing a method for separating two-component gas competitive adsorption isotherms. Background Technology

[0002] In the field of adsorption instruments, particularly in gas adsorption analysis, catalyst research, gas storage material development, and industrial adsorption separation processes, accurately determining the competitive adsorption behavior of multi-component gases on adsorbents is of paramount scientific and engineering value. Obtaining precise two-component competitive adsorption isotherms is a core step in gaining a deeper understanding of adsorption mechanisms, screening for highly efficient adsorbents, and optimizing process parameters.

[0003] Currently, conventional methods for determining competitive adsorption isotherms in this field mainly rely on a coupled system of mass flow meter (MFC) and mass spectrometer (MS) or chromatograph (GC). In this scheme, the mass flow meter is used to precisely control the inlet flow rate of different components to prepare a mixed gas in a specific ratio. Subsequently, the mixed gas flows through a reactor containing an adsorbent sample, and the outflow gas is analyzed in real time using a mass spectrometer or chromatograph placed at the reactor outlet. By comparing the changes in component concentrations in the inlet and outlet gases, combined with the gas flow rate data, the adsorption amount and proportion of each component on the adsorbent are finally calculated.

[0004] However, this existing technology has significant limitations. First, both mass spectrometers and chromatographs are high-precision and expensive analytical instruments, with high purchase and maintenance costs, resulting in a high overall cost for the testing system and limiting its widespread application. Second, the operation of such coupled systems is relatively complex, requiring high levels of professional skills from operators, and the data analysis process is cumbersome. Furthermore, the connection and synchronization of multiple components in the entire system may introduce potential error propagation, affecting the accuracy of the final data. Therefore, the industry urgently needs to develop a new, low-cost, and highly reliable method that can achieve accurate separation of two components by competitive adsorption isotherms without relying on expensive spectroscopic detection equipment.

[0005] In view of this, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0006] The present invention aims to solve the above-mentioned technical problems, namely, to solve the problem that the existing method of separating two-component gas competitive adsorption isotherms by mass flow meter + mass spectrometry or chromatography is too costly.

[0007] In a first aspect, the present invention provides a method for separating a two-component gas competitive adsorption isotherm, comprising: an intake system for mixing two-component gases; a weighing device including an adsorption chamber, the adsorption chamber being connected to the intake system via an intake pipe and an exhaust pipe, the intake pipe and the exhaust pipe being respectively provided with an intake valve and an exhaust valve, the weighing device including a first measuring position for weighing a sample and a second measuring position for weighing a sedimentation plate; the method for separating a two-component gas competitive adsorption isotherm includes: controlling the weighing device to obtain the initial weight of the sample and the weight of the sedimentation plate; controlling the intake valve and the exhaust valve to open so that the mixed gas in the intake system adsorbs the sample; controlling the weighing device to obtain the weight of the sample after adsorption and The weight of the settling plate; the weight change Δm0 of the sample before and after adsorption and the weight change Δm1 of the settling plate; the mass density ρ of the mixed gas after adsorption based on the weight change Δm1 of the settling plate; the molar percentage of each component of the mixed gas after adsorption based on the mass density ρ of the mixed gas after adsorption; the amount of matter in the mixed gas after adsorption and the amount of matter remaining in each component gas after adsorption based on the amount of matter in the mixed gas after adsorption and the molar percentage of each component gas after adsorption; the molar percentage of adsorbed matter in each component gas based on the amount of gas introduced and the amount of remaining matter; and the adsorption mass of each component gas based on the molar percentage of adsorbed matter in each component gas and the weight change Δm0 of the sample before and after adsorption.

[0008] In a preferred embodiment of the above-mentioned two-component gas competitive adsorption isotherm splitting method, the step "obtaining the mass density ρ of the adsorbed mixed gas based on the weight change Δm1 of the sedimentation plate" further includes: obtaining the volume V1 of the sedimentation plate; and obtaining the mass density ρ of the adsorbed mixed gas based on the formula Δm1g=ρgV1, where g is the gravitational acceleration.

[0009] In a preferred embodiment of the above-described method for separating isotherms from two-component gas competitive adsorption, a temperature acquisition device and a pressure acquisition device are further included, used to acquire the temperature and pressure within the system, respectively. The step of "acquiring the molar percentage of each gas in the adsorbed mixture based on the mass density ρ of the adsorbed mixture" further includes: controlling the temperature acquisition device and the pressure acquisition device to acquire the temperature and pressure within the system after adsorption, respectively; and acquiring the molar density c of each gas in the adsorbed mixture based on the temperature and pressure within the system after adsorption. m1 c m2 Based on the molar density c of each of the adsorbed mixed gases m1 c m2 The mass density ρ of the adsorbed mixed gas is used to obtain the molar percentages X and Y of the two components of the gas after adsorption.

[0010] In a preferred embodiment of the above-described method for separating the isotherms of competing adsorption of two components of gas, the step "obtaining the amount of substance of the adsorbed mixed gas and obtaining the amount of remaining substance of each component of the adsorbed mixed gas based on the amount of substance of the adsorbed mixed gas and the proportion of the amount of substance of each component gas after adsorption" further includes: obtaining the total volume V2 of the adsorbed mixed gas; and obtaining the molar density c of the adsorbed mixed gas based on the temperature and pressure within the system after adsorption. n Based on the molar density c of the adsorbed gas mixture n The total volume V2 of the mixed gas after adsorption is obtained through the formula c. n =n / V2 to obtain the amount of substance n of the adsorbed mixed gas; based on the amount of substance n of the adsorbed mixed gas and the proportion of each of the two components X and Y after adsorption, obtain the remaining amounts n1 and n2 of the adsorbed mixed gas.

[0011] In a preferred embodiment of the above-described two-component gas competitive adsorption isotherm separation method, the step "based on the molar density c of each of the adsorbed mixed gases" is... m1 c m2 The mass density ρ of the adsorbed mixed gas is used to obtain the molar percentages X and Y of the two components of the gas after adsorption. This further includes: based on the formula X×c... m1 +Y×c m2 =ρ / (M1×X+M2×Y) and the formula X+Y=1, obtain the molar percentages X and Y of the two-component gases after adsorption, where M1 and M2 are the mass constants of the two-component gases.

[0012] In a preferred embodiment of the above-mentioned method for separating the competitive adsorption isotherms of two-component gases, the step "obtaining the remaining amounts n1 and n2 of the two-component gases after adsorption based on the amount n of the adsorbed mixed gas and the proportions X and Y of the amount of each of the two-component gases after adsorption" further includes: obtaining the remaining amounts n1 and n2 of the two-component gases after adsorption based on the formulas n1=n×X and n2=n×Y.

[0013] In a preferred embodiment of the above-mentioned method for separating the competitive adsorption isotherms of two-component gases, the step "obtaining the proportion of adsorbed substances based on the amount of gas introduced and the amount of remaining substances of each of the two-component gases" further includes: obtaining the amounts of gas introduced n3 and n4 of each of the two-component gases; obtaining the amounts of adsorbed substances n5 and n6 of each of the two-component gases using the formulas n5=n3-n1 and n6=n4-n2; and obtaining the proportions P and Q of adsorbed substances of each of the two-component gases using the formulas P=n5 / (n5+n6) and Q=n6 / (n5+n6).

[0014] In a preferred embodiment of the above-mentioned method for separating the competitive adsorption isotherms of two-component gases, the step "obtaining the adsorption mass of each component gas based on the proportion of adsorbed substances in each component gas and the weight change Δm0 of the sample before and after adsorption" further includes: obtaining the adsorption mass proportion of each component gas based on the proportion of adsorbed substances in each component gas; and obtaining the adsorption mass of each component gas based on the adsorption mass proportion of each component gas and the weight change Δm0 of the sample before and after adsorption.

[0015] In a preferred embodiment of the above-mentioned method for splitting the competitive adsorption isotherms of two-component gases, the step "obtaining the adsorption mass ratio of each of the two-component gases based on the molar ratio of the adsorbed substances of each of the two-component gases" further includes: obtaining the adsorption mass ratios E and F of each of the two-component gases using the formulas E=P×M1 / (P×M1+Q×M2) and F=Q×M2 / (P×M1+Q×M2), where M1 and M2 are the mass constants of the two-component gases, respectively.

[0016] In a preferred embodiment of the above-mentioned method for separating two-component gas competitive adsorption isotherms, the step "obtaining the adsorption mass of each component gas based on its respective adsorption mass ratio and the weight change Δm0 of the sample before and after adsorption" further includes: obtaining the adsorption masses A and B of the two-component gases using the formulas A=Δm0×E and B=Δm0×F.

[0017] When employing the above technical solution, the two-component gas competitive adsorption isotherm separation method of the present invention can obtain the weight change of the sample before and after adsorption using a weighing device. It can also obtain the weight change of the sedimentation plate caused by the change in gas density before and after adsorption, resulting in a change in gas buoyancy. Based on the weight change of the sedimentation plate, the buoyancy change caused by the density change after gas adsorption can be calculated. The mass density of the adsorbed mixed gas can be calculated using the gas buoyancy formula. When the temperature and pressure within the system are known, the molar density of each gas in the two-component mixed gas can be obtained using a formula. Combining the gas buoyancy and the molar density of each gas, the molar percentage of each gas in the adsorbed mixed gas can be calculated using a formula. When the temperature, pressure, and the molar percentage of each gas in the adsorbed mixed gas are known, the molar density of the adsorbed mixed gas can be found, and the total amount of matter and the amount of matter of each gas in the adsorbed mixed gas can be obtained using a formula. Based on this, given the amount of each gas introduced into the system and the amount of remaining gas, the amount of substance adsorbed by the sample and the proportion of adsorbed substance can be calculated. After converting the proportion of adsorbed substance into the proportion of adsorbed mass using a formula, and combining this with the change in sample mass (i.e., adsorbed mass), the adsorbed mass of each gas can be calculated. This invention avoids the use of mass flow meters, mass spectrometers, and chromatographs, achieving the separation of the competitive adsorption isotherms of two-component gases while significantly reducing the hardware cost and subsequent maintenance expenses of the entire testing system. Attached Figure Description

[0018] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0019] Figure 1 This is a schematic diagram of the air intake system and weighing device;

[0020] Figure 2 This is a flowchart of the main process of the two-component gas competitive adsorption isotherm splitting method of the present invention;

[0021] Figure 3 This is a detailed flowchart of step S5;

[0022] Figure 4 This is a detailed flowchart of step S6;

[0023] Figure 5 This is a detailed flowchart of step S7;

[0024] Figure 6 This is a detailed flowchart of step S8;

[0025] Figure 7 This is a detailed flowchart of step S9.

[0026] List of reference numerals in the attached diagram:

[0027] 1. Air intake system; 2. Weighing device; 21. Adsorption chamber; 22. Air intake pipe; 221. Air intake valve; 23. Exhaust pipe; 231. Exhaust valve; 24. First measuring position; 25. Second measuring position. Detailed Implementation

[0028] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the invention and are not intended to limit the scope of protection of the invention. Those skilled in the art can make adjustments as needed to adapt to specific applications.

[0029] This paper first introduces existing methods for separating two-component gas competitive adsorption isotherms. Currently, the conventional method for determining competitive adsorption isotherms in this field mainly relies on a coupled system of a mass flow meter (MFC) and a mass spectrometer (MS) or chromatograph (GC). In this scheme, the mass flow meter is used to precisely control the inlet flow rate of different components to prepare a mixed gas in a specific ratio. Subsequently, the mixed gas flows through a reactor containing an adsorbent sample, and the outflow gas is analyzed in real time online using a mass spectrometer or chromatograph placed at the reactor outlet. By comparing the changes in component concentrations in the inlet and outlet gases, combined with the gas flow rate data, the adsorption amount and proportion of each component on the adsorbent are finally calculated. However, this existing technical solution has significant limitations. First, mass spectrometers and chromatographs are both high-precision and expensive analytical equipment, and their purchase and maintenance costs are high, resulting in a high cost for the entire testing system and limiting the widespread application of this technology. Second, the operation process of such coupled systems is relatively complex, requiring high professional skills from operators, and the data analysis process is cumbersome. Furthermore, the entire system involves the connection and synchronization of multiple components, which may lead to potential error propagation and affect the accuracy of the final data. Therefore, the industry urgently needs to develop a low-cost, highly reliable new method to achieve accurate separation of two-component competitive adsorption isotherms without relying on expensive spectroscopic detection equipment. The following implementation method is proposed for this purpose.

[0030] like Figures 1-7 As shown, to address the problem of excessively high costs associated with existing methods for separating two-component gas competitive adsorption isotherms using mass flow meters + mass spectrometry or chromatography, this invention provides a method for separating two-component gas competitive adsorption isotherms, comprising:

[0031] The intake system 1 is used to mix the two-component gases and can be any intake system 1 used to achieve competitive adsorption mixing of the two-component gases.

[0032] The weighing device 2 includes an adsorption chamber 21, which is connected to the air intake system 1 through an air intake pipe 22 and an exhaust pipe 23. An air intake valve 221 and an exhaust valve 231 are respectively provided on the air intake pipe 22 and the exhaust pipe 23. The weighing device 2 includes a first measuring position 24 for weighing the sample and a second measuring position 25 for weighing the sedimentation plate. The weighing device 2 can be a magnetic levitation balance or other common weighing devices 2 used for high-pressure gas adsorption. The present invention does not make any specific limitations on this.

[0033] Methods for resolving two-component gas competitive adsorption isotherms include:

[0034] S1. Control the weighing device 2 to obtain the initial weight of the sample and the weight of the sedimentation plate;

[0035] S2. Control the opening of the inlet valve 221 and the exhaust valve 231 so that the mixed gas in the inlet system 1 adsorbs the sample;

[0036] S3. Control the weighing device 2 to obtain the weight of the sample after adsorption and the weight of the sedimentation plate;

[0037] S4. Obtain the weight change Δm0 of the sample before and after adsorption and the weight change Δm1 of the sedimentation plate;

[0038] S5. Obtain the mass density ρ of the mixed gas after adsorption based on the weight change Δm1 of the sedimentation plate.

[0039] S6. Obtain the molar percentage of each substance in the adsorbed mixed gas based on the mass density ρ of the adsorbed mixed gas.

[0040] S7. Obtain the amount of substance of the adsorbed mixed gas and obtain the amount of remaining substance of each component gas after adsorption based on the amount of substance of the adsorbed mixed gas and the proportion of the amount of substance of each component gas after adsorption.

[0041] S8. Obtain the proportion of adsorbed substances based on the amount of each gas fed into the two-component gas and the amount of the remaining gas.

[0042] S9. Obtain the adsorption mass of each component gas based on the proportion of adsorbed substances in each component gas and the weight change Δm0 of the sample before and after adsorption.

[0043] Of the above steps, step S5 further includes:

[0044] S51. Obtain the volume V1 of the settling plate;

[0045] S52. Obtain the mass density ρ of the adsorbed mixed gas based on the formula Δm1g=ρgV1, where g is the gravitational acceleration.

[0046] It also includes a temperature acquisition device and a pressure acquisition device, used to acquire the temperature and pressure within the system, respectively. Step S6 further includes:

[0047] S61. The temperature acquisition device and the pressure acquisition device are controlled to acquire the temperature and pressure in the system after adsorption, respectively.

[0048] S62. Obtain the molar density c of the adsorbed mixed gas based on the temperature and pressure within the system after adsorption. m1 c m2 ;

[0049] S63, Based on the molar density c of the individual gases after adsorption m1 c m2 The mass density ρ of the adsorbed mixed gas is used to obtain the molar percentages X and Y of the two components of the gas after adsorption.

[0050] Step S63 further includes:

[0051] S631, Based on the formula X×c m1 +Y×c m2 =ρ / (M1×X+M2×Y) and the formula X+Y=1, obtain the molar percentages X and Y of the two-component gases after adsorption, where M1 and M2 are the mass constants of the two-component gases.

[0052] Step S7 further includes:

[0053] S71. Obtain the total volume V2 of the mixed gas after adsorption;

[0054] S72. Obtain the molar density c of the adsorbed gas mixture based on the temperature and pressure within the system after adsorption. n ;

[0055] S73, Based on the molar density c of the adsorbed mixed gas n The total volume V2 of the mixed gas after adsorption is obtained through the formula c. n =n / V2 to obtain the amount of substance n of the mixed gas after adsorption;

[0056] S74. Based on the amount of substance n of the adsorbed mixed gas and the proportion of each of the adsorbed two-component gases X and Y, obtain the remaining amounts n1 and n2 of each of the adsorbed mixed gas.

[0057] Step S74 further includes:

[0058] S741. Based on the formulas n1=n×X and n2=n×Y, obtain the amounts of residual substances n1 and n2 of the mixed gas after adsorption.

[0059] Step S8 further includes:

[0060] S81. Obtain the amounts of the gas introduced into each of the two components, n3 and n4;

[0061] S82. Obtain the amounts of adsorbed substances n5 and n6 of the two-component gas using the formulas n5=n3-n1 and n6=n4-n2.

[0062] S83. Obtain the proportions of adsorbed substances P and Q for each component gas using the formulas P=n5 / (n5+n6) and Q=n6 / (n5+n6).

[0063] Step S9 further includes:

[0064] S91. Obtain the adsorption mass percentage of each component gas based on the amount percentage of each adsorbed substance in the two-component gas.

[0065] S92. The adsorption mass of each component gas is obtained based on its respective adsorption mass ratio and the weight change Δm0 of the sample before and after adsorption.

[0066] Of the above steps, step S91 further includes:

[0067] S911. Obtain the adsorption mass ratios E and F of the two-component gases using the formulas E=P×M1 / (P×M1+Q×M2) and F=Q×M2 / (P×M1+Q×M2), where M1 and M2 are the mass constants of the two-component gases, respectively.

[0068] Step S92 further includes:

[0069] S921. Obtain the adsorption masses A and B of the binary gas using the formulas A=Δm0×E and B=Δm0×F.

[0070] In the above-described implementation, in the initial stage, the two-component gas has already been mixed in the intake system 1 and has not yet been introduced into the weighing device 2. The weighing device 2 is controlled to obtain the initial weight of the sample and the weight of the settling plate. The settling plate is used as a standard component, and its weight can also be obtained by prior measurement or other means. Then, the intake valve 221 and exhaust valve 231 are opened to allow the mixed gas in the intake system 1 to enter the adsorption chamber 21 of the weighing device 2 to adsorb the sample. The adsorption is completed after the preset time. At this time, the weighing device 2 is controlled to obtain the weight of the sample after adsorption and the weight of the sedimentation plate, and the weight change of the sample before and after adsorption Δm0 and the weight change of the sedimentation plate Δm1 are calculated. The mass change of the sample is due to the adsorption of the two-component gas, and the weight change of the sedimentation plate is due to the change in density of the two-component mixed gas (usually a decrease) after the two-component gas in the adsorption chamber 21 is adsorbed by the sample. The sedimentation plate does not adsorb any gas, but it is significantly affected by the change in gas density. Therefore, the change in buoyancy caused by the change in density of the two-component mixed gas before and after adsorption can be well shown by the sedimentation plate. That is, the weight change of the sedimentation plate before and after adsorption is actually the change in buoyancy of the two-component mixed gas. Based on this, the volume V1 of the settling plate is first obtained. Then, using the gas buoyancy formula F=ρgV, the formula Δm1g=ρgV1 is obtained, where the volume V1 of the settling plate is equal to the volume of the displaced gas, the buoyancy F=Δm1g is the change in weight of the settling plate, and ρ is the mass density of the mixed gas after adsorption (g / cm³). 3 (where g is the acceleration due to gravity). Since Δm1 and V1 are known in the formula, the mass density ρ of the adsorbed gas mixture can be obtained. Next, we will explain how to obtain the molar percentage of each substance in the adsorbed gas mixture.

[0071] The temperature and pressure acquisition devices respectively acquire the temperature and pressure within the system after adsorption. Based on the temperature and pressure within the system after adsorption, the molar density c of each gas in the adsorbed mixture can be found by looking up a table. m1 c m2 (mol / cm) 3 Based on the molar density c of each of the adsorbed mixed gases m1 c m2 By considering the mass density ρ of the adsorbed mixed gas, we can obtain the molar percentages X and Y of each component gas after adsorption. Specifically, this is based on the formula X×c. m1 +Y×c m2 The equations ρ / (M1×X+M2×Y) and X+Y=1, when combined, give the molar percentages X and Y of the two components of the gas after adsorption. M1 and M2 are the mass constants (g / mol) of the two components, respectively. The left side of the equation in the first formula represents the sum of the molar densities (mol / cm³) of the two components after adsorption. 3The right side of the equation is the conversion formula between mass density and molar density [(g / cm³)]. 3 The second formula, [x, y], indicates that the sum of the molar percentages of the two gas components after adsorption equals 1, thus yielding the molar percentages X and Y of the two gas components after adsorption. Next, we will explain how to obtain the remaining amount of each gas component after adsorption.

[0072] First, obtain the total volume V2 of the adsorbed gas mixture. V2 is the total volume of the container holding the gas, which can be obtained by consulting equipment datasheets or through actual measurement. Then, based on the temperature and pressure within the system after adsorption, look up the molar density c of the adsorbed gas mixture in a table. n Based on the molar density c of the adsorbed mixed gas n The total volume V2 of the mixed gas after adsorption is obtained through the formula c. n The amount of substance n of the adsorbed mixed gas is calculated by n / V2. Based on the amount of substance n of the adsorbed mixed gas and the proportions X and Y of the respective amounts of the two components after adsorption, the amounts of the remaining substances n1 and n2 of the adsorbed mixed gas are obtained. Specifically, the amounts of the remaining substances n1 and n2 of the adsorbed mixed gas are obtained by the formulas n1=n×X and n2=n×Y.

[0073] Before gas mixing begins, the amounts of each of the two components of the gas introduced into the system are known. Therefore, the amounts of the introduced substances, n3 and n4, are obtained. Then, the amounts of adsorbed substances, n5 and n6, are obtained using the formulas n5 = n3 - n1 and n6 = n4 - n2, respectively. This means the amount of introduced substances minus the amount of remaining substances yields the amount of adsorbed substances. The proportions of adsorbed substances, P and Q, for each component are obtained using the formulas P = n5 / (n5 + n6) and Q = n6 / (n5 + n6). Based on these proportions, the adsorbed mass proportions of each component are obtained. Specifically, the adsorbed mass proportions, E and F, are obtained using the formulas E = P × M1 / (P × M1 + Q × M2) and F = Q × M2 / (P × M1 + Q × M2), where M1 and M2 are the mass constants of the two components (obtainable from tables). Finally, the adsorption mass of each component gas is obtained based on its respective adsorption mass ratio and the weight change Δm0 of the sample before and after adsorption. Specifically, the adsorption masses A and B of the two components gas are obtained using the formulas A = Δm0 × E and B = Δm0 × F. This completes the splitting of the competitive adsorption isotherm of the two components gas.

[0074] The two-component gas competitive adsorption isotherm separation method proposed in this invention has achieved significant technological progress and beneficial effects compared with the prior art, specifically reflected in the following aspects.

[0075] First, it significantly reduces system cost and complexity.

[0076] Existing technologies rely on the combined use of mass flow meters and mass spectrometers or chromatographs, resulting in high costs for the purchase and maintenance of core detection equipment. This invention completely eliminates expensive spectroscopic detection components, requiring only a weighing device 2 with dual measurement positions (such as a magnetic levitation balance), combined with temperature and pressure sensors and a sedimentation plate of known volume. This invention significantly reduces the hardware cost and subsequent maintenance expenses of the entire testing system, simplifies the system structure, lowers the operational threshold, and facilitates the promotion and application of this technology in a wider range of fields.

[0077] Second, innovative physical measurement methods ensured data reliability.

[0078] The core technological advantage of this invention lies in its indirect measurement of gas components using the principle of buoyancy. By monitoring the weight change of a sedimentation plate that does not adsorb gas before and after adsorption, and combining this with Archimedes' principle, the mass density of the mixed gas after adsorption equilibrium can be accurately calculated. This method is an in-situ, real-time physical measurement, avoiding the component distortion or delay problems that may arise from sampling and transportation in traditional chromatography / mass spectrometry methods. The data source is direct and reliable. The entire calculation process is based on rigorous thermodynamic formulas and physical laws. All key parameters (total adsorption amount, gas density, temperature, and pressure) are obtained from high-precision measurements in the same experiment, ensuring the internal consistency of the data chain and the accuracy of the results.

[0079] Third, it achieves high-precision isotherm splitting.

[0080] Based on the measured mass density of the mixed gas, the known temperature and pressure of the system, and by querying the pure component property database and solving the simultaneous equations, the molar proportions of the two-component gases can be accurately determined. Furthermore, by combining the known gas input rate and the calculated remaining gas quantity, the adsorption capacity and proportion of each component can be accurately obtained, ultimately achieving a high-precision separation of the total adsorption capacity. This method has a solid theoretical foundation and rigorous logic, effectively meeting the accuracy requirements for competing adsorption isotherm data in scientific research and engineering applications.

[0081] In summary, this invention successfully provides a low-cost, highly reliable, and accurate two-component gas competitive adsorption isotherm separation scheme, effectively solving the core problems of high cost, system complexity, and cumbersome operation caused by reliance on expensive detection equipment in the background technology.

[0082] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A method for resolving a two-component gas competitive adsorption isotherm, characterized in that, include: The intake system (1) is used to mix the two-component gases; The weighing device (2) includes an adsorption chamber (21), which is connected to the air intake system (1) through an air intake pipe (22) and an exhaust pipe (23). An air intake valve (221) and an exhaust valve (231) are respectively provided on the air intake pipe (22) and the exhaust pipe (23). The weighing device (2) includes a first measuring position (24) for weighing the sample and a second measuring position (25) for weighing the sedimentation plate. The method for separating the two-component gas competitive adsorption isotherm includes: Control the weighing device (2) to obtain the initial weight of the sample and the weight of the sedimentation plate; The intake valve (221) and the exhaust valve (231) are opened to allow the mixed gas in the intake system (1) to adsorb the sample; Control the weighing device (2) to obtain the weight of the sample after adsorption and the weight of the sedimentation plate; The weight change Δm0 of the sample before and after adsorption and the weight change Δm1 of the sedimentation sheet were obtained. The mass density ρ of the adsorbed mixed gas is obtained based on the weight change Δm1 of the settling plate. The mass density ρ of the adsorbed mixed gas is used to obtain the molar percentage of each substance in the adsorbed mixed gas. The amount of substance of the adsorbed mixed gas is obtained, and the amount of remaining substance of each component gas after adsorption is obtained based on the amount of substance of the adsorbed mixed gas and the proportion of the amount of substance of each component gas after adsorption. The proportion of adsorbed substances in each component gas is obtained based on the amount of gas introduced and the amount of residual gas in each component gas. The adsorption mass of each component gas is obtained based on the proportion of adsorbed substances in each component and the weight change Δm0 of the sample before and after adsorption.

2. The method for separating the two-component gas competitive adsorption isotherm according to claim 1, characterized in that, The step "obtaining the mass density ρ of the adsorbed mixed gas based on the weight change Δm1 of the settling sheet" further includes: Obtain the volume V1 of the settling plate; The mass density ρ of the adsorbed mixed gas is obtained based on the formula Δm1g=ρgV1, where g is the acceleration due to gravity.

3. The method for separating the two-component gas competitive adsorption isotherm according to claim 1, characterized in that, It also includes a temperature acquisition device and a pressure acquisition device, used to acquire the temperature and pressure within the system, respectively. The step "acquiring the molar percentage of each substance in the adsorbed mixed gas based on the mass density ρ of the adsorbed mixed gas" further includes: The temperature acquisition device and the pressure acquisition device are controlled to acquire the temperature and pressure within the system after adsorption, respectively. The molar density c of the adsorbed mixed gas is obtained based on the temperature and pressure within the system after adsorption. m1 c m2 ; Based on the molar density c of the respective gases after adsorption m1 c m2 The mass density ρ of the adsorbed mixed gas is used to obtain the molar percentages X and Y of the two components of the gas after adsorption.

4. The method for separating the two-component gas competitive adsorption isotherm according to claim 3, characterized in that, The step "obtaining the amount of substance of the adsorbed mixed gas and obtaining the amount of remaining substance of each component gas after adsorption based on the amount of substance of the adsorbed mixed gas and the respective amount of substance of the adsorbed binary gas" further includes: Obtain the total volume V2 of the mixed gas after adsorption; The molar density c of the adsorbed gas mixture is obtained based on the temperature and pressure within the system after adsorption. n ; Based on the molar density c of the adsorbed mixed gas n The total volume V2 of the mixed gas after adsorption is obtained through the formula c. n =n / V2 to obtain the amount of substance n of the mixed gas after adsorption; The remaining amounts n1 and n2 of the adsorbed mixed gas are obtained based on the amount of substance n of the adsorbed mixed gas and the proportions X and Y of the amount of substance of each of the two components after adsorption.

5. The method for separating the two-component gas competitive adsorption isotherm according to claim 3, characterized in that, Step "Based on the molar density c of each of the adsorbed mixed gases" m1 c m2 The mass density ρ of the adsorbed mixed gas, and the molar percentages X and Y of the two components of the gas after adsorption, further include: Based on the formula X×c m1 +Y×c m2 =ρ / (M1×X+M2×Y) and the formula X+Y=1, obtain the molar percentages X and Y of the two-component gases after adsorption, where M1 and M2 are the mass constants of the two-component gases.

6. The method for separating the two-component gas competitive adsorption isotherm according to claim 4, characterized in that, The step "obtaining the remaining amounts n1 and n2 of each component gas after adsorption based on the amount n of the adsorbed mixed gas and the respective amount X and Y of the adsorbed binary gas" further includes: The amounts of residual substances n1 and n2 in the adsorbed mixed gas are obtained using the formulas n1=n×X and n2=n×Y.

7. The method for separating the two-component gas competitive adsorption isotherm according to claim 1, characterized in that, The step "obtaining the proportion of adsorbed substances based on the amount of each gas fed into and the amount of remaining substances in the two-component gases" further includes: Obtain the amounts of the gas introduced into the binary gas, n3 and n4. The amounts of adsorbed substances n5 and n6 for each component gas are obtained using the formulas n5=n3-n1 and n6=n4-n2. The proportions of adsorbed substances in each of the two-component gases, P and Q, can be obtained using the formulas P=n5 / (n5+n6) and Q=n6 / (n5+n6).

8. The method for separating the two-component gas competitive adsorption isotherm according to claim 1, characterized in that, The step "obtaining the adsorption mass of each component gas based on the molar ratio of the adsorbed substances and the weight change Δm0 of the sample before and after adsorption" further includes: The adsorption mass percentage of each component gas is obtained based on the amount percentage of adsorbed substances in each component gas. The adsorption mass of each component gas was obtained based on its respective adsorption mass percentage and the weight change Δm0 of the sample before and after adsorption.

9. The method for separating the two-component gas competitive adsorption isotherm according to claim 8, characterized in that, The step "obtaining the adsorption mass percentage of each component gas based on the molar percentage of the adsorbed substances of each component gas" further includes: The adsorption mass percentages E and F of the binary gas are obtained by formula E=P×M1 / (P×M1+Q×M2) and formula F=Q×M2 / (P×M1+Q×M2), where M1 and M2 are the mass constants of the binary gas.

10. The method for separating the two-component gas competitive adsorption isotherm according to claim 9, characterized in that, The step "obtaining the adsorption mass of each component gas based on its respective adsorption mass ratio and the weight change Δm0 of the sample before and after adsorption" further includes: The adsorption masses A and B of the binary gas can be obtained using the formulas A=Δm0×E and B=Δm0×F.

Images